Lubricant-Tight Vane Vacuum Pump Heat Dissipation
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Solution Overview
Problem
Vane rotary vacuum pumps experience lubricant overheating due to progressive heat generation, leading to chemical structure changes and reduced lubricant service life.
Innovation Solution
A channel branches from the hydraulic conduit to deliver pressurized lubricant into the lubricant reservoir, promoting lubricant displacement and heat transfer to other components, thereby preventing overheating. The lubricant pump is positioned between the motor and pump stage to reduce conduit length, and a lubricant flow resistance is introduced to manage lubricant flow, with a slide bearing for additional lubrication and simplified construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the pump stage housing is submerged in a lubricant reservoir for heat transmission, then heat dissipation is improved, but lubricant overheating occurs due to progressive heating and chemical structure changes
Solution Approach 1:
The invention extracts a portion of the heated lubricant from the reservoir through a pump and returns it to the reservoir after cooling, separating the heat dissipation function from the static lubricant body. This active circulation prevents progressive overheating while maintaining the heat transmission benefit of submersion.
Solution Approach 2:
The invention transforms the static lubricant reservoir into a dynamic system with active circulation. A pump continuously moves lubricant through the reservoir and back, creating flow patterns that enhance heat dissipation and prevent localized overheating that would occur in a static system.
2Ease of operation
If a lubricant pump is added to create pressurized flow for opening the safety valve, then valve control is improved, but device complexity increases
Solution Approach 1:
The lubricant pump serves multiple functions: it pressurizes lubricant to open the safety valve, circulates lubricant through the reservoir for heat dissipation, and maintains lubricant flow to the vane compression chamber. This multi-functionality reduces overall system complexity despite adding a pump component.
Solution Approach 2:
The invention combines the safety valve actuation system with the lubricant circulation system. The same pressurized lubricant flow that controls the safety valve also serves the heat dissipation function, merging two separate functions into one integrated system.
3Length of moving object
If the lubricant pump is positioned between the motor and pump stage to reduce conduit length, then hydraulic conduit length is reduced, but lubricant flow distribution to various components becomes more complex
Solution Approach 1:
The invention segments the lubricant distribution system into distinct flow paths: one path to the safety valve for valve control, another path through the reservoir for heat dissipation, and flow to the vane chamber for lubrication. This segmentation manages complexity by organizing flow distribution into clear, separate functions despite the compact pump positioning.
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 solution effectively prevents lubricant overheating by ensuring continuous lubricant circulation and heat exchange, extending its service life and simplifying the pump's construction while reducing costs.
Implementation Method 1
a lubricant pump having an inlet and an outlet, a lubricant reservoir at least partially surrounding the pump stage housing... a pressurized lubricant flow through the hydraulic conduit opening the safety valve
Implementation Method 2
The heat, which is generated within the pump stage housing, is transmitted to the lubricant surrounding the housing
Implementation Method 3
a safety valve for controlling gas flow to the pump stage housing, with a pressurized lubricant flow through the hydraulic conduit opening the safety valve
Data Source
AI summary
A lubricant-tight vane rotary vacuum pump includes at least one pump stage (17, 18) having a safety valve (3) for controlling gas flow to the pump stage, a lubricant pump, a lubricant reservoir (30) at least partially surrounding the pump stage housing (10, 40), and a hydraulic conduit (31) connecting the lubricant pump outlet (22) with the safety valve (3), with a pressurized lubricant flow through the hydraulic conduit (31) opening the safety valve (3), and a channel (32) branching from the hydraulic conduit (31) for delivering a pressurized lubricant into the lubricant reservoir (30).