Rotary Vane Vacuum Pump Motor Lubrication Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vacuum pumps, particularly single-stage rotary vane vacuum pumps, face issues with radial shaft seal wear, leading to lubricant loss and contamination risks due to dynamic sealing, which compromises operational reliability and vacuum quality.
Innovation Solution
The vacuum pump design eliminates the need for a radial shaft sealing ring by using a static seal and integrates the motor within a lubricant-filled compartment, allowing the engine compartment to act as a lubricant line for direct lubrication of components, thereby reducing wear and installation space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radial shaft sealing ring is used to seal the motor from the lubricant, then the motor is protected from lubricant contamination, but the seal wears out over time and loses its tightness
Solution Approach 1:
The patent removes the radial shaft sealing ring from the system entirely. Instead of using a seal to prevent lubricant contact with the motor, the design allows the motor to be directly exposed to the lubricant in the motor compartment, eliminating the wear-prone sealing element while maintaining operational reliability
Solution Approach 2:
The motor compartment serves dual functions: it houses the motor and simultaneously acts as a lubricant reservoir and distribution system. The lubricant in the motor compartment directly lubricates the rotor shaft and bearing elements, eliminating the need for separate sealing mechanisms
2Reliability
If a radial shaft sealing ring is installed, then the motor is sealed from the lubricant, but installation space is required for the seal and associated lines
Solution Approach 1:
The motor compartment is merged with the lubricant distribution system. The motor compartment serves as both the motor housing and the lubricant reservoir, eliminating the need for separate sealing components and associated installation space
Solution Approach 2:
The motor compartment performs multiple functions: housing the motor, storing lubricant, distributing lubricant to bearing elements, and serving as the lubricant return path. This multi-functionality eliminates the need for dedicated sealing components and reduces overall installation space requirements
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 enhances operational reliability by minimizing seal wear, ensuring consistent lubrication, and improving vacuum quality by eliminating virtual leaks and reducing contamination risks, while also simplifying production and installation.
Implementation Method 1
The pump body (24) can be supplied with lubricant from the engine compartment (38), in particular directly, through a bearing (58) into the pump chamber (28). The lubricant can preferably be supplied to the pump chamber (28)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Vacuum pump, in particular rotary vane vacuum pump, comprising: a pumping chamber (28) in which a gas to be pumped can be conveyed from an inlet (12) to an outlet (34) by means of a pumping element (40, 42); a motor (36) for driving the pumping element, wherein the motor (36) is arranged in a motor chamber (38); and a liquid lubrication, wherein the liquid lubrication is designed such that the motor chamber (38) is at least partially filled with lubricant during operation of the vacuum pump.