Vacuum Pump Two-Part Housing Thermal Segmentation
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Solution Overview
Problem
Vacuum pumps, particularly turbomolecular pumps, face challenges in managing high operating temperatures that reduce the service life of temperature-sensitive rolling bearings, which are often located in close proximity to heat-generating components and compression areas.
Innovation Solution
The design incorporates a two-part housing system where heat-sensitive components, such as bearings, are isolated from highly heat-generating components, allowing for separate cooling and heat dissipation through a thermally conductive connection between the housing parts and a carrier part, effectively reducing the operating temperature of bearings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bearings are located close to the electric drive unit and compression area to save space, then the device complexity is reduced, but the operating temperature of the bearings increases
Solution Approach 1:
The housing is divided into two separate parts: a first housing part that supports heat-sensitive bearings and a second housing part that supports heat-generating components (electric drive unit and compression area). This segmentation allows thermal isolation of the bearings from heat sources while maintaining compact overall structure.
2Volume of moving object
If the bearings are located in tight spaces near heat-generating components, then the device footprint is reduced, but the service life of the bearings decreases
Solution Approach 1:
The housing is segmented into thermally isolated sections, with the first housing part containing bearings positioned away from heat-generating components. This spatial segmentation through housing division protects bearing service life while maintaining compact device footprint.
Solution Approach 2:
The housing structure acts as a thermal intermediary, with the first housing part serving as a thermal barrier between the bearings and the second housing part containing heat-generating components. This intermediary structure reduces heat transfer to the bearings.
3Ease of manufacture
If the housing is designed as a single integrated structure, then the manufacturing simplicity is improved, but the heat dissipation efficiency decreases
Solution Approach 1:
The housing is divided into two separable parts that can be manufactured independently and then assembled. This segmentation enables optimized thermal management through separate cooling paths while maintaining manufacturing feasibility through modular construction.
Solution Approach 2:
Different regions of the housing have different thermal requirements. The first housing part (bearing support) is designed for thermal isolation, while the second housing part (drive and compression support) is designed for heat dissipation. This local differentiation optimizes both heat management and manufacturing.
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 approach extends the service life of bearings by minimizing heat transfer to sensitive components and simplifying heat dissipation, reducing energy expenditure and improving component positioning precision.
Implementation Method 1
The second housing part is connected to the drive device in a thermally conductive manner. This allows the heat generated by the drive device to be dissipated easily.
Data Source
AI summary
The invention relates to a vacuum pump comprising a rotor shaft (10), which bears one or more rotor elements (20, 22). The rotor shaft (10) is driven by an electrical driving device (30). A stator device (24) is arranged between the rotor elements (20, 22). The rotor shaft (10) is supported by bearings (32). The highly heat-generating components such as the driving device (30) and the stator device (24) are connected to a second housing part (28) in particular by means of a support part (36). Heat-sensitive components such as the bearing (32) are supported by means of a separate first housing part (34). The two housing parts can be kept at different temperatures, for example by means of separate cooling devices. Thus, the operating temperature of the in particular pressure-side bearing (32) can be reduced, and therefore the service life can be extended.