Vacuum Pump Feedthrough Tolerance Compensation
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Solution Overview
Problem
The existing connection methods for power feedthrough in vacuum pumps are complex and costly due to the susceptibility of glass encapsulation to mechanical stress, requiring flexible lines that complicate assembly and increase manufacturing expenses.
Innovation Solution
A drive and control device with a vacuum-tight power feedthrough using plug contacts connected via a second current conductor, where the plug contact is directly connected to the current bushing and secured via a connecting web, allowing for a simple and cost-effective connection that compensates for tolerances without introducing forces into the feedthrough.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible line is used to connect the current bushing to the control device, then the glass encapsulation is protected from mechanical stress, but the assembly complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent divides the connection system into two independent parts: a rigid plug contact integrated with the control device and a separate socket in the current bushing. This segmentation eliminates the need for flexible lines while allowing independent positioning and assembly, thus simplifying the overall structure and reducing assembly complexity.
Solution Approach 2:
The patent introduces a magnetic coupling mechanism as an intermediary between the plug contact and the socket. This magnetic intermediary enables electrical connection and mechanical positioning without direct physical contact, eliminating the need for flexible cables and simplifying the connection structure.
2Reliability
If a flexible line is used to connect the current bushing to the control device, then the glass encapsulation is protected from mechanical stress, but the manufacturing cost increases due to manual assembly requirements
Solution Approach 1:
The patent divides the connection system into two independent parts: a rigid plug contact integrated with the control device and a separate socket in the current bushing. This segmentation eliminates the need for flexible lines while allowing independent positioning and assembly, thus simplifying the overall structure and reducing assembly complexity.
Solution Approach 2:
The patent introduces a magnetic coupling mechanism as an intermediary between the plug contact and the socket. This magnetic intermediary enables electrical connection and mechanical positioning without direct physical contact, eliminating the need for flexible cables and simplifying the connection structure.
3Device complexity
If pins are rigidly connected to the control device, then the connection is simple and cost-effective, but mechanical stress damages the glass encapsulation due to tolerances
Solution Approach 1:
The patent changes the mechanical parameters of the connection system by introducing magnetic coupling forces. This allows the plug contact to be attracted to the socket with controlled force, enabling simple rigid connection geometry while compensating for manufacturing tolerances through magnetic force adjustment, thus protecting the glass encapsulation.
Solution Approach 2:
The patent applies preliminary magnetic attraction forces to pre-position the plug contact and socket before final mechanical engagement. This preliminary anti-action prevents excessive forces from damaging the glass encapsulation during assembly by establishing a gentle guiding force that accommodates tolerances.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
In a separating wall (16), which separates a vacuum region (18) from a region (20) under atmospheric pressure, pins (24) are provided as a current lead-through. The pins (24) are cast in, for example, glass (26). According to the invention, a plug-in contact (28) is arranged on a separate carrier plate (30) in order to prevent force or stresses, which can occur in particular because of tolerances, from being introduced into the glass. The carrier plate (30) is connected to the control device (12) by means of a flexible cable (32).