Vacuum Pump Countersunk Spacer for Exhaust Performance
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Solution Overview
Problem
Conventional vacuum pumps face challenges in maintaining exhaust performance when using a linked-type thread groove spacer, as the fixing bolt can obstruct gas flow and increase manufacturing costs due to complex component configurations and larger sizes.
Innovation Solution
A vacuum pump design featuring a countersunk hole in the exhaust channel surface of the linked-type thread groove spacer, allowing the fixing bolt to be securely fastened without protruding into the exhaust channel, thereby preventing performance degradation and simplifying assembly by enabling top-side mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the linked-type thread groove spacer is fastened with a fixing bolt, then the assembly is secured, but the fixing bolt obstructs gas flow and lowers exhaust performance
Solution Approach 1:
The fixing bolt head is nested within a countersunk hole in the exhaust channel surface, allowing the bolt to secure the spacer while its head does not protrude into the gas flow path, thus maintaining exhaust performance while achieving secure fastening
Solution Approach 2:
The countersunk hole acts as an intermediary structure that accommodates the fixing bolt head, mediating between the need for secure fastening and the requirement to maintain unobstructed gas flow in the exhaust channel
2Productivity
If the thread groove portion length is prolonged to improve compression performance, then compression performance improves, but the base size and manufacturing cost increase
Solution Approach 1:
The thread groove spacer uses a linked-type configuration that extends the compression channel in the radial direction rather than only in the axial direction, allowing compression performance improvement without proportionally increasing base size
Solution Approach 2:
The thread groove channel is divided into multiple linked segments that can be arranged in a compact configuration, achieving the required compression path length without increasing the overall base footprint
Data Source
AI summary
A vacuum pump which can prevent lowering of an exhaust performance of the vacuum pump, even if a linked-type thread groove spacer is fastened by a fixing bolt, is provided.The linked-type thread groove spacer according to an embodiment of the present invention includes a structure for linking a Siegbahn pump portion and a thread-groove pump portion. When this linked-type thread groove spacer is to be fastened, a countersunk hole is provided in advance in an exhaust channel portion, and the linked-type thread groove spacer is fastened to a base by a fixing bolt. As a result, a head part of the fixing bolt does not protrude to the exhaust channel, and the head part of the fixing bolt does not make resistance against an exhaust gas. Thus, lowering of the exhaust performance of the vacuum pump can be suppressed.