Compressor Impeller Locking Structure Without On-Site Drilling
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Solution Overview
Problem
The existing locking structure of compressor impellers is complex, requiring additional left-hand threads on the rotary shaft and on-site drilling, which complicates installation and maintenance, and results in a heavier nose piece due to the need for a thicker design.
Innovation Solution
A locking structure featuring a rotary shaft with a lock nut and impeller, where the impeller has threaded holes communicating with waist-shaped holes in the lock nut, and a nose piece with through holes aligning with these, allowing bolts to secure the components without the need for on-site drilling and enabling a thinner, lighter nose piece design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the nose piece is designed with threaded connection to the rotary shaft, then the connection strength is improved, but the nose piece weight increases and processing complexity increases
Solution Approach 1:
The connection structure is divided into two parts: a non-threaded portion of the rotary shaft and a threaded lock nut. The threading is segmented to only the lock nut rather than the entire shaft, allowing the nose piece to be connected without requiring threaded holes in the shaft itself, thus reducing nose piece weight while maintaining connection strength.
Solution Approach 2:
The lock nut acts as an intermediary component between the rotary shaft and the nose piece. It provides the threaded connection function while allowing the nose piece to remain unthreaded, thereby reducing its weight and processing complexity while maintaining secure attachment.
2Reliability
If left-hand threads are designed on the rotary shaft for nose piece connection, then the connection reliability is improved, but the processing complexity of the rotary shaft increases
Solution Approach 1:
The threading function is extracted from the rotary shaft and transferred to the lock nut. This eliminates the need for complex left-hand threading on the shaft, simplifying its processing while the lock nut handles all threading requirements for secure connection.
Solution Approach 2:
The lock nut serves as an intermediary that absorbs the complexity of threading operations. It provides both right-hand and left-hand threading capabilities without requiring the rotary shaft to have complex threaded features, thus improving ease of manufacture while maintaining connection reliability.
3Adaptability or versatility
If on-site drilling is required to secure the nose piece, then the installation flexibility is improved, but the installation difficulty increases
Solution Approach 1:
The alignment holes (waist-shaped holes in the lock nut and corresponding holes in the nose piece) are pre-formed during manufacturing. This preliminary action eliminates the need for on-site drilling operations, making installation easier while retaining the flexibility of field assembly and adjustment.
4Adaptability or versatility
If multiple threading types are designed on the rotary shaft, then the functional requirements are met, but the device complexity increases
Solution Approach 1:
The lock nut is designed with multi-functionality, incorporating both right-hand threading for securing to the rotary shaft and left-hand threading for attaching the nose piece. This universal design consolidates multiple functions into a single component, reducing overall device complexity while meeting all functional requirements.
Data Source
AI summary
A locking structure of a compressor impeller, which includes: a rotary shaft; a lock nut arranged on an end of the rotary shaft by means of a threaded connection and provided with waist-shaped holes extending along a circumferential direction thereof; an impeller sleeved on the end of the rotary shaft and located on an inner side of the lock nut, the impeller is provided with threaded holes in communication with the waist-shaped holes of the lock nut; a nose piece located on an outer side of the lock nut and provided with through holes in communication with the waist-shaped holes of the lock nut; and bolts passing through the through holes and the waist-shaped holes in turn into the threaded holes, thereby fixing the nose piece, the lock nut and the impeller together.