Scroll Compressor Slide Bush Eccentricity Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Scroll compressors experience excessive pressing forces from the orbiting scroll applied to the fixed scroll, particularly at high rotational speeds, due to increased eccentricity, which complicates the design and operation, especially when rotational speeds vary widely.
Innovation Solution
A slide bush portion is introduced between the bearing of the orbiting scroll and the eccentric shaft, featuring a slide bush and an inner bush with specific slide surfaces and a protrusion, allowing eccentricity to be adjusted based on rotational speed, thereby controlling the pressing force applied to the fixed scroll. This mechanism includes a balance weight or hole to adjust the center of gravity, ensuring the eccentricity is reduced at high speeds and increased at low speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the eccentricity of the orbiting scroll is increased upon application of gas load, then the compression force is improved, but at high rotational speeds the orbiting scroll applies excessive pressing force to the fixed scroll
Solution Approach 1:
The slide bush portion is designed to dynamically adjust the eccentricity of the orbiting scroll based on rotational speed. At low speeds, the gas load increases eccentricity to enhance compression force. At high speeds, centrifugal force acts on the slide bush to reduce eccentricity and suppress excessive pressing force on the fixed scroll
Solution Approach 2:
The system changes the parameter of eccentricity dynamically according to rotational speed conditions. The slide bush mechanism allows the eccentricity parameter to vary automatically - increasing under gas load at low speeds for better compression, and decreasing at high speeds to prevent excessive pressing force
2Productivity
If the eccentricity is increased to improve compression at low speeds, then the compression performance is improved, but the same structure causes excessive pressing force at high speeds
Solution Approach 1:
The slide bush portion creates a dynamic system where eccentricity adapts to operational conditions. The mechanism automatically adjusts the orbiting scroll's eccentricity based on the balance between gas load and centrifugal force, ensuring optimal compression performance at low speeds while maintaining reliability at high speeds
3Device complexity
If a fixed eccentricity structure is used, then the design is simple, but it cannot adapt to varying rotational speeds
Solution Approach 1:
The slide bush mechanism is a self-regulating system that automatically adjusts eccentricity based on operating conditions without external control. The interaction between gas load and centrifugal force on the slide bush creates automatic adaptation to varying rotational speeds, maintaining both simplicity and versatility
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
The solution effectively suppresses excessive pressing forces at high rotational speeds and allows for proper compression at low speeds, enhancing the operational stability and efficiency of the scroll compressor by dynamically managing eccentricity in response to changing rotational speeds.
Implementation Method 1
A first torque generated by the rotation of the bearing of the orbiting scroll and a second torque generated by the centrifugal force on the slide bush and the inner bush may be applied to the slide bush and the inner bush
Implementation Method 2
the first slide surface may be in contact with the second slide surface so that the slide bush is rotated in accordance with the rotation of the inner bush
Data Source
AI summary
A scroll compressor includes a fixed scroll fixed inside a housing, an orbiting scroll configured to orbit engaged with the fixed scroll, a rotary shaft configured to allow the orbiting scroll to orbit by supporting the orbiting scroll with an eccentric shaft eccentric from a main shaft, and a slide bush portion installed between a bearing of the orbiting scroll and the eccentric shaft and according to a rotational speed of the rotary shaft, configured to change a pressing force of the orbiting scroll applied to the fixed scroll by allowing an eccentricity to be changed by a gas load applied to the orbiting scroll.