Rotary Compressor Vane Pin Guiding Mechanism
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Solution Overview
Problem
In rotary compressors, the contact between vanes and cylinders leads to increased friction loss, decreased compression efficiency, and reliability issues due to wear, particularly when the inner cylinder surface is asymmetrical, affecting the positioning of suction and discharge ports and the compression ratio.
Innovation Solution
The design incorporates a rotational shaft supported by first and second bearings, with a cylinder forming a compression space and a rotor that compresses refrigerant, featuring vanes with pins that extend axially and are guided by rail grooves in the bearings to prevent direct contact with the cylinder, optimizing compression efficiency and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inner peripheral surface of the cylinder is formed in an asymmetrical shape to improve compression efficiency, then compression efficiency is improved, but friction loss increases due to contact between the vane and cylinder
Solution Approach 1:
A lubricating film is introduced as an intermediary between the vane and the inner peripheral surface of the cylinder. This lubricating film prevents direct contact between the vane and cylinder surfaces, thereby reducing friction loss while allowing the vane to maintain proper positioning for efficient compression. The lubricating film acts as a mediator that enables the asymmetrical cylinder design to function without the harmful direct contact effects.
2Power
If the suction port and discharge port are sequentially formed adjacent to each other to increase compression path, then compression ratio is improved, but reliability decreases due to wear from contact between vane and cylinder
Solution Approach 1:
The lubricating film serves as a protective intermediary that prevents direct contact and wear between the vane and cylinder surfaces. This allows the compressor to maintain the sequential port arrangement for high compression ratio while the lubricating film protects against wear, thereby preserving reliability over extended operation.
Solution Approach 2:
The lubricating film provides beforehand cushioning by preventing direct contact between the vane and cylinder before wear can occur. This protective layer is maintained continuously during operation, cushioning against potential wear damage and extending the operational life of the compressor components.
3Productivity
If the vane is drawn out to contact the cylinder to form compression chambers, then compression chambers are formed, but friction loss increases compared to general rotary compressor
Solution Approach 1:
The lubricating film acts as an intermediary that enables the vane to be drawn out and maintain positioning for proper compression chamber formation, while simultaneously preventing direct contact between the vane and cylinder. This resolves the contradiction by allowing compression chamber functionality without the associated friction loss of direct contact.
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 configuration enhances compression efficiency by preventing refrigerant leakage and reducing the load on vane pins, thereby extending the product's lifespan and maintaining reliability by minimizing contact between vanes and cylinders.
Implementation Method 1
the contact between vanes and cylinders leads to increased friction loss
Implementation Method 2
a rotor that compresses refrigerant as the rotor rotates
Data Source
AI summary
A rotary compressor is provided that may include a rotational shaft, first and second bearings configured to support the rotational shaft in a radial direction, a cylinder disposed between the first and second bearings to form a compression space, a rotor disposed in the compression space and coupled to the rotational shaft to compress a refrigerant as the rotor rotates, and at least one vane slidably inserted into the rotor, the at least one vane coming into contact with an inner peripheral surface of the cylinder to separate the compression space into a plurality of regions. The at least one vane may include a pin that extends in an axial direction, and at least one of the first bearing and the second bearing may include a rail groove into which the pin may be inserted.