Hermetic Compressor Elliptical Cylinder Vane Guide
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Solution Overview
Problem
Conventional vane rotary compressors experience increased mechanical friction loss due to continuous contact between the cylinder and vane, leading to inefficiencies and refrigerant leakage, as the inner circumference of the cylinder is circular, causing high friction and uneven contact forces.
Innovation Solution
An elliptical hybrid cylinder design with guide portions on the vanes that interlock with guide grooves in the bearings, reducing contact area and linear velocity, and adjusting back pressure to minimize friction and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inner circumference of the cylinder is circular, then the structure is simple and easy to manufacture, but the friction loss increases and compression efficiency decreases
Solution Approach 1:
The patent applies asymmetry by changing the cylinder's inner circumference from a circular shape to an elliptical shape. This asymmetric geometry creates varying contact forces between the vane and cylinder wall during rotation, reducing the linear velocity of the vane and thereby decreasing mechanical friction loss while maintaining manufacturing feasibility
Solution Approach 2:
The patent changes the geometric parameter of the cylinder from a circular cross-section to an elliptical cross-section. This parameter change optimizes the contact characteristics between moving parts, reducing friction and improving compression efficiency without fundamentally altering the manufacturing process
2Reliability
If the vane continuously contacts the cylinder, then sealing is improved, but mechanical friction loss increases
Solution Approach 1:
The elliptical cylinder creates asymmetric contact conditions where the vane contacts the cylinder wall at specific phases of rotation. This maintains sealing during compression while reducing contact during high-velocity phases, thereby reducing friction loss without compromising sealing reliability
3Reliability
If the contact force between vane and cylinder is high, then sealing is improved, but refrigerant leakage increases due to uneven contact
Solution Approach 1:
The elliptical geometry creates non-uniform contact force distribution around the cylinder perimeter. This asymmetric force distribution ensures adequate sealing pressure where needed while reducing excessive contact forces that cause refrigerant leakage, optimizing the balance between sealing and leakage prevention
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 elliptical cylinder and guide portion design decreases mechanical friction loss and refrigerant leakage by optimizing contact forces and velocities, enhancing compressor efficiency and performance.
Implementation Method 1
a roller 340, which is attached to a rotary shaft supported by the first and second bearings, is eccentric to the inner circumference of the cylinder and varies a volume of the compression chamber while rotating
Implementation Method 2
a vane that is inserted into the roller, rotates with the roller, and is pushed out toward the inner circumference of the cylinder by the rotation of the roller
Data Source
AI summary
A hermetic compressor is provided that may include a vane that is inserted into a roller, rotates with the roller, and is pushed out toward an inner circumference of a cylinder by rotation of the roller to divide the compression chamber into a plurality of spaces. The vane may include a body having a sealing surface that contacts the inner circumference of the cylinder and inserted into the roller; and a guide that extends from an axial end of the body in a direction crossing a direction the vane slides out, and that is slidably inserted into a guide groove formed on at least one of the first bearing or the second bearing to restrain the vane from sliding out of the roller toward the inner circumference of the cylinder.