Rotary Compressor with Nested Compression Chambers
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Solution Overview
Problem
Existing rotary compressors face issues with increased vibration and friction loss due to eccentric loads, refrigerant leakage, and difficulty in volume control, as well as pulsation phenomena leading to vibration noise, particularly in 1-suction, 2-discharge and 1-cylinder, 2-compression chamber types.
Innovation Solution
A 1-cylinder, 2-compression chamber type rotary compressor design with a fixed cylinder and a rolling piston that performs a turning movement, featuring an outer and inner cylinder portion and a vane portion to divide the compression spaces, with optimized bearing structures and discharge port configurations to reduce friction loss and pulsation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a 1-suction, 2-discharge type rotary compressor with eccentric crank shaft is used, then refrigerant compression is achieved, but vibration and friction loss increase due to eccentric load
Solution Approach 1:
Instead of rotating the cylinder around an eccentric crank shaft (conventional design), the invention inverts the approach by keeping the cylinder fixed and rotating the piston within the cylinder. This eliminates the eccentric load on the crank shaft, reducing vibration and friction loss while maintaining compression capability
Solution Approach 2:
The compressor is divided into two independent compression chambers (first and second compression spaces) within a single cylinder, each with its own piston. This segmentation allows each piston to operate independently without the eccentric load problems of a single rotating crank shaft, reducing overall friction loss
2Productivity
If multiple cylinders are used in a multiple hermetic compressor, then compression capacity increases, but device complexity and difficulty in volume control increase
Solution Approach 1:
Two compression chambers are nested within a single cylinder structure, with pistons operating independently inside the same cylindrical housing. This nested configuration achieves multi-compression capacity while maintaining a compact, simple overall structure that is easier to control and manufacture
Solution Approach 2:
Multiple compression functions are merged into a single cylinder-piston assembly rather than using separate cylinders. The first and second pistons work within one cylinder to provide combined compression capacity, simplifying the device structure and improving volume control
3Reliability
If a rolling piston with vane portion is used to divide compression spaces, then refrigerant sealing is improved, but refrigerant leakage occurs between vane and piston during separation
Solution Approach 1:
The vane portion is designed as a flexible thin plate that can dynamically adjust its position. As the piston rotates, the vane maintains continuous contact with the cylinder wall through its flexibility, sealing the compression spaces effectively and preventing refrigerant leakage even during piston movement and separation
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 design achieves low power loss, reduces refrigerant leakage, and allows for easy capacity adjustment while minimizing vibration noise by absorbing discharged refrigerant, resulting in improved compressor efficiency and noise reduction.
Implementation Method 1
a rolling piston which is inserted between the outer cylinder portion and the inner cylinder portion to divide a compression space between the outer cylinder portion and the inner cylinder portion into an outer compression space and an inner compression space
Implementation Method 2
a vane portion which connects between an inner circumferential surface of the outer cylinder portion and an outer circumferential surface of the inner cylinder portion
Implementation Method 3
a first discharge port which communicates with the outer compression space and is formed on the upper bearing, and a second discharge port which communicates with the inner compression space and is formed on the lower bearing, wherein the first discharge port and the second discharge port are positioned at different heights
Data Source
AI summary
A compressor is provided that may include a cylinder including an outer cylinder portion, an inner cylinder portion, and a vane portion connected between the outer cylinder portion and the inner cylinder portion, which is fixed to a casing. A rolling piston may be slidably coupled to the vane portion to form an outer compression space and an inner compression space while making a turning movement between the outer cylinder portion and the inner cylinder portion. Through this, a weight of a rotating body may be reduced to obtain a low power loss with respect to the same cooling power and a small bearing area, thereby reducing refrigerant leakage as well as easily changing a capacity of a cylinder in an expanded manner. In addition, refrigerant may be discharged in opposite directions to each other in each compression space, thereby reducing vibration noise of the compressor.