Rotary compressor and compression unit thereof, and air conditioner
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Solution Overview
Problem
Single-cylinder rotary compressors experience significant vibration and noise due to torque fluctuation, while double-cylinder compressors increase manufacturing costs and friction losses, necessitating a solution that reduces noise and costs while improving torque fluctuation.
Innovation Solution
A compression device for rotary compressors with a hollow air cylinder, sliding vanes, and strategically positioned air suction and discharge ports, along with suction valves, to manage torque fluctuation and reduce vibration, noise, and costs, achieving performance similar to double-cylinder compressors without the added complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-cylinder eccentric compression technology is adopted, then the structure is simple and manufacturing cost is low, but torque fluctuation is large causing serious vibration and noise
Solution Approach 1:
The single cylinder is divided into two working chambers by two sliding vanes, creating multiple compression zones within one cylinder. This segmentation allows torque fluctuation to be reduced while maintaining the simple single-cylinder structure, effectively lowering vibration and noise without increasing device complexity
Solution Approach 2:
The patent designs the air suction ports and discharge ports to be strategically positioned adjacent to different sliding vane slots, creating periodic gas flow patterns that balance torque fluctuations throughout the rotation cycle. This periodic action reduces the amplitude of torque variation, thereby decreasing vibration and noise while keeping the structure simple
2Object-generated harmful factors
If double-cylinder rotary compressor is adopted, then torque fluctuation is reduced and vibration performance is improved, but manufacturing cost increases dramatically and friction losses increase
Solution Approach 1:
The patent merges the functions of two cylinders into a single cylinder by using two sliding vanes to create two working chambers. This combining approach achieves the torque fluctuation reduction benefit of double-cylinder compressors while avoiding the increased manufacturing cost and device complexity associated with actual dual-cylinder designs
Solution Approach 2:
The single cylinder is designed to perform multiple compression functions simultaneously through two sliding vanes and two working chambers. This multi-functionality allows the compressor to achieve balanced torque characteristics typically requiring two cylinders, while maintaining the cost-effectiveness and simplicity of a single-cylinder design
3Object-generated harmful factors
If double-cylinder rotary compressor is adopted, then torque fluctuation is reduced, but friction pairs increase causing increased friction losses
Solution Approach 1:
By merging two cylinder systems into one, the patent reduces the total number of friction pairs (piston-cylinder, valve-seat, etc.) while still achieving balanced torque through the two sliding vane chambers. This combining approach lowers friction losses compared to actual double-cylinder designs while maintaining the torque fluctuation benefits
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 reduces vibration and noise, improves torque fluctuation, and maintains cost competitiveness with single-cylinder compressors, enhancing the compressor's performance and displacement.
Implementation Method 1
a piston actuated by an eccentric crankshaft, provided within the chamber eccentrically and being rollable along an inner wall of the chamber
Implementation Method 2
a first sliding vane and a second sliding vane, in which the first sliding vane and the second sliding vane are provided respectively within the first sliding vane slot and the second sliding vane slot movably
Data Source
AI summary
A compression device includes an air cylinder (31); an upper bearing (4) and a lower bearing (5); a piston (71) which defines a working space; a first slide vane (81) and a second slide vane (82) which separate the working space into a first and a second working chamber; a first air suction port (101) and a second air suction port (102) both of which are in communication with the working space; and a first air discharge port (91) and a second air discharge port (92) both of which are in communication with the working space. The first and the second air suction port satisfy the following condition: 0.25≤(V1/S1)*(S2/V2)≤4, where VI and V2 are respectively the maximum volume of the first and the second working chamber, and S1 and S2 are respectively the opening area of the first and the second air suction port.