Two-Stage Rotary Compressor Sliding Vane for Load-Adaptive Compression
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Solution Overview
Problem
Refrigeration cycle devices, such as air conditioners, face reduced heating capacity and energy efficiency under high loads due to decreased gas suction mass flow rate and lubrication issues, leading to compressor wear and reliability concerns.
Innovation Solution
A two-stage rotary compressor with a gas injection pipe, housing, and sliding vane mechanism that switches between single-stage and two-stage compression modes based on load conditions, enhancing gas mass flow rate and energy efficiency, and improving lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If single-stage compression is used under ordinary temperature conditions, then energy efficiency is improved, but heating capacity decreases under high load conditions
Solution Approach 1:
The compressor dynamically switches between single-stage and two-stage compression modes based on operating conditions. A sliding vane moves between a first position (single-stage mode) and a second position (two-stage mode) to adapt the compression process to varying load requirements, thereby maintaining energy efficiency under ordinary conditions while enabling high heating capacity under high load conditions
2Productivity
If two-stage compression is used under high load, then heating capacity and gas mass flow rate are improved, but device complexity increases
Solution Approach 1:
The compression process is segmented into two distinct stages with separate compression chambers. The first compression chamber performs initial compression while the second compression chamber performs final compression. This segmentation enables high heating capacity under high load while maintaining a relatively simple overall structure through the use of a shared crankshaft and standardized components
Solution Approach 2:
The compressor is designed with multi-functionality to operate in both single-stage and two-stage modes using the same basic structure. The sliding vane mechanism serves dual purposes: it seals the compression chambers during two-stage operation and can be positioned to enable single-stage operation, thereby reducing device complexity while maintaining productivity benefits
3Productivity
If high pressure is applied to increase gas mass flow rate, then heating capacity is improved, but lubrication performance deteriorates
Solution Approach 1:
Different pressure conditions are applied locally to different components. The compression chambers operate under high pressure to achieve high gas mass flow rate and heating capacity, while the lubrication system maintains appropriate pressure levels for proper lubrication. The sliding vane and cylinder bore are designed with specific local qualities (surface treatments, clearances) that ensure reliable lubrication even during high-pressure two-stage compression operation
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 two-stage rotary compressor effectively increases heating capacity and energy efficiency under high loads while maintaining efficiency under ordinary conditions, improving overall performance and reliability of refrigeration cycle devices.
Implementation Method 1
the sliding vane is movable between a first position and a second position along an axial direction of the second cylinder... when the sliding vane is at the first position, the second cylinder forms a two-stage compression mechanism... when the sliding vane is at the second position, the two-stage compression mechanism transforms into a single-stage compression mechanism
Implementation Method 2
a piston (642) disposed in the compression chamber (641)... the piston is capable of rolling along an inner wall of the compression chamber
Implementation Method 3
an inner end of the sliding vane abuts against the piston when the gas injection chamber is in communication with the gas injection pipe... the sliding vane is configured to be received in the sliding vane groove when the gas injection chamber is in communication with the liquid reservoir
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A refrigeration cycle device and a two-stage rotary compressor (100) thereof. The two-stage rotary compressor (100) includes a gas injection pipe (1), a housing (2), two cylinders, a piston and a sliding vanes; a liquid reservoir (3) is disposed outside the housing (2); a gas injection chamber (651) and the two cylinders are disposed within the housing (2); the gas injection chamber (651) is connected to the liquid reservoir (3) and the gas injection pipe (1); a first cylinder of the two cylinders is in communication with the gas injection chamber (651); a second cylinder thereof is connected to the liquid reservoir (3), and has a sliding vane groove and a compression chamber in communication with the gas injection chamber (651); the piston is disposed within the compression chamber; an outer end of the sliding vane and the sliding vane groove define a backpressure chamber in communication with the gas injection chamber (651); the sliding vane is received in the sliding vane groove when the gas injection chamber (651) is in communication with the liquid reservoir (3); and an inner end of the sliding vane abuts against the piston when the gas injection chamber (651) is in communication with the gas injection pipe.