Two-Stage Rotary Compressor Mode Switching for Low-Temperature Heating
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Solution Overview
Problem
Refrigeration cycle devices, such as air conditioners, face challenges in maintaining performance and energy efficiency under varying temperature loads, particularly at ultra-low temperatures, where gas suction mass flow rates decrease, leading to reduced heating capacity and increased compressor wear.
Innovation Solution
A two-stage rotary compressor with a gas injection pipe, housing, and two cylinders, allowing for both single-stage and two-stage compression modes, which adjusts gas flow and pressure to optimize performance and energy efficiency based on load conditions.
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 ultra-low temperature conditions
Solution Approach 1:
The compressor dynamically switches between single-stage and two-stage compression modes based on operating conditions. A gas injection valve controls whether refrigerant gas is injected into the compression chamber, allowing the system to adapt to varying temperature and load conditions, thereby maintaining both energy efficiency and heating capacity across different operating ranges.
Solution Approach 2:
The system changes the compression parameter by adjusting the number of compression stages. Under ordinary conditions, single-stage compression is used for efficiency; under ultra-low temperature conditions, two-stage compression is activated by injecting gas into the compression chamber, increasing the gas mass flow rate and heating capacity while managing the trade-off through parameter adjustment.
2Power
If two-stage compression is used under ultra-low temperature conditions, then heating capacity and gas mass flow rate are improved, but device complexity increases
Solution Approach 1:
The gas injection valve serves multiple functions: it controls the injection of refrigerant gas to enable two-stage compression, acts as a flow control mechanism, and integrates into the existing compressor structure. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity while achieving improved heating capacity.
Solution Approach 2:
The gas injection valve acts as an intermediary component that enables the transition between single-stage and two-stage compression modes. By controlling gas injection, it mediates the compression process, allowing the system to achieve two-stage compression effects without requiring a completely separate two-stage compressor system, thus managing complexity.
3Productivity
If two-stage compression is used under large load conditions, then gas mass flow rate and heating capacity are increased, but compressor wear increases due to reduced lubrication
Solution Approach 1:
The system incorporates feedback control through the gas injection valve, which monitors operating conditions and adjusts gas injection accordingly. Under large load conditions, the valve regulates the amount of gas injected to maintain optimal compression while ensuring sufficient refrigerant remains for lubrication, thereby preventing excessive compressor wear while maintaining high gas mass flow rate and heating capacity.
Solution Approach 2:
The system dynamically adjusts compression parameters by controlling the degree of gas injection. Under large load conditions, the gas injection valve modulates the injection amount to achieve the desired gas mass flow rate while maintaining parameters that ensure adequate lubrication, thus balancing productivity gains with reliability preservation.
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 enhances gas mass flow rates, heating capacity, and energy efficiency under high loads, while improving lubrication and reducing wear, and maintains efficiency under ordinary temperature conditions by switching between single-stage and two-stage compression modes.
Implementation Method 1
a piston disposed within the gas injection chamber and capable of rolling along an inner wall of the gas injection chamber
Implementation Method 2
a sliding vane movably disposed inside the sliding vane groove
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
Implementation Method 4
two-stage rotary compressor includes: a gas injection pipe; a housing provided with a liquid reservoir outside the housing and a gas injection chamber within the housing
Implementation Method 5
the heat taken away by the refrigerant is reduced, which may easily cause abrasion of a compressor pump body
Implementation Method 6
when a refrigeration cycle device, like an air conditioner, is operating under a large load, such as heating under an ultra-low temperature
Data Source
AI summary
A refrigeration cycle device and a two-stage rotary compressor thereof. The two-stage rotary compressor includes a housing with a gas injection chamber and two cylinders disposed therein; the gas injection chamber connected to a liquid reservoir disposed outside of the housing and a gas injection pipe; a first cylinder in communication with the gas injection chamber; a second cylinder connected to the liquid reservoir, and having a sliding vane groove and a compression chamber with a piston disposed therein in communication with the gas injection chamber; a sliding vane, received in the sliding vane groove when the gas injection chamber is in communication with the liquid reservoir, with an outer end and the sliding vane groove defining a backpressure chamber in communication with the gas injection chamber; and with an inner end abutting against the piston when the gas injection chamber is in communication with the gas injection pipe.