Compressor and refrigeration system having same
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Solution Overview
Problem
Conventional three-cylinder two-stage variable-capacity compressors experience overloading issues due to refrigeration oil accumulation when switching from two-cylinder to three-cylinder operation, leading to potential shutdowns and reliability risks.
Innovation Solution
The compressor design includes a housing with multiple compression cylinders, control valves, and a switching device that maintains a high-pressure environment within the variable-capacity cylinder during unloading, preventing refrigeration oil entry and ensuring stable operation by selectively connecting high and low-pressure pipelines to the third cavity, thereby managing pressure differences and preventing gas turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the variable-capacity cylinder is unloaded by connecting the tail of the pin to low pressure, then the compressor can operate in two cylinders, but refrigeration oil accumulates in the variable-capacity cylinder causing overloading and reliability issues
Solution Approach 1:
The patent changes the pressure parameter in the pin groove from low pressure to high pressure during unloading. By connecting the pin groove to the high-pressure exhaust port instead of the low-pressure suction port, the pressure difference between head and tail of the pin is eliminated, preventing refrigeration oil accumulation while maintaining variable-capacity functionality
Solution Approach 2:
The patent introduces a switching device as an intermediary component that controls the connection between the pin groove and different pressure zones. This switching device mediates the pressure connection to ensure proper oil film formation and prevent harmful oil accumulation during capacity switching
2Ease of operation
If the pin groove is connected to low pressure for unloading, then the sliding vane can be locked, but the large pressure difference causes refrigeration oil to enter through clearances and accumulate
Solution Approach 1:
The patent changes the pressure parameter in the pin groove from low pressure to high pressure. By equalizing the pressure at the head and tail of the pin through high-pressure connection, the pressure-driven oil infiltration through clearances is eliminated while preserving the sliding vane locking function
Solution Approach 2:
Instead of using low pressure at the pin groove to achieve unloading, the patent inverts the approach by using high pressure. This inversion eliminates the pressure difference that drives oil accumulation while maintaining the mechanical locking capability through the pin-sliding vane engagement
3Productivity
If the compressor switches from two-cylinder to three-cylinder operation, then the variable-capacity cylinder resumes compression, but the accumulated refrigeration oil causes sudden load increase and over-current protection
Solution Approach 1:
The patent performs preliminary action by maintaining high pressure in the pin groove and variable-capacity cylinder during unloading, which prevents refrigeration oil accumulation in advance. This preliminary pressure maintenance ensures that when the cylinder resumes compression, no oil accumulation occurs to cause sudden loading
Solution Approach 2:
The patent applies preliminary anti-action by using high pressure to counteract the tendency of refrigeration oil to accumulate in the variable-capacity cylinder before compression resumes. This preemptive pressure application prevents the harmful oil accumulation that would otherwise cause overloading and shutdown
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 solution effectively prevents overloading and ensures reliable operation by maintaining a high-pressure environment within the variable-capacity cylinder, reducing the risk of refrigeration oil accumulation and turbulence, thus enhancing compressor stability and efficiency.
Implementation Method 1
the pin 2′ moves upward under an elastic force of a spring 4′
Implementation Method 2
a pressure difference is formed between the head of the pin 2′ and the tail of the pin 2′, the pin 2′ moves downward against the elastic force of the spring 4′
Data Source
AI summary
Provided are a compressor and a refrigeration system having the same. The compressor includes: a housing, a lower flange structure, a first compression cylinder and a second compression cylinder. The first compression cylinder includes a cylinder body, a roller and a sliding vane. A sliding vane groove is provided on an inner wall of the cylinder body. The roller is provided in the cylinder body. The sliding vane is provided in the sliding vane groove and matched with the roller. A first reset member is provided between the sliding vane and the sliding vane groove. A lock groove in positional correspondence to a pin groove is provided on the sliding vane. A first cavity is formed between the sliding vane and the sliding vane groove. A second cavity is formed between a pin and the sliding vane. A third cavity is formed between the pin and the pin groove.