Variable Capacity Compressor Valve Control for Low-Temperature Heating
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Solution Overview
Problem
Conventional fixed-speed compressors in air conditioners face challenges in maintaining heating capacity, especially at low ambient temperatures, due to reduced energy efficiency and increased energy consumption, which is exacerbated by the need for variable capacity operation to adapt to changing environmental conditions.
Innovation Solution
A variable-capacity compressor design featuring a housing with a compression mechanism including two bearings and a cylinder assembly, where at least one cylinder is configured as a variable-capacity cylinder, equipped with a movable variable-capacity valve that adjusts between communication and isolation positions to control suction and compression operations, allowing for efficient operation in both partial and full capacity modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional fixed-speed compressor is used to reduce energy consumption, then energy efficiency is improved, but heating capacity is significantly reduced at low ambient temperatures
Solution Approach 1:
The patent applies dynamics by making the compressor capacity variable rather than fixed. The compressor can dynamically adjust its displacement between a first displacement (first operating mode) and a second displacement (second operating mode) based on ambient temperature conditions, allowing it to maintain both energy efficiency and heating capacity under different operating conditions
Solution Approach 2:
The patent changes the physical parameter of compressor displacement. By varying the displacement parameter between two specific values, the system can optimize performance for different ambient temperatures - using smaller displacement for energy efficiency at moderate temperatures and larger displacement for heating capacity at low temperatures
2Reliability
If a variable-capacity compressor is designed with complex structures to improve heating capacity at low temperatures, then heating capacity is improved, but device complexity increases
Solution Approach 1:
The patent merges the variable capacity control function directly into the existing compressor structure. The first and second suction ports, along with the variable capacity mechanism, are integrated into the compressor body, eliminating the need for separate external control systems and reducing overall device complexity
Solution Approach 2:
The compressor is designed with multi-functionality by incorporating both first and second suction ports that can operate in different modes. The same compressor structure serves dual purposes: it provides high heating capacity at low temperatures through the first suction port while maintaining energy efficiency through the second suction port at moderate temperatures
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 variable-capacity compressor simplifies the structure and enhances reliability, ensuring consistent performance by adjusting capacity according to demand, thereby improving heating capacity, especially at low temperatures, while maintaining energy efficiency and reducing energy consumption.
Implementation Method 1
a pressure of the first pressure gas is greater than that of the second pressure gas; in which the variable-capacity valve is provided with a first pressure passage in communication with the pressure supply passage, and when the variable-capacity valve is located in the isolation position, the pressure supply passage supplies the first pressure gas into the compression chamber through the first pressure passage
Implementation Method 2
a compression mechanism disposed in the housing and including two bearings and a cylinder assembly disposed between the two bearings, in which the cylinder assembly includes a first cylinder and a second cylinder, at least one of the first cylinder and the second cylinder is configured as a variable-capacity cylinder, and a compression chamber and a suction port is formed in the variable-capacity cylinder
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
The present disclosure relates to a variable-capacity compressor (100) and a refrigeration device (200). The variable-capacity compressor (100) comprises a housing (1), a compression mechanism, two first suction conduits (61) and a variable-capacity valve (3); the compression mechanism comprises two bearings (21, 22) and a cylinder assembly, the cylinder assembly comprises a first cylinder (23) and a second cylinder (24), at least one of the first cylinder (23) and the second cylinder (24) is configured as a variable-capacity cylinder, and a compression chamber (28) and a suction port (A) is formed in the variable-capacity cylinder; the variable-capacity valve (3) is disposed in the compression mechanism and configured to be movable between a communication position and an isolation position, wherein the variable-capacity cylinder operates when the variable-capacity valve (3) is located in the communication position, and the variable-capacity cylinder is unloaded when the variable-capacity valve (3) is located the isolation position.