Compressor and air conditioner system
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Solution Overview
Problem
Conventional double-cylinder enthalpy-increasing compressors face issues with small cylinder volumes, poor efficiency, and difficulty in processing due to large volumetric ratios, as well as poor vapor injection effects under small pressure ratios, leading to performance degradation.
Innovation Solution
A compressor design with a gas pre-exhausting device and switching control valves allows for operation in double-stage and double-cylinder enthalpy-increasing modes, enabling free switching between modes without additional components, thereby increasing the volume of the small cylinder and improving efficiency, and unloading part of the compressor volume under small pressure ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional double-cylinder enthalpy-increasing compressor is designed with a small second cylinder to achieve vapor injection effect, then the vapor injection effect is improved under large pressure ratio, but the efficiency of the small cylinder becomes poor and the manufacturing difficulty increases
Solution Approach 1:
The gas pre-exhausting device pre-exhaustes gas from the first cylinder before the normal compression cycle completes, allowing the second cylinder to receive pre-exhausted gas at a more favorable pressure state. This preliminary action enables the second cylinder to operate more efficiently without requiring an excessively small volume, thus resolving the contradiction between achieving vapor injection effect and maintaining manufacturability.
Solution Approach 2:
The invention changes the pressure parameters of the gas entering the second cylinder by introducing a pre-exhausting stage. The pre-exhausting port and control valve adjust the pressure and timing of gas transfer between cylinders, optimizing the operating conditions for the second cylinder without requiring extreme miniaturization, thereby improving both efficiency and manufacturability.
2Reliability
If the volumetric ratio between the two cylinders is made large (e.g., 10:1) to achieve vapor injection, then the vapor injection effect is improved, but the efficiency of the small cylinder deteriorates and processing becomes more difficult
Solution Approach 1:
By pre-exhausting gas from the first cylinder before it enters the second cylinder, the invention creates more favorable pressure conditions for the second cylinder's operation. This preliminary action allows the second cylinder to process gas more efficiently, improving productivity without requiring an extreme volumetric ratio that would harm efficiency.
Solution Approach 2:
The gas pre-exhausting device acts as an intermediary between the first and second cylinders, modifying the gas state (pressure, timing) before transfer. This intermediary function optimizes the operating conditions for the second cylinder, enabling better efficiency while maintaining the volumetric ratio needed for vapor injection effect.
3Device complexity
If a double-cylinder enthalpy-increasing compressor operates under small pressure ratio conditions, then the structure is simple, but the vapor injection effect deteriorates and performance degrades
Solution Approach 1:
The invention introduces a dynamic control mechanism through the pre-exhausting control valve that can adjust its operation based on system conditions. Under small pressure ratio conditions, the valve can modulate the pre-exhausting flow to maintain effective vapor injection, allowing the compressor to maintain good performance across a wider range of operating conditions without adding complex external switching devices.
Solution Approach 2:
The gas pre-exhausting device serves multiple functions: it enables effective vapor injection under large pressure ratio conditions, maintains performance under small pressure ratio conditions, and improves the efficiency of the second cylinder. This multi-functionality allows the compressor to operate effectively across different pressure ratio conditions without requiring external switching mechanisms.
4Adaptability or versatility
If external switching devices are added to enable mode switching in double-cylinder compressors, then the adaptability to different operating modes is improved, but the system complexity increases
Solution Approach 1:
The invention merges the mode switching function with the internal structure of the compressor by integrating the pre-exhausting control valve and its control logic within the compressor body. This eliminates the need for external switching devices, reducing system complexity while maintaining the ability to switch between single-stage and double-cylinder enthalpy-increasing modes.
Solution Approach 2:
The compressor performs mode switching autonomously through its internal pre-exhausting control system that responds to system pressure conditions. The control valve automatically adjusts its state based on operating conditions, enabling the compressor to self-regulate between different operating modes without requiring external control devices or complex switching mechanisms.
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 design enhances the efficiency of the small cylinder, allows for dual-mode operation with improved performance across a wide range of pressure ratios, and simplifies the system by eliminating the need for external switching devices, making it easier to manufacture and operate.
Implementation Method 1
a pre-exhausting port (1161) and a first control valve (1162) that controls the pre-exhausting port to be open or closed. The pre-exhausting port is connected to the second gas intake (121)
Implementation Method 2
double-stage enthalpy-increasing operating mode or a double-cylinder enthalpy-increasing operating mode
Implementation Method 3
a switching control valve group disposed between the first cylinder and the second cylinder, and configured to enable the compressor to work in a double-stage enthalpy-increasing operating mode or a double-cylinder enthalpy-increasing operating mode or an unloaded operating mode
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Disclosed is a compressor (1). The compressor includes: a first cylinder (11), the first cylinder (11) being provided with a first gas intake (111) and a first gas outlet (112), the first air outlet (112) being connected to a predetermined heat exchanger; a second cylinder (12), the second cylinder (12) being provided with a second gas intake (121) and a second gas outlet (122), and the second gas outlet (122) being connected to the predetermined heat exchanger; and a gas pre-exhausting device (116). The gas pre-exhausting device (116) is provided on a cylinder block of the first cylinder (11) or on an upper end surface of the first cylinder (11) or a lower end surface of the first cylinder (11); the gas pre-exhausting device (116) includes a gas pre-exhausting port and a first control valve controlling the gas pre-exhausting port to be open or closed; and the gas pre-exhausting port is connected to the second gas intake (121). Further disclosed is an air conditioner system including the compressor (1). The compressor can greatly increase a volume of a small cylinder during a double-cylinder operation, thereby greatly reducing processing difficulty of the double-cylinder compressor used as a small capacity compressor, and meanwhile effectively improving efficiency of the small cylinder because of the increased volume of the small cylinder.