Two-Stage Refrigerant Compressor With Adjustable Compression Ratios
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The structure of existing two-stage refrigerant compressors affects air discharge pressure and suction pressure interactions, leading to inefficiencies under varying operating conditions, as the air discharge and suction pressures of the first and second stage rotors are not within a controllable and adjustable range.
Innovation Solution
A two-stage refrigerant compressor design with adjustable compression ratios and volume ratios, controlled by a processor that manages the rotating speeds of motors and slide valves based on pressure and temperature feedback, ensuring all factors affecting performance are within a controllable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed external pipeline structure is used in a two-stage refrigerant compressor, then the structure is simple, but the air discharge pressure and suction pressure cannot be adjusted, leading to poor adaptability under varying operating conditions
Solution Approach 1:
The patent introduces adjustable slide valves that can move along the cylinder wall to dynamically change the compression ratio and intermediate pressure. The first slide valve adjusts the first compression ratio by changing the discharge volume of the first stage, while the second slide valve adjusts the second compression ratio. This dynamic adjustment capability allows the system to adapt to varying operating conditions without requiring multiple fixed structures.
Solution Approach 2:
The patent changes key operating parameters (compression ratio, intermediate pressure, discharge pressure) through mechanical adjustment of slide valve positions. By moving the slide valves to different locations, the effective compression volume changes, thereby adjusting the compression ratio and intermediate pressure parameters to match different operating conditions, resolving the contradiction between fixed structure and parameter adaptability.
2Productivity
If the compression ratio and volume ratio are fixed, then the device structure is simple, but the performance efficiency varies under different operating conditions
Solution Approach 1:
The patent incorporates pressure sensors that detect the intermediate pressure and discharge pressure in real-time. These sensors provide feedback signals to a control device, which then adjusts the positions of the slide valves and the rotating speeds of the motors to optimize the compression ratios and maintain efficient operation under varying conditions. This closed-loop feedback control ensures high productivity while managing the complexity through automated control.
Solution Approach 2:
The slide valves serve multiple functions: they act as sealing elements, define compression chambers, and simultaneously serve as adjustment mechanisms for compression ratio control. The motors not only drive the compressors but their speeds are also adjusted as a control variable for optimization. This multi-functionality reduces the need for separate dedicated components, managing complexity while improving efficiency.
3Device complexity
If separate housings are used for first and second compressing rooms, then the structure is simple, but the device occupies more space and has higher complexity
Solution Approach 1:
The patent merges the first and second compressing rooms into a single integrated housing structure. The first and second cylinders are arranged within the same housing, sharing common structural elements and space. This consolidation reduces the overall housing volume compared to separate housings while maintaining the functional separation of the two compression stages through internal partitioning and positioning.
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 design achieves optimal efficiency across varying operating conditions by adjusting motor speeds and slide valve locations, maintaining performance consistency and efficiency.
Implementation Method 1
a first compressor module, including a pair of first screw rods disposed in the first compressing room and mutually engaged, and a first motor disposed in the electric machine room and configured to drive one of the first screw rods to rotate
Data Source
AI summary
A two-stage refrigerant compressor and an operation method thereof are disclosed. The two-stage refrigerant compressor (10) includes: a housing (1); a first compressor module (2) having first screw rods (21) and a first motor (22) driving the first screw rods (21) to rotate; a second compressor module (3) having second screw rods (31) and a second motor (32) driving the second screw rods (31) to rotate; an adjustment mechanism (4) having a first slide valve (41) and a second slide valve (42); a middle pressure sensor (51) configured to acquire a current middle pressure; and a processor configured to receive data of the current middle pressure, control rotating speeds of the first motor (22) and the second motor (32), and control locations of the first slide valve (41) and the second slide valve (42).