Two-Stage Screw Compressor Axial Layout for Compact Design
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Solution Overview
Problem
Conventional two-stage screw compressors have issues with large size and noise due to coupling interference and inaccurate centering, which affect efficiency, especially in applications requiring low evaporating temperatures and high refrigerating capacity.
Innovation Solution
A two-stage screw compressor design where the drive motor, low-pressure stage screw set, and high-pressure stage screw set are axially arranged on the same side of a transmission gear set, allowing for a compact arrangement and improved space utilization by upgrading the series connection to a parallel configuration, and utilizing a gear drive for torque transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two-stage rotors are connected in series by couplings, then the compressor can achieve two-stage compression, but the unit volume increases and coupling centering accuracy decreases
Solution Approach 1:
The patent merges the two-stage compression system into a single integrated structure where both low-pressure and high-pressure screw sets are mounted on the same crankshaft, eliminating the need for separate couplings and reducing overall unit volume while maintaining two-stage compression capability
Solution Approach 2:
The patent arranges the high-pressure screw set and low-pressure screw set in a nested configuration along the crankshaft, with both sets sharing the same drive source, thereby compacting the overall structure and reducing unit volume
2Power
If two-stage rotors are connected in series by couplings, then the compressor can achieve two-stage compression, but the coupling centering accuracy decreases leading to increased noise
Solution Approach 1:
The patent combines both compression stages into a single crankshaft-driven system, eliminating multiple coupling connections and their associated centering errors, thereby reducing vibration and noise while maintaining effective two-stage compression
3Power
If couplings are arranged in tandem, then two-stage compression is achieved, but the axial length increases
Solution Approach 1:
The patent nests both screw sets along the crankshaft in a compact arrangement, allowing both low-pressure and high-pressure compression to occur within a shorter axial length by sharing the same drive axis rather than requiring sequential tandem coupling arrangement
4Power
If conventional coupling arrangement is used, then two-stage compression is achieved, but space utilization decreases
Solution Approach 1:
The patent merges both compression stages into a single integrated crankshaft system, eliminating the need for separate coupling arrangements and improving space utilization by consolidating components into a more compact configuration
Solution Approach 2:
The patent employs a nested arrangement of screw sets along the crankshaft, optimizing the use of available space within the compressor housing and improving overall space utilization efficiency
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 reduces the axial dimension of the compressor, improves space utilization, and enhances efficiency by minimizing noise and interference, transforming the compressor's shape from a cuboid to a cube, thus improving overall performance.
Implementation Method 1
a transmission gear set for simultaneously transmitting a torque provided by the drive motor to the low-pressure stage screw set and the high-pressure stage screw set
Data Source
AI summary
A two-stage screw compressor and an air conditioning system. The two-stage screw compressor includes: a housing with an intake port and an exhaust port provided thereon; a low-pressure stage screw set axially arranged in the housing and connected to the intake port; a high-pressure stage screw set axially arranged in the housing and connected to the exhaust port; a drive motor axially arranged in the housing; and a transmission gear set for simultaneously transmitting a torque provided by the drive motor to the low-pressure stage screw set and the high-pressure stage screw set; wherein, the drive motor, the low-pressure stage screw set and the high-pressure stage screw set are axially arranged on the same side of the transmission gear set.