Scroll Compressor Spiral Passages for Variable Back Pressure
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Solution Overview
Problem
Existing scroll compressors lack a variable back-pressure system that allows for adjustable pressure in the counterpart-pressure chamber, leading to inefficient compression processes and potential performance losses due to excessive contact pressure.
Innovation Solution
Incorporating at least two passages in the positive-displacement spiral, one in the central section and one in the initial region, to create a fluid connection between compression chambers and the counterpart-pressure chamber, enabling a balance between high and low pressures to set the pressure in the counterpart-pressure chamber, thus allowing for a variable back-pressure system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed pressure system is used in the counterpart-pressure chamber, then the structure is simple, but the compression efficiency is reduced due to excessive contact pressure
Solution Approach 1:
The patent implements a dynamic back-pressure system where the counterpart-pressure chamber pressure is no longer fixed but varies with operating conditions. Two passages (first passage in central section, second passage in initial region) enable the pressure to dynamically balance between high-pressure and low-pressure states, allowing the system to adapt to different compression requirements and reduce excessive contact pressure.
Solution Approach 2:
The patent changes the pressure parameter in the counterpart-pressure chamber from a constant value to a variable parameter. By introducing the two passages that connect to different pressure zones, the back-pressure parameter can change based on the compression cycle phase, optimizing the contact pressure between spirals and improving compression efficiency.
2Reliability
If higher back pressure is applied to ensure sealing, then sealing reliability is improved, but energy loss increases due to excessive contact pressure
Solution Approach 1:
The patent optimizes the back-pressure parameter by introducing variable pressure control through two passages. The first passage (central section) and second passage (initial region) allow the counterpart-pressure chamber to maintain appropriate sealing pressure without excessive force, balancing sealing reliability with energy efficiency.
Solution Approach 2:
The system uses the compression process itself to regulate the back-pressure. The passages enable the high-pressure and low-pressure zones to naturally balance the counterpart-pressure chamber pressure, creating a self-regulating sealing mechanism that avoids excessive energy consumption while maintaining reliable sealing.
3Productivity
If a variable back-pressure system is implemented, then compression efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent merges the back-pressure control function with the existing spiral structure by integrating two passages directly into the positive-displacement spiral body. This combination approach achieves variable back-pressure control without adding separate external control systems, minimizing the increase in device complexity while improving compression 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 configuration allows for optimal pressure setting in the counterpart-pressure chamber, reducing contact pressure and enhancing the compression process efficiency by maintaining necessary tightness without performance losses, resulting in a more effective compression process.
Implementation Method 1
enabling a balance between high and low pressures to set the pressure in the counterpart-pressure chamber
Data Source
AI summary
The invention relates to a positive-displacement machine according to the spiral principle, particularly a scroll compressor, having a high-pressure region, which comprises a high-pressure chamber, furthermore having a low-pressure chamber and an orbiting positive-displacement spiral, which engages into a counterpart spiral in such a manner that compression chambers are formed between the positive-displacement spiral and the counterpart spiral, in order to accommodate a working medium, wherein a counterpart-pressure chamber is constructed between the low-pressure chamber and the positive-displacement spiral. According to the invention, the positive-displacement spiral has at least two passages, which at least temporarily produce a fluid connection between the counterpart-pressure chamber and at least one of the compression chambers, wherein a first passage is essentially constructed in a central section of the positive-displacement spiral and at least one second passage is constructed in the initial region of the positive-displacement spiral.