Air injection enthalpy-increasing scroll compressor and refrigeration system
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Solution Overview
Problem
In scroll compressors, the enhanced vapor injection function leads to rapid pressure increases in the compression cavity, causing insufficient back pressure and potential overturning of the orbiting scroll, which reduces compressor efficiency due to lack of normal connection between the guiding passage and the compression cavity.
Innovation Solution
The introduction of a medium pressure passage that connects the compression cavity with the back pressure chamber, guiding medium pressure to the back pressure chamber to prevent scroll separation and ensure axial sealing, thereby increasing back pressure and stabilizing the compressor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If enhanced vapor injection function is activated to raise compression ratio, then compressor performance under high-pressure-ratio conditions is improved, but back pressure becomes insufficient causing orbiting scroll overturning
Solution Approach 1:
The invention segments the pressure management by introducing a dedicated medium pressure passage separate from the guiding passage, allowing independent control of back pressure to the orbiting scroll end plate while maintaining compression cavity pressure for vapor injection
Solution Approach 2:
The medium pressure passage acts as an intermediary channel that transfers medium pressure from the compression cavity to the back pressure chamber, mediating the pressure balance between the compression process and scroll stabilization requirements
2Reliability
If guiding passage connects compression cavity to back pressure space to prevent overturning, then scroll stability is maintained, but during air injection the connection is disrupted causing back pressure loss
Solution Approach 1:
The invention creates two separate pressure management pathways: the original guiding passage for scroll stabilization and the new medium pressure passage for maintaining back pressure during vapor injection, allowing both functions to operate independently without interference
Solution Approach 2:
The medium pressure passage is strategically positioned to connect specific regions of the compression cavity to the back pressure chamber, providing localized pressure support exactly where needed during vapor injection without affecting the overall compression process
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 solution prevents scroll overturning and enhances axial sealing, allowing the compressor to reach a steady state faster and maintain higher efficiency during enhanced vapor injection operations.
Implementation Method 1
the medium pressure passage is configured to connect the compression cavity with the back pressure chamber during a rotation of the orbiting scroll... guiding medium pressure to the back pressure chamber to prevent scroll separation and ensure axial sealing, thereby increasing back pressure
Data Source
AI summary
An air injection enthalpy-increasing scroll compressor is provided. The compressor has a main frame, a movable scroll plate and a stationary scroll plate. The movable scroll plate has a movable plate end plate and a movable scroll wrap arranged on a side end face of the movable plate end plate. A back pressure chamber is defined between the movable plate end plate and the main frame. The stationary scroll plate has a fixed scroll end plate and a stationary scroll wrap arranged on a side end face of the fixed scroll end plate. The stationary scroll wrap and the movable scroll wrap are engaged with each other to form a crescent-shaped compression cavity. The movable scroll plate and the stationary scroll plate are provided with medium pressure passages that, during the rotation of the movable scroll plate, communicate the compression cavity with the back pressure chamber.