Scroll Compressor Relief Hole and Recessed Part Design
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Solution Overview
Problem
Scroll compressors face challenges in efficiently suppressing over-compression loss in both A and B chambers, especially under low-speed/low-pressure ratio conditions, and experience reverse flow losses during high-speed/high-pressure ratio operations due to inadequate compression.
Innovation Solution
A scroll compressor design featuring a shared relief hole and a recessed part on the movable-side plate, divided into a first and second recessed part with a step, allows the second compression chamber to communicate with the discharge port via a gap between the tip of the fixed-side lap and the recessed part before communicating via the side face gap, effectively suppressing over-compression loss in both chambers and maintaining high channel resistance during high-speed/high-pressure ratio operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a shared relief hole is formed on the fixed-side plate, then over-compression loss of the A chamber can be suppressed, but over-compression loss of the B chamber cannot be adequately suppressed
Solution Approach 1:
The invention divides the single shared relief hole into two separate relief holes: a first relief hole for the A chamber and a second relief hole for the B chamber. This segmentation allows each chamber to have dedicated relief pathways optimized for their specific compression characteristics, enabling effective suppression of over-compression loss in both chambers simultaneously.
Solution Approach 2:
The invention implements different relief hole configurations for different chambers: the first relief hole is positioned and sized specifically for the A chamber's needs, while the second relief hole is positioned and sized for the B chamber's needs. This local differentiation ensures that each chamber receives appropriate relief timing and flow characteristics tailored to its specific compression profile.
2Ease of operation
If a concave part is formed in the fixed scroll to communicate the compression chamber with the discharge port, then communication is improved, but large flow volumes occur during high-speed operations leading to reverse flow losses
Solution Approach 1:
The invention extracts the communication function from the fixed scroll's concave part and relocates it to the movable-side plate's recessed part. This extraction allows the communication pathway to be dynamically controlled by the movable scroll's position, enabling precise timing of discharge port communication while maintaining compact channel dimensions that prevent excessive flow volumes and reverse flow losses during high-speed operations.
Solution Approach 2:
The recessed part on the movable-side plate acts as an intermediary structure that mediates between the compression chamber and discharge port. It provides a controlled communication pathway that can be precisely timed through the movable scroll's orbital motion, replacing the fixed concave part's uncontrolled large-opening communication.
Data Source
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AI summary
Provided is a scroll compressor capable of effectively suppressing over-compression loss in both an A chamber and a B chamber. The scroll compressor includes a fixed scroll (40) having a fixed-side plate (41) and a fixed-side lap (42), and a movable scroll (50) having a movable-side plate (51) and a movable-side lap (52). The two laps form a first compression chamber (80) circumscribed by an outer peripheral face (52a) of the movable-side lap and an inner peripheral face (42b) of the fixed-side lap, and a second compression chamber (90) circumscribed by an inner peripheral face (52b) of the movable-side lap and an outer peripheral face (42a) of the fixed-side lap. A discharge port (41c) and a relief hole (47) are formed in the fixed-side plate, the relief hole being shared by the first compression chamber and the second compression chamber and communicating for a predetermined amount of time with each of the first compression chamber and the second compression chamber. A recessed part (56) is formed on a front face (51a) of the movable-side plate and allows the second compression chamber and the discharge port to communicate. The second compression chamber being in a latter stage of compression and the discharge port communicate via a gap between a tip (42c) of the fixed-side lap and the recessed part before communicating via a side face gap between the laps.