Scroll Compressor Discharge Port Profile Design
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Solution Overview
Problem
Existing scroll compressors experience pressure loss due to fluid backflow when the communication area between compression chambers and the discharge port suddenly increases, leading to inefficiencies in fluid discharge.
Innovation Solution
The scroll compressor design includes a discharge port profile with two sections and an offset portion that gradually increases the communication area as the crankshaft rotates, allowing for a low flow rate discharge initially and preventing backflow by maintaining lower pressures within the compression chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the communication area between compression chambers and discharge port suddenly becomes larger at the moment of communication, then the pressure loss at the discharge port is reduced, but backflow of fluid occurs causing pressure loss
Solution Approach 1:
The discharge port profile is designed to gradually increase the communication area before full communication occurs. The profile includes a first section with a first rate of increase and a second section with a second rate of increase (greater than the first), creating a preliminary discharge phase that prepares the system for full discharge while preventing backflow
Solution Approach 2:
The invention changes the geometric parameters of the discharge port profile to control the rate of area increase. By designing specific curvature radii and profile shapes, the communication area increases at controlled rates, transitioning from a sudden area increase to a gradual, controlled expansion that maintains pressure stability
2Productivity
If the communication area suddenly increases to reduce pressure loss, then discharge efficiency is improved, but fluid backflow occurs leading to re-compression and pressure loss
Solution Approach 1:
The gradual profile design performs preliminary discharge action by slowly increasing the communication area before full discharge. This preliminary phase allows fluid to begin flowing out at a controlled rate, reducing the pressure differential that causes backflow during full discharge
Solution Approach 2:
The invention introduces dynamic control of the communication area through the curved profile design. The area increases dynamically at varying rates (first rate then second rate), adapting the discharge process to maintain optimal pressure conditions and prevent backflow
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A scroll compressor (10) has a fixed scroll (51), a movable scroll (52), a crankshaft (30), and compression chambers (53). The fixed scroll (51) has a discharge port (55) that discharges a fluid from the compression chambers (53). The movable scroll (52) at least partially covers the discharge port (55) and thereby changes a communication area (S) that is the area of a portion of the total area that contributes to communication with the compression chambers. First to third rotation angle positions (θ1 to θ3) become larger in this order. In the first rotation angle position (θ1), the compression chambers (53) and the discharge port (55) start communicating with each other. As the crankshaft (30) rotates from the first rotation angle position (θ1) to the second rotation angle position (θ2), the communication area (S) increases at a first rate of increase (G1). As the crankshaft (30) rotates from the second rotation angle position (θ2) to the third rotation angle position (θ3), the communication area (S) increases at a second rate of increase (G2). The second rate of increase (G2) is greater than the first rate of increase (G1).