Scroll Back Pressure Structure for Better Suction-Discharge Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing scroll compressor designs suffer from poor sealing performance between the back pressure plate and the stationary scroll plate, leading to refrigerant leakage and reduced compression efficiency due to the arrangement of the back pressure plate at the top of the stationary scroll plate, which affects the sealing performance and connectivity between the discharge and suction chambers.
Innovation Solution
A scroll structure design with a recess on the second scroll plate to accommodate the back pressure plate, a floating plate covering the gap between the back pressure plate and the recess side wall, and through holes for communication with the intermediate pressure chamber, enhancing the sealing performance by allowing the floating plate to be pressed towards the first scroll plate under pressure from the intermediate pressure chamber, thus improving the sealing and compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the back pressure plate is arranged at the top of the stationary scroll plate, then the adhesion between scroll plates can be ensured, but the sealing performance at the communication position becomes poor
Solution Approach 1:
The back pressure plate is divided into multiple sections with independent sealing structures. Each section has its own sealing ring that can independently seal the communication positions, allowing the plate to maintain both structural strength and effective sealing across multiple locations.
Solution Approach 2:
Sealing rings are introduced as intermediary elements between the back pressure plate and the stationary scroll plate. These sealing rings specifically address the sealing issue at communication positions without affecting the overall adhesion function of the back pressure plate.
2Device complexity
If connecting points between the back pressure plate and stationary scroll plate are far away from each other, then the structural design is simplified, but the sealing performance of the sealing ring is affected
Solution Approach 1:
Instead of relying on a single sealing ring spanning large distances between connecting points, the sealing function is segmented into multiple independent sealing rings at different communication positions. This maintains sealing effectiveness while allowing connecting points to be positioned for structural simplicity.
Solution Approach 2:
Sealing capability is enhanced locally at each communication position through dedicated sealing rings, rather than requiring uniform sealing across the entire back pressure plate. This allows connecting points to be positioned optimally for structural reasons while maintaining local sealing quality where needed.
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
The improved sealing performance reduces refrigerant leakage and enhances compression efficiency by ensuring tight connections between the scroll plates, simplifying the sealing structure, and reducing production costs while maintaining consistent compression effects.
Implementation Method 1
when the first scroll plate and the second scroll plate carry out compression, pressure in the intermediate pressure chamber will be applied to the back pressure chamber 282' to push the floating plate 240'
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided are a scroll structure and a compressor. The scroll structure includes: a first scroll plate; a second scroll plate matching the first scroll plate, where the first scroll plate and the second scroll plate can move relative to each other, a recess is provided at one end of the second scroll plate facing away from the first scroll plate, and a first through hole is provided on the second scroll plate; a back pressure plate arranged in the recess, where a gap is provided between the back pressure plate and a side wall of the recess; and a floating plate movably arranged on the back pressure plate, where the floating plate covers the gap, a first chamber is formed among the second scroll plate, the back pressure plate and the floating plate, and the first through hole is in communication with the first chamber. According to the scroll structure provided in the present disclosure, since the back pressure plate is arranged in the recess of the second scroll plate, an outer wall of the entire second scroll plate is integrated, further sealing performance between a discharge chamber and a suction chamber is enhanced, and compression efficiency is further improved.