Scroll Compressor Assembly with Back Pressure Sealing
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Solution Overview
Problem
The existing assembly methods for scroll compressors face challenges in efficiently sealing the compression chamber while minimizing friction, leading to issues with refrigerant leakage and vibration due to the complexity and deformation of components during the assembly process.
Innovation Solution
A simplified assembly method is introduced, where the fixed scroll is coupled to the main frame using a plurality of coupling members and reference pins, allowing for simultaneous alignment and coupling, reducing deformation and twisting, and enhancing the sealing effect by utilizing a vertically movable fixed scroll with a back pressure chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the end of the wrap and the surface of the head plate are strongly attached to each other, then leakage is prevented, but friction increases causing noise and abrasion
Solution Approach 1:
The patent changes the pressure parameter by introducing a back pressure chamber that maintains a specific pressure range (higher than suction pressure but lower than discharge pressure). This pressure adjustment allows the wrap end to be sufficiently attached to the head plate for sealing while preventing excessive friction, noise, and abrasion that would occur with stronger attachment.
2Device complexity
If a back pressure chamber is formed on the bottom surface of the orbiting scroll, then the structure is simplified, but the orbiting scroll becomes tilted causing vibration and noise
Solution Approach 1:
The patent changes the pressure distribution parameter by strategically positioning the back pressure chamber and configuring bypass holes to create a pressure balance. This pressure balancing prevents tilting of the orbiting scroll, eliminating vibration and noise while maintaining the simplified structural advantage of having the back pressure chamber on the bottom surface.
3Strength
If multiple coupling members are assembled sequentially, then the fixed scroll is securely coupled to the main frame, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-assembling the coupling members onto the fixed scroll before mounting the entire assembly to the main frame. This preliminary configuration ensures proper alignment and secure coupling while significantly reducing the complexity and time of the final assembly process, thereby improving productivity without compromising coupling strength.
4Reliability
If the fixed scroll is made movable to allow close attachment, then sealing is improved, but deformation and twisting occur during assembly
Solution Approach 1:
The patent changes the pressure parameter by utilizing the back pressure chamber to apply controlled pressure that enables the fixed scroll to move and attach closely to the orbiting scroll for improved sealing. The controlled pressure ensures that the movement achieves adequate attachment without causing excessive deformation or twisting of the scroll components.
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 method simplifies the assembly process, improves productivity, and effectively seals the compression chamber, reducing refrigerant leakage and vibration, while maintaining the structural integrity of the scroll compressor components.
Implementation Method 1
a back pressure chamber having an intermediate pressure, which is defined as a value between a discharge pressure and a suction pressure, may be formed in or at a back surface of the orbiting scroll or the fixed scroll
Data Source
AI summary
A scroll compressor and a method for assembling a scroll compressor are provided. The scroll compressor may include a casing including a rotational shaft, a main frame coupled to an inside of the casing, a first scroll that revolves due to rotation of the rotational shaft, the first scroll being supported by the main frame, and a second scroll disposed on or at a side of the first scroll to define a plurality of compression chambers together with the first scroll. The second scroll may include a head plate including a wrap, and at least one coupling guide that extends from the head plate. The at least one coupling guide may include a first reference pin coupling hole, into which a reference pin may be inserted, and a guide hole, into which a coupling member may be inserted.