Compressor and refrigeration device
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Solution Overview
Problem
Existing refrigeration compressors face reliability issues due to abnormal wear at the matching positions of the main shaft, auxiliary shaft, and eccentric parts, leading to increased volume, cost, and friction loss, which are not effectively addressed by using larger shaft diameters and higher bearings.
Innovation Solution
Incorporating an avoidance part on the crankshaft and connecting structure to create a gap that allows for surface contact and maintains an oil film, even during oblique deformation, enabling the use of smaller axle diameters and reducing friction loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If larger shaft diameter and higher bearing are adopted to ensure reliability of kinematic pairs, then the reliability is improved, but the volume of the compressor is enlarged and the cost is raised
Solution Approach 1:
The patent applies local quality by introducing an avoidance part at specific locations where the crankshaft matches with the connecting structure. This avoidance part creates a localized gap that prevents oblique contact, allowing the crankshaft to maintain proper alignment without requiring uniformly larger shaft diameters throughout. The bearing size can be optimized locally rather than being oversized across the entire component, thus improving reliability while controlling volume.
2Reliability
If larger shaft diameter and higher bearing are adopted to ensure reliability of kinematic pairs, then the reliability is improved, but the cost is raised
Solution Approach 1:
By concentrating the reliability enhancement措施 at specific avoidance parts rather than using larger shafts and bearings throughout, the patent reduces material costs and manufacturing complexity. The avoidance part can be designed as a simple geometric feature that is cost-effective to manufacture while providing the necessary reliability improvement at critical locations.
3Reliability
If larger shaft diameter and higher bearing are adopted to ensure reliability of kinematic pairs, then the reliability is improved, but the friction loss is increased
Solution Approach 1:
The avoidance part creates a localized gap that prevents oblique contact between the crankshaft and connecting structure. This ensures that contact occurs only at the intended bearing surfaces, maintaining proper oil film formation and reducing friction. By preventing misalignment and oblique contact, the patent reduces friction loss without requiring larger bearings that would increase contact area and friction.
4Reliability
If the gap between crankshaft and connecting structure is increased to avoid oblique deformation, then the reliability is improved, but the manufacturing precision requirement is increased
Solution Approach 1:
The avoidance part is designed in advance with predetermined dimensions and positions to pre-establish the necessary gap for accommodating crankshaft deformation. This preliminary design approach allows the gap to be built-in during manufacturing rather than requiring post-manufacturing adjustment, and the gap dimensions can be optimized to balance reliability improvement with manufacturing precision requirements.
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 enhances the reliability of the compressor by preventing wear and reducing volume and cost, while improving performance by ensuring surface contact and maintaining the oil film between the crankshaft and connecting structure.
Implementation Method 1
an oil film between the crankshaft and the connecting structure is not damaged
Data Source
Figure 1
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Figure 3~4
AI summary
A compressor (100) and a refrigeration device. The compressor (100) comprises: a crankshaft (102) and a connecting structure (104) provided on the crankshaft (102); the connecting structure (104) and/or the crankshaft (102) are/is provided with an avoidance part (106), the avoidance part (106) is located at a portion at which the connecting structure (104) fits with the crankshaft (102), and the avoidance part (106) is configured to be suited to avoiding at least one among the connecting structure (104) and the crankshaft (102). The described compressor comprises the crankshaft (102) and the connecting structure (104) connected to the crankshaft (102), and the provision of the avoidance part (106) enables a gap between the crankshaft (102) and the connecting structure (104) to become larger. When the crankshaft (102) is obliquely deformed, the avoidance part (106) can avoid the oblique crankshaft (102), thus the crankshaft (102) and the connecting structure (104) remain in surface contact such that an oil film between the crankshaft (102) and the connecting structure (104) is not damaged, thereby effectively ensuring the reliability of the compressor (100). Therefore, a finer axle diameter and a shorter axle sleeve can be used, thus reducing friction loss at the portion at which the crankshaft (102) fits with the connecting structure (104), and improving the performance of the compressor.