Crankshaft, compressor, and refrigeration device
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Solution Overview
Problem
Existing crankshafts for refrigeration compressors require complex manufacturing processes and high costs due to the need for different eccentricities and shaft diameters, leading to low standardization and poor oil supply efficiency.
Innovation Solution
A crankshaft design featuring independent first and second shafts with integrated crank arms and recessed portions for oil channel communication, allowing adjustable eccentricity and improved lubrication through direct oil channel alignment and storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If crankshafts with different eccentricities and shaft diameters are designed to meet displacement requirements, then the compressor can accommodate varying displacement needs, but new die sinking is required for each design, causing low standardization and poor versatility of molds, and increasing manufacturing costs
Solution Approach 1:
The crankshaft is divided into multiple modular components including a first shaft, a second shaft, a first crank arm, and a second crank arm that can be independently manufactured and then assembled. This segmentation allows each module to be produced using standardized processes while the overall assembly can be configured for different displacement requirements through varying eccentricities and shaft diameters, eliminating the need for new die sinking for each design variation.
Solution Approach 2:
The modular crankshaft components are designed with universal interfaces and standardized features that allow the same basic modules to be reused across different compressor configurations. By assembling different combinations of shafts and crank arms with varying eccentricities, a single set of standardized modules can serve multiple displacement requirements, improving mold versatility and reducing manufacturing costs.
2Reliability
If oil supply channels are formed on the outer surface of the casted crankshaft, then lubrication is provided, but the manufacturing process becomes complicated and the oil loading effect is poor
Solution Approach 1:
The oil supply system is segmented into separate oil channels formed within the modular crankshaft components rather than being created on the outer surface of a monolithic cast crankshaft. Each module can have its oil channels pre-formed during manufacturing, simplifying the overall process and improving oil loading effectiveness.
Solution Approach 2:
The modular crank arm components act as intermediaries that facilitate oil supply to the crankshaft journals. Oil channels are integrated into these modular components, allowing oil to be delivered efficiently to bearing surfaces without requiring complex surface machining or poor-loading external channels.
Data Source
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AI summary
Provided is a crankshaft (100), including: a first shaft (110), a second shaft (130), a first crank arm (120), a second crank arm (140), and a recessed portion (121). The first crank arm (120) is disposed at one end of the first shaft (110) and has a first oil channel (111) provided therein, and the first oil channel (111) penetrates through the first shaft (110); the second crank arm (140) is disposed at one end of the second shaft (130) and has a second oil channel (131) provided therein, and the second oil channel (131) penetrates through the second shaft (130); and the recessed portion (121) is disposed on an end surface of the first crank arm (120) facing away from the first shaft (110) or on an end surface of the second crank arm (140) facing away from the second shaft (130), and the second crank arm (140) is configured to be connected to the first crank arm (120) in such a manner that the first oil channel (111) and the second oil channel (131) are in communication with each other via the recessed portion (121). The recessed portion (121) stores lubricating oil and supplies the oil to the second oil channel (131), which improves the oil supply effect. The relative positions of the second shaft (130) and the first shaft (110) can be adjusted according to an actual displacement requirement of a compressor so as to adjust the eccentricity, such that the crankshaft can adapt to displacement requirements of different compressors and the manufacture thereof is easy. The present disclosure also relates to a compressor including the crankshaft and a refrigeration device including the compressor.