Locating Crankshaft for Scroll Compressor Precision
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Solution Overview
Problem
Existing scroll air compressors face challenges in precise positioning of the orbiting disk during assembly, leading to fit errors between the scroll orbiting and fixed disks, which affects the compressor's performance and limits air compression to low pressure due to deformation caused by heat generation.
Innovation Solution
The implementation of a scroll compressor design featuring a fixed bearing seat, a scroll fixed disk, a scroll orbiting disk, and an orbiting disk bearing seat, with a locating crankshaft system that includes circumferentially positioned bearing bores and a locking nut structure to prevent rotation, along with heat sinks to prevent deformation, ensuring precise alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If auxiliary eccentric shafts are screw connected with nuts for positioning bearings, then the assembly process allows for bearing installation, but the shafts rotate simultaneously when tightening nuts making it difficult to truly tighten them and bearings cannot be located precisely
Solution Approach 1:
The patent applies preliminary action by pre-positioning the auxiliary eccentric shafts using a locating structure (such as a locating groove or positioning feature) before tightening the nuts. This ensures the shafts are already in the correct position, preventing rotation during nut tightening and enabling precise bearing location.
Solution Approach 2:
The patent introduces an intermediary locating structure (such as a locating groove, positioning pin, or reference feature) that acts as a mediator between the shaft and bearing. This intermediary element prevents shaft rotation during assembly and ensures precise bearing positioning without requiring complex tightening procedures.
2Productivity
If the scroll orbiting disk is driven by a crankshaft during air compression, then the compression process is enabled, but heat is generated causing the orbiting disk to deform and creating fit errors between the orbiting disk and bearing
Solution Approach 1:
The patent applies parameter changes by modifying the material properties or geometric parameters of the orbiting disk to compensate for thermal deformation. This may include using materials with lower thermal expansion coefficients, designing compensation features, or adjusting clearances to account for expected thermal growth during compression operation.
Solution Approach 2:
The patent applies beforehand cushioning by incorporating thermal compensation features or pre-setting clearances in the design that account for expected thermal deformation. This cushioning approach prevents fit errors by anticipating and compensating for thermal effects before they occur during compression operation.
3Stress or pressure
If the fit error between the orbiting disk and fixed disk increases due to deformation, then the compressor can only achieve low pressure air compression, but the service performance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the material properties, thermal conductivity, or geometric parameters of the orbiting and fixed disks to maintain consistent fit precision under varying pressure and temperature conditions. This ensures reliable service performance across the full compression pressure range.
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 design simplifies the assembly process, enhances the precision of the scroll compressor's components, prevents deformation due to heat, and allows for high-pressure air compression by ensuring accurate positioning and stability of the scroll disks.
Implementation Method 1
The front end of the locating crankshaft is rotatably connected inside the first bearing bore through the first bearing, and the rear end of the locating crankshaft is rotatably connected inside the second bearing bore through the second bearing
Implementation Method 2
the end on which the locating crankshaft passes through the second bearing is screw connected with a locking nut for locating the second bearing
Implementation Method 3
along with heat sinks to prevent deformation
Data Source
AI summary
A scroll compressor comprises a fixed bearing seat, a scroll fixed disk, a scroll orbiting disk, and an orbiting disk bearing seat. On the orbiting disk bearing seat, there are circumferentially three first bearing bores, and on the fixed bearing seat, there are circumferentially three second bearing bores. The front end of the locating crankshaft is rotatably connected inside the first bearing bore through the first bearing, and the rear end of the locating crankshaft is rotatably connected inside the second bearing bore through the second bearing. There is a through hole on the bottom face of the second bearing bore. The rear end of the locating crankshaft passes through the second bearing and is inserted inside the through hole. In addition, the end on which the locating crankshaft passes through the second bearing is screw connected with a locking nut.