Electric Compressor Casing Layout to Preserve Mounting Leg Accuracy
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Solution Overview
Problem
The integration of the first and second mounting legs with the motor casing in existing electric compressors leads to deformation during stator shrink fitting, compromising the position accuracy of the mounting portion.
Innovation Solution
The electric compressor is structured with a casing divided into a motor casing, compression mechanism casing, and inverter casing, where the mounting legs are provided in the compression mechanism and inverter casings, avoiding heating during stator assembly, thus maintaining position accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mounting legs are provided integrally with the motor casing, then the structure is simplified and manufacturing is easier, but the mounting portion deforms during stator shrink fitting and position accuracy deteriorates
Solution Approach 1:
The casing is divided into separate components: the motor casing and the compression mechanism casing. The mounting legs are provided integrally with the compression mechanism casing rather than the motor casing, so that during stator shrink fitting of the motor casing, the mounting legs are not heated and do not deform, thereby maintaining position accuracy while still achieving an integrated mounting structure
Solution Approach 2:
The mounting legs are extracted from the motor casing and provided in the compression mechanism casing instead. This separation ensures that the mounting portion is not affected by the heating process during stator assembly, preventing deformation and maintaining manufacturing precision
2Ease of manufacture
If the mounting legs are heated during stator shrink fitting, then the stator can be assembled into the motor casing, but the mounting legs deform and position accuracy is compromised
Solution Approach 1:
The casing is segmented into the motor casing and compression mechanism casing as separate components. The mounting legs are provided in the compression mechanism casing, which is not heated during stator shrink fitting of the motor casing, thus allowing stator assembly while preventing mounting leg deformation
Solution Approach 2:
The mounting legs are extracted from the motor casing and provided in the compression mechanism casing. This ensures that the mounting portion is not subjected to heating during stator assembly, eliminating the contradiction between enabling stator assembly and maintaining mounting leg position accuracy
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 structure prevents deterioration in mounting portion position accuracy and enhances stability and durability by distributing the mounting legs across separate casings, ensuring precise and robust attachment to the object.
Implementation Method 1
During the shrink fitting, the motor casing is heated
Data Source
AI summary
To stop deterioration in position accuracy of a mounting portion. An electric compressor 1 includes an electric motor 10, a compression mechanism 20 driven by the electric motor 10, an inverter 30 that drives the electric motor 10, a casing 40 in which the electric motor 10, the compression mechanism 20, and the inverter 30 are housed, and a mounting portion 50 that is formed in the casing 40 and mounts the casing 40 to a predetermined object C. The casing 40 includes a motor casing 41 in which the electric motor 10 is housed, a compression mechanism casing 42 in which the compression mechanism 20 is housed, and an inverter casing 43 in which the inverter 30 is housed. The mounting portion 50 includes a first mounting leg 51 provided in the compression mechanism casing 42 and a second mounting leg (52, 52) provided in the inverter casing 43.