Rotary compressor and air conditioner
Solution Overview
Problem
Conventional rotary type compressors face challenges in reducing oil loss and vibration while maintaining efficient operation, often leading to upsizing of the casing to accommodate increased spatial volume.
Innovation Solution
The compressor design incorporates a variable-speed electric motor and a compression mechanism, with specific spatial arrangements and dimensions that satisfy the relationship 0.8≤(A+B)*D2/(Vcc*Nmax)≤1.0, optimizing the volume ratio to reduce oil loss and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the spatial volume in the casing is increased to reduce oil loss, then the rate of oil loss decreases, but the casing size increases
Solution Approach 1:
The patent applies parameter changes by optimizing the volume ratio parameter (A+B)×D2/(Vcc×Nmax) to a specific range (0.70≤volume ratio≤1.10). This parameter optimization allows the compressor to achieve reduced oil loss without increasing casing size, as the mathematical relationship balances the spatial volume (A+B) against the suction volume and maximum rotational speed, enabling compact design while maintaining low oil loss rates.
2Object-affected harmful factors
If the spatial volume in the casing is increased to reduce vibration, then the vibration decreases, but the casing size increases
Solution Approach 1:
The patent uses parameter changes to control vibration by setting the volume ratio (A+B)×D2/(Vcc×Nmax) within the optimal range of 0.70≤volume ratio≤1.10. This parameter optimization ensures that the spatial arrangement and dimensions of the compression mechanism relative to the casing volume create favorable vibration characteristics, reducing harmful vibrations without requiring an oversized casing.
3Volume of stationary object
If the compressor is downsized to reduce casing volume, then the casing size decreases, but oil loss and vibration increase
Solution Approach 1:
The patent overcomes the downsizing limitation through parameter changes by optimizing the volume ratio to 0.70≤(A+B)×D2/(Vcc×Nmax)≤1.10. This mathematical optimization allows compact compressor design where the spatial volume (A+B) is precisely balanced against the suction volume per rotation (Vcc) and maximum rotational speed (Nmax), enabling small casing size while maintaining low oil loss rates and vibration levels that would normally require larger dimensions.
4Volume of stationary object
If the compressor is downsized to reduce casing volume, then the casing size decreases, but vibration increases
Solution Approach 1:
The patent applies parameter changes to achieve vibration reduction in downsized compressors by optimizing the volume ratio parameter to 0.70≤(A+B)×D2/(Vcc×Nmax)≤1.10. This optimization ensures that even in compact designs with reduced casing volume, the spatial relationships between components and the overall volume ratios create favorable vibration characteristics, preventing the vibration increase that would normally accompany downsizing.
Data Source
AI summary
A rotary compressor includes a cylindrical casing, an electric motor, and a compression mechanism. The cylindrical casing has first and second end plates ends in an axial direction. The electric motor is a variable-speed electric motor. The electric motor is disposed in the casing in which a first space is sandwiched between the electric motor and the first end plate. The compression mechanism is disposed in the casing in which a second space is sandwiched between the compression mechanism and the electric motor. The compression mechanism is coupled with the electric motor. The rotational compressor satisfies 0.8≤(A+B)*D2/(Vcc*Nmax)≤1.0. An axial length of the first space is A, an axial length of the second space is B, an inner diameter of the casing is D, a suction volume per rotation of the compression mechanism is Vcc, and a maximum rotational speed of the compression mechanism is Nmax.