Compressor Rotor Through-Hole Structure for Low Oil Discharge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The efficiency of refrigeration cycle systems is reduced due to increased flow path resistance when refrigerator oil passes through through-holes in a compressor, leading to decreased refrigerant flow rates and oil discharge issues.
Innovation Solution
A compressor design featuring a rotor with V-shaped through-holes and end plates that expose inner peripheral regions to the internal space, reducing flow path resistance and oil discharge by separating oil from refrigerant through projection portions and biforked tip end portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If projection portions are provided to separate refrigerator oil from refrigerant, then oil discharge is reduced, but flow path resistance increases and refrigerant flow rate decreases
Solution Approach 1:
The end plate is designed with differentiated regions: a first region with projection portions for oil separation and a second region without projections for maintaining refrigerant flow. This local quality differentiation allows the projection portions to be positioned only where needed for oil separation, preventing them from obstructing the main refrigerant flow path and thus resolving the contradiction between oil discharge reduction and refrigerant flow rate maintenance.
2Loss of substance
If projection portions cover the entire end plate, then oil separation is improved, but flow path resistance increases significantly
Solution Approach 1:
The end plate is segmented into functionally distinct regions: a first region containing projection portions for oil separation and a second region without projections for efficient refrigerant flow. This segmentation allows the projection portions to be confined to a limited area where they can effectively separate oil without creating excessive flow path resistance across the entire flow path, thus resolving the contradiction between oil separation effectiveness and flow path resistance.
3Productivity
If the region closer to the rotation axis is exposed to internal space, then refrigerant flow efficiency is maintained, but oil discharge increases
Solution Approach 1:
The end plate design creates local quality differences by providing projection portions in a first region to capture and retain refrigerator oil, while exposing a second region closer to the rotation axis to the internal space to maintain refrigerant flow efficiency. The projection portions act as local oil traps that prevent oil from being discharged with the refrigerant, while the exposed region ensures smooth refrigerant flow, thus resolving the contradiction between refrigerant flow efficiency and oil discharge control.
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
The compressor effectively reduces oil discharge while maintaining high refrigerant flow efficiency, suppressing pressure loss and enhancing the overall performance of the refrigeration cycle.
Implementation Method 1
The motor part (electric motor part) includes a stator and a rotor. The stator generates a rotating magnetic field to rotate the rotor.
Implementation Method 2
The compressor part compresses refrigerant as the rotor is rotated.
Implementation Method 3
a plurality of projection portions that cover a region of the other end of the hole distant from the rotation axis are formed
Data Source
AI summary
A rotor that gives rotational power to a compressor part that compresses refrigerant has a rotor core in which through-holes through which the refrigerant passes are formed, the through-holes having a cross section with a plurality of forks in a direction away from a rotation axis, a first end plate that covers a first end surface where one end of both end portions of the through-holes of the rotor core closer to the compressor part is formed, and an upper rotor end plate that covers a lower rotor end surface where the other end of the plurality of holes of the rotor core is formed. The first end plate has a first opening portion that causes the through-holes to communicate with an internal space. The upper rotor end plate has an upper opening portion that causes the through-holes to communicate with the internal space. The upper rotor end plate has projection portions that cover tip end portions, which are divided to respective forks, of the through-holes.