Compressor Rotor End Plate Openings Reduce Channel Resistance
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Solution Overview
Problem
Hermetic compressors face increased channel resistance when refrigerant passes through rotor through-holes, leading to decreased efficiency of the refrigeration cycle.
Innovation Solution
The compressor design includes a rotor with a rotor core having through-holes, where the rotor core is covered by end plates with openings that expose areas closer to the rotation axis, allowing direct communication between the through-holes and the internal space, reducing channel resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the refrigerating machine oil is inhibited from passing through the through-holes, then the refrigerating machine oil stored in the hermetic container is prevented from decreasing, but the channel resistance when the refrigerant passes through them increases
Solution Approach 1:
The end plates are segmented with multiple openings distributed across their surfaces, allowing the refrigerant to pass through multiple paths rather than a single channel, thereby reducing overall channel resistance while still controlling oil passage
Solution Approach 2:
The solution transitions from a single-dimensional through-hole path to a multi-dimensional flow path by creating openings at different locations and orientations in the end plates, allowing refrigerant to access through-holes from multiple directions and reducing flow resistance
2Reliability
If the channel resistance increases, then the refrigerating machine oil can be retained, but the efficiency of the refrigeration cycle apparatus decreases
Solution Approach 1:
The end plates are designed with openings positioned to guide refrigerant flow into the through-holes before the refrigerant reaches the oil storage area, preliminarily establishing efficient flow paths that reduce resistance while maintaining oil retention functionality
Solution Approach 2:
The openings in the end plates act as intermediary channels that facilitate smooth transition of refrigerant into the through-holes, mediating between the compression chamber and the through-hole passages to reduce turbulence and resistance
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 reduces channel resistance and pressure loss, enhancing the efficiency of the refrigeration cycle by allowing smoother refrigerant flow and minimizing the discharge of refrigerating machine oil.
Implementation Method 1
The motor unit includes a stator and a rotor. The stator rotates the rotor by generating a rotating magnetic field.
Implementation Method 2
The compressor unit compresses a refrigerant by rotation of the rotor.
Data Source
AI summary
The compressor includes a rotor that applies rotational power to a compressor unit, wherein the rotor includes a rotor core and an upper rotor-end plate, the rotor core has a plurality of through-holes through which a refrigerant passes, the upper rotor-end plate covers the upper rotor-end face of the rotor core, where one end of each of the plurality of through-holes is formed, the upper rotor-end plate has a plurality of upper openings that allow communication of the plurality of through-holes with an internal space in a compressor container, the plurality of upper openings are adjacent to the plurality of through-holes in the upper rotor-end face, and a plurality of upper inner peripheral-side adjacent areas, which are on the inner peripheral-side closer to a rotation axis than the plurality of through-holes, are exposed to the internal space.