Rotary Compressor Roller Groove for Suction Guide
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rotary compressors face challenges in improving volumetric efficiency and reducing suction reaction force while increasing the volume of the compression chamber, which affects the amount of refrigerant sucked and motor efficiency.
Innovation Solution
A rotary compressor design featuring a vane hinged to a roller with a groove on the outer circumferential surface of the roller, where the groove is recessed and axially penetrates, enhancing the compression chamber volume and reducing the suction reaction force by forming a suction guide portion that overlaps with the inlet port during the orbiting motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the volume of the compression chamber is increased, then the volumetric efficiency is improved, but the suction reaction force increases
Solution Approach 1:
The groove is formed at a specific location on the outer circumferential surface of the roller (at the suction chamber side relative to the blade protruding position) to create a localized suction guide portion. This local modification guides the refrigerant flow smoothly into the compression chamber, reducing vortex and reaction force while still increasing the effective suction space, thus improving volumetric efficiency without excessively increasing suction reaction force
Solution Approach 2:
The groove extends in the axial direction of the roller, utilizing the third dimension (axial direction) to increase the suction space volume. By forming a groove that axially penetrates or is recessed from the outer circumferential surface, the patent effectively increases the compression chamber volume and suction capacity without simply enlarging the radial or circumferential dimensions, thereby managing the suction reaction force more effectively
2Quantity of substance
If the volume of the compression chamber is increased, then the amount of refrigerant sucked is increased, but the weight of the drive unit increases
Solution Approach 1:
Instead of uniformly increasing the size of the entire roller or drive unit, the groove is formed only at the specific location on the outer circumferential surface where it is most effective for guiding suction. This localized modification increases the amount of refrigerant sucked while minimizing the additional material required, thus limiting the increase in drive unit weight
Solution Approach 2:
The groove utilizes the axial dimension of the roller to increase the compression chamber volume and refrigerant suction capacity. By extending the groove in the axial direction rather than increasing the roller's radial thickness or overall diameter, the patent effectively increases refrigerant intake while keeping the drive unit weight increase minimal
Data Source
Figure 1
Figure 2
Figure 3(a)~3(f)
AI summary
A rotary compressor includes: a rotational shaft; a bearing plate supporting the rotational shaft; a cylinder coupled to the bearing plate and provided with an inlet port and a vane slot formed along a circumferential direction to be spaced apart by a predetermined distance; a roller coupled to the rotational shaft, provided inside the cylinder to form a compression space together with the bearing plate and the cylinder, and provided with a hinge groove formed on an outer circumferential surface thereof; and a vane having one end slidingly coupled to the vane slot of the cylinder and another end rotatably coupled to the hinge groove of the roller. At least one suction guide portion is provided at the outer circumferential surface of the roller in a recessed manner.