Rotary Compressor Suction Passage Design for Pressure Loss Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rotary compressors experience significant pressure loss during refrigerant suction due to vortex formation and flow disruptions at the suction hole, which current configurations fail to adequately address.
Innovation Solution
The design incorporates a suction passage with a cylindrical first passage and a slit-like second passage that penetrates through the cylinder, with specific dimensions and orientations to minimize vertical flow disruptions and pressure losses, including L≥W1, W1≤D1×0.7, and W2≤D1, to align and stabilize refrigerant flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a suction hole extending in the radial direction is used, then the structure is simple, but pressure loss occurs due to vortex formation and flow disruption
Solution Approach 1:
The suction hole is divided into two distinct passages: a first passage extending in the radial direction and a second passage extending in the vertical direction. This segmentation allows the refrigerant flow to be separated into radial and vertical components, preventing vortex formation while maintaining structural simplicity. The first passage handles radial flow entry while the second passage directs vertical flow, eliminating the harmful flow disruption that occurs in a single radial passage.
2Loss of energy
If a cutout portion is formed at the suction hole opening, then flow change is prevented, but the cutout portion is not deep enough to sufficiently reduce pressure loss
Solution Approach 1:
Instead of merely widening the opening in the circumferential direction (horizontal dimension), the invention extends the suction hole structure in the vertical dimension by creating a second passage that penetrates through the cylinder in the vertical direction. This dimensional extension allows the refrigerant to change flow direction gradually from radial to vertical without abrupt changes at the opening, effectively reducing pressure loss while managing the complexity through a systematic multi-pass passage design.
3Loss of energy
If the second passage is made wide to reduce flow resistance, then pressure loss decreases, but the structural constraints L≥W1 and W1≤D1×0.7 must be satisfied
Solution Approach 1:
The invention optimizes the geometric parameters of the second passage by establishing specific dimensional relationships: the length L must be greater than or equal to the width W1 (L≥W1), and the width W1 must be no more than 70% of the first passage diameter D1 (W1≤D1×0.7). These parameter constraints ensure that the passage maintains adequate flow capacity while preventing excessive width that would compromise structural integrity or manufacturing feasibility. The aspect ratio control (L/W1≥1) ensures laminar flow characteristics and reduces turbulence.
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 configuration reduces pressure loss and improves compression efficiency by preventing flow disruptions and refrigerant backflow, enhancing the overall performance of the rotary compressor.
Implementation Method 1
a second passage whose one end is connected to the first passage and other end has an opening on the inner circumference of the cylinder, and the second passage is formed, from the one end to the other end, in a slit-like shape penetrating an upper side and a lower side of the cylinder
Data Source
AI summary
A suction passage includes: a first passage that is cylindrical and connected to a suction unit; and a second passage whose one end is connected to the first passage and other end has an opening on the inner circumference of a cylinder. The second passage is formed, from its one end to the other end, in a slit-like shape penetrating the upper side and the lower side of the cylinder, and satisfies L≥W1, W1≤D1×0.7, W2≤D1 where the width of the second passage at the other end in a circumferential direction of the cylinder is W1, the width of the second passage at the one end is W2, the length of the second passage from the one end to the other end is L, and the inner diameter of the first passage at an area connected to the second passage is D1.