Rotary Compressor Lower End Plate Cover Bulging Portion
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Solution Overview
Problem
The efficiency and vibration suppression of rotary compressors are compromised due to the challenges of optimizing the volume and shape of the lower muffler chamber, which affects refrigerant flow and pressure pulsation, leading to energy loss and reduced performance.
Innovation Solution
A rotary compressor design featuring an annular upper and lower cylinder configuration with an intermediate partition plate, eccentric portions, and a specific arrangement of refrigerant passage holes and discharge valves, including a flat-plate shaped lower end plate cover with a bulging portion to manage refrigerant flow and pressure pulsation effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the lower muffler chamber is made large to reduce pressure pulsation and suppress vibration, then vibration suppression is improved, but refrigerant backward flow increases causing energy loss and efficiency deterioration
Solution Approach 1:
The lower end plate cover is divided into a flat-plate portion and a bulging portion, creating a segmented structure that separates the muffler chamber into distinct functional zones. The flat-plate portion provides structural support while the bulving portion creates a controlled expansion space that reduces pressure pulsation without excessive volume, thereby suppressing vibration while minimizing refrigerant backward flow and energy loss.
Solution Approach 2:
Instead of making the entire lower end plate cover large to reduce vibration, only a local bulving portion is added to create the necessary expansion space. This localized approach provides vibration suppression where needed while keeping the overall chamber volume minimal, preventing excessive refrigerant backward flow and maintaining efficiency.
2Loss of energy
If the lower muffler chamber is made small to improve efficiency and reduce energy loss, then energy loss is reduced, but pressure pulsation increases causing increased vibration
Solution Approach 1:
The bulving portion is formed with a curved, dome-like shape that provides efficient volume expansion in a compact form. This curved geometry creates the necessary space for pressure pulsation reduction while maintaining a small overall chamber volume, thereby suppressing vibration without causing significant refrigerant backward flow and energy loss.
Solution Approach 2:
The bulving portion extends in the vertical dimension (perpendicular to the flat-plate cover), creating additional chamber volume without increasing the horizontal footprint. This dimensional approach allows the muffler chamber to be sufficiently large for vibration suppression while remaining compact overall, preventing excessive refrigerant backward flow.
3Productivity
If multiple refrigerant passage holes are added to improve refrigerant discharge efficiency, then discharge efficiency is improved, but the lower end plate becomes more complex and weaker structurally
Solution Approach 1:
The refrigerant passage holes serve multiple functions: they discharge refrigerant efficiently from the compression chamber to the muffler chamber, and simultaneously reinforce the lower end plate structure by providing structural rigidity. This multi-functionality allows effective refrigerant discharge through multiple holes while maintaining or even enhancing structural strength.
Solution Approach 2:
The lower end plate is designed with sufficient thickness and material properties to recover structural strength despite having multiple holes. The plate's inherent strength is recovered through proper design, allowing multiple discharge holes to be incorporated without compromising overall structural integrity.
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 enhances the efficiency and suppresses vibration of the rotary compressor by ensuring proper refrigerant discharge and reducing pressure pulsation, thereby improving energy consumption efficiency and mechanical strength.
Implementation Method 1
the pressure of the compression chamber that is the uppermost stream of the refrigerant flow is the highest in the compressed high-pressure area, and then the muffler chamber and the inside of the compressor housing, where is the outside of the upper muffler chamber, are high in this order
Data Source
AI summary
A lower end plate includes: bolt holes through which bolts penetrate; a lower discharge valve; a lower discharge-valve accommodating recessed portion into which the lower discharge valve is accommodated; and a lower discharge-chamber recessed portion. A lower end plate cover is provided with a bulging portion. A lower end-plate cover chamber is formed by the lower discharge-valve accommodating recessed portion, the lower discharge-chamber recessed portion, and the bulging portion. Refrigerant passage holes include main refrigerant passage holes provided on the lower discharge-chamber recessed portion, and sub-refrigerant passage holes provided between the bolt hole and the lower discharge-valve accommodating recessed portion away from the lower discharge-valve accommodating recessed portion. The bulging portion is, in a cross section orthogonal to a rotating shaft, formed so as to overlap with at least a part of each of the main refrigerant passage holes and the sub-refrigerant passage holes.