Compressor Centroid Positioning to Reduce Vibration and Pipe Stress
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Solution Overview
Problem
The existing double anti-vibration structure for heat pump compressors, where the compressor is disposed away from the center of vibration, results in large centrifugal forces and increased loads on pipes, leading to stress and potential breakage of connection pipes during vibration.
Innovation Solution
The compressor is positioned close to the arrangement centroid of the second elastic members, with specific geometric constraints ensuring the compressor and elastic members are disposed such that the centrifugal force, shear force, and stress on the compressor connection pipe are minimized by aligning the compressor with the centroid of the second elastic members, reducing the radius of the circle encompassing the arrangement centroid of the second elastic members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the compressor is disposed away from the center of vibration of the support member, then the vibration transmission is reduced, but a large centrifugal force acts on the compressor and pipes are subjected to a large load
Solution Approach 1:
The patent introduces a support member as an intermediary component between the compressor and the housing. The support member includes vibration damping portions that act as mediators to reduce vibration transmission while supporting the compressor. This intermediary structure allows the compressor to be positioned away from the housing center (reducing vibration transmission) while the support member compensates for the increased centrifugal force through its damping capabilities.
Solution Approach 2:
The vibration damping portions of the support member are configured to provide both mechanical support and vibration damping functions. The support member structure combines load-bearing capability with vibration attenuation properties, allowing it to handle both the centrifugal forces generated by offset compressor placement and the vibration transmission reduction requirement simultaneously.
2Object-generated harmful factors
If the compressor is disposed away from the center of vibration of the support member, then the vibration transmission is reduced, but pipes are subjected to a large load
Solution Approach 1:
The support member serves as an intermediary that protects the pipes from excessive loads. By positioning the compressor away from the housing center and using the support member with vibration damping portions, the system reduces direct vibration transmission to the housing while the support member absorbs and dampens the forces that would otherwise be transmitted to the pipes, preventing excessive pipe loading.
3Force
If the compressor is positioned close to the arrangement centroid of the second elastic members, then the centrifugal force and shear force are reduced, but the complexity of determining the optimal position increases
Solution Approach 1:
The patent defines specific geometric parameters and relationships to determine the optimal compressor position. By establishing criteria based on the arrangement centroid of the second elastic members and defining the position P relative to this centroid, the complex optimization problem is transformed into a parameter-based design approach. The position is determined by satisfying specific geometric conditions rather than through complex iterative optimization.
Solution Approach 2:
The arrangement centroids of the first and second elastic members are determined in advance during the design phase. By pre-calculating these reference positions and using them to define the compressor placement criteria, the complex position optimization is performed beforehand. This preliminary determination of reference points simplifies the actual compressor positioning process during assembly.
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 the centrifugal force, shear force, and stress on the compressor connection pipe, stabilizing the compressor and reducing the likelihood of pipe breakage and noise transmission, thereby enhancing the refrigeration cycle apparatus's operational stability and noise reduction.
Implementation Method 1
a first anti-vibration member (23) and a second anti-vibration member (24)
Data Source
AI summary
A refrigeration cycle apparatus has a compressor disposed via a bottom member of a housing, second elastic members, a base, and first elastic members. The compressor is disposed close to an arrangement centroid of the second elastic members.