Compressor Spring Mounting Structure for Low-Noise Vibration Damping
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Solution Overview
Problem
Refrigerant compressors with drive units mounted using pressure springs face issues with high-frequency vibrations and reduced long-term strength due to excessive stress, leading to increased noise and vibration during start-up and shut-off, requiring over-dimensioning with a safety factor greater than 10 to mitigate these issues.
Innovation Solution
A mounting system where a bolt-shaped section of one mounting element is accommodated within a sleeve-shaped section of another, restricting displacement in all transverse directions and reducing stress on pressure springs, allowing for a more efficient acoustic design and improved vibration damping without compromising long-term strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If pressure springs are used for mounting the drive unit to restrict displacements during start-up and shut-off, then the displacements are restricted, but high-frequency vibrations and noise occur due to spring windings jumping over the spring bolts under great transverse forces
Solution Approach 1:
The patent introduces a guide element as an intermediary component between the spring element and the mounting elements. This guide element has a guide section with a guide gap that laterally guides the spring element, preventing it from jumping over the mounting elements while allowing axial compression. The guide element mediates the interaction between the spring and mounting elements, restricting harmful lateral movements without compromising the vibration damping function.
Solution Approach 2:
The guide element provides localized guidance only in the region where the spring element interacts with the mounting elements. The guide gap is positioned to allow the spring element to move axially while preventing lateral displacement. This local quality approach ensures that the spring element is constrained only where necessary, maintaining its vibration damping capability while preventing harmful jumping movements.
2Reliability
If the spring element is over-dimensioned with a safety factor greater than 10 to prevent individual windings from jumping, then the long-term strength is improved, but the vibration damping capability is reduced due to increased transverse stiffness
Solution Approach 1:
The guide element serves as a mediator that prevents spring windings from jumping over the mounting elements without requiring the spring element to be over-dimensioned. By providing lateral guidance through the guide gap, the guide element allows the use of spring elements with lower transverse stiffness that can effectively damp vibrations while maintaining reliability through the mechanical guidance system.
Solution Approach 2:
The mounting system is segmented into distinct functional components: the spring element for vibration damping, the mounting elements for structural support, and the guide element for lateral constraint. This segmentation allows each component to be optimized for its specific function, with the spring element having lower transverse stiffness for better vibration damping while the guide element provides the necessary lateral constraint to prevent winding jump.
3Object-generated harmful factors
If the spring element is surrounded by a vibration-absorbing element composed of viscoelastic material, then noise damping is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the noise damping function from a separate viscoelastic material layer and integrates it into the guide element itself. The guide element is designed with a guide section that laterally guides the spring element, and this guiding structure itself provides the noise damping function. This eliminates the need for an additional surrounding vibration-absorbing element, reducing device complexity while maintaining noise damping performance.
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 solution reduces noise and vibration by allowing the use of springs with lower transverse stiffness, minimizing stress, and enabling a smaller housing volume while maintaining mechanical stability and long-term strength, effectively addressing the limitations of existing technologies.
Implementation Method 1
a first mounting element (5) and a second mounting element (7) are provided; wherein one of the two mounting elements is connected with the drive unit (6) and the other one of the two mounting elements is connected with the mounting region (2)... wherein the first mounting element and/or the second mounting element is/are surrounded by at least one spring element (1)
Data Source
AI summary
A refrigerant compressor includes a hermetically sealed housing and includes a drive unit; wherein the drive unit is arranged in the interior of the housing and is attached, by way of at least one spring element, to at least one mounting region of the housing with mounting action; wherein a first mounting element and a second mounting element are provided; wherein one of the two mounting elements is connected to the drive unit and the other of the two mounting elements is connected to the mounting region. The first mounting element is of sleeve-like form and has an inner wall, and the second mounting element has a bolt-like section, wherein the bolt-like section is received at least in sections in the first mounting element, whereby an overlap region is formed, in which overlap region a gap is formed between the bolt-like section of the second mounting element and the inner wall of the first mounting element.


