Rotary Compressor Suction Pipe Design to Reduce Vibration Transmission
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Solution Overview
Problem
Rotary compressors face challenges in reducing vibrations transferred from the compression mechanism to the accumulator, leading to increased noise and vibration intensity, which affects the efficiency and reliability of the refrigeration cycle.
Innovation Solution
A rotary compressor design featuring a suction pipe with a large diameter portion and a small diameter portion, where the small diameter portion has a smaller outside diameter and is positioned to create a clearance with the joint pipe, made of an iron-based material, to attenuate vibrations, and an iron-based outlet pipe to enhance rigidity and reduce vibration transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the suction pipe is directly connected to the joint pipe, then the structural simplicity is improved, but the vibration transmission from compression mechanism to accumulator increases
Solution Approach 1:
The joint pipe acts as an intermediary component between the suction pipe and the accumulator. By introducing this intermediate structure with specific material properties (iron-based material with high rigidity) and geometric features (cylindrical shape with specific dimensions), vibrations from the compression mechanism are isolated before reaching the accumulator, thus reducing vibration transmission while maintaining structural simplicity.
Solution Approach 2:
The patent changes the material parameter of the joint pipe to iron-based material with high rigidity, and optimizes geometric parameters such as the outer diameter (larger than suction pipe outer diameter) and length of the joint pipe. These parameter changes enable the joint pipe to function as a vibration isolator, reducing the transmission of vibrations from the compression mechanism to the accumulator.
2Ease of manufacture
If the suction pipe has uniform diameter, then the manufacturing simplicity is improved, but the vibration attenuation capability is reduced
Solution Approach 1:
The suction pipe is designed with different diameter portions: a first portion with a first outer diameter and a second portion with a second outer diameter that is smaller than the first outer diameter. This local variation in geometry creates impedance mismatch that attenuates vibrations as they travel through the suction pipe, reducing the intensity of vibrations reaching the accumulator while maintaining ease of manufacture through standard piping configurations.
3Object-affected harmful factors
If the joint pipe is made of flexible material, then the vibration isolation is improved, but the structural strength is reduced
Solution Approach 1:
The joint pipe is made of iron-based material with high rigidity, changing the material parameter from flexible to rigid. This provides the necessary structural strength to withstand operating conditions while the specific geometric parameters (outer diameter larger than suction pipe, specific length) enable it to function as a vibration isolator by reflecting and attenuating vibration waves.
Solution Approach 2:
The system uses a composite structure combining the suction pipe (with varying diameter portions) and the joint pipe (iron-based material with high rigidity). This composite arrangement leverages the different properties of the components: the suction pipe's geometric variation for vibration attenuation and the joint pipe's high rigidity for structural strength and additional vibration isolation.
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
The design effectively reduces vibrations and noise by isolating the small diameter portion of the suction pipe from the joint pipe, resulting in lower sound intensity and reduced peak acceleration of the accumulator, enhancing the compressor's operational efficiency and reliability.
Implementation Method 1
A rotary compressor design featuring a suction pipe with a large diameter portion and a small diameter portion, where the small diameter portion has a smaller outside diameter and is positioned to create a clearance with the joint pipe, made of an iron-based material, to attenuate vibrations
Data Source
AI summary
A rotary compressor includes a casing, a compression mechanism housed in the casing and having a suction port, a joint pipe fixed to the casing and formed into a cylindrical shape, a suction pipe arranged inside the joint pipe and communicating with the suction port, and an accumulator including an outlet pipe connected to an inlet end of the suction pipe. A large diameter portion formed on an inlet side of the suction pipe is fixed to an inner peripheral surface of the joint pipe, and a small diameter portion formed on an outlet side of the suction pipe has a smaller outside diameter than the large diameter portion. The joint pipe is made of an iron-based material. A clearance is formed between an outer peripheral surface of the small diameter portion of the suction pipe and the inner peripheral surface of the joint pipe.