Rotary Compressor Spring Holder Pin Assembly
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Solution Overview
Problem
Conventional rotary compressors require a large pressing force to push the spring deep into the spring hole during assembly, resulting in poor assembly workability.
Innovation Solution
The rotary compressor design includes a spring holder pin that crosses the spring hole, allowing the spring to be held in place with less pushing force, facilitating easier assembly by supporting the spring base within the compressor housing after installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring is pushed deep into the spring hole to compress it to nearly solid length, then the spring can be properly secured in the compressor, but a large pressing force is required resulting in poor assembly workability
Solution Approach 1:
A pin is introduced as an intermediary component to secure the spring in place. The pin passes through a through-hole in the cylinder wall and engages with the spring, preventing it from protruding outward. This intermediary mechanism allows the spring to be properly secured without requiring excessive pressing force during assembly, as the pin provides mechanical retention rather than relying solely on spring compression.
Solution Approach 2:
The spring securing function is segmented into two distinct components: the spring itself and the pin. Instead of relying on the spring to perform both compression and retention functions (which would require deep insertion and high force), the retention function is separated and assigned to the pin. This segmentation allows each component to perform its specific function efficiently, improving assembly workability while maintaining reliability.
2Reliability
If the spring is compressed to nearly solid length, then the spring can be properly retained in the cylinder, but the assembly process becomes difficult and time-consuming
Solution Approach 1:
The pin is pre-positioned or easily insertable through the through-hole before final spring installation. This preliminary placement of the retention mechanism allows the spring to be installed without requiring deep compression, as the pin is already in position to provide immediate retention. This preliminary action significantly reduces assembly time and improves productivity.
Solution Approach 2:
The pin serves as a mediator that enables quick spring installation. By having the pin in place through the through-hole, the spring can be installed rapidly without requiring deep compression or excessive force. The intermediary pin bridges the gap between simple spring insertion and secure retention, enabling fast assembly while ensuring reliable spring retention.
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 improves assembly workability by reducing the force needed to install the spring, making the process more efficient and manageable.
Implementation Method 1
The spring pushes the vane from the back against the piston
Implementation Method 2
a pin is inserted in the outer circumference side end of the vane groove to press the outer circumference side end of the spring
Data Source
Figure 1
Figure 2
Figure 3
AI summary
According to one embodiment, a rotary compressor includes a compressing unit (12S, 12T) provided with a cylinder (121S, 121T) having a flared portion (122S, 122T) to provide a vane groove (128S, 128T). In the compressing unit (12S, 12T), a piston (125S, 125T) revolves along a cylinder inner wall (123S, 123T), and an operation chamber (130S, 130T) is formed between the cylinder inner wall (123S, 123T) and the piston (125S, 125T). A vane (127S, 127T) protrudes from the vane groove (128S, 128T) into the operation chamber (130S, 130T) to partition the operation chamber (130S, 130T). A spring inserted in a spring hole presses the back of the vane (127S, 127T). A spring holder pin is inserted in the pin hole (310S, 310T) located on the outer circumferential side of an end of the vane groove (128S, 128T) to prevent the spring from coming off the spring hole when the compressing unit (12S, 12T) is installed in the housing.