Compressor Container Fixation via Heated Convex Portions
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Solution Overview
Problem
Conventional compressor technologies face issues such as foreign material contamination, refrigerant leakage, increased strain on compressor mechanisms, rickety installations leading to noise and vibration, and long-term reliability problems due to inadequate fixation methods.
Innovation Solution
A compressor design featuring a cylindrical container with built-in parts fixed through a clearance fit, using pairs of prepared holes on the outer peripheral face and heated convex portions formed on the inner face to clamp the parts when cooled, reducing strain and enhancing clamping force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If holes are made through the container for fixing the compressor mechanism section, then the compressor mechanism section can be fixed to the container, but foreign materials such as welding sputters are mixed into the container through the holes during welding, causing defective compression or refrigerant leakage
Solution Approach 1:
The invention extracts the harmful element (holes through the container) from the fixation process. Instead of making holes through the container wall, the compressor mechanism section is fixed by pressing the container wall inward at specific positions to form convex portions that engage with recesses on the compressor mechanism section, eliminating the need for penetrating holes and thus preventing foreign material contamination during welding
Solution Approach 2:
The invention introduces an intermediary structure (convex portions formed by deforming the container wall) that mediates between the container and the compressor mechanism section. These convex portions act as intermediate fixing elements that provide secure attachment without requiring holes through the container, thus avoiding the contamination problem while maintaining fixation reliability
2Strength
If melt metal is flown into the hole portion of the container during welding, then the container is heated and expands, but after cooling contraction occurs and the coagulated melt metal presses the compressor mechanism section, increasing strain
Solution Approach 1:
The invention removes the hole structure from the fixation system, eliminating the pathway for melt metal to enter and the subsequent thermal expansion-contraction cycle that causes strain on the compressor mechanism section, while still achieving strong fixation through the deformed container wall convex portions
3Object-affected harmful factors
If the compressor mechanism section is press-fitted into the container without holes, then no foreign material contamination occurs, but force clamping the compressor mechanism section increases, causing strain in the compressor mechanism section
Solution Approach 1:
Instead of uniform press-fitting across the entire container surface, the invention applies localized deformation at specific positions to form convex portions. This local quality approach concentrates the clamping force at discrete engagement points rather than distributing it uniformly, reducing overall strain on the compressor mechanism section while maintaining secure fixation without holes
4Force
If the container wall is pressed inward to form convex portions for clamping, then strong clamping force is achieved, but the container wall must be heated to reduce forming force, which may affect surrounding components
Solution Approach 1:
The invention segments the heating process to affect only the localized region where convex portions are formed, rather than heating the entire container. This localized heating approach reduces the total thermal energy required and minimizes thermal impact on surrounding components while still providing enough thermal softening to reduce the force needed for forming the convex portions
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 approach minimizes strain on compressor mechanisms, prevents refrigerant leakage, and ensures long-term reliability by providing a strong and stable fixation that withstands operational forces without causing noise or vibration.
Implementation Method 1
positions of the container wall including positions corresponding to positions of the pair of prepared holes is heated so as to form pair of convex portions on the inner peripheral face of the container wall
Implementation Method 2
forming a fixing section constituted by the pair of convex portions clamping a part between the pair of prepared holes when the region cools down
Data Source
AI summary
There is provided a high performance compressor that causes no possibility of mixing foreign materials or of leaking refrigerant, that reduces strain otherwise generated in a compressor mechanism section and that is highly reliable even for a long-term use. The compressor mechanism section in which pairs of prepared holes are formed at a plurality of points on an outer peripheral face thereof is disposed within the closed container. Caulking punches are positioned to positions corresponding to those of the prepared holes and a region including the corresponding positions is heated. Then, when the punches are driven by pressing machines, portions of the container wall of the closed container plastically deform as the convex portions and enter the prepared holes. When the container wall cools down, the pair of convex portions of the container clamps a part between the prepared holes.