Hermetic Compressor Cylinder Suction Hole Distortion Control
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Solution Overview
Problem
In existing hermetic compressors, the connection of a suction pipe to the cylinder suction hole causes distortion of the cylinder in the circumferential direction due to the expansion of the suction hole, leading to potential deformation of the cylinder and vane groove.
Innovation Solution
The hermetic compressor design includes a cylindrical groove surrounding the cylinder suction hole with a cylinder tubular portion between the suction hole and the groove, allowing the suction pipe to be connected to the outer circumferential surface of the tubular portion, thereby reducing the distortion of the cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the suction pipe is press-fitted directly into the suction hole of the cylinder, then the connection is simple and direct, but the suction hole expands causing the cylinder to be distorted in the circumferential direction
Solution Approach 1:
The suction hole is segmented into two distinct parts: the original suction hole in the cylinder and a separate suction pipe connection hole. This segmentation allows the suction pipe to be connected to the cylinder body without directly expanding the suction hole, thereby preventing circumferential distortion of the cylinder while maintaining a simple connection structure.
2Ease of manufacture
If the suction hole is expanded to connect the suction pipe, then the connection is achieved, but the cylinder and vane groove are deformed
Solution Approach 1:
A separate suction pipe connection hole acts as an intermediary structure between the suction pipe and the cylinder chamber. This intermediary allows the suction pipe to be connected without directly expanding the original suction hole, thereby avoiding deformation of the cylinder and vane groove while maintaining ease of manufacture.
3Productivity
If the suction pipe is connected directly to the cylinder suction hole, then the fluid passage is direct, but pressure loss increases due to cylinder distortion
Solution Approach 1:
By segmenting the suction hole into a separate connection hole in the cylinder body, the cylinder's circumferential distortion is prevented. This maintains the structural integrity of the cylinder and vane groove, ensuring smooth fluid flow and reducing pressure loss, thereby improving overall fluid flow efficiency.
Data Source
AI summary
A hermetic compressor includes a compression mechanism in a hermetic container. The compression mechanism is driven by an electric motor through a rotation shaft, and includes a cylinder including a cylinder chamber having a cylindrical shape. The cylinder has a cylinder suction hole extending in a radial direction of the cylinder and allowing fluid to be sucked into the cylinder chamber. In an outer circumferential surface of the cylinder, a cylindrical groove is formed in such a manner as to surround the cylinder suction hole. Between the cylinder suction hole and the cylindrical groove, a cylinder tubular portion is provided. To an outer circumferential surface of the cylinder tubular portion, a suction pipe or a connecting pipe provided at one end of the suction pipe is connected, the suction pipe being a pipe through which the fluid is guided from outside of the hermetic container to the cylinder chamber.