Compressor Cylinder Head Sealing via Interlocking Threads
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Solution Overview
Problem
Hermetic compressors in refrigerators experience refrigerant leakage and heat loss due to uneven pressure distribution from screws connecting the cylinder head and valve table, causing gaps and deformation.
Innovation Solution
The compressor employs external and internal screw threads on the cylinder head and body, respectively, which interlock to securely fix the cylinder head to the body, eliminating gaps and ensuring leak-proof sealing, while also providing ease of assembly and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screws are used to connect the cylinder head and valve table, then the components are fixed together, but uneven pressure distribution causes gaps and refrigerant leakage
Solution Approach 1:
A sealing ring is introduced as an intermediary element between the cylinder head and valve table. The sealing ring deforms under screw pressure to fill gaps and prevent refrigerant leakage, resolving the contradiction between connection strength and sealing reliability by providing a dedicated sealing interface that compensates for uneven pressure distribution
Solution Approach 2:
The sealing ring utilizes flexible material properties to adapt to the contact surface between the cylinder head and valve table. The flexible sealing ring deforms under compression to conform to the interface geometry, ensuring reliable sealing even when screw pressure is unevenly distributed across the connection surface
2Ease of operation
If pressure is applied only at screw connection points, then the cylinder head and valve table are secured, but deformation occurs and gaps form between surfaces
Solution Approach 1:
The flexible sealing ring distributes the localized screw pressure across a broader contact area through elastic deformation. This prevents surface deformation and gap formation while maintaining the simplicity of screw-based assembly, resolving the contradiction between ease of operation and manufacturing precision
3Ease of manufacture
If traditional screw connection is used, then assembly is simple, but refrigerant and heat leakage occurs due to gaps
Solution Approach 1:
The sealing ring serves as an intermediary sealing element that prevents refrigerant and heat leakage while maintaining the simple screw connection structure. This resolves the contradiction between assembly simplicity and energy loss by adding a minimal sealing component that eliminates gaps without complicating the assembly process
Solution Approach 2:
The flexible sealing ring creates a thermal and fluid barrier between the cylinder head and valve table, preventing heat and refrigerant leakage while accommodating the simple screw connection geometry. This maintains assembly simplicity while eliminating energy loss through gaps
Data Source
Figure 1
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AI summary
The present invention relates to a compressor (1) comprising a casing (2) carrying the components therein, a cylinder (3) wherein the compression process is performed, a cylinder head (5) disposed on the cylinder (3) and a valve table (6) situated between the cylinder (3) and the cylinder head (5).