Compressor Piston Suction Port Geometry for Miniaturized Compression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional linear compressors face reduced compression efficiency due to decreased cross-sectional area of suction ports and increased stiffness of suction valves as the piston diameter miniaturizes, leading to poor response characteristics and leakage issues.
Innovation Solution
The design of the piston includes a cylindrical slider with a head having an inner and outer body, where the suction port is formed between them, with bridges connecting the bodies and a suction valve that can open and close the port, optimizing the shape to increase the effective cross-sectional area and reduce flow path resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the piston diameter is miniaturized, then the compressor size is reduced, but the cross-sectional area of the suction port decreases and the suction valve stiffness increases
Solution Approach 1:
The suction port is redesigned from a conventional circular cross-section to an elliptical cross-section. This dimensional change in shape allows the effective cross-sectional area to be increased without increasing the piston diameter, thereby maintaining the suction port area despite miniaturization of the compressor.
Solution Approach 2:
The shape parameters of the suction port are changed from a circular geometry to an elliptical geometry with optimized major and minor axes. This parameter change increases the effective cross-sectional area (Ss) while keeping the piston diameter small, directly addressing the contradiction between miniaturization and maintaining suction performance.
2Strength
If the opening part length is shortened, then the suction valve stiffness increases, but the response characteristics deteriorate
Solution Approach 1:
The length parameter of the opening part is optimized to a specific range (0.5-2.0 times the piston diameter) to achieve the desired balance between stiffness and response characteristics. This parameter optimization allows the valve to maintain adequate stiffness while preserving sufficient response capability.
3Volume of moving object
If the cross-sectional area of suction ports decreases, then the piston size is reduced, but the discharge flow rate decreases
Solution Approach 1:
The suction port cross-section is changed from circular to elliptical, utilizing the dimensional advantage of the ellipse to provide a larger effective area (Ss) within the constrained piston diameter. This shape transformation directly increases the discharge flow rate capability without increasing piston size.
Solution Approach 2:
The elliptical cross-section with optimized curvature ratios (major axis to minor axis ratio between 1.2-2.0) provides improved flow characteristics and larger effective area compared to a circular section of the same bounding diameter, thereby maintaining productivity during miniaturization.
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 configuration enhances the compression efficiency, improves the durability of the suction valve, and prevents refrigerant leakage, while maintaining the miniaturized piston size by optimizing the suction port shape and valve operation.
Implementation Method 1
a suction valve configured to be coupled to the front of the head and to be capable of opening and closing the suction port
Implementation Method 2
a compressor which compresses and discharges refrigerant suctioned into a cylinder
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A piston (200) for a compressor (100) and a compressor (100) including the same are disclosed. The piston (200) compresses and discharges refrigerant suctioned into a cylinder (140), and the piston (200) includes a cylindrical slider (220) having an outer diameter corresponding to an inner diameter of the cylinder (140) and forming a suction space (102) in which the refrigerant suctioned in the cylinder (140) is received; and a head (210) which is configured to be coupled to the slider (220), in which a compression space (103) is provided in the front and a suction space (102) is provided in the rear, and in which a suction port (214) communicating with the suction space (102) and the compression space (103) is formed, in which the head (210) includes an inner body (211) and an outer body (212) surrounding the inner body (211), and the suction port (214) is formed between the inner body (211) and the outer body (212).