Piston Suction Valve Layout for Larger Compressor Passage Opening
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Solution Overview
Problem
Existing compressors face challenges in securing both an enlarged opening of the communication passage and increased lift amount of the suction valve while reducing the piston diameter, as enlarging the opening leads to a larger closing portion area, making it difficult to secure a spring portion for the lift amount.
Innovation Solution
The compressor design includes a piston with a communication passage and a suction valve having a fixation portion, a closing portion on one radial side, and a spring portion on the opposite radial side, with a recessed spring portion facing portion on the piston surface, allowing for a larger opening and increased lift amount by reducing the spring constant through bent portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the opening of the communication passage is enlarged, then the air volume and pressure are improved, but the area of the closing portion increases making it difficult to secure a spring portion for increasing the lift amount
Solution Approach 1:
The suction valve is divided into distinct functional portions: a closing portion for sealing the communication passage opening, and a spring portion for providing the lifting force. This segmentation allows the closing portion to be optimized for sealing area while the spring portion is separately optimized for lift amount, resolving the contradiction between enlarged opening and sufficient spring area.
Solution Approach 2:
Different regions of the suction valve are given different functional qualities - the closing portion is designed for maximum sealing area to match the enlarged opening, while the spring portion is designed with sufficient area and elasticity for the required lift amount. This local differentiation allows each portion to be optimized independently for its specific function.
2Volume of moving object
If the piston diameter is reduced, then the compressor size is reduced, but it becomes difficult to secure both enlarged opening and increased lift amount
Solution Approach 1:
The suction valve is designed to utilize the radial dimension of the piston surface effectively. By arranging the closing portion and spring portion in different radial directions from the fixation portion, the design maximizes the use of available surface area on the reduced-diameter piston, allowing both functions to coexist in a compact configuration.
3Ease of operation
If the spring portion area is increased, then the lift amount is improved, but the area available for the closing portion is reduced
Solution Approach 1:
The suction valve employs an asymmetric radial layout where the closing portion and spring portion are positioned on opposite radial sides relative to the fixation portion. This asymmetric arrangement optimizes the distribution of areas, allowing the closing portion to be sufficiently large for sealing while the spring portion has adequate area for lift, without requiring equal division of the available surface.
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 achieves both an enlarged opening of the communication passage and increased lift amount of the suction valve, reducing the load under high pressure and securing air volume and pressure, while improving compressor efficiency.
Implementation Method 1
the spring portion (23C) is elastically deformed, the closing portion (23B) is separated from the opening (19A1)
Data Source
AI summary
A piston (18) of a compressor (1) partitions the inside of a cylinder (17) into a compression chamber (21) and a suction chamber (22). A communication passage (19A) is formed in the piston (18). The communication passage (19A) establishes communication between the compression chamber (21) and the suction chamber (22). The suction valve (23) opens and closes an opening (19A1) of the communication passage (19A). The suction valve (23) has a plate-like shape. The suction valve (23) includes a fixation portion (23A) fixed to the piston (18), a closing portion (23B) configured to cover the opening (19A), and a spring portion (23C) connecting the fixation portion (23A) and the closing portion (23B). A spring portion facing portion (19B) in the piston (18), which faces the spring portion (23C) of the suction valve (23), is recessed more deeply than a closing portion facing portion (19C), which faces the closing portion (23B) of the suction valve (23).