Check Valve Hardness Mismatch for Compressed Air Durability
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Solution Overview
Problem
Check valves in compressed air drying systems, especially those connected to forced-induction devices, face high pressure and temperature conditions, leading to high maintenance demands due to the need for improved sealing performance and durability.
Innovation Solution
A check valve design with a body and piston configuration, where the materials of the slidable-contact portions have different hardnesses, and multiple sealing members are used between the piston and body, along with a pressure regulating device to control the drain valve, ensuring effective sealing and reduced wear, thereby enhancing durability and maintenance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is connected to the compressor to prevent compressed air discharge, then forced-induction pressure is maintained, but the check valve experiences high pressure and high temperature conditions requiring frequent maintenance
Solution Approach 1:
The patent applies local quality by making the slidable-contact portion of the piston body from a material with different hardness than the piston material. Specifically, the piston body contact surface uses a harder material to resist wear from the piston, while other parts of the valve body can use different materials optimized for their specific functions. This localized material differentiation allows the sealing surface to withstand high pressure and temperature while maintaining durability.
Solution Approach 2:
The patent employs composite materials by combining materials with different hardness properties in the piston and piston body assembly. The piston is made from one material while the slidable-contact portion of the piston body is made from a material with different hardness, creating a composite structure that optimizes both sealing performance and wear resistance under severe operating conditions.
2Ease of repair
If the inlet port of the air drier is open during unloading mode, then the air drier can be regenerated, but compressed air is discharged into the atmosphere causing loss of forced-induction pressure
Solution Approach 1:
The patent applies dynamics by using a controllable valve mechanism that dynamically switches between open and closed states based on operational mode. During loading mode, the check valve closes to prevent compressed air discharge. During unloading mode, it opens to allow regeneration. This dynamic control resolves the contradiction between maintaining pressure and enabling regeneration.
Solution Approach 2:
The check valve acts as an intermediary device between the compressor inlet and the atmosphere. It mediates the flow of compressed air, allowing it to be retained during operation while permitting controlled discharge during regeneration. This intermediary function enables the system to alternate between pressure maintenance and desiccant regeneration modes.
3Reliability
If highly frequent maintenance work is performed on the check valve to maintain sealing performance, then reliability is improved, but productivity decreases due to maintenance time loss
Solution Approach 1:
The patent applies parameter changes by modifying the material hardness parameter of the slidable-contact portion. By using a harder material for the piston body contact surface, the wear rate is reduced, extending the maintenance interval. This parameter change transforms the maintenance frequency from highly frequent to less frequent, improving productivity while maintaining sealing reliability.
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
The design improves the durability and sealing performance of check valves, reducing maintenance needs and preventing compressed air from being discharged into the atmosphere, thus maintaining forced-induction pressure and extending the lifespan of the check valve.
Implementation Method 1
A hardness of at least a material of a slidable-contact portion of the body that slidably contacts the piston is different from a hardness of a material of the piston
Data Source
AI summary
A compressed air drying system includes a forced-induction device, a compressor to which the forced-induction device is connected, a removal device that performs a loading mode operation and an unloading mode operation, a pressure regulating device that opens and closes a drain valve device using air pressure, and a check valve, which includes a body and a piston. The body has a first port connected to the compressor, a second port connected to the removal device, and a third port connected to the pressure regulating device. The piston is slidably arranged in the body. The hardness of the material of a slidable-contact portion of the body that slidably contacts the piston is different from the hardness of the material for the piston.