Gas-Pressure Relief Valve Structure for Stable Open-State Holding
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Solution Overview
Problem
Conventional relief valves with hemispherical valve seats and bodies struggle to maintain a stable open state due to the difficulty in using the hemispherical protrusion as a pressure receiving surface, making it challenging to automatically open and close the valve body using gas pressure without an electric drive source.
Innovation Solution
A relief valve design featuring a cylindrical valve body with distinct pressure receiving surfaces and a peripheral wall that extends along the inner surface of the valve casing, allowing the valve body to be automatically opened and closed by gas pressure, utilizing a biasing member and pressure regulating mechanism without requiring an electric drive source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a hemispherical valve seat and valve body are used, then the valve can be simple in structure, but the valve-opened state cannot be stably maintained due to insufficient pressure receiving surface area
Solution Approach 1:
The valve body is divided into distinct functional regions: a first pressure receiving surface portion with a large area for receiving gas pressure to open the valve, a second pressure receiving surface portion for maintaining the open state, and a peripheral wall portion. This segmentation allows each region to perform its specific function optimally, resolving the contradiction between structural simplicity and stable operation.
Solution Approach 2:
Different portions of the valve body are designed with different geometric properties tailored to their specific functions. The first pressure receiving surface portion has a large area for effective pressure reception, while the peripheral wall portion provides structural support and sealing. This local optimization enables the valve to maintain stable operation without excessive complexity.
2Extent of automation
If the valve body is raised by gas pressure to open the valve hole, then automatic opening/closing operation is achieved, but the valve-opened state becomes difficult to maintain without additional mechanisms
Solution Approach 1:
The valve body's own structure provides the mechanism for maintaining the open state. The first and second pressure receiving surface portions, combined with the peripheral wall portion, create a self-sustaining configuration where gas pressure naturally maintains the valve in the open position without requiring external actuators or complex control systems.
Solution Approach 2:
The valve body design extends into the radial dimension with the peripheral wall portion, creating a three-dimensional structure that interacts with the valve seat in multiple directions. This dimensional expansion allows the valve to maintain stability through distributed pressure reception and geometric interlocking, enabling reliable automatic operation.
3Productivity
If a substantial gap is provided between valve body and valve seat, then mixed gas can flow smoothly after opening, but gas leakage occurs in the valve-closed state
Solution Approach 1:
The valve body is designed to dynamically transition between two states: fully seated against the valve seat for tight closure, and fully raised for open flow. The first pressure receiving surface portion ensures complete sealing when closed, while the second pressure receiving surface portion and peripheral wall portion facilitate smooth gas flow when open, eliminating the need for a permanent gap.
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 valve body is smoothly opened and maintained in a stable open state by gas pressure, ensuring reliable operation in devices such as artificial respirators and exercise support devices, with the added benefit of being waterproof and cost-effective due to the absence of electronic components.
Implementation Method 1
a biasing member (6) that biases the valve body (4) toward the valve hole (2j)
Implementation Method 2
the valve body (4) is raised in the cylinder axial direction by pressure of gas flowing from the suction port (2b) to open the valve hole (2j)
Data Source
AI summary
A relief valve in which a valve body is automatically properly opened/closed by pressure of gas while having a simple device structure, and a device including the relief valve. In a valve-closed state, a first pressure receiving surface portion receives pressure of gas from a valve hole to smoothly open a valve body, and in an open position after the valve is opened, a pressure receiving area is enlarged to a second pressure receiving surface portion, and the first pressure receiving surface portion and the second pressure receiving surface portion are surrounded by a peripheral wall portion formed on a back surface of the valve body. Thus, the valve body continuously receives the pressure with the pressure of the gas being reduced, thereby allowing the valve-opened state of the valve body to be stably maintained to set pressure.