Pressure Indication Device with Safety Relief for Inflation Machines
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Solution Overview
Problem
Conventional mechanical pressure gauges, such as those using the Bourdon tube principle, are costly, fragile, and prone to inaccuracies due to external temperature and humidity effects, and require high precision machining, leading to manufacturing complexities and increased costs, while safety pressure relief mechanisms for inflation machines are also expensive and complex to implement.
Innovation Solution
A pressure indication device with a linearly movable plate and elastic element, where the elastic force drives the plate's movement along a scale bar for precise pressure measurement, and includes a pressure relief hole to release excess pressure safely, eliminating the need for expensive and fragile Bourdon tube-based gauges and complex relief valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Bourdon tube type mechanical pressure gauge is used, then pressure measurement function is achieved, but the device becomes costly and fragile due to precise components such as Bourdon tube, gear trains, and returning spring
Solution Approach 1:
The pressure gauge is divided into independent functional modules: the hollow tubular body as pressure chamber, the movable plate for indication, the elastic element for force balance, and the pressure relief hole for safety. Each module performs a specific function and can be manufactured separately with lower precision requirements, then assembled together.
Solution Approach 2:
The complex gear train mechanism and Bourdon tube are completely removed from the design. Instead, a simple movable plate directly indicates pressure level through its position, while the elastic element provides the necessary restoring force without requiring精密 gear engagement.
2Measurement precision
If Bourdon tube and returning spring are used for pressure measurement, then pressure indication is achieved, but measurement accuracy decreases due to sensitivity to external temperature and humidity changes
Solution Approach 1:
The design uses simple, robust components that are not sensitive to environmental conditions. The elastic element and movable plate configuration is inherently more stable against temperature and humidity variations compared to Bourdon tube and gear train mechanisms, providing consistent measurement accuracy in varying environments.
3Manufacturing precision
If high precision machining is used for gear train mating engagement, then transmission accuracy is improved, but manufacturing cost increases and manufacturing complexity increases
Solution Approach 1:
The entire gear train system is extracted and removed from the design. Pressure indication is achieved through the linear movement of the movable plate along a scaled path, eliminating the need for precise gear mating engagement and associated high-cost machining operations.
Solution Approach 2:
The design changes from rotational indication through gear trains to linear displacement indication. The movable plate moves linearly in response to pressure changes, and its position is read against a scaled path, simplifying the mechanical transmission requirements and reducing manufacturing precision demands.
4Reliability
If conventional pressure relief valve is used for safety pressure relief, then safety function is achieved, but the device becomes expensive and complex
Solution Approach 1:
The pressure relief function is merged with the hollow tubular body structure. The pressure relief hole is directly formed in the tubular body, integrating the safety relief function into the main pressure chamber structure rather than requiring a separate relief valve assembly.
Solution Approach 2:
The complex relief valve mechanism is completely removed. Instead, a simple pressure relief hole provides the safety function by allowing excess pressure to escape when it exceeds the design limit, eliminating the need for精密 valve components and complex adjustment mechanisms.
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 solution provides a durable, cost-effective pressure indication and safety relief mechanism that ensures precise pressure measurement and safe inflation, reducing manufacturing costs and improving durability and reliability.
Implementation Method 1
an elastic element and wherein an elastic force of compression of the elastic element is used to serve as a reaction force (restoration returning force) for linear movement of the plate
Implementation Method 2
a pressure induced in the air compartment drives the plate to make a linear movement of which the distance of movement is indicative of the level of pressure
Implementation Method 3
when the inflation pressure exceeds the maximum pressure setting, the excess of the inflation pressure is released through a pressure relief hole formed in a hollow tubular body of the pressure indication device
Data Source
AI summary
A pressure indication device is provided to connect to an inflation mechanism of an inflation machine. The pressure indication device includes a hollow tubular body in which a push bock is received in a manner of being movable by a pressure conducted into the hollow tubular body and connected to a linearly movable plate and biased by an elastic element. The hollow tubular body has a tubular wall forming a pressure relief hole at a preset position corresponding to a maximum allowable pressure level. A scale bar having graduations is provided along a moving path of the plate. The elastic force of compression of the elastic element serves as a reaction force (restoration and returning force) for the linear movement of the plate. A pressure conducted into the hollow tubular body from the inflation machine drives the plate to move and thus indicates the pressure level.