Pneumatic Hydraulic Retractor Pressure Relief for Lower Operating Force
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Solution Overview
Problem
Existing pneumatic hydraulic retractable devices experience significant airtight resistance between the piston valve and shock-absorbing elements, making operation inconvenient and compromising the shock-absorbing effect.
Innovation Solution
Incorporation of a pressure relief element with a communication portion between the valve seat and plug seat, allowing fluid flow between the upper and lower fluid chambers to reduce airtight resistance, facilitating easier operation and maintaining effective shock absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston valve and shock-absorbing element form an airtight seal, then the shock-absorbing effect is improved, but the operating force required increases significantly
Solution Approach 1:
The sealing surface is segmented into multiple sealing ribs (first sealing rib, second sealing rib, third sealing rib) distributed around the piston valve. This segmentation allows the air chamber to be divided into multiple sealed regions, maintaining effective shock absorption through distributed sealing contact while reducing the total sealing force required compared to a single large sealing surface.
Solution Approach 2:
Different sealing ribs are positioned at different locations and orientations around the piston valve to create localized sealing zones. The first sealing rib seals the upper air chamber, the second sealing rib seals the lower air chamber, and the third sealing rib provides additional sealing. This local quality approach ensures effective shock absorption in different regions while distributing the sealing force to reduce overall operating resistance.
2Reliability
If the piston valve forms an airtight seal with the shock-absorbing element, then air pressure containment is improved, but resistance to piston rod movement increases
Solution Approach 1:
The air pressure containment function is achieved through multiple sealing ribs rather than a single sealing interface. The first sealing rib contains pressure in the upper air chamber, the second sealing rib contains pressure in the lower air chamber, and the third sealing rib provides additional pressure containment. This segmentation maintains effective air pressure containment while distributing the sealing force to reduce resistance to piston rod movement.
Solution Approach 2:
The sealing ribs are pre-positioned on the piston valve body to establish sealing contact before the piston rod begins movement. This preliminary sealing action ensures that air pressure containment is already in place before motion occurs, preventing pressure leakage while the piston rod moves with reduced resistance compared to establishing seals during motion.
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 reduces airtight resistance, enabling easier operation of the piston rod while preserving the shock-absorbing effect, enhancing user convenience and device performance.
Implementation Method 1
the fluid is allowed by the communication portion to flow between the lower fluid chamber and the pressure relief gap for reducing airtight effect
Implementation Method 2
If the lifting tube is not pressured, the lifting tube is driven by the air flowing from the second air chamber to the first air chamber to rise
Implementation Method 3
the airtight effect will counteract the shock-absorbing effect produced by the air
Data Source
AI summary
A pneumatic hydraulic retractable device includes a fluid pressure cylinder having a cylinder body and a plug seat disposed in the cylinder body, a piston rod movably disposed in the fluid pressure cylinder, a control valve set having a valve seat disposed at the piston rod and forms an upper fluid chamber and a lower fluid chamber with the cylinder body therebetween, and a valve rod disposed in the valve seat for controlling communication between the upper and lower fluid chambers, and a pressure relief element forming a pressure relief gap with the piston rod. The pressure relief gap communicates with the lower fluid chamber through a communication portion of the pressure relief element. As such, when the valve rod is opened, the fluid is allowed to flow between the lower fluid chamber and the pressure relief gap through the communication portion for reducing airtight effect.