Pressure-Sensitive Breather Valves for Vibration Shafts
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Solution Overview
Problem
In vibrating compaction machines, the breather formed inside the vibration generating shaft allows water to invade the casing when the machine is submerged, leading to potential malfunction or damage due to increased rotational load and rusting of bearings, as the existing design fails to prevent water ingress during non-operating submerged conditions.
Innovation Solution
A breather with a center passage and outer opening portions on the vibration generating shaft, equipped with intake and exhaust valves that open based on pressure differences, preventing water invasion by maintaining a closed state unless a specific pressure difference is exceeded, and featuring a design where the outer portion is covered to prevent dust entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the breather is formed inside the vibration generating shaft with the outer opening portion at the outer portion, then dust invasion is prevented, but water easily invades the casing when the machine is submerged
Solution Approach 1:
The patent applies parameter changes by introducing pressure-sensitive valve mechanisms that change their state based on pressure differential. The intake and exhaust valves open or close according to the pressure difference between inside and outside of the casing, transforming the breather from a passive opening to an actively controlled passage that adapts its permeability parameter based on operating conditions
Solution Approach 2:
The patent uses the pressure differential as an intermediary mechanism to control valve operation. The pressure difference between the internal and external environments acts as a mediator that automatically triggers the appropriate valve to open, enabling the system to respond to submersion conditions without direct mechanical intervention
2Object-affected harmful factors
If the casing is tightly closed to prevent dust entry, then dust invasion is reduced, but pressure difference may damage or detach the oil seal
Solution Approach 1:
The patent applies dynamics by implementing a dynamic breather system with movable intake and exhaust valves that automatically adjust their opening state based on pressure conditions. This transforms the static sealed casing into a dynamically balanced system that maintains sealing integrity while allowing pressure equalization when needed
Solution Approach 2:
The patent employs feedback mechanisms where the pressure differential inside and outside the casing provides continuous feedback to the valve system. This feedback automatically triggers the appropriate valve to open, creating a self-regulating system that prevents both dust invasion and oil seal damage
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 breather effectively inhibits water ingress and dust entry, ensuring the vibration generating device's operational integrity by allowing air exchange based on pressure differences and maintaining the valves in a closed state during submersion, thus preventing damage and malfunction.
Implementation Method 1
an intake valve configured of a valve body, a valve seat disposed further outward in a radial direction than the valve body, and a spring biasing the valve body from a side of the center passage toward a side of the intake opening portion and configured to open in a case in which a pressure in the casing becomes a negative pressure
Implementation Method 2
a spring biasing the valve body from a side of the center passage toward a side of the intake opening portion
Data Source
AI summary
A breather for a vibration generating device includes a center passage extending from an inner portion to an outer portion of a vibration generating shaft, an inner opening portion in an outer circumferential surface of the inner portion, an intake opening portion in a surface of the outer portion, an exhaust opening portion, an inner passage causing the center passage and the inner opening portion to communicate with each other, an intake passage causing the center passage and the intake opening portion to communicate with each other, and an exhaust passage causing the center passage and the exhaust opening portion to communicate with each other, an intake valve that opens in a case in which a pressure in the casing becomes negative disposed inside the intake passage, and an exhaust valve that opens in a case in which a pressure in the casing becomes positive disposed inside the exhaust passage.