Self-Actuating Rotary Dust Valve for Engine Air Cleaner
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Solution Overview
Problem
Existing dust valves in internal combustion engines fail to reliably eject dust and debris due to insufficient pressure pulsations and elastomeric aging, leading to accumulation in air cleaners and potential back-flow issues, especially under tier 4 emission standards.
Innovation Solution
A self-actuating rotary dust valve with a rotor chamber and radially extending fin members that rotate to open dust pockets from the inlet to the outlet, utilizing gravity and engine vibrations for dust ejection, maintaining a continuous air lock closure to prevent back-flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flap valves are used to discharge dust from air cleaner, then dust ejection is achieved, but the valve fails to reliably open due to insufficient pressure pulsations and elastomeric aging
Solution Approach 1:
The rotary dust valve divides the dust discharge mechanism into multiple fin members (typically 3-6) that segment the rotor chamber into multiple dust pockets. Each fin member acts as an independent seal that collectively provides reliable dust ejection through rotational movement, eliminating the need for complex elastomeric components while maintaining functional reliability.
Solution Approach 2:
Instead of using elastomeric lips that open inward in response to pressure pulsations, the invention uses rigid fin members that rotate outward to open dust pockets. The rotation direction and opening mechanism are inverted from conventional flap valves, allowing the dust pocket to open to the outlet port through gravitational and vibrational forces acting on the accumulated dust mass.
2Reliability
If elastomeric dust valves are used, then dust discharge function is provided, but elastomers age and lose resilience causing valve failure
Solution Approach 1:
The rotary dust valve replaces expensive, aging-prone elastomeric components with inexpensive, non-degrading rigid fin members made from materials such as aluminum, stainless steel, or plastic. These fin members have no elastomeric components that can age or lose resilience, providing indefinite service life without performance degradation.
Solution Approach 2:
The rotor assembly combines multiple materials with complementary properties: rigid fin members for structural integrity and sealing, hub member for rotational support, and appropriate bearing surfaces. This composite construction eliminates elastomeric aging while maintaining the necessary sealing and operational characteristics.
3Reliability
If dust valve lips are held closed by vacuum, then sealing is achieved, but dust and debris cannot exit when vacuum is too strong
Solution Approach 1:
The rotary dust valve dynamically transitions between sealed and open states through rotation. The fin members maintain sealing when closed but rotate to open dust pockets when dust accumulation reaches a critical mass. This dynamic operation allows the valve to adapt to varying vacuum conditions and dust loads, maintaining both sealing reliability and ejection efficiency.
Solution Approach 2:
The valve changes its operational parameter from a static closed position to a rotated open position. The fin members rotate to change the orientation of dust pockets from a closed state (sealing against vacuum) to an open state (allowing dust ejection), enabling the system to overcome strong vacuum forces that would prevent conventional valve operation.
4Productivity
If flap valves open in response to pressure pulsations, then momentary dust discharge occurs, but pressure pulsations are insufficient under tier 4 emission standards
Solution Approach 1:
The rotary dust valve is self-actuating through gravitational and vibrational forces. As dust accumulates in the dust pockets, the increasing mass creates gravitational torque that, combined with engine vibrations, automatically rotates the fin members to open the dust pockets for ejection. This self-service mechanism eliminates the need for external actuators or complex pressure-responsive mechanisms.
Solution Approach 2:
The invention utilizes mechanical vibrations from engine operation to facilitate the rotation of fin members and ejection of dust. The vibrations provide the necessary impetus to overcome static friction and initiate rotation, working in conjunction with gravitational forces on accumulated dust to achieve periodic dust discharge without requiring external actuation mechanisms.
5Reliability
If rotary dust valve maintains continuous air lock closure, then back-flow is prevented, but dust ejection against vacuum requires overcoming pressure differential
Solution Approach 1:
The continuous air lock closure is achieved through multiple segmented fin members that collectively seal the rotor chamber. Each fin member creates a sealing surface that, when positioned correctly, prevents back-flow while allowing dust ejection through the outlet port. The segmentation allows the air lock to be maintained without requiring a single complex sealing mechanism.
Solution Approach 2:
The fin members act as intermediaries between the inlet and outlet ports, maintaining the air lock closure while facilitating controlled dust ejection. The fin members rotate to temporarily open dust pockets to the outlet port for dust discharge while maintaining sealing at other positions, mediating between the vacuum pressure and dust ejection requirements.
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 rotary dust valve effectively and reliably ejects dust while operating against the engine's intake tract vacuum, avoiding elastomeric aging issues and ensuring low cost and compact design, preventing back-flow and maintaining air cleaner functionality.
Implementation Method 1
The fin members freely rotate in unison about the axis such that dust buildup in the dust pocket in the first position is operable by gravity and/or vibration to rotate the duct pocket with buildup into the second position to discharge the dust buildup through the outlet port.
Implementation Method 2
The fin members freely rotate in unison about the axis such that dust buildup in the dust pocket in the first position is operable by gravity and/or vibration to rotate the duct pocket with buildup into the second position to discharge the dust buildup through the outlet port.
Implementation Method 3
The rotor chamber and the fin members are cooperatively shaped and configured to maintain a continuous air lock closure between the inlet and outlet port as the fin members rotate about the axis within the chamber, providing pressure and air flow separation between the inlet and outlet ports.
Data Source
AI summary
The present invention relates to a self actuating rotary dust valve particularly for discharging dust from an engine air cleaner. The rotary dust valve includes a valve body having an inlet port, an outlet port and a rotor chamber interposed therebetween. A rotary dust ejection member is enclosed in the rotor chamber and supported for rotation about a fixed axis. A plurality of fin members are provided angularly spaced about and secured to the hub member. Adjacent pairs of the fin members define at least one dust pocket therebetween to receive dust from the air cleaner to be ejected. The rotor chamber and the fin members are cooperatively shaped and configured to maintain a continuous air lock closure. The dust valve is operable by any of: gravity and vibration to rotate and thereby to discharge the dust buildup through the outlet port or alternately by other drive means.