Relief Valve Flow Rectification for Fuel Pulsation Noise
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Solution Overview
Problem
Existing relief valves in fuel supplying systems for internal combustion engines generate noise due to pressure pulsation and vibration caused by swirl flows and vapor collisions, which are not effectively mitigated by current designs.
Innovation Solution
The relief valve design includes a loosely insertable wall portion and a projecting annular portion that form communication passages to rectify the main flow, reducing swirl formation and minimizing vapor collisions with the resilient member, thereby limiting pulsation and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the valve element is loosely inserted into the connecting portion to enable communication passage, then the valve can open and close properly, but a swirl flow of low flow speed is generated on the downstream side, causing pressure pulsation and chattering
Solution Approach 1:
A guide portion is introduced as an intermediary structure between the valve element and the connecting portion. This guide portion directs the fuel flow smoothly, preventing the generation of swirl flow while maintaining the loose fit necessary for valve operation. The guide portion acts as a mediator that transforms the flow pattern from chaotic swirl to orderly directed flow.
Solution Approach 2:
The flow speed parameter of the fuel is changed by introducing the guide portion. The guide portion increases the flow speed of the main flow directed from the communication passage, transforming it from a low-speed swirl flow to a high-speed directed flow that prevents chattering and pressure pulsation.
2Reliability
If the valve element operates in the valve opening state, then fuel pressure can be released, but negative pressure causes fuel vapor generation that collides with the resilient member, causing vibration and noise
Solution Approach 1:
The guide portion serves as an intermediary that prevents vapor collision with the resilient member. By directing the main flow at high speed, the guide portion creates a flow pattern that carries vapors away from the resilient member, preventing the collision that causes vibration and noise while maintaining pressure release functionality.
Solution Approach 2:
The invention addresses the vibration problem by changing the flow dynamics. The guide portion creates a high-speed main flow that suppresses the generation and propagation of vibrations caused by vapor collision, effectively using flow-induced stabilization to counteract the harmful mechanical vibrations.
3Productivity
If the communication passage is formed between the valve element and connecting portion, then fuel flow is enabled, but the swirl flow causes change in back pressure applied to the valve element
Solution Approach 1:
The guide portion changes the flow parameters by increasing the flow speed and directing the flow path. This transformation converts the low-speed swirl flow into a high-speed directed flow, maintaining high fuel flow rate while stabilizing the back pressure by eliminating the chaotic swirl pattern that caused pressure fluctuations.
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
This design effectively reduces noise generation by limiting fuel pulsation and vibration, ensuring quieter operation of internal combustion engines.
Implementation Method 1
a resilient member that is received in the inside of the connecting portion and urges the valve element toward the valve seat
Implementation Method 2
a main flow, which has a high flow speed and is bent from the first communication passage toward the radially inner side, is generated as a flow of the fuel
Implementation Method 3
a second communication passage, which is communicated with the first communication passage, is formed by the projecting annular portion to extend from a location between the projecting annular portion and the loosely insertable wall portion to a radially inner side of the projecting annular portion
Implementation Method 4
at the location between the valve element and the valve seat, at which the negative pressure is exerted in the valve opening state of the valve element, fuel vapor is generated due to the phenomenon of boiling in the vacuumed state
Data Source
AI summary
A valve element includes: a loosely insertable wall portion that is loosely inserted in an inside of a connecting portion on a downstream side of a valve seat; a fittable tubular portion that is fitted to the inside of the connecting portion on a downstream side of the loosely insertable wall portion; and a projecting annular portion-that projects from the fittable tubular portion toward a radially inner side of the fittable tubular portion. An outlet portion projects into the fittable tubular portion. A valve spring is located on a radially outer side of the outlet portion and on the radially inner side of the fittable tubular portion to urge the valve element toward the valve seat.