Rotating Lever Vent Valve for Urea Tank Liquid Seal
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Solution Overview
Problem
Existing vent valves for liquid tanks, particularly those used in motor vehicles for urea solutions, face challenges in effectively venting while preventing liquid from escaping, especially during rapid filling when ammonia can form, leading to unpleasant odors and potential harm.
Innovation Solution
A vent valve with a rotatably mounted closing lever that includes a floating body and closure body, which can be pressed against the vent opening to create a fluid-tight seal when liquid flows in, and automatically releases when the liquid level drops, ensuring effective venting and preventing liquid escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vent valve is kept open for effective venting, then air can be discharged from the liquid tank, but liquid may escape from the vent valve during rapid filling
Solution Approach 1:
The vent valve employs a dynamic closing lever that can rotate between open and closed positions based on liquid level. The floating body moves with liquid level changes, automatically actuating the closing lever to rotate and close the vent opening when liquid approaches, and open it when liquid level drops, thus adapting the valve state to operational conditions
Solution Approach 2:
The vent valve is designed as a self-regulating system where the floating body automatically detects liquid level and triggers the closing mechanism without external control. The lever arm mechanism converts the floating body's vertical movement into rotational motion of the closing lever, creating a self-actuating system that responds autonomously to liquid level changes
2Reliability
If a closing mechanism is added to prevent liquid escape, then liquid containment is improved, but the device complexity increases
Solution Approach 1:
The closing lever acts as an intermediary mechanical element that translates the floating body's linear movement into rotational motion required for sealing. This lever arm mechanism serves as a simple mechanical mediator that connects the floating body to the closing body, enabling automatic actuation without complex control systems
Solution Approach 2:
The invention replaces complex electronic or pneumatic control systems with a pure mechanical solution. The floating body, lever arm, and closing mechanism work together as a mechanical system that automatically responds to liquid level changes, eliminating the need for sensors, actuators, or control electronics
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 ensures effective venting of the liquid tank while preventing liquid and ammonia from escaping, maintaining a fluid-tight closure during filling and releasing for proper ventilation when the liquid level falls, thus addressing the issue of ammonia odor and safety concerns.
Implementation Method 1
a floating body (127) which can be acted upon by a liquid flowing into the interior (103) of the housing (101)
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present invention relates to a vent valve (100) for venting a liquid tank, comprising a valve housing (101) which defines an interior housing space (103) and has a vent opening (115) for venting the interior housing space (103); and a rotatably mounted closing lever (123) for closing the vent opening (115), wherein the closing lever (123) has a float (127) and a closure body (125) for fluid-tight closing of the vent opening (115), wherein the closure body (125) can be pressed against the vent opening (115) by rotating the closing lever (123) in order to fluid-tightly close the vent opening (115), and wherein the float (127) can be acted upon by a liquid flowing into the interior housing space (103) for rotating the closing lever (123).