Discharge Pipe Ventilation Valve With Pneumatic Float Isolation
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Solution Overview
Problem
Existing pipe ventilating devices in water-conducting household appliances, such as dishwashers, face issues with dirt deposition on sealing surfaces due to direct contact with dirty liquids, leading to impaired sealing and potential vacuum-induced sucking of water from appliances.
Innovation Solution
A pipe ventilating device with a float valve actuated pneumatically by a pressure medium, where the valve body is separated from the flow medium, using a float chamber filled with a working medium to prevent direct contact with dirt, ensuring reliable sealing and effective ventilation without soiling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pipe ventilating valve is arranged directly in the discharge pipe to ensure effective ventilation, then ventilation effectiveness is improved, but dirt deposits on the sealing surface impair the sealing action
Solution Approach 1:
The patent introduces a float chamber filled with fresh water as an intermediary medium between the dirty discharge pipe and the ventilating valve. The valve body operates in this clean environment while still responding to pressure changes in the discharge pipe through pneumatic coupling, preventing direct contact with dirt particles that would otherwise deposit on sealing surfaces and impair sealing action.
Solution Approach 2:
The system is divided into two separate functional zones: the discharge pipe containing the dirty flow medium and the float chamber containing the clean working medium. This segmentation allows the ventilating valve to operate in a clean environment while remaining responsive to conditions in the dirty environment through pressure transmission, effectively separating the contamination source from the sensitive sealing components.
2Reliability
If the discharge pipe is raised to prevent vacuum sucking, then water loss from the appliance is prevented, but the valve body becomes susceptible to dirt contact when liquid flows upward
Solution Approach 1:
The float chamber with fresh water serves as a protective intermediary that shields the valve body from direct exposure to dirty ascending liquid. Pressure changes from the discharge pipe are transmitted pneumatically through the float chamber to actuate the valve, allowing the valve to respond to flow conditions without being contaminated by the dirty medium.
Solution Approach 2:
The system uses pneumatic pressure transmission through the float chamber to actuate the ventilating valve. Pressure changes in the discharge pipe are transmitted through the incompressible fresh water in the float chamber to move the float and valve body, enabling remote actuation without mechanical or direct fluid contact between the valve and dirty discharge pipe.
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 consistent sealing and effective ventilation of the discharge pipe by preventing direct contact between the valve body and dirty water, maintaining the valve's sealing integrity and preventing dirt accumulation, even under vacuum conditions.
Implementation Method 1
force is transmitted pneumatically between the flow medium of the discharge pipe and the working medium of the float chamber by means of a pressure medium separated from the flow medium for actuating the valve body
Implementation Method 2
The pipe ventilating valve has a valve body (7) designed as a float for closing and opening the pipe ventilating valve. The valve body (7) is actuated by a working medium (8) of the float chamber (9)
Data Source
AI summary
A ventilation device for the discharge pipe for removing a flow medium pumped to a household appliance. A pipe ventilation valve is connected to the discharge pipe by a channel and comprises a valve body disposed in a float chamber filled with a working medium which is separated from the flow medium and actuates the valve body. The valve body is actuated by transmitting a pneumatic force between the flowing medium and the working medium of the float chamber or between the flowing medium and a sealing surface adjacent to the valve body by means of a pressure medium which is separated from the flowing medium and is enclosed in the channel. The inventive pipe ventilation device makes it possible to avoid a direct contact between the valve body of the pipe ventilation valve and the flowing medium, thereby preventing the valve body from being soiled.