Air Supply Exhaust Adapter Negative Pressure Leakage Prevention
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Solution Overview
Problem
The challenge is to enable the safe installation and operation of a forced flue or forced draft balanced flue type combustion device without an air supply pipe, where existing exhaust pipes cannot be removed, and there's a risk of exhaust gas leakage into buildings.
Innovation Solution
An air supply and exhaust adapter with a box-shaped base, air supply intake, and circumferential wall portion that creates a communication passage to utilize existing exhaust pipes, employing a blower to generate negative gauge pressure and prevent gas leakage, and optionally includes a filter for foreign matter removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an FF type combustion device is installed by passing a new exhaust conduit through an existing exhaust pipe, then the device can be installed without removing the existing exhaust pipe, but there is a danger that exhaust gases may leak from the exhaust conduit to the interior of the building
Solution Approach 1:
The adapter acts as an intermediary component between the exhaust conduit and the building interior. It includes a communication passage that connects the space between the exhaust conduit and existing exhaust pipe to the air supply intake portion, serving as a mediator to redirect leaked exhaust gases away from the building interior.
Solution Approach 2:
The invention converts the harmful effect of exhaust gas leakage into a beneficial effect by utilizing the negative gauge pressure generated during blower fan operation to draw leaked exhaust gases back through the communication passage into the air supply intake, transforming a safety hazard into a self-correcting feature.
2Device complexity
If it is not possible to provide a new air supply pipe, then installation complexity is reduced, but it becomes impossible to replace with an FF type combustion device that requires outdoor air supply
Solution Approach 1:
The adapter enables the air supply function to be achieved through multiple pathways. It allows the air supply intake portion to receive air both from the building interior and from the space between the exhaust conduit and existing exhaust pipe, making the system adaptable to different installation scenarios without requiring a dedicated new air supply pipe.
Solution Approach 2:
The system utilizes the existing exhaust pipe structure and the negative pressure environment created during normal operation to provide the air supply function. The communication passage automatically draws air through the space between the exhaust conduit and existing exhaust pipe during operation, eliminating the need for separate air supply infrastructure.
3Reliability
If the space between the exhaust pipe and exhaust conduit is connected to a connection port on the outer casing to prevent exhaust gas leakage, then safety is improved, but this construction cannot be applied to FF type combustion devices that do not have such connection ports
Solution Approach 1:
The adapter separates the exhaust gas containment function from the device-specific connection port. By creating a standalone communication passage structure that connects the space between exhaust components to the air supply intake, it provides exhaust gas containment capability that is independent of whether the combustion device has a built-in connection port.
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
Enables safe operation of FF type combustion devices by using existing exhaust pipes, preventing gas leakage into buildings and allowing for effective air supply and exhaust management, even without an external air supply pipe.
Implementation Method 1
the communication passage being constructed so that, due to an operation of the air blower means, a gauge pressure therein becomes negative
Implementation Method 2
by utilizing the negative gauge pressure within the outer casing that is generated during operation of the blower fan, it becomes possible to send combustion exhaust gases that have leaked out into the space between the exhaust pipe and the exhaust conduit back into the combustion device for a second time
Data Source
AI summary
In an air supply and exhaust adapter for a combustion device of a forced air supply and exhaust type, with the combustion device comprising an air supply section and an exhaust section being provided to project from a top plate portion of an outer casing; comprising a base portion that comprises a box shaped configuration and an open bottom portion, an air supply intake portion that is formed on the top surface portion of the base portion so as to cover the air supply section and to take in air from the surroundings of the combustion device, a circumferential wall portion that surrounds the periphery of the exhaust section; and a communication passage defined between the top surface portion and the top plate portion so as to communicate the space between the exhaust section and the circumferential wall portion with the air supply intake portion; the communication passage being constructed so that, due to the operation of the air blower means, the gauge pressure therein becomes negative.