Offset Chimney Lining Device with Centering Guide
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Solution Overview
Problem
Existing methods for relining and repairing chimneys, especially those with offset portions, are inefficient due to difficulties in installing metal liners and applying flowable materials, leading to frequent deterioration and safety hazards.
Innovation Solution
A device featuring a spreader blade attached to a cable, which is pulled upward through the chimney to apply a flowable repair material, including a centering device to maintain alignment and a guide wheel to prevent snagging, allowing for even coating and filling of cracks and joints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal liner system is installed in an offset chimney, then the chimney can be relined, but the installation becomes difficult and complex due to the offset portion
Solution Approach 1:
The device is divided into separate functional components: a spreader assembly for applying material, a centering device with multiple rods for positioning, and a guide wheel for navigation. This segmentation allows each component to address specific challenges of offset chimney installation independently, making the overall system more manageable and adaptable to complex geometries.
Solution Approach 2:
The centering device includes rods that can flex and adjust their position dynamically as the device moves through offset portions of the chimney. This dynamic adaptation allows the rigid spreader assembly to maintain proper alignment and functionality even in non-linear chimney paths, resolving the contradiction between maintaining liner integrity and managing installation complexity.
2Manufacturing precision
If flowable liner material is applied using a round or oval bladder, then the material can be centered in the chimney, but the device cannot properly navigate offset portions
Solution Approach 1:
The centering function is separated from the material application function. The centering device with its multiple rods independently handles positioning and alignment, while the spreader assembly focuses on uniform material application. This segmentation allows the centering mechanism to adapt to offset portions without compromising the uniformity of material application.
Solution Approach 2:
The guide wheel acts as an intermediary element between the rigid spreader assembly and the flexible offset portions of the chimney. It facilitates navigation through bends and offsets while maintaining the structural integrity and alignment of the material application system, enabling the device to adapt to complex geometries.
3Ease of manufacture
If standard mortar is used to seal flue tile sections, then the joints can be sealed, but the joints deteriorate more rapidly due to water solubility and lack of heat resistance
Solution Approach 1:
The invention changes the material parameters by using refractory cement instead of standard mortar. This refractory cement has modified physical and chemical properties including water insolubility and high heat resistance, directly addressing the durability issues while maintaining the simplicity of joint sealing application.
Solution Approach 2:
The device applies a composite material system consisting of refractory cement that combines water resistance and heat resistance properties. This composite approach replaces the inadequate standard mortar with a multi-functional material that simultaneously provides sealing, water resistance, and thermal stability, resolving the contradiction between ease of application and long-term durability.
4Reliability
If clay flue tiles are removed to install a metal liner, then a properly-sized metal liner can be installed, but the work becomes more complex and time-consuming
Solution Approach 1:
Instead of removing existing tiles to install a metal liner, the invention inverts the approach by installing flowable liner material that conforms to the existing tile structure. This inversion eliminates the time-consuming tile removal process while achieving proper liner fit and seal through the flowable material's ability to adapt to the existing chimney geometry.
Solution Approach 2:
The invention changes the state of the liner material from rigid (metal pipe) to flowable (cast-in-place material). This parameter change allows the liner to be installed in its liquid or semi-liquid state and then set in place, eliminating the need to remove existing tiles and significantly reducing installation time while maintaining reliable fit and seal.
Data Source
AI summary
A device for repairing or relining an offset chimney includes a spreader assembly for spreading a repair material on the interior walls of a chimney as the device is pulled up the chimney, a pull assembly for pulling the device through the chimney, and an optionally reticulated centering device for keeping the portion of the pull assembly directly above the spreader assembly away from the chimney walls when the spreader blade assembly is moved through a chimney offset.