Heat exchange-type ventilation device
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Solution Overview
Problem
The existing heat-exchange type ventilation apparatus faces challenges in maintaining airtightness between the frame members and the main body, especially when the heat exchange element contracts over time, leading to potential air leakage between the supply and discharge air paths.
Innovation Solution
The apparatus incorporates frame members with L-like sections and inner protrusions that abut the heat exchange element, along with a fitting structure using outer protrusions and support recess portions, which enhances airtightness by ensuring line contact and the use of seal material, even when the heat exchanger contracts or varies in dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame members are simply abutted against the main body, then the structure is simple and easy to manufacture, but airtightness deteriorates when the heat exchange element contracts over time
Solution Approach 1:
The frame member is divided into multiple segments: the main body portion, the protrusion extending from it, and the groove formed on the protrusion. This segmentation allows each part to perform its specific function - the protrusion provides positioning while the groove accommodates seal material, collectively ensuring airtightness without requiring complex integrated designs
Solution Approach 2:
A seal member (elastomeric material) is introduced as an intermediary between the frame member and the main body. This seal member fills the groove and abuts against the main body, creating an airtight seal that compensates for dimensional changes and contraction of the heat exchange element over time
2Stability of the object's composition
If the heat exchange element is allowed to contract freely, then material stress is reduced, but air leakage occurs between supply and discharge paths
Solution Approach 1:
The seal member is made of elastomeric material that can flex and deform. This flexible seal member accommodates the dimensional changes and contraction of the heat exchange element while maintaining continuous contact to prevent air leakage, effectively resolving the conflict between dimensional stability and preventing harmful air leakage
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 configuration significantly improves airtightness between the frame members and the main body, preventing air leakage and maintaining efficiency even when the heat exchanger contracts, while also reducing pressure loss and power consumption.
Implementation Method 1
a heat exchange element (21) that includes a plurality of heat exchange plates, which are sheet-like partition plates, stacked together with spacing therebetween
Data Source
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AI summary
A heat-exchange type ventilation apparatus includes: a main body in which a supply air path and a discharge air path are formed; an air supplying fan placed in the supply air path; an air discharging fan placed in the discharge air path; and a heat exchanger (2) to allow heat exchange between air passing through the supply air path and air passing through the discharge air path. The heat exchanger (2) includes: a heat exchange element (21) including a plurality of partition members each having a sheet-like and polygonal shape, the partition members being stacked with spacing therebetween; and a frame member (22) covering an edge of the heat exchange element (21), the edge extending in a stacking direction of the partition members. An outer protrusion (52) extending in the stacking direction is formed on a surface of the frame member (22), the surface being opposite a surface of the frame member facing the heat exchange element (21).