Header Collection Pipe Drainage Slot for Heat Exchanger Covers
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Solution Overview
Problem
Existing heat exchangers face challenges in ensuring effective water drainage from the upper section of the header collection pipe, leading to potential corrosion and ice growth due to condensation or rainwater accumulation, which compromises the joining strength between the cover member and the header collection pipe body.
Innovation Solution
A heat exchanger design featuring a vertically oriented header collection pipe with a cover member and a drainage slot formed by a downward receding pipe end section, allowing for efficient water drainage and secure fastening between the cover member and the header collection pipe body, while preventing corrosion and ice formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cover member is fixed to the header collection pipe body at the upper end, then the joining strength is improved, but water drainage is hindered due to limited joined sections
Solution Approach 1:
The pipe end section is segmented into two functional zones: an upper joined section for securing the cover member and a lower drainage section with a downward receding slope for water drainage. This segmentation allows the upper section to provide strong joining while the lower section ensures effective water drainage, resolving the contradiction between joining strength and drainage capability.
2Strength
If an opening is formed to insert the cover member from inside, then the joined section size is increased, but water accumulation space is created causing corrosion and ice growth
Solution Approach 1:
The harmful water accumulation space is extracted by forming a drainage passage through the downward receding pipe end section. This allows water to be actively removed from the potential accumulation zone, eliminating the harmful effect of water pooling while maintaining the beneficial large joined section area for cover member attachment.
3Strength
If the pipe end section is extended upward past the cover member, then the joining area is increased, but water drainage becomes more difficult
Solution Approach 1:
Different sections of the pipe end are given different qualities: the upper section has a larger diameter for extended joining area, while the lower section has a downward receding slope for effective drainage. This local differentiation allows each section to optimize its specific function, resolving the contradiction between joining area and drainage efficiency.
Data Source
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AI summary
Provided are a heat exchanger and a refrigeration device, whereby it is possible to ensure good water drainage on cover members, while maintaining a good state of fastening between the cover members and a header collection pipe body. A heat exchanger (20) is provided with a header collection pip (22, 23) to which are connected flat multi-hole pipes (21b) having a plurality of heat transfer fins (21a) joined thereto. The header collection pipe (22,23) includes a header collection pipe body (50), and a baffle (60) as a partitioning plate. The header collection pipe body (50) is provided so that the longitudinal direction thereof is vertically oriented. The baffle (60) serving as a cover member is furnished inside from the upper end of the header collection pipe body (50), and closes off the upper side of the header collection pipe body (50). The header collection pipe body (50) has a pipe end section (53) that extends upward past the baffle (60) serving as a cover member. A drainage slot (52) is formed in a part of the pipe end section (53).