Heat Exchanger

The laminated heat exchanger design with strategically arranged flow path portions and increased flow resistance in the second flow path portion addresses refrigerant bias and dead water areas, improving heat exchange efficiency by ensuring even refrigerant distribution.

JP7647819B1Active Publication Date: 2025-03-18FUJITSU GENERAL LTD
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Patent Information

Application Number
JP2023143792
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2023-09-05
Publication Date
2025-03-18
Estimated Expiration
2043-09-05

AI Technical Summary

Technical Problem

In existing heat exchangers, the uniform arrangement of protrusions on metal plates leads to refrigerant bias within the flow path, potentially forming dead water areas where refrigerant does not fully reach.

Method used

A laminated heat exchanger design featuring metal plates with specific flow path configurations, including a first, second, and third flow path portion, where the second flow path portion has greater flow resistance due to a smaller cross-sectional area and denser protrusions, helping to rectify refrigerant flow and prevent bias.

Benefits of technology

The design effectively suppresses refrigerant bias within the flow path, reducing the formation of dead water areas and enhancing heat exchange capacity by ensuring even distribution of refrigerant throughout the flow path.

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Abstract

A heat exchanger in which bias in the flow of a refrigerant within a flow path is suppressed. [Solution] The heat exchanger is a heat exchanger in which a plurality of metal plates are stacked. At least one of the plurality of metal plates has an inlet, an outlet, a partition wall, and a plurality of protrusions protruding from the partition wall. A flow path portion is formed on the partition wall by the plurality of protrusions. The flow path portion has a first flow path portion, a second flow path portion, and a third flow path portion between the inlet and the outlet. The first flow path portion, the second flow path portion, and the third flow path portion are arranged in this order from the inlet to the outlet. The flow path resistance of the second flow path portion is greater than the flow path resistances of the first flow path portion and the third flow path portion.
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