Plate heat exchanger with a double-wall structure

US4976313A · kind A · utility

Assignee

• Alfa Laval Thermal AB · SE

Inventors

• Arthur Dahlgren · Linköping, SE
• Magnus Kallrot · Lund, SE
• Mats Stromblad · Båstad, SE

Key dates

• Filing date: Mar 22, 1989
• Grant date: Dec 11, 1990
• Expiry date: Mar 22, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S165/362
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

In a series of heat exchange plates (5, 6), each being rectangular with ports (7, 8, 9, 10) in its corner portions, alternate plates (6) are fully sealed and coact with intermediate plates (5) to define two groups of elongated passages through which the respective heat exchanging fluids (A, B) flow. Each intermediate plate (5) is only partially sealed and defines with one of the two adjacent fully-sealed plates (6) an area communicating directly with the atmosphere, the partial sealing consisting of port sealing means (7a, 8a, 9a, 10a) interconnecting respective pairs of opposing ports to form channels through which the two fluids (A, B) flow without entering said area. The areas form paths through which any leakage of either fluid (A, B) can escape to the atmosphere, thus preventing contamination of either fluid by the other.