plate heat exchanger

Abstract

A plurality of heat transfer plates formed with a plurality of passage holes are stacked, and by inserting spacers for forming flow paths between the outer peripheries of adjacent heat transfer plates, the heat transfer plates are alternately formed with high temperature channels as boundaries. The first flow path through which the fluid flows, the second fluid through which the low-temperature fluid flows, and the communication path through which the fluid flows into and out of the first flow path and the second flow path are formed by inserting a gasket for forming a communication path surrounding the passage hole in the adjacent Between the heat transfer plates, there are formed a communication path for fluid to flow in and out of the first flow path and a communication path for fluid to flow in and out of the second flow path. The communication path forming gasket has an inner gasket member surrounding the passage hole and an outer gasket member surrounding the inner gasket member, and is formed in two layers.

Description

[0001] Cross-reference of related applications [0002] This application claims the priority of Japanese Patent Application No. 2011-233098, and the content is incorporated into the description of the specification of this application by reference. Technical field [0003] The present invention relates to a plate heat exchanger that exchanges heat between a high-temperature fluid and a low-temperature fluid. In particular, the present invention relates to stacking a plurality of heat transfer plates and inserting gaskets between the outer circumferences of the heat transfer plates. The heat transfer plates alternately form a plate heat exchanger in which a high-temperature fluid flows through a flow path and a low-temperature fluid flows through a flow path. Background technique [0004] Such as Figure 8 As shown, the plate heat exchanger stacks a plurality of rectangular heat transfer plates 20, 20 in a vertical posture between a rectangular plate-shaped fixed frame 11 in a vertica...

AI Technical Summary

Problems solved by technology

However, since the communication channel forming gasket 132 forming the communication channel 3 through which the high-temperature fluid H flows is not double-layered, oxidative deterioration occurs, and the high-temperature fluid H may leak to the outside.

[0023] Moreover, when the high-temperature fluid H is a dangerous chemical solution, if the high-temperature fluid H leaked from the plate heat exchanger flows out to the outside, secondary disasters may occur.

If gaskets are replaced early to prevent secondary disasters, operating costs will increase

In addition, it is also considered to cover the entire plate heat exchanger with a highly airtight sheet or insert rubber into the gap between the outer peripheral edges of the stacked heat transfer plates to suppress oxidation and deterioration and prevent the high-temperature fluid H from flowing out to the outside. approach, but such approaches have not been adopted due to cost or quality concerns

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