Plate heat exchanger

Patent metadata

Field	Value
Publication number	US-9772146-B2
Application number	US-201214357007-A
Country	US
Kind code	B2
Filing date	Nov 7, 2012
Priority date	Nov 11, 2011
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A flow-path forming gasket is interposed between peripheries of each adjacent ones of stacked heat transfer plates; communicating-path forming gaskets are each installed, surrounding the passage holes in each adjacent ones of the heat transfer plates alternately; and thereby a first flow path adapted to pass a high-temperature fluid, a second flow path adapted to pass a low-temperature fluid, and communicating paths adapted to cause the fluids, respectively, to flow in and out of the first and second flow paths are formed alternately on opposite sides of each heat transfer plate. A drain hole is formed in each of the heat transfer plates to discharge fluid leaking from the first flow path, the second flow path, or the communicating path. The drain hole is surrounded by gaskets isolated from the first flow path, the second flow path, or the communicating path. A leakage flow path or a leakage collector is formed by the gaskets.

First claim

What is claimed is:

1. A plate heat exchanger wherein:
a plurality of heat transfer plates are stacked, each being provided with a plurality of passage holes;
a flow-path forming gasket is interposed between peripheries of each adjacent ones of the plurality of heat transfer plates, thereby alternately forming a first flow path adapted to pass a high-temperature fluid and a second flow path adapted to pass a low-temperature fluid on opposite sides of each heat transfer plate;
communicating-path forming gaskets surrounding the passage holes are each interposed between each adjacent ones of the plurality of heat transfer plates, thereby forming a communicating path adapted to cause a fluid to flow in and out of the first flow path and a communicating path adapted to cause a fluid to flow in and out the second flow path;
a drain hole is formed in each of the heat transfer plates to discharge fluid leaking from the first flow path, the second flow path, or the communicating path; and
the drain hole is isolated from the first flow path, the second flow path, or the communicating path by a plurality of gaskets, forming a leakage flow path or a leakage collector, and
an entire circumference of a first flow-path forming gasket which forms the first flow path is surrounded by a peripheral gasket; and the leakage flow path is formed between the first flow-path forming gasket and the peripheral gasket.

2. The plate heat exchanger according to claim 1 , wherein each of the communicating-path forming gaskets is a double-line gasket made up of an inner gasket member and an outer gasket member; the drain hole is formed between the inner gasket member and the outer gasket member; the leakage flow path is provided between the inner gasket member and the outer gasket member; and the drain holes exposed to the first flow path or the second flow path by being located next to the leakage flow path are communicated together by an annular gasket.

3. The plate heat exchanger according to claim 1 , wherein the passage holes are formed in respective corners of the heat transfer plate.

4. A plate heat exchanger wherein:
a plurality of heat transfer plates are stacked, each being provided with a plurality of passage holes;
a flow-path forming gasket is interposed between peripheries of each adjacent ones of the plurality of heat transfer plates, thereby alternately forming a first flow path adapted to pass a high-temperature fluid and a second flow path adapted to pass a low-temperature fluid on opposite sides of each heat transfer plate;
communicating-path forming gaskets surrounding the passage holes are each interposed between each adjacent ones of the plurality of heat transfer plates, thereby forming a communicating path adapted to cause a fluid to flow in and out of the first flow path and a communicating path adapted to cause a fluid to flow in and out the second flow path;
a drain hole is formed in each of the heat transfer plates to discharge fluid leaking from the first flow path, the second flow path, or the communicating path; and
the drain hole is isolated from the first flow path, the second flow path, or the communicating path by a plurality of gaskets, forming a leakage flow path or a leakage collector, and
a fluid supply hole is formed in the heat transfer plate to supply a third fluid into the leakage flow path or the leakage collector.

5. The plate heat exchanger according to claim 4 , wherein respective communicating-path forming gaskets are enclosed by a second flow-path forming gasket adapted to form the second flow path and a local gasket; and the leakage collector is formed among the respective communicating-path forming gaskets, the second flow-path forming gasket, and the local gasket.

6. A plate heat exchanger wherein:
a plurality of heat transfer plates are stacked, each being provided with a plurality of passage holes;
a flow-path forming gasket is interposed between peripheries of each adjacent ones of the plurality of heat transfer plates, thereby alternately forming a first flow path adapted to pass a high-temperature fluid and a second flow path adapted to pass a low-temperature fluid on opposite sides of each heat transfer plate;
communicating-path forming gaskets surrounding the passage holes are each interposed between each adjacent ones of the plurality of heat transfer plates, thereby forming a communicating path adapted to cause a fluid to flow in and out of the first flow path and a communicating path adapted to cause a fluid to flow in and out the second flow path;
a drain hole is formed in each of the heat transfer plates to discharge fluid leaking from the first flow path, the second flow path, or the communicating path; and
the drain hole is isolated from the first flow path, the second flow path, or the communicating path by a plurality of gaskets, forming a leakage flow path or a leakage collector, and
a drain channel continuous with the drain hole is formed in one of a fixed frame and a movable frame which sandwich the plurality of stacked heat transfer plates; a drain nozzle is mounted on the drain channel; and a sensor adapted to detect a fluid is connected to the drain nozzle.

Assignees

• Hisaka Works Ltd
• Hitachi Ge Nuclear Energy Ltd

Inventors

• Hiwatashi Isamu
• Iwaki Mana
• Kusunoki Kenji
• Ishihama Kiyoshi
• Matsumura Seiichi
• Kushima Yukiko

Classifications

• F28D9/005

  the plates having openings therein for both heat-exchange media · CPC title

• F28F2265/16

  for preventing leakage · CPC title

• F28F3/005 Primary

  Arrangements for preventing direct contact between different heat-exchange media (F28F3/10 takes precedence) · CPC title

• F28F3/08 Primary

  Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning · CPC title