JP2004263939A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a flammable or combustible fluid from leaking outside by a shock added by external force in a heat exchanger for flowing the flammable and combustible fluid. <P>SOLUTION: The fluid flowing on the outermost side of the heat exchanger is formed of that having relatively low risk of flammability or combustibility. The flammable or combustible fluid is made to flow inside that. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat exchanger that performs heat exchange between a flammable or combustible fluid such as hydrogen, methanol, or LPG and a fluid having a relatively low risk such as water, steam, or air.
[0002]
[Prior art]
As an example, various heat exchangers used in a fuel cell system pass a flammable or flammable gas or liquid.
As a heat exchanger for handling such a fluid, a stacked type in which a large number of plates are stacked or a type in which a large number of tubes are provided in a casing are used.
[0003]
[Problems to be solved by the invention]
A heat exchanger of a fuel cell system mounted on a vehicle is required to have high safety in consideration of impact resistance and the like.
Therefore, an object of the present invention is to provide a heat exchanger capable of preventing a dangerous fluid from leaking to the outside even if a crack occurs on the outer periphery of the heat exchanger due to an external force or the like.
[0004]
[Means for Solving the Problems]
According to the first aspect of the present invention, a large number of plates (1) are stacked so as to be parallel to each other with a gap therebetween, and the periphery of an adjacent plate (1) is formed in a liquid-tight manner. (1) In the heat exchanger in which the first fluid (4) and the second fluid (5) flow alternately in the stacking direction of (1),
At least the first fluid (4) circulating in the outermost plate (1) is a non-flammable, non-flammable, relatively low risk material;
The second fluid (5) flowing in the plate next to the outermost plate (1) is a heat exchanger configured to be relatively dangerous, such as flammable or flammable.
[0005]
The present invention described in claim 2 is based on claim 1,
Each plate (1) is formed in a planar rectangular shape, and plates are laminated via a pair of bar members (6) between two parallel edges of each plate (1). This is a heat exchanger alternately arranged on two parallel sides on one side of the plate (1) and the other two parallel sides perpendicular to the one side.
[0006]
According to the present invention, the tube (15) is inserted into the casing (14),
In the heat exchanger in which the first fluid (4) flows through the casing (14) and the second fluid (5) flows through the tube (15),
The first fluid (4) in the casing (14) is non-flammable, non-flammable and of relatively low risk;
The second fluid (5) in the tube (15) is a heat exchanger which is a fluid having a relatively high risk such as flammability or flammability.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic perspective view of a heat exchanger according to a first embodiment of the present invention, and relates to a so-called stacked heat exchanger.
That is, a large number of plates 1 are stacked via a pair of bar members 6, and the plate 1 is formed in a planar rectangular shape, and the bar members 6 are alternately arranged on both side edges and front and rear edges of the rectangular shape. Is done. The inner fins 11 and 12 are interposed between each pair of bar members 6. The plate 1, the bar material 6, and the inner fins 11, 12 are integrally joined to each other by means such as brazing to form a heat exchanger core.
[0008]
A pair of tanks 7 and 8 (one side of each is omitted) are disposed on the front, rear, left and right sides of the core. Then, the first fluid 4 and the second fluid 5 alternately flow on every other plate 1. At this time, the first fluid 4 flowing on the outermost side (upper and lower ends) is a fluid having a relatively low risk such as water, air, and steam.
That is, the relatively safe first fluid 4 flows through at least the uppermost stage and the lowermost stage of the core. A second fluid 5 composed of a flammable or flammable gas or liquid such as hydrogen, methanol, LPG, etc., flows through every other inside, and heat exchanges between the two fluids via each plate 1. Is performed.
[0009]
The pipes 9 and 10 communicate with the tanks 7 and 8, respectively. The first fluid 4 flows through the pipe 9 and the tank 7, and the second fluid 5 flows through the tank 8 and the pipe 10.
In the example of FIG. 1, the element is formed using the plate 1 and the bar 6, but instead of the bar, a drone cup formed by bending the periphery of the plate to form a shallow groove or a shallow dish. It may be a type heat exchanger. Even in such a case, the first fluid, which is relatively less dangerous, flows through the upper and lower ends in the laminating direction.
[0010]
Next, FIG. 2 is a schematic perspective view of a main part showing a second embodiment of the present invention, and relates to a shell and tube type heat exchanger.
That is, a large number of tubes 15 are arranged between the pair of tube plates 16 to form a core, and the cylindrical casing 14 is fitted between the outer circumferences of the pair of tube plates 16 in a liquid-tight manner. A pair of entrance / exit pipes 13 communicate with the casing 14. The opening edge of the tank 8 is connected to the outside of each tube plate 16 in the axial direction (the left side is omitted). Then, the first fluid 4 flows through the casing 14 via one of the entrance / exit pipes 13, flows around the outer circumference of each tube 15, and flows out of the other entrance / exit pipe 13.
[0011]
As the first fluid 4, a fluid having a relatively low risk such as water, air, or steam is used. Then, the second fluid 5 flows through each tube 15 through the tank 8.
As the second fluid 5, gas or fluid such as flammable or flammable fluid such as hydrogen, methanol, and LPG flows. Then, heat exchange is performed between the first fluid 4 and the second fluid 5.
In addition, in the example of FIG. 2, a large number of tubes 15 are provided in the casing. Instead, a double tube type is used, and a non-dangerous fluid flows through the outer tube side, and the dangerous fluid flows through the inner tube side. May be distributed.
[0012]
[Action and Effect of the Invention]
According to the present invention, in a heat exchanger in which a large number of plates are stacked or a heat exchanger in which tubes are inserted in a casing, the first fluid 4 flowing outside is relatively inflammable and non-flammable. Since the second fluid 5 flowing inside the second fluid 5 has a relatively high degree of danger such as flammability and flammability, an impact or the like may be applied to the outermost plate or casing. Even if a crack or the like is caused by the addition, it is possible to prevent the highly dangerous second fluid 5 from leaking to the outside. That is, it can be a highly safe heat exchanger.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a main part of a heat exchanger according to a first embodiment of the present invention.
FIG. 2 is a schematic perspective view showing a main part of the second embodiment.
[Explanation of symbols]
Reference Signs List 1 plate 4 first fluid 5 second fluid 6 bar material 7 tank 8 tank 9 pipe 10 pipe 11, 12 inner fin 13 inlet / outlet pipe 14 casing 15 tube 16 tube plate

Claims (3)

A large number of plates (1) are stacked so as to be parallel to each other with a gap therebetween, and the periphery of an adjacent plate (1) is formed in a liquid-tight manner, and alternately in the stacking direction of the plates (1). In the heat exchanger in which the first fluid (4) and the second fluid (5) flow,
At least the first fluid (4) circulating in the outermost plate (1) is a non-flammable, non-flammable, relatively low risk material;
A heat exchanger configured such that the second fluid (5) flowing in the plate next to the outermost plate (1) is of a relatively high risk such as flammability or flammability. In claim 1,
Each plate (1) is formed in a planar rectangular shape, and plates are laminated via a pair of bar members (6) between two parallel edges of each plate (1). A heat exchanger alternately arranged on two parallel sides on one side of the plate (1) and the other two parallel sides perpendicular thereto. A tube (15) is inserted into the casing (14),
In the heat exchanger in which the first fluid (4) flows through the casing (14) and the second fluid (5) flows through the tube (15),
The first fluid (4) in the casing (14) is non-flammable, non-flammable and of relatively low risk;
The heat exchanger, wherein the second fluid (5) in the tube (15) is a fluid having a relatively high risk such as flammability or flammability.

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