JPH1130397A - Solid-gas reaction filling vessel body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the concentration of a bending stress to the joined part between a flat heat transfer pipe and header by constituting the flat heat transfer pipe by a straight pipe adjoining mutually at a prescribed interval nearly perpendicular to the header and a bent pipe formed integrally with this. SOLUTION: A flat heat transfer pipe 23 is constituted by five straight pipes 23a and four bent pipes 23b formed integrally with this. A communication hole is formed on the periphery wall of headers 21, 22 so as to communicate with the flat heat transfer pipe 23. A fin 24, whose end is brazed to the outer surface of the flat heat transfer pipe 23, is extended in a vertical and front/rear direction. A through hole 24a for communicating hydrogen gas is provided on each fin 24. The space between a pair of fins 24 is partitioned by the peripheral wall parts 1a, 1b of a sealed up vessel 1 and the straight pipe 23a of the flat heat transfer pipe 23 and a cell 5 is constituted. Thus, as the joined place between the flat heat transfer pipe 23 and the headers 21, 22 is small, the headers 21, 22 can follow the expansion/shrinkage of hydrogen storage alloy powder 3 easily in a vertical and right/left directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-gas reaction packed container such as a heat exchanger and a hydrogen storage alloy heat exchanger for storing hydrogen storage alloy powder.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Hei 7-330301 discloses a heat exchanger which is accommodated in a closed container and exchanges a heat transfer fluid with the outside of the container, and has a property of changing volume by a solid-gas reaction. A solid-gas reaction powder filled in the heat exchanger and a reaction gas passage for flowing a reaction gas between the outside of the container and the solid-gas reaction powder are provided, and the heat exchanger is provided as shown in FIG. A pair of headers 100 extending in parallel with each other, a plurality of flat heat transfer tubes 200 arranged in parallel with each other, and both ends of which are individually and integrally joined to both headers 100;
There is proposed a hydrogen storage alloy heat exchanger including a fin 500 disposed in a gap 300 between the fins and dividing the gap 300 into a large number of cells 400. In addition, each flat heat transfer tube 200
Is mounted in a horizontal orientation.

[0003] In this hydrogen storage alloy heat exchanger, the hydrogen storage alloy powder can be dispersed and stored in a large number of cells, so that the hydrogen storage alloy powder is not locally localized, and the hydrogen storage alloy powder and the hydrogen storage alloy powder can be separated. And the heat transfer between the hydrogen storage alloy powder and the heat exchanger has little variation depending on the spatial position.

[0004]

However, in the finned flat heat transfer tube type hydrogen storage alloy heat exchanger disclosed in the above-mentioned publication, the hydrogen storage alloy powder individually filled in each cell stores and releases hydrogen gas. As shown in FIG. 4, the flat heat transfer tube 200, particularly the flat heat transfer tube 200 on the upper end side and the lower end side, repeatedly bends and deforms in the header extending direction, that is, upward or downward. A flat heat transfer tube 200 that attempts to bend under stress;
With respect to the external force in the vertical direction, a bending stress concentrates on the joint portion 600 between the header 100 and the header 100 which can be regarded as a rigid body, so that the sealing property of the brazed portion is reduced and the heat medium fluid leaks. was there.

Of course, the flat heat transfer tube 200 and the fin 50
The stress can be reduced by reducing the filling amount of the hydrogen storage alloy powder in each cell defined by 0, but the hydrogen storage and release capability of the hydrogen storage alloy heat exchanger is reduced. Resulting in. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a solid-gas reaction packing capable of avoiding a decrease in durability due to a volume change of a solid-gas reaction powder while securing excellent heat exchange property and solid-gas reaction capability. Providing a container is an issue to be solved.

[0006]

According to the first aspect of the present invention, a heat exchanger having a so-called serpentine structure is built in a closed vessel, and each of the cells is divided by the fins and the flat heat transfer tube. Solid-gas reaction powders are individually filled. In this case, the flat heat transfer tube is only joined to the header (ie, the inlet tube and the outlet tube) at two places at both ends thereof regardless of the total number of cells, and the number of joints is small. The possibility of occurrence of leakage can be remarkably reduced as compared with the above-mentioned conventional finned flat heat transfer tube type hydrogen storage alloy heat exchanger.

[0007] Even if the flat heat transfer tube is deformed in a direction perpendicular to the main surface thereof due to a change in the volume of the solid-gas reaction powder in the cell due to absorption and release of gas, the pair of headers is formed by the meandering flat heat transfer tube. Since it is only joined individually to both ends of the flat heat transfer tube, the flat heat transfer tube can be easily displaced by following the minute displacement, and almost no bending stress is applied to the flat heat transfer tube at the joint between the flat heat transfer tube and the header. Does not occur,
Therefore, the joint (generally the brazed portion) does not fatigue and the heat medium fluid or gas does not leak.

Further, since the solid-gas reaction powder is divided and accommodated in each cell and is in sufficient contact with each fin and the flat heat transfer tube, excellent heat exchange properties can be ensured, and the solid-gas reaction powder can be obtained. Settling and uneven distribution on the container bottom can also be prevented. Further, since it is not necessary to reduce the filling amount of the solid-gas reaction powder in order to prevent the leakage of the heat medium fluid and the gas in the above-mentioned joint, the solid-gas reaction performance does not decrease.

Further, by forming the reaction gas passage with a gas permeable pipe extending in the direction in which the header extends in the container, the exchange of gas with the solid-gas reaction powder becomes better. . In this case, the packing density of the solid-gas reaction powder in the closed container can be improved while ensuring the reactivity between the solid-gas reaction powder and the gas. That is, most of the solid-gas reaction powder in the closed container can be individually dispersed and stored in each cell of the heat exchanger without causing leakage of the heat medium fluid or the like of the heat exchanger. The expansion pressure is alleviated by the flat heat transfer tubes and the fins, so that the solid-gas reaction powder can be almost completely filled in the closed container without significantly improving the pressure resistance of the closed container.

According to the second aspect of the present invention, since the gas passage opening is provided in the fin, the reaction performance between the gas and the solid-gas reaction powder in each cell, especially in a cell at a position away from the gas permeable tube, is improved. Can be improved. According to the third aspect of the present invention, since the anti-settling plate is laid between the outer periphery of the heat exchanger and the inner periphery of the closed vessel, the settling of the solid-gas reaction powder and the consolidation at the bottom of the closed vessel are performed. Can be further improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the following examples.

[0012]

【Example】

(Embodiment 1) A hydrogen storage alloy heat exchanger accommodating metal hydride powder (hydrogen storage alloy powder) will be described with reference to FIGS. 1 and 2 as an example of the solid-gas reaction filled container body of the present invention.
FIG. 1 is a longitudinal sectional view of the heat exchanger, and FIG. 2 is a partial plan view of the heat exchanger.

1 is a closed container having a substantially rectangular parallelepiped outer shape, in which a heat exchanger 2 and a hydrogen storage alloy powder 3 are placed.
And four gas permeable tubes 4 are accommodated. The heat exchanger 2 has a pair of headers 21 and 22,
The flat heat transfer tube 23 is provided along the direction in which the headers 21 and 22 extend in a meandering manner by brazing to the header 22, and an extremely large number of fins 24 brazed to the outer surface of the flat heat transfer tube 23.

The headers 21 and 22 extend in the front-rear direction near the corners that are diagonal to each other inside the sealed container 1 and extend outwardly through an end wall (not shown) of the sealed container 1. ing. The header 21 is supplied with a heat medium fluid from the outside, and the header 22 circulates the heat medium fluid to the outside. The flat heat transfer tube 23 includes a total of five straight tube portions 23a and a straight tube portion 23.
a and a total of four curved pipe portions 23b formed integrally with each other, and the cross section perpendicular to the extending direction of the bent pipe portions 23b is an extremely elongated flat cross section. A communication hole that is long in the axial direction is formed in the peripheral wall of the headers 21 and 22, and the flat heat transfer tube 23 communicates with the communication hole. The straight pipe portion 23a extends in the horizontal direction. The curved tube portion 23b curved in a semi-cylindrical shape communicates the left end portions or the right end portions of two vertically adjacent straight tube portions 23a. As a result, the heat transfer fluid flows from the header 21 through the flat heat transfer tube 23 to the header 2.
It flows to two.

The fins 24 have their ends brazed to the outer surface of the flat heat transfer tube 23 and extend vertically and longitudinally. The headers 21 and 22, the flat heat transfer tubes 23, and the fins 24 are made of a metal having good thermal conductivity such as an aluminum alloy. Each of the fins 24 is provided with an appropriate number of through holes 24a for flowing hydrogen gas.

The gas permeable tube 4 is located outside the heat exchanger 2 and extends in the same direction as the headers 21 and 22, that is, in the front-rear direction in FIG. 1, and has one or both ends communicating with an external hydrogen gas source. I have. The gas permeation tube 4 is a cylindrical filter made of a porous sintered alloy, so that an external hydrogen gas source and the sealed container 1 can exchange hydrogen gas.

The upper and lower peripheral wall portions 1a and 1b of the sealed container 1
Are horizontally extended while being close to the uppermost and lowermost fins 24, so that the space between any pair of adjacent fins 24 is equal to the upper and lower peripheral wall portions 1 of the sealed container 1.
a, 1b and the straight tube portion 23a of the flat heat transfer tube 23 constitute a small chamber, that is, a cell 5. The space outside each cell 5 and the heat exchanger 2 thereof is almost completely filled with the hydrogen storage alloy powder 3.

According to the hydrogen storage alloy heat exchanger of the present embodiment configured as described above, the following effects can be obtained. First, both ends of the flat heat transfer tube 23 are
And the number of joints is small, so that even if both ends of the flat heat transfer tube 23 are displaced due to expansion and contraction of the hydrogen storage alloy powder 3, the headers 21 and 22 are vertically It is possible to easily follow the direction or the left-right direction, and it is possible to greatly reduce the possibility of the joints 7 being fatigue-ruptured.

The hydrogen-absorbing alloy powder 3 is housed separately in each cell 5 and is in sufficient contact with each fin 24 and the flat heat transfer tube 23, so that excellent heat exchange properties can be secured and hydrogen It is possible to prevent the storage alloy powder 3 from settling and unevenly distributed at the bottom of the container 1. Furthermore,
Since it is not necessary to reduce the filling amount of the hydrogen storage alloy powder 3 in order to prevent the heat medium fluid and the hydrogen gas from leaking at the joint 7, the hydrogen storage performance can be improved.

Further, since the gas permeable pipe 4 extending in the direction in which the headers 21 and 22 extend is provided, the gas permeable pipe 4 is provided even if the filling amount of the hydrogen storage alloy powder 3 is increased. A decrease in gas transfer performance can be suppressed. In addition, since most of the hydrogen storage alloy powder 3 is dividedly filled in each cell 5, the expansion pressure is relieved by the flat heat transfer tubes 23 and the fins 24, so that the hydrogen storage alloy powder 3 is almost completely sealed. Even if the container 1 is filled, the closed container 1
Can be remarkably reduced as compared with the case where the heat exchanger 2 is not used.

Further, an opening 24 for gas passage is formed in the fin 24.
Since a is provided, the reactivity between the hydrogen storage alloy powder 3 and the hydrogen gas in each cell 5, particularly in the cell 5 at a position away from the gas permeable tube 4, is improved. In addition, since the cells 5 communicate with each other in the front-rear direction, the hydrogen storage alloy powder 3 can be easily filled when the heat exchanger is manufactured. (Embodiment 2) Another embodiment will be described with reference to FIG.

The hydrogen storage alloy heat exchanger of this embodiment is obtained by adding a plurality of anti-settling plates 8 to the hydrogen storage alloy heat exchanger of the first embodiment shown in FIG. Anti-settling plate 8
Is an elongated member having an L-shaped cross section, one end of which is in contact with the inner surface of the peripheral wall of the sealed container 1 and the other end of which is in contact with the fins 24 and is horizontally extended. The hydrogen storage alloy powder 3 between the closed vessel 1 and the heat exchanger 2 can be more effectively prevented from settling.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a solid-gas reaction filled container body of the present invention.

FIG. 2 is a partially cutaway plan view of the solid-gas reaction filled container body of FIG.

FIG. 3 is a longitudinal sectional view showing another embodiment of the solid-gas reaction filled container body of FIG. 1;

FIG. 4 is a schematic diagram showing a basic configuration of a conventional hydrogen storage alloy heat exchanger using a conventional finned flat heat transfer tube type heat exchanger.

[Explanation of symbols]

1 is a sealed container, 2 is a heat exchanger, 3 is a hydrogen storage alloy powder (solid-gas reaction powder), 4 is a gas permeable tube, 5 is a cell, 21,
22 is a header, 23 is a flat heat transfer tube, and 24 is a fin.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiji Fuji 2-1-1 Toyota-cho, Kariya-shi, Aichi Prefecture Inside Toyota Industries Corporation (72) Inventor Hideto Kubo 2-1-1 Toyota-cho, Kariya-shi, Aichi Inside Toyota Industries Corporation (72) Inventor Nobuo Fujita 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. 1 Toyota Central Research Laboratory Co., Ltd. (72) Inventor Hiroyuki Mitsui 41 Toyota Central Research Laboratory Co., Ltd.

Claims (3)

[Claims] An airtight container for hermetically sealing the inside of the container, a heat exchanger housed in the container for exchanging a heat transfer fluid with the outside of the container, and having a property of changing volume by a solid-gas reaction. A gas-solid reaction powder filled in a closed container, and a reaction gas passage for flowing a reaction gas between the outside of the container and the solid-gas reaction powder, wherein the heat exchangers extend in parallel with each other; A pair of headers, a flat heat transfer tube having both ends integrally joined to the pair of headers, and fins disposed on an outer surface of the flat heat transfer tube. The heat pipes are arranged in parallel with each other and extend in a first direction substantially perpendicular to the direction in which the header extends. Adjacent to each other with a predetermined gap in the second direction. Solid-gas reaction filled container body characterized by having a large number of composed of a bent tube portion shape for communicating the parts together. 2. The solid-gas reaction filled container according to claim 1, wherein the fin has an opening for gas passage. 3. The solid-gas reaction powder container according to claim 1, wherein one end of the container is in contact with the fin, and the other end is in contact with the inner peripheral surface of the closed container. A solid-gas reaction filled container body comprising a settling prevention plate for preventing settling.