JP2000193382A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger that prevents fluid from being mixed due to the damage to a heat transfer wall, at the same time can secure superior heat transfer efficiency, and also can be easily manufactured. SOLUTION: In a heat exchanger, a heat transfer pipe 1 with a rectangular outer-periphery section shape is alternately positioned in each of two directions where a heat transfer pipe 1a for first fluid for allowing first fluid A to pass, and a heat transfer pipe 1b for second fluid for allowing second fluid B to pass, orthogonally cross the direction of a pipe core. Furthermore, the heat exchanger is integrated in a state where the outer-periphery plane parts of the adjacent heat transfer pipes 1a and 1b oppose and are in contact each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly, to a heat exchanger which prevents mixing of a first fluid and a second fluid to be exchanged due to breakage of a heat transfer wall (partition wall). About.

[0002]

2. Description of the Related Art Conventionally, as this type of heat exchanger, FIG.
In a double pipe structure as shown in FIG. 1, a gap flow path e for leaking fluid (that is, a clearance flow path e (that is, between an outer pipe 21 through which the first fluid A passes) and an inner pipe 22 through which the second fluid B passes. Outer tube 21
(For example, Japanese Patent Application Laid-Open No. 9-90). In this case, a flow path for guiding the leaking first fluid A for the damage of the inner pipe 22 and for guiding the leaking second fluid B for the damage of the inner pipe 22 is known. 119
No. 791).

Further, as shown in FIG. 9, two plate members 23 are joined in a state in which a flow path f of a heat exchange fluid is formed between the plate members 23, and a flow path formation in the plate joined body S is performed. In a state where the expanded tube portions p of the portions are in contact with each other, a plurality of plate material joined bodies S are stacked in the plate thickness direction, whereby a gap between the adjacent plate material joined members S is formed in a flow path e for leakage fluid. (See, for example, Japanese Patent Application Laid-Open No. 10-253).
282).

[0004]

However, in the former double-pipe type, the gap flow path e for the leaked fluid between the inner pipe 22 and the outer pipe 21 becomes a heat insulating layer, and the heat transfer efficiency is reduced. In addition, the space between the inner tube 22 and the outer tube 21 is filled with a porous metal, or the inner tube 22 is partially deformed to be in contact with the outer tube 21 to improve heat transfer efficiency. However, in this case, there is a problem that the structure becomes complicated, the production becomes difficult, and the production cost increases.

[0005] On the other hand, in the case of the latter plate material joint type,
In order to manufacture the plate member 23 having the expanded tube portion p for forming the flow path, there is a problem that a large dedicated mold is required and the manufacturing cost is increased. Since it is limited to two surfaces, it is necessary to reduce the thickness of the sheet material assembly S as much as possible to increase the number of laminated sheets in order to secure a heat transfer area. The pipes of the first fluid A and the second fluid B connected to the passage f are also thin, making it difficult to connect the pipes and increasing the pressure loss.

In view of this situation, the main problems of the present invention are:
The object is to provide a heat exchanger that can obtain high heat transfer efficiency and can be easily manufactured while preventing the first fluid and the second fluid that are heat exchange targets from being mixed due to breakage of a heat transfer wall. .

[0007]

Means for Solving the Problems [1] In the invention according to the first aspect, the heat transfer tube having a rectangular outer peripheral cross-sectional shape passes through the heat transfer tube for the first fluid and the second fluid through which the first fluid passes. The heat transfer tubes for the second fluid to be made are alternately located in each of the two directions orthogonal to the tube core direction, and the heat transfer tubes are integrated in a state where the outer peripheral flat portions of the adjacent heat transfer tubes are in opposing contact. .

That is, according to this configuration, since the first fluid and the second fluid are passed through the respective adjacent heat transfer tubes to exchange heat, even if the heat transfer tube for the first fluid is broken, leakage occurs. It is possible to prevent the first fluid from mixing with the second fluid, and to prevent the leaking second fluid from mixing with the first fluid even if the heat transfer tube for the second fluid is broken. In addition, it is possible to prevent the first fluid and the second fluid from being mixed due to breakage of the heat transfer wall.

In this configuration, heat is exchanged between the first fluid and the second fluid by using the outer peripheral flat portion of each heat transfer tube having a rectangular outer peripheral cross-sectional shape that is in opposing contact with the adjacent heat transfer tubes as a heat transfer portion. Since the heat transfer tubes are integrated in a state where the heat transfer tubes for the first fluid and the heat transfer tubes for the second fluid are alternately positioned in each of two directions orthogonal to the tube core direction, a single first fluid transfer tube is provided. All the flat surfaces of the outermost four surfaces of the heat pipe are heat transfer surfaces for the second fluid, and all of the four outermost flat surfaces of the heat transfer tube for the second fluid are transferable to the first fluid. It is possible to have a hot surface, which makes it possible to obtain extremely high heat transfer efficiency.

[0010] In addition, since a high heat transfer efficiency is obtained as described above, the structure is a simple structure in which heat transfer tubes having a rectangular outer peripheral cross section are simply integrated. In comparison with filling porous metal between the inner tube and the outer tube or making the inner tube a deformed tube to ensure heat transfer efficiency,
In addition, compared to a conventional plate material joined body type in which a plate material having an expanded tube portion for forming a flow path is manufactured using a special large mold, the manufacturing of the heat exchanger is facilitated and the manufacturing cost is reduced. It can be cheap.

In addition, since the stacking target itself is a pipe, each pipe is connected to the inter-plate flow path formed by the bulging portion in the conventional plate-joined type in which a plate-like stacked structure is adopted. The diameter of the connection pipes to the heat transfer tubes can be secured large, and the connection of the pipes to each heat transfer tube can be simplified. In this regard, the heat exchanger can be easily manufactured, and the pressure loss can be reduced. This is also advantageous in terms of reduction of

[2] In the invention according to the second aspect, the outer peripheral cross-sectional shape of the heat transfer tube is set at the gathering position of the corners in the rectangular outer peripheral cross-sectional shape of the heat transfer tube in the heat transfer tube integrated state. The shape is such that a flow path is formed.

That is, according to this configuration, when the heat transfer tube for the first fluid is damaged and the first fluid leaks, or when the heat transfer tube for the second fluid is damaged and the second fluid leaks, The leaked fluid can be guided in the longitudinal direction of the heat transfer tube through the gap flow passage for the leaked fluid located near the damaged portion and can be quickly led out of the heat transfer tube accumulation group. The occurrence of fluid leakage inside can be detected at an early stage.

[3] In the invention according to the third aspect, the first fluid transfer for causing the first fluid passing through one first fluid heat transfer tube to flow in the opposite direction to the nearest first fluid heat transfer tube. A plurality of first fluid heat transfer tubes are sequentially connected by pipes, the first fluid is passed in series to the plurality of first fluid heat transfer tubes, and the second fluid is passed through one second fluid heat transfer tube. A plurality of second fluid heat transfer tubes are sequentially connected by a second fluid transfer tube for causing a fluid to flow in the opposite direction to the nearest second fluid heat transfer tube, and the second fluid is transferred to a plurality of second fluid heat transfer tubes. It is configured to pass in series with the heat tube.

In other words, in this configuration, in the heat transfer tube integrated group, the first fluid is passed in series to the plurality of first fluid heat transfer tubes sequentially connected by the first fluid transfer tube, and A plurality of secondary fluids sequentially connected by a fluid transfer pipe
In the process of passing the second fluid in series through the fluid heat transfer tube, the first fluid and the second fluid undergo heat exchange in a counter-flow system or a parallel-flow system.

According to this structure, the first fluid and the second fluid are passed in series as described above, so that a large flow velocity is ensured and heat transfer between each fluid and the heat transfer tube is promoted. However, a sufficient heat exchange time between the first fluid and the second fluid can be sufficiently ensured, whereby the heat transfer efficiency can be more effectively improved.

[4] In the invention according to claim 4, the heat transfer tubes are integrated between adjacent heat transfer tubes via a soft heat transfer material.

According to this configuration, the above-mentioned soft heat transfer material interposed between the adjacent heat transfer tubes enhances the thermal adhesion between the adjacent heat transfer tubes in the heat transfer tube integrated state, thereby improving the heat transfer between the adjacent heat transfer tubes. It is possible to increase the thermal conductivity between the two, and thereby to improve the heat transfer efficiency more effectively.

[0019]

1 and 2 show a heat exchanger integrated with heat exchanger tubes, in which a heat exchanger tube 1 having a rectangular outer peripheral cross-sectional shape is shown.
A heat transfer tube 1a for the first fluid through which the first fluid A passes,
The heat transfer tubes 1b for the second fluid through which the fluid B passes are arranged in a matrix of 5 rows and 2 columns alternately positioned in each of two directions orthogonal to the tube core direction. Are brought into opposed contact with each other as heat transfer portions.

As shown in FIGS. 1, 2 and 3, at one end of the heat transfer tube integrated group G in the longitudinal direction of the tube, each of the first fluid heat transfer tube 1a and the second fluid heat transfer tube 1b. , The ends of adjacent heat transfer tubes in the same diagonal direction
The heat transfer tubes 1a and 2b are connected at the other end of the heat transfer tube integrated group G in the longitudinal direction of the tube by connecting the first heat transfer tube 1a and the second fluid heat transfer tube 1b. The ends of the heat transfer tubes adjacent to each other in the same diagonal direction opposite to those connected by the transfer tubes 2a and 2b at one end of the accumulation group G are connected by U-shaped transfer tubes 3a and 3b.

The above-mentioned crossover tubes 2a, 2 for each of the first fluid heat transfer tube 1a and the second fluid heat transfer tube 1b.
b, 3a, 3b, the first fluid heat transfer tube 1a is connected in series with the first fluid heat transfer tube 1a at the end of the first fluid heat transfer tube 1a, which is located at both ends thereof, on the side of the non-transfer pipe connection side. A of the inflow / outflow pipes 4 and 5 of A. In the series connection row of the second fluid heat transfer pipes 1b, the second
The second fluid B is connected to the end of the fluid heat transfer tube 1b on the side where the transfer tube is not connected.
Outflow / inflow pipes 6 and 7 are connected.

That is, the first fluid A that has passed through one first fluid heat transfer tube 1a is integrated by the first fluid transfer tubes 2a and 3a that pass in the opposite direction to the nearest first fluid heat transfer tube 1a. As a structure in which the first fluid heat transfer tubes 1a in the group G are sequentially connected, the first fluid A is passed in series through the first fluid heat transfer tubes 1a, and the first fluid heat transfer tubes 1b are passed through one second fluid heat transfer tube 1b. A second fluid transfer pipe 2 for passing the second fluid B in the opposite direction to the nearest second fluid heat transfer pipe 1b
b, 3b, the second fluid heat transfer tube 1b in the accumulation group G
Are connected in sequence to form the second fluid heat transfer tubes 1.
b, the second fluid B is passed in series, and in these passing processes, the first fluid A and the second fluid B are opposed to each other via the opposed contact flat portions of the adjacent heat transfer tubes 1a and 1b (or in parallel flow). Heat exchange).

Further, by adopting a mode in which the first fluid A and the second fluid B are passed through the respective adjacent heat transfer tubes 1a and 1b to exchange heat, the first fluid heat transfer tube 1a may be damaged. Also, the first fluid A that leaks due to the breakage becomes the second fluid B
In addition, even if the second fluid heat transfer tube 1b is damaged, the second fluid B leaking due to the damage can be prevented from being mixed with the first fluid A.

As shown in FIG. 4, each of the heat transfer tubes 1 has a rectangular outer cross-sectional shape in which the corners are dropped by so-called R forming or chamfering. A gap flow path e for a leaked fluid is formed at the gathering position of the corners in the rectangular outer peripheral cross-sectional shape of the heat pipe 1, and when the first fluid heat transfer pipe 1a or the second fluid heat transfer pipe 1b is damaged, The leaked fluid is quickly led out of the accumulation group G through the gap flow path e near the broken point.

In forming the integrated group of the heat transfer tubes 1, a soft heat transfer material 8 is interposed between the outer peripheral flat portions of the adjacent heat transfer tubes 1a and 1b to be opposed to each other as a heat transfer portion. The accumulation group G is bound in a state where the heat transfer tubes 1 are brought into pressure contact with each other by the binding band 9, thereby increasing the thermal adhesion between the adjacent heat transfer tubes 1 a and 1 b to further improve the heat transfer efficiency. It is.

The gap flow path e is provided in the heat transfer tube integrated group G.
Are also used as brazing material insertion holes for brazing and joining the heat transfer tubes 1 to each other at the time of formation.
The heat transfer pipes 1a and 1b adjacent to the gap flow path e are partially or fully extended in the pipe longitudinal direction while leaving the gap flow path e itself and leaving the function of deriving the leaked fluid by the brazing material inserted from the inside. And brazing.

[Another Embodiment] Next, another embodiment will be described.

In order to form the heat transfer tube integrated group G in which the heat transfer tubes 1a for the first fluid and the heat transfer tubes 1b for the second fluid are alternately located in each of two directions orthogonal to the tube core direction. In the embodiment, the example in which the heat transfer tubes 1 are arranged in five rows and two columns has been described, but for example, as shown in FIG.
The number of rows and the number of columns in the heat transfer tube matrix arrangement can be variously changed, for example, by adopting the above arrangement form.

In order to make the outer peripheral cross-sectional shape of the heat transfer tube 1 into a shape in which the gap flow path e for the leakage fluid is formed at the gathering position of the corners in the rectangular outer peripheral cross-sectional shape of the heat transfer tube 1 in the heat transfer tube integrated state. The specific shape is not limited to the shape obtained by the R forming or the chamfering forming described in the above-described embodiment. For example, a groove-shaped portion extending in the tube core direction is formed at a corner in the rectangular outer peripheral cross-sectional shape of the heat transfer tube 1. Various changes, such as a changed shape, are possible.

In the above-described embodiment, the heat transfer tubes 1 adjacent in the same diagonal direction at one end in the tube longitudinal direction in the heat transfer tube integrated group G are connected to each other by the U-shaped transfer tubes 2a and 2b. At the other end in the tube longitudinal direction in the heat transfer tube integrated group G, the heat transfer tubes 1 adjacent to each other in the same diagonal direction are connected to each other by U-shaped transfer tubes 3a and 3b, thereby forming the transfer tube 2a. , 2b, 3a, and 3b avoid crossing each other and facilitate the connection of the transfer pipes. However, when the heat transfer pipes 1 are connected in series, the number of rows and the number of columns in the heat transfer pipe matrix arrangement According to the specific connection form of the transfer pipe, various changes are possible, and depending on the case, the form in which the fluid passes through the heat transfer tubes 1 of the heat transfer tube integrated group G in parallel, the parallel passage and the series passage Adopt a form that combines It may be.

As the soft heat transfer material 8 interposed between the adjacent heat transfer tubes 1a and 1b, various materials can be used as long as the material is softer than the heat transfer tube 1. Alternatively, the interposition of the soft heat transfer material 8 may be omitted, and the outer peripheral flat portions of the adjacent heat transfer tubes 1a and 1b as heat transfer portions may be brought into direct contact with each other.

In the case where the heat transfer tube accumulation group G is bound by the binding band 9, the above-described embodiment shows an example in which the heat transfer tube accumulation group G is bound at a plurality of partial locations in the longitudinal direction of the tube. As shown in FIG. 5, the heat transfer tube integrated group G is bound by the binding band 9 extending over substantially the entire length of the heat transfer tube 1.
Various configurations can be changed for the specific binding structure, and
As shown in FIG. 7, a reinforcing plate 10 that covers the heat transfer tube collecting group G may be provided, and the heat transfer tube collecting group G may be bound from above the reinforcing plate 10.

In the case where the heat transfer tube collecting group G is bound by the wide binding band 9 as shown in FIG. 6, a heat insulating material may be interposed between the binding band 9 and the heat transfer tube collecting group G. In the case where the reinforcing plate 10 as shown in FIG.
In practice, for example, by interposing a heat insulating material between the reinforcing plate 10 and the heat transfer tube accumulation group G, it is desirable to provide a heat insulation material layer covering the heat transfer tube accumulation group G to suppress heat loss.

[Brief description of the drawings]

FIG. 1 is a front view of a heat exchanger.

FIG. 2 is a side view of a heat exchanger.

FIG. 3 is an exploded perspective view of the heat exchanger.

FIG. 4 is an enlarged sectional view of a main part in a side view.

FIG. 5 is a perspective view of a heat exchanger showing another embodiment.

FIG. 6 is a perspective view of a heat exchanger showing another embodiment.

FIG. 7 is a perspective view of a heat exchanger showing another embodiment.

FIG. 8 is a cutaway perspective view showing a conventional example.

FIG. 9 is a perspective view showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat transfer tube 1a 1st fluid heat transfer tube 1b 2nd fluid heat transfer tube 2a, 3a 1st fluid transfer tube 2b, 3b 2nd fluid transfer tube 8 Soft heat transfer material A 1st fluid B 2nd fluid e gap Channel

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Yoshitaka Shibata, Inventor 4-1-2, Hiranocho, Chuo-ku, Osaka-shi, Osaka Prefecture Inside Osaka Gas Co., Ltd. (72) Shin Iwata 4-chome, Hiranocho, Chuo-ku, Osaka-shi, Osaka 1-2-2 Inside Osaka Gas Co., Ltd. (72) Inventor Yasuhito Hashizume 1-152 Oka, Minami-shi, Minato-ku, Osaka-shi, Osaka Prefecture Harman Co., Ltd. No. 1-52 F-term in Harman Co., Ltd. (Reference) 3L103 AA37 AA44 DD06 DD15 DD56

Claims (4)

[Claims] 1. A heat transfer tube having a rectangular outer peripheral cross-sectional shape,
Heat transfer tubes for the first fluid through which the fluid passes and heat transfer tubes for the second fluid through which the second fluid passes alternately in two directions orthogonal to the tube core direction, and adjacent heat transfer tubes The heat exchangers are integrated such that the outer peripheral flat portions are in opposing contact with each other. 2. An outer cross-sectional shape of the heat transfer tube is formed such that a gap flow path for a leaked fluid is formed at a gathering position of a corner in the rectangular outer cross-sectional shape of the heat transfer tube in the heat transfer tube integrated state. The heat exchanger according to claim 1. 3. The first fluid passing through one first fluid heat transfer tube.
A plurality of first-fluid heat transfer tubes are sequentially connected by a first-fluid transfer tube that causes the fluid to flow in the opposite direction to the nearest first-fluid heat transfer tube, and the first fluid is transferred to the plurality of first-fluid transfer tubes. A second fluid that is passed in series with the heat pipe, and the second fluid that has passed through one second fluid heat transfer pipe flows in the opposite direction to the nearest second fluid heat transfer pipe;
The heat according to claim 1 or 2, wherein the plurality of second fluid heat transfer tubes are sequentially connected by the fluid transfer tube, and the second fluid is passed in series to the plurality of second fluid heat transfer tubes. Exchanger. 4. The heat transfer tubes are integrated between adjacent heat transfer tubes via a soft heat transfer material.
The heat exchanger according to any one of the above.