JPH0449494Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a gas-liquid heat exchanger (hereinafter referred to as "gas-liquid heat exchanger") used in water-cooled radiators, oil-cooled oil coolers, condensers using fluorocarbon refrigerants, evaporators, etc. , "heat exchanger" refers to this), and particularly relates to a heat exchanger that is compact, round (annular), has excellent performance, and is easy to manufacture.

[Conventional technology]

Various types of heat exchangers have traditionally been used for this type of application. Typical examples include a block type in which corrugated fins and partition plates are laminated alternately, and a meandering tube type in which tubes are formed in a meandering shape and corrugated fins are arranged between adjacent tubes.These conventional heat exchangers are all based on rectangular shapes.

[Problem that the invention attempts to solve]

However, with such a rectangular shape, the size of the heat exchanger itself inevitably increases, and
Generally, it is necessary to connect piping for supplying and discharging liquids to both the top and bottom or left and right sides, and the entire device is usually quite large, which naturally requires a large installation space. I'm getting old.

Considering the actual usage, such as the installation space, processing around piping, and the shape of the object to be installed, an annular shape (round shape) is often more advantageous, but in reality, liquid The reality is that it is rarely used due to problems with the way the entrance and exit are provided and the manufacturing (processing into an annular shape).

The object of the present invention is to provide a heat exchanger that can be configured in a round shape and very compact, can be expected to have good heat exchange efficiency, and can be easily manufactured by integral brazing.

[Means for solving problems]

As shown in FIGS. 1 to 3, the round heat exchanger according to the present invention has a plurality of circumferential circumferences that are arranged concentrically with a predetermined circumferential interval C between adjacent ones, and are arranged in parallel in the direction of the central axis O. A plurality of sets of round flat tubes 1 having directional communication holes 10 inside, and the circumferential gap C
The fins 4 arranged inside are the basic constituent members,
Both end faces 12, 12 of each of the round tubes are abutted against each other.
is closed by a closing bar 2 interposed between both end faces, and half of the parallel communication holes 10 on each side of each tube are communicated with each other by a communication elongated hole 14 at one end 13b of the tube to provide inbound and return communication. Liquid path A ₁ ,
A ₂ and the other end of the tube 13
A has a long inflow hole 15a and a long outflow hole 15b that communicate with the liquid passages A ₁ and A ₂ , while a through hole 50 a is provided near both ends of the tubes in each circumferential gap C between the tubes. , 50b is inserted, and the through holes 50a, 50b and the inflow/outflow elongated hole 15a,
15b to form liquid collection channels B ₁ and B ₂ on the inlet and outlet sides.

[Effect]

The heat exchanger of the present invention basically has an annular heat exchanger core in which a plurality of flat tubes 1 and fins 4 are alternately stacked, and in particular, wave-shaped fins as shown in the figure are used. This allows a very large heat transfer area to be secured, and the flat tube 1
For each tube, the plurality of communication holes 10... are divided in half, and forward and return liquid passages A ₁ and A ₂ are set, and the structure is such that the liquid moves back and forth between both ends of the tube, so that the tube surface Not only is the temperature distribution highly uniform, but also a high flow rate is ensured, and for these reasons, extremely good heat exchange efficiency can be expected.

Furthermore, the heat exchanger of the present invention is not only round and compact in itself, but also has a round flat tube.
Entrances and exits to, that is, inlet and outlet side liquid collection channels B ₁ ,
Since B ₂ are all located in one place,
The piping for supplying and discharging them is also kept small, making the whole system very compact. Therefore, the installation space can be saved, which is effective in terms of space saving.

Furthermore, the manufacturing method can be similar to that of a general heat exchanger, in which each member is assembled into a predetermined shape and integrally brazed.

That is, round flat tube 1... and fin 4
A brazed joint between each member is achieved by assembling a brazing sheet between them, or by using cladding material coated with brazing material as the fins 4, closing bar 2, spacer bar 5, etc. It is possible.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Fig. 1 shows an embodiment of the present invention, A is a plan view, B is a front view, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a sectional view taken along the line B-B in Fig. 1. FIG.

According to the figure, a plurality (three in the figure) of a set of round flat tubes 1... are arranged concentrically, with a predetermined circumferential interval C between adjacent tubes to provide fins 4. is provided. Each tube 1 has a long flat shape in the direction of the center O axis,
Its internal space is as shown in Figure 3.
Partitions 11 placed at a constant pitch in the direction perpendicular to the axis
A plurality of holes 10 (10 in the figure) divided by ... are arranged in parallel in the width direction, and each hole 10 communicates in the longitudinal direction (circumferential direction) to provide a liquid passage. is forming.

Both butt end surfaces 12 of this round flat tube,
A rectangular bar-shaped closing bar 2 is interposed between the tubes 12, and the openings at both ends of the tube (end openings of the communication hole 10) are closed.

Butt ends 13a, 13 of each flat tube
The area near b is a portion where spacer plates 5 of the fins 4, which will be described later, are adjacent to each other on both sides, and only that portion is formed in a straight line without being curved. The side surface of one end 13b of each flat tube 1 is
A large elongated hole 14 for liquid communication is provided on the side surface by punching out all stages of the partition 11 of the tube communication hole 10. Also, the other end 1 of each flat tube 1
On the side of 3a, there is a small elongated hole 15 with a length that spans the upper half (5 holes in the figure) of the same communication hole 10 (see Figure 3).
A and a small elongated hole 15a having a length corresponding to the lower half are penetrated in two stages, upper and lower. That is, each tube 1
The upper and lower halves of the plurality of communication holes 10 are formed as forward and return liquid passages A ₁ and A ₂ , and both liquid passages
A ₁ and A ₂ are connected to each other by the large elongated hole 14 (hereinafter, the large elongated hole 14 is referred to as a communicating elongated hole), and the two small elongated holes 15a and 15b on the other side are connected to each other in this direction.
It forms the inflow and outflow ports for the reciprocating liquid passage consisting of _A1 and return _A2 (hereinafter referred to as the small elongated hole 15).
a and 15b are called inflow/outflow elongated holes). In addition,
As will be described in detail later, the inflow and
The elongated outflow holes 15a and 15b communicate with each other through through holes 50a and 50b provided in two upper and lower stages in the spacer plate 5, respectively.

Next, reference numerals 3a and 3b are inner and outer side plates, which have circumferential gaps C' and C'' of the same width as the circumferential gap C between the tubes on the inner and outer sides of the group of round flat tubes 1. The straight part of the tube (near both ends of the butt) is placed concentrically with the tube.
Portions L' and L'' corresponding to L are similarly linear.

The fin 4 has a circumferential gap C (hereinafter referred to as
The fins 4 are also arranged in the circumferential gaps C' and C'' (hereinafter abbreviated as the side plate circumferential gap) between the side plates 3a and 3b and the tube 1. The fins 4 are provided around the entire circumference except for the portion occupied by the spacer plate 5.The type of fins 4 is not particularly limited, but from the viewpoint of heat transfer area, the corrugated fins shown in the figure are suitable. This is the most advantageous.As the corrugated fins, an appropriate one may be selected from among plate fins, serrated fins, louver fins, etc., depending on the conditions of use.

The spacer plate 5 has the tube circumferential gap C
. . . and the inner side plate circumferential gap C' is inserted and installed corresponding to the straight line portions L and L'. This spacer plate serves to close both side openings 14', 14' of the communicating elongated hole 14 on the end side that contacts one end 13b (hereinafter referred to as the folded end) of each tube 1. In addition, each plate 5 has through holes 50a and 50b penetrating in the thickness direction at the end side in contact with the other end 13a of the tube 1, except for the innermost one.
are provided in two stages, upper and lower, and these through holes 50
a, 50b are tube 1...other end 13a (hereinafter referred to as
It is located between the upper and lower two stages of small elongated inflow/outflow holes 15a and 15b on the side (referred to as the inlet/outlet end), and communicates them with each other, with one inlet and outlet liquid collection channel B ₁ ,
Forming B ₂ . The inlet liquid collection path B ₁ serves as a header to separate the liquid supplied from the outside into each flat tube 1, and the outlet liquid collection path B ₂ is
It serves as a header that collects the liquid flowing inside each flat tube 1 and discharges it to the outside. Note that the innermost spacer plate has no through holes because there is no tube inside it, and the inner openings of the inflow and outflow long holes 15a and 15b of the innermost tube, that is, the inner openings of both liquid collection channels B ₁ and B ₂ . It's shaped like a blockage.

And, the outer side plate circumferential gap C″ is
Same position as spacer plate 5 above (straight line part)
A port plate 6 is inserted in the port plate 6 (corresponding to L'').The port plate 6 is equipped with inlet and outlet ports 60a and 60b that communicate with the liquid collection channels B ₁ and B ₂ on the inlet and outlet sides, respectively. Supply and discharge to each liquid collection path is performed by connecting external piping (not shown) to both ports 60a and 60b.Through holes are provided in the portions of the outer side plate 3b corresponding to both ports. 30, 30 are open. Note that, contrary to the above, the port plate 6 can also be provided on the inner peripheral side.

In the heat exchanger configured as described above, when a liquid such as water or oil is supplied from the external pipe connected to the inlet port 60a, the supplied liquid flows from the inlet liquid collection path _B1 to each flat tube 1. The liquid enters the outgoing liquid path _A1 , which is comprised of the upper half of the communication holes 10, and flows toward the end 13b. End 13
When it reaches b, the return liquid flow path consisting of the lower half of the communication hole 10 is connected by the communication long hole 14.
Flows into A ₂ , changes direction and returns to A ₂
be distributed. Then, when it returns to the original end 13a side, it flows out to the outlet side liquid collection path _B2 , where the liquid from each tube 1... is collected, and the liquid is transferred to the outlet port 60.
It is discharged from b to the discharge piping.

On the other hand, the gas that exchanges heat with the liquid is sent through the gaps between the tube 1 and the corrugated fins 4 that are stacked alternately.

Heat exchange takes place in this way,
In such a heat exchanger, a large heat transfer area is ensured by a plurality of round flat tubes 1... corrugated fins 4 placed between them, and liquid flows within each flat tube 1. Because of the return and reciprocating circulation, not only the temperature distribution on the tube surface is made uniform, but also a high flow rate is ensured, and as a result, extremely high heat exchange efficiency is achieved.

The heat exchanger as described above can be easily manufactured by integral brazing process like a general heat exchanger. That is, the round flat tubes 1 . . . and the fins 4 . . . are arranged in an alternately stacked state, and the closing bars 2 . At this time, either sandwich the brazing sheet between the flat tube 1 and the fin 4 and assemble them, or use a brazing metal-coated cladding material for each member of the fin 4, spacer plate 5, and port plate 6, and then assemble the whole. It is held in a jig and subjected to vacuum brazing treatment (heating in a vacuum furnace), etc.

[Effect of idea]

As explained above, the heat exchanger of the present invention has an annular shape, that is, a round shape, and has no protrusions other than the pipes connected to either the inner or outer periphery, and is extremely compact overall. The liquid inlet and outlet are located at one location on the periphery, so it does not take up much space for processing around the piping, and the entire structure can be made very compact, reducing installation space and saving space. Moreover, in particular, those having no protrusions on the inner circumferential side as in the embodiment are extremely convenient for application to gas turbine exhaust pipes, round engines, and the like. Moreover, the heat exchanger of the present invention is
In terms of heat exchange efficiency, it is possible to use corrugated fins with a large heat transfer area, and because the liquid moves back and forth within each flat tube, the temperature distribution on the tube surface is made uniform, and a high flow rate is achieved. Excellent performance can be expected due to the fact that Furthermore, this heat exchanger has the advantage that it can be manufactured very easily by integral brazing, which is common for this type of heat exchanger.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, in which A is a plan view and B is a front view. 2 is a cross-sectional view taken along the line A--A in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B--B in FIG. In the figure, 1...Round flat tube, 2...Closing bar, 3...Side plate, 4...Fin, 5...
...Spacer plate, 6...Port plate.

Claims (1)

[Scope of utility model registration request] A plurality of flat tubes 1 which are long in the direction of the center O axis and whose ends 12 and 12 are closed with a closing bar 2 and are formed in an annular shape as a whole are arranged concentrically with a predetermined circumferential gap C, and each of the above circumferential gaps is C, the gap C' between the innermost flat tube and the inner side plate 3a, and the gap C' between the outermost flat tube and the outer side plate 3b.
Inside each flat tube 1 of a round heat exchanger, a fin 4 whose both ends are closed with a spacer plate 5 and whose entire shape is annular is arranged in a gap C'' between
A plurality of circumferential communication holes 10 are formed by partitioning in a direction orthogonal to the center O axis, and one end 13 of each flat tube 1 is formed.
Near a, two small elongated holes 15a and 15b are provided in upper and lower stages, passing through the side surface of the end portion 13a, at a position adjacent to the spacer plate 5 on both sides, and the upper small elongated hole 1
5a is an inlet liquid collection path _B1 which connects the upper halves of the communication holes 10 in each flat tube to each other through a through hole 50a provided in the spacer plate 5 and communicates with the outside, and a small elongated hole 15b in the lower stage. is an outlet side liquid collection path that connects the lower halves of the communication holes 10 in each flat tube to each other via a through hole 50b provided in the spacer plate 5, and also communicates with the outside.
B ₂ , and in the vicinity of the other end 13b of each flat tube 1, at a position adjacent to the spacer plate 5 on both sides, the partition 11 of the tube internal communication hole 10 is punched through the side surface of the end 13b in all stages. By providing the large elongated hole 14 for liquid communication, when liquid is supplied from the outside to the inlet side liquid collection path _B1 , the liquid flows through the liquid passage formed by the communication hole in the upper half of each flat tube 1. After circulating back and forth through the large elongated hole 14 between A ₁ and the liquid passage A ₂ formed by the communication hole in the lower half,
A round heat exchanger characterized in that the liquid is discharged to the outside from the outlet side collection path _B2 .