JPH1026488A - Multitube type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a performance of heat exchange while preventing an increase in a draft resistance, by a construction wherein a plurality of heat transfer plates wherein insertion holes for a plurality of thin tubes are formed so that the outer peripheries of the thin tubes come into contact therewith wholly or partially are provided between paired tanks, in a multitube type heat exchanger wherein the paired tanks are made to communicate with each other by the thin tubes. SOLUTION: In a multitube type heat exchanger 1, a pair of tanks 2 and 3 are made to communicate with each other by thin tubes 4 and an inflow tube 5 making a refrigerant as a heating medium flow into the heat exchanger 1 and an outflow tube 6 making the refrigerant flow out of the heat exchanger 1 are connected to the tank 2. A plurality of heat transfer plates 8 wherein insertion holes 9 through which the thin tubes 4 are inserted so that the outer peripheries thereof come into contact with the holes partially and drain holes 10 for draining condensate are formed are provided between the paired tanks 2 and 3. The refrigerant made to flow in from the inflow tube 5 is circulated through the heat exchanger 1 and then made to flow out of the outflow tube 6 and, in this course, it exchanges heat with air for heat exchange passing through the heat exchanger 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-tube heat exchanger used, for example, in a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger used in a vehicle air conditioner or the like, a fin-and-tube heat exchanger as shown in FIG. 12 and a multi-tube heat exchanger as shown in FIG. 13 have been known. Have been. In the fin-and-tube heat exchanger 101 shown in FIG. 12, an air flow 102 flowing at substantially right angles from the front side of the core traverses each tube 104 between adjacent fins 103 and flows substantially straight. The heat medium and the refrigerant introduced from the inlet pipe 105 are circulated in the heat exchanger 101 through the distribution pipe 106 and each tube 104,
The air is discharged through the merging pipe 107 and the outlet pipe 108, and heat is exchanged between the air flowing through the heat exchanger 101 and the air.

On the other hand, in the multi-tubular heat exchanger 110 shown in FIG. 13, a heat medium and a refrigerant introduced from an inlet pipe 112 are circulated in upper and lower tanks 113 and 114 and a narrow pipe 115, and are passed through an outlet pipe 116. The heat is exchanged with the air 111 that is discharged and passes through the heat exchanger.

[0004]

However, in the heat exchanger 101, the airflow 102 flows mainly straight ahead in the gap defined by the adjacent fins 103 and the tubes in the heat exchanger 101. , Heat exchanger 110
In this case, the airflow 111 flows so as to cover the gap of the thin tube 115, so that the airflow resistance increases. In particular, when the number of the arranged thin tubes 115 is increased in order to improve the heat exchange efficiency, the ventilation resistance is further increased. For this reason, it has been difficult to improve the heat exchange performance in a well-balanced manner while preventing an increase in ventilation resistance.

When the heat exchangers 101 and 110 are applied to an air conditioner for a vehicle or the like, the fins 103 of the heat exchanger 101 are set to be horizontal due to restrictions on installation space and the like. In some cases, the heat exchanger 101 must be installed such that the direction in which the thin tubes 115 of the 110 extend is horizontal (hereinafter, such a method of installing the heat exchanger is referred to as “horizontal installation”). , 110 are placed horizontally, the condensed water is likely to be retained on the surfaces of the fins 103 and the thin tubes 115, which may cause adverse effects such as an increase in airflow resistance and scattering of the condensed water, and the degree of freedom of installation is reduced. In some cases.

An object of the present invention is to provide a multi-tubular heat exchanger capable of improving heat exchange performance without increasing ventilation resistance and improving the degree of freedom of installation.

[0007]

In order to solve the above-mentioned problems, a multi-tube heat exchanger according to the present invention is a multi-tube heat exchanger in which a pair of tanks communicate with each other by a plurality of thin tubes. A plurality of heat transfer plates provided with through holes for the thin tubes are provided between the tanks so that all or a part of the outer circumferences of the plurality of thin tubes are in contact with each other.

Preferably, the heat transfer plate is provided with a drain hole for draining condensed water attached to the surface of the heat transfer plate. The drain hole may be provided so as to be connected to the insertion hole. Further, it is desirable that the drain hole is provided on the downstream side in the direction in which the heat exchange air passes.

It is preferable that a tubular collar which comes into contact with the thin tube is provided around the insertion hole of the heat transfer plate.

[0010] The heat transfer plate may be provided with a louver.

Incidentally, a circular tube, an elliptic tube or the like can be used as the thin tube constituting the multi-tube heat exchanger according to the present invention.

[0012] In the above-mentioned multi-tube heat exchanger,
Since a plurality of heat transfer plates are provided in contact with all or a part of the outer periphery of the thin tube, a plurality of heat conduction paths are formed between the thin tube and the plurality of heat transfer plates, and the heat exchange area is greatly reduced. It is enlarged. For this reason, the heat exchange performance can be greatly improved as compared with the conventional multi-tube heat exchanger in which heat exchange is performed only by the thin tube. Further, since the heat transfer plate extends along the direction in which the heat exchange air passes, the increase in the ventilation resistance can be suppressed relatively low. Therefore, it is possible to improve the heat exchange performance by increasing the heat exchange area without increasing the number of arranged thin tubes, and at the same time, it is possible to suppress the increase in the ventilation resistance to be low.

Further, if the heat transfer plate is provided with a drain hole, the heat exchanger having the plurality of heat transfer plates can be heat-exchanged such that the thin tubes of the heat exchanger extend in the vertical direction. Even if a heat exchanger is installed (hereinafter, such a method of installing a heat exchanger is referred to as "vertical installation"), drain the condensed water downward from the surface of the heat transfer plate through the drain holes without fail. Can be. In addition, when the heat exchanger is placed horizontally, the heat transfer plate can have a function of a condensed water guide plate, and the condensed water is smoothly drained downward along the heat transfer plate. .

If the drain hole is provided so as to be connected to the insertion hole through which the thin tube is inserted, it is possible to simultaneously provide the heat transfer plate with the drain hole and the insertion hole in one step, thereby improving workability and cost. It can also contribute to down.

If the drain hole is provided downstream in the direction of passage of the heat exchange air, the condensed water is effectively drained from the drain hole by utilizing the flow of the heat exchange air passing through the heat exchanger. can do. In addition, since the area on the downstream side in the direction of passage of the heat exchange air in the insertion hole is a part where the heat exchange air is difficult to flow and the heat exchange efficiency is relatively low compared to other areas, a drain hole is provided in this part. However, the heat exchange performance of the heat transfer plate is slightly reduced.

By providing a collar in contact with the thin tube around the insertion hole of the heat transfer plate, the contact between the thin tube side and the heat transfer plate side can be ensured, and the transfer from the thin tube to the heat transfer plate can be performed more efficiently. Heat conduction can be performed. Therefore, the heat exchange efficiency of the heat transfer plate, that is, the heat exchange performance of the heat exchanger itself can be further improved.

If the heat transfer plate is provided with a louver, the heat exchange efficiency of the heat transfer plate can be further improved.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the multitubular heat exchanger according to the present invention will be described below with reference to the drawings. In the following description, the heat exchanger is placed vertically. 1 and 2 show a multitubular heat exchanger according to a first embodiment of the present invention. Multi-tube heat exchanger 1
Has a pair of tanks 2, 3,
Are communicated with each other by a thin tube 4. In the present embodiment, the thin tube 4 is constituted by a circular tube. The tank 2 has an inflow pipe 5 through which a refrigerant as a heat medium flows into the heat exchanger 1 and an outflow pipe 6 through which the refrigerant flows out of the heat exchanger 1.
And are connected. Further, side plates 7 are provided on both side surfaces of the heat exchanger 1.

Between the pair of tanks 2 and 3, there are provided a plurality of heat transfer plates 8 each having an insertion hole 9 through which the thin tube 4 is inserted so that a part of the outer periphery of the thin tube 4 comes into contact. The contact portion between the thin tube 4 and the heat transfer plate 8 is preferably joined by brazing. Further, the heat transfer plate 8 is provided with a drain hole 10 for draining condensed water, and the drain hole 10 is connected to the insertion hole 9. The drain hole 10 is provided downstream of the insertion hole 9 in the direction in which the heat exchange air passes (the direction of the arrow in FIG. 2).

In the heat exchanger 1 according to this embodiment,
The refrigerant flowing from the inflow pipe 5 circulates inside the heat exchanger 1 and then flows out of the outflow pipe 6. During this time, heat exchanger 1
Heat is exchanged with the heat exchange air passing through the inside.

Further, since the heat exchanger 1 is provided with a plurality of heat transfer plates 8 which are in contact with (preferably brazed) a part of the outer periphery of the thin tube 4, the thin tube 4 and the plurality of heat transfer plates are provided. 8, a plurality of heat conduction paths are formed, and the heat exchange area is greatly increased. Therefore, the heat exchange efficiency is greatly improved as compared with the conventional multi-tube heat exchanger in which heat exchange is performed only by the thin tube 4. As shown in FIGS. 1 and 2, since the heat transfer plate 8 extends in the direction in which the heat exchange air passes, the increase in the ventilation resistance due to the installation of the heat transfer plate 8 is relatively large. Low.

Further, since the heat transfer plate 8 is provided with the drain hole 10, the condensed water adhered to the surface of the heat transfer plate 8 can be reliably drained downward through the drain hole 10.
It is possible to prevent increase in ventilation resistance and scattering of condensed water. Note that the condensed water attached to the surface of the thin tube 4 flows on the lower heat transfer plate 8 with which the thin tube 4 comes into contact, so that the condensed water is similarly drained downward from the drain hole 10.

In this embodiment, the drain hole 10
In the manufacturing process of the heat transfer plate 8, the drain hole 10 and the insertion hole 9 can be provided simultaneously in one step. Therefore, the workability of the heat transfer plate 8 can be improved, and the manufacturing cost can be effectively suppressed.

Further, since the drain hole 10 is provided on the downstream side of the insertion hole 9 in the direction of passage of the heat exchange air, the heat transfer plate 8 is formed by the flow of the heat exchange air passing through the heat exchanger 1. The condensed water attached to the surface flows into the drain hole 10. Therefore, the condensed water can be efficiently drained. The downstream area is a part where heat exchange air is less likely to flow and active heat exchange is not performed as much as the other areas.
Even if 0 is provided, the heat exchange performance of the heat transfer plate 8 is slightly reduced.

Further, since a plurality of heat transfer plates 8 are provided between the upper and lower tanks 2 and 3, the heat transfer plates 8 can also contribute to prevention of warpage and bending of the thin tube 4.

When the heat exchanger 1 is placed horizontally, the condensed water adhering to the surfaces of the heat transfer plate 8 and the thin tube 4 is drained smoothly down the heat transfer plate 8. It can be used both vertically and horizontally, and the degree of freedom of application in the air conditioner is improved.

Further, the shape of the drain hole 10 provided in the heat transfer plate 8 is not particularly limited.
The shape shown in FIG. FIG.
The shape shown in FIG. in this case,
By expanding the opening of the drain hole 10, the condensed water can be drained more efficiently.

FIG. 5 shows a heat transfer plate 11 of a multi-tube heat exchanger according to a second embodiment of the present invention. The heat transfer plate 11 has an insertion hole 12 through which the thin tube 4 is inserted so that the entire outer periphery of the thin tube 4 comes into contact. Also, the heat transfer plate 11
A drain hole 13 is provided independently of the insertion hole 12. The drain hole 13 is provided downstream of the insertion hole 12 in the direction in which the heat exchange air passes (the direction of the arrow in FIG. 5).

In this embodiment, the insertion hole 12
A tubular collar (burring) 14 that comes into contact with the outer periphery of the thin tube 4 is provided upright.

Even in the configuration as in the present embodiment, the heat exchange performance of the heat exchanger can be improved while preventing an increase in ventilation resistance according to the first embodiment. In addition, regardless of the installation method of either the vertical installation or the horizontal installation, the condensed water can be reliably drained from the heat transfer plate 11 or the like.

Further, in this embodiment, since the thin tube 4 is in contact with the heat transfer plate 11 via the collar 14, heat can be conducted from the thin tube 4. Needless to say, the thin tube 4 and the heat transfer plate 11 may be joined by brazing. In other words, since the thin tube 4 is held by the collar 14, the warpage or bending of the thin tube 4 can be more reliably prevented, and the arrangement pitch of the heat transfer plates 11 can be determined. . Note that the collar 14 can be a separate component from the heat transfer plate 11.

FIG. 6 shows a heat transfer plate 15 of a multi-tube heat exchanger according to a third embodiment of the present invention. The heat transfer plate 15 has an insertion hole 16 through which the thin tube 4 is inserted so that a part of the outer periphery of the thin tube 4 comes into contact. The heat transfer plate 15
Is provided with a drain hole 17, which is connected to the insertion hole 16. The drain hole 17 is
Is provided downstream of the heat exchange air passing direction (the direction of the arrow in FIG. 6). Around the insertion hole 16, a tubular collar 14 that comes into contact with the outer periphery of the thin tube 4 is provided upright. In this embodiment, the heat transfer plate 15 and the collar 14 are made of different members.

Also in the configuration of this embodiment, the heat exchange performance of the heat exchanger can be improved while preventing an increase in the ventilation resistance according to the second embodiment. In any of the vertical and horizontal installation methods, the heat transfer plate 1
Condensed water can be reliably drained from 5 and the like.

FIG. 7 shows a heat transfer plate 18 of a multi-tube heat exchanger according to a fourth embodiment of the present invention. The heat transfer plate 18 has an insertion hole 19 through which the thin tube 4 is inserted so that a part of the outer periphery of the thin tube 4 comes into contact. Also, the heat transfer plate 18
Is provided with a drain hole 20, which is connected to the insertion hole 19. The drain hole 20 is inserted through the insertion hole 19.
Is provided on the downstream side of the heat exchange air passing direction (the direction of the arrow in FIG. 7).

In this embodiment, the heat transfer plate 18
Is provided with a louver 21.

Also in the present embodiment, the heat exchange performance of the heat exchanger can be improved while preventing an increase in ventilation resistance, according to the first embodiment. In addition, the condensed water can be reliably drained from the heat transfer plate 18 in any of the vertical and horizontal installation methods.

In this embodiment, the heat transfer plate 18
Since the louvers 21 are provided on the heat transfer plate 18, the heat exchange performance of the heat transfer plate 18 and the heat exchange performance of the heat exchanger can be more efficiently improved.

FIG. 8 shows an air conditioner 30 to which a multi-tube heat exchanger 22 according to a fifth embodiment of the present invention is applied.
The heat exchanger 22 is provided with a heat transfer plate 2 having an insertion hole 24 through which the thin tube 4 is inserted so as to contact a part of the outer periphery of the thin tube 4.
3 are provided. The heat transfer plate 23 is provided with a drain hole 25 for draining condensed water.
Is connected to the insertion hole 24.

The air conditioner 30 has an air passage 31.
A branch path 32 is branched from the air path 31. The heat exchanger 22 is provided at a branch portion of the branch passage 32. The wind path 31 and the branch path 32 are provided with rotary dampers 33, 3.
4 are provided. And in the air conditioner 30, by adjusting the amount of rotation of the dampers 33, 34,
The direction of the air for heat exchange in the heat exchanger 22 is changed, and the air for heat exchange that has undergone heat exchange flows out to the air passage 31 and / or the branch passage 32.

In this embodiment, the opening direction of the drain hole 25 provided in the heat transfer plate 23 is determined according to the wind direction of each branch of the heat exchange air (in FIGS. 8 and 9, the inflow direction of the heat exchange air). (Obliquely with respect to), good drainage can be ensured for any wind direction.
Further, according to the wind direction of the heat exchange air, for example, FIG.
An embodiment as shown in FIG. 11 may be employed.

[0041]

As described above, with the multi-tube heat exchanger of the present invention, the heat exchange performance of the heat exchanger can be improved while preventing an increase in ventilation resistance. Further, in any of the vertical and horizontal installation methods, the condensed water can be reliably drained from the heat transfer plate or the like, so that the degree of freedom in installation can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a multitubular heat exchanger according to a first embodiment of the present invention.

FIG. 2 is an enlarged partial cross-sectional view of the heat exchanger of FIG. 1 taken along the line II-II.

FIG. 3 is an enlarged partial cross-sectional view of a heat exchanger provided with a heat transfer plate of another mode different from that of FIG. 2;

FIG. 4 is an enlarged partial cross-sectional view of a heat exchanger provided with a heat transfer plate of still another mode different from that of FIG. 2;

FIG. 5 is an enlarged partial sectional view of a heat exchanger according to a second embodiment of the present invention.

FIG. 6 is an enlarged partial sectional view of a heat exchanger according to a third embodiment of the present invention.

FIG. 7 is an enlarged partial cross-sectional view of a heat exchanger according to a fourth embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of an air conditioner to which a heat exchanger according to a fifth embodiment of the present invention is applied.

FIG. 9 is an enlarged partial cross-sectional view of a heat exchanger according to a fifth embodiment of the present invention.

FIG. 10 is an enlarged partial cross-sectional view of a heat exchanger provided with a heat transfer plate of another mode different from that of FIG. 9;

FIG. 11 is an enlarged partial cross-sectional view of a heat exchanger provided with a heat transfer plate of still another mode different from that of FIG. 9;

FIG. 12 is a perspective view of a conventional fin-and-tube heat exchanger.

FIG. 13 is a perspective view of a conventional multi-tube heat exchanger.

[Explanation of symbols]

 1,22 Multi-tubular heat exchanger 2,3 Tank 4 Thin tube 5 Inflow tube 6 Outflow tube 7 Side plate 8,11,15,18,23 Heat transfer plate 9,12,16,19,24 Insertion hole 10,13 , 17, 20, 25 Drainage hole 14 Collar 21 Louver 30 Air conditioner 31 Air path 32 Branch path 33, 34 Damper

Claims (7)

[Claims] 1. A multi-tube heat exchanger in which a pair of tanks are connected to each other by a plurality of thin tubes, wherein:
A multi-tubular heat exchanger, comprising a plurality of heat transfer plates provided with through holes for the thin tubes so that all or a part of the outer circumferences of the plurality of thin tubes are in contact with each other. 2. The multi-tube heat exchanger according to claim 1, wherein said heat transfer plate is provided with a drain hole for discharging condensed water. 3. The multi-tubular heat exchanger according to claim 2, wherein said drain hole is connected to said insertion hole. 4. The multi-tubular heat exchanger according to claim 2, wherein the drain hole is provided on a downstream side in a direction in which the heat exchange air passes. 5. The multi-tubular heat exchanger according to claim 1, wherein a tubular collar that comes into contact with said thin tube is provided around an insertion hole of said heat transfer plate. 6. The multitubular heat exchanger according to claim 1, wherein a louver is provided on the heat transfer plate. 7. The multi-tube heat exchanger according to claim 1, wherein the thin tube is a circular tube.