WO2006132037A1

WO2006132037A1 - Tube for heat exchanger

Info

Publication number: WO2006132037A1
Application number: PCT/JP2006/308299
Authority: WO
Inventors: Jinichi Hiyama; Sachio Koyama
Original assignee: Calsonic Kansei Corporation
Priority date: 2005-06-06
Filing date: 2006-04-20
Publication date: 2006-12-14
Also published as: CN101189485A; US20090223656A1; EP1901021A1; JP2006337005A

Abstract

A tube (10) for a heat exchanger disposed so that an air flow can pass its outer periphery in the lateral direction. The internal inner flow passage (13) is divided into an upstream side flow passage (13a) disposed on the upstream side of the air flow and a downstream side flow passage (13b) disposed on the downstream side of the air flow by a partition wall (14). The partition wall (14) is formed at a position where the width (W1) of the upstream side flow passage (13a) is larger and the width (W2) of the downstream side flow passage (13b) is smaller.

Description

Specification

Tube for heat exchanger

Technical field

The present invention relates to a heat exchanger tube that performs heat exchange between an air flow that flows around an outer periphery and a refrigerant that flows through an internal flow path.

Background art

[0002] A conventional heat exchange tube of this type is disclosed in Patent Document 1.

This heat exchanger tube is composed of an outer wall portion having a flat elliptical cross section and a partition wall that divides the flow path in the outer wall portion into two. The partition wall is composed of two partition pieces that are set at positions where the width of the upstream channel and the width of the downstream channel are the same, and face each other. The heat exchange tube having such a configuration is produced, for example, from a single base plate as follows. Both ends in the width direction of the elongated base plate are bent to form a partition piece. Next, the base plate is bent into a flat elliptical shape, and the partition pieces at both ends are aligned with each other. Then, the surfaces that are brought into contact with each other by bending are joined together by brazing or the like.

[0003] A heat exchanger ^^ is manufactured using the heat exchanger tube thus formed. The heat exchanger is arranged such that an air flow passes through the outer periphery along the width direction of the heat exchanger tube, and the air flow passing through the outer periphery and the refrigerant flowing through the internal upstream side flow channel and the downstream side flow channel are provided. Heat exchange takes place between the two. And since the flow path is divided into two by the partition wall, it is strong against pressure in the direction of crushing the flow path and has excellent pressure resistance.

Patent Document 1: JP-A-10-305341

Disclosure of the invention

[0004] Incidentally, the heat exchange efficiency of the refrigerant flowing through the flow path varies depending on the upstream and downstream positions of the air flow passing through the outer periphery. However, since the partition wall is installed in the conventional heat exchange tube without considering the heat exchange efficiency of such a refrigerant, the heat exchange tube having the partition wall is ^^ in terms of heat exchange efficiency. It was a power that wasn't the best.

[0005] Therefore, the present invention has a partition wall and can improve heat exchange efficiency. The purpose is to provide a heat exchange tube that can be used.

[0006] In order to achieve the above object, a heat exchanger tube according to the present invention includes a heat exchange tube arranged along a direction crossing the air flow so that the air flow passes through the outer periphery along the width direction. An upstream flow path positioned upstream of the air flow, a downstream flow path positioned downstream of the air flow, and a partition wall dividing the upstream flow path and the downstream flow path. The partition wall is arranged so that the width of the upstream flow path is wider than the width of the downstream flow path.

[0007] According to the above configuration, the heat exchange efficiency of the refrigerant flowing through the flow path gradually decreases toward the highest downstream position at the most upstream position of the air flow, and after the downstream position after the central position. The efficiency is low! The pattern remains unchanged, and the heat exchange efficiency is high.In the position, there is no partition wall, all the refrigerant flows and is used for heat exchange, and the heat exchange efficiency is almost the lowest. Since the partition wall is located at the position, the heat exchange efficiency of the heat exchange tube as a whole can be improved.

[0008] In the heat exchanger tube, the upstream flow path may be provided with a protrusion protruding from at least one side of the outer wall.

[0009] According to the above configuration, the upstream flow path is wider than the downstream flow path and is inferior in pressure resistance, but the pressure resistance of the upstream flow path is improved by the protrusion. Therefore, the pressure resistance of the heat exchanger tube as a whole is improved. Further, the protrusion increases the inner peripheral area of the upstream flow path and the surface area of the outer wall, and the flow of the refrigerant flowing in the flow path is more disturbed, contributing to the improvement of heat exchange efficiency.

[0010] In the heat exchanger tube, the protrusions may be provided at a plurality of locations at intervals along the longitudinal direction.

[0011] According to the above configuration, the refrigerant flowing in the upstream flow path is stirred by the plurality of protrusions, and heat exchange is promoted. Therefore, the heat exchange efficiency can be improved.

Brief Description of Drawings

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention and showing an arrangement state of heat exchanger tubes in an air flow path.

FIG. 2 is an overall perspective view of a heat exchanger tube showing a first embodiment of the present invention. The

3 is a cross-sectional view taken along line 3-3 of FIG. 2, showing the first embodiment of the present invention.

FIG. 4 shows the first embodiment of the present invention and is a diagram showing the characteristics of the heat exchange efficiency of the heat exchanger tube.

FIG. 5 is a schematic view of a heat exchanger tube manufacturing apparatus according to the first embodiment of the present invention.

FIG. 6 is a perspective view of a main part of the manufacturing apparatus according to the first embodiment of the present invention.

FIG. 7 shows a first embodiment of the present invention, and (a) to (f) are perspective views respectively showing a process of forming a heat exchanger tube.

FIG. 8 is a perspective view of a main part of a heat exchanger tube, showing a second embodiment of the present invention.

FIG. 9 shows a third embodiment of the present invention and is a perspective view of the main part of a heat exchanger tube.

[Fig. 10] Fig. 10 is a perspective view of a main part of a heat exchanger tube according to a fourth embodiment of the present invention.

FIG. 11 is a perspective view of a main part of a heat exchanger tube according to a fifth embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

[0013] Hereinafter, details of the heat exchanger tube according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the heat exchange 1 is arranged in the air flow path 3 of the air conditioning unit 2. The heat exchange includes a plurality of heat exchange tubes 10 arranged in parallel at intervals and a pair of headers 11 fixed to both ends of the plurality of heat exchange tubes 10. The refrigerant that has flowed into the header 11 flows out of the header 11 through the heat exchange tube 10 through a predetermined path. Each heat exchanging tube 10 is arranged along the direction crossing the air flow so that the air flow in the air flow path 3 passes the outer periphery along the width direction.

[0015] As shown in Figs. 2 and 3, the heat exchanger tube 10 has a flat elliptical cross section. The outer wall portion 12 and the partition wall 14 that divides the flow path 13 in the outer wall portion 12 into two. The flow path 13 is partitioned by a partition wall 14 into an upstream flow path 13 a disposed on the upstream side of the air flow and a downstream flow path 13 b disposed on the downstream side of the air flow. The partitioning position of the partition wall 14 is set to a position where the width W2 (く W1) of the downstream flow path 13b where the width W1 of the upstream flow path 13a is wide becomes narrow. The partition wall 14 is composed of a pair of partition pieces 14a, 14a integrally connected from both ends in the width direction of the outer wall portion 12, and between the partition pieces 14a, 14a and between The tip surface of 14a and the inner surface of the outer wall 12 are brazed.

[0016] The protrusion 15 is provided at a substantially central position in the width direction of the upstream flow path 13a. The projecting portion 15 is composed of a pair of projecting pieces 15a provided at opposite positions of both outer wall portions 12, and the tip surfaces of both projecting pieces 15a, 15a are in contact with each other, and this contact Location Force S Brazed. The protrusion 15 is provided continuously over substantially the entire length of the heat exchange tube 10 in the longitudinal direction.

Next, a manufacturing process of the heat exchanger tube 10 will be described. As shown in FIG. 5, the manufacturing apparatus 20 includes a first folding roll unit 21, an application roll unit 22, a drying unit 23, and a second folding roll unit 24. The first folding roll section 21 is formed by folding both ends of, for example, a long material of aluminum-umum material (see FIG. 7 (a)) 25 wound around in a roll shape, and separating pieces 14a, 14a. And bend the two central force points to form protruding pieces (beads) 15a and 15a (see FIGS. 7 (b) and (c)). As shown in FIG. 6, the coating roll unit 22 includes a material storage unit 26 that stores a mixture of flux, brazing material, and binder, a first transfer roll 27, a second transfer roll 28, and a transfer sheet 29. Yes. Then, a mixed coating material a of flux, brazing material, and binder is applied to the front end surfaces of the cut pieces 14a, 14a on both sides formed by the first folding roll portion 21 and the projecting pieces 15a, 15a at the two force points (see FIG. 6, see Figure 7 (d)). The drying unit 23 volatilizes the binder in the mixed coating material a applied on the material 25. The second bending roll section 24 bends the material 25 bent into a predetermined shape into the shape of the heat exchanger tube 10 (see FIGS. 7 (e) and (f)). The heat exchange tube 10 temporarily assembled as a component part of the heat exchange 1 is heat-treated in a heating furnace to braze the portion where the mixed application material a is applied.

[0018] The heat exchanger tube 10 having the above configuration includes an air flow through the air flow path 3 and an internal flow path 1. Heat is exchanged with the refrigerant flowing through 3. Here, as shown in Fig. 4, the heat exchange efficiency gradually decreases as it goes to the highest downstream at the most upstream position of the airflow, and becomes lower after the downstream position past the central position. Indicates a pattern that remains. In the heat exchanger tube 10, the partition wall 14 does not exist at a position where the heat exchange efficiency is high, and all of the refrigerant flows and is used for heat exchange, so that the partition wall 14 is positioned at a position where the heat exchange efficiency is almost the lowest. Therefore, the heat exchange efficiency as a whole of the heat exchanger tube 10 can be improved.

[0019] In the first embodiment, since the upstream flow path 13a is provided with the protrusion 15, the upstream flow path 13a, which is wider than the downstream flow path 13b, has a strong pressure resistance configuration. Has been. Therefore, the pressure resistance of the heat exchange tube as a whole can be maintained. Further, since the inner peripheral area of the upstream flow path 13a and the surface area of the outer wall part 12 are widened by the protrusion 15, the heat exchange efficiency is improved.

FIG. 8 shows a second embodiment of the present invention and is a partial perspective view of the heat exchanger tube 30. As shown in FIG. 8, in the heat exchanger tube 30 of the second embodiment, the protrusions 31 are provided continuously in the longitudinal direction of the heat exchanger tube as in the first embodiment. It is divided into a plurality of spaces at intervals.

[0021] According to the second embodiment, the refrigerant flowing in the upstream flow path 13a is agitated by the protrusions 31 at a plurality of locations and flows, so heat exchange is promoted. Therefore, the heat exchange efficiency can be improved.

FIG. 9 shows a third embodiment of the present invention and is a partial perspective view of the heat exchanger tube 32. As shown in FIG. 9, the protrusion 33 of the heat exchanger tube 32 of the third embodiment is common in that a plurality of protrusions 33 are provided at intervals similar to those of the second embodiment. It differs from the second embodiment in that it has an elliptical shape that is not an elongated rectangular shape.

[0023] Also in the third embodiment, the refrigerant flowing in the upstream flow path 13a is agitated by the plurality of protrusions 33, and heat exchange is promoted. Therefore, the heat exchange efficiency can be improved.

FIG. 10 shows a fourth embodiment of the present invention and is a partial perspective view of the heat exchanger tube 34. As shown in FIG. 10, the protrusion 35 of the heat exchanging tube 34 of the fourth embodiment is The elliptical shape is the same as that of the third embodiment, except that the direction of the elliptical shape is inclined with respect to the longitudinal direction of the heat exchanger tube 34.

[0025] Also in the fourth embodiment, the refrigerant flowing in the upstream flow path 13a is agitated by the plurality of protrusions 35, and heat exchange is promoted. Therefore, the heat exchange efficiency can be improved.

FIG. 11 shows a fifth embodiment of the present invention and is a partial perspective view of the heat exchanger tube 36. As shown in FIG. 11, the protrusion 37 of the heat exchanging tube 36 of the fifth embodiment has an elliptical shape as in the third and fourth embodiments, but the orientation of the elliptical shape is The difference is that the major axis is directed in the same direction as the longitudinal direction of the heat exchanging tube 36, and the one with the major axis directed in the inclined direction is alternately provided.

[0027] Also in the fifth embodiment, the refrigerant flowing in the upstream flow path 13a is agitated by the plurality of protrusions 37, and heat exchange is promoted. Therefore, the heat exchange efficiency can be improved.

[0028] In the above-described embodiments, the protrusions 15, 31, 33, 35, 37 are a pair of protrusion pieces 15a provided at locations facing each other of the outer wall portion 12 forming the upstream flow path 13a. , (Not shown), but only the protruding piece protruding inward from the location of one of the outer wall portions 12 may also be configured. In each embodiment, both protrusions 15a, 15a (not shown) are formed at the same height and approximately 1Z2 height of the width of the upstream flow path 13a, but one of them is more than 1Z2 height. The height of the other may be lower than the height of 1Z2.

Industrial applicability

[0029] According to the present invention, the heat exchange efficiency of the refrigerant flowing in the flow path gradually decreases as it goes to the highest downstream at the most upstream position of the air flow, and after the downstream position past the central position. This shows a pattern where the efficiency remains low and the state remains high, where the heat exchange efficiency is high, where there is no partition wall, all the refrigerant flows and is used for heat exchange, and the heat exchange efficiency is at the lowest efficiency. Since the partition wall is located at the center, the heat exchange efficiency of the heat exchange tube as a whole can be improved.

Claims

The scope of the claims

[1] A heat exchange tube disposed along a direction crossing the air flow so that the air flow passes through the outer periphery along the width direction,

An upstream flow path located upstream of the air flow;

A downstream flow path located downstream of the air flow;

A partition wall that divides the upstream channel and the downstream channel, and

A heat exchanger tube in which the partition wall is arranged so that the width of the upstream flow path is wider than the width of the downstream flow path.

[2] The heat exchange tube according to claim 1,

The heat exchange tube, wherein the upstream flow path is provided with a protrusion protruding from at least one side of the outer wall.

[3] The heat exchange tube according to claim 2,

The protrusion is a tube for a heat exchanger provided at a plurality of locations at intervals along the longitudinal direction.

[4] The heat exchange tube according to claim 3,

The protrusion is a heat exchanger tube formed in a rectangular shape.

[5] The heat exchange tube according to claim 3,

The protrusion is a tube for heat exchange formed in an elliptical shape.