ES2370795T3 - HEAT EXCHANGER OF TUBES AND FINS. - Google Patents

Abstract

A heat exchanger (1, 101) of tubes and fins comprising: heat transfer fins (2, 102) arranged in an air flow; and plural heat transfer tubes (3) that are inserted in the heat transfer fins and disposed in a direction substantially orthogonal to the flow direction of the air flow, in which by means of cutting and lifting, fins of plural guides (21a to 21d, 121a to 121f), on the heat transfer fins, arranged in a straight line from upstream to downstream in the flow direction of the air flow, on the surfaces of the heat transfer fins on both sides of the heat transfer tubes, characterized in that the straight lines (L1, L2) that hypothetically interconnect the plural guide fins are skewed with respect to the direction of the air flow to guide the air flow in the vicinity of the heat transfer tubes to the rear sides of the heat transfer tubes in the direction of flow of the air flow, and the height of each of the guide fins Plurals (21a to 21d, 121a to 121f) gradually increase downstream in the flow direction of the air flow.

Description

Tube and fin heat exchanger

Technical Field

The present invention relates to a tube and fin heat exchanger, and in particular to a tube and fin heat exchanger with heat transfer fins arranged in an air flow and plural heat transfer tubes that are inserted in the heat transfer fins and arranged in a direction substantially orthogonal to the flow direction of the air flow.

Background Technique

Conventionally, tube and fin heat exchangers (i.e. fin and cross tube heat exchangers) with heat transfer fins arranged in an air flow and with plural heat transfer tubes that are inserted into the fins Heat transfer and arranged in a direction substantially orthogonal to the flow direction of the air flow have been widely used in air conditioners and the like.

In such tube and fin heat exchangers, as a heat transfer enhancement technique in order to reduce dead water zones formed in the portions of the heat transfer tubes in the heat transfer fins located downstream of The flow direction of the air flow and for the purpose of renewing the boundary layers of the heat transfer fins, a technique has been used (see JP-A-61-110889) to form, by cutting and lifting the surfaces of the heat transfer fins on both sides of the heat transfer tubes, guide fins that increase in size and open upstream of the flow direction of the air flow.

JP 10 009786 discloses a finned heat exchanger, according to the preamble of claim 5, in which parts of the slat are inclined so that the downstream side in the direction of the slat parts is formed with a height less than the upstream side of these parts.

US 2003/000686 A1, JP 61 006590, JP 02 259 393 A, JP 10 089876 A and JP 10 332291 A disclose various different types of guide fin arrangements in different heat exchangers.

Disclosure of the invention

However, when a tube and fin heat exchanger is used, in which the aforementioned guide fins are used, as an evaporator of a heating medium, such as a refrigerant that uses air as a heat source, such as the air conditioners and the like, the problem arises that the drainage water, which is produced due to the exchange of heat between the air and the heat medium, accumulates in the guide fins and increases the resistance to ventilation. Additionally, when a tube and fin heat exchanger is used, in which the aforementioned guide fins are used, as an external heat exchanger that configures an outdoor unit of an air conditioner, the problem arises that, although Sometimes the frost generated on the surface of the fins of the heat exchanger is eliminated by the defrosting operation, in this case the water drainage capacity decreases.

It is an objective of the present invention that the guide fins of a tube and fin heat exchanger simultaneously achieve a heat transfer enhancing effect and a good water drainage capacity. This objective is solved by a tube and fin heat exchanger according to claim 1. The embodiments are named in the dependent claims.

A tube and fin heat exchanger belonging to the invention comprises: heat transfer fins arranged in an air flow; and plural heat transfer tubes that are inserted into the heat transfer fins and arranged in a direction substantially orthogonal to the flow direction of the air flow. On the heat transfer fins, plural guide fins are formed arranged in a straight line from upstream to downstream in the direction of flow of the air flow, by cutting and raising the surfaces of the heat transfer fins to both sides of the heat transfer tubes. The straight lines that hypothetically interconnect the plural guide fins are skewed with respect to the direction of the air flow to guide the air flow in the vicinity of the heat transfer tubes to the rear sides of the heat transfer tubes in the flow direction of the air flow.

In the present tube and fin heat exchanger, the guide fins are plurally organized from upstream to downstream in the direction of the air flow, and the guide fins are skewed with respect to the direction of the air flow to guide the air flow in the vicinity of the heat transfer tubes to the rear sides of the heat transfer tubes in the direction of air flow flow, so that

mainly the renewal effect of the boundary layers can be obtained reliably by means of the guide fins of the plural guide fins that are arranged on the front sides of the heat transfer fins in the direction of flow of the air flow, and the effect reducing the dead water zones formed on the rear sides of the heat transfer fins in the direction of flow of the air flow can be obtained by the guide fins that are arranged on the rear sides of the heat transfer fins in the flow direction of the air flow, and water drainage from the surface of the heat transfer fins is facilitated, through the separations located between the guide fins. Therefore, an effect of heat transfer enhancement can be obtained by the guide fins without affecting the drainage of water from the surfaces of the heat transfer fins.

Additionally, because the plural guide fins are arranged in a straight line from upstream to downstream in the flow direction of the air flow, the guide fins of the plural guide fins that are arranged on the rear sides of the Heat transfer fins in the flow direction of the air flow have the same inclination as the guide fins of the plural guide fins that are arranged on the front sides of the heat transfer fins in the flow direction of the flow of air, so that not only do they reduce the dead water zones formed in the portions of the rear sides of the heat transfer tubes in the direction of flow of the air flow, but they can prevent new dead zones from forming water at the back of the guide fins.

As described above, in the tube and fin heat exchanger belonging to the present invention, through the guide fins the effect of heat transfer enhancement can be obtained without being affected by water drainage in the surface of the heat transfer fins, and the formation of new dead water zones on the rear sides of the guide fins can be avoided, whereby a heat transfer enhancing effect can be achieved simultaneously by means of the guide fins and a water drain.

In the tube and fin heat exchanger according to the invention, the height of each of the guide fins gradually increases downstream in the flow direction of the air flow.

In the present tube and fin heat exchanger, by giving each of the guide fins a shape whose height gradually increases downstream in the flow direction of the air flow, vertical vortices can be created at the rear of each one of the guide fins, so that the effect of heat transfer enhancement by the guide fins can be further increased.

A heat exchanger of tubes and fins belonging to a second aspect is the heat exchanger of tubes and fins belonging to the first or second invention, in which in the heat transfer fins a water drainage enhancement portion is formed to make the water that accumulates between the guide fins that are mutually adjacent in the straight lines flow down.

In the present tube and fin heat exchanger, the water drainage booster portion is formed between the guide fins, so that the ability to drain water from the guide fins can be further increased.

A heat exchanger for tubes and fins belonging to a third aspect is the heat exchanger for tubes and fins belonging to the third invention, in which the booster portion of the water drain is a groove formed between the guide fins that are mutually adjacent in straight lines.

A tube and fin heat exchanger belonging to a fourth aspect is the tube and fin heat exchanger belonging to the third invention, in which the water drainage enhancement portion is a notch formed in the end portions of the fins. of guide that are mutually adjacent in straight lines, whose end portions are portions that become lower end portions of the guide fins.

A tube and fin heat exchanger belonging to a fifth aspect is the tube and fin heat exchanger belonging to the third invention, in which the water drainage enhancement portion is a water conducting nerve formed between the fins of guide that are mutually adjacent in straight lines.

Brief description of the drawings

FIG. 1 is a cross-sectional diagram of a tube and fin heat exchanger belonging to a first embodiment of the present invention.

FIG. 2 is a cross-sectional diagram taken along line A-A of FIG. one.

FIG. 3 is a cross-sectional diagram taken along line B-B of FIG. one.

FIG. 4 is a diagram showing a tube and fin heat exchanger belonging to a

modification of the first embodiment, the diagram showing the portion C of FIG. one. FIG. 5 is a diagram showing a tube and fin heat exchanger belonging to a modification of the first embodiment, the diagram showing the portion C of FIG. one.

FIG. 6 is a diagram showing a tube and fin heat exchanger belonging to a

modification of the first embodiment, the diagram showing the portion C of FIG. one. FIG. 7 is a cross-sectional diagram of a tube and fin heat exchanger belonging to a second embodiment of the present invention.

FIG. 8 is a cross-sectional diagram taken along line A-A of FIG. 7. FIG. 9 is a cross-sectional diagram taken along line B-B of FIG. 7. FIG. 10 is a diagram showing a tube and fin heat exchanger belonging to a

modification of the second embodiment, the diagram showing portion C of FIG. 7.

FIG. 11 is a diagram showing a tube and fin heat exchanger belonging to a modification of the second embodiment, the diagram showing portion C of FIG. 7. FIG. 12 is a diagram showing a tube and fin heat exchanger belonging to a

modification of the second embodiment, the diagram showing portion C of FIG. 7.

Description of reference numbers

1, 101

Tube and fin heat exchangers

2, 102

Heat Transfer Fins

3

Heat Transfer Tube

21a to 21d, 121a to 121f

Guide fins

32, 35, 132, 133, 136, 137

Slots (Portions of Water Drainage Enhancement)

42, 43, 142, 143, 144, 145

Notches (Portions of Water Drainage Empowerment)

52, 151, 154

Water conductive nerves

Better ways of carrying out the invention

In the following, embodiments of a tube and fin heat exchanger belonging to the present invention will be described based on the drawings.

<First realization>

In FIGS. 1 to 3, relevant portions of a tube and fin heat exchanger 1 belonging to a first embodiment of the present invention are shown. In this case, FIG. 1 is a cross-sectional diagram of the heat exchanger 1 of tubes and fins. FIG. 2 is a cross-sectional diagram taken along line A-A of FIG. 1. FIG. 3 is a cross-sectional diagram taken along line B-B of FIG. one.

(1) Basic configuration of the tube and fin heat exchanger

The tube and fin heat exchanger 1 is a fin and cross tube heat exchanger and mainly has plural, plate-shaped heat transfer fins 2, and plural heat transfer tubes 3. The heat transfer fins 2 are arranged so that they are located, in a direction of the thickness of the plate, in a state in which the flat direction thereof is generally along the flow direction of a flow of air. Plural passage holes 2a are formed in the heat transfer fins 2 at intervals and in a direction substantially orthogonal to the flow direction of the air flow. The portions around the passage holes 2a serve as portions 23 of the annular collar that protrude to the side in the direction of the thickness of the plate of the heat transfer fins 2. The collar portions 23 make contact with the surfaces of the adjacent heat transfer fins 2, in the direction of the plate thickness, which are opposite to the surfaces on which the collar portions 23 are formed, so that ensures a predetermined H interval between each of fins 2 of

heat transfer in the direction of plate thickness. Heat transfer tubes 3 are tube elements within which a heat medium such as a refrigerant flows; The heat transfer tubes 3 are inserted in the heat transfer fins 2, which are arranged to be located in the direction of the plate thickness, and are arranged in a direction substantially orthogonal to the flow direction of the air flow . Specifically, the heat transfer tubes 3 penetrate the through holes 2a formed in the heat transfer fins 2 and come into close contact with the inner surfaces of the collar portions 23 as a result of the tube expansion work during the heat exchanger assembly 1 of tubes and fins.

Additionally, the tube and fin heat exchanger 1 of the present invention is used in a state in which the direction of arrangement of the heat transfer tubes 3 is a substantially vertical direction. For this reason, the air flow flows so that it crosses through the heat exchanger 1 of tubes and fins in a substantially horizontal direction. It should be noted that in the following description, when a language such as "upper side" or "up" and "lower side" or "down" is used, this will indicate the direction of arrangement of the heat transfer tubes 3.

(2) Detailed Shape of Heat Transfer Fins

Next, the detailed form of the heat transfer fins 2 used in the tube and fin heat exchanger 1 of the present embodiment will be described.

On the plural heat transfer fins 2 (in the present embodiment, two), a set of guide fins 21a and 21b and a set of guide fins 21c and 21d are formed, arranged in a straight line from upstream to downstream in the flow direction of the air flow, by cutting and raising the surfaces of the heat transfer fins 2 on both sides of each of the heat transfer fins 3 (i.e. the lower side and the upper side of each of the heat transfer fins 3). The straight lines L1 and L2 that hypothetically interconnect the guide fins 21a and 21b and the guide fins 21c and 21d are skewed with respect to the flow direction of the air flow to guide the air flow in the vicinity of the tubes 3 of heat transfer to the rear sides of the heat transfer tubes 3 in the flow direction of the air flow. In this case, the angles of attack a1 and a2 that the straight lines L1 and L2 form with respect to the flow direction of the air flow are set to be within the range of between 10 ° and 30 °.

Additionally, each of the guide fins 21a to 21d is formed such that its height gradually increases downstream in the flow direction of the air flow. In the present embodiment, each of the guide fins 21a to 21d is substantially trapezoidal or substantially triangular (see FIG. 3; FIG. 3 is a diagram showing the guide fins 21c and 21d, but the guide fins 21a and 21b also have the same shape) and is formed such that its maximum height h is less than the height H of the collar portions 23. Additionally, slot holes 22a to 22d, which are formed in the heat transfer fins 2 when the guide fins 21a to 21d are cut and raised, are arranged on the far sides of the heat transfer fins 3, the guide fins 21a to 21d being interposed therebetween.

(3) Characteristics of tube and fin heat exchanger

In the tube and fin heat exchanger 1 with the aforementioned configuration, the guide fins formed on both sides of each of the heat transfer tubes 3 are divided into plural groups (in the present embodiment, two), the group of the guide fins 21a and 21b and the group of the guide fins 21c and 21d, from upstream to downstream in the flow direction of the air flow, and the group of the guide fins 21a and 21b and the group of the guide fins 21c and 21d are biased with respect to the flow direction to guide the air flow in the vicinity of the heat transfer tubes 3 to the rear sides of the heat transfer tubes 3 in the direction of flow of the air flow, so that mainly the renewal effect of the boundary layers can be obtained reliably by means of the guide fins 21a and 21c of the guide fins 21a to 21d which are arranged on the front sides of the The heat transfer fins 2 in the direction of flow of the air flow, and the effect of reducing the dead water zones that form on the rear side portions of the heat transfer fins 3 in the direction of air flow flow can be obtained by the guide fins 21b and 21d which are arranged on the rear sides of the heat transfer fins 2 in the flow direction of the air flow, and the drainage of the water produced can be facilitated on the surfaces of the heat transfer fins 2 between the guide fins 21a and 21b and between the guide fins 21c and 21d. Therefore, an effect of heat transfer enhancement can be obtained by the guide fins 21a to 21d without affecting the water drainage that occurs on the surfaces of the heat transfer fins 2.

Additionally, because the guide fins 21a and 21b and the guide fins 21c and 21d are arranged in a straight line on lines L1 and L2, from upstream to downstream in the direction of air flow, the guide fins 21b and 21d of the guide fins 21a to 21d which are arranged on the rear sides of the fins 2 of

Heat transfer in the flow direction of the air flow have the same inclination as the guide fins 21a and 21c which are arranged on the front sides in the flow direction of the air flow, so that they not only reduce dead zones of water formed in the portions of the rear sides of the heat transfer tubes 3 in the direction of flow of the air flow, but can prevent the formation of new dead areas of water at the rear of the guide fins 21b and 21d.

As described above, in the heat exchanger 1 of tubes and fins of the present embodiment, by means of the guide fins 21a to 21d an effect of heat transfer enhancement can be obtained without it being affected by the water drainage on the surface of the heat transfer fins 2, and the formation of new dead water zones on the rear sides of the guide fins 21b and 21d can be avoided, whereby the guide fins can be achieved simultaneously a potentiating effect of heat transfer and water drainage.

Additionally, in the present heat exchanger 1 of tubes and fins, by giving each of the guide fins 21a to 21d a shape whose height gradually increases downstream in the flow direction of the air flow, vertical vortices can be formed at the rear of each of the guide fins 21a to 21d, so that the effect of heat transfer enhancement can be further increased by each of the guide fins 21a to 21d.

(4) Modifications

In the aforementioned tube and fin heat exchanger 1, grooves 32 and 35 can be formed (see FIG. 4), notches 42 and 43 (see FIG. 5), or a water conducting lip 52 (see FIG. 6) that serve as a drainage enhancement portion to cause water to accumulate between guide fins 21a and 21b and guide fins 21c and 21d that are mutually adjacent on straight lines L1 and L2 flow down, to facilitate water drainage from the surfaces of the heat transfer fins 2 through the gaps between the guide fins 21a and 21b and between the guide fins 21c and 21d. In this case, FIGS. 4 to 6 are diagrams showing portion C of FIG. 1 when each type of booster portion of the water drain is formed in the heat transfer fins 2.

First, a case will be described in which the grooves 32 and 35 are formed in the heat transfer fins 2, using FIG. 4. In the present modification, the grooves 32 and 35 are formed, to intersect with the vertical lines L1 and L2 in the vertical direction, in the separation portions between the guide fins 21a and 21b that are mutually adjacent on the line L1 and between the guide fins 21c and 21d that are mutually adjacent on the straight line L2. In this case, the grooves 32 and 35 are given a narrow groove width by forming incisions in the heat transfer fins 2, for example, to ensure that the grooves 32 and 35 do not affect, to the extent of the possible, to the heat transfer performance. Additionally, grooves 31, 33, 34 and 36 may also be formed that are the same as grooves 32 and 35 in the end portions of the guide fins 21a to 21d instead of the separation portions between the guide fins 21a and 21b and between guide fins 21c and 21d.

Next, a case will be described in which notches 42 and 43 are formed in the heat transfer fins 2, using FIG. 5. In the present modification, the notches 42 and 43 are formed in the end portions of the guide fins 21a and 21b and the guide fins 21c and 21d which are mutually adjacent on the straight lines L1 and L2, whose end portions are they transform into lower end portions of the guide fins 21a and 21b and the guide fins 21c and 21d (ie, the portions that become lower portions of the guide fins 21a and 21b and the guide fins 21c and 21d a along the direction of the gravitational force). Specifically, the notches 42 and 43 are formed in the lower end portion of the guide fin 21b and in the lower end portion of the guide fin 21c. In this case, the notches 42 and 43 are vertical incisions formed in the lower end portions of the guide fins 21b and 21c so that they communicate with the grooves 22b and 22c that are formed by forming the guide fins 21c and 21c by cutting and lifting Additionally, notches 42 and 43 that are equal to notches 42 and 43 can also be formed in the end portions of the guide fins 21a and 21d instead of the portions that are transformed into the lower end portions of the guide fins 21b and 21c.

Next, a case will be described in which the water-conducting nerve 52 is formed in the heat transfer fins 2, using FIG. 6. In the present modification, the water conducting rib 52 is formed, to intersect with the straight lines L1 and L2 in the vertical direction, at the separation portions between the guide fins 21a and 21b that are mutually adjacent on the line straight L1 and between the guide fins 21c and 21d that are mutually adjacent on the straight line L2. In this case, the water-conducting nerve 52 is a long and narrow projection that extends upward and is formed by pressing the surfaces of the heat transfer fins 2, and the water-conducting nerve 52 is formed to continuously interconnect , in the vertical direction (i.e., the direction of the gravitational force), the separation portion between the guide fins 21a and 21b and the separation portion between the guide fins 21c and 21d. It should be noted that, in the vicinity of

heat transfer tubes 3, the water conducting rib 52 cannot extend in a straight line in the vertical direction, so that only forming a circular arc portion thereof in the vicinity of the collar portion 23, can be maintained a state in which the water conducting nerve 52 is formed substantially in the direction of the gravitational force. Additionally, the water conducting ribs 51 and 53, which are equal to the water conducting rib 52, can also be formed in the front side portion of the guide fins 21a and 21c in the flow direction of the air flow and in the rear side portion of the guide fins 21b and 21d in the direction of flow of the air flow, instead of in the separation portion between the guide fins 21a and 21b and in the separation portion between the guide fins 21c and 21d.

As described above, in the heat exchanger 1 of tubes and fins of the present modification, the ability of the heat transfer fins 2 to drain water can be further increased given that the grooves 32 and 35, the notches 42 and 43, or the water conducting rib 52 serving as a water drainage booster portion are formed between the guide fins 21a and 21b that are mutually adjacent on the straight line L1 and between the guide fins 21c and 21d that are mutually adjacent on the straight line L2.

<Second embodiment>

In FIGS. 7 to 9, relevant portions of a tube and fin heat exchanger 101 belonging to a second embodiment of the present invention are shown. In this case, FIG. 7 is a cross-sectional diagram of the heat exchanger 101 of tubes and fins. FIG. 8 is a cross-sectional diagram taken along line A-A of FIG. 7. FIG. 9 is a cross-sectional diagram taken along line B-B of FIG. 7.

(1) Tube and fin heat exchanger configuration

The basic configuration of the tube and fin heat exchanger 101 is the same as that of the tube and fin heat exchanger 1 of the first embodiment except for the guide fins 121a to 121f of the heat transfer fins 102 described below. . For this reason, the description related to the basic configuration of the tube and fin heat exchanger 101 will be omitted, changing the reference numbers referring to the heat transfer fins 102 from 10 to 100.

Next, the detailed form of the heat transfer fins 102 used in the tube and fin heat exchanger 101 of the present embodiment will be described.

On the plural heat transfer fins 102 (in the present embodiment, three), a set of guide fins 121a, 121b and 121c and a set of guide fins 121d, 121e and 121f are formed, arranged in a straight line of current up to downstream in the flow direction of the air flow, by cutting and raising the surfaces of the heat transfer fins 2 on both sides of each of the heat transfer fins 3 (i.e. the bottom side and the upper side of each of the heat transfer fins 3). The straight lines L1 and L2 that hypothetically interconnect the guide fins 121a, 121b and 121c and the guide fins 121d, 121e and 121f are skewed with respect to the flow direction of the air flow to guide the air flow in the vicinity from the heat transfer tubes 3 to the rear sides of the heat transfer tubes 3 in the flow direction of the air flow. In this case, the angles of attack a1 and a2 that the straight lines L1 and L2 form with respect to the flow direction of the air flow are set to be within the range of between 10 ° and 30 °.

Additionally, each of the guide fins 121a to 121f is formed such that its height gradually increases downstream in the flow direction of the air flow. In the present embodiment, each of the guide fins 121a to 121f is substantially trapezoidal or substantially triangular (see FIG. 9; FIG. 9 is a diagram showing guide fins 121d, 121e and 121f, but the fins guide 121a, 121b and 121c also have the same shape) and is formed such that its maximum height h is less than the height H of the collar portions 123. Additionally, slot holes 122a to 122f, which are formed in the heat transfer fins 102 when the guide fins 121a to 121f are cut and raised, are arranged on the far sides of the heat transfer fins 3, being guide fins 121a to 121f interposed therebetween.

As described above, in the tube and fin heat exchanger 101 of the present embodiment configured as described above, although the guide fins of the tube and fin heat exchanger 1 of the first embodiment had a structure of two divisions comprising the set of the guide fins 21a and 21b and the set of the guide fins 21c and 21d, in this case the guide fins have a three-division structure comprising the set of guide fins 121a, 121b and 121c and the set of guide fins 121d, 121e and 121f, so that the amount of spacing between the guide fins increases to drain water from the surfaces of the heat transfer fins 102. For this reason, the ability to drain water can be increased compared to the heat exchanger 1 of tubes and fins of the first embodiment.

(2) Modifications

In the tube and fin heat exchanger 101 mentioned above, similar to heat exchanger 1

5 of tubes and fins of the first embodiment, grooves 132, 133, 136 and 137 can also be formed (see FIG. 10), notches 142, 143, 144 and 145 (see FIG. 11), or a lip 152 and 153 water conductor (see FIG. 12), serving as a drainage enhancement portion to cause water to accumulate between guide fins 121a and 121b, between guide fins 121b and 121c, between guide fins 121d and 121e, and between guide fins 121e and 121f which are mutually adjacent on straight lines L1 and L2 flow down,

10 to facilitate water drainage from the surfaces of the heat transfer fins 102 through the recesses between the guide fins 121a and 121b, between the guide fins 121b and 121c, between the guide fins 121d and 121e, and between guide fins 121e and 121f. In this case, FIGS. 10 to 12 are diagrams showing portion C of FIG. 7 when each type of water drainage enhancement portion is formed in the heat transfer fins 102.

15 It should be noted that, because the shapes, and the like, of the grooves, the grooves and the water-conducting ribs are the same as those of the grooves 32 and 35, the grooves 42 and 43, and the conductive ribs 52 of water belonging to the first embodiment, the description thereof will be omitted. Additionally, in this heat exchanger 101 of tubes and fins, similar to the heat exchanger 1 of tubes and fins belonging to the modifications of the first embodiment, grooves 131, 134, 135 and 138 can also be formed,

20 notches 141 and 146, or lips 151 and 154 water conductors in portions other than those located between guide fins 121a and 121b, between guide fins 121b and 121c, between guide fins 121d and 121e, and between guide fins 121e and 121f.

<Other realizations>

Embodiments of the present invention have been described above based on the drawings, but the

25 specific configurations thereof are not limited to these embodiments and may be altered within a range that does not depart from the essence of the invention.

Industrial applicability

Using the present invention, an effect of enhancing heat transfer and water drainage can be achieved simultaneously, by means of the guide fins, in a tube and fin heat exchanger.

Claims (5)

1. A heat exchanger (1, 101) of tubes and fins comprising: heat transfer fins (2, 102) arranged in an air flow; Y plural heat transfer tubes (3) that are inserted in the heat transfer fins and arranged in a direction substantially orthogonal to the flow direction of the air flow, in which by means of cutting and lifting, plural guide fins (21a to 21d, 121a to 121f) are formed, on the heat transfer fins, arranged in a straight line from upstream to downstream in the airflow flow direction, in the surfaces of the heat transfer fins on both sides of the heat transfer tubes,  characterized because the straight lines (L1, L2) that hypothetically interconnect the plural guide fins are skewed with respect to the direction of the air flow to guide the air flow in the vicinity of the heat transfer tubes to the rear sides of the tubes of heat transfer in the flow direction of the air flow, and the height of each of the plural guide fins (21a to 21d, 121a to 121f) gradually increases downstream in the flow direction of the air flow. 2. The heat exchanger (1, 101) of tubes and fins of claim 1, wherein in the heat transfer fins (2, 102) there is formed a portion of water drainage enhancement to make the water that accumulates between the guide fins (21a to 21d, 121a to 121f) that are mutually adjacent on the straight lines (L1, L2) flow down. 3. The heat exchanger (1, 101) of tubes and fins of claim 1 or 2, in which the boosting portion of the water drain is a groove (32, 35, 132, 133, 136, 137) formed between the guide fins (21a to 21d, 121a to 121f) that are mutually adjacent on the straight lines (L1, L2). 4. The heat exchanger (1, 101) of tubes and fins of claim 1 or 2, in which the boosting portion of the water drain is a notch (42, 43, 142, 143, 144, 145) formed in the end portions (21a to 21d, 121a to 121f) of the guide fins that are mutually adjacent on the straight lines (L1, L2), whose end portions are transformed into lower end portions of the guide fins. 5. The heat exchanger (1, 101) of tubes and fins of claim 1 or 2, wherein the water drainage enhancement portion is a water conducting nerve (52, 151, 154) formed between the guide fins (21a to 21d, 121a to 121f) that are mutually adjacent on straight lines (L1, L2).