KR20220101401A - Fin tube heat exchanger - Google Patents

Abstract

The present invention relates to a fin tube heat exchanger. The fin tube heat exchanger of the present invention includes: a plurality of fins separately arranged in one direction; and a plurality of tubes which are extended long to to penetrate the plurality of fins and in which a heat exchange medium flows therein. The fins include: a plurality of fin collars into which the tubes are inserted; a flat unit extended to be levelled from the outer circumferential surface of the fin collars to an outer radius direction; an inner inclination unit extended to be inclined outwards from the flat unit; and an outer inclination unit disposed on the outside of the inner inclination unit to be connected to the inner inclination unit, bent a plurality of times to be inclined for an air flowing direction, and forming a plurality of valleys and peaks. The valleys include: inner valleys overlapped with the tubes in a direction that the valleys are extended; and outer valleys disposed on the outside of the tubes in a direction that the valleys are extended. The peaks are disposed between the inner valleys and the outer valleys in a direction that the peaks are extended. Relations of (H1/P1 + H2/P2) < (L + D2 + t)/24 may be satisfied when it is supposed that a distance between the inner valleys and the peaks is defined as P1, a distance between the outer valleys and the peaks is defined as P2, and an external diameter of the flat unit is defined as D2 in the air flowing direction, a distance between the flat unit and the peaks is defined as H1 and a distance between the inner valleys and the peaks is defined as H2 in a longitudinal direction of the tube, and a distance between a flat unit of any one fin of the plurality of fins and a flat unit of another fin adjacent to the any one fin is defined as L and a thickness of the fin is defined as t in the longitudinal direction of the tube. The present invention may provide a fin tube heat exchanger having a fin shape with an improved heat exchange rate and relieved air pressure loss.

Description

Fin tube heat exchanger {FIN TUBE HEAT EXCHANGER}

The present invention relates to a fin tube heat exchanger, and more particularly, to a fin tube heat exchanger having a fin shape with increased heat exchange efficiency and less pressure loss to air.

In general, a heat exchanger may be used as a condenser or an evaporator in a refrigeration cycle device comprising a compressor, a condenser, an expansion mechanism, and an evaporator. The heat exchanger may be installed in a vehicle, a refrigerator, or an air conditioner, and may exchange refrigerant with air.

The heat exchanger may be classified into a fin tube type heat exchanger, a micro channel type heat exchanger, and the like. The heat exchanger may include a tube through which the refrigerant passes, and a header connected to the tube to distribute the refrigerant to the tube.

In the case of a fin tube type heat exchanger, a fin for heat exchange and a tube through which the refrigerant passes may be combined. A flow space through which air passes may be provided between the fin and the tube. As the air passes between the fins and the tubes, it can exchange heat with the refrigerant flowing through the tubes.

Meanwhile, Korean Patent No. 10-0543599, which is a prior art, discloses a pin that is bent a plurality of times to be inclined with respect to the flow direction of air. The fin may be referred to as a corrugate fin.

However, in the case of a fin having a shape similar to the fin, heat exchange efficiency is relatively low within a general numerical range, and there is a problem in that the pressure loss to the air is relatively large (see FIG. 10 ). Alternatively, although the heat exchange efficiency is large, the pressure loss to air is very large, or, conversely, there is a case where the pressure loss to the air is small but the heat exchange efficiency is also very small. In fact, since the heat exchange efficiency and the pressure loss to the air are mutually inversely related, it is very difficult to improve both at the same time. This will be additionally described later with reference to FIG. 10 .

On the other hand, in the fin tube heat exchanger, the tube may be provided in a plurality of rows along the flow direction of the air. Air passing through the fin tube heat exchanger may be introduced to the front heat side and discharged to the rear heat side. Korean Patent Application Laid-Open No. 10-2015-0047027, which is one of related prior art, discloses a heat exchanger in which air flows into a front heat exchange unit and passes through a post heat heat exchange unit.

In the case of the prior art, when air is heat-exchanged with the refrigerant while sailing from the front heat side to the rear heat side, the amount of heat exchange between the air and the refrigerant is maximum at the front heat side, and as the air gets closer to the back heat side, the heat exchange amount gradually decreases ( 13 and 14). That is, in the prior art, the increase in the amount of heat exchange according to the increase in the heat of the tube was significantly reduced.

Nevertheless, by designing the same shape of the fin tube on the front side and the back side, there was a problem in that the heat exchange efficiency at the back heat side was low and the air pressure loss was high.

Republic of Korea Patent Publication No. 10-0543599 (Registration date January 09, 2006) Republic of Korea Patent Publication No. 10-2015-0047027 (published on May 04, 2015)

The problem to be solved by the present invention is to solve the above problems.

Another object of the present invention is to provide a fin tube heat exchanger having a fin shape having an optimal heat exchange efficiency while having a low air pressure loss.

Another object of the present invention is to provide a fin tube heat exchanger having a different amount of heat exchange at one side and the other side.

Another object of the present invention is to provide a fin tube heat exchanger having different air pressure loss from one side and the other side.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, a fin tube heat exchanger according to an embodiment of the present invention includes a plurality of fins spaced apart in one direction; and a plurality of tubes extending long and penetrating the plurality of fins and having a heat exchange medium flowing therein, wherein the fins include: a plurality of fin collars into which the tubes are inserted; a flat portion extending in a radially outward direction from the outer peripheral surface of the pin collar; an inner inclined portion extending obliquely outwardly from the flat portion; and an outer slope disposed on the outside of the inner slope, connected to the inner slope, and bent a plurality of times to be inclined with respect to the flow direction of air to form a plurality of valleys and ridges, wherein the valleys are the valleys In this extended direction, the inner bone overlapping the tube; and a lateral bone disposed on the outside of the tube in the direction in which the bone extends, wherein the crest is disposed between the medial bone and the lateral bone in the direction in which the crest is extended, and the flow of the air In the direction, the distance between the medial bone and the crest is P1, the distance between the lateral bone and the crest is P2, the outer diameter of the flat part is D2, and in the longitudinal direction of the tube, the distance between the flat part and the crest is P2 The distance is H1, the distance between the medial bone and the crest is H2, and in the longitudinal direction of the tube, the distance from the flat part of one of the plurality of fins to the flat part of the other fin adjacent to the one fin is L And, when the thickness of the fin is defined as t, the fin may satisfy the relation of (H1/P1 + H2/P2) < (L+D2+t)/24.

Accordingly, it is possible to implement a fin tube heat exchanger having high heat exchange efficiency and low air flow loss.

The H1 may be greater than the H2.

The pin may satisfy the relation of (H1/P1 + H2/P2) < (L+D2+t)/24, (H1/P1 + H2/P2) >= (L+D2+t)/30 .

The pin may satisfy H2 < H1 < 2 (H2).

The pin may satisfy the relation of (H1/P1 + H2/P2) < (L+D2+t)/30.

The pin may satisfy a relationship of 2(H2) < H1.

If the angle formed by the outer inclined surface portion connecting the crest and the lateral bone with respect to the flow direction of air is defined as theta 1 and the angle formed by the inner inclined surface with respect to the flow direction of air is defined as theta 2, theta 1 is the may be less than theta 2.

The angle formed by the lateral slope connecting the crest and the lateral bone with respect to the flow direction of air is called theta 1, and the angle formed by the external sloping part connecting the medial valley and the crest with the flow direction of the air is called theta 3. By definition, theta 3 may be smaller than theta 1 .

One side of the plurality of pins has a relationship of (H1/P1 + H2/P2) < (L+D2+t)/24, (H1/P1 + H2/P2) >= (L+D2+t)/30 , and the other side of the plurality of pins may satisfy a relationship of (H1/P1 + H2/P2) < (L+D2+t)/30.

The details of other embodiments are included in the detailed description and drawings.

According to the fin tube heat exchanger of the present invention, there are one or more of the following effects.

First, it is possible to provide a fin tube heat exchanger having a fin shape in which heat exchange efficiency and air pressure loss are improved at the same time.

Second, it is possible to provide a fin tube heat exchanger designed to have a higher heat exchange amount on one side having higher heat exchange efficiency than the other side.

Third, on the other side, the heat exchange efficiency is lower than on the one side, the amount of heat exchange is lower, it is possible to provide a fin tube heat exchanger designed to reduce the flow loss of air.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a fin tube heat exchanger according to an embodiment of the present invention;
2 is a plan view of the pin 10 viewed from the y-axis direction.
3 is a perspective view of a unit pin 10U;
4 is a plan view of the unit pin 10U viewed from the z-axis direction.
5 is a perspective view of a plurality of pins 10 arranged.
FIG. 6(a) is a cross-sectional view of a plurality of fins 10 and a tube 20 cut along I-I' of FIG. 5 as viewed in the z-axis direction. Figure 6 (b) is a plan view of the plurality of fins 10 and the tube 20 of Figure 5 viewed in the z-axis direction.
Figure 7 (a) is a cross-sectional view of the first pin (10a) as the pin (10) according to an embodiment of Figure 6 (a). Figure 7 (b) is a plan view of the second pin (10b) as the pin (10) according to an embodiment of Figure 6 (b).
Figure 8 (a) is a cross-sectional view of the second pin (10b) as the pin (10) according to another embodiment of Figure 6 (a). Figure 8 (b) is a plan view of the second pin (10b), which is a pin (10) according to another embodiment of Figure 6 (b).
9 is a table showing numerical values according to an embodiment of the first pin 10a and the second pin 10b of the present invention.
10 is a table showing numerical values for an example of a first fin 10a and a second fin 10b according to an embodiment of the present invention and a third fin 10c to be compared.
11 is a diagram showing a flow analysis of air for the first fin (10a), the second fin (10b) and the third fin (10c) according to the numerical value of FIG.
12 is a perspective view of a fin tube heat exchanger according to another embodiment of the present invention.
13 is a plan view of a fin of a conventional fin-tube heat exchanger viewed from the y-axis.
14 is a graph showing the amount of heat exchange as the number of fins of the conventional fin tube heat exchanger increases.
15 is a plan view of the pin 10 according to the first embodiment of FIG. 12 as viewed from the y-axis. Specifically, as for the pin 10, a first pin 10a is applied to one side, and a second pin 10b is applied to the other side.
16 is a plan view of the pin 10 of FIG. 15 as viewed from the z-axis.
17 is a plan view of the pin 10 according to the second embodiment of FIG. 12 as viewed from the y-axis.
18 is a plan view of the pin 10 of FIG. 17 as viewed from the z-axis.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Spatially relative terms "below", "beneath", "lower", "above", "upper", etc. It can be used to easily describe the correlation between components and other components. Spatially relative terms should be understood as terms including different orientations of components in use or operation in addition to the orientation shown in the drawings. For example, when a component shown in the drawing is turned over, a component described as “beneath” or “beneath” of another component may be placed “above” of the other component. can Accordingly, the exemplary term “below” may include both directions below and above. Components may also be oriented in other orientations, and thus spatially relative terms may be interpreted according to orientation.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural, unless specifically stated otherwise in the phrase. As used herein, "comprises" and/or "comprising" means that a referenced component, step and/or action excludes the presence or addition of one or more other components, steps and/or actions. I never do that.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

In the drawings, the thickness or size of each component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Also, the size and area of each component do not fully reflect the actual size or area.

Hereinafter, the present invention will be described with reference to the drawings for explaining a fin tube heat exchanger according to an embodiment of the present invention according to the embodiments of the present invention.

Hereinafter, the coordinate system shown in the drawings is defined. The x-axis direction may be defined as a front-back direction. The x-axis direction may be the same as the flow direction of air. The x-axis direction may be the same as a direction in which columns formed by the plurality of tubes 20 are arranged. The y-axis direction may be defined as a left-right direction. The y-axis direction may be the same as the arrangement direction of the pins 10 . The y-axis direction may be the same as the longitudinal direction of the tube 20 . The z-axis direction may be defined as an up-down direction. The z-axis direction may be the same as the direction of a column formed by the tube 20 . The z-axis direction may be the same as the direction in which the valleys 142 and 143 and the crest 141 extend.

Hereinafter, referring to FIG. 1 , the fin tube heat exchanger may include a plurality of fins 10 and a plurality of tubes 20 . The plurality of pins 10 may be arranged to be spaced apart in the y-axis direction. The plurality of pins 10 may be disposed parallel to each other.

The tube 20 may extend long in the y-axis direction and penetrate the plurality of fins 10 . The plurality of tubes 20 may be arranged in the z-axis direction to form a column.

A heat exchange medium may flow inside the tube 20 . The heat exchange medium introduced into the inlet 20a of the tube 20 may be discharged to the outside through the outlet 20b after passing through the inside of the tube 20 . The heat exchange medium may pass through the tube 20 and transfer heat to the plurality of fins 10 .

Air may pass through a flow space formed between the plurality of fins 10 and the plurality of tubes 20 . The air may pass through the flow space and exchange heat with the heat exchange medium through the fins 10 and the tubes 20 .

Hereinafter, referring to FIGS. 2 and 3 , a plurality of pin collars 11 may be formed on the pin 10 . The pin collar 11 may be formed in a cylindrical shape. The pin collar 11 may protrude from the pin 10 in the longitudinal direction of the tube 20 to extend.

The tube insertion hole 111 may be formed inside the pin collar 11 . The tube 20 may be inserted into the tube insertion hole 111 formed in the pin collar 11 . The flow path 21 is formed inside the tube 20 so that the heat exchange medium can flow.

The pin collar 11 may be arranged in plurality along the z-axis direction to form one tube column C. The tube column C may be formed by arranging a plurality of unit fins 10U in the z-axis direction. The tube rows C formed by the pin collar 11 may be arranged along the flow direction of air to form a plurality of tube rows C.

The front row C1 may be disposed closer to the air inflow direction than the rear row C2 . The rear row C2 may be disposed downstream of the front row C1. Air passing through the fin tube heat exchanger may be introduced to the front heat (C1) side and discharged to the rear heat (C2) side.

The flat portion 12 may be formed to extend flatly in a radially outward direction from the outer peripheral surface of the pin collar 11 . The flat portion 12 may be formed parallel to the flow direction of air. The flat portion 12 may be formed perpendicular to the pin collar 11 . The flat portion 12 may have a ring shape. The inner peripheral end of the flat portion 12 may be integrally formed with the outer peripheral surface of the pin collar 11 .

The inner inclined portion 13 may be formed to extend obliquely outward from the flat portion 12 . The inner inclined portion 13 may be inclined with respect to the flow direction of the air. The inner inclined portion 13 may surround the flat portion 12 . The inner inclined portion 13 may extend radially outward from the outer peripheral end of the flat portion 12 in the longitudinal direction of the pin collar 11 .

The outer inclined portion 14 may be disposed outside the inner inclined portion 13 to surround the inner inclined portion 13 . The outer inclined portion 14 may be connected to the outside of the inner inclined portion 13 .

The outer inclined portion 14 may be bent a plurality of times with respect to the flow direction of the air. The outer inclined portion 14 may be bent a plurality of times to form a plurality of ridges 141 and valleys 142 and 143 . The inner inclined portion 13 may form a boundary line 141a in the portion of the outer inclined portion 14 adjacent to the floor 141 .

The crest 141 and the valleys 142 and 143 may extend along the z-axis direction, respectively. The plurality of ridges 141 and valleys 142 and 143 may be arranged along the air flow direction.

Referring to FIG. 4 , when viewed from the z-axis direction, the floor 141 may be symmetrically disposed about the pin collar 11 along the air flow direction.

The bone (142, 143) may include a medial bone 142 and a lateral bone (143).

The medial bone 142 may overlap the tube 20 in the z-axis direction, which is the direction in which the medial bone 142 extends. The medial bone 142 may be disposed so that an imaginary line extending the medial bone 142 passes through the tube 20 .

The lateral bone 143 may be disposed on the outside of the tube 20 in the z-axis direction, which is the direction in which the lateral bone 143 extends. The lateral bone 143 may be arranged such that an imaginary line extending the lateral bone 143 is located on the outside of the tube 20 .

The crest 141 may be disposed between the medial bone 142 and the lateral bone 143 in the z-axis direction, which is the direction in which the crest 141 extends. The crest 141 may be disposed outside the tube 20 in a direction in which the crest 141 extends.

The floor 141 may be symmetrically disposed with respect to the pin collar 11 in the direction in which the floor 141 extends. The lateral bone 143 may be symmetrically disposed about the pin collar 11 in the direction in which the lateral bone 143 extends. The medial bone 142 may be disposed adjacent to the center of the pin collar 11 in the direction in which the medial bone 142 extends.

The outer inclined surface 14 may include an edge portion 144 extending parallel to the flat portion 12 outward from the lateral bone 143 . The outer inclined surface 14 may not include the edge portion 144 .

5 and 6 , the plurality of fins 10 may be arranged along the longitudinal direction of the tube 20 . The plurality of pins 10 may be arranged in parallel with each other. The flow space (A) may be formed between the plurality of fins (10). Air passes through the flow space (A) and may exchange heat with the heat exchange medium through the fins (10).

The pin collar 11 formed on any one pin 10 of the plurality of pins 10 may be in contact/coupled with the pin collar 11 formed on the other pin 10 of the plurality of pins 10 . have. For example, the spacing between the plurality of pins 10 may be adjusted according to the length of the pin collar 11 protruding from the pin 10 .

7 to 9 , the numerical values to be described later are based on a view in the z-axis direction.

D1 may be defined as the diameter of the tube 20 .

D2 may be defined as the width of the flat portion 12 in the air flow direction. D2 may be defined as the outer diameter of the flat portion 12 .

t may be defined as the thickness of the fin 10 .

S may be defined as the width of the unit fin 10U in the air flow direction (see FIGS. 2 and 3 ). S, in the flow direction of air, may be defined as the distance between the lateral bones (143).

R may be defined as the length of the unit pin 10U in the z-axis direction, which is the extension direction of the crest 141 and the valleys 142 and 143 (refer to FIGS. 2 and 3 ).

L is, in the longitudinal direction of the tube 20 , from the flat portion 12 of one of the plurality of fins 10 to the flat portion of the other fin 10 adjacent to the one fin 10 . It can be defined as the distance to (12). L is, in the longitudinal direction of the tube 20 , from the crest 141 of one of the plurality of fins 10 to the crest 141 of the other fin 10 adjacent to the one fin 10 . ) can be defined as the distance to L may be determined according to the length in which the pin collar 11 formed on each pin 10 extends in the vertical direction.

H1 may be defined as the distance from the flat portion 12 to the ridge 141 with respect to any one fin 10 in the longitudinal direction of the tube 20 .

H2 may be defined as the distance from the medial bone 142 to the crest 141 with respect to any one fin 10 in the longitudinal direction of the tube 20 .

H3 is, in the longitudinal direction of the tube 20 , from the crest 141 of one of the plurality of fins 10 to the flat portion 12 of the other fin 10 adjacent to the one fin 10 . It can be defined as the distance to

Ls, along the longitudinal direction of the tube 20, may be defined as the length of the inner inclined portion 13 inclinedly extended.

W may be defined as the width of the inner inclined portion 13 in the air flow direction. The width of the inner inclined portion 13 may be defined as the maximum distance between the boundary lines 141a of the inner inclined portion 13 in the air flow direction.

P1 may be defined as the distance between the medial bone 142 and the crest 141 in the flow direction of the air.

P2 may be defined as a distance between the crest 141 and the lateral bone 143 in the flow direction of air.

P3 may be defined as the distance from the lateral bone 143 to the end of the edge portion 144 in the flow direction of the air. P3 may be zero.

theta 1 may be defined as an angle formed by the portion of the outer inclined surface 14 connecting the crest 141 and the lateral bone 143 with respect to the flow direction of the air.

theta 2 may be defined as an angle formed by the inner inclined surface 13 with respect to the flow direction of air.

theta 3 may be defined as an angle formed by the portion of the outer inclined surface 14 connecting the medial bone 142 and the crest 141 with respect to the flow direction of the air.

theta 1 , theta 2 , and theta 3 may be acute angles of less than 90 degrees. theta 1 may be smaller than theta 2 . And, theta 3 may be less than theta 1.

9( a ) is a numerical value according to one embodiment of the first fin 10a and the second fin 10b . Referring to FIGS. 7, 8 and 9( a ), the diameter D1 of the tube 20 of the first fin 10a and the second fin 10b may be the same as each other.

The outer diameter D2 of the flat portion 12 of the first fin 10a and the second fin 10b may be the same as each other.

The thickness t of the first fin 10a and the second fin 10b may be the same as each other.

In the air flow direction, the width S of the unit fin 10U may be the same as the first fin 10a and the second fin 10b.

In the direction in which the crest 141 and the valleys 142 and 143 extend, the length R of the unit pin 10U may be the same as that of the first pin 10a and the second pin 10b.

9( b ) is a numerical value according to one embodiment of the first fin 10a and the second fin 10b . Referring to FIGS. 7, 8 and 9( b ), L may vary according to fins per inch (FPI). For example, for the pin 10 of 11 FPI, L may be 2.31 mm. For example, for pin 10 of 16 FPI, L may be 1.59 mm. For example, for pin 10 of 18 FPI, L may be 1.41 mm.

In the longitudinal direction of the tube 20, with respect to one of the fins 10, the distance H1 from the flat portion 12 to the ridge 141 is greater than in the first fin 10a, the second fin ( 10b) may be smaller.

In the longitudinal direction of the tube 20, with respect to any one fin 10, the distance H1 from the medial bone 142 to the crest 141 is, than in the first fin 10a, the second fin ( 10b) may be smaller.

In the longitudinal direction of the tube 20 , the distance from the crest 141 of one of the plurality of fins 10 to the flat portion 12 of the other fin 10 adjacent to the one fin 10 . (H3) may be smaller in the second fin 10b than in the first fin 10a. H3 may satisfy the relationship of H3 = L-H1.

In the air flow direction, the distance P1 between the medial bone 142 and the crest 141 may be smaller in the second fin 10b than in the first fin 10a.

In the flow direction of the air, the distance P2 between the crest 141 and the lateral bone 143 may be greater in the second fin 10b than in the first fin 10a.

The sum of P1 and P2 may be the same in the first fin 10a and in the second fin 10b. S may satisfy the relation of S = 2 (P1+P2).

The angle theta 1 formed by the portion of the outer inclined surface 14 connecting the crest 141 and the lateral bone 143 with respect to the flow direction of the air is greater in the second pin 10b than in the first pin 10a. can be smaller

The angle theta 2 formed by the inner inclined surface 13 with respect to the flow direction of the air may be the same in the first fin 10a and the second fin 10b.

The angle (theta 3) formed by the portion of the outer inclined surface 14 connecting the medial bone 142 and the crest 141 with respect to the flow direction of the air is greater in the second pin 10b than in the first pin 10a. can be smaller

Accordingly, when the diameter D1 of the tube 20, the FPI of the fin 10, and the thickness t of the fin 10 are the same, the first fin 10a has a heat transfer area of the second fin 10b. ) can be wider than Although the second fin 10b has a smaller heat transfer area than the first fin 10a, the flow space A may be wider.

Accordingly, under the same conditions as the diameter D1 of the tube 20, the FPI of the fin 10, and the thickness t of the fin 10, the first fin 10a heats up more than the second fin 10b. Efficiency could be better.

Accordingly, in the condition that the diameter D1 of the tube 20, the FPI of the fin 10, the thickness t of the fin 10, etc. are the same, the second fin 10b is more air than the first fin 10a. The pressure loss may be smaller.

10(a) and 10(b) show, based on 11FPI, the first pin 10a and the second pin 10b according to an embodiment of the present invention, and the third pin 10c to be compared. Figures are shown for comparison. And FIG. 11 is a figure which shows the flow analysis with respect to the 1st fin 10a, the 2nd fin 10b, and the 3rd fin 10c.

Referring to FIGS. 10A and 10B , the first pin 10a may satisfy Equation 1 but may not satisfy Equation 2 . And, the second pin 10b may satisfy Equations 1 and 2. Also, the third pin 10c may not satisfy Equations 1 and 2. In addition, the H2 value of the first fin 10a and the second fin 10b may be smaller than H1.

(1) Formula 1: (H1/P1+H2/P2) < (L+D2+t)/24

(2) Equation 2: (H1/P1+H2/P2) < (L+D2+t)/30

The third fin 10c that does not satisfy both Equation 1 and Equation 2 has relatively low heat exchange efficiency compared to the first fin 10a and the second fin 10b that satisfy Equation 1 and Equation 2, and the pressure The loss can be large (see FIGS. 10 and 11 ).

On the other hand, the first fin 10a that satisfies Equation 1 but does not satisfy Equation 2 may have relatively good heat exchange efficiency compared to the second fin 10b.

Conversely, the second fin 10b satisfying Equations 1 and 2 may have a relatively small pressure loss to air compared to the first fin 10a (see FIGS. 10 and 11 ).

In the case of the first fin 10a, a relationship of H2 < H1 < 2 (H2) may be satisfied.

In the case of the second pin 10b, a relationship of 2(H2) < H1 may be satisfied.

In summary, the first and second fins 10a and 10b may have higher heat exchange efficiency and higher air pressure loss than the third fin 10c.

In addition, the first fin 10a may have better heat exchange efficiency than the second fin 10b.

In addition, the second fin 10b may have a smaller pressure loss with respect to the air than the first fin 10a.

12 and 13 , the fin tube heat exchanger may include a plurality of fin tube rows (C). In the fin tube heat exchanger according to FIG. 13 , the unit fins 10U of the front heat FC and the rear heat RC may be identical to each other. In the case of the fin tube heat exchanger according to FIG. 13, as the air moves from the front heat (CF) to the back heat (EF), there is a problem that the increase in the amount of heat exchange according to the increase in the heat of the fin tube (C) is significantly reduced (see FIG. 14 ) ).

15 and 16, in order to solve the above problem, a fin tube heat exchanger according to an embodiment of the present invention is a flow space ( A) is formed, and the flow space (A) may be wider from one side of the fin 10 to the other side. One side of the fin 10 may mean a front row (FC) side, and the other side of the fin 10 may mean a back row (RC) side.

A first pin 10a may be provided at one side of the pin 10 , and a second pin 10b may be provided at the other side of the pin 10 .

Accordingly, the heat transfer area of one side of the fin 10 may be larger than that of the other side of the fin 10 . The other side of the fin 10 has a smaller heat transfer area than one side of the fin 10 , but the flow space A may be wider.

Accordingly, it is possible to reduce the pressure loss of air at the other side of the fin 10 having low heat exchange efficiency, and increase the efficiency.

In some cases, the number of columns in which the first fin 10a and the second fin 10b are provided may be different from each other. For example, the first fins 10a may be provided in five rows on one side of the fin 10 , and the second fins b may be provided in three rows on the other side of the fin 10 .

On the other hand, the flow space (A), from one side of the pin 10 toward the other side may be gradually widened.

For example, a plurality of unit pins 10U having different numerical values may be arranged from one side of the pin 10 to the other side. The unit pin 10U may have a numerical value that is gradually changed from a value close to the first pin 10a to a value close to the second pin 10b as it goes from one side of the pin 10 to the other side. .

17 and 18 , the pin 10 includes a plurality of tube insertion holes 31 , and the tube 20 may be inserted into the plurality of tube insertion holes 32 . The pin 10 may include a plurality of pins slits 32 protruding between the plurality of tubes 20 and/or the tube insertion hole 32 and cut to allow air to pass therethrough. The pinslit 32 may have a shape elongated in the z-axis direction, which is a direction perpendicular to the longitudinal direction of the tube 20 and the flow direction of air.

An area occupied by the plurality of pinslits 32 per unit area may be smaller at the other side of the pin 10 than at one side of the pin 10 . One side of the fin 10 may mean a front row (FC) side, and the other side of the fin 10 may mean a back row (RC) side.

The number of pinslits 32 per unit area may be smaller in the vicinity of the other side of the pin 10 than in the vicinity of one side of the pin 10 .

Accordingly, the heat transfer area of one side of the fin 10 may be larger than that of the other side of the fin 10 . The other side of the fin 10 has a smaller heat transfer area than one side of the fin 10 , but the flow space A may be wider.

Accordingly, it is possible to reduce the pressure loss of air at the other side of the fin 10 having low heat exchange efficiency, and increase the efficiency.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications may be made by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

10: pin
11: pin collar
12: flat part
13: inner slope
14: outside inclined part
141: floor
142: medial bone
143: lateral bone
20: tube

Claims (9)

a plurality of pins spaced apart in one direction; and
and a plurality of tubes extending elongately through the plurality of fins and having a heat exchange medium flowing therein,
The pin is
a plurality of pin collars into which the tube is inserted;
a flat portion extending in a radially outward direction from the outer peripheral surface of the pin collar;
an inner inclined portion extending obliquely outwardly from the flat portion; and
It is disposed on the outside of the inner inclined portion, is connected to the inner inclined portion, is bent a plurality of times to be inclined with respect to the flow direction of air, and includes an outer inclined portion forming a plurality of valleys and ridges,
The goal is
In the direction in which the bone extends, the inner bone overlaps the tube; and
In the direction in which the bone extends, it includes a lateral bone disposed on the outside of the tube,
The floor is
In the direction in which the crest is extended, it is disposed between the medial bone and the lateral bone,
In the flow direction of the air, the distance between the medial bone and the crest is P1, the distance between the lateral bone and the crest is P2, and the outer diameter of the flat part is D2,
In the longitudinal direction of the tube, the distance between the flat portion and the crest is H1, the distance between the medial bone and the crest is H2,
In the longitudinal direction of the tube, a distance from a flat portion of one of the plurality of fins to a flat portion of another fin adjacent to the one fin is L;
When the thickness of the fin is defined as t,
The pin is
(H1/P1 + H2/P2) < (L+D2+t)/24
A fin tube heat exchanger that satisfies the relationship of
The method of claim 1,
The H1 is a fin tube heat exchanger larger than the H2.
The method of claim 1,
The pin is
(H1/P1 + H2/P2) < (L+D2+t)/24
(H1/P1 + H2/P2) >= (L+D2+t)/30
A fin tube heat exchanger that satisfies the relationship of
4. The method of claim 3,
The pin is
H2 < H1 < 2(H2)
A fin tube heat exchanger that satisfies
The method of claim 1,
The pin is
(H1/P1 + H2/P2) < (L+D2+t)/30
A fin tube heat exchanger that satisfies the relationship of
6. The method of claim 5,
The pin is
2(H2) < H1
A fin tube heat exchanger that satisfies the relationship of
The method of claim 1,
If the angle formed by the outer slope connecting the crest and the outer bone with respect to the flow direction of air is defined as theta 1, and the angle formed by the inner slope with respect to the flow direction of air is defined as theta 2,
The theta 1 is a fin tube heat exchanger smaller than the theta 2 .
The method of claim 1,
The angle formed by the lateral slope connecting the crest and the lateral bone with respect to the flow direction of air is called theta 1, and the angle formed by the external sloping part connecting the medial valley and the crest with the flow direction of the air is called theta 3. By definition,
The theta 3 is a fin tube heat exchanger smaller than the theta 1.
The method of claim 1,
One side of the plurality of pins,
(H1/P1 + H2/P2) < (L+D2+t)/24
(H1/P1 + H2/P2) >= (L+D2+t)/30
satisfy the relationship of
The other side of the plurality of pins,
(H1/P1 + H2/P2) < (L+D2+t)/30
A fin tube heat exchanger that satisfies the relationship of

Images