KR20020004528A - Heat exchanger - Google Patents

Abstract

PURPOSE: A capillary heat exchanger is provided to minimize the pressure loss and to improve the heat transfer efficiency of air by decreasing the number of louvers and changing the shape and angle of louvers. CONSTITUTION: A capillary heat exchanger includes refrigerant tubes(51) and cooling fins(53). The refrigerant tube is used with a capillary tube having a pipe diameter of lower than 6mm. Total 6 rows of louvers(55) are inclined to the reference surface of the cooling fins widthwise. An end of each first, third, fourth and sixth louver(55A,55C,55D,55F) is connected to the cooling fins while the other end is bent up or down to the cooling fins. Both widthwise ends of the second and fifth louvers(55B,55E) are cut from the cooling fins, and both lengthwise ends are connected to the cooling fins. The louver design of the cooling fins is optimized. Thereby, the pressure loss of air is reduced and the heat transfer efficiency is improved.

Description

Fine Tube Heat Exchanger {HEAT EXCHANGER}

The present invention relates to a narrow tubular heat exchanger, and in particular, to reduce the number of louvers formed on the cooling fins so as to be suitable for the narrow tubularization of the refrigerant pipe, and to change the shape and angle of the louvers to optimize the louver design of the cooling fins. It is about the flag.

1 is a block diagram showing the structure of a general heat exchanger, Figure 2 is a plan view showing the structure of a cooling fin used in the heat exchanger according to the prior art, Figure 3 is a cross-sectional view taken along line AA of FIG. The cross-sectional view of the air flowing through the cooling fins according to the prior art is shown.

Referring to FIG. 1, a general heat exchanger includes a refrigerant pipe 1 through which refrigerant flows and a plurality of cooling fins coupled to the refrigerant pipe 1 by expansion pipes to secure a heat exchange area between the refrigerant and air ( 3) to exchange heat between the refrigerant flowing through the refrigerant pipe 1 and the surrounding air.

As shown in FIGS. 2 and 3, the cooling fins 3 of the heat exchanger have a louver 5 for improving the heat transfer efficiency by increasing the contact length between the cooling fins 3 and the air. Are formed.

When a plurality of louvers 5 are formed on the cooling fins 3 as shown in FIG. 4, the air flowing into the cooling fins 3 is inclined to each cooling fin 3 according to the angle of the louver 5. Heat exchanges smoothly between them.

At this time, the number, angle, width, etc. of the louver (5) is a performance factor that greatly affects the performance of the heat exchanger, and the front wind speed, pressure loss, heat transfer amount, water drainage and the like for the heat exchanger when designing the heat exchanger. It is optimally designed considering all of them.

In the above, unexplained reference numeral N 'denotes a louver unworked portion formed to prevent twisting of the cooling fin 3 due to molding on the louvers 5 of the cooling fin 3.

However, the conventional heat exchanger used so far uses a refrigerant pipe 1 having a diameter of 7 mm or 9.52 mm, and is a refrigerant that has recently emerged to obtain various advantages such as price reduction and air pressure loss reduction. It is not suitable for the trend of thin tubularization of pipe (1).

Therefore, it is necessary to reduce the diameter of the refrigerant pipe (1). In this case, when the refrigerant pipe (1) is replaced with a narrow pipe, the width of the cooling fin (3) and each louver (5) formed in the cooling fin (3) ) And the arrangement and shape of the cooling fins (3) and the respective louvers (5) in the form suitable for the tubular tube because the arrangement and shape of both) is set appropriately for the refrigerant pipe (1) having a diameter of 7 mm or 9.52 mm Should be optimized

If the refrigerant pipe 1 is replaced with a narrow pipe and the arrangement and shape of each louver 5 is to be maintained in the existing eight-row form, the width of the cooling fin 3 is reduced due to the reduction in the diameter of the refrigerant pipe 1. Because of this reduced state, the width of each louver 5 should be reduced to about 1 mm or less, which causes a problem that the manufacture of the cooling fins 3 is extremely difficult.

In addition, in the case of narrowing the refrigerant pipe 1, the cooling fins per unit of the refrigerant pipe length decrease in the heat exchange area due to the decrease in the width of the cooling fins 3 in order to prevent the efficiency of the cooling fins 3 from decreasing. In order to solve the problem by increasing the number of, at this time, if the louver (5) of the same type as the existing in the cooling fin (3) increases the air side pressure loss is greatly increased by using a fine tube in the refrigerant pipe (1) There is no advantage.

Therefore, in order to use the narrow tubular heat exchanger in which the narrow tubular tube is applied to the coolant tube 1, it is necessary to develop a cooling fin 3 having louvers 5 formed in an arrangement and shape suitable for the narrow tubular refrigerant tube 1. .

The present invention has been made to solve the above problems, the optimization of the louver design of the cooling fins by reducing the number and the shape and angle of the louvers formed on the cooling fins so as to be suitable for the fine tube diameter of the refrigerant pipe. The purpose is to provide a tubular heat exchanger that minimizes air pressure loss and maximizes heat transfer efficiency.

1 is a configuration diagram showing a structure of a general heat exchanger,

Figure 2 is a plan view showing the structure of a cooling fin used in the heat exchanger according to the prior art,

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view showing the flow of air passing between the cooling fins according to the prior art,

5 is a plan view showing the structure of a cooling fin used in the tubular heat exchanger according to the present invention;

6 is a cross-sectional view taken along the line B-B of FIG.

7 is a plan view showing a structure of a cooling fin according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

51: refrigerant pipe 53: cooling fin

55: louver

C: Virtual circle formed by the trajectory of the line connecting the longitudinal ends of each louver

Lt: Pin Tip Length of Cooling Fin

Ld1: width of the first, third, fourth, and sixth row louvers

Ld2: Width of the second and fifth row louvers

According to the present invention, a thin tubular heat exchanger includes a refrigerant pipe through which a refrigerant flows and a plurality of cooling fins coupled to the refrigerant pipe to secure a heat exchange area between the refrigerant and the air. The refrigerant pipe is made of a narrow tube having a diameter of 6 mm or less, and each of the cooling fins has a total of six rows of louvers inclined with respect to the reference plane of the cooling fins in the width direction of the cooling fins. The louvers of the first row, the third row, the fourth row, and the sixth row are formed in the form of a half louver connected to the cooling fins at one of both ends in the width direction, and the second row and the second row of the louvers The five rows of louvers are characterized in that both ends in the longitudinal direction are connected to the cooling fins.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

5 is a plan view showing the structure of the cooling fin used in the tubular heat exchanger according to the present invention, Figure 6 is a cross-sectional view taken along line BB of Figure 5, Figure 7 is a structure of the cooling fin according to another embodiment of the present invention The top view shown.

As shown in FIGS. 5 and 6, the narrow tubular heat exchanger according to the present invention is coupled to the refrigerant pipe 51 through which a refrigerant flows and the refrigerant pipe 51 is expanded to expand the heat exchange area between the refrigerant and the air. It consists of a plurality of cooling fins 53 to secure the, the refrigerant pipe 51 is made of a narrow pipe having a diameter of 6mm or less, each of the cooling fins 53 in the width direction of the cooling fins 53 A total of six rows of louvers 55 are formed to be inclined with respect to the reference plane of the cooling fins 53, and the louvers 55 are portions corresponding to regions between the respective refrigerant pipes 51 of the cooling fins 53. Are each placed on.

Further, the louvers 55A, 55C, 55D, 55F of the first row, the third row, the fourth row, and the sixth row of the louvers 55 have either one of the ends in the width direction. It is formed in the form of a half louver connected to the cooling fins 53, the second row and the fifth row of louvers 55B (55E) of each of the louvers 55, both ends in the longitudinal direction of the cooling fins 53 )

That is, the louvers 55A, 55C, 55D, 55F of the first row, the third row, the fourth row, and the sixth row are connected to one end of the cooling fin 53 in the width direction and the other end of the louvers 55A, 55C, 55D, 55F. It is a half louver shape that is bent upward or downward with respect to the cooling fins 53, and the second and fifth rows of louvers 55B and 55E are cut at both ends in the width direction from the cooling fins 53. Both ends are processed and connected to the cooling fins 53 at both ends in the longitudinal direction.

Here, the louver 55A of the first row is formed to be bent upward of the cooling fins 53, and the louver 55C of the third row is formed to be bent downward of the cooling fins 53.

In addition, the louvers 55D, 55E, 55F of the fourth row, the fifth row, and the sixth row are arranged in the first row, the second row, and the second row based on a line connecting the pipe centers of the refrigerant pipe 51. It is formed symmetrically with three rows of louvers 55A, 55B, 55C.

In addition, the louvers 55A, 55B, 55C of the first row, the second row, and the third row are all formed to be inclined in the same direction, and the louvers 55D of the fourth row, the fifth row, and the sixth row ( All of the 55E) 55F are formed to be inclined in the opposite direction to the louvers 55A, 55B, 55C of the first row, the second row, and the third row.

In addition, a flat section F is formed between the louvers 55C of the third row and the louvers 55D of the fourth row in order to reduce wear of the tool used in the processing of the cooling fins 53.

In addition, each of the louvers 55 has a center of the line connecting the longitudinal end thereof with the same center as the refrigerant pipe 51 around the refrigerant pipe 51 and the diameter is twice the diameter of the refrigerant pipe 51. It forms so that the following virtual circle C may be formed.

In addition, the length from the louvers 55A and 55F of the first row and the sixth row to the end in the width direction of the cooling fin 53, that is, the fin tip length Lt of the cooling fin 53 is the louver 55. In order to ensure the durability of the tool used in the precise formation and processing of the)) is formed so that each 0.5mm or more.

In addition, the louvers 55A, 55C, 55D, 55F of the first row, the third row, the fourth row, and the sixth row have a width Ld1 of the louvers 55B of the second row, the fifth row. 55E is formed to be half of the width Ld2.

Lastly, according to another embodiment shown in FIG. 7, the louver unprocessed portion N may be provided on the louvers 155 of the cooling fin 153 to prevent the twist of the cooling fin 153 due to molding. have.

The tubular heat exchanger according to the present invention constructed and operated as described above reduces the number of louvers formed on the cooling fins so as to be suitable for the tubular tubularization of the refrigerant pipe, and simultaneously changes the shape and angle of the louvers to design the louvers of the cooling fins. By optimizing, manufacturing costs are reduced and miniaturization is possible, as well as air pressure loss is reduced and heat transfer efficiency is improved to maximize heat exchange performance.

Claims (6)

In a heat exchanger consisting of a refrigerant pipe through which a refrigerant flows and a plurality of cooling fins coupled to the refrigerant pipe to secure a heat exchange area between the refrigerant and air, The refrigerant pipe is made of a narrow pipe having a diameter of 6 mm or less, Each of the cooling fins has a total of six rows of louvers inclined with respect to the reference plane of the cooling fins in the width direction of the cooling fins. The louvers of the first row, the third row, the fourth row, and the sixth row of the louvers are formed in the form of a half louver in which one of both ends in the width direction is connected to the cooling fin, The second row and the fifth row of louvers of each of the louver, the tubular heat exchanger, characterized in that both ends in the longitudinal direction is connected to the cooling fins. The method of claim 1, The louvers of the first row, the second row, and the third row are narrow tubular, characterized in that they are formed symmetrically with the louvers of the fourth row, the fifth row, and the sixth row on the basis of the line connecting the pipe centers of the refrigerant pipe. heat transmitter. The method of claim 1, The louvers of the first row, the second row, and the third row are all inclined in the same direction, and the louvers of the fourth row, the fifth row, and the sixth row are all the louvers of the first row, the second row, and the third row. A tubular heat exchanger, characterized in that formed inclined in the opposite direction to the field. The method of claim 1, Each of the louvers has a narrow tubular shape, characterized in that the trajectory of the line connecting the longitudinal end thereof has a same center as the refrigerant pipe around the refrigerant pipe and the diameter thereof is a virtual circle which is less than twice the diameter of the refrigerant pipe. heat transmitter. The method of claim 1, A length from the louvers of the first row and the sixth row to the widthwise end of the cooling fin, that is, the length of the fin tip of the cooling fin is formed to be 0.5 mm or more, respectively. The method of claim 1, And the louvers of the first row, the third row, the fourth row, and the sixth row are formed such that their widths are half the widths of the louvers of the second row and the fifth row.