KR100739196B1 - Fin-tube heat exchanger - Google Patents

Abstract

The present invention relates to a heat exchanger, and comprising a wave fin; A serpentine tube coupled to the curved surface of the wave waveform; It is configured to include, by maximizing the contact area between the tube and the fin, thereby providing a heat exchanger that greatly improved the heat transfer through the fin.

Heat exchanger, corrugated fin, condenser, evaporator, heat transfer efficiency

Description

Fin-Tube Heat Exchanger {FIN-TUBE HEAT EXCHANGER}

1 is a perspective view showing a general shape of a refrigerator cabinet

Figure 2 is a side view showing the configuration of the direct-cooling refrigerator of Figure 1

Figure 3 is a schematic diagram showing the configuration of the refrigeration cycle of the direct-cooling refrigerator of Figure 2

Figure 4 is a perspective view showing the configuration of the condenser of the direct-cooling refrigerator of Figure 1

Figure 5 is a side view of Figure 4

6 to 8 relate to the configuration of a heat exchanger according to an embodiment of the present invention,

6 is a perspective view of the configuration of a heat exchanger according to an embodiment of the present invention;

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6

Figure 8 is a front view of Figure 6

*** Explanation of symbols for the main parts of the drawing ***

9: refrigerator cabinet 2: door

10: refrigerator compartment 20: freezer compartment

30: compressor 40: condenser

41: condenser tube 42: fin

50: first evaporator 60: second evaporator

70: accumulator 80: valve

81: first tube 82: second tube

88: refrigerant flow direction 99: refrigerant piping

100: heat exchanger 101: fluid tube

102: upper pin 103: lower pin

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin tube heat exchanger, and more particularly, to a fin tube heat exchanger applied to a condenser, an evaporator, or the like of a direct-cooling refrigerator having improved heat exchange efficiency with ambient air.

In general, a direct-cooling refrigerator refers to a method in which an evaporator is formed in close contact with a refrigerating compartment or a freezing compartment or directly forms a mounting plate of the refrigerating compartment or a freezing compartment as an evaporator, thereby directly cooling the refrigerating compartment or the freezing compartment. Recently, an indirect cold type refrigerator which injects cold air into the refrigerating compartment and the freezing compartment is widely used. However, the direct-cooling refrigerator generates a large amount of cold air separately, but instead directly generates the cold air of the evaporator by the natural convection of the cooled air around the evaporator. Or by the principle of supply to the freezer.

Such a direct-cooling refrigerator 9 has a refrigeration cycle in which two evaporators 50 and 60 are connected in series, as shown in Figs. That is, the direct-cooling refrigerator 9 includes a refrigerator cabinet 1 having a refrigerating compartment 10 and a freezing compartment 20, a compressor 30 that compresses a refrigerant of a refrigerating cycle and is formed at the bottom of the cabinet 1, and a refrigerant passage. A condenser 40 for condensing the refrigerant while dissipating heat while being supplied with a refrigerant compressed in the direction indicated by reference numeral 88 along the direction 99 and a refrigerating chamber while being supplied with a refrigerant from the condenser 40 to take away the surrounding heat. The first evaporator 50 formed in close contact with the rear side of the refrigerating compartment 10 and the freezer compartment 20 formed in close contact with the freezer compartment 20 to cool the evaporation of the refrigerant from the first evaporator 50 to the freezer compartment 20. The second evaporator 60 connected in series with the first evaporator 50 to cool, the first tube 81 or the condenser 40 and the second evaporator connecting the condenser 40 and the first evaporator 50. And a valve 80 for selectively opening any one of the second tubes 82 connecting the 60.

At this time, the condenser 40 exchanges heat generated by condensation of the refrigerant with the surrounding air, and the evaporators 50 and 60 need to effectively absorb heat from the surroundings as the refrigerant evaporates.

To this end, as shown for example with the condenser 40 in FIGS. 4 and 5, the condenser 40 has a plurality of fins 42 which assist heat exchange around the tube 41 through which the refrigerant flows. ) Is bonded around. However, since the plurality of fins 42 for assisting heat exchange are blazed coupled with the tube 41 in point contact 42a, heat is transferred from the tubes 41 to the fins 42, so that the fins 42 ) Had limited heat exchange with the surrounding air.

The present invention has been made to solve the problems of the prior art as described above, and an object thereof is to provide a heat exchanger having an improved heat exchange performance with ambient air.

Another object of the present invention is to improve the freezing and noise performance of the direct-cooling refrigerator by applying such a heat exchanger to the condenser or evaporator of the direct-cooling refrigerator.

The present invention, in order to achieve the object as described above, and the wave fin; A serpentine tube coupled to the curved surface of the wave waveform; It provides a heat exchanger characterized in that it comprises a.

This is because the fins that assist in the heat exchange between the surrounding air and the fluid passing through the tube are formed in a wavy wave, and the tube is combined with the curved surface of the wavy wave so that the line contact or the surface contact is not point contact, so that the fin and the tube are in contact with each other. Since the heat transfer area is increased, the heat conduction characteristics are improved, and therefore, the heat exchange performance between the tube and the surrounding air is greatly improved.

At this time, the tube is coupled to the high point region 102c and / or the low point region 103c of the wave waveform of the fin. Through this, it is possible to maximize the contact area between the fin and the tube.

The wave fins are coupled to the upper and lower surfaces of the tube, respectively, and the heat of the fluid of the tube is exchanged with the surrounding air through the corrugated fins respectively coupled to the upper and lower surfaces. At this time, the pin is coupled to the upper surface of the tube and the pin is coupled to the lower surface of the tube is located on a plane that is not the same. This allows the air around the heat exchanger to exchange heat with fins of wider cross-sectional area.

For example, when the heat exchanger acts as a condenser and hot refrigerant flows in the tube and the surrounding air is low compared to the temperature of the heat exchanger, the fins are alternately arranged in planes that are not equal to each other with respect to the tube, Fins are more likely to come into contact with cold air that is not warmed by adjacent fins. That is, in the state where the heat exchanger is horizontally placed and there is no flow of ambient air, the air heated by heat exchange with each fin is naturally convection upward without heat exchange with the adjacent fin. Thus, the fins staggered with each other can maximize the cooling effect by contacting the surrounding cold air.

Fins having a curved surface coupled to the upper surface of the tube, and pins having a curved surface coupled to the lower surface of the tube are regularly spaced therebetween, thereby improving mass production applicability.

The inner curvature of the fin of the wavy wave is formed equal to the outer curvature of the tube. Therefore, since the fin can be formed to surround the tube, it is possible to secure a wider contact area between the tube and the fin.

And, both ends of the pin is coupled to the tube as if it surrounds the tube. This not only improves the heat transfer efficiency between the tube and the fins at both ends, but also strengthens the bond strength between the fin and the tube.

On the other hand, the present invention provides a direct-cooling refrigerator characterized in that the heat exchanger is applied to a condenser or an evaporator.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The following examples are provided to aid the understanding of the present invention and should not be construed as limiting the scope of the present invention, and those skilled in the art may make various modifications and improvements within the scope of the technical idea of the present invention described in the claims.

6 to 8 relate to the configuration of a heat exchanger according to an embodiment of the present invention, Figure 6 is a perspective view of the configuration of a heat exchanger according to an embodiment of the present invention, Figure 7 is a cut line VII- 8 is a front view of FIG. 6.

As shown in the figure, the heat exchanger 100 applicable to the condenser or the evaporator of the direct-cooling refrigerator according to an embodiment of the present invention is formed in a twisted tube 101, the fluid flowing therein, and formed in a wave wave And the pins 102 and 103 coupled to each other so as to surround the apex portions 102c and 103c on the upper and lower surfaces of the tube.

Herein, the curvature R1 of the inner surfaces of the fins 102 and 103 is formed to be the same as the outer curvature of the tube 101 so that the fins 102 and 103 surround the tube 101 to form the fins 102 and 103. And the contact areas 102a and 103a between the tube 101 are maximized.

In addition, the upper pin 102 coupled to the upper side of the tube 101 and the lower pin 103 coupled to the lower side of the tube 101 are the same at regular intervals d, as shown in FIG. 8. Staggered in a plane that is not. Therefore, when the heat exchanger 100 is placed horizontally and there is no flow of ambient air, the air heat-exchanged with the fins 102 and 103 of the heat exchanger 100 does not heat-exchange with the adjacent fins 102 and 103 and is indicated by reference numeral 199. As it rises in the direction indicated by, the fins 102 and 103 of the heat exchanger 100 have more opportunities to exchange heat with the surrounding cold air, respectively.

In addition, both ends 102b and 103b of the fins 102 and 103 are combined as if they surround the tube 101, thereby increasing heat transfer between the fins 102 and 103 and the tube 101, as well as the fins 102 and 103 and the tube. Bonding force between 101 is also increased.

The heat exchanger 100 configured as described above may be utilized for various purposes, but is particularly advantageous when applied to the condenser of the direct-cooling refrigerator. This is because the direct-cooling refrigerator is embedded in the heat insulating part of the refrigerator cabinet, so that a separate blower fan is not attached. Because you have to secure. If the tube of the condenser 40 of the direct-cooling refrigerator is long, the amount of refrigerant filling to fill the refrigerant pipe of the condenser 40 is not only increased unnecessarily, but when the operation of the compressor in operation is stopped, it is introduced into the evaporator by the internal pressure difference. The amount of the high-temperature refrigerant is increased, causing noise to increase at the exit of the evaporator, and the time to increase the pressure of the condenser 40 at the start of the compressor to the extent necessary for condensation becomes long, so the efficiency of the refrigerating cycle is increased. This causes a problem that causes the deteriorating problem.

Therefore, by applying the heat exchanger 100 according to an embodiment of the present invention to the condenser 30 of the direct-cooling refrigerator, since the heat dissipation efficiency is improved, the pipe length of the condenser can be reduced, so that the amount of refrigerant filling required for the refrigeration cycle is increased. It can reduce the amount of noise generated from the high-temperature refrigerant flowing into the evaporator while the compressor is stopped, and reduce the time to reach the condensation pressure required for the condenser action. Will have

In addition, even when the heat exchanger 100 is applied to the evaporator, the heat transfer efficiency of the evaporator is improved, thereby effectively cooling the refrigerating compartment or the freezing compartment.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

As described above, according to the present invention, there is provided a wave fin; A serpentine tube coupled to the curved surface of the wave waveform; It is configured to include, by maximizing the contact area between the tube and the fin, the heat transfer area between the fin and the tube is significantly increased compared to the conventional to provide a heat exchanger with an improved heat transfer efficiency.

And, the present invention, the fin of the wave waveform is coupled to the upper surface and the lower surface of the tube, respectively, and the curved surface is coupled to the upper surface of the tube and the curved surface is coupled to the lower surface of the tube Fins are arranged on non-identical planes to provide a heat exchanger that can minimize the degradation of heat transfer performance by surrounding fins.

In addition, the present invention is coupled to the tube as both ends of the fin surrounding the tube, thereby improving the heat transfer performance between the tube and the fin at both ends, heat exchanger that also increases the bond strength between the fin and the tube to provide.

In addition, the present invention by applying a heat exchanger having improved heat exchange efficiency to the condenser or evaporator of the direct-cooling refrigerator, it is possible to reduce the pipe length of the condenser or evaporator as the heat radiation efficiency is improved, thereby reducing the amount of refrigerant filling required for the refrigeration cycle, Noise generated from the high-temperature refrigerant flowing into the evaporator during the operation stop of the compressor can also be reduced, and time to reach the condensation pressure required for the condenser action of the condenser can be quietly operated quickly.

Claims (8)

It is formed at least bent at least once, the tube through which the refrigerant flows; And And a wave fin coupled to the top and bottom surfaces of the tube to assist heat exchange between the tube and ambient air. The method of claim 1, The wavy pin includes an upper pin coupled to an upper surface of the tube and a lower pin coupled to a lower surface of the tube, The upper fin and the lower fin is a heat exchanger, characterized in that the curved surface is coupled with the tube, respectively. The method of claim 2, The upper fin is a heat exchanger, characterized in that arranged alternately with the lower fin. The method of claim 2, The upper fin and the lower fin, the heat exchanger, characterized in that arranged at a predetermined interval, respectively. The method according to any one of claims 1 to 4, And the tube is coupled to a high point region and / or a low point region of the wave waveform of the fin. The method of claim 5, And the inner curvature of the fin of the wavy wave is equal to the outer curvature of the tube. The method according to any one of claims 1 to 4, Both ends of the fin is coupled to the tube as if surrounding the tube. A direct-cooling refrigerator, wherein the heat exchanger according to any one of claims 1 to 4 is applied to a condenser or an evaporator.

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