KR20000066528A - Air-cooled heat exchanger for condenser in refrigerator and water cooler - Google Patents

Abstract

PURPOSE: A heat exchanger is provided to reduce cost and volume of heat exchanger by improving heat exchange performance of a compressor. CONSTITUTION: A heat exchanger wherein a refrigerant flows along a pipe(3), a fin(4) for extending thermal exchange area is arranged outside the pipe, and heat dissipation is performed by an air flow, a rod(6) is inserted into the pipe where a refrigerant flows, so as to thereby reduce sectional area within the pipe where the refrigerant flows. The fin is made up of an aluminum alloy sheet. Thus, a pipe having a large diameter is used for an air cooled heat exchanger for a condenser in a small sized refrigerator or hot/cold water purifier.

Description

AIR-COOLED HEAT EXCHANGER FOR CONDENSER IN REFRIGERATOR AND WATER COOLER}

The present invention can increase the diameter of the pipe through which the refrigerant flows by inserting a rod or a grooved rod into the inside of the pipe to reduce the cross-sectional area of the pipe through which the refrigerant flows in the air-cooled heat exchanger. In particular, in the case of small refrigerators or small cold and hot water purifiers with a small refrigerant flow rate, large pipes can be used.

The conventional air-cooled heat exchanger used in general air conditioners, refrigerators, and cold and hot water purifiers is made by inserting a circular copper pipe into a perforated aluminum alloy sheet (corresponding to the pin 4), and then applying mechanical force or hydraulic pressure. By expanding the pipe 3 by means of the pipe 3, the pipe 3 is brought into close contact with the fin 4 so as to maintain its strength and to facilitate heat transfer from the pipe 3 to the fin 4. Figure 2 shows a heat exchanger of this type, where reference numeral 5 shows the tight contact between the fin 4 and the pipe 3. However, the method of making this type of air-cooled heat exchanger has a small diameter to be applied to a pipe having a small inner diameter (approximately 5 mm or less in diameter), which is difficult to expand by mechanical force, and requires considerable high pressure even in the case of expansion by hydraulic pressure. Application of the method was difficult.

In addition, a small diameter steel pipe having a diameter of less than 5 mm cannot be used in a small refrigerator or a small air-cooled heat exchanger used for a small cold / hot water purifier. Was used. Therefore, there is a limitation in applying the conventional air-cooled heat exchanger described above to the air-cooled heat exchanger for a condenser of a small refrigerator or a small cold and hot water purifier. That is, in a small refrigerator or a small cold / hot water purifier, since a flow rate of the refrigerant is small, a small diameter pipe is required to maintain a constant speed of the refrigerant, which makes it difficult to use the conventional air-cooled heat exchanger described above. Therefore, the small refrigerator uses a steel pipe (1) that is less thermally conductive and difficult to expand than copper or aluminum, but has a relatively low cost. Also, in order to increase the heat exchange area, air flows by welding a steel bar (2) corresponding to a fin to increase the heat exchange area. By the heat dissipation was good. These heat exchangers were generally mounted on the rear of small refrigerators or small cold and hot water purifiers so that heat was released by natural convection.

However, the heat exchanger conventionally used in a small refrigerator or a small cold / hot water purifier requires not only a small area of the steel pipe 1 in contact with air and a large number of steel bars 2 mounted in the small area, but also a small area in contact with air. Several S-shaped arrangements of the type shown in the figure were needed, resulting in an increase in the overall volume of the heat exchanger. Therefore, not only the refrigerator or the cold / hot water purifier can be further miniaturized, but the heat exchange efficiency is low, and the cost increases or the space for mounting the heat exchanger inside the refrigerator or the cold / hot water purifier increases.

In addition, in a small refrigerator or a small cold / hot water purifier, an inexpensive steel pipe (1) having poor thermal conductivity is used as a pipe through which a refrigerant flows. In general, a pipe connected to a condenser is mainly made of copper, so that steel and copper are used. Solder between dissimilar metals was very long, and there were many defects.

The present invention is to solve the above problems by inserting a pin (4) of aluminum alloy sheet in a copper pipe (3) of the round and then pipe and fin (fin) by expanding the pipe (3) by mechanical force or hydraulic pressure (fin) It is an object of the present invention to provide a means by which a heat exchanger having a relatively large diameter of the pipe 3 can be used as a small refrigerator having a small refrigerant flow rate or an air-cooled heat exchanger for a small cold / hot water purifier.

In addition, the present invention can provide a small volume air-cooled heat exchanger by increasing the heat exchange performance of the condenser of the general refrigerator or cold / hot water purifier.

1 is a schematic diagram of an air-cooled heat exchanger for a condenser of a conventional small refrigerator and a small cold / hot water purifier

2 is a schematic diagram of a conventional heat exchanger used in an air conditioner, a general refrigerator, or a cold / hot water purifier.

Figure 3 is a schematic diagram showing an embodiment of the present invention

(A) of FIG. 4 is an enlarged view of portion A of FIG.

(B) of FIG. 4 is a cross-sectional view of the portion A pipe of FIG.

Explanation of symbols on the main parts of the drawings

3: pipe

4: fin of aluminum alloy sheet

6: rod

7: Refrigerant passage

The present invention relates to an air-cooled heat exchanger for a condenser, in which a refrigerant to be condensed flows inside a pipe and a fin is formed on the outer surface to increase a heat exchange area so that heat is radiated by air flow. In the heat exchanger, a cross-sectional area through which a refrigerant passes in a pipe by inserting an arbitrary process into a circular or polygonal rod 6 or a circular or polygonal rod 6 into a circular pipe 3 through which a refrigerant flows. By reducing (7), consequently, when the same flow rate flows, the speed of the refrigerant is increased to increase the heat exchange performance.

Hereinafter, an air-cooled heat exchanger for a small refrigerator and a small cold / hot water purifier according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a view showing the configuration of a heat exchanger according to an embodiment of the present invention.

The present invention provides a condenser refrigerant flows inside the pipe and a fin is formed on the outer surface to increase the heat exchange area, so that heat is radiated by air flow. In order to reduce the cross-sectional area (7) through which the refrigerant passes in the pipe by inserting a random machining into the circular or polygonal rod (6) or the circular or polygonal rod (6) in the pipe (3) of the Looking specifically through the embodiment shown in Figure 3, the heat exchanger shown in the embodiment corresponds to the fin 4, the copper tube of less than 10mm in diameter larger than the pipe used in the general small refrigerator or small cold and hot water purifier Insert the pipe (3) into the pin (4) by inserting it into the perforated aluminum alloy sheet and expanding the copper tube by 0.5 to 1 mm by mechanical force or hydraulic pressure. Make a "U" type pipe that maintains strength by close contact, and insert the four-sided rod 6 into the expanded "U" type pipe (3) so that the equivalent diameter (7) of the cross-sectional area where the refrigerant flows is 5 mm or less. The heat exchanger of a generally large pipe, having fins (4) made of aluminum alloy tubes on the outer surface of the pipe, is connected to the expanded pipe by the same diameter "C" type pipe (9). Even when used as a condenser for water purifier, the speed of the refrigerant in the pipe can be maintained more than a certain level.

As a result, a large diameter pipe can be used for the condenser heat exchanger of a small refrigerator or a small cold / hot water purifier, and an aluminum alloy sheet can be used as a fin so that a high efficiency heat exchanger having a large heat transfer area can be mounted in a narrow space. In addition, it is possible to improve the efficiency, and to reduce the volume of refrigerant in the condenser pipe, thereby reducing the possibility of damage to the compressor due to the excessive amount of refrigerant, and reducing the cost.

In addition, when applied to a general refrigerator or cold and hot water purifier with a large flow rate of the refrigerant can increase the heat exchange area to provide a small volume air-cooled heat exchanger.

Further, in the above embodiment, another embodiment in which a spiral groove is formed in the four-sided rod to improve the flow of the refrigerant may be considered.

According to the present invention described above, it is possible to use a heat exchanger using a large diameter pipe in an air-cooled heat exchanger with a small refrigerant flow rate, thereby increasing the air-side heat transfer area, and consequently, reducing the volume of the heat exchanger. It is possible to reduce the cost of the heat exchanger. In addition, it is possible to reduce the amount of refrigerant to reduce the possibility of damage to the compressor due to the excessive amount of refrigerant and to reduce the cost. Moreover, the use of copper condenser pipes makes it easier to solder with copper connecting pipes, reducing work time and reducing the possibility of refrigerant leakage.

Claims (3)

In an air-cooled heat exchanger for a condenser of a refrigerator or a cold / hot water purifier, in which a coolant condensed flows inside a pipe and a fin is formed on the outer surface to increase a heat exchange area, heat is radiated by air flow. Air-cooled heat exchanger for a condenser of a refrigerator or a cold and hot water purifier, characterized in that the rod is inserted to reduce the cross-sectional area flowing. The air-cooled heat exchanger for a condenser of a refrigerator or a cold / hot water purifier according to claim 1, wherein a cross section of the rod inserted into the pipe is circular or polygonal. The air-cooled heat exchanger according to claim 1 or 2, wherein any groove is formed into a rod whose cross section is circular or polygonal.