JPH1114191A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger used for refrigerating and freezing which is high in its cooling capacity and excellent in its frosting resistance. SOLUTION: A heat exchanger comprises a plurality of rows of heat transfer pipes 12a and 12b in which a refrigerant flows and a plurality of rectangular fins 13 which are fitted to the heat transfer pipes 12a and 12b and between which air 15 flows. Each fin 13 has a front edge inclined relative to the flowing direction of the air 15 and the heat transfer pipes 12a and 12b are arranged in the vicinity of the diagonal lines of the fins 13. Thus, a heat exchanger capable of maintaining high cooling capacity can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin tube type heat exchanger used for a refrigerator or a freezer.

[0002]

2. Description of the Related Art In recent years, refrigerators have been increased in size, and in order to cool and maintain the temperature in the refrigerator, a greater cooling capacity is required for the heat exchanger. However, when air is cooled to a temperature below the freezing point as in a refrigerator-freezer, a frosting phenomenon occurs in the heat exchanger, and the frost blocks the air passage and extremely reduces the cooling capacity. For this reason, there is a demand for a heat exchanger capable of securing an air passage even if frost is formed and maintaining a cooling capacity for a long time.

[0003] Referring to the accompanying drawings,
A conventional heat exchanger disclosed in Japanese Patent No. 428 will be described.

FIG. 3 is a perspective view of a conventional heat exchanger, FIG. 4 is a cross-sectional view of a main part of a side surface, and FIG. 5 is a cross-sectional view of FIG.

In FIGS. 3, 4 and 5, 1 is a heat exchanger, 2 is a heat transfer tube, 3 is a fin, 4 is frost, 5 is a flow direction of air, and 6 is a refrigerant. The heat exchanger 1 is composed of a plurality of rows of heat transfer tubes 2 arranged in a grid pattern in which a coolant 6 flows, and a plurality of rectangular fins 3 inserted into the heat transfer tubes 2 and through which air 5 flows. The fins 3 are arranged such that the leading edge of the fins 3 is perpendicular to the flow direction of the air 5 and is divided for each row.

[0006] The conventional heat exchanger 1 configured as described above.
Will be described. The air 5 that has flowed in by the driving of the fan (not shown) exchanges heat through the refrigerant 6 flowing inside the heat transfer tube 2, the heat transfer tube 2, and the fins 3. When the evaporation temperature of the refrigerant 6 becomes 0 ° C. or lower, the water vapor in the air 5 adheres as frost 4 and forms a frost layer. Then, since the cooling capacity is remarkably reduced due to the reduction of the passing air volume and the heat insulation effect due to the frost 4, defrosting is necessary. Therefore, the fins 3 are divided for each row, and the optimal fin pitch is set for each row, thereby suppressing a decrease in the amount of passing air and a decrease in the cooling capacity.

[0007]

However, since the conventional heat exchanger 1 is configured as described above, most of the frost 4 is frosted on the entire front edge of the fin 3 and the fin pitch is reduced. There was a problem that it was not possible to secure a sufficient amount of passing air and maintain the cooling capacity only by setting.

The present invention has been made in view of the above problems, and provides a heat exchanger capable of maintaining a cooling capacity even when frost is formed.

[0009]

In order to solve the above-mentioned problems, a heat exchanger according to the present invention includes a plurality of rows of heat transfer tubes through which a refrigerant flows, and a plurality of heat transfer tubes inserted into the heat transfer tubes and through which air flows. The heat transfer tubes are disposed substantially diagonally to the fins, and the fins are disposed such that the front edge of the fins is oblique to the flow of air. .

[0010] In order to solve the above-mentioned problems, the heat exchanger of the present invention includes a plurality of rows of heat transfer tubes through which a refrigerant flows,
It consists of a plurality of rectangular fins that are inserted into the heat transfer tube and through which air flows, and the fins are arranged so that the front edge of the fin is oblique to the flow of air, and the heat transfer tube is The fins are arranged such that the spaces at both ends in the direction perpendicular to the air flow direction are wider than the spaces at the opposite ends.

According to the present invention, even when frost is formed, the amount of passing air can be ensured, and the cooling capacity can be maintained for a long time.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a plurality of rows of heat transfer tubes through which a refrigerant flows, and a plurality of rectangular fins inserted into the heat transfer tubes and through which air flows. A heat exchanger, wherein the heat transfer tubes are disposed substantially diagonally to the fins, and the fins are disposed such that the front edge of the fins is oblique to the flow of air. The distribution of frost on the fins in the step direction can be made non-uniform, and the distance between the heat transfer tubes can be increased. It has the effect of suppressing a decrease in air volume.

According to a second aspect of the present invention, there are provided a plurality of rows of heat transfer tubes through which a refrigerant flows, and a plurality of rectangular fins inserted into the heat transfer tubes and flowing air therebetween. With respect to the flow of the fin, the front edge of the fin is arranged so as to be oblique, and the heat transfer tube is wider at both end spaces on the side perpendicular to the air flow direction of the fin than at the opposite end space. The heat exchanger is characterized by being arranged so that the distribution of frost on the fins in the stepwise direction can be made non-uniform, and the distance between the end of the fins and the heat transfer tube can be increased. Therefore, the air passage at the time of frost formation can be secured, and the reduction of the passing air volume is suppressed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a cross-sectional view of a main part of a side surface of a heat exchanger according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view taken along the line BB of FIG. .

1 and 2, reference numeral 11 denotes a heat exchanger, 1
2a and 12b are heat transfer tubes, 13 is a fin, 14 is frost, 15
Is a flow direction of air, and 16 is a refrigerant. The heat exchanger 11 includes a plurality of rows of heat transfer tubes 12a and 12a through which a refrigerant 16 flows.
b and the heat transfer tubes 12a and 12b, and the air 1
The fins 13 are arranged such that the leading edge of the fins 13 is oblique to the flow direction of the air 15 and is divided for each row.
The heat transfer tube 12a is disposed near the diagonal of the fin 13 so that the distance from the front edge of the fin 13 is short, and the heat transfer tube 12b is long in the distance from the front edge of the fin 13.

Embodiment 1 of the present invention configured as described above
The operation of the heat exchanger 11 will be described.

The air 15 that has flowed in by the drive of the fan (not shown) exchanges heat through the refrigerant 16 flowing inside the heat transfer tubes 12a and 12b, the heat transfer tubes 12a and 12b, and the fins 13. And the evaporation temperature of the refrigerant 16 is 0
When the temperature falls below ℃, the water vapor in the air 15 adheres as frost 14 to form a frost layer.

At this time, since the fins 13 are arranged obliquely to the flow of the air 15, the fins 1 in contact with the air 15
3 can be thinned and the thickness of the frost 14 adhered can be reduced, and the heat transfer tubes 12a and 12b can be
Since the distance between the heat transfer tube 12a and the heat transfer tube 12b can be increased by arranging the heat transfer tube near the diagonal line, it is possible to suppress a sharp decrease in the amount of air passing through even if frost is formed, and to maintain the cooling capacity. Can be.

(Embodiment 2) FIG. 1 is a cross-sectional view of a main part of a side surface of a heat exchanger according to Embodiment 2 of the present invention, and FIG. 2 is a BB cross-sectional view of the embodiment when frost is formed.

1 and 2, reference numeral 11 denotes a heat exchanger, 1
2a and 12b are heat transfer tubes, 13 is a fin, 14 is frost, 15
Is a flow direction of air, and 16 is a refrigerant. The heat exchanger 11 includes a plurality of rows of heat transfer tubes 12a and 12a through which a refrigerant 16 flows.
b and the heat transfer tubes 12a and 12b.
5 comprises a plurality of flowing rectangular fins 13, and the fins 13 are divided and arranged for each row. Also,
The fins 13 are arranged so that the front edge of the fins 13 is oblique to the flow of the air 15 and the heat transfer tubes 12a, 1
The space of the ends 17a, 17b of the fin 13 on the side perpendicular to the flow direction of the air 15 of the fin 13 is wider than the spaces on the opposite ends.

Embodiment 2 of the present invention configured as described above
The operation of the heat exchanger 11 will be described.

The air 15 that has flowed in by the drive of the fan (not shown) exchanges heat through the refrigerant 16 flowing inside the heat transfer tubes 12a and 12b, the heat transfer tubes 12a and 12b, and the fins 13. And the evaporation temperature of the refrigerant 16 is 0
When the temperature falls below ℃, the water vapor in the air 15 adheres as frost 14 to form a frost layer.

At this time, since the fins 13 are arranged obliquely to the flow of the air 15, the fins 1 contacting the air 15
3 can be thinned and the thickness of the frost 14 adhered can be reduced, and the heat transfer tubes 12a and 12b can be
Are arranged separately on the front edge side and the rear edge side, so that the distance between the heat transfer tubes 12a and the heat transfer tubes 12b can be widened and the fins 13 on the side perpendicular to the flow direction of the air 15 can be provided. Since the end portions 17a and 17b can be widened, an air path can be secured even if frost is formed, so that a sharp decrease in the amount of passing air can be suppressed, and the cooling capacity can be maintained.

[0025]

As described above, according to the heat exchanger of the present invention, a plurality of rows of heat transfer tubes through which a refrigerant flows, and a plurality of rectangular fins inserted into the heat transfer tubes and through which air flows. A heat exchanger, wherein the heat transfer tubes are disposed substantially diagonally to the fins, and the fins are disposed such that the front edge of the fins is oblique to the flow of air. Therefore, an air path can be secured even if frost is formed, so that an abrupt decrease in the passing air volume can be suppressed, and an effect that the cooling capacity can be maintained can be obtained.

The heat exchanger of the present invention comprises a plurality of rows of heat transfer tubes through which a refrigerant flows, and a plurality of rectangular fins inserted into the heat transfer tubes and through which air flows. The fins are arranged so that the front edge of the fins is oblique to the air flow, and the heat transfer tubes are arranged such that both end spaces on the side perpendicular to the air flow direction of the fins are opposite end space on the opposite side. Since it is a heat exchanger characterized by being arranged so as to be widened, the frost layer thickness can be reduced, the ventilation resistance near the heat transfer tube can be reduced, and furthermore, the fin both ends side By securing the air path, the air volume can be secured, and an effect that a rapid decrease in cooling capacity can be prevented can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a side surface of a heat exchanger according to Embodiments 1 and 2 of the present invention.

FIG. 2 is a sectional view taken along the line BB of FIG. 1 when frost is formed.

FIG. 3 is a perspective view of a conventional heat exchanger.

FIG. 4 is a sectional view of a main part of a side surface of a conventional heat exchanger.

FIG. 5 is a sectional view taken along the line AA of FIG. 4 at the time of frost formation;

[Description of Signs] 11 Heat exchangers 12a, 12b Heat transfer tubes 13 Fins 15 Air 16 Refrigerant

Claims (2)

[Claims] 1. A plurality of rows of heat transfer tubes through which a refrigerant flows,
The heat transfer tube includes a plurality of rectangular fins that are inserted into the heat transfer tube and through which air flows, and the heat transfer tube is disposed substantially diagonally to the fin. A heat exchanger characterized in that the edges are arranged obliquely. 2. A plurality of rows of heat transfer tubes through which a refrigerant flows,
It consists of a plurality of rectangular fins that are inserted into the heat transfer tube and through which air flows, and the fins are arranged so that the front edge of the fin is oblique to the flow of air, and the heat transfer tube is A heat exchanger, wherein both end spaces on a side perpendicular to the air flow direction of the fins are arranged to be wider than both end spaces on opposite sides.