KR870001630Y1 - Evaporator for refrigerator - Google Patents

Abstract

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Description

Evaporator for Refrigerator

1 is a partial perspective view of an evaporator for a refrigerator according to the present invention.

2 is a front view and a side view of the same part.

3 is a cross-sectional view of a heating tube used in the present invention.

4 is a partial front view showing an example of a conventional evaporator.

5 is a cross-sectional view of FIG.

6 is a partial front view showing another conventional example.

FIG. 7 is a cross-sectional view of the spiral of FIG.

8 is a partial front view showing another conventional example.

9 is a side view of the pin used in the example of FIG.

* Explanation of symbols for main parts of the drawings

1: refrigerant tube 2: heating tube

3: Refrigerant pipe insert color ball 4: Bending piece

5: Soviet pin 6: Duct

The present invention relates to an evaporator for a refrigerator, and more particularly to an improvement of a refrigerator evaporator in which a defroster is installed.

In general, the evaporator of a refrigerator or a freezer has a surface temperature of 0 ° C. or lower, and when it is used, frost is generated on the surface thereof. Therefore, by installing a reheater such as a heating tube with an electric heater, the frost is removed from the surface. It is necessary to prevent a decrease in the amount of air flow and a decrease in cooling capacity.

Conventionally, various evaporators have been devised to achieve this purpose, but these have many problems as follows.

That is, as shown in Figs. 4 and 5, the U-shaped insertion grooves 13 and 14 for inserting the refrigerant pipe 11 and the heater tube 12 in which the heater 12 'is incorporated are alternated. There was a long flat fin 15 formed in the duct 16, but this is a punching operation for forming the insertion groove 13 in order to fit the large diameter refrigerant pipe 11 The loss of the starting material is large, the heat transfer area is not only reduced, and because the contact area between the refrigerant pipe 11 and the fin 15 is small, the contact heat resistance is increased, resulting in a decrease in heat transfer function.

In addition, as shown in Figs. 6 and 7, the elongated flat plate on which the insertion hole 23 for inserting the refrigerant pipe 21 and the U-shaped insertion groove 24 for inserting the heater tube 22 is formed. Although there was one consisting of a fin 25, this requires a refrigerant pipe inserting collar 27 and a hairpin tube 28 are separately required and welded, which complicates the manufacturing process and increases the flow resistance of the refrigerant in the weld. There was a problem such as refrigerant leakage due to welding of welding work and corrosion of welding part.

Moreover, in these conventional evaporators, since the main part of the fin continues from the air inlet to the outlet of the ducts 16 and 26, the representative heat transfer length is increased, so that the temperature boundary layer is formed thick at the airflow outlet, so that the average heat transfer rate is greatly reduced. have.

In order to eliminate these shortcomings and problems, an evaporator such as Patent Publication No. 84-788 has been devised by Hitachi Co., Ltd. of Japan, and as shown in FIGS. 8 and 9, a refrigerant tube ( 31 and the refrigerant pipe 31 using a plurality of small pins 35 formed with a pair of insertion collar holes 33 for inserting the pipes 31 and clamping portions 34 in contact with the heating tube 32 at the corners thereof. By supporting the heating tube 32, the spacing of the fins 35 is increased in places where there is a lot of ideas according to the amount of implantation on the airflow inlet and outlet sides of the duct 36, thereby preventing an increase in supply resistance due to the idea. In this case, the spacing of the fins 35 is increased to increase the heat transfer area. However, since the contact area between the heating tube 32 and the fins 35 for defrosting is small, the amount of heat transfer is small, so that efficient defrosting ability can be exhibited. There was no closure.

The present invention has been devised to solve such a conventional closure and problems described in detail according to the accompanying drawings as follows.

That is, the present invention, as shown in Figures 1 to 3, the small collar pin (3) is formed in the insertion collar hole (3) through which the refrigerant pipe (1) is inserted and the heating tube (2) is sandwiched in the corner ( 5) In a common one in which the gap is varied in proportion to the amount of implantation on the airflow inlet side and the outlet side in the duct 6, the both side surfaces 7 and 8 of the heating tube 2 are planar, In the corner of (5), the flat bending piece 4 was formed.

The present invention thus constructed supports the refrigerant pipe 1 and the heating tube 2 by using a plurality of small piece pins 5, so that the airflow inlet side and the outflow side of the duct 6, as in the Hitachi patent described above, are conceived. Where the amount is large, the spacing resistance of the airflow is reduced by increasing the spacing of the fins 5, and the conventional evaporator shown in FIGS. 4 to 7 by increasing the heat transfer area by decreasing the spacing of the fins 5 in small places. The fins are continuously integrated from the inflow side to the outflow side of the airflow in the duct, and the temperature boundary layer at the outflow side becomes thicker with the increase in the representative heat transfer, thereby preventing the average heat transfer rate from deteriorating. As in the conventional evaporator shown in FIGS. 6 and 7, the welding work between the coolant tube inserting collar 27 and the heat sink fin tube 28 is not required, thereby simplifying the manufacturing process and reducing the cost. of Refrigerant flow resistance and refrigerant leakage due to corrosion can be prevented.

In addition, unlike the Hitachi patent, the plate-shaped bent piece 4 is formed on the four corners of the fin 5, and the two axial surfaces 7 and 8 of the heating tube 2 are brought into flat contact with each other to form a heating tube ( The heat transfer area between 2) and fin (5) is greatly increased to exhibit a quick and uniform defrosting ability.

In addition, since the heating tube 2 and the fin 5 are planarly contacted by both side surfaces 7 and 8 and the bent piece 4, no deformation occurs between the fin 5 and the heating tube 2, so that the heating tube 2 and the fin 5 are always in a constant state. It is maintained.

As described above, according to the present invention, by using a plurality of small piece pins, the gap between the fins at the inlet and outlet sides of the duct prevents an increase in ventilation resistance due to frosting, and at the same time, increases the contact area between the heating tube and the fins, thereby transferring heat. By increasing the effect is to make a quick and uniform defrost.

Claims (1)

Insertion collar hole (3) into which the refrigerant pipe (1) is inserted is formed, and the small piece pin (5) in which the heating tube (2) is sandwiched in the corner is implanted in the duct (6). In the ordinary thing to be different in proportion to the above, both side surfaces 7 and 8 of the heating tube 2 are planar, and the flat edges of the fins 5 are formed on the four corners. Evaporator for refrigerator characterized in that.