KR960002571B1 - Refrigerating apparatus - Google Patents

Abstract

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Description

Chiller

1 is a plan view of an evaporator section of a chiller according to one embodiment of the present invention.

2 is a front view of a conventional evaporator portion.

3 is a side view of a conventional evaporator section.

4 is a configuration diagram of a heat pipe portion showing a main portion of the present invention.

5 is a diagram illustrating thermal movement during normal defrosting in the present invention.

6 is an explanatory diagram of heat transfer during defrosting when frost adheres in this invention.

FIG. 7 is an explanatory diagram showing the operation of the heat pipe during defrosting of FIG. 6; FIG.

8 is a perspective view showing a conventional defrosting method.

9 is an explanatory diagram showing an example of installation of a conventional cooling apparatus.

10 is a refrigeration cycle diagram showing a conventional defrosting system.

FIG. 11 is a characteristic diagram showing pressure change during defrosting by the defrosting method in FIG.

* Explanation of symbols for main parts of the drawings

30: evaporator 31: platefin

32: cooling tube A: heat pipe

37: condenser 38: connection

39: evaporator 51: electric heater

The present invention relates to a defrosting device of a cooling device.

8 and 9 are schematic diagrams showing an evaporator portion of a conventional refrigeration apparatus such as that found in the catalog R-C2567-B (issued in July 1984) of the unit cooler of Mitsubishi Electric Corporation of Japan. In the drawing, 41 is an evaporator composed of a plurality of plate fins 41A, a cooling tube 41B penetrating it, and 42 is a defrost heater provided in a heat exchange state on the plate fins 41A of the evaporator 41. The evaporator 41, the defrost heater 42, and the blower 16 are housed in the case 50 and are installed in the same state as shown in the refrigerator 30.

In this structure, if the cooling operation is continued, frost is formed on the evaporator 41, and a defrost timer (not shown) is operated to flow a current through the defrost heater 42. At this time, the heat generated from the defrost heater 42 is conducted to the plate fin 41A and the cooling tube 41B of the evaporator 4 to defrost.

10 is another defrosting method described in Japanese Patent Application Laid-Open No. 62-196581. In this figure, 1 is a compressor, 2 is a condenser, 3 is an expansion valve, 4 is an evaporator, and 5 is a hot gas discharged from the extruder 1. The bypass pipe (4) is bypassed, and 5A is a solenoid valve provided in the middle of the bypass pipe (5). In such a configuration, when the defrosting timer (not shown) operates due to frost on the evaporator 4 while the cooling operation is continued, the solenoid valve 5A is opened to discharge the hot gas discharged from the compressor 1. Is sucked into the compressor 1 through the bypass pipe 5, the solenoid valve 5A, and the evaporator 4. In this way, the hot gas refrigerant is introduced into the evaporator 4 to melt frost attached to the evaporator 4.

As described above, in the former method, since the defrost heater 42 is exposed to the air, part of the heat is naturally conducted to the air in the refrigerator. As a result, the defrosting time is long and the temperature in the refrigerator is increased to increase the temperature of the object. There was a problem that rises. In addition, even when the conception of the evaporator 41 is biased as a part, the whole is heated and there is a problem that the calorie loss is large.

On the other hand, in the latter method, as shown in FIG. 11, when the low pressure and the high pressure rise together with the defrost time, and the end point is mistaken, there is a fear that the protection device (not shown) will operate.

In addition, since the input of the compressor 1 is a heat source, the defrosting test is required every time the specification of the refrigerator is changed because the air temperature, the length of the pipe, and the amount of refrigerant charge are affected.

The present invention has been invented to solve the above problems, and an object thereof is to provide a refrigerating device capable of evaluating defrost by the evaporator alone and suppressing temperature rise in the refrigerator even during defrosting.

The cooling apparatus of this invention inserts the condensation part of a heat pipe into the plate fin of an evaporator, and installs the heating means which operate at the time of defrosting an evaporator in the evaporation part of a heat pipe. In addition, the evaporator and the heating means of the heat pipe are installed to be located below the evaporator and outward from the bottom of the evaporator.

During the defrosting of the evaporator, the heating means is operated to heat the evaporator of the heat pipe and to evaporate the refrigerant charged in the heat pipe to heat transfer to the condenser of the heat pipe, where it is condensed to heat the plate fin and the cooling tube to defrost.

In addition, since the evaporation part and the heating means of the heat pipe are located outside the lower surface of the evaporator, drains generated during the defrost of the evaporator do not flow down the evaporation part and the heating means of the heat pipe.

An embodiment of this invention is described.

In FIGS. 1 to 3, reference numeral 30 denotes an evaporator, which is constituted by a plate fin 31 and a cooling tube 32, like a conventional evaporator. Therefore, the refrigerant exiting the fastener (not shown) passes through the cooling pipe 32 via the distributor 34 and the dividing pipe 35 in the evaporator inlet pipe 33, and the compressor (not shown) in the evaporator outlet pipe 36. Inhaled).

A is a heat pipe, which is constituted by a separate circuit from the cooling tube 32, and the condenser 37 is disposed at the center of the evaporator 30 and connected to the contact portion 38, that is, the vertical portion.

The connecting method connects several condensation parts 37 to the contact parts 36 as shown in FIG.

The upper portion of the communication pipe 38 is provided with an air chamber 38A as indicated by L in the figure. 39 is an evaporation part, ie, a horizontal part, connected to the contact part 38.

Therefore, the heat pipe (A) is composed of a condensation unit 37, the contact unit 38 and the evaporator 39, the refrigerant 50 is sealed in the evaporator 39 and the electric heater 51 is fixed to the fixed bracket ( 52).

The evaporator and the electric heater 51 are disposed below the evaporator 30 and positioned outside the lower surface of the evaporator 30.

Next, the operation will be described.

When the cooling operation is continued, frost is formed on the evaporator 30, and when the defrost timer (not shown) is operated, electricity flows through the electric heater 51.

When electricity flows through the electric heater 51, the refrigerant 50 encapsulated in the evaporator 39 evaporates and becomes superheated steam and is led to the condensation unit 37 through the contact unit 38. And the periphery of the condensation part 37 is heated.

That is, as shown in FIG. 5, the cooling pipe 32, the plate fin 31, and the frost 53 are heated by heat conduction (arrow part in drawing).

Therefore, since the heating inside the evaporator 30, the amount of heat leaking out of the evaporator 30 is small.

As described above, the evaporator 39 repeats a cycle of evaporating by the electric heater 51 and condensing in the condenser 37, which is a low temperature part, and returning to the evaporator 39 again. In addition, as shown in FIG. 6, when the frost 54 remains in one part, the refrigerant moves due to the temperature difference, so that a lot of refrigerant flows by the low temperature part (concentrates on the condensation part 37A in FIG. 7). ) The heating power is increased and frost melts quickly. Therefore, heating power is effectively used even when frost is formed due to bias.

The detection of the end of the defrosting can be easily determined by the installation of a pressure sensor or a temperature detector (not shown) since the pressure or temperature in the heat pipe A rises rapidly when the frost disappears. As shown in FIG. 4, the air inlet 38A is provided to remove the non-condensable gas because the condensation in the condensation unit 37 is interrupted when the non-condensable gas is mixed.

In the case of this cooling device, the evaporator 30 which consists of the plate fin 31 and the cooling pipe 31 inserts the condensation part 37 of the heat pipe A into the plate fin 31 of the evaporator 30, Since the electric heater operated in the defrost of the evaporator 30 of the heat pipe (A) is installed, when the electric heater 51 is energized, the refrigerant 50 encapsulated in the evaporator 39 is evaporated. It becomes superheated steam, and this superheated steam is led to the condensation unit 37 through the contact portion 38 of the heat pipe A to heat the surroundings, and the cooling tube 32, the plate fin 31, and the frost ( By heating 53, the defrost control can be performed by the evaporator 30 alone as the refrigerant circuit, so that it can be freely combined with an outdoor unit (a unit composed of a compressor and a condenser).

As described above, according to the present invention, since the condensation part of the heat pipe is inserted into the plate fin of the evaporator, and the heating means for operating the evaporator is installed at the evaporator part of the heat pipe, it is efficiently heated and biased inside. Even in the case of defrosting efficiently, there is little temperature rise in the refrigerator during defrosting, it is possible to obtain a cooling device that can be defrosted by the evaporator alone.

Claims (2)

A plate fin and an evaporator comprising a cooling tube inserted into the plate fin, wherein the condenser portion of the heat pipe is inserted into the plate fin, and at the same time, a heating means is installed at the evaporator defrosting portion of the heat pipe. Cooling apparatus characterized in that. 2. The cooling apparatus according to claim 1, wherein the evaporator and the cooling means of the heat pipe are installed so as to be located below the evaporator and outward from the bottom of the evaporator.