KR100494389B1 - Refrigerator and defroster - Google Patents

Abstract

The present invention relates to a refrigerator comprising a main body and a compressor and an evaporator, wherein the heat pipe is formed of a closed loop to circulate the working refrigerant; A first heat exchanger provided in one region of the heat pipe to absorb heat generated from the compressor; A second heat exchanger disposed at a position adjacent to the evaporator in a region above the first heat exchanger of the heat pipe and dissipating heat to the evaporator; And a control valve provided in one region between the first and second heat exchange parts to open and close the heat pipe, and when the control valve is opened, the working refrigerant cooled and liquefied in the second heat exchanger is first heat exchanged. It is characterized in that the circulated while being heated by the vaporized working refrigerant by gravity. As a result, the structure is simple, and the frost of the evaporator can be easily removed by circulating the working refrigerant using the waste heat of the compressor without consuming power. In addition, by providing a temperature detector for detecting the surface temperature of the evaporator, the temperature detection unit is lower than the reference temperature and the defrosting process is performed every time the compressor is stopped, so that even a small amount of frost generated in the evaporator is removed In addition to improving the performance of the evaporator, it is possible to prevent a large amount of frost is generated in a part of the evaporator to prevent the rise of the temperature of a part of the evaporator during defrosting to increase the internal temperature of the refrigerator. In addition, by repeatedly opening and closing the control valve at a predetermined time interval, it is possible to prevent the surface temperature of the compressor is sharply lowered to prevent defrosting.

Description

Refrigerator and defroster {REFRIGERATOR AND DEFROSTER}

The present invention relates to a refrigerator, and more particularly, to a refrigerator and a defrosting apparatus having a structure for removing the defrost of the evaporator.

Generally, a refrigerating device includes a compressor for compressing a gaseous refrigerant at a high temperature and high pressure, a condenser for condensing the gaseous refrigerant compressed from the compressor into a liquid state, a capillary tube for converting the liquefied refrigerant into a low temperature, low pressure state, And an evaporator that cools the surrounding air by absorbing latent heat of vaporization to vaporize the refrigerant liquefied from the capillary to low temperature and low pressure. Thus, by supplying the cooled air around the evaporator into the freezer compartment and the refrigerating compartment, the inside of the freezer compartment and the refrigerating compartment can be cooled.

Such a refrigeration apparatus may be used in various heat exchangers such as a refrigerator and an air conditioner. Hereinafter, the refrigeration apparatus provided in the refrigerator will be described.

Generally, a refrigerator includes a main body partitioned into a freezer compartment and a refrigerating compartment, a door for rotating opening and closing the front openings of the freezer compartment and the refrigerating compartment, and a freezing device for cooling the inside of the freezer compartment and the refrigerating compartment.

Since the surface temperature of the evaporator provided in the refrigerator of the refrigerator is lower than the air temperature in the refrigerator, moisture present in the air in the refrigerator is attached to the surface of the evaporator in the form of frost. Such frost causes a decrease in the heat exchange capacity of the evaporator, and thus requires a defrosting device such as an electric heater to remove frost generated in the evaporator.

1 and 2, the defrost heater 50 is installed below the cooler chamber 30 at the rear side of the freezer compartment 70 of the refrigerator and is defrosted by an electrical signal of the controller. In the defrosting apparatus of the refrigerator for defrosting the defrost heater 50 to generate heat generated by the cooler 40, the defrosting tube 1 is provided on the rear side of the cooler 40 installed inside the cooler chamber 30. The heat exchange part 4 formed by bending up and down several times is formed, and on the rear side of the heat exchange part 4, an aluminum reflector plate is disposed so that heat radiated from the heat exchange part 4 is not transmitted to the rear surface of the cooler chamber 30. 31) is attached to the rear side of the heat exchange unit 4 and is fixedly installed on the inner upper and lower sides.

The defrost pipe 1 continues downward and communicates with one side of the defrost antifreeze storage tank 2 installed at the upper end of the compressor 21 inside the machine room 20. The pump 3 is connected to the other side of the storage tank 2. ) And is continuously extended upward to extend to the heat exchange part 4 on the cooler chamber 30 side.

On the other hand, the cold air outlet 37 is formed on the upper side of the louver insulator 36 provided on the rear side of the freezing chamber 70, and the lower side of the thermo-air damper to allow the cold air outlet 37 to be closed or opened in accordance with the electrical signal of the controller. 35) is installed.

By such a configuration, the defrosting apparatus of the conventional refrigerator is cooled by stopping the operation of the compressor 21 when the control unit changes the refrigerator from the cooling mode to the defrost mode by the signal of the frost sensor or the signal of the defrost timer. The system is stopped, the defrosting system is activated so that the defrost heater 50 starts to generate heat, and the pump 3 and the thermo damper 35 are operated.

Therefore, ethylene glycol or propylene glycol liquid, which is a defrosting antifreeze in the storage tank 2, is supplied by the pump 3 to the heat exchange part 4 in the cooler chamber 30 through the defrosting pipe 1, and at the same time The thermo damper 35 is operated to close the cold air discharge port 37 and to rapidly rotate the freezer compartment fan 33.

The defrosting antifreeze stored inside the storage tank 2 is heated to a high temperature of 90 ° C. to 100 ° C. by the operating heat of the compressor 21 in the cooling mode and is converted into the defrost mode by a signal from the controller. It is discharged along the correlation (1) to heat the heat exchanger (4) to generate a strong hot air by the rotation of the freezing chamber fan 33 is discharged to the cooler 40 to remove the frost formed on the cooler (40). .

Thus, not only the defrost formed by the heat generation of the defrost heater 50 installed below the cooler, but also the thermodamper 35 is operated to prevent heat inflow into the freezer compartment, and the antifreeze that has been heated to high temperature using the heat of the compressor 21 is cooled. The defrosting may be performed in a short time by supplying the heat to the chamber 30 and radiating the heat radiated from the heat exchange part 47 by using the freezing chamber fan 33 to generate forced hot air to the cooler 40.

However, such a defroster of the conventional refrigerator is provided with a defrost heater to remove the frost of the cooler, and also by using a pump to supply the heat of the compressor to the heat exchanger, the structure is not only complicated, but also consumes a lot of power There is a problem.

In general, conventional refrigerators are designed to perform defrosting every 10 to 48 hours, although there are some differences depending on conditions, and evaporators are accumulated by frost accumulated for a long time after defrosting is completed. There is a problem of poor performance.

In addition, when a large amount of frost is generated in a part of the evaporator, the temperature is increased at the time of defrosting at the point where the frost of the evaporator is not generated, there is a problem to increase the internal temperature of the refrigerator.

Accordingly, an object of the present invention is to provide a refrigerator and a defrosting device which is simple in structure, can reduce power consumption, and can improve the performance of an evaporator.

According to the present invention, a refrigerator comprising a main body and a compressor and an evaporator provided in the main body, the refrigerator comprising: a heat pipe formed of a closed loop so that the working refrigerant can be circulated; A first heat exchanger provided in one region of the heat pipe to absorb heat generated from the compressor; A second heat exchanger disposed at a position adjacent to the evaporator in one upper region of the first heat exchanger of the heat pipe and dissipating heat to the evaporator; And a control valve provided between the first heat exchange part and the second heat exchange part to open and close the heat pipe, and when the control valve is opened, the working refrigerant cooled and liquefied in the second heat exchanger is first heat exchanged. It is achieved by a refrigerator characterized by circulating while heating the vaporized working refrigerant by means of gravity.

Here, it is preferred that the control valve and the second heat exchanger further comprises a refrigerant container for storing the working refrigerant cooled by the second heat exchanger and liquefied.

Preferably, the first heat exchanger includes a heat storage tank that contacts the compressor and stores heat generated from the compressor.

It is preferable to further include a temperature detector for detecting the surface temperature of the evaporator.

The control valve is opened at the moment when the operation of the compressor is stopped, and is preferably closed when the operation of the compressor is started or the temperature detected by the temperature detector is higher than a predetermined reference temperature.

Preferably, the control valve is repeatedly opened and closed at a predetermined time interval while the compressor is stopped and when the temperature detector is lower than the reference temperature.

Preferably, the second heat exchange part is bent several times in a shape corresponding to the evaporator.

Preferably, the first heat exchange part is formed by spirally winding the heat pipe in contact with the compressor to store heat generated from the compressor.

In addition, according to the present invention, the defrosting apparatus for defrosting the evaporator provided in the refrigerating device, comprising: a heat pipe formed of a closed loop so that the working refrigerant is circulated; A first heat exchanger provided in one region of the heat pipe to absorb heat generated from the compressor of the refrigerating device; A second heat exchanger disposed at a position adjacent to the evaporator in one upper region of the first heat exchanger of the heat pipe and dissipating heat to the evaporator; And a control valve provided in one region between the first and second heat exchange parts to open and close the heat pipe, and when the control valve is opened, the working refrigerant cooled and liquefied in the second heat exchanger is first heat exchanged. It is achieved by a defrosting device characterized in that it circulates while being heated in the section and circulated while evaporating the working refrigerant by gravity.

Prior to the description, in various embodiments, components having the same configuration will be representatively described in the first embodiment using the same reference numerals, and in other embodiments, only the configuration different from the first embodiment will be described. Do.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings a defrosting device for defrosting the refrigerator and the freezing device provided in the refrigerator.

3 and 4, the refrigerator according to the first embodiment of the present invention rotates the main body 110 including a freezer compartment and a refrigerating chamber (not shown) and the front opening of the main body 110. The refrigerator 113 and the surface of the evaporator 123 provided with a door 113, a lower portion and a rear of the main body 110 and having a compressor 121, an evaporator 123, etc. to cool the interior of the freezer compartment and the refrigerating compartment. It includes a defrosting device 140 for removing frost on the frost.

Defrost is generated on the surface of the evaporator 123 provided in the refrigerating device 120 by the temperature difference between the ambient air and the surface of the evaporator 123, and the heat exchange capability of the evaporator 123 is maintained during operation of the refrigerator. It causes a decrease.

The refrigerating device 120 includes a compressor 121 for compressing a gaseous refrigerant at a high temperature and high pressure, a condenser 126 for condensing the gaseous refrigerant compressed from the compressor 121 in a liquid state, and vaporizing the liquefied refrigerant. It includes an evaporator 123 for cooling the ambient air by absorbing the latent heat of evaporation, and a refrigerant pipe 125 for connecting the compressor 121 and the condenser 126 and the evaporator 123 so as to circulate the refrigerant.

Thus, by supplying the cooled air around the evaporator 123 into the freezer compartment and the refrigerating compartment, the inside of the freezer compartment and the refrigerating compartment can be cooled.

Defrost occurs on the surface of the evaporator 123 provided in the refrigerating device 120 by the temperature difference between the ambient air and the surface of the evaporator 123, the cause of reducing the heat exchange capacity of the evaporator (123). Becomes And, the defrosting device 140 is provided to remove the frost formed on the surface of the evaporator 123.

The defroster 140 is formed of a closed loop and provided with a heat pipe 141 in which a working refrigerant is circulated therein and provided in a lower region of the heat pipe 141 to be generated from the compressor 121. A first heat exchanger 150 for absorbing heat, a second heat exchanger 160 disposed at a position close to the evaporator 123 in an upper region of the heat pipe 141, and dissipating heat to the evaporator 123; A control valve 143 provided in one region between the first and second heat exchangers 150 and 160 to open and close the heat pipe 141 and a second heat exchanger provided between the control valve 143 and the second heat exchanger 160. A refrigerant cylinder 145 for storing the working refrigerant liquefied in the unit 160 and a temperature detector 124 for detecting the surface temperature of the evaporator 123.

The first heat exchange unit 150 is in contact with the upper portion of the compressor 121, and has a heat storage tank 151 for storing the waste heat generated from the compressor 121 whose surface temperature is 50 ℃ or more during operation of the refrigerator.

The heat storage tank 151 is preferably made of a metal material having excellent thermal conductivity, the heat pipe 141 is provided to pass therein, and stores the waste heat recovered from the compressor 121 to heat the heat pipe 141. To pass. As a result, the working refrigerant circulating in the heat pipe 141 increases in temperature by the waste heat of the compressor 121 and vaporizes. In addition, although the working refrigerant is preferably ethanol having a low specific heat, the waste heat of the compressor 121 may easily increase the temperature, and may be another material that can be easily vaporized.

The second heat exchanger 160 is bent several times in a shape corresponding to the evaporator 123 in order to facilitate heat exchange with the evaporator 123, and the working refrigerant vaporized at high temperature through the first heat exchanger 150 is removed. Is introduced into the upper portion of the second heat exchanger 160 is condensed while passing through the second heat exchanger 160 is provided to escape to the lower portion by gravity. Thus, the defrosting process is performed by the heat released while the high temperature working refrigerant passing through the second heat exchanger 160 is condensed. Then, the working refrigerant exiting the second heat exchanger 160 releases heat to become a liquid state.

The temperature detector 124 is provided below the evaporator 123 to detect the surface temperature of the evaporator 123. When the detected temperature is higher than a predetermined reference temperature, the control valve 143 is closed. Predetermined reference temperature according to the present invention is preferably 1 ℃ that can be dissolved all of the frost on the surface of the evaporator 123, in consideration of the set temperature and the outside air temperature of the refrigerating chamber and freezer compartment 1 ℃ or more or less than 1 ℃ Of course, it can be set to a temperature of.

The control valve 143 is a heat between the refrigerant cylinder 145 and the first heat exchange unit 150 to control the supply of the working refrigerant exiting the second heat exchange unit 160 to the first heat exchange unit 150 again. It is provided in the pipe 141. In addition, the control valve 143 is opened at the moment when the temperature detected by the temperature detector 124 is lower than the reference temperature and the operation of the compressor 121 is stopped, and the temperature of the temperature detector 124 is higher than the reference temperature. Or close when the compressor 121 starts to operate again.

The coolant cylinder 145 is provided in the heat pipe 141 connecting between the control valve 143 and the second heat exchanger 160, and is preferably provided at a position higher than the first heat exchanger 150. In addition, the coolant cylinder 145 is provided in a cylindrical shape to store the liquefied working refrigerant cooled by the second heat exchanger 160, but is provided in a different shape such as a polygonal cylindrical shape to store the liquefied working refrigerant. May be

Accordingly, when the control valve 143 is opened, the working refrigerant cooled and liquefied in the second heat exchanger 160 from the coolant cylinder 145 located above the first heat exchanger 150 is liquefied in the first heat exchanger 150. ) By heating the vaporized working refrigerant by gravity, passing through the first heat exchange unit 150, the heat vaporized to move to the second heat exchange unit 160, remove the low temperature frost and gravity to the condensed refrigerant state By the movement to the refrigerant cylinder 145 is circulated. When the control valve 143 is closed, the defrosting process is terminated when all of the refrigerant that has existed in the liquid state in the second heat exchange unit 160 because the operating refrigerant does not circulate. Therefore, it is possible to easily remove the frost of the evaporator 123 by circulating the working refrigerant using the waste heat of the compressor 121 without consuming power.

By such a configuration, a process of operating the defrosting apparatus of the refrigerator according to the first embodiment of the present invention will be described with reference to the flowcharts and operation state diagrams shown in FIGS. 5 and 6.

First, when the operation of the refrigerator is started, the compressor 121 is operated to cool the freezer compartment and the refrigerating compartment of the refrigerator, and the surface temperature of the compressor 121 is maintained at 50 ° C. or higher. In this case, the heat storage tank 151 is a compressor. The waste heat of 121 is absorbed to raise the temperature (S1). Then, the operation of the compressor 121 and the temperature of the temperature detector 124 are compared with the reference temperature (1 ° C.) (S3), so that the compressor 121 continues to operate or the temperature of the temperature detector 124 is referenced. When the temperature is higher than 1 ° C., the heat storage tank 151 continuously absorbs waste heat from the compressor 121, the operation of the compressor 121 is stopped, and the temperature of the temperature detector 124 is referred to as the reference temperature (1 ° C.). If lower, the control valve 143 is opened (S5). Then, the working refrigerant in the liquid state is supplied to the first heat exchange unit 150 by gravity from the refrigerant cylinder 145, and the operating refrigerant heated and vaporized in the first heat exchange unit 150 is the first heat exchange unit 150. It is pushed by the working refrigerant in the liquid state supplied to the second heat exchange unit 160 is carried out defrosting (S7). Then, it is again determined whether the compressor 121 is operated (S9), and when the compressor 121 is in operation, the control valve 143 is closed (S13) to finish the defrosting process, and the heat storage tank 151 is connected to the compressor. When the waste heat of 121 is absorbed and the operation of the compressor 121 is stopped, the temperature of the temperature detector 124 provided below the evaporator 123 is compared with the reference temperature (1 ° C.) (S11). When the temperature of the temperature detector 124 is lower than the reference temperature (1 ° C.), the control valve 143 is continuously opened to perform a defrost process, and the temperature of the temperature detector 124 is higher than the reference temperature (1 ° C.). If large, the control valve 143 is closed (S13) to end the defrosting process. And, the defrosting process is carried out each time the temperature of the temperature detector 124 is lower than the reference temperature (1 ℃) and the compressor 121 stops operation, even if a small amount of frost generated in the evaporator 123 is removed The performance of the evaporator is improved.

In the above-described embodiment, although the cylindrical refrigerant cylinder 145 is separately provided between the control valve 143 and the second heat exchanger 160, the liquefied working refrigerant can be smoothly circulated when the control valve 143 is opened. Refrigerant cylinders of various shapes may be provided, and the refrigerant cylinder 145 may be omitted.

7 is an operational state diagram of a defrosting process of a refrigerator according to a second embodiment of the present invention.

The control valve 143 provided in the defroster 140 of the refrigerator according to the second embodiment of the present invention is opened at the moment when the temperature of the temperature detector 124 is lower than the reference temperature and the operation of the compressor 121 is stopped. When the temperature of the temperature detector 124 is higher than the reference temperature or the compressor 121 starts to operate again, it is closed as in the first embodiment.

However, the control valve 143 provided in the defroster 140 of the refrigerator according to the second embodiment of the present invention may be used while the compressor 121 is stopped and when the temperature of the temperature detector 124 is lower than the reference temperature. It is repeatedly opened and closed at a predetermined time interval. The predetermined time interval at which the control valve 143 is opened is a liquid working refrigerant supplied from the refrigerant tank 145 to the first heat exchange part 150 through the heat pipe 141 when the control valve 143 is opened. The predetermined time interval between the control valve 143 and the control valve 143 may be set in various amounts, such that the working refrigerant in the liquid state supplied when the control valve 143 is opened is heated in the first heat exchange unit 150. It may be set in various ways in consideration of the time to vaporize.

For example, when the time interval between the opening and closing of the control valve 143 is set to 5 seconds, when the temperature of the temperature detection unit lower than the reference temperature and the operation of the compressor 121 is stopped, the control valve 143 is Opened for 5 seconds, the operation liquid of the liquid is supplied to the first heat exchange unit 150 by the gravity pipe 145 through the heat pipe 141 by the gravity and at the same time heated and vaporized operation in the first heat exchange unit 150 The refrigerant is circulated to the second heat exchanger 160 to perform defrosting. Then, the control valve 143 is closed for the next 5 seconds, the working refrigerant in the liquid state supplied to the first heat exchange unit 150 is heated to vaporize. Then, for the next 5 seconds, the control valve 143 is opened again to supply the working refrigerant in the liquid state to the first heat exchange unit 150. As such, the control valve 143 is repeatedly opened and closed at a predetermined time interval to perform the defrosting operation while the compressor 121 is stopped and the temperature of the temperature detector 124 is lower than the reference temperature. .

Thus, the control valve 143 of the defrosting device 140 according to the second embodiment is repeatedly opened and closed at a predetermined time interval, so that the control valve 143 of the first embodiment of the above-described temperature detection unit 124 The temperature is lower than the reference temperature and is continuously opened while the compressor 121 is stopped, so that the working refrigerant in the liquid state is continuously supplied to the first heat exchanger 150 to drastically lower the surface temperature of the compressor 121. Failure to heat the refrigerant can improve the problem that defrosting is not performed properly.

8 is a partial perspective view of a refrigerator according to a third embodiment of the present invention. Unlike the defroster 140 of the refrigerator according to the first and second embodiments, the defroster 140 of the refrigerator according to the third embodiment does not have a heat storage tank separately provided in the first heat exchanger 150a. The heat pipe 141 is formed by winding a spiral several times. Thus, the refrigerator according to the third embodiment of the present invention can not only achieve the object of the present invention but also simplify the configuration of the refrigerator according to the first and second embodiments.

As described above, the defrosting apparatus of the present invention has been described as an example of defrosting the freezing apparatus of the refrigerator, but the defrosting apparatus may be installed in an apparatus such as an air conditioning apparatus including a freezing apparatus to perform defrosting. to be.

As described above, the refrigerator according to the present invention includes a heat pipe formed of a closed loop such that the working refrigerant can be circulated, a first heat exchanger provided under the heat pipe to absorb heat generated from the compressor, and an evaporator on the heat pipe. And a second heat exchanger disposed at a position close to the one for dissipating heat to the evaporator, and a control valve provided at one region between the first and second heat exchangers to open and close the heat pipe. Therefore, when the control valve is opened, the working refrigerant cooled and liquefied in the second heat exchanger is heated in the first heat exchanger to push out the vaporized working refrigerant by gravity, and the vaporized working refrigerant rises to the second heat exchanger to the evaporator. Defrost can be carried out while releasing heat to condense. Therefore, a device such as a pump for circulating the working refrigerant is unnecessary, so the structure is simple, and the frost of the evaporator can be easily removed by circulating the working refrigerant using the waste heat of the compressor without consuming power.

In addition, the defrosting apparatus of the refrigerator according to the present invention provides a temperature detecting unit for detecting the surface temperature of the evaporator, the temperature detecting unit is lower than the reference temperature and the defrosting process is performed whenever the compressor stops operating, the evaporator Not only a small amount of frost generated in the evaporator can be removed to improve the performance of the evaporator. In addition, a large amount of frost can be prevented from being generated in part of the evaporator. Can be prevented.

In addition, the defrosting apparatus of the refrigerator according to the present invention by repeatedly opening and closing the control valve at a predetermined time interval, it is possible to prevent the surface temperature of the compressor is sharply lowered to prevent defrosting.

As described above, according to the present invention, the structure is simple and the defrost of the evaporator can be easily removed by circulating the working refrigerant using the waste heat of the compressor without consuming power.

In addition, by providing a temperature detector for detecting the surface temperature of the evaporator, the temperature detection unit is lower than the reference temperature and the defrosting process is performed every time the compressor is stopped, so that even a small amount of frost generated in the evaporator is removed In addition to improving the performance of the evaporator, it is possible to prevent a large amount of frost is generated in a part of the evaporator to prevent the rise of the temperature of a part of the evaporator during defrosting to increase the internal temperature of the refrigerator.

In addition, by repeatedly opening and closing the control valve at a predetermined time interval, it is possible to prevent the surface temperature of the compressor is sharply lowered to prevent defrosting.

1 is a side view showing a defrosting apparatus of a conventional refrigerator;

2 is a rear cross-sectional view of a conventional refrigerator,

3 is a rear perspective view of the refrigerator according to the first embodiment of the present invention;

4 is a partial perspective view of the refrigerator of FIG. 3;

5 is a flowchart illustrating a defrosting process of a refrigerator according to a first embodiment of the present invention;

6 is an operating state of the defrost process of the refrigerator according to the first embodiment of the present invention,

7 is an operating state of the defrost process of the refrigerator according to the second embodiment of the present invention,

8 is a partial perspective view of a refrigerator according to a third embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

110: body 113: door

120: refrigeration unit 121: compressor

123: evaporator 124: temperature detector

125: refrigerant pipe 126: condenser

140: defrosting device 141: heat pipe

143: control valve 145: refrigerant cylinder

150: first heat exchanger 151: heat storage tank

160: second heat exchanger

Claims (16)

A refrigerator comprising a main body and a compressor and an evaporator provided in the main body, A heat pipe formed of a closed loop to circulate the working refrigerant; A first heat exchanger provided in one region of the heat pipe to absorb heat generated from the compressor; A second heat exchanger disposed at a position adjacent to the evaporator in one upper region of the first heat exchanger of the heat pipe and dissipating heat to the evaporator; A control valve provided between the first heat exchange part and the second heat exchange part to open and close the heat pipe; A refrigerant tank provided between the control valve and the second heat exchanger to store a working refrigerant liquefied by the second heat exchanger, When the control valve is opened, the liquefied working refrigerant stored in the refrigerant container is circulated while being heated in the first heat exchange unit by pushing the vaporized working refrigerant by gravity. delete The method of claim 2, And the first heat exchanger includes a heat storage tank configured to contact the compressor and store heat generated from the compressor. The method according to any one of claims 1 to 3, And a temperature detector for detecting a surface temperature of the evaporator. The method of claim 4, wherein And the control valve is opened at the moment when the operation of the compressor is stopped, and is closed when the operation of the compressor is started or the temperature detected by the temperature detector is higher than a predetermined reference temperature. The method of claim 4, wherein And the control valve is repeatedly opened and closed at a predetermined time interval while the compressor is stopped and when the temperature detector is lower than the reference temperature. The method of claim 4, wherein And the second heat exchange part is bent several times in a shape corresponding to the evaporator. The method of claim 2, And the first heat exchange part is formed by winding the heat pipe in contact with the compressor several times in order to store heat generated from the compressor. In the defrosting apparatus for defrosting the evaporator provided in the freezer, A heat pipe formed of a closed loop to circulate the working refrigerant; A first heat exchanger provided in one region of the heat pipe to absorb heat generated from the compressor of the refrigerating device; A second heat exchanger disposed at a position adjacent to the evaporator in one upper region of the first heat exchanger of the heat pipe and dissipating heat to the evaporator; A control valve provided between the first heat exchange part and the second heat exchange part to open and close the heat pipe; A refrigerant tank provided between the control valve and the second heat exchanger to store a working refrigerant liquefied by the second heat exchanger, When the control valve is opened, the liquefied working refrigerant stored in the coolant container is heated in the first heat exchange unit and circulated while pushing the vaporized working refrigerant by gravity by circulating. delete The method of claim 10, And the first heat exchanger includes a heat storage tank configured to contact the compressor and store heat generated from the compressor. The method according to any one of claims 9 to 11, Defrosting apparatus further comprises a temperature detector for detecting the surface temperature of the evaporator. The method of claim 12, And the control valve is opened at the moment when the operation of the compressor is stopped, and is closed when the operation of the compressor is started or the temperature detected by the temperature detector is higher than a predetermined reference temperature. The method of claim 12, And the control valve is repeatedly opened and closed at a predetermined time interval while the compressor is stopped and when the temperature detector is lower than the reference temperature. The method of claim 12, Defrosting apparatus, characterized in that the second heat exchange unit is bent several times in a shape corresponding to the evaporator. The method of claim 9, And the first heat exchanger is wound around the heat pipe several times in a spiral manner to store heat generated from the compressor.