KR20180026977A - Defrosting device and refrigerator having the same - Google Patents

Abstract

According to the present invention, disclosed is a defrosting apparatus, comprising: a heating unit arranged on an evaporator; and a heat pipe having at least a portion closely arranged to a cooling pipe to radiate the heat on the cooling pipe of the evaporator by hydraulic fluid at high temperature heated and transported by the heating unit, wherein both-end units are connected to an entrance and an exit of the heating unit, respectively. The heating unit comprises: a heater case having an inner flow path formed with the entrance and the exit on both-end units; and a heater attached to the outer surface of the heater case to heat the hydraulic fluid inside the heater case. Both-end units of the heat pipe are inserted to the inside of the heater case through the entrance and the exit, and are communicated with the inner flow path.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a defrosting device and a refrigerator having the defrosting device.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrosting device for removing frost on a evaporator provided in a refrigeration cycle, and a refrigerator having the defrosting device.

The refrigerator is a device for keeping food stored in the refrigerator at low temperature by using cold air generated by a refrigeration cycle in which a process of compression-condensation-expansion-evaporation is continuously performed.

The refrigerating cycle in the refrigerating compartment includes a compressor for compressing the refrigerant, a condenser for condensing the refrigerant in the high-temperature and high-pressure state compressed by the compressor through heat dissipation, and a condenser for condensing the refrigerant, And an evaporator for cooling the air. A capillary or an expansion valve is provided between the condenser and the evaporator to increase the flow rate of the refrigerant and lower the pressure so that the evaporation of the refrigerant flowing into the evaporator can easily occur.

As described above, the evaporator provided in the refrigeration cycle lowers the ambient temperature by using the cool air generated by the circulation of the refrigerant flowing in the cooling pipe. In this process, when the temperature difference with the surrounding air occurs, the moisture in the air condenses on the surface of the cooling pipe and freezes and develops into a gaseous state. Frosting on the evaporator acts as a factor to lower the heat exchange efficiency of the evaporator.

As a defrosting operation for removing the impurities cast on the evaporator, a defrosting method using an electric heater is conventionally used. In recent years, a defrost apparatus using a heat pipe has been developed and emerged as a heat generating means. A related art is Korean Patent No. 10-0469322 entitled "Evaporator ". In this patent, the defrost heater is configured to be operated for a set time or until the freezer reaches a set temperature after the operation of the compressor and the fan is stopped.

As shown in FIG. 5, one of the defrost apparatuses developed by the company (unoccupied state at the time of filing) consists of a main case and a cap which is connected to both ends of the heat pipe to complete a circulating flow path of the working liquid . The main case has an empty space for filling the working fluid therein, and a heater is attached to an outer surface of the main case. The cap is coupled to the heat pipe so as to cover both side openings of the main case.

As described above, since the heater case is composed of the main case and the cap, they have to be individually machined. In addition, when the stopper was welded to the main case, a separate jig was required to place them in the correct position.

Further, due to the above structure, welding was required between the main case and the plug, between the plug and the heat pipe. Such a plurality of welding points not only cause difficulties in the production process but also lead to an increase in production costs.

Korean Patent No. 10-0469322 (Announcement of Feb. 2, 2005)

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a more simple connection structure in which the heater case and the heat pipe can be connected without the stopper by improving the conventional structure disadvantage that the heater case requires a plug for connection with the heat pipe .

A second object of the present invention is to provide a connection structure in which a welding point for connection between a heater case and a heat pipe can be reduced.

To achieve the first object of the present invention, a defrost apparatus of the present invention comprises: a heating unit provided in an evaporator; And at least a part of which is disposed adjacent to the cooling pipe so as to be radiated to the cooling pipe of the evaporator by the high temperature working liquid which is heated and conveyed by the heating unit and whose both ends are connected to the inlet and the outlet of the heating unit, Wherein the heating unit includes a heater case having a single body and having an inlet and an outlet at both ends; And a heater attached to an outer surface of the heater case to heat a working fluid in the heater case, wherein both ends of the heat pipe are inserted into the heater case through the inlet and the outlet, It communicates with the flow path.

The inner flow path may extend along the longitudinal direction of the heater case.

The heating unit may include: a first welding portion formed to fill a gap between the heat pipe and the outlet; And a second welding portion formed to fill a gap between the heat pipe and the inlet.

Wherein the heat pipe includes a first heat pipe and a second heat pipe respectively disposed on a front portion and a rear portion of the evaporator, wherein the inner flow path includes a first inlet connected to both ends of the first heat pipe, A first inner flow path having an outlet; And a second inner flow path having a second inlet and a second outlet respectively connected to both ends of the second heat pipe and extending in parallel with the first inner flow path.

The heater case may include a working fluid inlet formed on one surface of the heater case to communicate with the first and second inner flow paths for injecting the working fluid.

The working fluid injection port may be formed to overlap the respective portions of the first and second internal flow paths in the thickness direction of the heater case so as to communicate the first and second internal flow paths with each other.

The working fluid injection port may be formed at a position spaced from the one end of the heat pipe inserted into the heater case through the outlet to the inlet side.

A plate-like ceramic heater attached to the outer surface of the heater case may be used as the heater.

The heater case is divided into an active heat generating portion corresponding to a portion where the heater is disposed and a passive heat generating portion corresponding to a portion where the heater is not disposed and the returning fluid returned through the inlet is reheated to prevent back flow , One end of the heat pipe inserted into the inlet may communicate with the manual heat generating portion.

The heater case may include first and second extension pins formed on both sides of the heater case, the first and second extension pins extending from the outer surface to the both sides of the heater attached to the outer surface.

An insulating material is disposed on a rear surface of the heater, and a recessed space formed by the back surface of the insulating material and the first and second extending pins can be filled with a sealing member.

The heating unit is attached to the heater case, and electrically disconnects the heater from the power supply unit at a predetermined temperature or higher, and electrically connects the heater and the power supply unit at a temperature lower than a predetermined temperature And may further include a bimetal switch.

In this structure, a second object of the present invention is to provide a method of manufacturing a semiconductor device, wherein a first weld is formed to fill a gap between the first and second heat pipes and the first and second outlets, And filling the gap between the heat pipe and the first and second inlets.

To achieve the first object of the present invention, there is provided a defrost apparatus comprising: a heating unit provided in an evaporator; And a first heat pipe and a second heat pipe which are respectively disposed on the front and rear sides of the evaporator and radiate heat to the evaporator by a high temperature working liquid heated and transferred by the heating unit, A heater case having a chamber therein and having a first outlet and a second outlet communicating with the chamber at one end and having a first inlet and a second inlet communicating with the chamber at the other end; And a heater attached to an outer surface of the heater case to heat a working fluid in the heater case, wherein both ends of the first heat pipe are connected to the inside of the heater case through the first inlet and the first outlet, And both ends of the second heat pipe are inserted into the heater case through the second inlet and the second outlet to communicate with the chamber.

The heater case is formed as a single body.

The heater case includes a first joint formed between the first outlet and the second outlet and having an upper surface and a lower surface bonded to each other; And a second joint formed between the first inlet and the second inlet and having an upper surface and a lower surface bonded to each other.

The heater case may be provided with a working fluid inlet formed to communicate with the chamber for injecting the working fluid.

A plate-like ceramic heater attached to the outer surface of the heater case may be used as the heater.

The heater case is divided into an active heat generating portion corresponding to a portion where the heater is disposed and a passive heat generating portion corresponding to a portion where the heater is not disposed and the returning fluid returned through the inlet is reheated to prevent back flow , One end of the first and second heat pipes inserted into the inlet may communicate with the manual heat generating portion.

The heating unit may include: a first holder disposed to cover one surface of the heater case; A second holder which is arranged to cover the other surface of the heater case in which the heater is disposed and is fastened to the first holder; An insulating material disposed to cover the heater; And a sealing member filled to cover the insulating material through a filling hole of the second holder.

The heating unit is attached to the heater case, and electrically disconnects the heater from the power supply unit at a predetermined temperature or higher, and electrically connects the heater and the power supply unit at a temperature lower than a predetermined temperature And may further include a bimetal switch.

In this structure, a second object of the present invention is to provide a method of manufacturing a semiconductor device, wherein a first weld is formed to fill a gap between the first and second heat pipes and the first and second outlets, And filling the gap between the heat pipe and the first and second inlets.

At this time, the first welding portion is formed to fill a gap between the upper surface and the lower surface forming the first bonding portion, and the second welding portion is formed to fill the gap between the upper surface forming the second bonding portion and the lower surface .

Effects of the present invention obtained through the above-mentioned solution are as follows.

First, the heater case is formed as a single body having an outlet and an inlet formed at both ends, and both end portions of the heat pipe are inserted into the heater case through the outlet and the inlet, so that the heater case and the heat pipe Can be implemented.

Secondly, since the conventional stopper is unnecessary, the process for welding the stopper is eliminated, thereby simplifying the production process. Furthermore, welding the gap between the first and second outlets formed side by side and the heat pipe at one time, welding the gap between the first and second inlets formed in parallel and the heat pipe at one time, And thus the production cost can be reduced.

FIG. 1 is a longitudinal sectional view schematically showing a configuration of a refrigerator according to an embodiment of the present invention. FIG.
FIGS. 2 and 3 are a front view and a perspective view showing a first embodiment of a defrost apparatus applied to the refrigerator of FIG. 1;
FIG. 4 is an exploded perspective view showing the first embodiment of the heating unit shown in FIG. 3; FIG.
5 is a conceptual view showing a heater case included in a conventional defrost apparatus.
6 is a perspective view showing the heater case shown in Fig. 4. Fig.
7 is a cross-sectional view taken along line AA of the heater case shown in Fig. 6; Fig.
FIG. 8 is a conceptual view showing a connection structure between the heater case and the heat pipe shown in FIG. 4. FIG.
9 is a cross-sectional view of the heating unit shown in Fig. 8 taken along line BB; Fig.
FIG. 10 is a conceptual view of the heater shown in FIG. 4; FIG.
FIGS. 11 and 12 are conceptual diagrams respectively showing a state where power is connected to the heater by the bimetallic switch shown in FIG. 4 and a state where the power connection is cut off.
FIGS. 13 and 14 are conceptual diagrams showing an example of the bimetal switch shown in FIG. 4. FIG. 13 is a conceptual view showing a closed state of the bimetal switch, and FIG. 14 is a conceptual diagram showing a state in which the bimetal switch is opened.
15 and 16 are conceptual diagrams illustrating the circulation of the working fluid in the pre-operation and post-operation states of the heater.
17 and 18 are a front view and a perspective view showing a second embodiment of the defrost apparatus applied to the refrigerator of FIG.
FIG. 19 is an exploded perspective view showing a second embodiment of the heating unit shown in FIG. 3; FIG.
FIG. 20 is a perspective view showing the heater case shown in FIG. 19; FIG.
Fig. 21 is a front view of the heater case shown in Fig. 19; Fig.
22 is a conceptual view showing a method of manufacturing the heater case shown in Fig.
23 is a conceptual view showing a connection structure between the heater case and the heat pipe shown in Fig.

Hereinafter, a defrosting apparatus and a refrigerator having the defrosting apparatus according to the present invention will be described in detail with reference to the drawings.

In the present specification, the same or similar reference numerals are assigned to the same or similar components in different embodiments, and redundant explanations thereof will be omitted.

In addition, the structure applied to any one embodiment may be applied to another embodiment as long as the different embodiments are not structurally and functionally inconsistent.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be obscured.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It should be understood that it includes water and alternatives.

1 is a longitudinal sectional view schematically showing a configuration of a refrigerator 100 according to an embodiment of the present invention.

The refrigerator (100) is a device for keeping food stored in the refrigerator at a low temperature by using cold air generated by a refrigeration cycle in which a process of compression-condensation-expansion-evaporation is continuously performed.

As shown in the figure, the refrigerator body 110 has a storage space for storing food therein. The storage space may be separated by the partition wall 111 and may be divided into a refrigerating chamber 112 and a freezing chamber 113 according to a set temperature.

In this embodiment, a top mount type refrigerator in which the freezing chamber 113 is disposed on the refrigerating chamber 112 is shown, but the present invention is not limited thereto. The present invention is also applicable to a bottom freezer type refrigerator having a side-by-side type refrigerator in which a refrigerating chamber and a freezing chamber are disposed in the left and right direction, a refrigerating chamber in an upper portion thereof and a freezing chamber in a lower portion thereof .

A door is connected to the refrigerator body 110 to open and close the front opening of the refrigerator body 110. In this figure, the refrigerating chamber door 114 and the freezing chamber door 115 are configured to open and close the refrigerating chamber 112 and the freezing chamber 113, respectively. The door may be variously constructed of a rotatable door rotatably connected to the refrigerator body 110, a drawer-type door slidably connected to the refrigerator body 110, and the like.

The refrigerator body 110 is provided with at least one storage unit 180 (for example, a shelf 181, a tray 182, a basket 183, etc.) for efficiently utilizing the internal storage space. For example, the shelf 181 and the tray 182 may be installed inside the refrigerator body 110, and the basket 183 may be installed inside the door 114 connected to the refrigerator body 110.

On the other hand, a cooling chamber 116 provided with an evaporator 130 and a blowing fan 140 is provided on the rear side of the freezing chamber 113. The partition wall 111 is formed with a refrigerating chamber returning duct 111a and a freezing chamber returning duct 111b through which the air of the refrigerating chamber 112 and the freezing chamber 113 can be sucked and returned to the cooling chamber 116 side. A cool air duct 150 having a plurality of cool air discharge openings 150a communicating with the freezing chamber 113 and having a plurality of cool air discharge openings 150a is provided on the rear side of the refrigerating chamber 112. [

A machine room 117 is provided on the lower side of the backside of the refrigerator body 110 and a compressor 160 and a condenser (not shown) are provided in the machine room 117.

The air in the refrigerating compartment 112 and the freezing compartment 113 is supplied to the cooling chamber 116 through the refrigerating chamber return duct 111a and the freezing compartment return duct 111b of the partition 111 by the blowing fan 140 of the cooling chamber 116 The refrigerant is sucked into the evaporator 130 and exchanges heat with the evaporator 130 and is repeatedly discharged through the cold air outlet 150a of the refrigerant duct 150 to the refrigerating chamber 112 and the freezing chamber 113. [ At this time, the surface of the evaporator 130 is concealed by the temperature difference between the refrigerant return duct 111a and the circulating air flowing back through the freezer return duct 111b.

The evaporator 130 is provided with a defrosting device 170 and the water removed by the defrosting device 170 is discharged to the lower portion of the refrigerator body 110 through the defrost water discharge pipe 118. [ (Not shown).

Hereinafter, the defrost apparatus 170 will be described in more detail.

2 and 3 are a front view and a perspective view showing a first embodiment of the defrost apparatus 170 applied to the refrigerator 100 of FIG.

Referring to FIGS. 2 and 3, the evaporator 130 includes a cooling pipe 131, a plurality of cooling fins 132, and a support 133.

The cooling pipe 131 is repeatedly bent in a zigzag fashion to form a plurality of steps and a refrigerant is filled therein. The cooling pipe 131 may be made of aluminum.

The cooling pipe 131 may be composed of a combination of a horizontal pipe portion and a bending pipe portion. The horizontal piping sections are vertically arranged horizontally to form a plurality of stages, and the horizontal piping sections at each stage pass through the cooling fin 132. [ The bending piping portion is configured to connect the ends of the upper horizontal piping portion and the lower horizontal piping portion to each other to communicate with each other.

The cooling pipes 131 are supported through the support members 133 provided on both sides of the evaporator 130. At this time, the bending piping portion of the cooling pipe 131 is configured to connect the end portion of the upper horizontal pipe portion and the end portion of the lower horizontal pipe portion from the outside of the support base 133.

3, in this embodiment, the first cooling pipe 131 'and the second cooling pipe 131' are disposed on the front and rear portions of the evaporator 130 to form two rows, The first cooling pipe 131 'at the front and the second cooling pipe 131' 'at the rear are formed in the same shape as in FIG. 2, so that the second cooling pipe 131 " (131 ').

However, the present invention is not limited thereto. The first cooling pipe 131 'on the front side and the second cooling pipe 131' 'on the rear side may be formed in different shapes. On the other hand, the cooling pipe 131 may be formed in a single row.

A plurality of cooling fins 132 are disposed in the cooling pipe 131 at predetermined intervals along the extending direction of the cooling pipe 131. The cooling fin 132 may be formed of a flat plate made of an aluminum material and the cooling pipe 131 may be expanded in a state of being inserted into the insertion hole of the cooling fin 132 and firmly fitted into the insertion hole.

The plurality of supports 133 are provided on both left and right sides of the evaporator 130, and each of them is configured to support the cooling pipe 131 which extends vertically along the vertical direction to penetrate. The support base 133 is formed with an insertion groove or an insertion hole into which a heat pipe 172 to be described later can be fitted and fixed.

The defrosting device 170 is installed in the evaporator 130 to remove the property of the evaporator 130. The defrosting device 170 includes a heating unit 171 and a heat pipe 172 (heat transfer pipe).

The heating unit 171 is disposed below the evaporator 130 and is formed to generate heat when it is electrically connected to a control unit (not shown) and receives a driving signal from the control unit.

The controller may be configured to apply a driving signal to the heating unit 171 at predetermined time intervals. For example, the control unit may stop the operation of the compressor 160 and turn on the power supply unit 175 (see FIG. 11) (ON) after a certain period of time after the compressor 160 constituting the refrigeration cycle is operated ) So that power can be supplied to the heater 171b (see FIG. 4).

The control of the control unit is not limited to the time control. The control unit may be configured to apply a driving signal to the heating unit 171 when the sensed temperature of the cooling chamber 116 becomes lower than a predetermined temperature.

The heat pipe 172 is connected to the heating unit 171 to form a closed loop type flow path through which the working fluid F can circulate together with the heating unit 171. [ As the working fluid F, a refrigerant (for example, R-134a, R-600a, etc.) that exists in a liquid state under the freezing condition of the refrigerator 100 and that is phase- ) May be used. The heat pipe 172 may be formed of an aluminum material.

The heat pipe 172 may be composed of a first heat pipe 172 'and a second heat pipe 172' disposed on the front and rear portions of the evaporator 130. In the present embodiment, The pipe 172 'is disposed in front of the first cooling pipe 131' and the second heat pipe 172 '' is disposed in the rear of the second cooling pipe 131 ' have.

The heat pipe 172 may be configured to be received between a plurality of cooling fins 132 fixed to each end of the cooling pipe 131. According to the structure, the heat pipe 172 is disposed between the respective ends of the cooling pipe 131. At this time, the heat pipe 172 may be configured to contact the cooling fin 132.

However, the present invention is not limited thereto. In one example, the heat pipe 172 may be installed to penetrate the plurality of cooling fins 132. That is, the heat pipe 172 is expanded in a state of being inserted into the insertion hole of the cooling fin 132 and can be firmly fitted into the insertion hole. According to the above structure, the heat pipe 172 is disposed correspondingly to the cooling pipe 131.

4 is an exploded perspective view showing the first embodiment of the heating unit 171 shown in FIG. 6 is a perspective view showing the heater case 171a shown in Fig. 4. Fig. 7 is a perspective view showing the heater case 171a shown in Fig. 6, ) Along the line AA.

Referring to the drawings, the heating unit 171 includes a heater case 171a and a heater 171b.

The heater case 171a has a hollow shape and is connected to both ends of the heat pipe 172 to form a closed loop circulation flow path in which the working fluid F can circulate together with the heat pipe 172 do. That is, both ends of the heat pipe 172 are configured to communicate with each other via the heater case 171a. The heater case 171a may be made of aluminum.

The heater case 171a may be disposed at one side of the evaporator 130 where the accumulator 134 is located, the other side opposite thereto, or any point between the one side and the other side.

The heater case 171a may be disposed adjacent to the lowermost end of the cooling pipe 131. [ For example, the heater case 171a may be disposed at the same height as the lowermost end of the cooling pipe 131, or may be disposed at a position lower than the lowermost end of the cooling pipe 131. [

The heater case 171a is disposed at a position lower than the lowest end of the cooling pipe 131 at one side of the evaporator 130 in which the accumulator 134 is located and in parallel with the evaporator 130 As shown in Fig.

Outlets 171a1 'and 171a1' and inlets 171a2 'and 171a2', respectively, which are respectively connected to both ends of the heat pipe 172 are formed on both sides in the longitudinal direction of the heater case 171a.

Specifically, outlets 171a1 'and 171a1', which communicate with one end portion of the heat pipe 172, are formed at one side (for example, the front end portion of the heater case 171a) of the heater case 171a. 171a1 'and 171a1 "denote the openings through which the working fluid F heated by the heater 171b is discharged to the heat pipe 172. [

An inlet 171a2 ', 171a2 "communicating with the other end of the heat pipe 172 is formed on the other side (for example, the rear end of the heater case 171a) of the heater case 171a. 171a2 "means an opening through which condensed working fluid F passes through the heat pipe 172 to the heater case 171a.

A heater 171b for heating the working fluid F is attached to the outer surface of the heater case 171a. The heater 171b is configured to generate heat when power is supplied, and the working fluid F in the heater case 171a is heated to a high temperature by receiving heat from the heater 171b.

The heater 171b may have a shape elongated along the longitudinal direction of the heater case 171a. As the heater 171b, a plate-shaped heater (for example, a plate-shaped ceramic heater) having a plate shape may be used.

In this embodiment, it is shown that the plate-shaped heater 171b is attached to the bottom surface of the heater case 171a. The structure in which the heater 171b is attached to the bottom surface of the heater case 171a is advantageous in that the upward driving force is generated in the heated working fluid F and the defrost water generated by the defrosting is supplied to the heater 171b so that a shot can be prevented.

A thermally conductive adhesive 171g may be interposed between the heater case 171a and the heater 171b. The thermally conductive adhesive 171g serves to transfer the heat generated by the heater 171b to the heater case 171a while attaching the heater 171b to the heater case 171a. As the thermally conductive adhesive 171g, heat-resistant silicone which can withstand high temperatures can be used.

The activation and deactivation of the heater 171b can be controlled by time, temperature conditions, and the like. In one example, the operation of the heater 171b is controlled by the time condition, and the operation stop of the heater 171b can be controlled by the temperature condition.

Specifically, the control unit stops the operation of the compressor 160 and stops the operation of the power supply unit 175 (see FIG. 11) after a certain period of time after the operation of the compressor 160 constituting the refrigeration cycle with the evaporator 130, (ON). Accordingly, the heater 171b receives power from the power supply unit 175 and generates heat.

The control unit can turn off the operation of the power supply unit 175 when the temperature sensed by the defrost sensor 135 (to be described later) reaches a predetermined defrost termination temperature. Power is not supplied from the power supply unit 175 to the heater 171b so that the active heat generation of the heater 171b is stopped and the temperature is gradually lowered.

The heater 171b may be electrically connected to the power supply unit 175 through a bimetal switch 171h or a fuse. The bimetallic switch 171h or the fuse is configured to electrically connect or disconnect the electrical connections between the heater 171b and the power supply unit 175. [

The bimetallic switch 171h is closed when the temperature is lower than a predetermined temperature so that the heating unit 171 and the power supply unit 175 are electrically connected to each other and the open heating unit 171 and the power supply unit 175 So that the electrical connection between them is cut off.

The fuse is electrically connected to the heating unit 171 and the power supply unit 175 at a temperature lower than a predetermined temperature. At a predetermined temperature or higher, the internal structure melts and the heating unit 171 and the power supply unit 175 mutually So that the electrical connection between them is cut off.

The bimetallic switch 171h can perform its function even if the temperature of the bimetallic switch 171h is lower than a preset temperature. On the other hand, if the fuse is above a predetermined temperature, the internal structure is melted. (That is, even if power is supplied from the power supply unit 175, the heater 171b does not generate heat).

Hereinafter, the bimetallic switch 171h is configured to connect the heater 171b and the power supply unit 175 to each other. It is to be noted that this is for the sake of convenience of description, and it is also included in the present invention that a fuse is provided instead of the bimetal switch 171h.

A defrosting sensor 135 for sensing the temperature for defrosting is provided in the cooling chamber 116 in which the evaporator 130 or the evaporator 130 is disposed. The defrost sensor 135 is preferably disposed at a position suitable for representing the temperature of the evaporator 130. For this purpose, it is preferable that the defrost sensor 135 is located in a portion which is less influenced by the temperature rise by the defrosting device 170 Do.

In this embodiment, it is exemplified that the defrost sensor 135 is mounted on the upper end of the support base 133. [ When the heating unit 171 is disposed adjacent to the one support 133, the defrost sensor 135 can be mounted on the other support 133 farther from the heating unit 171. [

Alternatively, the defrost sensor 135 may be mounted on the inlet side of the cooling pipe 131. The inlet side of the cooling pipe 131 is the lowest temperature portion of the evaporator 130 and is a portion which is less influenced by the temperature rise by the defrosting device 170 and is located at another position that represents the temperature of the evaporator 130 .

The control unit can turn off the power supply unit 175 when the temperature sensed by the defrost sensor 135 reaches a predetermined defrost termination temperature. Power is not supplied from the power supply unit 175 to the heater 171b so that the active heat generation of the heater 171b is stopped and the temperature is gradually lowered.

On the other hand, as the working fluid F filled in the heater case 171a is heated to a high temperature by the heater 171b, the working fluid F flows directionally by the pressure difference. Specifically, the hot working fluid F heated by the heater 171b and discharged to the outlets 171a1 'and 171a1 "flows into the heat pipe 172 and flows along the heat pipe 172 to the evaporator 130 To the cooling pipe 131. The working fluid F is gradually cooled and flows into the inlets 171a2 'and 171a2' through this heat exchange process. The cooled working fluid F is reheated by the heater 171b and then discharged again to the outlets 171a1 'and 171a1', and the above process is repeatedly performed. By this circulation method, .

2 and 3, at least a part of the heat pipe 172 is disposed adjacent to the cooling pipe 131 of the evaporator 130 and is heated by the heating unit 171 to be heated F to transfer the heat to the cooling pipe 131 of the evaporator 130 to remove the sludge.

The heat pipe 172 may have a repetitive bent shape (zigzag shape) such as the cooling pipe 131. To this end, the heat pipe 172 includes an extension portion 172a and a heat dissipation portion 172b.

The extension portion 172a forms a flow path for transferring the working fluid F heated by the heating unit 171 to the upper side of the evaporator 130. [ The extended portion 172a is connected to the outlet 171a1 ', 171a1 "of the heater case 171a provided at the lower portion of the evaporator 130 and the heat dissipating portion 172b provided at the upper portion of the evaporator 130. [

The extension 172a includes a vertical extension extending upwardly of the evaporator 130. [ The vertical extension portion extends to the upper portion of the evaporator 130 while being spaced apart from the supporter 133 on the outer side of the supporter 133 provided at one side of the evaporator 130.

Meanwhile, the extending portion 172a may further include a horizontal extending portion according to a mounting position of the heating unit 171. [ For example, when the heating unit 171 is provided at a position spaced apart from the vertical extension, a horizontal extension for connecting the heating unit 171 and the vertical extension may be additionally provided.

When the horizontally extending portion is connected to the heating unit 171, the hot working fluid F flows through the lower portion of the evaporator 130, so that defrosting of the lower cooling pipe 131 of the evaporator 130 There is an advantage that it can be done smoothly.

The heat dissipating unit 172b is connected to the extension 172a extending to the upper portion of the evaporator 130 and extends in a zigzag shape along the cooling pipe 131 of the evaporator 130. [ The heat dissipating portion 172b is composed of a combination of a plurality of horizontal pipes 172b 'forming upper and lower ends and a connection pipe 172b' 'formed in a U-shaped pipe shape bent in a zigzag fashion.

The extension portion 172a or the heat dissipation portion 172b may extend to a position adjacent to the accumulator 134 in order to remove the property imposed on the accumulator 134. [

As shown in the figure, when the vertical extension part is disposed on one side of the evaporator 130 where the accumulator 134 is located, the vertical extension part extends upward to a position adjacent to the accumulator 134, And may be connected to the heat radiating portion 172b.

On the other hand, when the vertical extension part is disposed on the other side opposite to the one side, the heat dissipating part 172b is horizontally connected to the vertical extension part, then extends upward toward the accumulator 134, 131, respectively.

One end portion of the heat pipe 172 connected to the outlets 171a1 'and 171a1' of the heater case 171a constitutes inflow portions 172c 'and 172c' 'into which the hot working fluid F flows, The other end connected to the inlets 171a2 'and 171a2' of the case 171a constitutes return portions 172d 'and 172d' 'from which the cooled working fluid F is recovered.

In this embodiment, the working fluid F heated by the heater 171b flows into the inlet portions 172c 'and 172c' ', is transferred to the upper portion of the evaporator 130 through the extended portion 172a, The heater 171a is returned to the heater case 171a through the return portions 172d 'and 172d', and then the heater 171b is heated again by the heater 171b And reheated to form a circulating loop that flows through the heat pipe 172. [

In the structure in which the heat pipe 172 is constituted by the first and second heat pipes 172 'and 172' ', the first and second heat pipes 172' and 172 '' are connected to the outlet 171a1 of the heater case 171a ', 171a1' 'and the inlets 171a2' and 171a2 ', respectively.

Specifically, a first outlet 171a1 'and a second outlet 171a1' are formed in parallel at one end of the heater case 171a, and one end of each of the first and second heat pipes 172 'and 172' The operating fluid F in the gaseous state heated by the heating unit 171 is supplied to the first and second outlets 171a1 'and 171a1' 171a1 'and 171a1', respectively, to the first and second heat pipes 172 'and 172' '.

One end of each of the first and second heat pipes 172 'and 172' ', which are connected to the first and second outlets 171a1' and 171a1 ', respectively, is functionally equivalent to the high temperature working fluid heated by the heater 171b F) can be understood as first and second inflow portions 172c ', 172c ".

The first inlet 171a2 'and the second inlet 171a2' are formed in parallel at the other end of the heater case 171a and the other end of each of the first and second heat pipes 172 ' Are connected to the first and second inlets 171a2 'and 171a2', respectively. By the above-described connection structure, the working liquid F in a liquid state, which is cooled while moving the respective heat pipes 172, 2 inlets 171a2 ', 171a2' 'of the heater case 171a.

The other end of the first and second heat pipes 172 'and 172' ', respectively, connected to the first and second inlets 171a2' and 171a2 ' Can be understood as first and second return portions 172d 'and 172d "in which the liquid working fluid (F) is recovered.

On the other hand, since the heating unit 171 is provided in the lower portion of the evaporator 130, the defrost water generated due to the defrosting can flow down to the heating unit 171. Since the heater 171b included in the heating unit 171 is an electronic component, a short circuit may occur when the cleaning water contacts the cleaning water. The heating unit 171 of the present invention may have the following sealing structure in order to prevent the moisture including the defrost water from penetrating into the heater 171b.

A heater 171b is attached to the bottom surface of the heater case 171a and first and second extension pins 171a3 'and 171a3 "extend from the bottom surface to both sides of the heater case 171a So that the defrost water generated by the defrosting falls into the heater case 171a and flows down along the side surface of the heater case 171a, The defrost water is not infiltrated into the heater 171b housed in the inner space between the extension pins 171a3 'and 171a3 ".

An insulating material 171f may be disposed on the back surface of the heater 171b. As the insulating material 171f, a mica sheet made of mica may be used. The heat transfer to the back surface side of the heater 171b (heat transfer to the sealing member 171e to be described later) can be restricted when the heating wire 171b2 generates heat when the power source is applied by disposing the insulating material 171f on the back surface of the heater 171b .

A sealing member 171e for sealing the heater 171b is formed in the recessed space R formed by the back surface of the insulating material 171f and the first and second extension pins 171a3 'and 171a3' Silicone, urethane, epoxy, or the like may be used as the sealing member 171e. For example, when the liquid epoxy is filled in the recessed space R so as to cover the insulating material 171f The first and second extension pins 171a3 'and 171a3' 'may be formed in the recessed space R (see FIG. 17) in which the sealing member 171e is filled, As shown in Fig.

The heater case 171a may be equipped with a top holder 171j and a bottom holder 171k.

The top holder 171j is mounted on the upper side of the heater case 171a and is disposed so as to cover the bimetal switch 171h and the bottom holder 171k is mounted on the lower side of the heater case 171a to heat the heater 171b Respectively. The bottom holder 171k is fastened to the top holder 171j and fixed to the heater case 171a. The top holder 171j may be provided with a receiving portion for receiving the bimetal switch 171h and the bottom holder 171k may be formed with a receiving portion for forming a space for filling the sealing member 171e.

The bimetal switch 171h, the heater 171b, the insulating material 171f, and the sealing member 171e, which are attached to the heater case 171a by the top holder 171j and the bottom holder 171k, Deviation can be prevented.

A filling hole 171k 'for filling the sealing member 171e may be formed in the bottom holder 171k. That is, the sealing member 171e described above may be disposed inside the bottom holder 171k through the filling hole 171k 'of the bottom holder 171k to cover the insulating material 171f.

The top holder 171j and the bottom holder 171k may be formed of a synthetic resin material or a metal material. Further, the top holder 171j and the bottom holder 171k can be coupled to each other through hook coupling. In this figure, hooks 171k "extending upwards on both sides of the bottom holder 171k are provided respectively, and hooking holes 171j 'hooking the hooks 171k" to both right and left sides of the top holder 171j, Respectively.

Hereinafter, a connection structure between the heater case 171a and the heat pipe 172 will be described.

First, the heater case 171a of the present invention has a different structure from that of the heater case 2171a of the defrost device developed in the past. As shown in FIG. 5, one of the defrost devices (unoccupied at the time of filing) developed by the company is connected to both ends 2172c ', 2172c', 2172d 'and 2172d' The heater case 2171a for completing the circulation flow of the main case 2171a1 and the stoppers 2171a2 and 2171a3. The main case 2171a1 has an empty space for filling the working fluid F and a heater is attached to the outer surface of the main case 2171a1 and the caps 2171a2 and 2171a3 are coupled to cover both side openings of the main case 2171a 2172c ", 2172d 'and 2172d "of the heat pipe.

As described above, since the heater case 2171a is composed of the main case 2171a1 and the stoppers 2171a2 and 2171a3, the heater case 2171a has to be machined. Further, when the plugs 2171a2 and 2171a3 are welded to the main case 2171a, a separate jig capable of positioning them at the correct positions was required.

Further, welding between the main case 2171a and the plugs 2171a2 and 2171a3 and between the plugs 2171a2 and 2171a3 and both ends 2172c 'and 2172c', 2172d 'and 2172d' of the heat pipe were required. Particularly, in order to weld between the plugs 2171a2 and 2171a3 and both end portions 2172c ', 2172c', 2172d 'and 2172d' of the heat pipe, the end portions 2172c ', 2172c', 2172d 'and 2172d' (2171a2 ', 2171a2 ") formed in the first and second openings 2171a2 and 2171a3 and the openings 2171a3' and 2171a3" Such a plurality of welding points and connection structures not only make the production process difficult but also lead to an increase in production costs.

However, as shown in FIG. 6, the heater case 171a of the present invention is formed as a single body having the outlets 171a1 'and 171a1' 'and the inlets 171a2' and 171a2 'at both end portions in the longitudinal direction. Internal passages 171a 'and 171a' 'extending from the inlets 171a2' and 171a2 'to the outlets 171a1' and 171a1 'are formed in the heater case 171a. 171a "extend along the longitudinal direction of the heater case 171a and are opened at both ends of the heater case 171a to form the outlets 171a1 'and 171a1" and the inlets 171a2' and 171a2 ", respectively.

172c and 172c and the return portions 172d and 172d of the heat pipe 172 are connected through the outlets 171a1 'and 171a1' and the inlets 171a2 'and 171a2' 171a " are inserted into the inside of the heat pipe 171a and communicate with the internal flow paths 171a 'and 171a ". The internal flow paths 171a' and 171a " (172d ', 172d' '), thereby completing the circulating flow path of the working fluid (F). In order to insert the heat pipe 172, it is preferable that the internal flow paths 171a 'and 171a' 'are formed as circular hollow spaces having a diameter larger than the diameter of the heat pipe 172.

In this way, the heater case 171a is formed as a single body having the outlets 171a1 'and 171a1' and the inlets 171a2 'and 171a2' at both ends thereof, and both ends of the heat pipe 172 are connected to the outlets 171a1 'and 171a1' And the connection between the heater case 171a and the heat pipe 172 is made without the conventional plugs 2171a2 and 2171a3 by having a connection structure in which the heater case 171a is inserted into the heater case 171a through the inlets 171a2 'and 171a2' Structure can be implemented.

Also, since the conventional plugs 2171a2 and 2171a3 are unnecessary, the connection structure eliminates the process for welding the plugs 2171a2 and 2171a3, thereby simplifying the production process.

For reference, in this embodiment, the heat pipe 172 is constituted by first and second heat pipes 172 'and 172' 'formed in two rows, and the heater case 171a is also provided with two outlets 171a1 171a1 "), two inlets 171a2 'and 171a2 ", and two internal passages 171a' and 171a" However, the present invention is not limited thereto. When the heat pipe 172 is formed in a single row, the heater case 171a may have one outlet, one inlet, and one internal flow path.

The heater case 171a may be formed through extrusion molding. Accordingly, the internal passages 171a 'and 171a' 'are continuously formed in the longitudinal direction of the heater case 171a, and the passages 171a2' and 171a2 'and the outlets 171a1' and 171a1 ' Have the same size. In the figure, it is exemplified that the internal flow paths 171a 'and 171a "are formed in a circular shape.

171a2 "and the outlets 171a1 'and 171a1" of the heater case 171a and the outlets 171a1' and 171a1 " The inlet portions 172c 'and 172c' of the heat pipe 172 and the return portions 172d 'and 172d', respectively, which are inserted into the heat pipe 172, are also disposed to face each other.

The internal flow paths 171a 'and 171a' are composed of a first internal flow passage 171a 'and a second internal flow passage 171a', respectively, which correspond to the first heat pipe 172 'and the second heat pipe 172' The first inner flow path 171a 'includes a first outlet 171a1' connected to the inlet 172c 'and the return portion 172d' of the first heat pipe 172 ' And a second outlet 171a1 "connected to the inlet 172c" and the return 172d "of the second heat pipe 172 ". The second outlet 171a1 " And a second inlet 171a2 "extending along the longitudinal direction of the first internal passage 171a 'and the heater case 171a.

The heater case 171a is provided with a working fluid injection port 171a4 for injecting the working fluid F into the internal flow paths 171a 'and 171a ". The working fluid F injected through the working fluid injection port 171a4, 171a "of the heater case 171a, and then filled in the heat pipe 172 by a predetermined amount.

In this embodiment, the working fluid injection port 171a4 is formed so as to communicate with the first and second internal flow paths 171a 'and 171a "on one side of the heater case 171a. Specifically, 171a4 are disposed so as to overlap with the respective portions of the first and second internal flow paths 171a ', 171a "in the thickness direction of the heater case 171a so that the first and second internal flow paths 171a', 171a" A part of the working fluid F injected through the working fluid injection port 171a4 flows into the first inner flow path 171a 'and the other part flows into the second inner flow path 171a' 171a ").

The first and second inner flow paths 171a and 171a are communicated with each other through the working fluid injection port 171a 4. Accordingly, the first and second inner flow paths 171a 'and 171a' A part of the liquid F remains in the vortex forming part in the communicating part. Not all of the heated working fluid F is directly discharged to the outlets 171a1 'and 171a1' but some of them are not discharged directly to the outlets 171a1 'and 171a1', and remain in the heater case 171a , Overheating of the heater 171b can be prevented.

Unlike the present embodiment, the working fluid injection port 171a4 may be constituted by a first working fluid pouring port communicating with the first internal flow path 171a 'and a second working fluid pouring port communicating with the second internal flow path 171a " The first and second working fluid injection ports may be spaced apart from each other and may overlap the first and second internal flow paths 171a 'and 171a "in the thickness direction of the heater case 171a.

According to the above structure, the working fluid F injected through the first working fluid injection port flows into the first internal flow path 171a 'only, and the working fluid F injected through the second working fluid injection port flows into the second inside The circulation flow path including the first internal flow passage 171a 'and the first heat pipe 172' and the second internal flow passage 171a '' and the second heat transfer pipe 171a ' Quot;) can be independently configured.

On the other hand, after the working fluid F is filled through the working fluid inlet 171a4, the working fluid inlet 171a4 is sealed. For the sealing, a sealing member (not shown) may be disposed to cover the working fluid injection port 171a4, and welding may be performed to fill the gap between the sealing member and the heater case 171a.

FIG. 8 is a conceptual diagram showing a connection structure between the heater case 171a and the heat pipe 172 shown in FIG.

The inlet portions 172c 'and 172c' 'of the heat pipe 172 are connected to the internal passages 171a' and 171a '' formed inside the heater case 171a through the outlets 171a1 'and 171a1' And the return portions 172d 'and 172d' 'of the heat pipe 172 are inserted into the internal flow paths 171a' and 171a '' through the inlets 171a2 'and 171a2' '. The inlet portions 172c 'and 172c' and the return portions 172d 'and 172d' of the heat pipe 172 may be arranged to face each other with the internal flow paths 171a 'and 171a' therebetween.

The gap between the heat pipe 172 and the heater case 171a can be filled by welding. Specifically, the first welding portion 171m is formed to fill a gap between the inlet portions 172c 'and 172c' 'and the outlets 171a1' and 171a1 ', and the second welding portion 171n is formed to receive the return portions 172d' and 172d Quot;) and the inlets 171a2 ', 171a2 ".

As shown in the figure, first and second outlets 171a1 'and 171a1 "are formed in parallel at one end of the heater case 171a for connection with the first and second heat pipes 171', 172" The first welded portion 171m covers the gap between the first heat pipe 172 'and the first outlet 171a1' and the gap between the second heat pipe 172 "and the second outlet 171a1" . That is, the first welding portion 171m is made to fill the two gaps at a time.

Likewise, when the first and second inlets 171a2 'and 171a2' are formed in parallel at the other end of the heater case 171a, the second welded portion 171n is connected to the first heat pipe 172 ' The gap between the first heat pipe 171a2 'and the gap between the second heat pipe 172 "and the second inlet 171a2" is formed so as to fill the gap between the two heat pipes 171a2' .

Thus, the gap between the first and second outlets 171a1 'and 171a1' 'formed in parallel and the heat pipes 171' and 172 '' is welded at one time, and the first and second inlets 171a2 ' 171a2 ") and the heat pipes 171 ', 172" at one time, it is possible to further reduce the welding spot, thereby reducing the production cost.

On the other hand, the working fluid injection port 171a4 extends from the inflow portions 172c 'and 172c' 'of the heat pipe 172 inserted through the outlets 171a1' and 171a1 'to the rear side (opposite to the flow of the working fluid F Direction]. At a portion where the first and second internal flow paths 171a 'and 171a "are communicated by the working fluid injection port 171a4, some of the working fluid F is discharged before being discharged through the inflow portions 172c' and 172c" Thereby forming a vortex, thereby preventing overheating of the heater 171b.

FIG. 9 is a cross-sectional view of the heating unit 171 shown in FIG. 8 taken along line B-B, and FIG. 10 is a conceptual view of the heater 171b shown in FIG.

As described above, the heater 171b applied to the heating unit 171 of the present invention may be formed in a plate-like shape, and typically, a plate-shaped ceramic heater 171b may be used.

As shown in Fig. 10, the heater 171b may be configured to include a base plate 171b1, a heat ray 171b2, and a terminal 171b3.

The base plate 171b1 is formed of a ceramic material and is formed in a plate shape elongated along one direction. The base plate 171b1 is attached to the outer surface of the heater case 171a and disposed along the longitudinal direction of the heater case 171a.

A heat ray 171b2 is formed on the base plate 171b1, and the heat ray 171b2 is configured to generate heat when power is applied. The heat ray 171b2 is transmitted between the inlet 171a2 'and the outlet 171a2 "of the heater case 171a and the outlet 171a1', 171a1" of the heater case 171b1 with the base plate 171b1 attached to the outer surface of the heater case 171a And extends from one point toward the outlets 171a1 ', 171a1 ".

The heat ray 171b2 may be formed by patterning a resistor (for example, a powder of ruthenium and platinum combined with tungsten) in a specific pattern on the base plate 171b1. The heat line 171b2 may extend along the longitudinal direction of the base plate 171b1.

The terminal 171b3 is provided at one side of the base plate 171b1 with a terminal 171b3 configured to electrically connect the heating wire 171b2 and the power source and the lead wire 173 electrically connected to the power supply unit 175 ).

9, the heater case 171a is formed so as to correspond to a portion where an active heating part (AHP) corresponding to a part where the heater 171b is disposed and a heater 171b are not arranged Passive heating part (PHP).

The active heat generating portion AHP is a portion directly heated by the heater 171b, and the liquid working fluid F is heated in the active heat generating portion AHP and is phase-changed into a high-temperature gaseous state.

The inlet portions 172c 'and 172c' of the heat pipe 172 are located in the active heat generating portion AHP or in a direction forward (in a direction corresponding to the flow of the working fluid F) to the active heat generating portion AHP In Fig. 9, the heater 171b extends forward beyond the inflow portions 172c 'and 172c ". That is, in this embodiment, the inlet portions 172c 'and 172c' 'of the heat pipe 172 are located in the active heat generating portion AHP.

A passive heat generating portion PHP is formed in the rear of the active heat generating portion AHP (the direction opposite to the flow of the working fluid F). The passive heating part PHP is not directly heated by the heater 171b like the active heating part AHP, but indirectly receives heat and is heated to a certain temperature level. Here, the passive heat generating portion PHP can cause a predetermined temperature rise in the liquid-state working fluid F, but does not have a high enough temperature to phase-change the working fluid F into a gaseous state. That is, from the viewpoint of temperature, the active heat generating portion AHP forms a relatively high temperature portion, and the passive heat generating portion PHP forms a relatively low temperature portion.

If the working fluid F is configured to return directly to the high-temperature active heat generating portion AHP side, there is a case where the recovered working fluid F is heated again and is not smoothly returned to the heater case 171a but flows backward Lt; / RTI > This interferes with the circulating flow of the working fluid F in the heat pipe 172, which may cause a problem that the heater 171b is overheated.

The return portions 172d 'and 172d "of the heat pipes 172 inserted into the inlets 171a2' and 171a2 " communicate with the passive heat generating portion PHP so as to heat the heat pipes 172 So that the returned working fluid F after the movement does not flow directly into the active heat generating portion AHP.

The manual heat generating portion PHP has a direct relation with the formation position of the heat ray 171b2 of the heater 171b. The base plate 171b1 of the heater 171b is connected to the return portion 172d 'of the heat pipe 172 so long as the heat line 171b2 does not extend to the return portions 172d' and 172d ' , 172d " That is, the base plate 171b1 is disposed so as to cover most of the bottom surface of the heater case 171a, and the heat ray 171b2 is formed at a position deviating from the return portions 172d 'and 172d "of the heat pipe 172, The return fluid F returned through the return portions 172d 'and 172d "of the pipe 172 can be prevented from flowing backward.

11 and 12 are conceptual diagrams respectively showing a state where power is connected to the heater 171b by the bimetal switch 171h shown in FIG. 4 and a state where the power connection is cut off.

Referring to FIGS. 4 and 5, the heater 171b is connected to the power supply unit 175 by the bimetal switch 171h. The bimetal switch 171h includes a bimetal having two metal plates of mutually different thermal expansion coefficients bonded to each other. The bimetal switch 171h is configured to perform a switching operation using the characteristic of bimetal bending according to temperature.

The bimetallic switch 171h is connected to the heater 171b and the power supply unit 175 so as to shut off the electrical connection between the heater 171b and the power supply unit 175 at a predetermined temperature or higher. The predetermined temperature may be a temperature in a state where abnormal heat generation of the heater 171b occurs.

That is, the bimetallic switch 171h is configured to maintain the closed state during the normal operation of the heater 171b, and is opened when abnormal heat generation of the heater 171b is performed to prevent further overheating.

The bimetallic switch 171h is closed to energize the heater 171b and the power supply unit 175 until the bimetal switch 171h reaches a predetermined temperature. Accordingly, when the control unit activates the power supply unit 175 (ON), power is supplied to the heater 171b and the heater 171b generates heat.

When the temperature sensed by the defrost sensor 135 reaches the defrost termination temperature, the operation of the power supply unit 175 is turned off and the power supply to the heater 171b is cut off. At this time, The switch 171h has not yet reached the predetermined temperature, so that the bimetallic switch 171h can be kept closed.

However, when abnormal heat generation occurs in the heater 171b, the temperature of the heater 171b suddenly rises rapidly. Here, since the defrost sensor 135 is disposed apart from the heater 171b so that the temperature detected by the defrost sensor 135 can represent the temperature of the evaporator 130, It may take a certain period of time to be detected by the sensor 135.

Therefore, it is necessary to quickly detect the abnormal heat generation of the heater 171b and cut off the power supply to the heater 171b. The bimetal switch 171h provided in the heating unit 171 senses the abnormal heat generation of the heater 171b before the defrosting sensor 135 and blocks the electrical connection between the heater 171b and the power supply unit 175. [

As shown in FIG. 12, when the temperature of the bimetal switch 171h rises to a predetermined temperature or higher due to abnormal heat generation of the heater 171b, the bimetal switch 171h is opened. Thus, the electrical connection between the heater 171b and the power supply unit 175 is cut off, so that the power is not supplied to the heater 171b even if the control unit operates the power supply unit 175. [ Therefore, the heater 171b is no longer heated.

Since the electrical connection between the heater 171h and the power supply unit 175 is cut off when the bimetallic switch 171h is above the predetermined temperature, the heating temperature of the heater 171b is mechanically limited, Can be prevented. Therefore, problems such as shortening of the life of the heater 171b due to overheating and lowering of the efficiency of the evaporator 130 can be solved.

The predetermined temperature may be the temperature of the bimetal switch 171h in a state in which abnormal heat generation of the heater 171b is performed. That is, the bimetal switch 171h may be configured to block the electrical connection between the heater 171b and the power supply unit 175 at the initial stage of abnormal heat generation of the heater 171b, thereby protecting the heater 171b.

A configuration may be considered in which a fuse is provided in place of the bimetallic switch 171h so that the internal configuration of the fuse melts to protect the heater 171b when the heater 171b abnormally generates heat. However, there is a difference in that after the fuse is blown, the electrical connection between the heater 171b and the power supply unit 175 is cut off and the heater 171b can not be re-operated.

However, since the bimetallic switch 171h is configured to open the switch when the temperature of the bimetal is higher than a preset temperature and to close the switch when the temperature becomes lower than the predetermined temperature by using the bending characteristic of the bimetal according to the temperature, Unlike a fuse that can not be removed and functioned again, the heater can be reactivated after it is abnormally heated. Accordingly, the heater 171b can also be reactivated after abnormally heated. Therefore, there is an advantage in terms of the maintenance of the defrost apparatus 170.

The bimetallic switch 171h can be mounted on the heater case 171a. In this figure, the bimetallic switch 171h is attached to the upper surface of the heater case 171a and disposed so as to face the heater 171b attached to the bottom surface of the heater case 171a and the heater case 171a It is showing.

When the bimetallic switch 171h is attached to the heater case 171a on which the heater 171b is mounted, it is possible to more quickly and accurately detect whether the heater 171b is overheated through the heater case 171a have.

The bimetal switch 171h and the heater 171b are electrically connected to each other by wiring (not shown), and the bimetal switch 171h and the heater 171b are connected to the power supply unit 175 So that the defrosting circuit can be constructed. For waterproofing, a waterproof tube (not shown) may be formed to enclose the wires.

13 and 14 are conceptual diagrams showing one example of the bimetal switch 171h shown in FIG. 4. FIG. 13 is a conceptual view showing a closed state of the bimetal switch 171h, FIG. 14 is a conceptual view showing a state in which the bimetal switch 171h is opened FIG.

When the bimetal 171h1 is deformed at a predetermined temperature or more, the bimetal switch 171h of the present embodiment deforms the guide pin 171h2 so that the first and second contact terminals 171h3 and 171h4 The first and second contact terminals 171h3 and 171h4 are electrically disconnected from each other.

Specifically, the bimetal 171h1 is mounted on a frame formed of a synthetic resin material. In this figure, a cover 171h6 is mounted on an upper portion of a base 171h5, a bimetal 171h1 is provided on a recess portion 171h6 'having a recessed shape inward in a cover 171h6, And a portion 171h6 '. A cap 171h7 covering the bimetal 171h1 may be mounted on the cover 171h6.

The first and second terminals 171h8 and 171h9 are mounted on the frame and the first and second terminals 171h8 and 171h9 are respectively connected to the heater 171b and the power supply unit 175 described above. In this figure, the first and second terminals 171h8 and 171h9 are provided on the base 171h5.

Each of the first and second terminals 171h8 and 171h9 is electrically connected to the first and second contact terminals 171h3 and 171h4. In Fig. 13, the first and second contact terminals 171h3 and 171h4 are arranged in contact with the lower side of the cover 171h6, and are electrically connected to each other by a fastening member 171h10 mounted on the base 171h5 Is connected.

The bimetal 171h1 is deformed toward the lower side, that is, toward the recess portion 171h6 'at a predetermined temperature or higher. A guide pin 171h2 is mounted on the bimetal 171h1 so as to pass through the cover 171h6. The guide pin 171h2 is configured to be movable inward and outward when the bimetal 171h1 is deformed. That is, when the bimetal 171h1 is deformed at a predetermined temperature or more, the guide pin 171h2 is moved downward by the deformation, and when the temperature falls below a preset temperature, the bimetal 171h1 is restored, And is moved upward by the restoration.

14, one of the first and second contact terminals 171h3 and 171h4, which were in contact with each other at the lower portion of the guide pin 171h2 when the guide pin 171h2 is moved downward, is inserted into the guide pin 171h2 And is pushed back. Accordingly, the first and second contact terminals 171h3 and 171h4 are separated from each other. As a result, the electrical connection between the heater 171b and the power supply unit 175 is cut off.

However, as shown in FIG. 13, when the bimetal 171h1 falls below a predetermined temperature, the bimetal 171h1 is moved upward and restored to its initial position, so that the guide pin 171h2 is also moved upward . At this time, the contact terminal 171h3, which is pushed by the guide pin 171h2, is moved upward by the elastic restoring force and comes into contact with the corresponding contact terminal 171h4.

In this way, the bimetallic switch 171h is opened at a predetermined temperature or higher and then repeatedly closed when the temperature is lower than a predetermined temperature. That is, once the bimetallic switch 171h has performed its function, it can perform its function permanently, unlike a fuse that needs to be replaced.

In this example, a disc-shaped bimetal switch is shown as an example of the bimetal switch 171h, but the present invention is not necessarily limited thereto. The bimetallic switch 171h may have various shapes such as a plate shape.

Figs. 15 and 16 are conceptual diagrams for explaining the circulation of the working fluid F in the pre-operation and post-operation states of the heater 171b.

15, before the operation of the heater 171b, the working fluid F is in a liquid state, and is heated up to a predetermined level on the basis of the lower end of the heat pipe 172. [ For example, in this state, the working fluid F can be filled up to the lower two ends of the heat pipe 172.

When the heater 171b operates, the working fluid F in the heater case 171a is heated by the heater 171b. 16, the working fluid F heated to the high temperature gaseous state F1 flows into the inlet portions 172c 'and 172c' 'of the heat pipe 172 and flows through the heat pipe 172, The working fluid F flows into the state F2 in which the liquid and the gas coexist while the heat is lost in the heat dissipation process and finally flows into the state F2 of the heat pipe 172 in the liquid state F3, And then flows into the heating unit 171 through the return units 172d 'and 172d' '. The operating fluid F flowing into the heating unit 171 is reheated by the heater 171b to repeat the flow as described above. In this process, heat is transferred to the evaporator 130, 130 are removed.

Since the working fluid F flows due to the pressure difference generated by the heating unit 171 and circulates the heat pipe 172 quickly, the entire area of the heat pipe 172 reaches a stable operating temperature within a short time So that defrosting can be done quickly.

On the other hand, the working fluid F flowing into the inlet portions 172c 'and 172c "has the highest temperature in the circulation process of the heat pipe 172 in the high temperature gas state F1. By using convection of heat by the working fluid F placed on the evaporator F1, it is possible to more effectively remove the property imposed on the evaporator 130. [

For example, the inflow portions 172c 'and 172c' 'may be disposed at a position relatively lower or at the same position as the lowermost end of the cooling pipe 131 provided in the evaporator 130. According to this, Not only the hot working fluid F flowing through the cooling pipes 131a, 132b, 172c ', 172c' 'conveys heat near the lowest end of the cooling pipe 131, ). ≪ / RTI >

On the other hand, in order for the working fluid F to make such a phase change and circulate through the heat pipe 172, the working fluid F must be filled in the heat pipe 172 in a proper amount.

As a result of the experiment, when the working fluid F is filled with less than 30% of the total internal volume of the heat pipe 172 and the heater case 171a, the temperature of the heating unit 171 increases sharply over time . This means that the working fluid F is insufficient relative to the total internal volume of the heat pipe 172 and the heater case 171a.

Further, when the working fluid F is filled in excess of 40% of the total internal volume of the heat pipe 172 and the heater case 171a, the temperature of some ends of the heat pipe 172 reaches the stable operating temperature 50 [ (Frozen condition)] could not be reached. This temperature drop becomes noticeable as the heat pipe 172 approaches the return portions 172d 'and 172d'. This is because the operating fluid F is excessively larger than the total volume of the heat pipe 172 and the heater case 171a It means that the interval in which the working fluid F flows into the liquid state is increased.

The temperature of the heating unit 171 and the temperature of each end of the heat pipe 172 are set to be equal to or more than 30% and not more than 40% of the total internal volume of the heat pipe 172 and the heater case 171a, It was confirmed that the temperature reached a stable operating temperature over time.

At this time, the temperature of each end of the heat pipe 172 is higher as the temperature is closer to the inlet portions 172c 'and 172c ", and the temperature is lower as it is closer to the return portions 172d' and 172d" appear. As the amount of the filled working fluid F decreases, the difference between the temperature (maximum temperature) at the inlet portions 172c 'and 172c' 'and the temperature (lowest temperature) at the return portions 172d' and 172d ' .

Therefore, the working fluid F is filled in the amount of 30% or more and 40% or less of the total internal volume of the heat pipe 172 and the heater case 171a. However, depending on the heat transfer structure and stability of the defroster 170, The filling amount of the working fluid F optimized for each device 170 can be selected.

17 and 18 are a front view and a perspective view showing a second embodiment 1170 of the defrost apparatus applied to the refrigerator 100 of FIG.

17 and 18, the heating unit 1171 may be disposed at one side of the defrost apparatus 1170. The heater case 1171a may be located outside the support 1133 provided at one side of the evaporator 1130 and extend vertically upward from the lower side of the evaporator 1130. [ At this time, at least a part of the heater case 1171a may be disposed between the first cooling pipe 1131 'and the second cooling pipe 1131 ".

The heater case 1171a is connected to the heat pipe 1172 to form a circulating flow path through which the working fluid F can circulate. For this purpose, an outlet 1171a1 and an inlet 1171a2 are formed on the upper and lower sides of the heater case 1171a, respectively. The outlet 1171a1 is connected to the extension 1172a of the heat pipe 1172 and the inlet 1171a2 is connected to the lowest end of the heat dissipation portion 1172b of the heat pipe 1172. [

The heater 1171b includes a plate heater 1171b extending in one direction and is attached to the outer surface of the heater case 1171a and disposed vertically in the vertical direction of the evaporator 1130. [ 17, the heating unit 1171 is schematically shown as only a heater case 1171a, a heater 1171b, a bimetal switch 1171h, a first holder 1171j and a second holder 171k for convenience of explanation. Respectively. It is needless to say that the heating unit 1171 may have the above-described detailed structure (the first and second extension pins 171a3 'and 171a3', the sealing member 171e, etc.).

In this embodiment, the heater 1171b is attached to the outer surface of the heater case 1171a facing outward. According to the above arrangement, it is possible to prevent a certain level of contact between the defrost water generated by defrosting and the heater 1171b.

However, the present invention is not limited thereto. The heater 1171b may also be attached to the inner surface of the heater case 1171a facing the support table 133. [ However, in this case, it is preferable that a structure capable of preventing contact between the heater 1171b and the defrost water is provided.

In the present embodiment, the bimetallic switch 1171h is attached to the outer surface of the heater case 1171a facing the inside of the evaporator 1130, and arranged so as to face the heater 1171b with the heater case 1171a therebetween . However, the present invention is not limited thereto. The bimetallic switch 1171h may be attached to one of both sides of the heater case 1171a exposed toward the front or rear of the evaporator 1130. [

The heater 1171b extends from the inlet 1171a2 and the outlet 1171a1 toward the outlet 1171a1 and is made to reheat the working fluid F recovered through the inlet 1171a2. The terminal of the heater 1171b may be formed at the end of the heater 1171b positioned between the inlet 1171a2 and the outlet 1171a1 and the lead wire 1173 is connected to the terminal and is directed toward the lower side of the evaporator 1130 .

On the other hand, the working fluid F is preferably filled higher than the uppermost end of the heater 1171b extending in the vertical direction inside the heater case 1171a. With this configuration, defrosting operation can be performed safely in a state in which the heating unit 1171 is not overheated, and continuous supply of the working fluid F in a gaseous state to the heat pipe 1172 can be stably performed.

19 is an exploded perspective view showing a second embodiment of the heating unit 171 shown in Fig. 3, Fig. 20 is a perspective view showing the heater case 271a shown in Fig. 19, Fig. 21 is a cross- And is a front view of the heater case 271a.

In this embodiment, the heater case 271a has a deformed structure. Therefore, except for the connection structure between the heater case 271a and the first and second heat pipes, the description of the first embodiment described above can be equally applied. Therefore, a repetitive description related thereto will be omitted.

The heater case 271a has a chamber 271a 'inside and has a first outlet 271a1' and a second outlet 271a1 "communicating with the chamber 271a 'at one end thereof, A first inlet 271a2 'and a second inlet 271a2' communicating with the chamber 271a 'are formed. The first and second outlets 271a1 'and 271a1 "denote the openings through which the working fluid F heated by the heater 271b is discharged to the first and second heat pipes, and the first and second outlets 271a1' 271a2 'and 271a2' denote the openings through which the working fluid F condensed while passing through the first and second heat pipes is recovered to the heater case 271a.

A first joint portion 271a5 'is formed between the first outlet 271a1' and the second outlet 271a1 "and has an upper surface and a lower surface connected to each other. A first joint 271a5 'is formed between the first inlet 271a2' and the second inlet 271a2" The first and second joint portions 271a5 'and 271a5' 'are formed by a pressing process for pressing the upper and lower portions of the heater case 271a .

As shown in the figure, a first outlet 271a1 'and a second outlet 271a1' are formed on both sides of the first joint 271a5 'by the first joint 271a5' ", A first inlet 271a2 'and a second inlet 271a2" are formed on both sides of the second joint portion 271a5 ".

The upper surface and the lower surface 271a6 of the heater case 271a between the first and second joints 271a5 'and 271a5 "are formed to be flat. A heater 271b is attached to the flat upper or lower surface 271a6, The corresponding internal space forms a chamber 271a 'A chamber 271a' connects the working fluid F by connecting them between the inlet portions 272c 'and 272c' 'and the return portions 272d' and 272d ' Thereby completing the circulating flow path of FIG.

Specifically, both end portions of the first heat pipe (i.e., the inlet portion 272c 'and the return portion 272d') are connected to the heater case 271a through the first outlet 271a1 'and the first inlet 271a2' And is communicated with the chamber 271a '. Both ends of the second heat pipe (i.e., the inlet 272c " and the return 272d ") are connected to the inside of the heater case 271a through the second outlet 271a1" and the second inlet 271a2 " And is communicated with the chamber 271a '.

It is preferable that the first and second outlets 271a1 'and 271a1 "have a larger diameter than the diameter of the inflow portions 272c', 272c" for inserting the inflow portions 272c ', 272c " The first and second inlets 271a2 'and 271a2' 'preferably have a larger diameter than the diameter of the return portions 272d' and 272d '' for insertion of the return portions 272d 'and 272d' '.

272d "and 272d" of each of the first and second heat pipes are configured to communicate with each other through the heater case 271a by the connection structure so that the working fluid F is circulated A circulating flow path in the form of a closed loop is formed. Here, the working fluid F which has flowed through each of the first and second heat pipes is mixed in the chamber 271a 'and redistributed to each of the first and second heat pipes.

As described above, the heater case 271a is formed as a single body having the first and second outlets 271a1 'and 271a1' formed at one end thereof and the first and second inlets 271a2 'and 271a2' formed at the other end thereof 272d ', 272d "of the first and second heat pipes are connected to the first and second outlets 271a1', 271a1" and the first and second inlets 271a2 ', 271a2 " The connecting structure between the heater case 271a and the first and second heat pipes can be realized without the conventional plugs 2171a2 and 2171a3 by having a connection structure that is inserted into the inside of the heater case 271a through the through- .

Also, since the conventional plugs 2171a2 and 2171a3 are unnecessary, the connection structure eliminates the process for welding the plugs 2171a2 and 2171a3, thereby simplifying the production process.

For reference, in the present embodiment, the heat pipe is constituted by first and second heat pipes forming two rows, and the heater case 271a is also provided with two outlets 271a1 'and 271a1' 271a2 ', 271a2 ") are formed. However, the present invention is not limited thereto. When the heat pipe is formed in a single row, one outlet and one inlet may be formed in the heater case 271a.

As described above, the heater 271b for heating the working fluid F is provided on the flat upper or lower surface 271a6 of the heater case 271a formed between the first and second junctions 271a5 'and 271a5' The working fluid F filled in the chamber 271a 'is heated by a heater 271b which receives heat and is heated to a high temperature. The heater 271b is formed to generate heat when power is supplied. (In the form of a plate-like ceramic heater) having a plate shape can be used as the plate 271b. In this embodiment, a plate-like heater 271b is disposed on the flat bottom surface (bottom surface, 271a6).

The heater case 271a is provided with a working fluid injection port 271a4 for injecting the working fluid F into the chamber 271a '. The working fluid F injected through the working fluid inlet 271a4 is filled in the chamber 271a 'of the heater case 271a and then filled in the first and second heat pipes. In this embodiment, it is illustrated that the working liquid injection port 271a4 is formed on the side surface of the heater case 271a.

On the other hand, after the working fluid F is filled through the working fluid inlet 271a4, the working fluid inlet 271a4 is sealed. For the sealing, a sealing member (not shown) may be disposed to cover the working liquid injection port 271a4, and welding may be performed to fill the gap between the sealing member and the heater case 271a.

22 is a conceptual view showing a manufacturing method of the heater case 271a shown in Fig.

Referring to FIG. 22, in order to manufacture the heater case 271a of the present embodiment, a heater case 271a having open ends at both ends is prepared. The heater case 271a may be formed of an aluminum material, and may be formed in the shape through extrusion molding. In this figure, it is shown that a heater case 271a having an elliptical empty space is prepared.

Next, a press process is performed to press the middle portion of the one end of the heater case 271a and the middle portion of the other end. The press process is performed by disposing the upper press die 10 and the lower press die 20 at the upper and lower portions of the prepared heater case 271a and by disposing the upper press die 10 and the lower press die 20 close to each other So that the process can be performed. At this time, the pressing portions 11 and 21 formed on the upper press die 10 and the lower press die 20 join the upper surface and the lower surface of the heater case 271a to the first and second joint portions 271a5 'and 271a5' .

The upper surface and the lower surface of the heater case 271a are joined by the pressing process, and a hollow space is formed on both sides of the pressed center portion. The empty space functions as the first and second outlets 271a1 'and 271a1' 'or the first and second inlets 271a2' and 271a2 'according to the connection structure with the first and second heat pipes.

Specifically, if the empty spaces on both sides of the first joint portion 271a5 'formed at one end of the heater case 271a are connected to the inlet portions 272c' and 272c '' of the first and second heat pipes, And serve as the first and second outlets 271a1 'and 271a1 ". In this case, the empty spaces on both sides of the second joint portion 271a5 "formed at the other end of the heater case become the first and second inlets 271a2 'and 271a2 ", and the return portions 272d ', 272d' ').

As described above, both end portions 272c 'and 272d' of the first heat pipe are inserted into the inside of the heater case 271a through the first outlet 271a1 'and the first inlet 271a2' 272d "are inserted into the heater case 271a through the second outlet 271a1" and the second inlet 271a2 "to constitute a connection structure for circulating the working fluid F .

Next, welding is performed to fill the gap generated in the connection structure. Since the first and second outlets 271a1 'and 271a1 "are formed in parallel to each other, the welding that fills the gap between the first and second heat pipes and the first and second outlets 271a1' and 271a1" . The first welding portion 271m (see FIG. 23) formed by the welding is formed to fill the gap between the upper surface and the lower surface of the heater case 271a forming the first joint portion 271a5 'in the welding process.

Similarly, since the first and second inlets 271a2 'and 271a2 "are formed in parallel, the welding that fills the gap between the first and second heat pipes and the first and second inlets 271a2' and 271a2" . The second welding portion 271n (see Fig. 23) formed by the welding is formed to fill the gap between the upper surface and the lower surface of the heater case 271a forming the second joint portion 271a5 "in the welding process.

Thereafter, the working fluid F is injected through the working fluid injection port 271a4 formed in the heater case 271a. After a certain amount of the working fluid F is injected, the working fluid injection port F is sealed.

23 is a conceptual view showing a connection structure between the heater case 271a shown in FIG. 19 and the first and second heat pipes.

23, the inlet portions 272c 'and 272c' 'of the first and second heat pipes are inserted into the heater case 271a through the first and second outlets 271a1' and 271a1 ' The return portions 272d 'and 272d' 'of the first and second heat pipes are inserted into the heater case 271a through the first and second inlets 271a2' and 271a2 ''. The inlet portions 272c 'and 272c' 'and the return portions 272d' and 272d 'of the first and second heat pipes may be arranged to face each other with the chamber 271a' therebetween.

The gap between the first and second heat pipes and the heater case 271a can be filled by welding. Specifically, the first welded portion 271m is formed to fill the gap between the inlet portions 272c 'and 272c' 'and the first and second outlets 271a1' and 271a1 ', and the second welded portion 271n is formed so as to fill the gap between the return portion 271c' 272d "and the first and second inlets 271a2 ', 271a2 ".

As shown in the figure, when the first and second outlets 271a1 'and 271a1 "are formed in parallel at one end of the heater case 271a for connection to the first and second heat pipes, (271m) is formed to fill the gap between the first heat pipe and the first outlet (271a1 ') and the gap between the second heat pipe and the second outlet (271a1 "). That is, the first welding portion 271m is made to fill the two gaps at a time.

Similarly, when the first and second inlets 271a2 'and 271a2' are formed in parallel at the other end of the heater case 271a, the second welded portion 271n is connected to the first heat pipe and the first inlet 271a2 ' And the gap between the second heat pipe and the second inlet 271a2 ". That is, the second welded portion 271n is made to fill the two gaps at a time.

In this way, the gap between the first and second outlets 271a1 'and 271a1 "formed in parallel and the first and second heat pipes are welded at one time, and the first and second inlets 271a2' and 271a2 ' ) And the first and second heat pipes are welded at one time, the welding point can be further reduced, and the production cost can be reduced accordingly.

The heater case 271a includes an active heating part (AHP) corresponding to a portion where the heater 271b is disposed and a passive heating part (PHP) corresponding to a part where the heater 271b is not disposed. Part.

The active heat generating portion AHP is a portion directly heated by the heater 271b, and the liquid working fluid F is heated in the active heat generating portion AHP and is phase-changed into a high temperature gaseous state.

The inlet portions 272c 'and 272c "of the first and second heat pipes are located in the active heat generating portion AHP or in front of the active heat generating portion AHP (the direction corresponding to the flow of the working fluid F) In this embodiment, the heater 271b is attached to the flat bottom surface 271a6 between the first and second joints 271a5 'and 271a5', and the inflow portions 272c 'and 272c' The inlet portions 272c 'and 272c' 'of the first and second heat pipes are positioned in front of the active heat generating portion AHP in this embodiment.

A passive heat generating portion PHP is formed in the rear of the active heat generating portion AHP (the direction opposite to the flow of the working fluid F). The passive heating part PHP is not directly heated by the heater 271b like the active heating part AHP, but indirectly receives heat and is heated to a certain temperature level. Here, the passive heat generating portion PHP can cause a predetermined temperature rise in the liquid-state working fluid F, but does not have a high enough temperature to phase-change the working fluid F into a gaseous state. That is, from the viewpoint of temperature, the active heat generating portion AHP forms a relatively high temperature portion, and the passive heat generating portion PHP forms a relatively low temperature portion.

If the working fluid F is configured to be returned to the high-temperature active heat generating portion AHP side, the recovered working fluid F may not be returned to the heater case 271a again and flow back Lt; / RTI > This interferes with the circulating flow of the working fluid F in the first and second heat pipes, and may cause a problem that the heater 271b is overheated.

In order to solve this problem, the return portions 272d 'and 272d "of the first and second heat pipes inserted into the first and second inlets 271a2' and 271a2" are communicated with the passive heat generating portion PHP , And the returned working fluid (F) after moving the first and second heat pipes does not flow directly into the active heat generating unit (AHP).

Claims (15)

A heating unit provided in the evaporator; And
At least a part of which is connected to the inlet and the outlet of the heating unit, and a heat pipe which is disposed adjacent to the cooling pipe so as to radiate heat to the cooling pipe of the evaporator by the hot working liquid, / RTI >
The heating unit includes:
A heater case having an inlet and an outlet formed at both ends thereof and formed with a single body; And
And a heater attached to the outer surface of the heater case to heat the working fluid in the heater case,
Wherein both ends of the heat pipe are inserted into the heater case through the inlet and the outlet, and communicate with the internal flow path. The method according to claim 1,
And the internal flow path extends along the longitudinal direction of the heater case. The method according to claim 1,
The heating unit includes:
A first welding portion formed to fill a gap between the heat pipe and the outlet; And
Further comprising a second welded portion formed to fill a gap between the heat pipe and the inlet. The method according to claim 1,
Wherein the heat pipe includes a first heat pipe and a second heat pipe respectively disposed on a front portion and a rear portion of the evaporator,
The internal passage
A first inner flow path having a first inlet and a first outlet connected to both ends of the first heat pipe; And
And a second internal flow path having a second inlet and a second outlet connected to both ends of the second heat pipe and extending in parallel with the first internal flow path. 5. The method of claim 4,
Wherein the heater case is provided with a working fluid injection port formed on one surface of the heater case to communicate with the first and second inner flow paths for injecting the working fluid. 6. The method of claim 5,
Wherein the actuating fluid injection port is arranged to overlap each part of the first and second internal flow paths in the thickness direction of the heater case so that the first and second internal flow paths communicate with each other. The method according to claim 6,
Wherein the actuating fluid injection port is formed at a position spaced from the one end of the heat pipe inserted into the heater case through the outlet to the inlet side. The method according to claim 1,
Wherein the heater is a plate-shaped ceramic heater attached to an outer surface of the heater case. 9. The method of claim 8,
Wherein the heater case is partitioned into an active heat generating portion corresponding to a portion where the heater is disposed and a passive heat generating portion corresponding to a portion where the heater is not disposed,
Wherein one end of the heat pipe inserted into the inlet communicates with the manual heat generating portion so as to prevent the working fluid returned through the inlet from reheating and flowing backward. The method according to claim 1,
Wherein the heater case includes first and second extension pins formed on both sides of the heater case, the first and second extension pins extending from the outer surface to the outer surface and covering both sides of the heater attached to the outer surface. 11. The method of claim 10,
An insulating material is disposed on the back surface of the heater,
And a sealing member is filled in the recessed space formed by the back surface of the insulating material and the first and second extension pins. The method according to claim 1,
The heating unit includes:
And a bimetal switch attached to the heater case for blocking an electrical connection between the heater and the power supply unit at a predetermined temperature or higher and electrically connecting the heater and the power supply unit at a temperature lower than a predetermined temperature And the defrosting device. Refrigerator body;
An evaporator installed in the refrigerator body and configured to cool the fluid by depriving surrounding evaporation heat; And
The refrigerator as claimed in any one of claims 1 to 12, wherein the defrosting device is configured to remove the property generated in the evaporator. A heater case having a first outlet and a second outlet formed at one end thereof and having a first inlet and a second inlet formed at one end;
A first heat pipe which is inserted into the first inlet and the first outlet and whose both ends communicate with a first internal flow path connecting the first inlet and the first outlet;
A second heat pipe inserted into the second inlet and the second outlet, respectively, and communicating with a second internal flow path connecting the second inlet and the second outlet;
A heater attached to one surface of the heater case and configured to heat a working fluid in the heater case;
A first weld to fill a gap between the first and second heat pipes and the first and second outlets; And
And a second weld portion that fills a gap between the first and second heat pipes and the first and second openings. 15. The method of claim 14,
Wherein the heater case is provided with a working liquid injection port communicated with the first and second internal flow paths on the other surface of the heater case for injecting the working liquid.

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