Patent Publication Number: US-8991205-B2

Title: Refrigerator door

Description:
This application is a divisional of prior U.S. patent application Ser. No. 12/401,827 filed Mar. 11, 2009, which is a divisional of prior U.S. patent application Ser. No. 11/526,088 filed Sep. 25, 2006, now U.S. Pat. No. 7,908,882, which claims the benefit of the Korean Patent Applications Nos. 10-2005-0088914 filed in Korea on Sep. 23, 2005, 10-2005-0109425 filed in Korea on Nov. 16, 2005, 10-2005-0127516 filed in Korea on Dec. 22, 2005 and 10-2005-0134683 filed in Korea on Dec. 30, 2005, which are hereby incorporated by reference as if fully set forth herein. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a refrigerator, and more particularly, to a refrigerator door. Although the present invention is suitable for a wide scope of applications, it is particularly suitable for facilitating an icemaker unit to be installed to prevent water from splashed on the refrigerator door, filing the door with a foaming liquid and enabling cold air of a refrigerator to flow to an ice-making room without leaking. 
     2. Discussion of the Related Art 
     Generally, a refrigerator is a device for storing food at low temperature. And, the refrigerator is a home appliance storing food in a manner of freezing or cooling the food according to its state. Moreover, consumers tend to be interested in large-scale and multi-functional refrigerators to enhance the high standard of living and meet their various tastes. 
     Recently, a refrigerator is provided with various convenience devices and its internal configuration tends to be diversified to fit a user&#39;s taste and use. 
     A refrigerator according to the present invention is applicable to refrigerators having diverse configurations. In the following description, a bottom freezer type refrigerator among various type refrigerators will be explained for example. In this case, a body the bottom freezer type refrigerator is partitioned into an upper part and a lower part to be provided with a cold storage room and a freezer room, respectively. 
       FIG. 1  is a front diagram of a refrigerator according to a related art. 
     Referring to  FIG. 1 , a body of a refrigerator  1  approximately has a rectangular box shape. An internal space of the body  1  is partitioned into an upper part and a lower part to configure a cold storage room  10  and a freezer room  12 . 
     A refrigerator door  20  is provided to an open front side of the body  1 . The refrigerator door  20  is to selectively close or open the open front side of the cold storage room  10  or the freezer room  12 . And, the refrigerator door  20  consists of a cold storage room door  22  and a freezer room door  28 . 
     The cold storage room door  22  is to selectively open/close the cold storage room  10  provided to the upper part of the body  1 . In case of a side-by-side type refrigerator, the cold storage room door  22  is provided to both right and left sides. The cold storage room door  22  is configured to rotate centering on a corresponding side end. So, the cold storage room door  22  is able to selectively open/close the cold storage room  10 . 
     And, the freezer room door  28  is to selectively open/close the freezer room  12  provided to the lower part of the body  1 . The freezer room door  28  has a draw type configuration enabling back-and-forth sliding input/output. So, the freezer room door  28  is able to selectively open/close the freezer room  20 . 
     Meanwhile, a dispenser  30  is provided to one of the right and left side cold storage room doors  22  to open/close the cold storage room  10 . The dispenser  30  facilitates purified water or ice to be taken out of the refrigerator without opening the cold storage room door  22 . And, the dispenser  30  is provided to a front side of the cold storage room door  22  to be externally exposed. 
       FIG. 2  is a perspective diagram of a refrigerator door according to a related art, in which an icemaker  42  provided to a backside of the refrigerator door is shown. 
     Referring to  FIG. 2 , an ice making room  40  is provided to a backside of a door  20  provided with a dispenser  30 . And, an icemaker  42  is provided within the ice making room  40  to make ice. 
     The ice making room  40  is configured with a recessed part o an inner case  24  forming the backside of the door  22 . And, the ice making room  40  is selectively opened/closed by an ice making room door  48  rotatably provided to its side. 
     An icemaker  42  making ice, an ice bank  44  storing the ice and a transfer means  46  for supplying the stored ice to a discharge part (cf.  1 )  32  of the dispenser  30  are provided within the ice making room  40 . And, they are directly attached to the inner lateral side of the ice making room  40 , i.e., the inner case  24 . 
       FIG. 3  is a perspective diagram of a refrigerator door according to a related art, in which an inner configuration of the refrigerator is shown. 
     Referring to  FIG. 3 , a refrigerator door consists of an outer case  26  forming an exterior of the refrigerator door and an inner case  24  provided within the outer case to form a backside of the door. 
     And, a dispenser case  34  forming a shape of an inside of the dispenser  30  is attached to the inside of the outer case  26 . 
     A tube guide  50  is provided below the dispenser case  34 . The tube guide  50  is connected to the dispenser  30  to support a water supply tube  52  via which water flows. And, the tube guide  50  is fixed to a backside of the outer case  26  to enable the water supply tube  52  to keep a predetermined distance. 
     Meanwhile, for the assembly of the cold storage room door  22 , the water supply tube  52 , the dispenser  30  and the like are provided to the outer case  26  and the tube guide  50  is installed to adhere closely to the backside of the outer case  26 . 
     After the inner case  24  forming the backside of the cold storage room  22  has been assembled to the outer case  26 , an inside of the cold storage room door  22 , i.e., a space between the outer case  26  and the inner case  24  is charged with a foaming liquid for insulation. 
     Finally, the icemaker  42 , the ice bank  44  and the transfer means  46  are installed in the ice making room  40  of the inner case  24 . 
     However, the related art has the following problems. 
     First of all, the tube guide  50 , as shown in  FIG. 2 , is installed to adhere closely to the backside of the outer case  26 . If the cold storage room door  22  is charged with the foaming liquid, a flow of the foaming liquid is interrupted by the tube guide  50 . So, if is difficult to fill a position in the vicinity of the tube guide  50 , a corner part or the like with the foaming liquid. If the insufficient filling of the foaming liquid takes place, insulation efficiency of the cold storage room door  22  is lowered to reduce cooling performance of the refrigerator and raise power consumption. So, overall performance of the refrigerator is degraded. 
     Secondly, the icemaker  42  is directly provided to the inner case  24  of the ice making room  40 . Since rigidity of the inner case  24  is relatively weak, the inner case  24  is unable to avoid drooping or transformation in case that the icemaker  42  is directly assembled to the inner case  24 . In particular, in case that the icemaker  42  is directly assembled to the inner case  24  without a separate support structure, a malfunction in detaching the icemaker  42  or taking ice takes place as well as the transformation of the inner case  24 . 
     Thirdly, the icemaker  42  is provided to the inside of the cold storage room door  22 . As a user opens or closes the cold storage room door, unfrozen water held by the icemaker  42  is splashed in all directions due to a centrifugal force generated from the rotation of the door. In particular, in the water in the icemaker  42  is splashed, the splashed water is unable to enter the icemaker  42  again but flows downward. So, the flowing water becomes frozen on another part except the icemaker  42  to interrupt operations of parts configuring the icemaker  42 . 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention is directed to a refrigerator door that substantially obviates one or more problems due to limitations and disadvantages of the related art. 
     An object of the present invention is to provide a refrigerator door, by which an inside of a cold storage room door can be evenly filled up with a foaming liquid. 
     Another object of the present invention is to provide a refrigerator door, by which transformation and breakage of an inner case can be prevented in case of foxing an ice making unit. 
     A further object of the present invention is to provide a refrigerator door, by which water splashed from the ice making unit can renter the ice making unit if a user opens or closes the refrigerator door. 
     Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. 
     To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a refrigerator door according to the present invention includes an outer case forming a shape of the refrigerator door, an inner case provided within the outer case to configure a backside of the refrigerator door wherein a space between the inner case and the outer case is charged with a foaming liquid, an ice making unit provided to one side of the inner case to make ice, a fixing unit provided to the space charged with the foaming liquid between the inner case and the outer case and fixing the ice making unit to the refrigerator door, a dispenser provided to one side of the outer case to discharge the ice supplied by the ice making unit. 
     Preferably, the refrigerator door further includes a water supply tube connected to the dispenser and supplying the water with the dispenser to discharge the water at the dispenser. 
     Preferably, the refrigerator door further includes an auxiliary tank provided to the space between the inner case and the outer case to store the water supplied to the dispenser. And, the water supply tube is connected to the dispenser via the auxiliary tank. 
     Preferably, the tube guide is formed of a same material of the foaming liquid. 
     Preferably, a plurality of spacing members are projected from a backside of the tube guide. 
     More particularly, a plurality of the spacing members are provided along a circumference of a lower surface of the tube guide. More preferably, a plurality of the spacing members have panel shapes with prescribed lengths, respectively and differ from each other in width. 
     Preferably, the ice making unit includes a splash-preventing means for preventing water to make the ice from being splashed if the refrigerator door is rotated. 
     Preferably, the ice making unit includes an ice making receptacle having an ice making space for holding the water to make the ice, an assembling part extending from one side of the ice making receptacle to be fixed to the fixing unit, an ice transferring lever revolving to externally draw the ice made in the ice making receptacle, and a drive unit provided to one side of the ice making receptacle to have a motor driving the ice transferring lever and a case accommodating the motor. And, the splash-preventing means includes a guide part recessed with a prescribed depth into one side of the case of the drive unit in the vicinity of the ice making receptacle. 
     More preferably, the guide part is recessed into the one side of the case to have a downwardly tapering shape. More preferably, a circumference of the guide part is configured to have a shape of a looped curve. 
     More preferably, the guide par is provided to the one side of the case to have a shape of a rotor blade. 
     More preferably, the ice transferring lever is rotatably connected to a loading boss provided to the case and the guide part is configured to have a shape tapering toward the loading boss. 
     More preferably, the fixing unit includes a supporter fixed to the space between the outer case and the inner case and a supporter holder assembled to one side of the supporter to be connected to the assembling part of the ice making unit by a bolt penetrating the inner case. More preferably, the refrigerator door further includes a guide bracket provided to the other side of the supporter to guide a plurality of wires connected to the ice making unit. In this case, an opening is provided to the inner case and the guide bracket is projected via the opening to guide a plurality of the wires to the ice making unit. 
     More preferably, the supporter holder includes a locking portion including a boss having the bolt locked thereto and a fixing portion outwardly extending from the locking portion to adhere closely to an inner side of the inner case. More preferably, the supporter holder further includes a fixing protrusion protruding from an end portion of the fixing portion in a direction opposite to the inner side of the inner case. 
     More preferably, the ice making unit is provided to an ice making room provided to the backside of the inner case. And, the refrigerator door further includes an insulation duct provided to the one side of the inner case configuring the ice making room to guide cold air flowing to an inside/outside of the ice making room. In this case, the insulation duct is formed of an insulation material. 
     More preferably, the insulation duct includes a cold air supply passage provided to one side of the insulation duct to introduce the cold air of the refrigerator into the ice making room by communicating with a cold air supply duct supplying the cold air of the refrigerator if the refrigerator door is closed and a cold air discharge passage provided to the other side of the insulation duct to discharge the cold air of the ice making room to the refrigerator by communicating with a cold air discharge duct discharging the cold air of the ice making room if the refrigerator door is closed. And, the insulation duct further includes a support bracket provided to an end portion of each of the cold air supply and discharge passages of the insulation duct opposing the inner case to prevent breakage of the insulation duct. In this case, a mounting portion is further provided to an outer circumference of each of the cold air supply and discharge passages of the insulation duct to be recessed into a corresponding shape enabling the support bracket to be mounted thereon and a vertically bent fixing portion is provided to each side of the support bracket to be fixed to the mounting portion. And, a gasket is provided to the inner case corresponding to a position of the corresponding support bracket to prevent leakage of the cold air by adhering closely to each of the cold air supply and discharge ducts if the refrigerator door is closed. 
     In this case, the gasket includes an elastic portion formed of an elastic material to selectively come into compressive contact with the cold air supply duct or the cold air discharge duct of the refrigerator and a fitting portion provided along an outer circumference of the elastic portion to be fitted into the support bracket by penetrating the inner case. 
     More preferably, at least one gasket fitting hole is provided to the support bracket and at least one fitting protrusion is provided to an outer side of the fitting portion of the gasket to be fitted into the at least one gasket fitting hole. 
     It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings: 
         FIG. 1  is a front diagram of a refrigerator according to a related art; 
         FIG. 2  is a perspective diagram of a refrigerator door according to a related art, in which a backside of the refrigerator door is shown; 
         FIG. 3  is a perspective diagram of the refrigerator door shown in  FIG. 2 , in which an inner configuration of the refrigerator is shown; 
         FIG. 4  is a perspective diagram of a refrigerator provided with a refrigerator door according to the present invention; 
         FIG. 5  is a perspective diagram of the refrigerator door shown in  FIG. 4 , in which an inner configuration of the refrigerator is shown; 
         FIG. 6  is a perspective diagram of an ice making unit provided to the door shown in  FIG. 4 ; 
         FIG. 7  is another perspective diagram of the ice making unit shown in  FIG. 6 ; 
         FIG. 8  is an exploded perspective diagram of an ice making unit assembled to an ice making room of the refrigerator door shown in  FIG. 4 ; 
         FIG. 9  is a perspective diagram of a fixing unit fixing the ice making unit of  FIG. 8  to the door; 
         FIG. 10  is a perspective diagram of the ice making unit assembled to the door in  FIG. 8 ; 
         FIG. 11  is a diagram of a backside of an inner case configuring a backside of the door in  FIG. 10 ; 
         FIG. 12  is a perspective diagram of one side of an inner case configuring an ice making room in  FIG. 10  and an insulation duct; and 
         FIG. 13  is a cross-sectional diagram according to a cutting line XIII-XIII in  FIG. 12 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. 
       FIG. 4  is a perspective diagram of a refrigerator provided with a refrigerator door according to the present invention. 
     Referring to  FIG. 4 , a refrigerator body  100  has a rectangular box shape of which front side is selectively open. An inside of the body  100  is partitioned into an upper part and a lower part by a partition wall  170  to configure a cold storage room  190  and a freezer room  180 , respectively. 
     And, refrigerator doors  110 ,  114  and  186  are provided to the open front side of the body  100 , i.e., open front sides of the cold storage room  190  and the freezer rooms  180 . The refrigerator doors  110 ,  114  and  186  include cold storage doors  110  and  114  selectively opening/closing the cold storage room  190  and a freezer room door  186  selectively opening/closing the freezer room  180 . 
     Meanwhile, one of the refrigerator doors  110  and  114  at left and right sides of the body  100  is provided with an ice making room (cf.  FIG. 8 )  140 , in which an ice making unit (cf.  FIG. 8 )  200  making ice is installed, and a dispenser (cf. ‘ 30 ’ in  FIG. 1 ) enabling ice made by the ice making unit  200  and purified water to be taken out without opening the corresponding refrigerator door. And, the ice making unit  200  will be explained in detail later. 
     An auxiliary tank  129  is provided to a lower part of the refrigerator door  110 . The auxiliary tank  129  is to temporarily store purified water supplied from outside. And, the auxiliary tank  129  is configured to have a size enough to continuously supply cool water even if a user keeps drawing water via the dispenser  30 . And, a pump and valve (not shown in the drawing) are provided to one side of the refrigerator door  110  in the vicinity of the auxiliary tank  129 . 
     As mentioned in the foregoing description, the freezer room  180  is provided under the cold storage room  190 , and more particularly, to the lower part of the body  100  as a separate space partitioned from the cold storage room  190 . And, the freezer room door  186  is provided to the open front side of the freezer room  180  to selectively open/close an internal space of the freezer room  180 . 
     A freezer room evaporator  184  is provided in rear of the freezer room  180 . The freezer room evaporator  184  generates cold air to cool down air within the freezer room  180  through heat exchange between a refrigerant flowing within the freezer room evaporator  184  and inner air of the freezer room  180 . Besides, the cold air generated by the freezer room evaporator  184  is introduced into the cold storage room  190  by a separately provided blowing fan, damper and the like (not shown in the drawing) to keep the refrigerator at temperatures suitable for cold and frozen storages. 
     Meanwhile, the cold air generated by the freezer room evaporator  184  is guided to the ice making room  140  via a cold air duct  130  in part. 
     In particular, in case that the refrigerator door  110  is closed, the ice making room  140  is configured to communicate with the cold air duct  130  built within a sidewall of the cold storage room  190 . Namely, the cold air duct  130  plays a role as a passage enabling the cold air of the freezer room  180  to be supplied to the ice making room  140  by having the ice making room  140  communicate with one side of the freezer room  180  in the vicinity of the evaporator  184 . And, the cold air duct  130  is built within a left sidewall of the cold storage room  190 . 
     The cold air duct  130  includes a cold air supply duct  132  transferring cold air to an inside of the ice making room  140  and a cold air discharge duct  133  transferring cold air used in making ice to the freezer room  180  from the ice making room  140 . And, the cold air supply duct  132  and the cold air discharge duct  133  are provided to an inner sidewall of the cold storage room  190  in parallel to each other. 
     End portions (not shown in the drawing) of the cold air supply and discharge ducts  132  and  133  are open to communicate with one side of the freezer room  180  provided with the evaporator  184 . The other open end portions of the cold air supply and discharge ducts  132  and  133  are exposed to the inner left sidewall of the cold storage room  190  to configure a duct inlet  136  and a duct outlet  138 , respectively. 
     The duct inlet  136  is configured to supply cold air to the inside of the ice making room  140  by communicating with a supply passage  410  of an insulation duct (cf. ‘ 400 ’ in  FIG. 12 ) that will be explained later. And, the duct outlet  138  is configured to discharge the cold air used in making ice from the ice making room  140  by communicating with a discharge passage  412  of the insulation duct  400 . 
       FIG. 5  is a perspective diagram of the refrigerator door shown in  FIG. 4 , in which an inner configuration of the refrigerator is shown. 
     Referring to  FIG. 5 , a shape of a refrigerator door  110  is formed by an outer case  116 . 
     A dispenser case  134  configuring an inner shape of a dispenser (cf. ‘ 30 ’ in  FIG. 1 ) is assembled to a backside of the outer case  116 . The dispenser case  134  is configured to have a rectangular opening at a front side of the refrigerator door  110  and is recessed and rounded toward a backside potion of the refrigerator door  110  to form a space facilitating ice or water to be drawn using a cup or receptacle. 
     A hinge hole  162 , at which the refrigerator door  110  is hinge-coupled, is provided to one side end of a cap deco  112  forming an upper exterior of the refrigerator door  110  by being assembled to a topside of the outer case  116 . And, water supply tubes  160  and  161  enter the refrigerator door  110  via the hinge hole  162 . 
     The water supply tubes  160  and  161  diverge from each other within the refrigerator door  110 . The former water supply tube  161  extends to an inside of an ice making room (cf. ‘ 140 ’ in  FIG. 8 ) to supply water used in making ice. And, the latter water supply tube  161  extends downward to supply water to an auxiliary tank (cf. ‘ 129 ’ in  FIG. 4 ). 
     Meanwhile, a tube guide  150  is provided under the dispenser case  134 . The tube guide  150  supports the water supply tube  160  extending to the auxiliary tank  129  or the dispenser  30 . In case that an inner space of the refrigerator  110  is filled up with a foaming liquid in assembling the refrigerator door  110 , the tube guide  150  is able to support the water supply tube  160  to be fixed thereto without movement. And, the tube guide  150  is also able to support and guide wires that connect electric parts including a pump (not shown in the drawing), a valve (not shown in the drawing) and the like. 
     Preferably, the tube guide  150  is formed of the same material of the foaming liquid (cf. ‘ 13 ’ shown in  FIG. 13 ) with which the inner space of the refrigerator door  110  is charged for insulation of the cold storage room  190 . And, the tube guide  150  is formed prior to the charging of the foaming liquid  118  and is then assembled within the refrigerator door  110 . 
     A plurality of spacing members  152  and  154  are formed on a backside of the tube guide  150 . The spacing members  152  and  154  enable the tube guide  150  to be spaced with a prescribed gap apart from one side of the refrigerator door  110 , and more particularly, from the backside of the outer case  116 . 
     In particular, the spacing members  152  and  154  are provided along a circumference of the backside of the tube guide  150 . Each of the spacing members  152  and  154  has a panel shape with a prescribed length and its lower end is installed at the backside of the outer case  116 . 
     So, the tube guide  150  is installed to be spaced with the length of the corresponding spacing member  152  or  154  apart from the backside of the outer case  116 . Preferably, a plurality of the spacing members  152  and  154  are provided along the circumference of the backside of the tube guide  150  with different gaps, respectively. 
     And, a plurality of the spacing members  152  and  154  can have various shapes, respectively. In particular, each of the spacing members  152  and  154  has a small rectangular panel shape having a prescribed length and its upper and lower ends are configured to come into contact with the backsides of the tube guide  150  and the outer case  116 , respectively. 
     Meanwhile, a plurality of the spacing members  152  and  154  differ from each other in width. 
     In particular, a width of the spacing member  154  provided to a part having relatively great resistance by the foaming liquid in charging the inside of the refrigerator door  110  is formed relatively longer than the other to enable the tube guide  150  to be stably installed. And, a width of the spacing member  152  provided to a part having a relatively smaller resistance is formed relatively shorter than the former. 
     Preferably, a width of the spacing member  152  or  154  provided to a corner or gap is formed relatively short to enable the foaming liquid to smoothly flow between a space between the backside of the tube guide  150  and the backside of the outer case  116 . Preferably, the spacing members  152  and  154  provided to a corner or gap are spaced with a relatively large gap apart from each other to enable the foaming liquid to smoothly flow between a space between the backside of the tube guide  150  and the backside of the outer case  116 . 
       FIG. 6  is a perspective diagram of an ice making unit provided to the door shown in  FIG. 4 . And,  FIG. 7  is another perspective diagram of the ice making unit shown in  FIG. 6 , in which an ice transferring lever  220  is removed. 
     Referring to  FIG. 6  and  FIG. 7 , an ice making unit  200  includes an ice making receptacle  210  having an ice making space  214  holding water to make ice, an assembling part  218  extending from one side of the ice making receptacle  210 , an ice transferring lever  220  revolving to draw the made ice from the ice making receptacle  210  and a drive unit  230  provided to one side of the ice making receptacle  210  and having a case  231  accommodating a motor (not shown in the drawing) driving the ice transferring lever  220  and the like. 
     The ice making receptacle  210  makes ice using water supplied via the water supply tube (cf. ‘ 161 ’ in  FIG. 5 ). In particular, a plurality of partitions  12  are provided within the ice making receptacle  210  to divide the ice making space  214  within the ice making receptacle  210  into a plurality of partitions. In this case, a plurality of the partitions  212  play a role in separating the ice made in the ice making space  214  into small units smoothly. 
     Meanwhile, a stripper  216  is provided to a topside of the ice making receptacle  210 . The stripper  216  includes a plurality of long and narrow ribs spaced apart from each other. The stripper  216  plays a role in enabling the ice made in the ice making receptacle  210  to correctly drop into an ice storage container (not shown in the drawing) under the ice making receptacle  210 . Besides, a heater (not shown in the drawing) can be provided under the ice making receptacle  210  to facilitate the complete ice to be detached from the ice making receptacle  210 . 
     Meanwhile, the assembling part  218  is configured to upwardly extend from one sidewall of the ice making receptacle  210 . The coupling part  218  is assembled to one side of the refrigerator door  110  to enable the ice making unit  200  to be assembled to the refrigerator door  110 . 
     The drive unit  230  is provided to one side of the ice making receptacle  210 . A case  232  configures a shape of the drive unit  230 . And, drive and control devices (not shown in the drawing) controlling operations of the ice making receptacle  210  are installed within the drive unit  230 . 
     A loading boss  222  is projected from one side of the case  232 . A passing hole (cf.  FIG. 7 )  224  is provided to the loading boss  222 . And, one end of the ice transferring lever  220  is fitted into the passing hole  224  to be connected to the drive device provided within the drive unit  230 . Besides, as an outer circumference of the loading boss  222  is circular, the water splashed on a guide part  240  is introduced into the ice making space  214  via the outer circumference of the loading boss  222 . 
     The guide part  240  is configured to be recessed into one lateral side of the case in the vicinity of the ice making receptacle  210 . The guide part  240  is placed above the loading boss  222  and has a downwardly tapering shape. In particular, the guide part  240  includes a first curved portion  242 , a second curved portion spaced apart from the first curved portion  242  and a third curved portion  246  connecting end portions of the first and second curved portions  242  and  244  together. 
     The first and second curved portions  242  and  244  play a role in enabling the water splashed on the guide part  240  from the ice making receptacle  210  to move back to the ice making receptacle  210  without flowing down along the case  232  when a user turns the refrigerator door  110 . 
     The third curved portion  246  connects the end portions of the first and second curved portions  242  and  244  together to enable the guide part  240  to have an overall shape of a looped curve. So, the third curved portion prevents the water splashed on the guide part  240  from the ice making receptacle  210  from moving above the guide part  240 . 
     Besides, as mentioned in the foregoing description, a distance between the first and second curved portions  242  and  244  of the guide part  240  is configured to become reduced toward the loading boss  222 . Preferably, the guide part  240  is able to have a shape of a rotor blade. The above-configured guide part  240  plays a role in introducing the water splashed on one side of the case  232  into the ice making space  214 . In particular, the guide part  240  prevents the water from flowing down outside the ice making space  214  in a manner of guiding the water splashed on one side of the case  232  in a direction of the loading boss  222 . 
     Meanwhile, one end of the ice transferring lever  220  is fitted into the passing hole  224  to be supported thereon. The ice transferring lever  220  is configured to rotate to draw the completely frozen ice from the ice making receptacle  210  using a rotational force of the drive motor (not shown in the drawings) provided within the drive unit  230 . 
     And, an ice detecting lever  228  is rotatably provided to one side of the case  232  to detect whether the ice storage container (not shown in the drawings), which is provided under the ice making receptacle  210 , is filled up with the ice. 
       FIG. 8  is an exploded perspective diagram of an ice making unit  200  assembled to an ice making room of a refrigerator door according to the present invention. 
     Referring to  FIG. 8 , an upper part of an inner case  124  forming a backside of a refrigerator door  110   a  is recessed to configure a shape of an ice making room  140 . 
     In particular, the inner case  124  forming a shape of the backside of the refrigerator door  110  provides a recessed space having an about rectangular shape on the upper part of the backside of the refrigerator door  110  to be projected along sides of the door  110 . Namely, the inner case  124  is configured to be projected along the sides of the door  110  on the backside of the refrigerator door  110  in a front direction of  FIG. 8 . And, an inside of the projected portion is recessed in a rear direction of  FIG. 8  to configure a space of the ice making room  140 . 
     The aforesaid receptacle  200 , an ice bank  270  and a transferring device  260  are loaded in the space of the ice making room  140  configured by the inner case  124 . 
     The ice made by the ice making unit  200  is temporarily stored in the ice bank  270  and is then supplied to the dispenser (cf. ‘ 30 ’ in  FIG. 1 ) by the transferring device  260 . 
     In particular, the ice bank  270  is provided between the ice making unit  200  and the transferring device  260 . The ice bank  270  is provided to temporarily store the ice made by the ice making unit  200 . The ice bank  270  having a panel shape configures a space for the storage to cut off a space between the ice making unit  200  and the transferring device  260 . And, the ice bank  270  is assembled to the ice making room  140  by coming into contact with both inner sides of the ice making room  140  to be fitted in-between. Alternatively, the ice bank  270  can be built in one body of the transferring device  260  to be loaded in the ice making room  140 . 
     The transferring device  260  is installed under the ice making receptacle, and more particularly, at a lower part of the ice making room  140 . The transferring device  260  is provided to supply the ice made by the ice making device  200  to the dispenser  30 . And, a DC motor (not shown in the drawing) and various devices (not shown in the drawing) for guide are provided within the transferring device  260  to supply a specific quantity of the ice. In this case, the transferring device  260  is loaded in the lower part of the ice making room  140  in a manner that a lower side, a rear side and both lateral sides of the transferring device  260  come into contact with inner sides of the ice making room  140 , i.e.,  24 . And, the transferring device  260  is installed to be loaded in the lower part of the ice making room  140 . 
     Meanwhile, the ice making unit  200  is locked to a fixing unit  300  (explained later) of the ice making room  140  by a bolt  250  without a separate support structure. And, the fixing unit  300  is explained in detail as follows. 
       FIG. 9  is a perspective diagram of a fixing unit fixing an ice making unit in a refrigerator door according to the present invention. 
     Referring to  FIG. 9 , a fixing unit  300  includes a supporter  310  fixed between an outer case (cf. ‘ 116 ’ in  FIG. 8 ) and an inner case (cf. ‘ 124 ’ in  FIG. 8 ) and a supporter holder  330  assembled to one side of the supporter  310  to be connected to an assembling part (cf. ‘ 218 ’ in  FIG. 6 ) of an ice making unit  200  by a bolt  250  penetrating the inner case  124 . 
     The supporter  310  is provided to assist the installation and operation of the ice making unit  200 . The supporter  310  is previously formed of foaming polystyrene (EPS) and then installed at an inside of a refrigerator door  110 , and more particularly, in the space between the outer case  116  and the inner case  124 . 
     In particular, the supporter  310  is loaded to be fixed to the space between the outer case  116  and the inner case  124  prior to the charging of the foaming liquid (cf. ‘ 118 ’ in  FIG. 13 ). And, the supporter  310  is configured to have the same height of the gap between the outer case  116  and the inner case  124  to be fixed within the refrigerator door  110 . 
     The supporter has an uneven shape at its bottom side coming into contact with the outer case  116  to enable the foaming liquid  118  to charge the inside of the uneven shape of the supporter  310  in case of injecting the foaming liquid  118 . By the charging of the foaming liquid  118 , the supporter  310  can be completely fixed not to move. 
     The supporter  310  is built within a position corresponding to an upper part of the ice making room  140  to assist the loading of the ice making unit  200 . For this, the supporter  310  is provided with a guide bracket  320  and a supporter holder  330 . 
     The guide bracket  320  is formed by plastic injection molding to have a multiply bent bracket shape to play a role in guiding a plurality of wires that supply power for the operation of the ice making unit  200  and carry signals for controlling the operation of the ice making unit  200 . 
     The guide bracket  320  is loaded to be fixed by being fitted into an upper part of the supporter  310  formed by foaming to have a shape corresponding to the guide bracket  320 . After the guide bracket  320  has been loaded, the supporter  30  can be assembled to the inside of the door  110 . 
     Meanwhile, one side of a connector (not shown in the drawing), which is connected to end portions of a plurality of wires, is provided to one side of the guide bracket. And, the connector (not shown in the drawing) is combined with pins (not shown in the drawing) correspondently provided to one side of the ice making unit  200  to enable electrical connections for the operation of the ice making unit  200 . To enable the connections to the pins at one side of the ice making unit  200 , one side of the guide bracket  320 , and more particularly, the connector loaded part can be projected to be externally exposed. An opening  141  is provided to one side of the inner case corresponding to the guide bracket  320 . And, it is able to load the guide bracket  320  to expose one side of the guide bracket  320  via the opening  141 . 
     Meanwhile, the supporter holder  330  is attached to one side of the supporter  310 . The supporter holder  330  is provided to be coupled with the bolt  250  locked to assemble the ice making unit  200 . And, the supporter holder  330  is fitted into one side of the supporter  3110  corresponding to a position to be locked by the bolt  250 . 
     The supporter holder  330  includes a locking portion  336  and a fixing portion  332 . 
     The locking portion  336  is provided for the locking of the bolt  250 . The locking portion  336  has a cylindrical shape with a prescribed height. And, a boss  337 , to which the bolt  250  is locked, is provided to a middle part of the locking portion  336  to correspond to a shape of the bolt  250 . Preferably, the locking portion  336  is configured to have the height corresponding to that of the supporter  310  to be completely fitted into the supporter  310 . And, the locking portion  336  is loaded to expose the boss  337  at one side of the inner case  124  only. 
     The fixing portion  332  is configured to extend outwardly from one side of an upper end of the locking portion  336 . And, the fixing portion  332  extends to be outwardly projected from the supporter  310 . 
     The fixing portion  332  is configured to adhere closely to a backside of the inner case  124 , and more particularly, to the backside of the inner case  124  opposing the outer case  116 . 
     In particular, if the inner case  124  is bent to have a prescribed curvature for the close adherence to the ice making unit  200 , the fixing portion  332  is bent to have the same curvature of the inner case  124 . So, a topside of the fixing portion  332  is able to completely adhere to the backside of the inner case  124  to enable surface contact in-between. Hence, the supporter holder  330  can be prevented from moving freely. 
     A fixing protrusion  334  is provided to an end portion of the fixing portion  332 . The fixing protrusion  334  is to fix a position of the supporter holder  330  by preventing the free movement of the supporter holder  330 . The fixing protrusion  334  is configured to protrude from the end portion of the fixing portion  332  in a direction opposite to the backside of the inner case  124 . 
     The fixing protrusion  334  is embedded in the foaming liquid  118  when the inside of the refrigerator door  110  is charged with the foaming liquid  118 . So, the fixing protrusion  334  protrudes to have a length enough to be completely fixed by being embedded in the foaming liquid  118 . Hence, as the position of the fixing portion  332  is fixed by the foaming liquid  118 , the supporter holder  330  can be prevented from moving freely within the supporter  310  and from being loosened in locking the bolt  250 . 
     A water supply tube  161  is provided to one side of the supporter  310  to supply water to the ice making unit  200 . The water supply tube is provided to guide water supplied from outside of the refrigerator to the ice making unit  200 . And, the water supply tube  161  is loaded in a manner that one end portion of the water supply tube  161  is externally exposed by penetrating the inner case  124 . 
       FIG. 10  is a perspective diagram of a backside of a refrigerator door according to the present invention. 
     Referring to  FIG. 10 , as mentioned in the foregoing description, the ice making unit  200 , the ice bank  270  and the transferring device  260  are provided within the ice making room  140 . 
     Meanwhile, an inlet (cf. ‘ 126 ’ in  FIG. 4 ) as an entrance for supplying cold air from the cold air duct (cf. ‘ 130 ’ in  FIG. 4 ) and an outlet (cf. ‘ 128 ’ in  FIG. 4 ) as an exit for discharging the cold air from the ice making room  140  are configured to penetrate a right sidewall of the ice making room  140 . 
     In this case, positions of the inlet and outlet  126  and  128  are provided to oppose positions of the right sidewall of the ice making room  140  coming into contact with the duct inlet and outlet (cf. ‘ 136 ’ and ‘ 138 ’ in  FIG. 4 ) of the cold air duct (cf. ‘ 130 ’ in  FIG. 4 ), respectively in revolving the refrigerator door  110  to close. So, when the refrigerator door  110  is closed, the inlet and outlet  126  and  128  adhere closely to the duct inlet and outlet  136  and  138 , respectively to communicate with each other. 
       FIG. 11  is a diagram of a backside of an inner case  124  in a refrigerator door according to the present invention. 
     Referring to  FIG. 11 , an insulation duct  400  is provided to one side of the inner case  124 , and more particularly, to a position corresponding to a wall of the ice making room  140  coming into contact with the duct inlet (cf. ‘ 136 ’ in  FIG. 4 ) and the duct outlet (cf. ‘ 138 ’ in  FIG. 4 ) of the cold air duct (cf. ‘ 130 ’ in  FIG. 4 ). In particular, the insulation duct  400 , which is provided to guide the cold air between the cold air duct (cf. ‘ 130 ’ in  FIG. 4 ) provided to one side of the body  100  and the ice making room  140 , is fitted into the backside of the inner case  124  provided with the inlet  126  and the outlet  128 . 
       FIG. 12  is an exploded perspective diagram of an insulation duct provided to one side of an inner case  124  and  FIG. 13  is a cross-sectional diagram according to a cutting line XIII-XIII in  FIG. 12 . 
     Referring to  FIG. 12  and  FIG. 13 , an insulation duct  400  formed of an insulating material by molding is assembled to one side of an inner case (cf.  FIG. 4 )  124  corresponding to an outer side of an ice making room (cf. ‘ 140 ’ in  FIG. 4 ). 
     The insulation duct  400  is to secure a passage of cold air flowing between a cold air duct (cf. ‘ 130 ’ in  FIG. 4 ) and an ice making room  140  prior to charging a refrigerator door  110  with a foaming agent. 
     Preferably, the insulation duct  400  is configured to have a correspondent size and shape to be fitted into a recessed portion of the inner case  124 . 
     And, the insulation duct  400  is formed of the same material of a foaming liquid  118  charged between an outer case  116  and the inner case  124  to insulate positions adjacent to the ice making room  140 , and more particularly, to the inlet  126  and the outlet  128 , thereby preventing the loss of cold air due to heat exchange. 
     Meanwhile, a cold air supply passage  410  and a cold air discharge passage  412  are provided to the insulation duct  400 . 
     The cold air supply passage  410  is formed by perforation to enable an inside and an outside of the ice making room  140  to communicate with each other. The cold air supply passage  410  is configured to enable the cold air supplied via the cold air supply duct  132  to be introduced into the ice making room  140 . 
     The cold air discharge passage  412  is provided below the cold air supply passage  410 . Like the cold air supply passage  410 , the cold air discharge passage  412  is formed by perforation to enable the inside and outside of the ice making room  140  to communicate with each other. And, the cold air discharge passage  142  is configured to enable the cold air, which is discharged from the ice making room  140  after having been used in making ice, to be discharged into the cold air discharge duct  133 . 
     Preferably, openings of the cold air supply and discharge passages  410  and  412  are configured to match the inlet  126  and the outlet  128  provided to one side of the ice making room  140  in assembling the insulating duct  400  to the inner case  400 . 
     Meanwhile, a mounting portion  420  is provided to one side of the insulation duct  400  coming into contact with the inlet  126  and the outlet  128 . 
     The mounting portion  420  facilitates the installation and fixation of a support bracket  430 . The mounting portion  420  is configured to be recessed inward to correspond to a shape of the support bracket  430 . And, the mounting portion  420  is provided to each of the openings along outer circumferences of the cold air supply and discharge passages  410  and  412 . In this case, the support bracket  430  is recessed inward by the thickness of the support bracket  430  in order that the support bracket  430  is not projected from one side of the insulation duct  400  is installing the support bracket  430 . 
     The support bracket  430  is provided to prevent the insulation duct  400  from being transformed by external impact and the like and being detached from the inner case  124 . The support bracket  430  is configured to have a plate shape to come into surface contact with the insulation duct  400 . And, the support bracket  430  includes a circular fitting portion  432  and a fixing portion protruding and extending from both upper and lower sides of the fitting portion  432 . 
     Preferably, the support bracket  430  is formed of plastic resin, which has rigidity better than that of the insulation duct  400  formed of the insulation material by foaming, by injection molding. 
     The fitting portion  432  is provided to reinforce rigidity of one portion of the insulation duct  400  by being fitted into each of the mounting portions  420  provided to the circumferences of the openings of the cold air supply and discharge passages  410  and  412  of the insulation duct  400 , respectively. And, the fitting portion  432  is configured to have a circular shape of which diameter is greater than that of each of the cold air supply and discharge passages  410  and  412 . An inside of the fitting portion  432  is configured to have a recessed shape overall. So, an outer circumference of the fitting portion  432  is projected upward. 
     A perforated hole  438  is provided to a center of the fitting portion  432  to have a same diameter of each of the openings of the cold air supply and discharge passages  410  and  412 . And, the perforated hole  438  is configured to match the corresponding opening of the cold air supply passage  410  or the cold air discharge passage  412  in fitting the support bracket  430 . 
     A plurality of gasket fitting holes  436  are provided to the fitting portion  432  outside the perforated hole  438 . A plurality of the gasket fitting holes  436  provided to attach a gasket  460 , which will be explained later, are formed at upper, lower, left and right sides of the perforated hole  438  by perforation, respectively. 
     Meanwhile, the fixing portions  434  are provided to upper and lower ends of the fitting portion  432  to be projected upward and downward, respectively. 
     The fixing portions  434  are provided to fix the corresponding support bracket  430 . And, the fixing portions  434  are fitted into upper and lower portions of the mounting portion  429  recessed to correspond to the shape of the support bracket  430 , respectively. 
     Each of the fixing portions  434  has a panel shape with a prescribed width and is configured to be vertically bent in a direction of the insulation duct  400  after having extended from an upper or lower end of the corresponding fitting portion  432  upwardly or downwardly by a prescribed length. In this case, the insulation duct  400  is projected to be surface-contactable with the extending and bent portions of each of the fixing portions  434 . And, the fixing portions  434  adhere closely to corners of the upper and lower portions of the projected portion of the insulation duct  400  to enable the corresponding support bracket  430  to be fixed to the insulation duct  400 . 
     Meanwhile, the inlet and outlet  126  and  128  having the openings are provided to one side of the inner case  124  corresponding to the positions of the support brackets  430 , respectively. And, sizes of the inlet and outlet  126  and  128  are configured to correspond to those of the fitting portions  432  of the support brackets  430 , respectively. And, inner circumferences (not shown in the drawings) of the inlet and outlet  126  and  128  are configured to be bent in directions of fitting the support brackets  430 , respectively, whereby the fitting portions  432  having recessed outer circumferences can be interrupted by the inner circumferences of the inlet and outlet  126  and  128  of the inner case  124 , respectively. 
     Hence, the support brackets  430  are mounted on the mounting portions of the insulation duct  400  to be fixed thereto, respectively and are interrupted by the inner circumferences of the inlet and outlet  126  and  128  of the inner case  124 , respectively, thereby enabling the insulation duct  400  to be fixed overall. 
     Meanwhile, the gaskets  460  are attached to the inner case  124  into which the support brackets  430  are fitted. 
     The gaskets  460  help the openings of the insulation duct  400  and the cold air duct  130  adhere closely to each other in closing the refrigerator door  110 . Preferably, the gaskets  460  are formed of an elastic material to enhance performance of adherence. 
     Each of the gaskets  460  includes an elastic portion  460  and a fitting portion  464 . 
     The elastic portion  462  is formed of an elastic material to adhere closely to an end portion of the opening of the cold air duct  130  provided to the body  100 . The elastic portion  462  comes into contact with the end portion of the opening of the cold air duct  130  when the ice making room  140  comes into contact with one side of the body  100  by the rotation of the refrigerator door  110 . In this case, the elastic portion  462  is compressed to adhere closely to an outer circumference of the end portion of the opening of the cold air duct  130 , whereby a gap between the cold air duct  130  and the ice making room  140  disappears for airtightness. 
     The fitting portion  464  is provided along an outer circumference of the elastic portion  462 . The fitting portion  464  is provided to attach the gasket  460  to the inner case  124 . The gasket  460  is configured to have a disc shape. Preferably, the fitting portion  464  is formed of a plastic material having a prescribed rigidity. 
     A center of the fitting portion  464  is perforated to enable cold air to pass through. Fitting protrusions  465  corresponding to the gasket fitting holes  436  of the support bracket  430  are provided to the fitting portion  464 , whereby the gasket  460  can be attached to the support bracket  430 . 
     Hence, the attachment of the gaskets  460  enhances the airtightness performance between the insulation duct  400  and the cold air duct  130 . 
     Meanwhile, in case that a user closes the refrigerator door  110 , the gasket  460  comes into the inner case  124  corresponding to the position of the fitting portion  432  of the corresponding support bracket  430  fitted into the insulation duct  400 . In this case, the support bracket  430  formed of an injection-molded plastic material having relatively high rigidity is able to support the weight applied by the gasket  460 . So, despite the weight attributed to the repetitive contacts by the gasket  460 , the support bracket  430  is able to support the insulation duct  400  to prevent from being transformed. 
     Accordingly, the present invention provides the following effects or advantages. 
     First of all, a tube guide is provided to be spaced with a prescribed gap apart from a backside of an outer case of a refrigerator. So, when an inside of a cold storage door is charged or filled with a foaming liquid, it can be evenly and smoothly charged with the foaming liquid. Hence, insulation efficiency of the refrigerator door can be raised and overall cooling performance of a refrigerator can be enhanced. 
     Secondly, an ice making unit is fixed by a fixing unit provided to an outer case of a refrigerator door. Compared to the related art of installing an ice making unit at an inner case in direct, the present invention is able to prevent transformation and breakage of an inner case. 
     Thirdly, a guide part is provided to an ice making unit. If a user closes a refrigerator door, water splashed on the ice making unit is reintroduced into the ice making unit. Hence, the present invention is able to prevent water from being splashed and frozen on other parts except the ice making unit. 
     Finally, a refrigerator employing a refrigerator door according to the present invention is a bottom freeze type refrigerator but is applicable to any kinds of refrigerators provided with a dispenser regardless of a refrigerator type. Furthermore, if a dispenser is provided to a freezer room, the present invention is applicable to a freezer room door. 
     It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.