Patent Publication Number: US-2022214101-A1

Title: Refrigerator

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority under 35 U.S.C. § 119 to Korean Application No. 10-2021-0001534 filed on Jan. 6, 2021, whose entire disclosure is hereby incorporated by reference. 
     BACKGROUND 
     1. Field 
     The present disclosure relates to a refrigerator. 
     2. Background 
     In general, a refrigerator is a home appliance that can store food at a low temperature in an internal storage space that is shielded by a door. To this end, the refrigerator is configured to store the stored food in an optimal state by cooling the inside of the storage space using cold air generated through heat exchange with a refrigerant circulating in the refrigeration cycle. 
     As such, refrigerators are gradually becoming larger and more multifunctional in accordance with changes in dietary habits and the trend of luxury products, and refrigerators having various structures and convenience devices in consideration of user convenience are being released. 
     For example, in recent years, a refrigerator equipped with a dispenser for taking out water from a refrigerator door or an ice maker for making ice in a freezing chamber or a freezing chamber door is being developed. In addition, a water tank in which water supplied to the dispenser is stored may be detachably provided on the rear surface of the refrigerating chamber door. 
     In Korean Patent Laid-Open No. 10-1999-004822, a water dispenser for the refrigerator capable of external water supply is disclosed so that water can be replenished to a water tank mounted inside from the outside of the door without opening the refrigerator door by building a simple structure inside the wall surface of the refrigerator door. 
     Meanwhile, such a conventional refrigerator has a problem that dew condensation occurs around a valve body formed to take out water by being connected to a water tank under the influence of external temperature and humidity. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments will be described in detail with reference to the following drawings in which like reference numerals refer to like elements, and wherein: 
         FIG. 1  is a front view illustrating a refrigerator according to an embodiment of the present disclosure; 
         FIG. 2  is a cross-sectional view taken along line II-II′ of  FIG. 1 ; 
         FIG. 3  is a side sectional view illustrating the structure of a water tank according to an embodiment of the present disclosure; 
         FIG. 4  is a side sectional view illustrating a water take-out valve according to an embodiment of the present disclosure; 
         FIG. 5  is a side sectional view illustrating a state where the water tank and the water take-out valve are fastened; 
         FIG. 6  is a cross-sectional view illustrating a state where the water take-out valve is opened; and 
         FIG. 7  is a view illustrating a state where a heating wire is mounted on the dispenser according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, specific embodiments of the present disclosure will be described in detail with reference to the drawings. However, the present disclosure cannot be said to be limited to the embodiments in which the spirit of the present disclosure is presented, and other disclosures that are degenerate by addition, changes, deletions, or the like of other elements or other embodiments included within the scope of the present disclosure can be easily suggested. 
       FIG. 1  is a front view illustrating a refrigerator according to an embodiment of the present disclosure. 
     As illustrated in the drawing, the refrigerator  1  according to an embodiment of the present disclosure may include a cabinet  10  forming a storage space, and a door  20  disposed in front of the cabinet to open and close the storage space. 
     The door  20  may be disposed by being hinged with the cabinet  10  and may open and close the storage space by rotation. In addition, a handle  201  recessed inwardly on the front surface of the door  20  to allow a user to open and close the door  20  may be provided. 
     In addition, a dispenser  30  may be provided on the front surface of the door  20 . The dispenser  30  allows a user to take out water by operating the dispenser from the outside, has a recessed part recessed from the front surface to the rear of the lower door  20 , and can operate the take-out lever  32  from the inside so that the water is taken out. 
     In this embodiment, the refrigerator is described as an example of a refrigerator having a single door  20 , but as an example, the cabinet may form a storage space partitioned up and down, and an upper door disposed above the cabinet and a lower door disposed below the cabinet may be provided, respectively, and the dispenser  30  is not limited to the position and shape of the door, and it should be noted in advance that it can be applied to various types of refrigerator doors. 
     Hereinafter, a dispenser provided in the door will be described in more detail with reference to the drawings. 
       FIG. 2  is a cross-sectional view taken along line II-II′ of  FIG. 1  and  FIG. 3  is a side sectional view illustrating the structure of a water tank according to an embodiment of the present disclosure. 
     As illustrated, the dispenser  30  is provided on the front surface of the door  20 , and the water tank  40  is mounted on the rear surface of the door  20 . 
     In detail, the door  20  may include a front plate that forms an outer appearance of the front surface of the door, and a door liner that is coupled to the front plate to form a rear surface of the door. A water tank  40  may be detachably mounted on the rear surface of the door  20 . 
     The water tank  40  is for storing water supplied to the dispenser  30  and may be provided at the rear surface of the door  20 . Accordingly, the water tank  40  may be located inside the refrigerating chamber and naturally cooled by the cold air inside the refrigerating chamber to provide cooled water to the dispenser  30 . 
     The water tank  40  may be located above the dispenser  30 , so that when the dispenser  30  is operated, the water inside the water tank  40  can be supplied to the dispenser  30  by its own weight. 
     The water tank  40  may include a tank body  41  in which water is stored, and a tank cover  42  that shields the opened upper surface of the tank body  41 . At least a part of the tank body  41  may be made of a transparent material, and the user may easily check the amount of water stored in the water tank  40 . 
     In addition, a drain port  43  may be provided at the lower end of the water tank  40 . The drain port  43  may extend downward to allow the water of the water tank  40  to be taken out from the dispenser  30 . In other words, when the water tank  40  is mounted on the door, the drain port  43  may extend toward the water take-out space while facing the front of the door. 
     The outer circumferential surface of the drain port  43  includes a valve coupling part  431  formed of a screw thread. For example, the valve coupling part  431  may be fastened to a screw thread mated with the coupling part  511  provided on the upper end of the pipe part  51  of the water take-out valve  50 . 
     Of course, the outer circumferential surface of the drain port  43  may be formed in various shapes in which the drain port  43  can be inserted and fixed inside the pipe part  51  in addition to the screw thread, but is not limited thereto. 
     In addition, the valve coupling part  431  is in surface contact with a sealing part  512  to be described later. In other words, the sealing part  512  may be provided between the valve coupling part  431  and the fastening part  511 . The sealing part  512  prevents the temperature of the drain port  43  cooled by the water of the water tank  40  from being conducted to the fastening part  511 , thereby being capable of preventing the temperature of the valve body  55  from being lowered. Accordingly, it is possible to prevent dew condensation from forming around the valve body  55 . 
     Hereinafter, a water take-out valve according to an embodiment of the present disclosure will be described in detail. 
       FIG. 4  is a side sectional view illustrating a water take-out valve according to an embodiment of the present disclosure,  FIG. 5  is a side sectional view illustrating a state where the water tank and the water take-out valve are fastened,  FIG. 6  is a cross-sectional view illustrating a state where the water take-out valve is opened. 
     The water take-out valve  50  of the present disclosure includes a valve body  55  provided inside the piping part  51  serving as a passage through which water of a water tank flows. 
     A fastening part  511  into which the drain port  43  of the water tank  40  is inserted is formed inside the pipe part  51 . 
     In addition, a sealing part  512  that is in surface contact with the fastening part  511  is provided inside the pipe part  51 . The sealing part  512  may be provided between the valve coupling part  431  and the fastening part  511 . In other words, the valve coupling part  431  and the coupling part  511  may be spaced apart from each other by the sealing part  512 . 
     The sealing part  512  may be formed of an elastically deformable rubber or silicone material and may be configured to be fixed between the fastening part  511  and the valve coupling part  431  by an interference fit method, adhesion, or mating. 
     One surface of the sealing part  512  in contact with the valve coupling part  431  may be formed in a shape to mate with the valve coupling part  431 . In addition, the other surface of the sealing part  512  in contact with the fastening part  511  may be formed in a shape to mate with the fastening part  511 . 
     The sealing part  512  may extend from an end portion to the other end portion of the fastening part  511 . In addition, the sealing part  512  may extend from an end portion to the other end portion of the valve coupling part  431 . 
     The sealing part  512  may extend to contact a portion of the compression ring  513 . 
     With this structure, the sealing part  512  may block direct conduction of heat from the drain port  43  cooled by the temperature of the water stored in the water tank  40  to the valve body  55 . In other words, it is possible to prevent the heat of the water tank  40  cooled by water from being directly transmitted to the valve body  55 , that is, the pipe part  51  by the sealing part  512 . Accordingly, it is possible to prevent the temperature of the valve body  55  from being lowered by the temperature of the water, and thus it is possible to prevent dew condensation around the pipe part. 
     In addition, at the lower end portion of the fastening part  511 , when the drain port  43  and the pipe part  51  are fastened, a compression ring  513  for sealing between the end portion of the drain port  43  and the end portion of the pipe part  51  may be provided. 
     Since the compression ring  513  has a rectangular cross section, it can be sealed even if there is a slight difference in size and shape between the end portion of the drain port  43  of the water tank  40  and the end portion of the pipe part  51 . 
     The water take-out valve  50  is provided with an outer wall  52  extending from the pipe part  51  and forming a portion of the outer surface of the water take-out valve  50  and an inner wall  53  spaced apart from the outer wall  52  and having a smaller diameter than the outer wall  52 . In addition, the hollow portion  521  defined by the interval between the inner wall  53  and the outer wall  52  may be provided below the compression ring  513 . 
     An elastic body  522  such as a compression coil spring is installed in the hollow part  521 , wherein the elastic body  522  elastically supports the valve body  55  with respect to the pipe part  51  in a direction in which the valve body  55  is pushed. When the take-out lever  32  is pressed by the user, the force that the user presses on the take-out lever overcomes the elastic force of the elastic body  522  and the valve body  55  is inserted toward the pipe part  51 . Then, when the user releases the force pressing the take-out lever by completing water intake or the like, the valve body  55  slides toward the end portion of the pipe part by the elastic body  522 . 
     The inner wall  53  may be formed to extend further inward than the position in which the compression ring  513  is provided in the inner space of the water take-out valve  50 . 
     The inner wall  53  may be partitioned into a first inner wall  531  positioned above the reduced diameter part  533  and a second inner wall  532  positioned lower than the first inner wall  531 . An inner diameter of the first inner wall  531  may be larger than an inner diameter of the second inner wall  532 . 
     The reduced diameter part  533  may have an inclination such that the diameter gradually decreases as it moves downward along the length direction of the pipe part  51 . In addition, the reduced diameter part  533  may have an inclined surface  534  to be in close contact with the opening and closing ring  35  of the valve body, which will be described later. 
     In addition, an outer insert ring  506  may be selectively fitted to the inner wall part of the reduced diameter part  533 . 
     Meanwhile, an outer insert part  503  of the valve body may be inserted into the space between the second inner wall  532  and the outer wall  52 . 
     The valve body  55  according to an embodiment of the present disclosure is fitted to the pipe part  51  and slides along the longitudinal direction of the pipe part  51  to open and close the opening and closing surface  54 . 
     The valve body  55  includes a second valve body  57  inserted into a second inner wall  532  from an end portion of the pipe part  51 , and a first valve body  56  inserted into the second valve body  57 . In addition, a coupling ring  561  for sealing a gap generated between the first and second valve bodies  57  may be provided. 
     The second valve body  57  has two or more blade shapes projecting radially, and the end portion of the blade cooperates with the inner wall surface of the first inner wall  531  to guide the sliding movement of the valve body. 
     The second valve body  57  has an extension part  58  formed at an end portion adjacent to the drain port  43 . The extension part  58  may be formed on the second valve body at a position corresponding to the position where the coupling ring  561  is provided. The extension part  58  may extend from an end portion of the second valve body in a direction away from the center of the first valve body  56 . In other words, the extension part  58  may extend from the end portion of the second valve body in the direction of the fastening part  511 . 
     The extension part  58  serves to block the movement of water in the water tank  40  into the valve body  55  in a state where the user does not press the take-out lever  32 . 
     In other words, the extension part  58  prevents water from circulating in the space between the pipe part  51  and the inner wall  531  in a state where the opening and closing surface  54  is closed. Accordingly, it is possible to prevent the temperature from being lowered by the water circulating in the space between the pipe part  51  and the inner wall  531 , thereby preventing the formation of dew condensation around the valve body  55 . 
     The extension part  58  may further include an inclined part  581  in contact with the coupling ring  561 . The inclined part  581  is formed to have a cross-sectional area gradually increasing toward the end portion, so that one side of the coupling ring  561  can be supported. 
     The extension part  58  may be formed with a predetermined distance from the inner surface of the drain port  43  in a state where the valve coupling part  431  and the fastening part  511  are coupled. 
     In addition, a groove  582  recessed in the center direction of the first valve body  56  is formed on one surface of the extension part  58 . A leak prevention ring  59  for sealing a gap between the drain port  43  and the valve body  55  may be provided in the groove  582 . In other words, in a state where the leak prevention ring  59  is mounted in the groove  582  of the extension part  58 , a portion of the leak prevention ring  59  has a structure in close contact with the first inner wall  531 . 
     Meanwhile, when the user presses the take-out lever  32  to move the valve body  55  toward the inside of the drain port  43 , the extension part  58  and the leak prevention ring  59  are moved together with the second valve body  57  to have a structure that is spaced apart from the inner wall of the pipe part  51 . Accordingly, the water stored in the water tank  40  may flow into the valve body  55  through the pipe part  51 . 
     With a structure like this, the leak prevention ring  59  may seal between the inner wall  53  and the second valve body  57  when the valve body  55  slides. Accordingly, in a state where the user does not press the take-out lever  32 , the water inside the water tank  40  flows into the pipe part  51  and thus can block the inflow of water into the space  520  between the second valve body  57  and the first inner wall  531 . 
     In addition, as the valve body  55  slides, it is possible to prevent water from flowing into and circulating into the space  520 , thereby preventing the formation of dew condensation around the valve body  55 . 
     Meanwhile, the opening/closing ring  35  is fitted in the portion where the second valve body  57  faces the inclined surface  534  of the reduced diameter part  533  to be in close contact with the inclined surface  534  and in close contact with the opening and closing surface  54 . 
     At the end portion of the valve body  55 , a cover surface  501  covering the end portion, a rib  502  extending inwardly along the longitudinal direction of the pipe part from the inside of the inner wall  53  of the pipe part, and an outer insert part  503  extending inwardly along the longitudinal direction of the pipe part between the inner wall  53  and the outer wall is provided. 
     The cover surface  501  may be formed to be generally flat, and a water take-out port  504  through which water is discharged may be provided in a central portion of the cover surface  501 . 
     In addition, the rib  502  may be formed to extend from the cover surface  501  in the longitudinal direction of the pipe part  51 . 
     Further, in the present disclosure, a drain passage for lowering the pressure of water flowing into the space between the outer wall surface of the second inner wall  532  and the inner wall surface of the an outer insert part  503  may be further provided. The drain passage may be a cutout  505  that passes through the cover surface between the rib  502  and the outer insert part  503  and is connected to the water take-out port  504  of the cover surface. 
     The cutout  505  serves to relieve the water pressure formed in the space between the rib  502  and the an outer insert part  503 , and serves to allow the water flowing out from the space between the rib  502  and the outer insert part  503  to merge with the main stream in order to relieve the water pressure. 
     Hereinafter, the operating principle of the water take-out valve will be described in detail. 
     A compression coil spring, which is an elastic body, is installed in the hollow part  521 , and the elastic body elastically supports the valve body  55  in a direction in which the valve body  55  is pushed by the pipe part  51 . In other words, in the normal state where the take-out lever  32  is not pressed, the elastic body  522  pushes the valve body. The end portion of the elastic body  522  is supported by the seating groove  582 , and the elastic force of the elastic body pushes the outer insert part  503  outward. The outer insert part  503  is a portion which is integral with the first valve body  56 , and the first valve body  56  may maintain a state of being pressed outward by the elastic force of the elastic body  522 . In addition, the force of the first valve body  56  is transmitted to the first valve body  56  through a coupling ring  561 , and the coupling ring  561  may seal a gap between the first valve body  56  and the second valve body  57 . 
     In addition, the second valve body  57  is pressed to the outside, and the opening and closing ring  35  is in close contact with the inclined surface  534  of the pipe part  51  to seal the opening and closing surface  54 . 
     Meanwhile, when the take-out lever  32  is pressed by the user, the valve body  55  is pressed by the force of the user pressing the take-out lever  32 . In other words, the force that the user presses the take-out lever  32  overcomes the elastic force of the elastic body  522  to insert the valve body  55  toward the pipe part  51 . Then, as the opening and closing surface  54  is opened, water in the upstream  510  flows out into the front chamber part  530  through the opening and closing surface  54 , and the water flowing into the front chamber part  530  is discharged to the outside through the water take-out port  504 . 
     After that, when the user releases the force pressing the take-out lever  32  by completing water take-out, The valve body  55  slides toward the end portion of the pipe part  51  by the elastic body  522 , that is, toward the outside. In this state, the front chamber part  530  is isolated from the external space except for the water take-out port  504 . 
     At this time, the water flowing from the water tank  40  to the drain port  43  does not flow in the space  520  between the inner wall  53  of the pipe part  51  and the valve body  55  by the leak prevention ring  59  and stays on the fastening part  511 . In other words, in a state where the opening and closing surface  54  is closed by the valve body  55 , by the extension part  58  and the leak prevention ring  59  provided on the extension part  58 , it is possible to block water from flowing into the space between the inner wall  53  and the valve body  55 . In detail, by means of the extension part  58  and the leak prevention ring  59  provided on the extension part  58 , it is possible to block the inflow of water into the space between the upper end of the valve body  55  and the opening and closing surface  54 . In other words, the water stored in the water tank  40  by the leak prevention ring  59  stays in the inner space of the valve coupling part  431 , and the space  520  formed by the valve body  55 , the pipe part  51 , and the opening and closing surface  54  is maintained in a sealed state so that water does not flow into the space. 
     Accordingly, in a state where the opening and closing surface  54  is closed, water stored in the water tank  40  flows into the water take-out valve  50  to prevent the temperature of the water take-out valve  50  from being lowered by the water. In addition, it is possible to minimize water retention in the water take-out valve  50 , thereby ultimately preventing dew condensation from occurring around the water take-out valve  50 . 
     In addition, direct contact with the drain port  43  can be prevented by the sealing part  512  provided on the fastening part  511  of the pipe part  51 . In other words, it is possible to maintain a predetermined distance between the fastening part  511  and the drain port  43  by the sealing part  512 . Accordingly, the sealing part  512  serves as a buffer so that the heat of the drain port  43  is not directly conducted to the fastening part  511 . With this structure, the water take-out valve  50  can minimize the influence of the temperature of the water tank  40  cooled by the cold air, thereby preventing the formation of dew condensation around the water take-out valve  50 . 
     Meanwhile, in the refrigerator according to an embodiment of the present disclosure, a heating wire may be provided at a portion where the water take-out valve is inserted into the rear surface of the door. 
       FIG. 7  is a view illustrating a state where a heating wire is mounted on the dispenser according to an embodiment of the present disclosure. 
     The door  20  includes a front plate  21  forming an outer appearance of the front surface and a door liner forming a rear surface. 
     A dispenser fixing part  60  formed to support a portion of the dispenser  30  is provided on the rear surface of the front plate  21 . 
     A connector  61  into which the water take-out valve  50  is inserted is provided above the dispenser fixing part  60 , so that the drain port  43  of the water tank  40  and the water take-out valve  50  communicate with each other. 
     In addition, a heating wire  62  capable of preventing dew condensation may be provided on the outer circumferential surface of the connector  61 . In other words, by attaching the heating wire  62  to the outer circumferential surface of the connector  61 , it is possible to increase the temperature of the circumferential portion of the connector  61 , thereby preventing dew condensation from occurring around the connector  61  due to the water with a lower temperature. 
     The heating wire  62  is provided in a structure surrounding the outer circumferential surface of the connector  61 , and the temperature around the connector  61  is lowered by water passing through the valve body  55 , thereby preventing dew condensation from occurring. 
     The heating wire  62  is buried by an adiabatic material that insulates between the front plate  21  and the door liner to prevent exposure to the outside. 
     An object of the present disclosure is to provide a refrigerator including a dispenser capable of preventing dew condensation from forming around a valve body connected to a water tank. 
     An object of the present disclosure is to provide a refrigerator capable of preventing the residual water from falling by minimizing the amount of water remaining in a valve body. 
     Technical Solution 
     A refrigerator according to an embodiment of the present disclosure includes a cabinet configured to form a storage space, a door configured to open and close the storage space, a dispenser configured to be formed on a front surface of the door, a water tank configured to be provided detachably from the door above the dispenser and including a drain port for discharging stored water, a pipe part configured to communicate with the water tank to form a passage for discharging water, and a water intake valve including a valve body that slides along the longitudinal direction of the pipe part and opens and closes an opening and closing surface of the pipe part, in which the valve body includes an extension part configured to extend from one surface of the valve body toward an inner surface of the passage, and a leak prevention ring configured to be provided around the extension part to seal between the pipe part and the valve body in a state where the opening and closing surface is closed by the valve body. 
     The pipe part may include an outer wall configured to form a part of an outer surface of the water intake valve, and an inner wall provided to be spaced apart from the outer wall and having a smaller diameter than the outer wall, in which the leak prevention ring may be formed to be in contact with the inner wall when the opening and closing surface is closed by the valve body. 
     The leak prevention ring may be provided at an upper end of the valve body to block water from the drain port from flowing into a space between the pipe part and the valve body. 
     The valve body may include a first valve body inserted into the inner wall and slidingly moved in the longitudinal direction of the pipe part, and a second valve body formed along the circumferential surface of the first valve body and formed to be in contact with a portion of the inner wall, and the extension part may extend from one surface of the second valve body in a direction of the pipe part. 
     A groove recessed in the central direction of the valve body may be formed on the outer surface of the extension part, and the leak prevention ring may be mounted in the groove. 
     The leak prevention ring may be provided to be spaced apart from the inside of the drain port at a predetermined interval. 
     The valve body may include a coupling ring configured to seal a gap between the first valve body and the second valve body, and the extension part may be formed to have a cross-sectional area that increases from the center of the valve body toward the inner wall and includes an inclined part configured to be in contact with the coupling ring. 
     The upper end of the extension part may be positioned on the same extension line as the coupling ring. 
     A fastening part into which the drain port is inserted may be provided in the upper end of the inside of the drain port, and a sealing part spaced apart between the fastening part and the drain port may be provided in the fastening part. 
     The sealing part may extend along the longitudinal direction of the fastening part and may be in surface contact with the drain port. 
     The sealing part may be made of elastically deformable rubber or silicone material. 
     A compression ring sealing the end portion of the drain port may be provided in one end of the fastening part, and the sealing part may be provided to be in contact with a portion of the compression ring. 
     The pipe part and the valve body may be provided in the refrigerator door, a take-out lever may be installed on the door, and the force for pressing one side of the take-out lever may be transmitted to the valve body so that the valve body opens the opening and closing surface of a pipe part. 
     The door may include a front plate configured to form an outer appearance of a front surface, a door liner configured to form a rear surface, and a dispenser fixing part formed to support a portion of the dispenser on the rear surface of the front plate, in which a connector into which the water intake valve is inserted may be provided above the dispenser fixing part. 
     A heating wire may be attached to the outer circumferential surface of the connector. 
     Advantageous Effect 
     The refrigerator according to the embodiment of the present disclosure can expect the following effects. 
     The present disclosure includes an extension part extending in the direction of the inner wall of the pipe part from the upper end of the valve body, and a leak prevention ring mounted around the extension part. Accordingly, in a state where the opening and closing surface of the pipe part is closed by the valve body, it is possible to maintain a sealed state between the pipe part and the valve body. Accordingly, water flowing through the drain port of the water tank may be blocked by the leak prevention ring, thereby preventing the water from flowing into the pipe part. 
     Since water is not circulated inside the pipe part in a state where the opening and closing surface of the pipe part is closed by the leak prevention ring, it is possible to prevent the temperature inside the water take-out valve from being lowered by the temperature of the water. Accordingly, it is possible to prevent dew condensation from occurring around the water take-out valve. 
     In addition, the present disclosure is characterized in that a sealing part is provided inside the pipe part into which the drain port is inserted. The sealing part may separate the drain port inserted into the pipe part by a predetermined distance from the pipe part. Accordingly, it is possible to prevent direct conduction of heat from the drain port, whose temperature is lowered by the water in the water tank, to the pipe part. Thereby, it is possible to prevent dew condensation from occurring around the pipe part. 
     Also, in the present disclosure, a heating wire may be provided on an outer circumferential surface of a connector which is formed on the door and into which the water take-out valve is inserted. Accordingly, it is possible to prevent a temperature difference between the inside and outer surfaces of the door from occurring due to the water flowing through the water take-out valve. Accordingly, it is possible to prevent dew condensation from occurring around the connector and the door. 
     It will be understood that when an element or layer is referred to as being “on” another element or layer, the element or layer can be directly on another element or layer or intervening elements or layers. In contrast, when an element is referred to as being “directly on” another element or layer, there are no intervening elements or layers present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     It will be understood that, although the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section could be termed a second element, component, region, layer or section without departing from the teachings of the present invention. 
     Spatially relative terms, such as “lower”, “upper” and the like, may be used herein for ease of description to describe the relationship of one element or feature to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “lower” relative to other elements or features would then be oriented “upper” relative to the other elements or features. Thus, the exemplary term “lower” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated  90  degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. 
     The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. 
     Embodiments are described herein with reference to cross-section illustrations that are schematic illustrations of idealized embodiments (and intermediate structures). As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments should not be construed as limited to the particular shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. 
     Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. 
     Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments. 
     Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.