Patent Document

CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    Pursuant to 35 U.S.C. §119(a), this application claims the benefit of earlier filing date and right of priority to Korean Application No. 20-2016-0001076, filed on Feb. 26, 2016, the contents of which are all hereby incorporated by reference herein in its entirety. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present disclosure relates to a motor control center, and particularly, to a motor control center in which a motor control center (MCC) unit is mounted on a partition plate. 
         [0004]    2. Background of the Invention 
         [0005]    A motor control center (MCC) is a system for safely protecting a load device related to a motor installed in various industrial facilities. 
         [0006]    The motor control center has a function of distributing low voltage electricity supplied from a transformer to a motor, and monitoring and preventing flowing of an overcurrent. 
         [0007]    The motor control center may receive a plurality of electric control devices (or MCC units) in a cabinet (e.g., an iron enclosure), and the MCC units may be detachably installed in the cabinet. 
         [0008]    In the motor control center, a plurality of electric control device (or an MCC unit) may be received in a cabinet (e.g., an iron enclosure) and may be detachably installed in the cabinet. 
         [0009]    The motor control center may have a bus (bus bar) for supplying electricity to the interior, and the MCC unit may be moved as a drawer so as to be connected to the bus. 
         [0010]    As a related art of the present disclosure, Korean Patent Utility Model No. 20-1998-010870 may be referred to. 
       SUMMARY OF THE INVENTION 
       [0011]    Therefore, an aspect of the detailed description is to provide a motor control center (MCC) in which a movement of an MCC unit is restrained such that the MCC unit is stably installed without being separated. 
         [0012]    To achieve these and other advantages and in accordance with the purpose of this specification, as embodied and broadly described herein, a motor control center (MCC) including a cabinet, a bus located within the cabinet, a partition vertically partitioning the inside of the cabinet, and an MCC unit located on the partition and including a clip connected to the bus, the MCC may include: a first guide located on a lower surface of the MCC unit and having a protrusion part; and a second guide located on an upper surface of the partition and slidably guiding the first guide in a forward/backward direction, wherein the second guide has rise limiting parts limiting rise of the protrusion part. 
         [0013]    The second guide may include a pair of side guides facing each other and a rear stopper linking rear ends of the pair of side guides, and the rise limiting parts may be provided in the pair of side guides, respectively. 
         [0014]    The first guide may include a main body part inserted between the pair of side guides, and the protrusion part may protrude from a side surface of the main body part so as to be stepped. 
         [0015]    The protrusion part may be positioned between the rise limiting parts and the partition. 
         [0016]    The protrusion part may be spaced apart from a lower surface of the MCC unit in a vertical direction below the MCC unit, and the rise limiting parts may be spaced apart from an upper surface of the partition in a vertical direction above the partition. 
         [0017]    The sum of a thickness of the protrusion part and a thickness of the rise limiting parts may be equal to or greater than a height of the main body part. 
         [0018]    The MCC may further include guide rails installed on an upper surface of the partition and guiding sliding of the MCC unit in a forward/backward direction, wherein side protrusions protrude from a side surface of the MCC unit, and guide slits slidably guiding the side protrusion in a forward/backward direction are provided in the guide rails, respectively. 
         [0019]    The guide slits may be provided to extend in a forward/backward direction from a front end of the guide rails, respectively. 
         [0020]    The first guide may be provided in plurality on a lower surface of the MCC unit, the plurality of first guides may be located in different horizontal position and vertical position on a lower surface of the MCC unit, and the second guide may be provided to correspond to the number of the first guide and located in positions corresponding to the positions where the first guide is disposed. 
         [0021]    According to embodiments of the present disclosure, since the second guide slidably guiding the first guide in a forward/backward direction limits rise of the first guide, separation of the MCC unit may be minimized, and since the MCC unit is mounted in a normal position, high reliability may be obtained. 
         [0022]    Also, since movement of the first guide is limited in a horizontal direction by the pair of side guides and in a vertical direction by the rise limiting parts and the partition, distorted installation of the MCC unit may be minimized. 
         [0023]    Also, the clip may be connected to the bus with high accuracy, without causing an erroneous connection. 
         [0024]    Also, since the side protrusion protruding to a side surface of the MCC unit is slidably guided in a forward/backward direction along the guide slit of the guide rail, the side surface of the MCC unit may stably slide to the guide rail and separation of the MCC unit may be minimized. 
         [0025]    Also, the side protrusion protruding to a side surface of the MCC unit may smoothly enter the guide slit on a rear side of the guide rail. 
         [0026]    Further scope of applicability of the present application will become more apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the scope of the invention will become apparent to those skilled in the art from the detailed description. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0027]    The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments and together with the description serve to explain the principles of the invention. 
           [0028]    In the drawings: 
           [0029]      FIG. 1  is a side view illustrating an interior of a motor control center (MCC) according to an embodiment of the present disclosure. 
           [0030]      FIG. 2  is a perspective view illustrating an MCC unit and a partition plate of an MCC according to an embodiment of the present disclosure. 
           [0031]      FIG. 3  is an enlarged cross-sectional view illustrating a state in which a clip installed in an MCC unit of an MCC is connected to a bus according to an embodiment of the present disclosure. 
           [0032]      FIG. 4  is a bottom view of an MCC unit of an MCC according to an embodiment of the present disclosure. 
           [0033]      FIG. 5  is a perspective view illustrating an upper surface of a partition plate of an MCC according to an embodiment of the present disclosure. 
           [0034]      FIG. 6  is a plan view illustrating a configuration in which a first guide illustrated in  FIG. 4  is slidably mounted on a second guide illustrated in  FIG. 5 . 
           [0035]      FIG. 7  is a perspective view illustrating a state in which the first guide illustrated in  FIG. 4  is slidably mounted on the second guide illustrated in  FIG. 5 . 
           [0036]      FIG. 8  is a cross-sectional view illustrating a state in which the first guide illustrated in  FIG. 4  is slidably mounted on the second guide illustrated in  FIG. 5 . 
           [0037]      FIG. 9  is a cross-sectional view illustrating a state in which an MCC unit of an MCC is completely mounted on a guide rail according to an embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0038]    Description will now be given in detail of the exemplary embodiments, with reference to the accompanying drawings. For the sake of brief description with reference to the drawings, the same or equivalent components will be provided with the same reference numbers, and description thereof will not be repeated. 
         [0039]    Hereinafter, a specific embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.  FIG. 1  is a side view illustrating an interior of a motor control center (MCC) according to an embodiment of the present disclosure,  FIG. 2  is a perspective view illustrating an MCC unit and a partition plate of an MCC according to an embodiment of the present disclosure, and  FIG. 3  is an enlarged cross-sectional view illustrating a state in which a clip installed in an MCC unit of an MCC is connected to a bus according to an embodiment of the present disclosure. 
         [0040]    A motor control center (MCC) includes a cabinet  1 , a bus  2 , and an MCC unit  3 . 
         [0041]    The cabinet  1  may form an appearance of the MCC. The cabinet  1  may have a space S for accommodating the bus  2  and the MCC unit  3 . The cabinet  1  may be open at one side thereof. The MCC unit  3  may enter through the open side of the cabinet  1 . 
         [0042]    The cabinet  1  may include a base  11 , a pair of side body  12  and rear body  13  located on the base  11 , and a top cover  14  located on the pair of side body  12  and rear body  13 . 
         [0043]    A door  15  for opening and closing the space S may be rotatably connected to the cabinet  1 . The door  15  may be installed in plurality to divide and open the space S. 
         [0044]    The MCC includes a partition  16  located within the cabinet  1  and partitioning the inside of the cabinet  1 . 
         [0045]    The partition  16  may be horizontally located within the cabinet  1 . The partition  1  may be coupled to the side body  12  of the cabinet  1 . 
         [0046]    The partition  16  may be provided in plurality within the cabinet  1 , and the plurality of partitions  16  may be located to be spaced apart from each other vertically in the space S. The partition  16  may be installed such that a rear end thereof is spaced apart from the rear body  13 , and a gap may be provided between the rear end of the partition  16  and the rear body  13 . The partition  16  may be installed such that the rear end thereof is not in contact with the bus  2 . 
         [0047]    The bus  2  may be located to extend in a vertical direction within the cabinet  1 . The bus  2  may be located to be closer to the rear body  13 , among the door  15  and the rear body  13 . The bus  2  may be located on a rear side, among a front side and the rear side, within the cabinet  1 . 
         [0048]    The bus  2  may be connected to the MCC unit  3 . The bus  2  may be fixedly positioned in the cabinet  1 , and the MCC unit  3  may be moved from a front side of the bus  2  toward the bus  2  so as to be connected to the bus  2 . The bus  2  may be a vertical bus located to extend in a vertical direction in the space S. The bus  2  may be provided in plurality in the space S. The plurality of buses  2  may be located to be spaced apart from each other in a horizontal direction within the cabinet  1 . The plurality of buses  2  may be connected to the MCC units  3 , respectively. 
         [0049]    The MCC  3  unit may be a motor control unit controlling rotation of a motor by selectively supplying power required for the motor or changing a supply direction of power. 
         [0050]    The MCC unit  3  may be mounted on the partition  16 . In the MCC, a plurality of MCC units  3  may be installed in the cabinet  1 . 
         [0051]    Some of the plurality of MCC units  3  may be insertedly positioned between a pair of partitions  16 . An MCC unit positioned at the uppermost side, among the plurality of MCC units  3 , may be insertedly located between a partition  16  positioned at the uppermost side, among the plurality of partitions  16 , and the top cover  14 . An MCC unit positioned at the lowermost side, among the plurality of MCC units  3 , may be insertedly located between the case  11  and a partition  16  positioned at the lowermost side, among the plurality of partitions  16 . 
         [0052]    Hereinafter, for the purposes of description, a single MCC unit  3  will be described as an example. 
         [0053]    The MCC unit  3  may include a circuit breaker  31  interrupting an electric circuit and a drawer  32  in which the circuit breaker  31  is installed. 
         [0054]    The circuit breaker  31  may be configured as a molded case circuit breaker (MCCB). 
         [0055]    The drawer  32  may have a shape in which a front side, an upper side, and a rear side thereof are open. The drawer  32  may have a shape in which a lower side and left and right sides are closed. The drawer  32  may include a lower plate  33  and a pair of side plates  34 a and  34 b erected on the lower plate  33 . 
         [0056]    The MCC unit  3  may include a front door  35  opening and closing the front side of the drawer  32 . The front door  35  may be connected to rotate about one of left and right sides of the drawer  32 . 
         [0057]    The MCC unit  3  may further include a display assembly  36  installed on the drawer  32 . The display assembly  36  may include at least one lamp displaying operation information of the MCC unit  3 . 
         [0058]    The MCC unit  3  may include a clip  37  connected to the bus  2 . As illustrated in  FIG. 3 , the clip  37  may include a clip member  38  and a clip case  39  surrounding an outer circumference of the clip member  38 . The clip  37  may be installed in a position on a rear side within the drawer  32 . The clip  37  may be installed in the lower plate  33 . 
         [0059]    The MCC unit  3  may be mounted on the partition  16 , and when the MCC unit  3  is moved in a direction toward the bus  2 , the clip  37  may be connected to the bus  2 . In the MCC unit  3 , the clip  37  may be connected to the bus  2   
         [0060]      FIG. 4  is a bottom view of an MCC unit of an MCC according to an embodiment of the present disclosure,  FIG. 5  is a perspective view illustrating an upper surface of a partition plate of an MCC according to an embodiment of the present disclosure,  FIG. 6  is a plan view illustrating a configuration in which a first guide illustrated in  FIG. 4  is slidably mounted on a second guide illustrated in  FIG. 5 ,  FIG. 7  is a perspective view illustrating a state in which the first guide illustrated in  FIG. 4  is slidably mounted on the second guide illustrated in  FIG. 5 ,  FIG. 8  is a cross-sectional view illustrating a state in which the first guide illustrated in  FIG. 4  is slidably mounted on the second guide illustrated in  FIG. 5 , and  FIG. 9  is a cross-sectional view illustrating a state in which an MCC unit of an MCC is completely mounted on a guide rail according to an embodiment of the present disclosure. 
         [0061]    The MCC may include a first guide  60  located on a lower surface of the MCC unit  3  and a second guide  70  located on an upper surface of the partition  16  and slidably guiding the first guide  60  in a forward/backward direction. 
         [0062]    The first guide  60  may be located on a lower surface of the MCC unit  3 . The first guide  60  may be located to extend in a forward/backward direction. 
         [0063]    The first guide  60  may be provided in plurality on a lower surface of the MCC unit  3 . The plurality of first guides  60  may be located in a horizontal position and a vertical position different to each other on the lower surface of the MCC unit  3  (please refer to  FIG. 4 ). 
         [0064]    The first guide  60  may be fastened to the lower plate  33  of the MCC unit  3  through a fastening member such as a screw, or the like. 
         [0065]    The first guide  60  may be provided to extend in a forward/backward direction. Referring to  FIGS. 4 and 7 , a rear through hole  62  through which a fastening member  61  such as a screw, or the like, penetrates may be provided in the first guide  60 . A front through hole  64  through which a fastening member  63  such as a screw, or the like, penetrates may be provided in the first guide  60 . The rear through hole  62  and the front through hole  64  may be spaced apart from each other in a forward/backward direction. 
         [0066]    Referring to  FIGS. 6 to 8 , the first guide  60  may include a main body part  65  and a protrusion part  66  protruding from the main body part  65 . 
         [0067]    The main body part  65  may include the rear through hole  62  and the front through hole  64 , and may be fastened to the MCC unit  3  through a fastening member such as a screw, or the like. 
         [0068]    The main body part  65  may be provided to extend in a forward/backward direction. The rear through hole  62  and the front through hole  64  may be provided to extend in a forward/backward direction in the main body part  65 . 
         [0069]    The protrusion part  66  may protrude from a side surface of the main body part  65 . The protrusion part  66  may protrude in a lateral direction from a lower portion of the main body part  65 . The protrusion part  66  may be provided to protrude in a leftward direction and a rightward direction from side surfaces of a lower portion of the main body part  65 . The protrusion part  66  may be provided to be stepped in the main body part  65 . The protrusion part  66  may protrude to be stepped on a side surface of the main body part  65 . 
         [0070]    The protrusion part  66  may be provided to extend along an outer circumference of the main body part  65 . A height H 1  of the protrusion part  66  may be lower than a height H 2  of the main body part  65 . 
         [0071]    The main body part  65  may be fastened to the MCC unit  3  such that an upper surface thereof is in contact with a lower surface  3   a  of the MCC unit  3 . 
         [0072]    The main body part  65  may be inserted into a pair of side guides  73  and  74  (to be described hereinafter) of the second guide  70 . 
         [0073]    The protrusion part  66  may be spaced apart from the lower surface  3   a  of the MCC unit  3  below the lower surface of the MCC unit  3  in a vertical direction. 
         [0074]    The protrusion part  66  may include a left protrusion part  66   a  formed to protrude from the main body part  65  in a leftward direction and a right protrusion part  66   d  protruding from the main body part  65  in a rightward direction. 
         [0075]    The protrusion part  66  may be positioned between rise limiting parts  71  and  72  (to be described hereinafter) and the partition  16 . 
         [0076]    The second guide  70  is located in plurality on an upper surface of the partition. The second guide  70  may be provided by the same number as that of the first guide  60 , and maybe provided in a position corresponding to a position where the first guide  60  is located on the upper surface of the partition  16 . Thus, when the first guide  60  and the second guide  70  are coupled, the first guide  60  and the second guide  70  form three-point support on the coupled planar surface, securing stable bearing capacity. That is, a resistance force may be provided with respect to a force in a certain direction. 
         [0077]    The second guide  70  may have the rise limiting parts  71  and  72  limiting rising of the protrusion part  66 . 
         [0078]    The second guide  70  may include a pair of side guides  73  and  74  facing each other and a rear stopper  75  linking rear ends of the pair of side guides  73  and  74 . 
         [0079]    A first guide accommodation space  76  accommodating a first guide may be provided between the pair of side guides  73  and  74 . 
         [0080]    The rise limiting parts  71  and  72  may be provided in the pair of the side guides  73  and  74 , respectively. 
         [0081]    The pair of side guides and the rear stopper  75  may be located to be in contact with an upper surface of the partition  16  in lower surfaces thereof. 
         [0082]    Through holes  73   a  and  74   a  allowing the second guide  70  to be fastened to the partition  16  by a fastening member such as a screw, or the like, may be provided on the pair of side guides  73  and  74 , respectively. 
         [0083]    The rise limiting parts  71  and  72  may be spaced apart from an upper surface  16   a  of the partition  16  in a vertical direction on the upper surface  16   a  of the partition  16 . 
         [0084]    The rise limiting parts  71  and  72  may include a left rise limiting part  71  and the right rise limiting part  72 . 
         [0085]    The left rise limiting part  71  may protrude from a right upper portion of the left guide  73  positioned on the left side in a direction toward a left upper portion of the right guide  74  positioned on the right side. 
         [0086]    When the first guide  60  is completely slide to the second guide  70 , the left rise limiting part  71  may be positioned on the left protrusion part  66   a , and when the left protrusion part  66   a  is moved in an upward direction, the left protrusion part  66   a  may be caught in an upward direction. 
         [0087]    The sum of thicknesses of the left rise limiting part  71  and the left protruding part  66   a  may be equal to or greater than the height H 2  of the main body part  65 . Thus, when the first guide  60  slides to the second guide  70 , the first guide  6  is shrink-fit to the second guide  70 , so that the MCC unit  3  may be stably positioned, without being delaminated from the partition  16 . 
         [0088]    The right rise limiting part  72  may protrude from a left upper portion of the right guide  74  in a direction toward a right upper portion of the left guide  73 . 
         [0089]    When the first guide  60  completely slides to the second guide  70 , the right rise limiting part  72  may be positioned on the right protrusion part  66   d , and when the right protrusion part  66   d  is moved in an upward direction, the right protrusion part  66   d  may be caught in the upward direction. 
         [0090]    The sum of thicknesses of the right rise limiting part  72  and the right protruding part  66   d  may be equal to or greater than the height H 2  of the main body part  65 . Thus, when the first guide  60  slides to the second guide  70 , the first guide  6  is shrink-fit to the second guide  70 , so that the MCC unit  3  may be stably positioned, without being delaminated from the partition  16 . 
         [0091]    The left rise limiting part  71  and the right rise limiting part  72  may be provided such that thicknesses thereof are reduced toward each other. As for the left rise limiting part  71  and the right rise limiting part  72 , a lower surface  72   a  may be formed to be sloped. 
         [0092]    Meanwhile, the MCC may further include guide rails  80  and  90  installed on an upper surface of the partition  16  and guiding sliding of the MCC unit  3  in a forward/backward direction. Also, side protrusions  34   c  and  34   d  may protrude from side surfaces of the MCC unit  3 . 
         [0093]    Referring to  FIG. 9 , the side protrusions  34   c  and  34 d may include a left protrusion  34   c  and a right protrusion  34   d.    
         [0094]    The left protrusion  34   c  may be formed to protrude from a left plate  34   a  positioned on the left side, among a pair of side plates  34   a  and  34   b , in a leftward direction. 
         [0095]    The right protrusion  34   d  may be formed to protrude from the right plate  34   a  positioned on the right side, among the side plates  34   a  and  34   b , in a rightward direction. 
         [0096]    The guide rails  80  and  90  may be located to extend in a forward/backward direction. The guide rails  80  and  90 , as a pair, may be spaced apart from each other in a horizontal direction. The pair of guide rails  80  and  90  may include a left guide rail  80  positioned on the left side and a right guide rail  90  positioned on the right side. 
         [0097]    The guide rails  80  and  90  may have guide slits  82  and  92  slidably guiding the side protrusions  34   c  and  34   c  in a forward/backward direction, respectively. 
         [0098]    The guide slits  82  and  92  may be formed to extend in a forward/backward direction from front ends of the guide rails  80  and  90 , respectively. The guide slits  82  and  92  may be formed such that front ends thereof are open and rear ends thereof are closed, respectively. 
         [0099]    The left guide slit  82  may be formed to extend in a forward/backward direction in the left guide rail  80 . Also, the right guide slit  92  may be formed to extend in a forward/backward direction in the right guide rail  90 . The left guide slit  82  and the right guide slit  92  may be provided to face each other in a horizontal direction. 
         [0100]    Hereinafter, operations of the present disclosure configured as described above will be described. 
         [0101]    First, as illustrated in  FIG. 2 , the MCC unit  3  may be slidably mounted on the partition  16 , and may enter between the pair of guide rails  80  and  90 . 
         [0102]    When the MCC unit  3  is installed, the first guide  60  installed on a lower surface of the MCC unit  3  may enter the second guide  70  installed on an upper surface of the partition  16  and may be slidably guided to the second guide  70  in a backward direction. Also, when the MCC unit  3  is installed, the side protrusions  34   c  and  34   d  of the MCC unit  3  enter the guide slits  82  and  92  of the guide rails  80  and  90  so as to be slidably guided in a backward direction along the guide slits  82  and  92 , respectively. 
         [0103]    Hereinafter, a process of causing the first guide  60  to slide to the second guide  70  will be described in detail. 
         [0104]    First, in a state in which the first guide  60  is fastened to the lower plate  33  of the MCC unit  3  by a fastening member such as a screw, or the like, the first guide  60  may slide together with the MCC unit  3  on an upper surface of the partition  16 . 
         [0105]    The first guide  60  may be inserted into the second guide  70 . The first guide  60  may slide between the pair of side guides  73  and  74  and may be guided by the pair of side guides  73  and  74  in a backward direction. The first guide  60  may not be released in a leftward direction due to the presence of the left guide  73  and may not be released in a rightward direction due to the presence of the right guide  74 . Also, the protrusion part  66  of the first guide  60  may not be released in an upward direction due to the presence of the rise limiting parts  71  and  72  and may not be released in a downward direction due to the presence of the partition  16 . Also, when the first guide  60  is inserted in the back of the second guide  70 , the first guide  60  is not released in a backward direction due to the presence of the rear stopper  75 . 
         [0106]    When the first guide  60  is inserted into the first guide accommodation space  76  of the second guide  70 , the first guide  60  may be separated only in a forward direction and a movement thereof in a leftward direction, a rightward direction, an upward direction, and a downward direction, and a backward direction may be limited. 
         [0107]    The foregoing embodiments and advantages are merely exemplary and are not to be considered as limiting the present disclosure. The present teachings can be readily applied to other types of apparatuses. This description is intended to be illustrative, and not to limit the scope of the claims. Many alternatives, modifications, and variations will be apparent to those skilled in the art. The features, structures, methods, and other characteristics of the exemplary embodiments described herein may be combined in various ways to obtain additional and/or alternative exemplary embodiments. 
         [0108]    As the present features may be embodied in several forms without departing from the characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be considered broadly within its scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalents of such metes and bounds are therefore intended to be embraced by the appended claims.

Technology Category: 5