Patent Publication Number: US-11639812-B2

Title: Air conditioner

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 16/988,088 filed on Aug. 7, 2020, now U.S. Pat. No. 11,079,135, which is a continuation of U.S. patent application Ser. No. 16/820,927 filed on Mar. 17, 2020, now U.S. Pat. No. 10,760,818, which is continuation of U.S. patent application Ser. No. 15/627,786 filed on Jun. 20, 2017, now U.S. Pat. No. 10,612,814, which is a continuation of U.S. patent application Ser. No. 15/146,197 filed on May 4, 2016, now U.S. Pat. No. 9,714,773, which claims the benefit of Korean Patent Application Nos. 10-2015-0148300, filed on Oct. 23, 2015, and 10-2016-0036357, filed on Mar. 25, 2016, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference. 
    
    
     BACKGROUND 
     1. Field 
     Embodiments of the present disclosure relate to a suction panel and a cover member for forming a suction port of an air conditioner. 
     2. Description of the Related Art 
     An air conditioner is an apparatus which includes a compressor, a condenser, an expansion valve, an evaporator, an air blowing fan, etc. and control an indoor temperature, indoor humidity, an indoor air flow, etc. using a cooling cycle. Air conditioners may be divided into a separated type which includes an indoor unit disposed indoors and an outdoor unit disposed outdoors and an integrated type which includes both an indoor unit and an outdoor unit disposed in a single housing. 
     An indoor unit of an air conditioner includes a heat exchanger which thermally exchanges a refrigerant with air, an air blowing fan which moves air, and a motor which drives the air blowing fan to cool or heat a room. 
     Indoor units of air conditioners suction indoor air to perform a heat exchange using heat exchangers, and discharge the thermally exchanged air. Here, filters may be disposed in suction ports through which air is suctioned so as to discharge, suction, and discharge fresh air. 
     Users may maintain a clean state of indoor air by regularly cleaning the filters, by separating suction panels at which suction ports are provided to remove the filters to the outside of air conditioners to clean the filters. 
     Particularly, in the case of a ceiling-embedded air conditioner, it is difficult for users to separate suction panels disposed at high positions. 
     SUMMARY 
     Therefore, it is an aspect of the present disclosure to provide an air conditioner which allows a user to easily separate a suction panel. 
     It is another aspect of the present disclosure to provide an air conditioner which allows a user to easily couple a cover member. 
     It is another aspect of the present disclosure to provide an air conditioner which includes a circular filter. 
     Additional aspects of the present disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present disclosure. 
     In accordance with one aspect of the present disclosure, an air conditioner includes a housing, a heat exchanger provided inside the housing, and a suction panel which includes a suction port and has a circular shape. Here, the suction panel is configured to rotate with respect to the housing in a circumferential direction of the suction panel and to be separably coupled with the housing. 
     The suction panel may include a coupling member provided on one side of the suction panel to be inserted into and coupled with the housing, and the housing may include a coupling portion which supports the coupling member inserted into the housing. 
     A plurality of such coupling members may be arranged in the circumferential direction of the suction panel, and a plurality of such coupling portions may be provided corresponding to the plurality of coupling members. 
     The coupling member may include a guide surface which guides the coupling member to the coupling portion and includes a curved surface and an insertion protrusion which protrudes from one side of the guide surface and is supported by the coupling portion. 
     A filter to be separably coupled with the suction panel may be disposed on a side on which the coupling member of the suction panel is provided, and the coupling member may further include a hook which supports at least one side of the filter. 
     The coupling portion may include a guide groove which guides an insertion and a withdrawal of the coupling member, an insertion groove into which the coupling member is inserted, and a supporting step which supports the inserted coupling member. 
     The housing may include an upper housing which covers the heat exchanger and a lower housing disposed on one side of the heat exchanger. The lower housing may include a first lower housing, which includes one side adjacent to the heat exchanger, and a second lower housing disposed on the other side of the first lower housing. The guide groove may be provided in the second lower housing, and the insertion groove and the supporting step may be provided in the first lower housing. 
     The air conditioner may further include a supporting unit which includes a connecting member connecting one side of the suction panel with one side of the housing so as to support the suction panel while the suction panel is spaced apart from the housing when the suction panel is separated from the housing. 
     The air conditioner may further include a supporting unit which includes a link member connecting the suction panel with the housing so as to support the suction panel while the suction panel is spaced apart from the housing when the suction panel is separated from the housing, and a slide slit provided in each of the suction panel and the housing to allow both ends of the link member to slide with respect to the suction panel and the housing. 
     The housing may be provided in a cylindrical shape. The heat exchanger may be provided in an annular shape. The housing may include a discharge port which is located between an inner circumferential surface of the housing and an outer circumferential surface of the heat exchanger and includes a circular arc shape. The suction panel may be provided inside the discharge port in a radial direction. 
     In accordance with another aspect of the present disclosure, an air conditioner includes a housing including a cylindrical shape, a heat exchanger provided inside the housing, a drain tray disposed to collect condensate water generated by the heat exchanger, and a cover member which covers an outer perimeter of the housing and includes a circular opening. Here, the cover member is coupled with at least one of the housing and the drain tray and is provided to be rotatable with respect to the housing in a circumferential direction. 
     The housing and the drain tray may include a first assembling portion and a second assembling portion which protrude outward from outer circumferential surfaces thereof and are disposed at corresponding positions to overlap with each other, respectively. A recessed portion may be formed in at least one of the first assembling portion and the second assembling portion to be concave in an axial direction of the housing. 
     The cover member may include a coupling hook capable of being hook-coupled with at least one of the first assembling portion and the second assembling portion. The recessed portion may have a larger width than a width of the coupling hook. The cover member may rotate as much as a difference between the widths of the recessed portion and the coupling hook to control a gap. 
     The cover member may include a coupling slit which includes a longitudinal portion which extends in a circumferential direction of the circular opening. The cover member may be coupled with at least one of the first assembling portion and the second assembling portion and then may rotate as much as a length of the longitudinal portion to control a gap. 
     The cover member may rotate in the circumferential direction of the housing and may be supported by at least one of the first assembling portion and the second assembling portion. 
     A coupling protrusion which protrudes inward in a radial direction of the cover member may be provided at an inner circumferential surface of the cover member, and the coupling protrusion may be supported by and coupled with at least one of the first assembling portion and the second assembling portion when disposed in a position overlapping the first and second assembling portions. 
     The cover member may further include an auxiliary coupling protrusion which protrudes inward in the radial direction of the cover member to be coupled with one side of the recessed portion when supported by the at least one of the first assembling portion and the second assembling portion. 
     The cover member may be selectable from cover members in different shapes, and the recessed portion is coupled with the selected cover member. 
     The selected cover member may include a coupling hook coupled with the recessed portion, and the recessed portion may have a larger width than a width of the coupling hook to control a gap. 
     The selected cover member may include a coupling protrusion supported by at least one of the first and second assembling portions and an auxiliary coupling protrusion coupled with the recessed portion to limit rotating of the cover member. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects of the present disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG.  1    is a perspective view of an indoor unit of the air conditioner in accordance with one embodiment of the present disclosure; 
         FIG.  2    is a cross-sectional view illustrating a portion taken along line I-I shown in  FIG.  1   ; 
         FIG.  3    is an exploded perspective view of the air conditioner in accordance with one embodiment of the present disclosure; 
         FIG.  4    is a rear view illustrating a state in which a second lower housing of the air conditioner in accordance with one embodiment of the present disclosure is removed; 
         FIG.  5    is an enlarged view of a part shown in  FIG.  2   ; 
         FIG.  6    is a view illustrating a shape of a separated suction panel of the air conditioner in accordance with one embodiment of the present disclosure; 
         FIG.  7    is a rear view of the air conditioner in accordance with one embodiment of the present disclosure from which the suction panel is removed; 
         FIG.  8    is a top view of the suction panel of the air conditioner in accordance with one embodiment of the present disclosure; 
         FIG.  9    is a view of a coupling member of the air conditioner in accordance with one embodiment of the present disclosure; 
         FIG.  10    is a view illustrating a state in which the filter is coupled with the coupling member of the air conditioner in accordance with one embodiment of the present disclosure; 
         FIG.  11    is a view of the coupling portion of the air conditioner in accordance with one embodiment of the present disclosure; 
         FIG.  12    is an exploded perspective view of the lower housing of the air conditioner in accordance with one embodiment of the present disclosure; 
         FIG.  13    is a view of a supporting unit of the air conditioner in accordance with one embodiment of the present disclosure; 
         FIG.  14    is an exploded perspective view of a supporting unit of an air conditioner in accordance with another embodiment of the present disclosure; 
         FIG.  15    is a side cross-sectional view schematically illustrating the air conditioner in accordance with another embodiment of the present disclosure; 
         FIG.  16    is a side cross-sectional view schematically illustrating a state in which a suction panel of the air conditioner in accordance with another embodiment of the present disclosure is coupled with a housing; 
         FIG.  17    is an exploded perspective view of a supporting unit of an air conditioner in accordance with another embodiment of the present disclosure; 
         FIG.  18    is a side cross-sectional view schematically illustrating a suction panel of the air conditioner in accordance with another embodiment of the present disclosure when being separated; 
         FIG.  19    is a side cross-sectional view schematically illustrating the suction panel of the air conditioner in accordance with another embodiment of the present disclosure when being coupled; 
         FIG.  20    is a perspective view illustrating a suction panel of an air conditioner in accordance with another embodiment of the present disclosure when being separated; 
         FIG.  21    is a side cross-sectional view schematically illustrating the suction panel of the air conditioner in accordance with another embodiment of the present disclosure when being separated; 
         FIG.  22    is a view illustrating a state in which a suction panel of an air conditioner in accordance with another embodiment of the present disclosure when being separated; 
         FIG.  23    is a view illustrating a state in which a cover member in accordance with one embodiment of the present disclosure is separated; 
         FIG.  24    is a partial view illustrating a state in which the air conditioner in accordance with one embodiment of the present disclosure is coupled; 
         FIG.  25    is a partial enlarged top view of the cover member in accordance with one embodiment of the present disclosure; 
         FIG.  26    is a view illustrating a rotation state of the cover member in accordance with one embodiment of the present disclosure; 
         FIG.  27    is a partial enlarged view of a cover member in accordance with another embodiment of the present disclosure; 
         FIG.  28    is a side cross-sectional view illustrating a state in which the cover member in accordance with another embodiment of the present disclosure is separated from the air conditioner; 
         FIG.  29    is a view illustrating a state in which a cover member in accordance with another embodiment of the present disclosure is separated; 
         FIG.  30    is a view illustrating a state in which the cover member in accordance with another embodiment of the present disclosure is coupled; 
         FIG.  31    is a perspective view of the cover member in accordance with another embodiment of the present disclosure; 
         FIGS.  32 A and  32 B  are top views illustrating a state in which the cover member in accordance with another embodiment of the present disclosure is coupled; 
         FIG.  33    is a partial perspective view of a filter in accordance with one embodiment of the present disclosure; 
         FIG.  34    is a top view of the filter in accordance with one embodiment of the present disclosure; and 
         FIG.  35    is a partial enlarged view of the filter in accordance with one embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments described herein and configurations shown in the drawings are merely exemplary examples. Also, various modified examples with which these embodiments and the drawings could be replaced may be present at the time of filing of the present application. 
     Also, throughout the drawings, like reference numerals designate like elements. 
     Also, the terms used herein explain the embodiments but are not intended to restrict and/or limit the present disclosure. Singular expressions, unless defined otherwise in context, include plural expressions. Throughout the specification, the terms “comprise” and “have”, etc. are used herein to specify the presence of stated features, numbers, steps, operations, elements, components or combinations thereof but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof. 
     Also, it should be understood that although the terms “first”, “second”, etc. may be used herein to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another. For example, without departing from the scope of the present disclosure, a first component may be referred to as a second component, and similarly, the second component may be referred to as the first component. The term “and/or” includes any and all combinations of one or a plurality of associated listed items. 
     Also, ‘upper’, ‘upward’, ‘lower’, and ‘downward’ used herein refer to a vertical direction of an air conditioner in accordance with one embodiment of the present disclosure shown in  FIG.  1   . That is, a side on which a suction port of the air conditioner is provided is referred to as a lower side and a side thereabove is referred to as an upper side. 
     Also, the embodiment is not to be limited to one embodiment of the present disclosure but may be applied to an air conditioner which includes blades. 
     Also, the air conditioner in accordance with one embodiment of the present disclosure includes a heat exchanger in an annular shape but is not limited thereto and may be applied to air conditioners which include heat exchangers in a quadrangular shape or various shapes. 
     Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. 
       FIG.  1    is a perspective view of an indoor unit of the air conditioner in accordance with one embodiment of the present disclosure.  FIG.  2    is a cross-sectional view illustrating a portion taken along line I-I shown in  FIG.  1   .  FIG.  3    is an exploded perspective view of the air conditioner in accordance with one embodiment of the present disclosure.  FIG.  4    is a rear view illustrating a state in which a second lower housing of the air conditioner in accordance with one embodiment of the present disclosure is removed.  FIG.  5    is an enlarged view of a part shown in  FIG.  2   . 
     Referring to  FIGS.  1  and  5   , a schematic configuration of the air conditioner in accordance with one embodiment of the present disclosure will be described. 
     An indoor unit  1  of the air conditioner may be installed on a ceiling L. At least a portion of the indoor unit  1  of the air conditioner may be embedded in the ceiling L. 
     The indoor unit  1  of the air conditioner includes a housing  10  which includes a suction port  110  and a discharge port  33 , a heat exchanger  80  provided inside the housing  10 , and an air blowing fan  40  which moves air. 
     The housing  10  may have an approximately circular shape when viewed from above or below. The housing  10  may include an upper housing  20  disposed inside the ceiling L and a lower housing  30  coupled below the upper housing  20 . 
     A suction panel  100  which includes the suction port  110  through which air is suctioned may be provided in a central portion of the lower housing  30 , and the discharge port  33  through which the air is discharged may be formed outside the suction port  110  in a radial direction. The discharge port  33  may have an approximately circular shape when viewed from above or below. 
     The lower housing  30  may include a first lower housing  31  which is coupled with the upper housing  20  and forms the discharge port  33  and a second lower housing  32  which covers a lower side of the first lower housing  31 . 
     As shown in  FIG.  5   , the first lower housing  31  may include three components. However, it may be provided with a plurality of components for ease of assembly in a process but may be formed as a single component. 
     In the structure described above, the indoor unit  1  of the air conditioner may suction air from a lower side to cool or heat and may discharge the air through the lower side. 
     A filter  120  may be coupled with an upper side of the suction panel  100  to filter out dust from the air suctioned through the suction port  110 . 
     The heat exchanger  80  may have an approximately circular shape when viewed from above or below. 
     The heat exchanger  80  may be disposed at a drain tray  90  to allow condensed water generated by the heat exchanger  80  to be collected at the drain tray  90 . 
     The air blowing fan  40  may be provided inside the heat exchanger  80  in a radial direction. The air blowing fan  40  may be a centrifugal fan which suctions air in an axial direction and discharges the air in the radial direction. The indoor unit  1  of the air conditioner may include an air blowing motor  41  for driving the air blowing fan  40 . 
     Due to the components described above, the indoor unit  1  of the air conditioner may suction, cool, and discharge indoor air into a room or may suction, heat, and discharge indoor air into the room 
     The indoor unit  1  of the air conditioner further includes an air flow controller  50  which controls a discharged air flow. 
     The air flow controller  50  may suction air around the discharge port  33  and change a pressure thereof, and thereby control a direction of the discharged air flow. Also, the air flow controller  50  may control a suction rate of the air around the discharge port  33 . That is, the air flow controller  50  may control the direction of the discharged air flow by controlling the suction rate of the air around the discharge port  33 . 
     Here, the controlling of the direction of the discharged air flow refers to controlling an angle of the discharged air flow. 
     The air flow controller  50  may suction the air from one side of a movement direction of the discharged air flow when suctioning the air around the discharge port  33 . 
     That is, as shown in  FIG.  5   , when the movement direction of the discharged air flow while the air flow controller  50  does not operate is a direction A 1 , the air flow controller  50  operates and suctions the air from one side of the direction A 1 , thereby switching the movement direction of the discharged air flow into a direction A 2 . 
     Here, an angle to be switched may be adjusted according to a suction rate. That is, switching may be performed at a small angle when the suction rate is low and may be performed at a large angle when the suction rate is high. 
     The air flow controller  50  may discharge the suctioned air toward an opposite side of the movement direction A 1  of the discharged air flow. Thereby, the angle of the discharged air flow may become larger and an air flow may be more smoothly controlled. 
     The air flow controller  50  may suction air at the outside of the discharge port  33  in a radial direction. As described above, since the air flow controller  50  suctions the air at the outside of the discharge port  33  in the radial direction, the discharged air flow may widely spread from a central portion of the discharge port  33  to the outside in the radial direction. 
     The air flow controller  50  includes an air flow controlling fan  60  which generates a suction force for suctioning the air around the discharge port  33 , an air flow controlling motor  61  for driving the air flow controlling fan  60 , and a guide flow path  70  which guides the air suctioned by the air flow controlling fan  60 . 
     The air flow controlling fan  60  may be accommodated inside the lower housing  30 . In detail, the air flow controlling fan  60  may be provided in an internal space of the lower housing  30  formed by the first lower housing  31  and the second lower housing  32 . 
     In the embodiment, three such air flow controlling fans  60  are provided at angles of 120 degrees, but the number thereof is not limited thereto. The number and arrangement of the air flow controlling fans  60  may be variously designed. 
     Also, in the embodiment, the air flow controlling fan  60  is a centrifugal fan, but is not limited thereto, and may be one of various fans such as an axial flow fan, a cross flow fan, a diagonal flow fan, etc. according to design specifications. 
     The guide flow path  70  connects an inlet  71  which suctions the air around the discharge port  33  with an outlet  72  which discharges the suctioned air. 
     The inlet  71  may be formed on an outer circumferential surface of the discharge port  33 , and the outlet  72  may be provided on an inner circumferential surface of the discharge port  33  opposite to the inlet  71 . That is, the inlet  71  and the outlet  72  may be provided on the lower housing  30  which forms the discharge port  33 . 
     Due to these components, as described above, the air flow controller  50  may discharge suctioned air to the opposite side of the movement direction A 1  of the discharged air flow, may increase the angle of the discharged air flow, and may more smoothly control an air flow. 
     The guide flow path  70  may include a first flow path  70   a  formed in a circumferential direction of the lower housing  30  and connected to the inlet  71 , a second flow path  70   b  which extends from the first flow path  70   a  to an inside in a radial direction, and a third flow path  70   c  formed in an area in which the air flow controller  60  is mounted. 
     Accordingly, air suctioned through the inlet  71  may pass through the first flow path  70   a , the second flow path  70   b , and the third flow path  70   c  and may be discharged through the outlet  72 . 
     However, such a structure of the guide flow path  70  is merely an example and the guide flow path  70  is not limited in structure, shape, and arrangement while connecting the inlet  71  with the outlet  72 . 
     Due to these components, an indoor unit of an air conditioner in accordance with one embodiment of the present disclosure may control a discharged air flow without a blade structure in comparison to a conventional structure which includes a blade in a discharge port and controls a discharged air flow by rotating the blade. Accordingly, as an interruption caused by a blade is absent, a discharge rate may increase and a flow noise may be reduced. 
     Also, the discharge port of the indoor unit of the conventional air conditioner has to have a linear shape to rotate the blade. The discharge port of the indoor unit of the air conditioner in accordance with the embodiment of the present disclosure may be provided in a circular shape. 
     Also, the discharge port of the indoor unit of the conventional air conditioner has to have a linear shape to rotate the blade. However, the discharge port of the indoor unit of the air conditioner in accordance with the embodiment of the present disclosure may be provided in a circular shape. Accordingly, since the housing, the heat exchanger, etc. may also be provided in circular shapes, aesthetic properties may increase due to a differentiated design. Also, considering that a shape of the air blowing fan is generally circular, an air flow may naturally flow and a loss in pressure may be reduced and cooling or heating properties of the air conditioner may be increased. 
     Hereinafter, the suction panel  100  and combination and separation between the suction panel  100  and the lower housing  30  will be described in detail. 
       FIG.  6    is a view illustrating a shape of a separated suction panel of the air conditioner in accordance with one embodiment of the present disclosure.  FIG.  7    is a rear view of the air conditioner in accordance with one embodiment of the present disclosure from which the suction panel is removed.  FIG.  8    is a top view of the suction panel of the air conditioner in accordance with one embodiment of the present disclosure.  FIG.  9    is a view of a coupling member of the air conditioner in accordance with one embodiment of the present disclosure.  FIG.  10    is a view illustrating a state in which the filter is coupled with the coupling member of the air conditioner in accordance with one embodiment of the present disclosure.  FIG.  11    is a view of the coupling portion of the air conditioner in accordance with one embodiment of the present disclosure.  FIG.  12    is an exploded perspective view of the lower housing of the air conditioner in accordance with one embodiment of the present disclosure.  FIG.  13    is a view of a supporting unit of the air conditioner in accordance with one embodiment of the present disclosure. 
     As shown in  FIG.  6   , the suction panel  100  may be rotated with respect to the lower housing  30  and may be separably coupled with the lower housing  30 . That is, when a user applies a force which rotates the suction panel  100  in an axial direction of the air blowing fan  40  or rotates it clockwise or counterclockwise with the vertical direction of the indoor unit  1  of the air conditioner as an axis, the suction panel  100  may be rotated in a force-applied direction and may be separated from or coupled with the lower housing  30 . 
     In accordance with one embodiment of the present disclosure, when the suction panel  100  is rotated clockwise on a rotation axis of the air blowing fan  40  based in a direction in which the user faces the indoor unit  1  of the air conditioner installed in the ceiling L, the suction panel  100  may be coupled with the lower housing  30 . When rotated counterclockwise, the suction panel  100  may be separated from the lower housing  30 . However, combination and separation are not limited thereto, and combination and separation may be performed by applying the force in the opposite direction. 
     As shown in  FIGS.  7  to  12   , a coupling member  130  to be coupled with the lower housing  30  may be provided above the suction panel  100  and a coupling portion  35  provided on a side corresponding to the coupling member  130  may be provided at the lower housing  30 . 
     There may be two or more of each of the coupling member  130  and the coupling portion  35  corresponding thereto, and more preferably, a plurality of such coupling members  130  and a plurality of coupling portions  35  may be arranged on an inner surface adjacent to a rim of the suction panel  100  in a circumferential direction of the suction panel  100 . 
     Hereinafter, a single unit of each of the plurality of coupling members  130  and the plurality of coupling portions  35  will be described. Since the plurality of coupling members  130  and the plurality of coupling portions  35  are provided in the same shapes, a description of the plurality thereof will be omitted. 
     The coupling member  130  may be provided as a protrusion which protrudes upward. In detail, the coupling member  130  may include a first hook  131  inserted into and supported by the coupling portion  35 . 
     The first hook  131  may include a guide surface  132 , which guides the first hook  131  to be inserted into the coupling portion  35  and has a round shape, and an insertion protrusion  133 , which laterally extends from the guide surface  132  and is inserted into and hook-coupled with the coupling portion  35 . 
     The coupling portion  35  may be concavely formed inside the lower housing  30  to allow the first hook  131  to be inserted into the lower housing  30 . In detail, the coupling portion  35  may include a guide groove  36  provided to be in contact with the insertion protrusion  133  and the guide surface  132  while being coupled with the first hook  131  to allow the insertion protrusion  133  to be inserted into the coupling portion  35 , an insertion groove  37  into which the guided insertion protrusion  133  is inserted, and a supporting step  38  with which the insertion protrusion  133  inserted into the insertion groove  37  is hook-coupled to be supported thereby. 
     The guide groove  36  may allow the coupling member  130  to be easily inserted into the coupling portion  35  when the user couples the suction panel  100  with the lower housing  30 . For this, the guide groove  36  may have a larger width than a width of the guide surface  132 , and may be concavely provided. 
     Also, the guide groove  36  may extend toward the insertion groove  37  in a curved shape to allow the insertion protrusion  133  and the guide surface  132  to be easily moved to the insertion groove  37  while in contact with each other. 
     As described above, when the user rotates the suction panel  100  clockwise, the insertion protrusion  133  may be guided by the guide groove  36 , inserted into the insertion groove  37 , and hook-coupled with the supporting step  38 , thereby allowing the suction panel  100  to be coupled with the lower housing  30 . 
     On the other hand, when the user rotates the suction panel  100  counterclockwise, the insertion protrusion  133  may be separated from the supporting step  38  and sequentially withdrawn from the insertion groove  37  and the guide groove  36 , thereby allowing the suction panel  100  to be separated from the lower housing  30 . 
     When the suction panel  100  is provided as a circular shape like one embodiment of the present disclosure, since the user may separate and couple the suction panel  100  from and with the housing  10  by rotating the circular suction panel  100 , the suction panel  100  may be intuitively detached or attached using the circular shape, thereby providing convenience to the user. 
     The circular suction panel  100  may not only be applied to the indoor unit  1  of the air conditioner including the heat exchanger  80  provided in an annular shape like in the embodiment of the present disclosure but also be applied to cases of the heat exchanger  80  provided in a quadrangular shape or in various shapes and may be separated from the housing  10  through rotation and recoupled with the housing  10  through rotation as described above. 
     As shown in  FIG.  12   , the insertion groove  37  and the supporting step  38  may be provided at the first lower housing  31  and the guide groove  36  may be provided at the second lower housing  32 . This is to provide rigidity against a long-time stress which may occur at the insertion groove  37  and the supporting step  38  when the suction panel  100  is hook-coupled for a long time. 
     Three of the first lower housings  31 , as shown in  FIG.  5   , may be separably formed. However, in  FIG.  12   , for convenience of description, among a plurality of such lower housings  31 , only one first lower housing  31  disposed above is shown while two other first lower housings  31  are omitted. 
     The first lower housing  31 , which will be described below, is the one first lower housing  31  disposed above shown in  FIG.  12    among a plurality of first lower housings  31  shown in  FIG.  5   . However, the plurality of first lower housings  31 , unlike one embodiment of the present disclosure, may be separably provided, but are not limited thereto, and may be injection-molded as a single housing. 
     The first lower housing  31  may be coupled with the drain tray  90  inside the upper housing  20  to provide rigidity against gravity. However, since the second lower housing  32  is a component which covers the first lower housing  31  at the lower side thereof and is supported by the first lower housing  31 , rigidity thereof against a stress may be lower than that of the first lower housing  31 . 
     Accordingly, the second lower housing  32  may include the guide groove  36  and a through hole  32   a  to expose the insertion groove  37  and the supporting step  38  below the lower housing  30 . 
     However, when the second lower housing  32  has a certain level of rigidity, the insertion groove  37  and the supporting step  38  may be integrally provided at the second lower housing  32 . Here, the lower housing  30  may not include the through hole  32   a.    
     The coupling member  130  may include a second hook which faces inward in the radial direction of the suction panel  100 . In detail, the second hook  135  may be provided on a side of the coupling member  130 , which extends toward the guide surface  132 , and may be provided toward a central portion of a radius of the suction panel  100 . 
     As described above, the filter  120  may be disposed on an upper surface of the suction panel  100  at which an outer circumferential surface of the filter  120  may be hook-coupled with the second hook  135  to be supported by the suction panel  100 . 
     As the second hook  135  is provided on one side of the coupling member  130 , the suction panel  100  does not need an additional component for supporting a filter, thereby simplifying a process and reducing manufacturing costs. 
     The user may rotate the suction panel  100  to separate it from the housing  10  and then may easily separate the filter  120  from the suction panel  100  by pressurizing the filter  120  coupled with the second hook  135 . 
     Since the indoor unit  1  of the air conditioner is embedded in the ceiling, when the user separates the suction panel  100  from the ceiling, a safety accident such as falling of the suction panel  100  may occur due to a mistake of the user. To prevent this, the suction panel  100  may include a supporting unit  140  provided to allow the suction panel  100  to be supported by the housing  10  while the suction panel  100  is separated from the housing  10 . 
     The supporting unit  140  may connect the upper side of the suction panel  100  with the lower side of the lower housing  30  to allow the suction panel  100  to be supported by the lower housing  30  at a certain interval therebetween after being separated from the lower housing  30 . 
     As shown in  FIG.  13   , the supporting unit  140  may include a connecting member  141  which connects the suction panel  100  with the lower housing  30 , a first connecting groove  142  provided at the suction panel  100 , and a second connecting groove  143  provided at the lower housing  30 . 
     The connecting member  141  may be formed of a material including flexibility such as a wire, and may be disposed to be bent between the suction panel  100  and the lower housing  30  when the suction panel  100  is coupled with the lower housing  30 . 
     The connecting member  141  may allow the suction panel  100  to vertically extend due to tension generated between the lower housing  30  and the suction panel  100  and to be supported by the lower housing  30  when the suction panel  100  is separated. 
     The connecting member  141  may include a material having rigidity capable of supporting gravity acting on the suction panel  100 . 
     The first connecting groove  142  may be formed at the suction panel  100  and coupled with one side of the connecting member  141 . In detail, the first connecting groove  142  may be provided at one side of the guide surface  132  of the coupling member  130 , but is not limited thereto, and may be provided at one side of the upper surface of the suction panel  100 . 
     The second connecting groove  143  may be formed at the lower side of the lower housing  30  and may be coupled with the other side of the connecting member  141 . The second connecting groove  143 , as shown in  FIG.  12   , like the insertion groove  37  and the supporting step  38 , may extend from the first lower housing  31  and may protrude below the second lower housing  32 , but is not limited thereto, and may be provided at the second lower housing  32 . 
     Hereinafter, a supporting unit  240  in accordance with another embodiment of the present disclosure will be described. Hereinafter, since components other than a suction panel  200  and the supporting unit  240  to be described below are identical to components of one embodiment described above, a description thereof will be omitted. 
       FIG.  14    is an exploded perspective view of a supporting unit of an air conditioner in accordance with another embodiment of the present disclosure.  FIG.  15    is a side cross-sectional view schematically illustrating the air conditioner in accordance with another embodiment of the present disclosure.  FIG.  16    is a side cross-sectional view schematically illustrating a state in which a suction panel of the air conditioner in accordance with another embodiment of the present disclosure is coupled with a housing. 
     As shown in  FIG.  14   , the supporting unit  240  may include a link member  241  which connects the lower housing  30  with the suction panel  200 , a first slide slot  242  disposed at the suction panel  200 , and a second slide slot  243  disposed at the lower housing  30 . 
     The link member  241  may slide toward and be rotatably coupled with each of the lower housing  30  and the suction panel  200 . 
     Slide protrusions  244  which are inserted into the first and second slide slots  242  and  243  and slide may be provided at both ends of the link member  241 . 
     The slide protrusions  244  may slide in the first and second slide slots  242  and  243  when the suction panel  200  is rotated, and may rotate with respect to the first and second slide slots  242  and  243  to allow the link member  242  to pivot when the suction panel  200  is separated. 
     As shown in  FIG.  16   , when the suction panel  200  is coupled with the lower housing  30 , the link member  241  may be provided between the suction panel  200  and the lower housing  30  while being disposed in a direction perpendicular to a vertical direction. 
     After that, the slide protrusions  244  may slide in the first and second slide slots  242  and  243  in a direction being pressurized when the suction panel  200  is rotated and may slide according to rotation of the suction panel  200 . 
     When the rotation of the suction panel  200  is finished, the coupling member  130  is withdrawn from the coupling portion  35  to be separable. Here, the link member  241  may support the suction panel  200  while being disposed toward the vertical direction to support the suction panel  200  at a certain interval from the lower housing  30 . 
     The slide protrusions  244  rotate while being inserted into the first and second slide slots  242  and  243  to allow the link member  241  to be disposed in the vertical direction. The slide protrusions  244  may not only rotate but also continuously slide in the first and second slide slots  242  and  243  when the suction panel  200  is separated. 
     The suction panel  200  may be supported by the lower housing  30  while being spaced apart as much as a length of the link member  241 . 
     Hereinafter, a suction panel  300  in accordance with another embodiment of the present disclosure will be described. Hereinafter, since components in addition to the suction panel  300 , a coupling member  330 , and a supporting unit  340  to be described below are identical to components of one embodiment described above, a description thereof will be omitted. 
       FIG.  17    is an exploded perspective view of a supporting unit of an air conditioner in accordance with another embodiment of the present disclosure.  FIG.  18    is a side cross-sectional view schematically illustrating a suction panel of the air conditioner in accordance with another embodiment of the present disclosure when being separated.  FIG.  19    is a side cross-sectional view schematically illustrating the suction panel of the air conditioner in accordance with another embodiment of the present disclosure when being coupled. 
     As shown in  FIG.  17   , the suction panel  300  may be rotated in a direction perpendicular to the rotation axis of the air blowing fan  40  as a rotation axis to be separated from and coupled with the housing  10 . In detail, when the user pressurizes the suction panel  300  in a lower-side direction of the indoor unit  1  of the air conditioner, the suction panel  300  may rotate in the lower-side direction, which is the direction being pressurized, and may be separated from the lower housing  30 . 
     That is, unlike a method of pressurizing the suction panel  100 , 200  by the user in a circumferential direction of the suction panel  100 , 200  in accordance with one embodiment of the present disclosure shown in  FIGS.  6  to  16   , the suction panel  300 , 400  in accordance with another embodiment of the present disclosure shown in  FIGS.  17  to  19 , and  20  to  22    may be pressurized downward to be separated from the lower housing  30  and may be pressurized upward to be coupled with the lower housing  30 . 
     The coupling member  330  which connects the suction panel  300  with the lower housing  30  for coupling and separating them with or from each other may be provided between the suction panel  300  and the lower housing  30 . 
     The coupling member  330  may include a hook portion  331  provided at the suction panel  300  and a hook supporting portion (not shown) provided at the lower housing  30  to allow the hook portion  331  to be inserted and supported. 
     Two such hook portions  331  may be provided as shown in  FIG.  17   , but the hook portions are not limited thereto, and may be provided as a single hook portion or three or more hook portions. The hook portion  331  may be inserted into and hook-coupled with the hook supporting portion when the suction panel  300  is coupled with the lower housing  30 . 
     When the user pressurizes the suction panel  300  downward, the hook portion  331  may depart from the hook supporting portion in such a way that hook-coupling may be released and the suction panel  300  may be rotated downward. 
     The supporting unit  340  may include a link member  341  which supports the suction panel  300  at a certain interval from the lower housing  30  to allow the suction panel  300  to be rotated while being spaced apart at the certain interval from the lower housing  30 , a rotation-coupling portion  342  provided to allow the suction panel  300  to be vertically rotated, a rotating portion  344  which allows the link member  341  to be rotatable with respect to the lower housing  30 , and a hinge member  343  which limits a movement of the link member  341  to allow the link member  341  to support the suction panel  300  while maintaining the certain interval. 
     The link member  341  may include an annular shape corresponding to a rim of the suction panel  300 . In detail, the link member  341  may be formed in an annular shape of a semicircular shape of the suction panel  300 . 
     Rotating portions  344  to be coupled with the lower housing  30  may be provided at both ends of the annular shape of the semicircular shape of the link member  341  to allow the link member  341  to be rotatably coupled with the lower housing  30 . Also, a rotation-coupling portion  342  to be coupled with the suction panel  300  and provided to allow the suction panel  300  to be rotatably coupled with respect to the link member  341  may be disposed at a central portion of the link member  341 . 
     That is, the link member  341  may be rotatably coupled with each of the lower housing  30  and the suction panel  300 . 
     Accordingly, when the user pressurizes the suction panel  300  downward, the link member  341  may be interconnected with the suction panel  300 , may rotate with respect to the lower housing  30 , and may be moved below the lower housing  30  together with the suction panel  300 . The link member  341  may support the suction panel  300  at an interval from the lower housing  30  as much as a moved distance below the lower housing  30 . 
     The suction panel  300  may be moved by the link member  341  by a certain distance below and may be rotated with respect to the link member  341  by the rotation-coupling portion  342 . The suction panel  300  may vertically rotate on the rotation-coupling portion  342  as a rotation axis. 
     The hinge member  343  may limit a movement of the link member  341  by connecting the lower housing  30  with a center of the link member  341 , that is, a portion adjacent to the rotation-coupling portion  342 . 
     The hinge member  343  may be provided between the lower housing  30  and the suction panel  300  while being folded when the suction panel  300  is coupled with the lower housing  30 , and may be extended downward while being interconnected with the link member  341  when the suction panel  300  is pressurized downward. 
     As described above, the hinge member  343  may limit the rotation of the link member  341  to allow the link member  341  to support the suction panel  300  while keeping the certain interval from the lower housing  30 . 
     Here, when a distance between the rotation-coupling portion  342  and the lower housing  30  maintained by the hinge member  343  is referred to as L 1  and a distance between an outer circumferential surface of the suction panel  300  and the rotation-coupling portion  342  is referred to as L 2 , it is necessary that a length of L 1  is greater than a length of L 2  to allow rotation of the suction panel  300  not to be limited by the lower housing  30  when it is rotating. 
     Accordingly, the hinge member  343  may support the link member  341  to allow the length of L 1  to be greater than the length of L 2 . That is, it is necessary that the distance between the rotation-coupling portion  342  and the lower housing  30  is at least identical to the length of L 2  when the hinge member  343  extends downward by a maximal length. 
     Unlike the coupling member  130  in accordance with one embodiment of the present disclosure, since the coupling member  330  in accordance with another embodiment of the present disclosure does not include the second hook  135 , the filter  120  may be disposed on an upper surface of the suction panel  300  while including coupling components in addition to the coupling member  330 . However, the coupling member  330  in accordance with another embodiment of the present disclosure is not limited to the drawings and may include the second hook  135 , and accordingly additional may not include additional components. 
     Here, it is necessary to dispose the coupling member  330  to be in contact with a side on which an outer surface of the filter  120  is disposed. Also, it is necessary to provide at least two coupling members  330  to restrict the outer circumferential surface of the filter  120 . 
     Hereinafter, a suction panel  400  in accordance with another embodiment of the present disclosure will be described. Hereinafter, since components other than the suction panel  400  and a supporting unit  440  to be described below are identical to components of one embodiment described above, a description thereof will be omitted. 
       FIG.  20    is a perspective view illustrating a suction panel of an air conditioner in accordance with another embodiment of the present disclosure when being separated.  FIG.  21    is a side cross-sectional view schematically illustrating the suction panel of the air conditioner in accordance with another embodiment of the present disclosure when being separated. 
     As shown in  FIG.  20   , the suction panel  400  may be rotated in a direction perpendicular to the rotation axis of the air blowing fan  40  as a rotation axis to be separated from and coupled with the housing  10 . In detail, when the user pressurizes the suction panel  400  in a lower-side direction of the indoor unit  1  of the air conditioner, the suction panel  400  may rotate in the lower-side direction, which is the direction being pressurized, and may be separated from the lower housing  30 . 
     To allow the suction panel  400  to be rotated while being supported by the lower housing  30 , the supporting unit  440  may be provided. 
     The supporting unit  440  may include a hinge member  441  which connects the lower housing  30  with the suction panel  400 , a rotating portion  442  which allows the hinge member  441  to be rotatably coupled with the lower housing  30 , and a rotation-coupling portion  443  which allows the suction panel  400  to be rotatably coupled with respect to the hinge member  441 . 
     The hinge member  441  may be disposed between the suction panel  400  and the lower housing  30  while being folded when the suction panel  400  is coupled with the lower housing  30 , and may be extended downward while being interconnected with the suction panel  400  when the suction panel  400  is pressurized downward. 
     Here, the hinge member  441  is extended downward and supports the suction panel  400  while being spaced apart therefrom. When a distance between the lower housing  30  on which the hinge member  441  is provided while extended and the rotation-coupling portion  443  is referred to as L 1  and a distance between an outer circumferential surface of the suction panel  400  and the rotation-coupling portion  443  is referred to as L 2 , it is necessary that a length of L 1  is greater than a length of L 2  to allow rotation of the suction panel  400  not to be limited by the lower housing  30  while rotating. 
     Accordingly, the hinge member  441  may support the suction panel  400  to allow the length of L 1  to be greater than the length of L 2 . That is, it is necessary that the distance between the rotation-coupling portion  443  and the lower housing  30  is at least identical to the length of L 2  when the hinge member  441  is extended downward by a maximal length. 
     Hereinafter, a suction panel  500  in accordance with another embodiment of the present disclosure will be described. Hereinafter, since components other than the suction panel  500  and a supporting unit  540  to be described below are identical to components of the embodiment described above, a description thereof will be omitted. 
       FIG.  22    is a view illustrating a suction panel of an air conditioner in accordance with another embodiment of the present disclosure when being separated. 
     As shown in  FIG.  22   , the suction panel  500  may be rotated in a direction perpendicular to the rotation axis of the air blowing fan  40  as a rotation axis to be separated from and coupled with the housing  10 . In detail, when the user pressurizes the suction panel  500  in a lower-side direction of the indoor unit  1  of the air conditioner, the suction panel  500  may rotate in the lower-side direction, which is the direction being pressurized, and may be separated from the lower housing  30 . 
     To allow the suction panel  500  to be rotated while being supported by the lower housing  30 , the supporting unit  540  may be provided. 
     To allow one side of an outer circumferential surface of the supporting unit  540  to be hinge-coupled with one end of the lower housing  30 , the suction panel  500  and the lower housing  30  may be coupled through a hinge portion. 
     Accordingly, when the user pressurizes the suction panel  500  downward, the suction panel may rotate downward on a hinge axis of the supporting unit  540  as a rotation axis. 
     Hereinafter, a cover member  600  and a coupling of the cover member  600  with the indoor unit  1  of the air conditioner will be described in detail. 
       FIG.  23    is a view illustrating a state in which a cover member in accordance with one embodiment of the present disclosure is separated.  FIG.  24    is a partial view illustrating a state in which the air conditioner in accordance with one embodiment of the present disclosure is coupled.  FIG.  25    is a partial enlarged top view of the cover member in accordance with one embodiment of the present disclosure.  FIG.  26    is a view illustrating a rotation state of the cover member in accordance with one embodiment of the present disclosure. 
     Referring to  FIG.  1   , the cover member  600  which covers an outer perimeter of the lower housing  30  may be disposed at a lowermost portion of the indoor unit  1  of the air conditioner. Auxiliary cover members  650  separably disposed from the cover member  600  may be provided at four rectangular corners of the cover member  600 . 
     The auxiliary cover members  650  to be described below may be provided separably from the cover member  600  to cover a coupled portion formed by screw-coupling an auxiliary coupling member  610  with the cover member  600  after the cover member  600  is hook-coupled with the indoor unit  1  of the air conditioner, particularly, with the drain tray  90 . 
     Also, the cover member  600  may include through portions  620  which include openings to allow the user to easily work through the cover member  600  when the indoor unit  1  of the air conditioner is installed in the ceiling at the four rectangular corners, and the auxiliary cover members  650  may cover a coupled portion of the cover member  600  and the indoor unit  1  of the air conditioner and the through portions  620 . 
     That is, the auxiliary cover members  650  may be separated to allow the user to work while the cover member  600  is coupled or the indoor unit  1  of the air conditioner is mounted. When the work is finished, the auxiliary cover members  650  may be coupled with the cover member  600  to cover the four rectangular corners of the cover member  600 . 
     The cover member  600 , the lower housing  30 , the drain tray  90 , and the upper housing  20  are layered from a lower side of the indoor unit  1  of the air conditioner to be coupled. 
     In the case of a conventional air conditioner, in detail, in the case of a type of air conditioner controlling a discharged air flow using a general blade, a cover member, a drain tray, and a housing may be layered from a lower side. In the case of the air conditioner in accordance with the embodiment of the present disclosure, since the air flow controller is provided below the drain tray instead of including a blade, the number of additionally layered components such as the plurality of lower housings  30  is larger than the conventional air conditioner. Accordingly, it may be difficult to couple respective components. 
     Particularly, it is difficult to assemble layered components with one another due to the large number thereof. Since each of components is formed of an injection-molded product generally including plastic properties, when components are assembled with one another, they may be easily damaged by contact thereamong even due to a minor shock, thereby deteriorating durability of the indoor unit  1  of the air conditioner. 
     Accordingly, to overcome this, as shown in  FIG.  24   , the respective components are not coupled with one another, but may be coupled with the auxiliary coupling member  610  to increase the durability. 
     The auxiliary coupling member  610  may be extended in a vertical direction of an outer circumferential surface of the indoor unit  1  of the air conditioner, and may include a material having high strength such as steel. 
     The lower housing  30  and the drain tray  90  may respectively include a first assembling portion  39  and a second assembling portion  95  which protrude outward from the outer circumferential surface. The first assembling portion  39  and the second assembling portion  95  may be layered and coupled with the auxiliary coupling member  610 . 
     The cover member  600  may include a coupling slit  630  to be screw-coupled together with the first assembling portion  39  and the second assembling portion  95  may be provided at each of the four rectangular corners corresponding to the first assembling portion  39  and the second assembling portion  95 . This will be described in detail below. 
     Also, as the auxiliary coupling member  610  is inserted into the upper housing  20 , the upper housing  20  may be coupled by the auxiliary coupling member  610 . 
     The cover member  600  may be pressurized toward the indoor unit  1  of the air conditioner and may be coupled with the indoor unit  1  of the air conditioner. In detail, the cover member  600  may be pressurized upward and may be hook-coupled with the second assembling portion  95 . 
     The cover member  600  may include a coupling hook  640  which protrudes toward the drain tray  90 , and a recessed portion  96  to be coupled with the coupling hook  640  may be provided at the second assembling portion  95 . 
     The second assembling portion  95  may include a coupling surface  95   a , which protrudes in a radial direction of the drain tray  90  and is screw-coupled with the first assembling portion  39  and the auxiliary coupling member  610 , and an extension surface  95   b , which is extended upward along an outer perimeter of the coupling surface  95   a.    
     The first assembling portion  39  may be disposed at a lower surface of the coupling surface  95   a  and the auxiliary coupling member  610  may be disposed at an upper surface thereof to be screw-coupled while being layered. The recessed portion  96  may be provided at one side of the extension surface  95   b , and may be hook-coupled with the coupling hook  640 . 
     However, the recessed portion  96  is not limited to one embodiment of the present disclosure and may be disposed at the first assembling portion  39 . Here, the first assembling portion  39  may include a coupling portion and an extension surface, and the second assembling portion  95  may be disposed on an upper surface of the first assembling portion  39  and may be screw-coupled with the auxiliary coupling member  610  disposed above the first assembling portion  39 . 
     When the cover member  600  is pressurized upward, the coupling hook  640  may be moved upward, may be guided along an upper side of the extension surface  95   b , and may arrive at and be hook-coupled with the recessed portion  96 . 
     Due to the coupling hook  640 , the user may easily couple the cover member  600  with the indoor unit  1  of the air conditioner only by performing an operation of pressurizing the cover member  600  upward. 
     In the case of a conventional air conditioner, it is necessary that one user supports a cover member not to fall and another user couples the cover member to fix the cover member, which is inconvenient. The cover member  600  in accordance with one embodiment of the present disclosure may be fixed to the indoor unit  1  of the air conditioner by simply pressurizing the cover member  600  upward. 
     In a process of coupling the cover member  600 , first the auxiliary cover member  650  pressurizes the cover member  600  in a separate state toward the indoor unit  1  of the air conditioner to allow the coupling hook  640  to be hook-coupled with the recessed portion  96 . 
     After that, the user may insert a screw into the coupling slit  630  provided at the cover member  600 , and may screw-couple the cover member  600 , the first and second assembling portions  39  and  95 , and the auxiliary coupling member  610  while they are layered. 
     Although described below, the coupling slit  630  is slidable with respect to the screw and may adjust an angle of coupling the cover member  600  by rotating the cover member  600 . After coupling is completed, the auxiliary cover member  650  may be coupled with the cover member  600 , thereby finishing the process of coupling the cover member  600 . 
     When the cover member  600  is separated, the user may separate the auxiliary cover member  650 , may remove the screw from the coupling slit  630 , and may disassemble a hook-coupled state of the coupling hook  640  through the through portion  620 , thereby separating the cover member  600 . 
     Here, even when the screw is removed from the coupling slit  630 , it is possible to prevent the cover member  600  from suddenly falling since the cover member  600  is hook-coupled with the drain tray  90 . 
     The coupling hook  640  may include a disassembling rib  647  which allows the user to pressurize one side of the coupling hook  640  to easily disassemble the hook-coupled state. The disassembling rib  647  may be provided to be extended upward from an upper end of the coupling hook  640  to allow the user to easily disassemble hook-coupling by pulling the disassembling rib  647  in the radial direction of the drain tray  90  through the through portion  620 . 
     Although not shown in the drawings, in order to easily disassemble the hook coupling, a holding portion may be provided at one side of the coupling hook  640  and an incised portion may be provided at one side of the cover member  600  corresponding to the holding portion to allow a thin shaft such as a screw driver to pass through the cover member  600  and to arrive at the holding portion. 
     Here, the user may insert the shaft into the incised portion, may allow the shaft passing through the cover member  600  to be held by the holding portion, and may bend the shaft back in the radial direction of the drain tray  90 . Accordingly, the coupling hook  640  may be interconnected with a movement of the shaft and may be bent back in a direction of departing from the recessed portion  96 , thereby releasing the hook coupling. 
     As shown in  FIG.  25   , the coupling slit  630  may be disposed in an area at which the cover member  600  is covered by the auxiliary cover member  650 . 
     The screw is inserted into the coupling slit  630  to allow the cover member  600  to be screw-coupled with the auxiliary coupling member  610 . A longitudinal portion  631  may be provided to allow the coupling slit  630  to be slidable with respect to the screw after the screw is coupled. 
     In detail, as shown in  FIG.  26   , after the cover member  600  is screw-coupled with the auxiliary coupling member  610 , the user may dispose the cover member  600  by rotating the cover member  600  on the rotation axis of the air blowing fan  40  clockwise or counterclockwise to adjust the angle of coupling the cover member  600   
     The user may rotate the cover member  600  to adjust verticality and horizontality between a ceiling surface at which the indoor unit  1  of the air conditioner is installed and the cover member  600 . 
     That is, when the cover member  600  is pressurized clockwise or counterclockwise, the coupling slit  630  may reciprocate a distance between one end and the other end of the longitudinal portion  631  with respect to the screw while sliding. Accordingly, the cover member  600  may be rotated as much as a length of the longitudinal portion  631 . 
     Also, when the cover member  600  is rotated, the coupling hook  640  coupled with the recessed portion  96  also may be rotated clockwise or counterclockwise while being interconnected with the cover member  600 . Accordingly, a width of the recessed portion  96  may be larger than a width of the coupling hook  640  in order not to limit the rotation of the cover member  600 . 
     A difference between the widths of the recessed portion  96  and the coupling hook  640  may be at least identical to a length of the rotation of the cover member  600  through sliding of the coupling slit  630 . 
     However, since the coupling hook  640  is hook-coupled with the recessed portion  96  before the screw is assembled with the coupling slit  630  and the width of the recessed portion  96  is larger than the width of the coupling hook  640 , the cover member  600  may rotate with respect to the housing  10  as much as the difference between the widths of the recessed portion  96  and the coupling hook  640 . 
     Accordingly, the cover member  600  may be rotatably coupled with the housing  10  at a certain interval regardless of whether the screw is inserted into the coupling slit  630 . 
     The cover member  600  may support the auxiliary cover member  650  while being spaced apart using a wire to prevent the auxiliary cover member  650  from falling when the auxiliary cover member  650  is separated. 
     That is, a wire binding portion  621  capable of binding the wire is provided at one side of the cover member  600  in such a way that one side of the wire is bound to the wire binding portion  621  and the other side of the wire is connected to one side of the auxiliary cover member  650  to prevent the auxiliary cover member  650  from falling while being separated. 
     In detail, the wire binding portion  621  may protrude toward an inside of the through portion  620 . The wire binding portion  621  is formed in a hook shape at the through portion  620  in such a way that the user may easily bind the wire to connect the cover member  600  with the auxiliary cover member using the wire. 
     Also, the wire binding portion  621  may be integrally injection-molded together with the cover member  600  in a shape extended from one side of the cover member  600  toward the through portion  620 . Accordingly, since an additional component for preventing the auxiliary cover member  650  from falling is unnecessary, the number of components for forming the indoor unit  1  of the air conditioner may be reduced, the process may be simplified, and manufacturing costs may be reduced. 
     Hereinafter, a coupling hook  640 ′ in accordance with another embodiment of the present disclosure will be described. Hereinafter, since components other than the coupling hook  640 ′ to be described below are identical to components of one embodiment described above, a description thereof will be omitted. 
       FIG.  27    is a partial enlarged view of a cover member in accordance with another embodiment of the present disclosure.  FIG.  28    is a side cross-sectional view illustrating a state in which the cover member in accordance with another embodiment of the present disclosure is separated from the air conditioner. 
     As shown in  FIG.  27   , the coupling hook  640 ′ may be provided in a spring holder shape capable of moving forward and backward in the radial direction of the drain tray  90 . A holder  641  of the spring holder is hook-coupled with the recessed portion  96  in such a way that the cover member  600  may be coupled with the indoor unit  1  of the air conditioner. The coupling hook  640 ′ may include the holder  641  hook-coupled with the recessed portion  96 , a guide sloping surface  642  formed on an upper surface of the holder  641  to guide a reciprocating movement of the holder  641  when the holder  641  is in contact with the first and second assembling portions  39  and  95 , a spring member  643  which allows the holder  641  to reciprocate, and a supporting panel  644  which supports one side of the spring member  643 . 
     Like the coupling hook  640  in accordance with one embodiment of the present disclosure, when the cover member  600  is pressurized upward, the coupling hook  640 ′ is hook-coupled with the recessed portion  96  to allow the cover member  600  to easily be coupled with the drain tray  90 . 
     When the cover member  600  is pressurized upward, the coupling hook  640 ′ may be in contact with one side of each of the first and second assembling portions  39  and  95  while moving upward. Here, the guide sloping surface  642  is in contact with the one sides of the first and second assembling portions  39  and  95 . When the cover member  600  is continuously pressurized upward while the guide sloping surface  642  is in contact with the one sides of the first and second assembling portions  39  and  95 , the one sides of the first and second assembling portions  39  and  95  pressurize the holder  641  along the guide sloping surface  642  in the radial direction of the drain tray  90 . Accordingly, the spring member  643  is contracted and the holder  641  moves backward in the radial direction of the drain tray  90 . 
     After that, when the holder  641  is disposed at a side of the recessed portion  96  due to continuous upward pressurization, the spring member  643  is disposed while being spaced apart from the first and second assembling portions  39  and  95 , which pressurize the guide sloping surface  642 , and is extended again, thereby allowing the holder  641  move inwardly forward in the radial direction of the drain tray  90 . 
     As the holder  641  moves forward, a lower surface of the holder  641  and the recessed portion  96  are hook-coupled, thereby coupling the cover member  600  with the drain tray  90 . 
     When the coupling hook  640 ′ is separated from the drain tray  90 , the user may release hook-coupling between the coupling hook  640 ′ and the recessed portion  96  by pulling a backward movement protrusion  645  extended downward from the lower surface of the holder  641  in the radial direction of the drain tray  90 . 
     The backward movement protrusion  645  may be disposed at the through portion  620  to be easily gripped by the user through the through portion  620 . 
     Hereinafter, a cover member  700  in accordance with another embodiment of the present disclosure will be described. Hereinafter, since components other than the cover member  700  to be described below are identical to components of one embodiment described above, a description thereof will be omitted. 
       FIG.  29    is a view illustrating a state in which a cover member in accordance with another embodiment of the present disclosure is separated.  FIG.  30    is a view illustrating a state in which the cover member in accordance with another embodiment of the present disclosure is coupled.  FIG.  31    is a perspective view of the cover member in accordance with another embodiment of the present disclosure.  FIGS.  32 A and  32 B  are top views illustrating a state in which the cover member in accordance with another embodiment of the present disclosure is coupled. 
     The cover member  600  in accordance with one embodiment of the present disclosure shown in  FIGS.  1 ,  3 , and  23  to  28    may cover a separating space formed between an embedding hole and the housing  10  when the indoor unit  1  of the air conditioner is embedded in the ceiling so as not to expose the separating space. 
     In detail, when the housing  10  in accordance with one embodiment of the present disclosure is provided in a cylindrical shape and a conventional embedment hole is provided in a quadrangular shape, a separating space may occur between an outer circumferential surface of the housing  10  and corners of the quadrangular embedding hole. Accordingly, the cover member  600  may be provided in a shape with four rectangular corners, and may cover the separation space formed at the four rectangular corners. 
     However, recently, ceiling-installed air conditioners are not installed in embedding holes but a method of installing an air conditioner on a ceiling while an indoor unit thereof is entirely exposed is generally used. 
     When the indoor unit  1  of the air conditioner in accordance with one embodiment of the present disclosure is installed on the ceiling while being exposed as described above, since the housing  10  is formed in a cylindrical shape, it is unnecessary to form the cover member  600  in a quadrangular shape. In addition, as unity is lacking in a design of the indoor unit  1  of the air conditioner formed in a cylindrical shape, aesthetic properties may be deteriorated. 
     Accordingly, when the indoor unit  1  of the air conditioner is installed while being exposed, the cover member  700  in accordance with another embodiment of the present disclosure shown in  FIGS.  28  to  32    may be provided in an annular shape including a radius corresponding to the outer circumferential surface of the housing  10  to improve the aesthetic properties of the indoor unit  1  of the air conditioner. 
     However, the annular cover member  700  may not only be applied to a case of being disposed on a ceiling while being exposed, but it may also be applied to a case of forming a circular embedding hole in the ceiling. 
     As shown in  FIGS.  29  and  30   , the cover member  700  may be pressurized by the user toward the indoor unit  1  of the air conditioner to be coupled with the indoor unit  1  of the air conditioner. When the cover member  700  is pressurized upward and in contact with one side of the lower housing  30  or the drain tray  90 , the cover member  700  may be rotated to be fixed to the lower housing  30  or the drain tray  90 . 
     In detail, as shown in  FIG.  31   , the cover member  700  has a circular opening and a coupling protrusion  710  which protrudes inward in a radial direction is provided on an inner circumferential surface of the cover member  700 . When the coupling protrusion  710  is rotated by the user on the outer circumferential surface of the drain tray  90  and is then disposed at a position corresponding to the extension surface  95   b  at which the recessed portion  96  is disposed, that is, the extension surface  95   b  disposed on a side facing the outer circumferential surface of the drain tray  90  (hereinafter, the extension surface  95   b  will be defined as a first extension surface  95   b ′ and the extension surface  95   b  extended outward from the drain tray  90  at both ends of the first extension surface  95   b ′ will be defined as a second extension surface  95   b ″), the coupling protrusion  710  may be supported by an upper side of the first extension surface  95   b ′ to be coupled with the cover member  700 . 
     Referring to  FIG.  32   a   , when the coupling protrusion  710  is not supported by the upper side of the first extension surface  95   b ′, a coupling state of the drain tray  90  and the coupling protrusion  710  may not be maintained and fixed. However, as shown in  FIG.  32   b   , when the coupling protrusion  710  is rotated along the outer circumferential surface of the drain tray  90  and is disposed on the first extension surface  95   b ′, a lower side of the coupling protrusion  710  is supported by the first extension surface  95   b ′, thereby allowing the cover member  700  to be supported by the drain tray  90 . 
     As described above, the recessed portion  96  may be provided in another component such as the lower housing  30  including an assembled portion not in the drain tray  90 . 
     As the cover member  700  is provided in an annular shape, the coupling protrusion  710  protrudes inward along an outer circumferential surface to allow the user to naturally rotate the cover member  700  and the coupling protrusion  710  to be disposed on the first extension surface  95   b ′. This is so the user may intuitively couple the cover member  700  for convenience and so that additional components are not required for coupling the cover member  700  with the indoor unit  1  of the air conditioner to reduce manufacturing costs and to simplify the process. 
     As shown in  FIG.  31   , a stopper  720  may be provided at one side of the coupling protrusion  710 . As described above, the coupling protrusion  710  is disposed on the first extension surface  95   b ′ due to a rotation in such a way that the cover member  700  is supported by the drain tray  90 . Also, when the cover member  700  is separated, the user may separate the cover member  700  by causing the coupling protrusion  710  to depart from the first extension surface  95   b ′ by rotating-pressurizing. 
     Here, even when a physical force such as an externally applied force is applied in a situation where the cover member  700  is not separated, the cover member  700  may be rotated. When the coupling protrusion  710  departs from the first extension surface  95   b ′ due to the rotation, a coupling of the cover member  700  may be released without an intention to do so. 
     To prevent this, the stopper  720  may be provided at one side of the coupling protrusion  710  to prevent the cover member  700  from being arbitrarily rotated. 
     The stopper  720  may be extended upward from the one side of the coupling protrusion  710  and may protrude toward an inside of the cover member  700 . When the coupling protrusion  710  is disposed on the first extension surface  95   b ′, the stopper  720  may be disposed corresponding to one side of the second extension surface  95   b ″. Accordingly, even when a rotating force is applied to the cover member  700 , the stopper  720  is in contact with the second extension surface  95   b ″, thereby limiting the rotation of the cover member  700 . 
     An auxiliary coupling protrusion  730  to be in contact with one side of the recessed portion  96  when the coupling protrusion  710  is disposed above the first extension surface  95   b ′ may be provided below the coupling protrusion  710 . 
     The auxiliary coupling protrusion  730  may protrude toward the inside of the cover member  700  and may be extended as much as a length approximately corresponding to a thickness of the first extension surface  95   b ′. The auxiliary coupling protrusion  730  may be disposed to be in contact with a side of the recessed portion  96 , at which the stopper  720  and the second extension surface  95   b ″ are in contact with each other. 
     Rotation of the cover member  700  may be limited by the stopper  720  in one direction. However, when rotated in the opposite direction, the rotation may not be limited, thereby allowing the coupling protrusion to depart from the first extension surface  95   b ′ as described above. 
     To prevent this, the auxiliary coupling protrusion  730  may be in contact with one side of the recessed portion  96  to limit the rotation of the cover member  700  in the direction opposite to the stopper  720 . 
     Accordingly, the user may separate the cover member  700  by applying a force capable of causing the auxiliary coupling protrusion  730  to depart from the recessed portion  96  only when separating the cover member  700 . 
     The auxiliary coupling protrusion  730  may protrude in a triangular shape in such a way that surfaces in diagonal directions may guide an insertion into or departure from the recessed portion  96 . 
     Hereinafter, a configuration of the filter  120  will be described in detail. 
       FIG.  33    is a partial perspective view of a filter in accordance with one embodiment of the present disclosure.  FIG.  34    is a top view of the filter in accordance with one embodiment of the present disclosure.  FIG.  35    is a partial enlarged view of the filter in accordance with one embodiment of the present disclosure. 
     As described above, the filter  120  may be provided in a circular shape. Since the suction panel  100  is provided in an annular shape, and particularly since the indoor unit  1  of the air conditioner is formed in a cylindrical shape, the filter  120  may be formed in a shape corresponding thereto. 
     In a conventional air conditioner, an indoor unit is provided in a rectangular parallelepiped shape, and a panel provided with a suction port is provided in a quadrangular shape. A filter disposed in the quadrangular panel is generally provided in a quadrangular shape according to the shape of the panel. A suction flow path through which air flows into an air blowing fan through the suction port is generally provided in a circular shape in consideration of an air flow in such a way that the air is not suctioned in through four rectangular corners of the filter, which is an unnecessary space. 
     However, the filter  120  in accordance with one embodiment of the present disclosure may be formed in a circular shape, and a radius of the filter  120  is provided to correspond to a radius of a suction flow path of the indoor unit  1  of the air conditioner to fully utilize the filter  120  without unnecessary portions. 
     The filter  120  may include an outer circumferential frame  121  provided in a circular shape, a plurality of internal frames  122  extended in one direction toward an inside of the outer circumferential frame  121 , and a plurality of reinforcing ribs  123  which intersect with the plurality of internal frames  122  and reinforce rigidity of the filter  120 . 
     Also, as shown in  FIG.  33   , a mesh member  124  which collects dust in the air may be provided among the plurality of internal frames  122 . The mesh member  124  may be provided in a corrugated shape including ridges  124   a  and furrows  124   b.    
     The mesh member  124  may increase in cross section and may collect a large amount of dust when provided in the corrugated shape and forming a plurality of bent portions. The mesh member  124  may be disposed among the plurality of internal frames  122  and may be coupled with both side of each of the plurality of internal frames  122 . 
     Bent protrusions  122   a  including the same shapes as the ridges  124   a  and furrows  124   b  of the corrugated shape of the mesh member  124  are provided at both ends of the internal frame  122  to allow the mesh member  124  to easily get in contact with the both ends of the internal frame  122 . 
     The plurality of reinforcing ribs  123 , which intersect with the internal frames  122 , may intersect on the mesh member  124 . Here, the reinforcing ribs  123  may extend in a shape corresponding to the corrugated shape of the mesh member  124  to intersect with the internal frames  122  while supporting the mesh member  124 . 
     That is, the reinforcing ribs  123  may intersect with the internal frames  122  while including bent portions  123   c  which include ridges  123   a  and furrows  123   b  corresponding to the corrugated shape of the mesh member  124  which includes the ridges  124   a  and furrows  124   b.    
     The ridges  123   a  and the furrows  123   b  of the bent portions  123   c  may be formed corresponding to the ridges  124   a  and the furrows  124   b  of the mesh member  124  to allow the mesh member  124  to be supported by the reinforcing ribs  123  while maintaining the corrugated shape. 
     As shown in  FIG.  34   , an angle at which the internal frame  122  and the reinforcing rib  123  intersect one another may be within the range from 0 to 180 degrees. 
     In a conventional air conditioner, as a filter is provided in a quadrangular shape, internal frames and reinforcing ribs intersect at 90 degrees in consideration of an efficiency of suctioning air. However, in the filter  120  in accordance with one embodiment of the present disclosure, the internal frames  122  and the reinforcing ribs  123  may intersect one another at various angles without being limited in their intersecting angle 
     The suction panel  100  includes a suction grill  101  (not shown) which forms the suction port  110 . The intersecting angle of the internal frames  122  and the reinforcing ribs  123  may freely be set within the range from 0 to 180 degrees, thereby arranging the internal frames  122  and the reinforcing ribs  123  at a position of the suction grill  101 . 
     Accordingly, since the internal frames  122  and the reinforcing ribs  123  are not exposed outward, aesthetic properties may increase. 
     As described above, the internal frames  122  and the reinforcing ribs  123  may intersect one another at various angles. However, as shown in  FIG.  35   , the ridges  123   a  or furrows  123   b  of the reinforcing ribs  123  in contact with the internal frames  122  may interest with the internal frames  122  at right angles. 
     That is, the entire arrangement of the internal frames  122  and the reinforcing ribs  123  may be within the range from 0 to 180 degrees, but angles between the internal frames  122  and the reinforcing ribs  123  at portions where the internal frames  122  and the reinforcing ribs  123  are in contact with one another may be provided as right angles. 
     Since the reinforcing ribs  123  includes the plurality of bent portions  123   c , even when in contact with the internal frames  122  at right angles, the bent portions  123   c  are diagonally bent and then the reinforcing ribs  123  and the internal frames  122  may generally diagonally intersect. 
     The internal frames  122  and the reinforcing ribs  123  are in perpendicular contact with one another to allow the mesh member  124  to be supported by the internal frames  122  while maintaining the entire corrugated shape of the mesh member  124 . When one side each of the internal frames  122  and the reinforcing ribs  123  get in contact with each other at angles other than right angles, creases occur in a section of the mesh member  124  corresponding thereto and it is then impossible to maintain the corrugated shape in some sections, thereby preventing an air flow and decreasing coupling forces between the internal frames  122  or the reinforcing ribs  123 , which deteriorates durability. 
     However, in accordance with one embodiment of the present disclosure, the mesh member  124  may uniformly maintain the corrugated shape in the whole area in contact with the internal frames  122 , thereby overcoming limitations described above. 
     As is apparent from the above description, a suction panel of an air conditioner in accordance with one embodiment of the present disclosure laterally rotates with respect to a housing and is separated to allow a user to easily separate the suction panel. 
     Also, a suction panel of an air conditioner in accordance with one embodiment of the present disclosure vertically rotates with respect to a housing and is separated to allow a user to easily separate the suction panel. 
     Also, a cover member of an air conditioner in accordance with one embodiment of the present disclosure is pressurized toward a housing and is coupled to allow a user to easily couple the cover member. 
     Also, a filter of an air conditioner in accordance with one embodiment of the present disclosure has a circular shape and includes filter frames in various shapes. 
     Although a few embodiments of the present disclosure have been shown and described, it should be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined in the claims and their equivalents.