Patent Publication Number: US-2019178240-A1

Title: Compressor

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based on and claims priority under 35 U.S.C. § 119 to Korean Patent Application No. 10-2017-0168932, filed on Dec. 11, 2017, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Field 
     The present disclosure relates to a compressor having an improved oil supply structure. 
     2. Description of the Related Art 
     In general, a compressor is a machine which receives power from a power generator, such as a motor or a turbine, and compresses air, a refrigerant, or other various operating gas to increase pressure. The compressor is widely used in home appliances, such as a refrigerator, an air conditioner, etc., or industrial machinery. 
     Compressors are classified into a reciprocating compressor, a rotary compressor, and a scroll compressor according to compressing methods and sealing structures. 
     The reciprocating compressor has a structure that forms compressing space in which operating gas is inhaled or discharged between a piston and a cylinder to compress a refrigerant when the piston performs a linear reciprocating motion in the inside of the cylinder. 
     A hermetic reciprocating compressor includes compressing mechanism for compressing a refrigerant through a reciprocating motion of a piston and electrically-driven mechanism for driving the compressing mechanism, wherein the compressing mechanism and the electrically-driven mechanism are installed in the inside of a single case. 
     The hermetic reciprocating compressor includes a shaft for transferring a driving force of the electrically-driven mechanism to the compressing mechanism. In the lower portion of the case, oil for lubricating and cooling the components of the individual mechanisms is stored, and the shaft includes an oil supply structure for raising the oil to supply it to the components. 
     There are various oil supply structures, and generally, a centrifugal pump structure that supplies oil upward by the centrifugal force of a shaft and a viscous liquid pump structure that supplies oil upward by the viscosity of oil are used. 
     Particularly, the viscous liquid pump structure includes a rotation shaft having a cavity through which oil moves, a pickup shaft accommodated in the cavity of the rotation shaft, and a support member for supporting the pickup shaft. 
     SUMMARY 
     Therefore, it is an aspect of the present disclosure to provide a compressor including an improved oil supply structure for efficiently raising oil stored in the lower portion of a case even when a rotation shaft rotates at low revolutions per minute (RPM). 
     It is another aspect of the present disclosure to provide a compressor including an improved bracket or an improved stator core to which a support member for supporting a pickup shaft is coupled. 
     Additional aspects of the 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 disclosure. 
     In accordance with an aspect of the present disclosure, there is provided a compressor including: a case; a stator, accommodated in the case, and including a stator core; a rotor rotatably disposed in an inside of the stator core; a bracket coupled to a lower portion of the stator core; a rotation shaft configured to rotate together with the rotor, and having a cavity for raising oil stored in the case; a pickup shaft accommodated in the cavity; and a support member connected to the pickup shaft to support the pickup shaft, and coupled to the bracket. 
     The stator may include an insulator disposed below the stator core, and bracket may be made of a material having higher strength than a material of the insulator. 
     The bracket may be made of steel. 
     The bracket may include a bracket body, and a coupling portion which is provided in the bracket body and to which the support member is coupled. 
     The coupling portion may include a coupling portion body extending downward from the bracket body, and an accommodating space which is provided in the coupling portion body and in which the support member is inserted. 
     The support member may include an insertion portion inserted in the accommodating space. 
     The insertion portion inserted in the accommodating space may be positioned between the coupling portion body and the stator core. 
     The insertion portion inserted in the accommodating space may be spaced from the bracket body. 
     The support member may further include an extension portion bent from the insertion portion, and the pickup shaft may include a through portion which the extension portion penetrates. 
     The extension portion may include a first extension portion bent downward from the insertion portion, and a second extension portion bent from the first extension portion and penetrating the through portion. 
     A diameter of the accommodating space may be equal to or smaller than three times a diameter of the support member. 
     In accordance with another aspect of the present disclosure, there is provided a compressor including: a case; a stator, accommodated in the case, and including a stator core; a rotor rotatably disposed in an inside of the stator core; a bracket coupled to a lower portion of the stator core; a rotation shaft configured to rotate together with the rotor, and having a cavity for raising oil stored in the case; a pickup shaft accommodated in the cavity; and a support member connected to the pickup shaft to support the pickup shaft, and coupled to the stator core. 
     The stator core may include a coupling portion which is disposed in an outer wall of the stator core and to which the support member is coupled. 
     The stator may include a stator coil, the stator core may include a core body, and a winding portion extending inward from the core body, the stator coil may be wound around the winding portion, and the coupling portion may be provided in the core body. 
     The stator core may include a plurality of unit cores stacked on one another, and the coupling portion may include a coupling portion body extending downward from a lowest unit core of the plurality of unit cores, and an accommodating space which is provided in the coupling portion body and in which the support member is inserted. 
     The core body may include a first core body to which the bracket is coupled, and a second core body extending from the first core body, and the coupling portion may be provided in the second core body. 
     The support member may include an insertion portion inserted in the coupling portion. 
     In accordance with still another aspect of the present disclosure, there is provided a compressor including: a case; a stator core accommodated in the case; a rotor rotatably disposed in an inside of the stator core; a bracket coupled to a lower portion of the stator core; a rotation shaft rotating together with the rotor, and having a cavity for raising oil stored in the case; a pickup shaft coupled to the cavity, and supported on the bracket or the stator core; and a support member having an extension portion coupled to the pickup shaft to support the pickup shaft, and an insertion portion bent from the extension portion and inserted in the bracket. 
     The bracket may include a coupling portion in which the support member is inserted. 
     The bracket may further include a bracket body, and wherein the coupling portion extends downward from the bracket body and in which the insertion portion is inserted. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects of the 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 schematic cross-sectional view of a compressor according to an embodiment of the present disclosure; 
         FIG. 2  is an exploded perspective view showing a coupling structure of a rotation shaft and a pickup shaft in a compressor according to an embodiment of the present disclosure; 
         FIG. 3  shows a structure for raising oil in a compressor according to an embodiment of the present disclosure; 
         FIG. 4  is a perspective view showing the bottom of a support structure of a pickup shaft in a compressor according to an embodiment of the present disclosure; 
         FIGS. 5 and 6  show a bracket in a compressor according to an embodiment of the present disclosure; 
         FIGS. 7 and 8  show a bracket in a compressor according to another embodiment of the present disclosure; 
         FIG. 9  is a perspective view showing the bottom of a support structure of a pickup shaft in a compressor according to another embodiment of the present disclosure; 
         FIG. 10  shows a coupling portion provided in a stator core in the compressor shown in  FIG. 9 ; 
         FIG. 11  is a perspective view showing the bottom of a support structure of a pickup shaft in a compressor according to another embodiment of the present disclosure; and 
         FIG. 12  shows a coupling portion provided in a unit core in the compressor shown in  FIG. 11 . 
     
    
    
     DETAILED DESCRIPTION 
     Configurations illustrated in the embodiments and the drawings described in the present specification are only the preferred embodiments of the present disclosure, and thus it is to be understood that various modified examples, which may replace the embodiments and the drawings described in the present specification, are possible when filing the present application. 
     Also, like reference numerals or symbols denoted in the drawings of the present specification represent members or components that perform the substantially same functions. Also, the terms used in the present specification are used to describe the embodiments of the present disclosure, not for the purpose of limiting the disclosure. 
     It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. It will be understood that when the terms “includes,” “comprises,” “including,” and/or “comprising,” when used in this specification, specify the presence of stated features, figures, steps, components, or combination thereof, but do not preclude the presence or addition of one or more other features, figures, steps, components, members, or combinations thereof. 
     It will be understood that, although the terms “first”, “second”, etc., may be used herein to describe various elements, these elements should not be limited by these terms. The above terms are used only to distinguish one component from another. For example, a first component discussed below could be termed a second component, and similarly, a second component may be termed a first component without departing from the teachings of this disclosure. 
     As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. 
     In the following description, the terms “front”, “rear”, “upper”, and “lower” are defined based on the drawings, and the shapes and positions of the corresponding components are not limited by the terms. 
     Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. An embodiment of a compressor according to the present disclosure relates to a hermetic reciprocating compressor, however, the present disclosure is not limited to this. 
     Also, the compressor according to the present disclosure is used in various home appliances, such as a refrigerator, a water purifier, etc., however, the compressor  1  is not limited to being used in such home appliances. 
       FIG. 1  is a schematic cross-sectional view of a compressor according to an embodiment of the present disclosure. As shown in  FIG. 1 , a compressor  1  may include a case  10  forming the outer appearance. The case  10  may be made of a metal material. 
     Generally, the case  10  may be manufactured by plastic working a steel sheet by a deep drawing method, etc. That is, the case  10  may be manufactured by welding two steel plate structures manufactured in the shape of a hemisphere, and a press method may be used to manufacture a steel plate sheet in the shape of a hemisphere having a predetermined thickness. 
     The case  10  may include accommodating space  11  for accommodating components installed in the inside of the compressor  1  in such a way for the components to be spaced a predetermined distance from the inner wall of the case  10  in order to be prevented from contacting the case  10 . 
     The compressor  1  may include a frame  12  for fixing the components installed in the inside of the case  10 . The compressor  1  may include compressing mechanism  20  installed above the frame  12 , and electrically-driven mechanism  30  installed below the frame  12  for driving the compressing mechanism  20 . 
     The compressing mechanism  20  may include a cylinder  21  forming compressing space for a refrigerant and fixed on the frame  12 , and a piston  22  moving back and forth in the inside of the cylinder  21  to compress the refrigerant. 
     The electrically-driven mechanism  30  may include a stator  100  fixed on the frame  12 , and a rotor  31  rotating in the inside of the stator  100 . 
     The cylinder  21  may be made of an aluminum material. The aluminum material may be aluminum or an aluminum alloy. Due to the aluminum material which is a nonmagnetic material, magnetic flux generated in the rotor  31  may be not transferred to the cylinder  21 . 
     Accordingly, the magnetic flux generated in the rotor  31  may be prevented from being transferred to the cylinder  21  to leak to the outside of the cylinder  21 . 
     The piston  22  may also be made of an aluminum material, like the cylinder  21 . Accordingly, like the cylinder  21 , magnetic flux generated in the rotor  31  may be prevented from being transferred to the piston  22  to leak to the outside of the piston  22 . 
     Since the piston  22  is made of the same material as the cylinder  21 , the piston  22  may have the nearly same thermal expansion coefficient as the cylinder  21 . 
     Since the piston  22  has the nearly same thermal expansion coefficient as the cylinder  21 , the piston  22  may be deformed by the nearly same amount as the cylinder  21  in the high-temperature inside environment of the case  10  when the compressor  1  is driven. 
     Accordingly, when the piston  22  reciprocates in the inside of the cylinder  21 , the piston  22  may be prevented from interfering with the cylinder  21 . 
     The rotor  31  may include a cavity  31   a . The stator  100  may include a stator core  110  corresponding to a fixed portion when the electrically-driven mechanism  30  is driven, and a stator coil  130  (see  FIG. 4 ) installed in the inside of the stator core  110 . 
     The stator core  110  may be made of a metal material, and may be in the shape of a cylinder. When a voltage is applied from a power supply (not shown), the stator coil  130  may generate an electromagnetic force to perform an electromagnetic interaction together with the stator core  110  and the rotor  31 . 
     The electrically-driven mechanism  30  may include an insulator  120  disposed between the stator core  110  and the stator coil  130 . The insulator  120  may prevent the stator core  110  from directly contacting the stator coil  130 . 
     The insulator  120  may include an upper insulator  121  (see  FIG. 4 ) disposed on the stator core  110 , and a lower insulator  122  disposed below the stator core  110 . 
     The stator coil  130  may be wound together with the stator core  110 , the upper insulator  121 , and the lower insulator  122 . 
     When the stator coil  130  directly contacts the stator core  110 , the stator core  110  may interfere with generation of an electromagnetic force from the stator coil  130 . The insulator  120  may space the stator coil  130  from the stator core  110  by a predetermined distance. 
     The rotor  31  may be rotatably installed in the inside of the stator core  110 . The rotor  31  may include a magnet (not shown). The rotor  31  may rotate by an electromagnetic interaction between the stator core  110  and the stator coil  130 , when a voltage is applied to the rotor  31 . 
     The compressor  1  may be disposed vertically to transfer a driving force of the electrically-driven mechanism  30  to the compressing mechanism  20 , and include a rotation shaft  40  rotatably supported by a shaft support portion  13  of the frame  12 . 
     The rotation shaft  40  may be pressed in the cavity  31   a  of the rotor  31 , and rotate together with the rotor  31 . 
     On the rotation shaft  40 , an eccentric portion  41  may be formed to be eccentric from the center axis of rotation of the rotor  31 , and the eccentric portion  41  may be connected to the piston  22  by a connecting rod  23 . 
     Accordingly, a rotation motion of the rotation shaft  40  may be converted to a linear motion of the piston  22  by the connecting rod  23 . The connecting rod  23  may be made of a sintered alloy material. 
     Below the eccentric portion  41 , a disk portion  42  may extend in a radial direction. Between the disk portion  42  and the shaft support portion  13 , a trust bearing  43  (see  FIG. 3 ) may be interposed to smoothly rotate the rotation shaft  40  and simultaneously support the axial-direction weight of the rotation shaft  40 . 
     In the lower portion of the case  10 , oil for lubricating and cooling the individual components of the compressor  1  may be stored, and the oil may be raised through the rotation shaft  40  to be supplied to the individual components. 
     The rotation shaft  40  may have a cavity  44  for raising oil stored in the case  10  through the inner circumferential surface. The pickup shaft  50  may be inserted into the cavity  44 . 
     The pickup shaft  50  may be supported by a support member  60 . Accordingly, when the rotation shaft  40  rotates, the pickup shaft  60  may not rotate. 
     The compressor  1  may include a bracket  200  coupled to the lower portion of the stator core  110 . The bracket  200  may support the stator core  110 . 
     The support member  60  according to an embodiment of the present disclosure may be coupled to the bracket  200  or the stator core  110 . The pickup shaft  60  may be inserted into the cavity  44 , and supported on the bracket  200  or the stator core  110  by the support member  60 . 
     A coupling structure of the support member  60  with the bracket  200  or the stator core  100  will be described in detail, later. 
       FIG. 2  is an exploded perspective view showing a coupling structure of a rotation shaft and a pickup shaft in a compressor according to an embodiment of the present disclosure, and  FIG. 3  shows a structure for raising oil in a compressor according to an embodiment of the present disclosure. 
     Hereinafter, a structure for raising oil will be described in detail with reference to the drawings. 
     As shown in  FIGS. 2 and 3 , a spiral wing  51  may be formed in the outer circumferential surface of the pickup shaft  50  to raise oil stored in the case  10  together with the inner circumferential surface of the rotation shaft  40 . 
     Accordingly, when the rotation shaft  40  rotates, oil stored in the case  10  may rotate in the rotation direction of the rotation shaft  40  by viscosity with the rotation shaft  40  to raise along the spiral wing  51  of the pickup shaft  50 . 
     In  FIG. 3 , A represents the rotation direction of the rotation shaft  40 , and means that the rotation shaft  40  rotates in a clockwise direction as seen from above the rotation shaft  40 . Hereinafter, the rotation direction of the rotation shaft  40  will be described as the rotation direction of the rotation shaft  40  when seen from above the rotation shaft  40 . In  FIG. 3 , B represents a direction in which oil rises. 
     When the rotation shaft  40  rotates in the clockwise direction, the oil stored in the case  10  may rotate in the clockwise direction by viscosity with the rotation shaft  40 . 
     The oil rotating in the clockwise direction may rise along the spiral wing  51  formed in the outer circumferential surface of the pickup shaft  50 . That is, a centrifugal force generated by a rotation of the rotation shaft  40  may be converted to a lifting force by the spiral wing  51  to thus raise the oil. 
     At this time, the pickup shaft  50  and the spiral wing  51  may not rotate by the support member  60  although the rotation shaft  40  rotates, as described above. 
     As such, the compressor  1  according to an embodiment of the present disclosure may raise oil through the inner circumferential surface of the rotation shaft  40 . 
     In the case of a structure of raising oil through the outer circumferential surface of the rotation shaft  40 , the oil may be prevented from being raised by surface pressure (or viscosity with the shaft support portion  13 ) of the shaft support portion  13 , and accordingly, it may be necessary to maintain predetermined RPM of the rotation shaft  40  in order to raise the oil. 
     The compressor  1  according to an embodiment of the present disclosure may raise oil even at low RPM since rising oil is not subject to surface pressure from the shaft support portion  13 . 
     Also, for the same reason, since the compressor  1  can raise oil with a small centrifugal force, it may be possible to reduce the diameter of the rotation shaft  40 . 
     The pickup shaft  50  may include a through portion  52  which protrudes downward and to which the support member  60  is coupled. In the through portion  52 , a through hole  53  which the support member  60  penetrates may be formed. 
     The support member  60  may be a wire. The support member  60  may be a wire bent at a plurality of positions. The support member  60  may include an extension portion  61  penetrating the through hole  53  of the pickup shaft  50 , and an insertion portion  62  coupled to the bracket  200  (see  FIG. 1 ) or the stator core  110  (see  FIG. 1 ). 
     The extension portion  61  may include a first extension portion  61   a  bent downward from the insertion portion  61 , and a second extension portion  61   b  bent from the first extension portion  61   a  and penetrating the through portion  52 . 
     The pickup shaft  50  may be first coupled with the support member  60 , and the support member  60  may be coupled with the bracket  200  or the stator core  110 . The extension portion  61  of the support member  60  may be inserted into the through hole  53  of the pickup shaft  50 , and then, the insertion portion  62  of the support member  60  may be coupled to the bracket  200  or the stator core  110 . 
     At this time, the support member  60  may be made of a material having elasticity, such as a flat spring. Accordingly, when the support member  60  is coupled to the bracket  200  or the stator core  110 , the support member  60  may be more or less widened. 
     After the support member  60  is coupled to the bracket  200  or the stator core  110 , the support member  60  may be firmly coupled to the bracket  200  or the stator core  110  by the restoring force. 
     Hereinafter, a structure in which the support member  60  is coupled to the bracket  200  or the stator core  100  will be described in detail. 
       FIG. 4  is a perspective view showing the bottom of a support structure of a pickup shaft in a compressor according to an embodiment of the present disclosure, and  FIGS. 5 and 6  show a bracket in a compressor according to an embodiment of the present disclosure. 
     As shown in  FIGS. 4 to 6 , the bracket  200  may be disposed adjacent to the insulator  120 . The bracket  200  may be disposed adjacent to the lower insulator  122 . The bracket  200  may be spaced from the lower insulator  122 . The bracket  200  may be spaced outward from the lower insulator  122 . 
     The bracket  200  may be coupled to the frame  12  with the stator core  110  in between. The bracket  200  may be coupled to the frame  12  by a coupling member (not shown) penetrating the stator core  110 . 
     A plurality of brackets  200  may be provided. The compressor  1  according to an embodiment of the present disclosure may include two brackets  200 . However, the bracket  200  may be configured in various forms, as long as it can couple and support the components installed in the inside of the case  10 . 
     The bracket  200  may include a bracket body  210 , and a first coupling hole  211  formed in the bracket body  210  and coupled to the frame  12 . 
     A plurality of first coupling holes  211  may be formed. The bracket  200  according to an embodiment of the present disclosure may include two first coupling holes  211 , although not limited thereto. 
     The bracket  200  may include a bumper portion  212  to which a bumper member  220  for reducing vibrations of the compressor  1  is coupled. The bumper portion  212  may extend downward from the bracket body  210 . 
     The bumper member  220  may be disposed below the bracket body  210 . 
     A plurality of bumper portions  212  may be provided. The bracket  200  according to an embodiment of the present disclosure may include two bumper portions  212 , although not limited thereto. 
     Also, a plurality of bumper members  220  may be provided to correspond to the number of the bumper portions  212 . 
     The bracket  200  may include a coupling portion  300  which is formed in the bracket body  210  and to which the support member  60  is coupled. 
     The bracket  200  may be made of a material having higher strength than a material forming the insulator  120 . For example, the bracket  200  may be made of steel. 
     Accordingly, compared with a case of coupling the support member  60  for supporting the pickup shaft  50  to the insulator  120 , the compressor  1  according to an embodiment of the present disclosure may couple the support member  60  to the bracket  200 , thereby preventing breakage and abrasion of the coupling portion  300 , while further strengthening coupling of the support member  60 . 
     The coupling portion  300  may be disposed in the center of the bracket body  210 . 
     The coupling portion  300  may include a coupling portion body  310  extending downward from the bracket body  210 , and accommodating space  320  which is formed in the coupling portion body  310  and in which the support member  60  is inserted. 
     Since the coupling portion body  310  is curved downward from the bracket body  210  to form the accommodating space  320 , the coupling portion  300  may form a nearly “U”-shaped groove. 
     The insertion portion  62  (see  FIG. 3 ) inserted in the accommodating space  320  may be positioned between the coupling portion body  310  and the stator core  110 . 
     The area of the accommodating space  320  may be larger than the cross-section area of the support member  60 , and may be equal to or smaller than three times the cross-section area of the support member  60 , although not limited thereto. 
     The coupling portion  300  may be formed by applying a press method on the bracket body  210 . 
       FIGS. 7 and 8  show a bracket in a compressor according to another embodiment of the present disclosure. A bracket  201  according to another embodiment of the present disclosure may have the substantially same structure as the bracket  200  according to the embodiment of the present disclosure, except for the structure of a coupling portion ( 400  in  FIG. 7 ). 
     As shown in  FIGS. 7 and 8 , the bracket  201  may include a bracket body  210 , and a first coupling hole  211  formed in the bracket body  210  to couple the bracket  201  to the frame  12  (see  FIG. 4 ). 
     The bracket  201  may include the bumper portion  212  to which the bumper member  220  (see  FIG. 4 ) for reducing vibrations of the compressor  1  is coupled. The bumper portions  212  may be provided in plural numbers corresponding to the number of the buffer members  220 . Also. 
     The bracket  201  may include a coupling portion  400  which is formed in the bracket body  210  and to which the support member  60  (see  FIG. 4 ) is coupled. 
     The bracket  201  may be made of a material having higher strength than the material forming the insulator  120  (see  FIG. 4 ). For example, the bracket  201  may be made of steel. 
     The coupling portion  400  may be disposed in the center of the bracket body  210 . 
     The coupling portion  400  may include a coupling portion body  410  extending downward from the bracket body  210 , and accommodating space  420  which is formed in the coupling portion body  410  and in which the support member  60  is inserted. 
     The coupling portion  400  may include the coupling portion body  410  curved downward from the bracket body  210 , and the accommodating space  420  forming a hole in the coupling portion body  410 . 
     The insertion portion  62  (see  FIG. 3 ) inserted in the accommodating space  420  may be spaced from the stator core  110  (see  FIG. 4 ). The insertion portion  62  (see  FIG. 3 ) inserted in the accommodating space  420  may be spaced from the bracket body  210 . 
     The diameter of the accommodating space  420  may be larger than the diameter of the support member  60 , and may be equal to or smaller than three times the diameter of the support member  60 , although not limited thereto. 
       FIG. 9  is a perspective view showing the bottom of a support structure of a pickup shaft in a compressor according to another embodiment of the present disclosure.  FIG. 10  shows a coupling portion provided in a stator core in the compressor shown in  FIG. 9 . 
     As shown in  FIGS. 9 and 10 , a bracket  202  according to another embodiment of the present disclosure may be disposed adjacent to the lower insulator  122 . The bracket  202  may be spaced from the lower insulator  122 . The bracket  202  may be spaced outward from the lower insulator  122 . 
     The bracket  202  may be coupled to the frame  12  with the stator core  110  in between. The bracket  202  may be coupled to the frame  12  by a coupling member (not shown) penetrating the stator core  110 . 
     A plurality of brackets  202  may be provided. The bracket  202  according to the other embodiment of the present disclosure may be configured as two pieces, although not limited thereto. However, the bracket  202  may be configured in various forms, as long as it can couple and support the components installed in the inside of the case  10  (see  FIG. 1 ). 
     The bracket  202  may include a bumper member  220  for reducing vibrations of the compressor  1 . A plurality of bumper members  220  may be provided. Two bumper members  220  may be included in each of the brackets  202  according to the other embodiment of the present disclosure, although not limited thereto. 
     The stator core  110  may include a coupling portion  500  which is formed in the stator core  110  and to which the support member  60  is coupled. The coupling portion  500  may be disposed in the outer wall of the stator core  110 . 
     The coupling portion  500  may be disposed at one edge of the stator core  110 . 
     The stator core  110  may be made of a material having higher strength than the material forming the insulator  120 . For example, the stator core  110  may be an electromagnetic steel sheet. 
     Accordingly, compared with the case of coupling the support member  60  for supporting the pickup shaft  50  to the insulator  120 , by coupling the support member  60  to the stator core  110 , it may be possible to prevent breakage and abrasion of the coupling portion  500 , while further strengthening coupling of the support member  60 . 
     The stator core  110  may include a core body  111 , and a winding portion  112  extending inward from the core body  111 , wherein the stator coil  130  (see  FIG. 4 ) is wound around the winding portion  112 . 
     The core body  111  may be in the shape of a circle, and a plurality of winding portions  112  may be provided. The coupling portion  500  may be formed in the core body  111 . 
     The core body  111  may include a first core body  113  to which the bracket  202  is coupled, and a second core body  114  extending from the first core body  113 . 
     The coupling portion  500  may be formed in the first core body  113 , although not limited thereto. 
     The core body  111  may include a second coupling hole  115  which a coupling member (not shown) to be coupled to the frame  12  (see  FIG. 4 ) penetrates. 
     A plurality of second coupling holes  115  may be provided. The core body  111  according to the other embodiment of the present disclosure may include four second coupling holes  115 , although not limited thereto. 
     The stator core  110  may include a plurality of unit cores  110   a  that are stacked on one another. At least one part of the plurality of unit cores  110   a  may include a unit coupling portion  500   a . Since the plurality of unit cores  110   a  are stacked to form the stator core  110 , a plurality of unit coupling portions  500   a  may form the coupling portion  500 . 
     The plurality of unit cores  110   a  including the unit coupling portion  500   a  forming the coupling portion  500  may be disposed below a plurality of different unit cores  110   a , although not limited thereto. 
     The coupling portion  500  may include a groove in which the support member  60  is inserted. The insertion portion  62  inserted in the coupling portion  500  may be positioned on the bracket  202 . 
     The bracket  202  may cover an open side of the coupling portion  500 . 
     The area of the coupling portion  500  may be larger than the cross-section area of the support member  60 , and may be equal to or smaller than three times the cross-section area of the support member  60 , although not limited thereto. 
       FIG. 11  is a perspective view showing the bottom of a support structure of a pickup shaft in a compressor according to another embodiment of the present disclosure.  FIG. 12  shows a coupling portion provided in a unit core in the compressor shown in  FIG. 11 . 
     As shown in  FIGS. 11 and 12 , the bracket  202  according to the other embodiment of the present disclosure may be disposed adjacent to the lower insulator  122 . The bracket  202  may be spaced from the lower insulator  122 . The bracket  202  may be spaced outward from the lower insulator  122 . 
     The bracket  202  may be coupled with the frame  12  (see  FIG. 4 ) with the stator core  110  in between. The bracket  202  may be coupled to the frame  12  by a coupling member (not shown) penetrating the stator core  110 . 
     A plurality of brackets  202  may be provided. The bracket  202  according to the other embodiment of the present disclosure may be configured as two pieces, although not limited thereto. However, the bracket  202  may be configured in various forms, as long as it can couple and support the components installed in the inside of the case  10  (see  FIG. 1 ). 
     The bracket  202  may include the bumper member  220  for reducing vibrations of the compressor  1 . A plurality of bumper members  220  may be provided. The bracket  202  according to the other embodiment of the present disclosure may include two bumper members  220  for each bracket  202 , although not limited thereto. 
     The stator core  110  may include a coupling portion  600  which is formed in the stator core  110  and to which the support member  60  is coupled. The coupling portion  600  may be formed in the outer wall of the stator core  110 . 
     The stator core  110  may be made of a material having higher strength than the material forming the insulator  120 . For example, the stator core  110  may be an electromagnetic steel sheet. 
     The stator core  110  may include a core body  111 , and a winding portion  112  extending inward from the core body  111 , wherein the stator coil  130  (see  FIG. 4 ) is wound around the winding portion  112 . 
     The core body  111  may be in the shape of a circle, and a plurality of winding portions  112  may be provided. The coupling portion  600  may be formed in the core body  111 . 
     The core body  111  may include a first core body  113  to which the bracket  202  is coupled, and a second core body  114  extending from the first core body  113 . The coupling portion  600  may be formed in the second core body  114 , although not limited thereto. 
     The core body  111  may include the second coupling hole  115  which a coupling member (not shown) to be coupled to the frame  12  penetrates. 
     The core body  111  may include a second coupling hole  115  which a coupling member (not shown) to be coupled to the frame  12  (see  FIG. 4 ) penetrates. 
     A plurality of second coupling holes  115  may be provided. The core body  111  according to the other embodiment of the present disclosure may include four second coupling holes  115 , although not limited thereto. 
     The stator core  110  may include a plurality of unit cores  110   a  that are stacked on one another. 
     The coupling portion  600  may be formed in the lowest unit core  110   a  of the plurality of unit cores  110   a . The coupling portion  600  may include a coupling portion body  610  extending downward from the lowest unit core  110   a  of the plurality of unit cores  110   a , and accommodating space  620  which is formed in the coupling portion body  610  and in which the support member  60  is inserted. 
     Since the coupling portion body  610  is curved downward from the lowest unit core  110   a  of the plurality of unit cores  110   a  to form the accommodating space  620 , the coupling portion  600  may form a nearly “U”-shaped groove. 
     Another unit core  110   a  neighboring the lowest unit core  110   a  of the plurality of unit cores  110   a  may be stacked on the lowest unit core  110   a  to cover one side of the accommodating space  620 . 
     The accommodating space  620  may open in both front and rear directions in which the insertion portion  62  (see  FIG. 3 ) is inserted. Accordingly, the coupling portion  600  may form a hole, although not limited thereto. 
     The insertion portion  62  inserted in the accommodating space  620  may be positioned between the plurality of unit cores  110   a.    
     The area of the accommodating space  620  may be larger than the cross-section area of the support member  60 , and may be equal to or smaller than three times the cross-section area of the support member  60 , although not limited thereto. 
     Since oil stored in the case rises along the inner circumferential surface of the rotation shaft, the oil may be efficiently supplied to the individual components even when the rotation shaft rotates at low RPM. 
     Since the coupling portion to which the support member for supporting the pickup shaft is coupled is disposed at the bracket or the stator core having high strength, it may be possible to prevent breakage or abrasion of the coupling portion. 
     Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.