Abstract:
A rotary compressor having a reduced vibration and noise thereof, and capable of minimizing the deformation of components to improve the performance and the reliability, thereby providing applications for various fields other than for an air conditioner

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of Korean Patent Application No. 2011-0121146, filed on Nov. 18, 2011 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND 
       [0002]    1. Field 
         [0003]    Embodiments of the present disclosure relate to a rotary compressor, and more particularly, to a rotary compressor having an enhanced support structure thereof. 
         [0004]    2. Description of the Related Art 
         [0005]    In general, a compressor is an apparatus configured to compress a fluid such as air or refrigerant by applying a pressure thereon by receiving a power from a driving apparatus such as an electric motor and to discharge the compressed fluid, and is used in a product such as an air conditioner or a refrigerator. 
         [0006]    A compressor is divided into a positive displacement-type compressor and a turbo-type compressor, and the positive displacement-type compressor includes a rotary compressor configured to compress a fluid by a roller that eccentrically rotates at an inside of a cylinder. 
         [0007]    A rotary compressor is provided with a case including a sealed accommodating space at an inside thereof and having a suction hole and a discharging port, a driving portion installed at an inside the case, a compression portion connected to the driving portion and configured to compress a refrigerant, and an accumulator communicating with the compression portion while being connected to the suction port of the case. 
         [0008]    At this time, a suction pipe is connected to one side of the case to receive a fluid from the accumulator, and the suction pipe is welded to the suction port of the case. 
         [0009]    The compression portion is fixed by welding, and the driving portion is press-fitted to the case as the compression portion is fixed by welding. At this time, the aligning of the compression portion and the driving portion may be twisted, and in a case when the aligning is twisted, the performance of the compressor is decreased and noise is developed from the compressor. In addition, as the driving portion is press-fitted to the case, the noise and vibration of the driving portion and compression portion are delivered to the case, thereby resulting in greater noise and vibration when compared to other types of compressors. 
       SUMMARY 
       [0010]    Therefore, it is an aspect of the present disclosure to provide a rotary compressor capable of improving the performance thereof and reducing noise and vibration thereof. 
         [0011]    Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the disclosure. 
         [0012]    In accordance with one aspect of the present disclosure, a rotary compressor includes a case, a driving portion, a compression portion, a fastening portion and a supporting portion. The case may form an external appearance of the rotary compressor. The driving portion may be provided at an inner side of the case, and have a stator fixed to the case, a rotator rotatively provided at an inside the stator, and a rotary shaft that is press-fitted the rotator. The compression portion may be provided at an inner side of the case, and have an eccentric portion provided at a lower portion of the rotary shaft, a roller rotatively inserted into an outer side of the eccentric portion, a cylinder accommodating the roller and provided for a compression chamber to be formed therein, and a vane configured to divide the compression chamber. The fastening member may be configured to connect the driving portion to the compression portion. The supporting member may be configured to connect the compression portion to the case to support the compression portion. 
         [0013]    The supporting member may include a first elastic member to support the compression portion, and a second elastic member to connect the fastening member to the case. 
         [0014]    The supporting member may be a damper configured to couple the fastening member to the case and to absorb vibration. 
         [0015]    The rotary compressor may further include an upper portion bearing coupled to an upper portion of the cylinder and configured to support the rotary shaft, and a lower bearing coupled to a lower portion of the cylinder and configured to support the rotary shaft. One of both sides of the fastening member is coupled to the stator of the driving portion. 
         [0016]    The other side of the fastening member may be coupled to the upper portion bearing. 
         [0017]    The other side of the fastening member may be coupled to the cylinder. 
         [0018]    At least one portion of the fastening member may be provided with a hole used as a channel of refrigerant. 
         [0019]    The rotary compressor may further include an accumulator configured to filter a liquefied refrigerant, and a suction tube configured to supply refrigerant gas from the accumulator to the compression portion. The suction tube may be formed with flexible material to prevent vibration and noise of the compression portion from being delivered to the case. 
         [0020]    The rotary compressor may further include a suction tube to supply refrigerant gas to the compression portion. The suction tube may be formed in an elongated manner so that the suction tube is bent at an inside the case to prevent noise and vibration of the compression portion from being delivered to the case. 
         [0021]    In accordance with another aspect of the present disclosure, a method of manufacturing a rotary compressor having a case forming an external appearance of the rotary compressor, a compression portion and a driving portion therein is as follows. 
         [0022]    The compression portion is assembled. A rotator of the driving portion is inserted into a rotary shaft. The driving portion is assembled to the compression portion by inserting a fixation member configured to maintain a distance in between the rotator and a stator of the driving portion. The stator of the driving portion is assembled to a fastening member, which connects the driving portion to the compression portion. The compression portion may be fastened to the fastening member. The fixation member may be separated from the driving portion. An assembly of the driving portion and the compression portion is mounted to an elastic member at an inside of the case. 
         [0023]    The fastening member may be assembled to a cylinder provided at the compression portion. 
         [0024]    The fastening member may be assembled to an upper portion bearing provided at the compression portion. 
         [0025]    The fasten member may be fastened through a press-fitting using heat. 
         [0026]    The fastening member may be fastened by a coupling member. 
         [0027]    As described above, vibration and noise of a rotary compressor may be reduced, thereby enhancing the performance and reliability of the compressor. Accordingly, a rotary compressor may be used for various fields other than for an air conditioner. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0028]    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: 
           [0029]      FIG. 1  is a drawing illustrating a rotary compressor in accordance with one embodiment of the present disclosure. 
           [0030]      FIG. 2  is a drawing illustrating a rotary compressor in accordance with another embodiment of the present disclosure. 
           [0031]      FIG. 3  is a drawing illustrating a rotary compressor in accordance with still another embodiment of the present disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0032]    Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. 
         [0033]      FIG. 1  is a drawing illustrating a rotary compressor in accordance with one embodiment of the present disclosure. 
         [0034]    As illustrated on  FIG. 1 , a rotary compressor  100  according to the embodiment of the present disclosure includes a case  1  forming an exterior, a driving portion  10  to generate a driving power, and a compression portion  20  to compress refrigerant gas by receiving the driving power of the driving portion  10 . The driving portion  10  and the compression portion  20  are installed at an inside of the case  1  which is sealed and has the shape of a cylinder. 
         [0035]    One side of a lower portion of the case  1  is connected to a suction tube  40  that is configured to supply refrigerant gas from an accumulator  2  to the compression portion  20 . The accumulator  2  is configured to filter a liquefied refrigerant. An upper portion of the case  1  is provided with a discharging portion  7  installed thereto to discharge the refrigerant gas that is compressed at the compression portion  20 . The discharging portion  7  may be formed in a shape of a tube, and is connected to an outside of the case  1 . A lower portion of the case  1  is provided thereon with an oil storage space  8  in which a certain amount of oil is filled for the lubrication and the cooling of a member in friction motion. 
         [0036]    A supporting member is provided on a lower portion of the case  1  to support an assembly of the compression portion  20  and the driving portion  10 . A first elastic member  5  is illustrated on  FIG. 1  as an example of the supporting member, but is not limited hereto, and a damper may be installed on the lower portion of the case  1 . A supporting member may be provided on a lateral side of the case  1  to support an assembly of the compression portion  20  and the driving portion  10 . A second elastic member  6  is illustrated on  FIG. 1  as an example of the supporting member to support the compression portion  20  and the driving portion  10 , but not limited hereto, and a damper may be installed on the lateral side of the case  1 . In addition, both the first elastic member  5  and the second elastic member  6  are not needed to be provided, and one of the first elastic member  5  and the second elastic member  6  may be provided to reduce vibration, and the change of the position of the first elastic member  5  and the second elastic member  6  may be possible. 
         [0037]    The first elastic member  5  and the second elastic member  6  are mounted to the case  1 , and are insertedly mounted to the case  1  through a groove (not shown) configured for the first elastic member  5  and the second elastic member  6  to be mounted to the case  1 . The first elastic member  5  and the second elastic member  6  are compressed through a pre-loading. 
         [0038]    The driving portion  10  includes a stator  12 , a rotator  11  rotatively supported at an inside the stator  12 , and a rotary shaft  13  press-fitted to the rotator  11 . As a power is applied to the stator  12 , the rotator  11  is rotated by an electromagnetic force, and the rotary shaft  13  integrally formed with the rotator  11  through press-fitting delivers the rotation force to the compression portion  20 . 
         [0039]    The compression portion  20  includes an eccentric portion  21  formed at one side of a lower portion of the rotary shaft  13 , a roller  22  insertedly installed at an outer side of the eccentric portion  21 , and a cylinder  25  provided to form compression chambers  51  and  52  at which the roller  22  is accommodated. In addition, the compression portion  20  may include an upper portion bearing  23  and a lower portion bearing  24  that are provided to support the rotary shaft  13  while being coupled to an upper portion and a lower portion of the cylinder  25 , respectively, to seal the compression chambers  51  and  52 . 
         [0040]    One side of the cylinder  25  is provided therein with a suction port  33  that is connected to the suction tube  40  connected to the accumulator  2  to supply refrigerant, and the other side of the cylinder  25  is provided with a discharging port (not shown) to guide the refrigerant gas compressed at the compression chambers  51  and  52  to an outside the compression chambers  51  and  52 . 
         [0041]    One side of the upper portion bearing  23  is provided with a discharging hole  231  that communicates with the discharging port such that the refrigerant gas guided to the discharging port is discharged to an outside. An upper portion of the upper portion bearing  23  at a side of the discharging hole  231  is provided with a valve apparatus (not shown) to open/close the discharging hole  231 . 
         [0042]    A carbon dioxide refrigerant and oil are introduced through the suction port  33  and are supplied to the compression chambers  51  and  52 , and each of the compression chambers  51  and  52  is filled with the oil. The oil functions as to help the motion of the compression portion  20  smoothly. 
         [0043]    The supporting member is configured to enable the driving portion  10  and the compression portion  20  to be spaced apart from the case  1  by a predetermined space. The driving portion  10  and the compression portion  20  are fastened to the case  1  through a fastening member  30 . 
         [0044]    As the driving portion  10  and the compression portion  20  are fastened to the case  1  through the fastening member  30  and the elastic members  5  and  6 , vibration and noise may be reduced. In addition, the likeliness of the degradation of the performance by having the alignment twisted may be reduced. 
         [0045]    An upper side of the fastening member  30  is fastened to the stator  12  of the driving portion  10  through bolting or press-fitting. A lower side of the fastening member  30  is fastened to the compression portion  20 , and according to the illustration on  FIG. 1 , the lower side of the fastening member  30  is fastened to the upper portion bearing  23  through bolting or press-fitting. In a case when the lower side of the fastening member  30  is fastened to the upper portion bearing  23 , the upper portion bearing  23  is extended in sideways for the fastening with the fastening member  30 . The fastening member  30  may be fastened to the cylinder  25 , and in the case as such, the upper portion bearing  23  may not need to be extended. 
         [0046]    In a case when the fastening member  30  is fastened to the cylinder  25 , as the cylinder  25  is formed with material having rigidity higher than that of the upper portion bearing  23 , the likeliness of deformation thereof is low. However, in a case when the fastening member  30  is fastened to the upper portion bearing  23 , as the upper portion bearing  23 , unlike the cylinder  25 , does not directly affect the performance of the rotary compressor  100 , the performance and the reliability of the rotary compressor  100  is not largely affected even in a case of an occurrence of a deformation of the upper portion bearing  23 . 
         [0047]    The fastening member  30  may include a hole  31  to discharge the high-pressure refrigerant. In a case when the high-pressure refrigerant is discharged through the hole  31 , as the high-pressure refrigerant is discharged through a larger space, the flux of discharged oil may be reduced, compared to the conventional rotary compressor. 
         [0048]    The suction tube  40  configured to supply the refrigerant gas from the accumulator  2  to the compressor portion  20  may be formed with flexible material to prevent the noise and vibration of the driving portion  10  and the compression portion  20  from being delivered to the case  1 . A rubber tube, a type of Teflon tube, as an example, may be used. 
         [0049]    The fastening member  30  needs a rigidity corresponding to the case  1 , and thus the fastening member  30  may be formed with material that is the same as the material of the case  1 . Steel, as an example, may be used. 
         [0050]      FIG. 2  is a drawing illustrating a rotary compressor in accordance with another embodiment of the present disclosure, and  FIG. 3  is a drawing illustrating a rotary compressor in accordance with still another embodiment of the present disclosure. 
         [0051]    The embodiment illustrated on  FIG. 2  represents a case when a damper  15  is used as a supporting member. Even in a case when the damper  15  is used as the supporting member, vibration and noise may be reduced similar to the case when an elastic member is used as the supporting member. One side of the damper  15  is press-fitted to the case  1 , and the other side of the damper  15  is press-fitted or bolted to the fastening member  30 . 
         [0052]    In addition, the suction tube  41  is formed in an elongated manner in length thereof and is bent at an inside the case  1 , and is connected to the accumulator  2  through a lower side of the case  1 . As the suction tube  41  has a great length, vibration is eased even if the driving portion  10  and the compression portion  20  are moved. In addition, in the case as such, the material forming the suction tube  41  is not limited to flexible material. 
         [0053]    The embodiment illustrated on  FIG. 3  represents a case where suction tubes  48  and  49  are formed in an elongated manner at an inside of the case  1  so as to be connected to an outside of the case  1 . As the suction tubes  48  and  49  are formed in an elongated manner, the delivery of the vibration of the driving portion  10  and the compression portion  20  to the case  1  may be prevented. In addition, since a portion  49  of the suction tubes  48  and  49 , which is bent to connect to an upper portion of the case  1 , performs similar to the accumulator, the accumulator may be omitted, and thereby, the compressor may be reduced in size. 
         [0054]    For the rotary compressor  100  according to the embodiment of the present disclosure, the compression portion  20  is assembled, the rotator  11  of the driving portion  10  is inserted into rotary shaft  13 , and a fixation member (not shown) is inserted in between the rotator  11  and the stator  12  of the driving portion  10  to form a space therebetween, thereby assembling the driving portion  10 . 
         [0055]    The stator  12  of the driving portion  10  is assembled to the fastening member  20  that connects the driving portion  10  to the compression portion  20 , the compression member  20  is coupled to the fastening member  30 , and the fixation member is separated from the driving portion  10 . The fastening member  30  may be assembled to the cylinder of the compressor portion  20 . The fastening member  30  may be assembled to the upper portion bearing  23  provided at the compression portion  20 , and for such, a portion of the upper portion bearing  23  making contact with the compression portion  20  is needed to be expanded. 
         [0056]    The fastening member  30  may be fastened to the compression portion  20  and the driving portion  10  through the press-fitting using heat. 
         [0057]    An assembly of the driving portion  10  and the compression portion  20  may be mounted to the supporting member mounted at an inside the case  1 . 
         [0058]    In the method as such, a channel of the discharged refrigerant may be formed, thereby reducing the flux of discharged oil of the compressor. In addition, as the driving portion  10  is not press-fitted to the case  1 , the likeliness of the vibration and noise of the rotary compressor  100  delivered to an outside through the case  1  is reduced. 
         [0059]    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.