Patent Publication Number: US-10323529-B2

Title: Turbine including packing device and method of assembling the same, and sealing assembly

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims priority to Korean Application No. 10-2014-0098281, filed on Jul. 31, 2014, the contents of which are incorporated herein in their entirety. 
     BACKGROUND 
     1. Technical Field 
     An embodiment of the present invention relates to a turbine and, more particularly, to a turbine including a packing device between the rotor shaft and casing of the turbine and a method of assembling the turbine. 
     Furthermore, an embodiment of the present invention relates to a sealing assembly and, more particularly, to a sealing assembly installed between the casing and packing device of the turbine. 
     2. Description of the Related Art 
     A turbine is a power generation apparatus for converting thermal energy of a fluid, such as high-temperature and high-pressure steam or gas generated by a boiler or steam generator, into rotatory power, that is, mechanical energy, and is an apparatus that may be used to generate electric power by driving an electric generator. 
     Referring to  FIG. 1 , a conventional turbine includes a turbine rotor  10  configured to have a plurality of rotating blades  12  mounted on a rotor shaft  11  and a bearing  50  configured to rotatably the rotor shaft to a base stand  20 . The plurality of rotating blades is arranged along the passage of a fluid. A plurality of fixing blades (not illustrated) is provided between the plurality of rotating blades and configured to induce thermal energy of a fluid to be converted into rotatory power. In the flow direction of a fluid, a fluid guide  31  is provided on the downstream side. 
     The conventional turbine further includes a casing  30  configured to accommodate, protect, and support various elements, such as a turbine rotor, and to maintain internal pressure. Both ends of the rotor shaft  11  are extended to the outside of the casing. The bearing  50  is fixed to the base stand  20  outside the casing  30 , and rotatably supports the rotor shaft. Since the rotor shaft  11  is extended outside the casing  30 , a packing ring  41  is provided between the rotor shaft  11  and the casing  30 , thus preventing a fluid from leaking. The packing ring  41  is supported by a support unit  42  fixedly connected to the casing  30 . 
     As indicated by arrows in  FIG. 2 , if internal pressure in the casing  30  is changed, the casing may be moved. For example, internal pressure may be changed by vacuum pressure generated by a part, such as a condenser included in the casing. In this case, the packing ring  41  fixedly connected to the casing  30  is also moved. In contrast, since the rotor shaft  11  is supported by the base stand  20 , the location of the rotor shaft  11  is not changed although the casing  30  is deformed. 
     As described above, the casing is deformed in response to a change in the internal pressure of the casing, whereas the location of the rotor shaft is not changed. Accordingly, it is necessary to design the packing ring so that the packing ring and the rotor shaft have a clearance by taking into consideration deformation of the casing. 
     Accordingly, the amount of an internal fluid that leaks from the inside of the casing to the outside of the casing or the amount of an external gas or external fluid that flows from the outside of the casing to the inside of the casing is affected by the size of the clearance. As a result, efficiency of the turbine is influenced. 
     The conventional turbine is problematic in that the leakage of a fluid within the casing or the introduction of a fluid or gas outside the casing is generated between the packing ring and the rotor shaft because the size of the clearance must be increased by taking into consideration a relative location movement between the packing ring and the casing. 
     SUMMARY 
     Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a turbine capable of being fabricated with a minimized clearance between a packing ring and a rotor shaft because deformation of a casing does not have an influence on a movement in the location of the packing ring although the casing is deformed and thus there is no relative location movement between the packing ring and the rotor shaft and capable of reducing the leakage of a fluid within the casing or the introduction of a fluid or gas outside the casing owing to a reduction of the clearance and a method of assembling the turbine. 
     Furthermore, another object of the present invention is to provide a sealing assembly capable of sealing the space between a packing device and a connection unit although there is a relative location movement between the casing and the packing device due to deformation of the casing. 
     A turbine in accordance with an embodiment of the present invention includes a rotor shaft configured to have a plurality of rotating blades mounted on the rotor shaft, a bearing assembly configured to rotatably support the rotor shaft, a casing configured to form the passage of a fluid and to include a space in which the rotating blades are disposed so that thermal energy of the fluid is converted into mechanical energy by rotation, a foundation configured to fixedly support the bearing assembly, and a packing device installed in the rotor shaft for sealing between the casing and the rotor shaft and supported by the foundation, wherein the casing includes a connection unit extended toward the packing device and fixed to the casing so that the location of the connection unit is relatively changed with respect to the packing device. 
     In accordance with an embodiment of the present invention, the casing further includes the discharge guide of the fluid provided on the downstream side of the passage of the fluid. The connection unit is extended from the discharge guide to the packing device. 
     In accordance with an embodiment of the present invention, the connection unit includes a taper unit extended in the length direction of the rotor shaft. 
     In accordance with an embodiment of the present invention, the taper unit has a shape in which the taper unit is narrowed toward the downstream side of the passage of the fluid. 
     In accordance with an embodiment of the present invention, a first opening and a second opening having a smaller diameter than the first opening are formed in the taper unit. The taper unit includes a taper wall extended from the first opening to the second opening in such a way as to surround the rotor shaft. The second opening side of the taper wall is disposed in the packing device, and the first opening side of the taper wall is fixed to the casing. 
     In accordance with an embodiment of the present invention, the taper unit further includes an extension wall extended from the second opening side of the taper wall to the rotor shaft and extended along the side of the packing device. 
     In accordance with an embodiment of the present invention, the turbine further includes a sealing assembly formed between the second opening side and the packing device. 
     In accordance with an embodiment of the present invention, the connection unit further includes an elastic unit disposed between the taper unit and the packing device, fixed to the taper unit, and configured to have an elastic force. 
     In accordance with an embodiment of the present invention, the elastic unit includes a circular gasket in which wrinkles are formed. 
     In accordance with an embodiment of the present invention, the gasket has an outer circumferential surface fixed to the taper unit and has an inner circumferential surface surround the packing device. 
     In accordance with an embodiment of the present invention, the packing device includes a packing ring installed to surround the outer circumferential surface of the rotor shaft. 
     In accordance with an embodiment of the present invention, the bearing assembly is provided on the side adjacent to the downstream side of the passage of the fluid outside the casing. The packing ring is disposed between the connection unit and the bearing assembly. 
     In accordance with an embodiment of the present invention, at least part of the packing ring is fixed and supported to the foundation. 
     In accordance with an embodiment of the present invention, the packing device further includes a connection housing configured to couple the packing ring and the bearing assembly, and the foundation supports the connection housing. 
     The connection housing includes a packing ring insertion hole into which the packing ring is inserted and a bearing insertion hole into which the bearing assembly is inserted. 
     In accordance with an embodiment of the present invention, the connection housing includes a packing ring fixing unit configured to have the packing ring insertion hole formed in the packing ring fixing unit and to surround the packing ring, a bearing fixing unit configured to have the bearing insertion hole formed in the bearing fixing unit and to surround the bearing assembly, and a connection unit configured to couple the packing ring fixing unit and the bearing fixing unit. 
     Furthermore, a sealing assembly in accordance with an embodiment of the present invention includes a packing device installed in a rotor shaft for sealing between a casing and the rotor shaft and supported by a foundation, a connection unit extended from the casing to the packing device and fixed to the casing so that the location of the connection unit is relatively changed with respect to the packing device, a sealing accommodation groove consecutively formed on one side of the connection unit in the circumferential direction of the connection unit, and a sealing device formed in the sealing accommodation groove and configured to have one end always come in contact with the packing device. 
     In accordance with an embodiment of the present invention, the sealing accommodation groove has a ring form and includes an opening whose some arc is open in the circumferential direction of the sealing accommodation groove. 
     In accordance with an embodiment of the present invention, the sealing device includes an elastic member of a ring shape, and part of the sealing device is seated in the sealing accommodation groove, and the remaining part of the sealing device is protruded through the opening. The protruded portion always comes in contact with the packing device regardless of a movement in the location of the connection unit. 
     In accordance with an embodiment of the present invention, the inside of the sealing device has a shape in which the elastic member having a specific thickness is wound. 
     In accordance with an embodiment of the present invention, the sealing accommodation groove includes a first accommodation unit, a second accommodation unit, and a third accommodation unit in its depth direction from the external surface of the connection unit. The second accommodation unit has a greater width than each of the first accommodation unit and the third accommodation unit. The first accommodation unit is open in the longitudinal direction of the connection unit. 
     In accordance with an embodiment of the present invention, the sealing device includes an elastic unit fixed to the third accommodation unit at the first end of the sealing device and has a second end protruded in a direction in which the first accommodation unit is open. The protruded portion of the second end always comes in contact with the packing device regardless of a movement in the location of the connection unit. The sealing device further includes a central part formed between the first end and the second end, accommodated in the second accommodation unit, and configured to have a width smaller than the second accommodation unit and greater than each of the first accommodation unit and the third accommodation unit. 
     Furthermore, a method of assembling a turbine in accordance with an embodiment of the present invention includes installing a foundation, installing a sealing assembly in the connection unit of a lower casing, installing the connection unit of the lower casing in the lower casing, installing the lower casing in the foundation, installing a lower packing device in the foundation, installing a lower bearing assembly in the connection housing or the foundation; installing a rotor shaft, installing an upper bearing assembly in the rotor shaft, installing the packing device in the rotor shaft, installing the sealing assembly in the connection unit of the upper casing, installing the connection unit of the upper casing in the upper casing, and installing the upper casing in the lower casing. 
     In accordance with an embodiment of the present invention, installing the sealing assembly in the connection unit of the lower casing includes forming a sealing accommodation groove at one end of the connection unit of the lower casing and installing the sealing device in the sealing accommodation groove. 
     In accordance with an embodiment of the present invention, installing the sealing assembly in the connection unit of the upper casing includes forming the sealing accommodation groove at one end of the connection unit of the upper casing and installing the sealing device in the sealing accommodation groove. 
     In accordance with the embodiments of the present invention, the packing device having the same support point as the bearing assembly that supports the rotor shaft is used. Accordingly, a clearance between the packing ring and the rotor shaft can be minimized because deformation of the casing does not have an influence on a movement in the location of the packing ring although the casing is deformed and thus there is no relative location movement between the packing ring and the rotor shaft. Accordingly, there is an advantage in that the leakage of a fluid within the casing or the introduction of a fluid or gas outside the casing can be reduced due to a reduction of the clearance. 
     Furthermore, in accordance with the embodiments of the present invention, although there is a relative location movement of the connection unit with respect to the packing device due to deformation of the casing, the space between the packing device and the connection unit can be sealed because the sealing assembly is adopted. Accordingly, there is an advantage in that the leakage of a fluid within the casing or the introduction of a fluid or gas outside the casing which may be generated between the packing device and the connection unit can be minimized. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side cross-sectional view schematically illustrating a conventional turbine; 
         FIG. 2  is a side cross-sectional view illustrating the state in which vacuum pressure is applied to the turbine of  FIG. 1 ; 
         FIG. 3  is a side cross-sectional view schematically illustrating part of the turbine in accordance with an embodiment of the present invention; 
         FIG. 4  is a perspective view illustrating a modified embodiment of a connection unit that forms the turbine in accordance with an embodiment of the present invention; 
         FIG. 5  is a side cross-sectional view schematically illustrating a modified embodiment of a packing device that forms the turbine in accordance with an embodiment of the present invention; 
         FIG. 6  is a perspective view of a connection housing that forms the embodiment of  FIG. 5 ; 
         FIG. 7  is a side cross-sectional view illustrating the state in which vacuum pressure is applied to the embodiment of  FIG. 5 ; 
         FIG. 8  is a side cross-sectional view illustrating another modified embodiment of the connection unit that forms the turbine in accordance with an embodiment of the present invention; 
         FIG. 9  is a side cross-sectional view illustrating an embodiment in which an elastic unit is included in the connection unit that forms the turbine in accordance with an embodiment of the present invention; 
         FIG. 10  is a side cross-sectional view schematically illustrating a sealing assembly in accordance with an embodiment of the present invention; 
         FIG. 11  is a perspective view schematically illustrating a connection unit that forms the embodiment of  FIG. 10 ; 
         FIG. 12  is a perspective view schematically illustrating a sealing device that forms the embodiment of  FIG. 10 ; 
         FIG. 13  is a side cross-sectional view schematically illustrating a modified embodiment of a sealing accommodation groove and a sealing device in accordance with an embodiment of the present invention; 
         FIG. 14  is a perspective view schematically illustrating the sealing device that form the embodiment of  FIG. 13 ; and 
         FIG. 15  is a flowchart illustrating a method of assembling the turbine in accordance with an embodiment of the present invention. 
     
    
    
     DESCRIPTION OF REFERENCE NUMERALS 
     
         
         
           
               100 ,  100 ′,  100 ″: turbine 
               111 : rotor shaft 
               112 : rotating blade 
               120 : foundation 
               130 : casing 
               140 ,  140 ′: packing device 
               150 : bearing assembly 
               160 ,  160 ′,  160 ″: connection unit 
           
         
       
    
     DETAILED DESCRIPTION 
     Reference will be now made in detail to embodiments of the present disclosure with reference to the attached drawings. It will be understood that words or terms used in the specification and claims shall not be interpreted as the meaning defined in commonly used dictionaries. It will be further understood that the words or terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the technical idea of the disclosure. 
     In the following embodiments, a steam turbine is illustrated as an example, but the present invention is not limited thereto. The spirit of the present invention may be applied to any turbine including a rotor shaft having rotating blades mounted on the passage of a fluid. 
     First, a turbine in accordance with an embodiment of the present invention is described in detail with reference to  FIGS. 3 to 9 . 
     Referring to  FIG. 3 , the turbine  100  in accordance with an embodiment of the present invention includes a rotor shaft  111  configured to have a plurality of rotating blades  112  mounted thereon, a casing  130 , a bearing assembly  150  configured to rotatably support the rotor shaft  111 , a foundation  120 , that is, a structure for supporting the bearing assembly  150 , and a packing device  140  configured to seal the space between the rotor shaft and the casing. Furthermore, although not illustrated, a fixing blade is provided between the rotating blades. 
     The casing  130  includes parts for generating rotatory power by a flow of steam and also includes a space that forms the passage of steam. The plurality of rotating blades  112  and the plurality of fixing blades are disposed in the space so that the rotor shaft  111  is rotated by thermal energy of the steam. The rotating blades and the fixing blades are known elements, and thus a detailed description thereof is omitted. 
       FIG. 3  is a schematic diagram of the structure of the downstream side in the passage of steam of the casing  130 , that is, the structure of the steam discharge side. The casing  130  includes a discharge guide  131  provided on the downstream side of the passage of steam and configured to guide the discharge of steam to the outside of the casing  130 . 
     The casing  130  further includes a connection unit  160  extended toward a packing device  140  and configured to support the packing device  140  in the state in which the connection unit  160  is fixed and connected to the casing  130  and comes in contact with the packing device  140 , but is not fixed to the packing device  140 . 
     On the side of the configuration, the connection unit  160  supporting the packing device  140  is fixed and connected to the casing  130 , and the relative location of the connection unit  160  with respect to the packing device  140  can be changed. As a result, although the casing  130  is deformed, there is no influence on the packing device  140 . Accordingly, a clearance for the design of the packing device  140  can be reduced, and a sealing effect can be improved. The connection unit  160  is described in detail later. 
     The bearing assembly  150  is provided outside the casing  130  and fixed and supported to the foundation  120 . The bearing assembly  150  is configured to rotatably support the rotor shaft  111  and disposed close to the downstream side of the passage of steam, thus supporting the rotor shaft  111 . The bearing assembly  150  has been known, and thus a detailed description thereof is omitted. 
     The packing device  140  is provided between the connection unit  160  and the rotor shaft  111 , and functions to prevent steam from leaking through a gap between the casing  130  and the rotor shaft  111 . The packing device  140  includes a packing ring  141  that surrounds the rotor shaft  111 . 
     A plurality of irregularities is formed in the inner circumferential surface of the packing ring  141 , and thus the inner circumferential surface of the packing ring  141  is engaged with the outer circumferential surface of the rotor shaft  111 . The packing ring  141  may include any known labyrinth seal. 
     The foundation  120  is a structure that is fixed and supported to the packing ring  141 . Furthermore, the foundation  120  supports the bearing assembly  150 . A groove  121  into which the packing ring  141  is inserted is formed in the foundation  120 . A method of fixing the packing ring  141  to the foundation  120  is not limited to the method using the groove. For example, the packing ring  141  may be fixed to the foundation  120  using a separate coupling member. The foundation  120  may be made of solid materials, such as concrete. 
     There is an advantage in that the packing ring  141  and the bearing assembly  150  have the same support point because both they are supported by the foundation  120  on the side of the configuration. Accordingly, there is an advantage in that the packing ring  141  can be firmly supported although it is not fixed and connected to the casing  130 . 
     The connection unit  160  comes in contact with the packing ring  141 , but it is fixed and connected to only the casing  130  and installed so that the location of the connection unit  160  is relatively changed with respect to the packing ring  141 . The connection unit  160  may include a support leg fixed and connected to the casing  130  and extended toward the packing ring  141  so that the end of the support leg on the part of the packing ring  141  supports the packing ring  141 . A plurality of the support legs may be provided and fixed to the casing  130  in a symmetrical form around the rotor shaft  111 . If the connection unit  160  includes the plurality of support legs, the support legs are disposed so that steam does not leak therebetween. 
       FIG. 4  is a perspective view illustrating a modified embodiment  160 ′ of the connection unit. Referring to  FIGS. 3 and 4 , the connection unit  160 ′ may include a taper unit  161  fixed and connected to the casing  130 , extended in the length direction of the rotor shaft  111 , and configured to have one end support the packing ring  141 . 
     The taper unit  161  has a form in which it is narrowed toward the downstream side of the passage of steam. The taper unit  161  may include a taper wall  165  configured to have a first opening  162  and a second opening  164  having a smaller diameter than the first opening formed at both ends of the taper wall  165  and extended from the first opening to the second opening in such a way as to surround the rotor shaft  111 . 
     The second opening  164  is disposed on the part of the packing ring  141  to support the side of the packing ring  141 , and the first opening  162  is fixed to the casing  130 . In this case, the second opening  164  has a diameter that is the same as or smaller than the diameter of the outer circumference of the packing ring  141 . 
       FIG. 5  is a side cross-sectional view schematically illustrating a modified embodiment  140 ′ of the packing device that forms the turbine in accordance with an embodiment of the present invention. The modified embodiment  140 ′ of the packing device that forms the turbine in accordance with an embodiment of the present invention has been modified from the packing device  140  of the aforementioned embodiment. In other words, the packing device  140  in accordance with an embodiment of the present invention is an embodiment in which the packing ring  141  is directly supported by the foundation  120 . In contrast, the packing device  140 ′ that forms a modified embodiment of the packing device of the present invention is an embodiment in which the packing device  140 ′ further includes a connection housing  143  and it is supported by the foundation  120  through the connection housing  143 . Hereinafter, the modified embodiment  140 ′ of the packing device is described, and the same reference numerals as those of the aforementioned embodiment are used and a description thereof is omitted. 
     The modified embodiment  140 ′ of the packing device includes the aforementioned packing ring  141  and further includes the connection housing  143  that couples the packing ring  141  and the bearing assembly  150 .  FIG. 6  is a perspective view of the connection housing  143 . 
     Referring to  FIGS. 5 and 6 , the connection housing  143  has a cylindrical form in which a packing ring insertion hole  144  into which the packing ring  141  is inserted and a bearing insertion hole  146  into which the bearing assembly  150  is inserted are formed. In  FIGS. 5 and 6 , the connection housing  143  has been illustrated as having a stepped and cylindrical shape, but the present invention is not limited thereto. For example, the connection housing  143  may be modified to have any shape that couples the packing ring  141  and the bearing assembly  150  so that they are supported by the foundation  120 . Furthermore, the connection housing  143  may be modified in various ways depending on the diameter of the packing ring  141  and the diameter of the bearing assembly  150 . 
     For example, the connection housing  143  includes a packing ring fixing unit  145  configured to have the packing ring insertion hole  144  formed therein and to surround the packing ring  141 , a bearing fixing unit  147  configured to have the bearing insertion hole  146  formed therein and to surround the bearing assembly  150 , and a connection wall  149  configured to couple the packing ring fixing unit  145  and the bearing fixing unit  147 . 
     The connection wall  149  includes a stepped jaw because the packing ring fixing unit  145  and the bearing the fixing unit  147  have different diameters. In some embodiments, the connection wall  149  may be formed with a slant. 
     The packing ring  141  may be formed to have the same support point as the bearing assembly  150  because the packing ring  141  and the bearing assembly  150  are accommodated in the single connection housing  143  on the side of the aforementioned configuration. The connection housing  143  is easily supported by the foundation  120 . 
     Referring to  FIG. 7 , although the casing  130  is moved in the direction of arrows due to a change of pressure in the aforementioned configuration, the packing ring  141  is not influenced by such a movement and is firmly supported by the foundation  120  through the medium of the connection housing  143 . Furthermore, the connection unit  160 ,  160 ′ extended from the casing  130  to the packing ring  141  support the side of the packing ring  141 , but the locations thereof are relatively changed with respect to the packing ring  141 . 
       FIG. 8  is a side cross-sectional view illustrating another modified embodiment  160 ″ of the connection unit that forms the turbine in accordance with an embodiment of the present invention. A turbine  100 ″ according to yet another modified embodiment  160 ″ includes a modified example  161 ′ of the aforementioned taper unit, and the remaining elements are assigned the same reference numerals as those of the aforementioned embodiment and a description thereof is omitted. 
     The taper unit  161 ′ may further include an extension wall  166  extended from the second opening  164  of the taper wall  165  to the rotor shaft  111 , but extended along the side of the packing ring  141 . The extension wall  166  can further improve a sealing effect. 
       FIG. 9  is a side cross-sectional view illustrating an embodiment in which an elastic unit  167  is included in the connection unit  160 ,  160 ′ that forms the turbine in accordance with an embodiment of the present invention. That is, the elastic unit  167  is provided in the aforementioned connection unit  160 ,  160 ′. The remaining elements are assigned the same reference numerals as those of the aforementioned embodiment, and a description thereof is omitted. 
     The elastic unit  167  is disposed between the taper unit  161  and the packing ring  141  and fixed to the taper unit  161 . Furthermore, the elastic unit  167  may be made of materials having an elastic force or may be formed to be flexible by an elastic shape. 
     For example, the elastic unit  167  may be a circular gasket in which wrinkles have been formed. In this case, the gasket may be formed to have an outer circumferential surface fixed to the taper unit  161  and to have an inner circumferential surface surround the packing ring  141 . 
     A sealing assembly in accordance with an embodiment of the present invention is described in detail below with reference to  FIG. 10  to  FIG. 14 . 
     A part directly related to an element that belongs to the elements of in the turbine  100 ,  100 ′,  100 ′ and that functions as a sealing action between the packing device  140 ,  140 ′ and the connection unit  160 ,  160 ′  160 ″ may be called a sealing assembly  1000 . 
     As illustrated in  FIG. 10 , the sealing assembly  1000  in accordance with an embodiment of the present invention includes a packing device  1400 , a connection unit  1600 , a sealing accommodation groove  1610 , and a sealing device  1620 . 
     The packing device  1400  and the connection unit  1600  correspond to the packing device  140 ,  140 ′ and the connection unit  160 ,  160 ′  160 ″ forming the turbine of the aforementioned embodiments or the modified embodiments thereof, and thus a detailed description thereof is omitted. 
     The sealing accommodation groove  1610  may be consecutively formed on one side of the connection unit  1600  in the circumferential direction of the connection unit  1600 . For example, one side of the connection unit  1600  may be one side of the second opening  164  that forms the turbine  100 ′,  100 ″ in accordance with an embodiment of the present invention. 
     The sealing accommodation groove  1610  has a ring form and may have an opening in which part of the cylindrical groove of the sealing accommodation groove  1610  is open when the connection unit  1600  is viewed in a lateral cross section. The width of the opening may be smaller than the diameter of the groove. 
     As illustrated in  FIG. 11 , the sealing device  1620  may be formed in a ring form so that it is inserted into the sealing accommodation groove  1610 . Furthermore, the sealing device  1620  may be formed of an elastic member for the purpose of a sealing action for preventing the leakage of a fluid or the introduction of a fluid or gas which is generated between the packing device  1400  and the connection unit  1600 . For example, the inside of the sealing device  1620  may have a form in which an elastic member having a specific thickness is wound.  FIG. 12  is a perspective view of an embodiment of the connection unit  1600  in which the sealing device  1620  has been installed in the sealing accommodation groove  1610 . 
     Referring back to  FIG. 10 , part of the sealing device  1620  is seated in the sealing accommodation groove  1610 , and the remaining part thereof is protruded to the outside of the opening. Part of the protruded part comes in contact with one end of the packing device  1400 . 
       FIG. 13  is a side cross-sectional view schematically illustrating a modified embodiment of the sealing accommodation groove and the sealing device in accordance with an embodiment of the present invention. 
       FIG. 13  is a side cross-sectional view schematically illustrating a modified embodiment  1610 ′ of the sealing accommodation groove and a modified embodiment  1620 ′ of the sealing device in accordance with an embodiment of the present invention. The modified embodiment  1610 ′ of the sealing accommodation groove and the modified embodiment  1620 ′ of the sealing device in accordance with an embodiment of the present invention have been modified from the sealing accommodation groove  1610  and sealing device  1620  of the aforementioned embodiment. In other words, the sealing accommodation groove  1610  and the sealing device  1620  in accordance with an embodiment of the present invention are formed on one side of the connection unit  1600  as described above. The modified embodiment  1610 ′ of the sealing accommodation groove and the modified embodiment  1620 ′ of the sealing device are also formed on one side of the connection unit  1600  like the sealing accommodation groove  1610  and the sealing device  1620  in accordance with an embodiment of the present invention. Furthermore, the sealing device  1620  in accordance with an embodiment of the present invention is formed of the elastic member of a ring shape and always brought in contact with one end of the packing device  1400 . The sealing accommodation groove  1610  is formed so that the sealing device  1620  is accommodated in the connection unit  1600 . The modified embodiment  1620 ′ of the sealing device has a member having an elastic force in one end thereof in order to secure an elastic force and has the other end formed to always come in contact with the packing device  1400 . The sealing accommodation groove  1610  is formed so that the other end of the modified embodiment  1620 ′ is accommodated in the connection unit  1600 . As described above, the modified embodiment  1620 ′ has the same configuration and function as the sealing device  1620  in accordance with an embodiment of the present invention. 
     The modified embodiment  1610 ′ of the sealing accommodation groove and the modified embodiment  1620 ′ of the sealing device are described below. The remaining elements are assigned the same reference numerals as those of the aforementioned embodiment, and a description thereof is omitted. 
     As illustrated in  FIG. 13 , the sealing accommodation groove  1610 ′ includes a first accommodation unit  1611 , second accommodation unit  1612 , and third accommodation unit  1613  that are formed in the depth direction of the connection unit  1600  from the outside surface of the connection unit  1600  on one side thereof. The sealing accommodation groove  1610 ′ is formed on one side of the connection unit  1600  in the circumferential direction of the connection unit  1600 , but may have a “+” shape when the connection unit  1600  is viewed in a lateral cross section. Accordingly, the second accommodation unit  1612  has a greater width than the first accommodation unit  1611  and the third accommodation unit  1613 . Furthermore, the first accommodation unit  1611  may be open in the longitudinal direction of the connection unit  1600  so that the protruded portion of the sealing device  1620 ′ is protruded from the sealing accommodation groove  1610  toward one end of the packing device  1400 . 
     The sealing device  1620 ′ includes an elastic unit  1621  fixed to the first accommodation unit  1611  on one end of the sealing device  1620 ′, a protrusion  1623  protruded in the direction in which the third accommodation unit  1613  is open on the other end of the sealing device  1620 ′, and a central part  1622  accommodated in the second accommodation unit  1612  at the center of the sealing device  1620 ′. The protruded portion of the protrusion  1623  always comes in contact with the packing device  1400  regardless of a movement in the location of the connection unit  1600 . The central part  1622  has a smaller width than the second accommodation unit  1612 , but may have a greater width than the first accommodation unit  1611  and the third accommodation unit  1613 . For example, the elastic unit  1621  may be a spring.  FIG. 14  is an embodiment of the sealing device  1620 ′. 
     The packing device  140 ,  140 ′ that forms the turbine  100 ′  100 ″ in accordance with an embodiment of the present invention on the side of the aforementioned configuration is not moved because it has the same support point as the bearing assembly  150  supporting the rotor shaft  111  although the casing  130  is deformed. In contrast, the location of the connection unit  160 ,  160 ′ is changed when the casing  130  is deformed because the connection unit  160 ,  160 ′ is fixed and supported by the casing  130 . Accordingly, as illustrated in  FIG. 7 , there is a problem in the leakage of a fluid within the casing  130  or the introduction of a fluid or gas outside the casing  130  between the connection unit  1600  and the packing device  1400  because the location of the connection unit  1600  is relatively moved with respect to the packing device  1400 . In contrast, the present embodiment is advantageous in that a sealing effect can be improved because the sealing device  1620 ,  1620 ′ has an elastic force and part of the sealing device  1620 ,  1620 ′ always comes in contact with one end of the packing device  1400  regardless of such a relative location movement. 
     In some embodiments, the sealing accommodation groove  1610 ,  1610 ′ and the sealing device  1620 ,  1620 ′ are not formed in the connection unit  1600 , but may be likewise formed in the packing device  1400 . 
     A method of assembling the turbine in accordance with an embodiment of the present invention is described in detail below with reference to  FIG. 15 . 
     As illustrated in  FIG. 15 , the method of assembling the turbine  100 ,  100 ′,  100 ″ in accordance with an embodiment of the present invention includes installing the foundation at step S 100 , installing a lower casing at step S 200 , fixing the bearing assembly and the packing device so that they are supported by the foundation and installing the rotor shaft so that it is supported by the bearing assembly and the packing device at step S 300 , and installing the upper casing at step S 400 . 
     Steps S 100  to S 400  are described in detail below. 
     First, the foundation  120  that supports and fixes the elements of the turbine  100 ,  100 ″ in accordance with an embodiment of the present invention is installed. 
     Thereafter, before the lower casing  130  is installed in the foundation  120 , the connection unit  160 ,  160 ′ is installed at one end of the casing  130 , and the sealing assembly  1000 ,  1000 ′ is installed in the connection unit  160 ,  160 .′ 
     Installing the sealing assembly  1000 ,  1000 ′ in the connection unit  160 ,  160 ′ includes forming the sealing accommodation groove  1610 ,  1610 ′ at one end of the connection unit and installing the sealing device  1620 ,  1620 ′ in the sealing accommodation groove  1610 ,  1610 .′ 
     Thereafter, the bearing assembly  150  and the packing device  140 ,  140 ′ are installed in the foundation  120 , and the rotor shaft  111  is installed in the bearing assembly  150  and the packing device  140 ,  140 .′ 
     In this case, prior to the operation of the turbine  100 ,  100 ′,  100 ″, the elastic force of the sealing device  1620 ,  1620 ′ is controlled so that the protruded portion of the sealing device  1620 ,  1620 ′ applies specific pressure to the packing device  140 ,  140 ′. Accordingly, the protruded portion of the sealing device  1620 ,  1620 ′ performs a sealing action while always coming in contact with the packing device  140 ,  140 ′ although there is a relative location movement between the connection unit  160 ,  160 ′ and the packing device  140 ,  140 .′ 
     Accordingly, the assembly of elements that belong to the elements of the turbine  100 ,  100 ′,  100 ″ in accordance with an embodiment of the present invention and that form the elements of a lower half part is completed. 
     The assembly of the elements of the remaining upper half part is performed in reverse order of steps S 100 ˜S 300 . That is, the packing device  140 ,  140 ′ and the bearing assembly  150  are installed in the rotor shaft  111 , and the upper casing  130  is installed over the lower casing  130 . As in the lower casing  130 , the connection unit  160 ,  160 ′ is installed in the upper casing  130 , and the sealing assembly  1000 ,  1000 ′ is installed in the connection unit  160 ,  160 .′ As in the sealing assembly  1000 ,  1000 ′ of the connection unit  160 ,  160 ′ installed in the lower casing  130 , the sealing accommodation groove  1610 ,  1610 ′ and the sealing device  1620 ,  1620 ′ are installed in the sealing assembly  1000 ,  1000 ′ of the connection unit  160 ,  160 ′ installed in the upper casing  130 . Furthermore, the task for controlling an elastic force is also performed for the purpose of a sealing action between the connection unit  160 ,  160 ′ and the packing device  140 ,  140 .′ 
     Further, the embodiments discussed have been presented by way of example only and not limitation. Thus, the breadth and scope of the invention(s) should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents. Moreover, the above advantages and features are provided in described embodiments, but shall not limit the application of the claims to processes and structures accomplishing any or all of the above advantages. 
     Additionally, the section headings herein are provided for consistency with the suggestions under 37 CFR 1.77 or otherwise to provide organizational cues. These headings shall not limit or characterize the invention(s) set out in any claims that may issue from this disclosure. Specifically and by way of example, although the headings refer to a “Technical Field,” the claims should not be limited by the language chosen under this heading to describe the so-called technical field. Further, a description of a technology in the “Background” is not to be construed as an admission that technology is prior art to any invention(s) in this disclosure. Neither is the “Brief Summary” to be considered as a characterization of the invention(s) set forth in the claims found herein. Furthermore, any reference in this disclosure to “invention” in the singular should not be used to argue that there is only a single point of novelty claimed in this disclosure. Multiple inventions may be set forth according to the limitations of the multiple claims associated with this disclosure, and the claims accordingly define the invention(s), and their equivalents, that are protected thereby. In all instances, the scope of the claims shall be considered on their own merits in light of the specification, but should not be constrained by the headings set forth herein.