Patent Publication Number: US-2022219128-A1

Title: Magnetic mixer and mixing system including the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     A claim for priority under 35 U.S.C § 119 is made to Korean Patent Application No. 10-2021-0004226 filed on Jan. 12, 2021, in the Korean Intellectual Property Office, the entire contents of which are hereby incorporated by reference. 
     FIELD OF THE INVENTION 
     The present invention relates to a magnetic mixer and a liquid mixing system. More particularly, the present invention relates to a magnetic mixer capable of minimizing mixing of foreign substances, which are generated in components of the magnetic mixer, of a liquid to be mixed, having a simple structure for cleansing a structure supporting an impeller shaft, and capable of securing a sufficient output when a large-scale mixing system with an impeller shaft is configured; and a mixing system including the same. 
     BACKGROUND ART 
     Mixing systems are systems for mixing liquid and liquid, liquid and solid, particulate materials, etc. Such mixing systems have been widely used in a wide range of industries. In the fields of pharmaceutical, bio, food, cosmetics and fine chemical industries, there is a great demand for a mixer which is capable of preventing generation and permeation of foreign substances and can be managed sanitarily. 
     Mixing systems may be classified according to whether an actuator mounted on a mixing tank includes an impeller shaft for driving an impeller. In the case of a small mixing system, a permanent magnet may be embedded in an impeller and a magnetic rotor connected to a driving motor is placed inside the impeller. Thus, in a mixing system equipped with a magnetic mixer having no impeller shaft, driving force loss is small and sufficient RPM can be secured, but it is not easy to perform mixing uniformly in a mixing tank. Therefore, a large mixing system cannot be built. 
     Therefore, generally, a structure in which a driving motor is disposed outside a mixing tank and an impeller shaft equipped with a plurality of impellers is installed inside the mixing tank may be mainly used to configure a large-scale mixing system. 
     In particular, in a mixing system for mixing a pharmaceutical, bio, or fine chemical product among large-scale mixing systems, foreign substances outside a mixing tank should not be mixed with a liquid to be mixed and thus a mixer employing a sealing technique for blocking the inside and outside of the mixing tank by using a mechanical seal is used. 
     The mechanical seal has various hygienic or maintenance problems, such as generation of foreign substances due to deterioration of materials adsorbed or fixed in the vicinity of the mechanical seal during mixing or due to damage of the mechanical seal, low durability of the mechanical seal, etc. 
     In order to prevent this problem, a magnetic mixing technology has been introduced, whereby a driving force is transmitted through magnetic coupling between magnetic units even in a large-scale mixing system to which an impeller shaft is applied. 
     A magnetic mixer including an impeller shaft for configuring a large mixing system includes a structure supporting the impeller shaft in a mixing tank, and thus, a structure for minimizing generation of foreign substances in the structure supporting the impeller shaft, a simple cleaning structure for cleaning generated foreign substances, and securing a sufficient output with the magnetic mixer are outstanding issues. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to providing a magnetic mixer capable of minimizing mixing of foreign substances, which are generated in components of the magnetic mixer, of a liquid to be mixed, having a simple structure for cleansing a structure supporting an impeller shaft, and capable of securing a sufficient output when a large mixing system with an impeller shaft is configured; and a mixing system including the same. 
     In accordance with one aspect of the present invention, the above and other objects can be accomplished by the provision of a magnetic mixer mounted on a mixing tank containing liquids to be mixed, the magnetic mixer comprising: a driving motor mounted outside the mixing tank; a drive shaft driven by the driving motor; a first magnetic unit provided at an end of the drive shaft and including a plurality of magnetic bodies; a top plate including a tank mounting part mounted in the mixing tank through a mounting hole of the mixing tank, a first magnetic unit receiving part configured to allow the first magnetic unit to be rotatably accommodated therein; and a support shaft extending below the first magnetic unit receiving part; a driving member mounted inside the mixing tank to be rotatable about an outside side of the top plate, the driving member including a second magnetic unit provided at the same height as the first magnetic unit; and an impeller shaft connected to the bottom of the driving member, and including at least one impeller. 
     And the driving member may comprise a second magnetic unit embedding part in which the second magnetic unit is embedded; a shaft through part which is connected to the bottom of the second magnetic unit embedding part and through which the support shaft of the top plate passes; and an impeller shaft connection part which is provided below the shaft through part and to which the impeller shaft is connected. 
     And bearing mounting holes each having an expanded inner diameter may be provided at a top and bottom of the shaft through part of the driving member to mount a bearing, wherein the shaft through part of the driving member and the support shaft of the top plate may be supported by the bearing mounted in the bearing mounting holes to be rotatable relative to each other. 
     And in a state in which the bearing may be mounted in the bearing mounting hole in the bottom of the shaft through part, a bearing bolt configured to support the driving member downward may be fastened to the support shaft of the top plate so as to prevent separation of the bearing. 
     And the bearing bolt may comprise a flange configured to support the bearing and block foreign substances from falling between a shaft through part of a body of the impeller and the support shaft of the top plate. 
     And a foreign substance collection groove may be formed in an upper surface of the flange of the bearing bolt. 
     And the shaft connection part of the driving member and an upper end of the impeller shaft may be provided in the form of a flange and fastened together by a fastening member. 
     And the driving member may comprise a washing water inlet through which washing water is introduced. 
     And the first magnetic unit or the second magnetic unit may comprise a pipe-shaped body having at a center a shaft hole in which the drive shaft is mounted or an opening in which the first magnetic unit receiving part of the top plate is disposed; and a plurality of permanent magnets with different polarities arranged alternately at certain intervals on an outer circumferential surface or inner circumferential surface of the pipe-shaped body. 
     And the pipe-shaped body may be formed of a supermalloy or a mu-metal material. 
     And the pipe-shaped body may be formed of an alloy material containing by weight 70% or more of nickel. 
     And the plurality of permanent magnets of the first or second magnetic unit may be spaced apart from each other, and at least some of the plurality of permanent magnets may be embedded in the pipe-shaped body. 
     And the pipe-shaped body may be configured by stacking ring-shaped plates each including a plurality of grooves. 
     And a plurality of impellers may be provided at intervals on the impeller shaft. 
     And the magnetic mixer may further comprise a reducer configured to connect the driving motor and the drive shaft, and a motor shaft of the driving motor may be connected to the reducer in a horizontal direction. 
     In accordance with one aspect of the present invention, the above and other objects can be accomplished by the provision of a mixing system: a mixing system comprising the magnetic mixer of the present invention; and a mixing tank containing liquids or particulate materials to be mixed, wherein the mixing tank comprises: a mounting hole configured to mount therein the tank mounting part of the top plate of the magnetic mixer; a pipe connection hole to which a washing water pipe for supply of washing water is to be connected; and a spray ball with a plurality of injection holes for spraying washing water into the mixing tank. 
     And the spray ball may be provided at a height corresponding to a driving member of the magnetic mixer. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a liquid mixing system according to the present invention; 
         FIG. 2  is a front perspective view of the liquid mixing system of  FIG. 1 ; 
         FIGS. 3A and 3B  illustrate a perspective view and a side view of a magnetic mixer mounted on the liquid mixing system of  FIGS. 1 and 2 , according to the invention; 
         FIG. 4  is an exploded perspective view of a liquid mixing system according to the present invention; 
         FIG. 5  is a cross-sectional view of the magnetic mixer of  FIGS. 3A and 3B ; 
         FIG. 6  illustrates a coupling relationship between a first magnetic unit and a second magnetic unit of a magnetic mixer according to the present invention; and 
         FIGS. 7A to 7D  illustrate cores of a first magnetic unit and a second magnetic unit of a magnetic mixer according to the present invention. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is, however, not limited thereto and may be embodied in many different forms. Rather, the embodiments set forth herein are provided so that this disclosure will be thorough and complete, and fully convey the scope of the invention to those of ordinary skill in the art. Throughout the specification, the same reference numbers represent the same elements. 
       FIG. 1  is a perspective view of a liquid mixing system  1000  according to the present invention.  FIG. 2  is a front perspective view of the liquid mixing system  1000  of  FIG. 1 . 
     The present invention relates to a liquid mixing system  1000  for mixing liquids in the fields of pharmaceutical, bio, food, cosmetics and fine chemical industries, and more particularly, to a magnetic mixer for minimizing generation of foreign substances in a mixing tank  900  and maximizing an output of the magnetic mixer; and the liquid mixing system  1000  including the same. 
     As illustrated in  FIG. 1 , the present invention may include a mixing tank  900 , a magnetic mixer  1 , which is mounted on the mixing tank  900  and will be described below, and a washing water pipe Ip installed inside the magnetic mixer  1  and configured to supply washing water to at least one spray ball  950  including a plurality of injection holes for spraying washing water. 
     The mixing tank  900  may include a plurality of support racks  970  and be configured in a cylindrical chamber shape. 
     A mounting hole  910  in which the magnetic mixer  1  is mounted and a pipe connection part  930  to which the washing water pipe Ip is to be connected may be provided on an upper surface of the mixing tank  900 , and the pipe connection part  930  may be connected to the spray ball  950 . 
     The spray ball  950  may be provided in a spherical shape or in the form of a ball with a plurality of injection holes for spraying washing water in all directions, and configured to clean the magnetic mixer  1  and an inner circumferential surface of the mixing tank  900  with washing water supplied from the washing water pipe Ip after a mixing process is completed, thereby simplifying a cleaning structure. 
     As shown in  FIG. 2 , the spray ball  950  may be provided at a height corresponding to a driving member  600  of the magnetic mixer  1 . As described later, the driving member  600  is a structure in which a support shaft  450  of a top plate  400  and a bearing b are provided and thus foreign substances may be generated or accumulated due to continuous friction and thus may be arranged at a height at which washing water sprayed from the spray ball  950  may be easily supplied to the driving member  600 . A method of washing the inside of the driving member  600  through washing water will be described again below. 
       FIGS. 3A and 3B  illustrate a perspective view and a side view of a magnetic mixer  1  mounted on the liquid mixing system  1000  of  FIGS. 1 and 2 , according to the invention.  FIG. 4  is an exploded perspective view of the liquid mixing system  1000  according to the present invention.  FIG. 5  is a cross-sectional view of the magnetic mixer  1  of  FIGS. 3A and 3B . 
     As described above, the magnetic mixer  1  according to the present invention may have a structure in which an impeller shaft  700  with impellers  800   a  and  800   b  is placed in the mixing tank  900  through the mounting hole  910  in the upper surface of the mixing tank  900  and a reducer  110  and a driving motor  100  are provided on the mixing tank  900 . 
     The magnetic mixer  1  according to the present invention may include: the driving motor  100  outside the mixing tank  900 ; a drive shaft  130  driven by the driving motor  100 ; a first magnetic unit  300  provided at an end of the drive shaft  130  and including a plurality of magnetic bodies; a top plate  400  including a tank mounting part installed inside the mixing tank  900  through the mounting hole  910  of the mixing tank  900 , a first magnetic unit receiving part  430  in which the first magnetic unit  300  is rotatably accommodated, and a support shaft  450  extending below the first magnetic unit receiving part  430 ; the driving member  600  mounted inside the mixing tank  900  to be rotatable about an outer side of the top plate  400  and a second magnetic unit  500  provided at the same height as the first magnetic unit  300 ; and the impeller shaft  700  connected to the bottom of the driving member  600  and including at least one impeller, e.g., the impellers  800   a  and  800   b.    
     A motor shaft of the driving motor  100  may be disposed in a horizontal direction, and the driving motor  100  may be connected to the reducer  110  to perform torque amplification and deceleration. 
     The drive shaft  130  may be mounted downward perpendicularly to the reducer  110 , and the first magnetic unit  300  may be mounted below the drive shaft  130 . 
     The reducer  110  may be mounted on the mixing tank  900 , and a housing  200  may be mounted on the mixing tank  900  to protect the drive shaft  130 . 
     The housing  200  may be configured in a cylindrical pipe shape, and fastening flanges may be provided to respectively mount the reducer  110  and the top plate  400  at the top and bottom of the housing  200 . 
     The top plate  400  may be mounted under the housing  200 . The top plate  400  may allow the first magnetic unit  300  mounted as a rotor on the drive shaft  130  to be disposed rotatably in the mixing tank  900 , and support rotation of the driving member  600  having embedded therein the second magnetic unit  500  provided at a height corresponding to the first magnetic unit  300 . 
     The top plate  400  may include the tank mounting part mounted on the mixing tank  900  through the mounting hole  910  of the mixing tank  900 , the first magnetic unit receiving part  430  accommodating the first magnetic unit  300  therein to be rotatable, and the support shaft  450  extending below the first magnetic unit receiving part  430 . The tank mounting part, the first magnetic unit receiving part, and the support shaft  450  may have circular cross-sections, the outer diameters of which sequentially decrease to form a multistage shape. 
     In the top plate  400  below the housing  200 , the tank mounting part including an upper flange may be interposed between the housing  200  and the mounting hole  910  of the mixing tank  900  so that the housing  200 , the top plate  400 , and the mixing tank  900  may be fastened together. 
     The first magnetic unit receiving part  430  is configured to accommodate the first magnetic unit  300  mounted at the bottom of the drive shaft  130  connected to the reducer  110  so as to be rotatable during the rotation of the driving motor  100 , and may be maintained not to be in contact with the inner circumferential surface of the first magnetic unit receiving part  430  of the top plate  400  and the outer circumferential surface of the first magnetic unit  300 . 
     The support shaft  450  is provided below the first magnetic unit receiving part  430  to support the driving member  600 , which will be described below, to be rotatable. 
     The driving member  600  may be mounted to be rotatable about the outer sides of the first magnetic unit receiving part  430  and the support shaft  450  of the top plate  400  inside the mixing tank  900 . The driving member  600  is configured to rotate the impeller shaft  700  provided with the impellers  800   a  and  800   b  and included in the mixing tank  900 , when the driving motor  100  is driven. 
     Thus, the second magnetic unit  500  magnetically coupled to the first magnetic unit  300  accommodated in the first magnetic unit receiving part  430  of the top plate  400  may be provided on the driving member  600 . 
     Specifically, in the driving member  600 , a second magnetic unit embedding part  610  having the second magnetic unit  500  embedded therein, a shaft through part  630  which is connected to the bottom of the second magnetic unit embedding part  610  and through which the support shaft  450  of the top plate  400  passes, and a shaft connection part  650  provided below the shaft through part  630  and connected to the impeller shaft  700  may be included in a downward direction. 
     The top plate  400  may be fastened to the mixing tank  900 , and the support shaft  450  below the first magnetic unit receiving part  430  may serve as a shaft supporting the rotation of the driving member  600 . 
     The driving member  600  may include the second magnetic unit embedding part  610  having the second magnetic unit  500  embedded therein, the shaft through part  630  which is connected to the bottom of the second magnetic unit embedding part  610  and through which the support shaft  450  of the top plate  400  passes, and the shaft connection part  650  provided below the shaft through part  630  and connected to the impeller shaft  700 . 
     The driving member  600  may have an overall pipe shape, in which the second magnetic unit  500  may be embedded in an upper portion and the shaft connection part  650  of for fastening the impeller shaft  700  may be provided at a lower portion. 
     The top plate  400  is configured to be fixed to the mixing tank  900  and the driving member  600  is configured to be rotatable while being connected to the impeller shaft  700 , and thus, at least one bearing b may be mounted between the top plate  400  and the driving member  600 . 
     To this end, as illustrated in  FIG. 5 , a bearing mounting hole having an expanded inner diameter may be provided to mount the bearing b in the top and bottom of the shaft through part  630  of the driving member  600 , and the shaft through part  630  of the driving member  600  and the support shaft  450  of the top plate  400  may be supported by the bearing b to be rotatable relative to each other. 
     Specifically, an inner ring of each bearing b may be mounted on the support shaft  450  of the top plate  400  and an outer ring thereby may be mounted on the shaft through part  630  of the driving member  600 , i.e., an inner circumferential surface of the bearing mounting hole, thereby providing provide a structure allowing the rotation of the driving member  600 . 
       FIG. 5  illustrates that the bearing mounting hole for mounting two bearings b on the top and bottom of the shaft through portion  630  of the driving member  600  is provided but the number of bearings b may be increased or decreased. 
     A bearing bolt  170  may be fastened to the support shaft  450  of the top plate  400  to prevent separation of the bearing b in a state in which the bearing b is mounted in the bearing mounting hole under the shaft through part  630 . 
     The driving member  600  is rotatably mounted on the support shaft  450  of the top plate  400  through the bearing b but the bearing bolt  170  supports the driving member  600  downward because there is no separate lower support structure. 
     That is, the bearing bolt  170  may include flanges  171  for supporting the bearing b. 
     As shown in the enlarged view of  FIG. 5 , the flanges  171  are regions extending widely from a head of the bearing bolt  170  and may provide a structure supporting the driving member  600  downward by supporting a bottom surface of the bearing b mounted in the bearing mounting hole below the shaft through part  630  of the driving member  600 . 
     The flanges  171  of the bearing bolt  170  may provide a function of preventing foreign substances from falling into the mixing tank  900  due to friction or abrasion of the bearing b or the like, as well as providing the structure supporting the bearing b or the driving member  600  downward. 
     That is, inner circumferential surfaces of the flanges  171  may provide a function of collecting foreign substances while supporting the bottom surface of the bearing b horizontally. Collecting grooves  173  or the like for collecting foreign substances may be formed on the inner circumferential surfaces of the flanges  171  to reinforce the function of collecting foreign substances. 
     The shaft connection part  650  may be provided in the form of a flange under the shaft through part  630  of the driving member  600 . The shaft connection part  650  of the driving member  600  and an upper end  750  of the impeller shaft  700  may be configured in the form of a flange and fastened together by a fastening member to cause the impeller shaft  700  to be rotated during the rotation of the driving member  600 . 
     When a mixing process is completed, the inside of the mixing tank  900  needs to be cleaned. Accordingly, washing water may be sprayed from the spray ball  950  to clean the inner circumferential surface of the stirring tank  900  and the inside of the driving member  600 . 
     To this end, at least one of the second magnetic unit embedding part  610 , the shaft through part  630 , and the shaft connection part  650  of the driving member  600  may include a washing water inlet into which the washing water sprayed from the spray ball  950  may flow. 
     As illustrated in  FIG. 2 , because washing water may be sprayed from the spray ball  950  in all directions, the sprayed washing water may flow through a gap between the second magnetic unit embedding part  610  of the driving member  600  and the first magnetic unit receiving part  430  of the top plate  400  or through washing water inlets of the second magnetic unit embedding part  610  and the shaft through part  630  of the driving member  600 , thereby cleaning foreign substances on the bearing between the shaft through part  630  of the driving member  600  and a shaft support of the top plate  400 , and the like. 
     A washing water outlet may be provided in a flange of an upper portion of the impeller shaft  700  to easily discharge the washing water after the bearing b between the shaft through part  630  of the driving member  600  and the shaft support of the top plate  400  and the like are cleaned. 
     At least one impeller may be provided at intervals on the impeller shaft  700 . Furthermore, a plurality of impellers may be provided at intervals on the impeller shaft  700  according to a capacity of the mixing tank  900  or the like. The shape or type of the plurality of impellers may vary according to the type of a target liquid or particulate material contained in the mixing tank  900  or the height of the impeller shaft. 
     When a plurality of impellers are spaced apart from each other, an entire target liquid contained in the mixing tank  900  may be mixed. 
     The magnetic mixer  1  of the above structure may be mounted in the mixing tank  900  divided into a cover and a main body as illustrated in  FIG. 4 . The housing  200  and the top plate  400  may be mounted on the cover of the mixing tank  900 , the drive shaft  130  equipped with the first magnetic unit  300  may be mounted downward from the top of the top plate  400 . The drive shaft  130  may be mounted on the reducer  110  and the driving motor  100  may be mounted in a lateral direction of the reducer  110 . 
     When the support shaft  450  of the top plate  400  exposed under the cover of the mixing tank  900  is disposed downward, the driving member  600 , the bearing b, and the like may be mounted and the bearing bolt  170  may be fastened to the support shaft  450  of the top plate  400 , so that the bearing b between the shaft through part  630  of the driving member  600  and the support shaft  450  of the top plate  500  may be supported by the bearing bolt  170  to support the driving member  600  downward. 
     In addition, the impeller shaft  700  may be fastened to a shaft connection part at a lower end of the driving member  600 , thereby completing the assembly of the magnetic mixer  1 . 
     In the magnetic mixer  1 , during the rotation of the driving motor  100  a driving force may be transmitted to the drive shaft  130  and the first magnetic unit  300  through the reducer  110 , and the second magnetic unit  500  embedded in the second magnetic unit embedding part  610  of the driving member  600  may be driven to be magnetically coupled to the first magnetic unit  300 , thereby rotating the driving member  600  and the impeller shaft  700  fastened to the driving member  600 . 
     In the mixing system  1000  which is a large-scale system including the impeller shaft  700 , the impeller shaft  700  is long disposed inside the mixing tank  900  and a plurality of impellers are provided at intervals to uniformly mix liquids to be mixed but a driving force is transmitted by magnetic coupling and thus an output of a mixer is limited. 
       FIG. 6  illustrates a coupling relationship between the first magnetic unit  300  and the second magnetic unit  500  of the magnetic mixer  1  according to the present invention.  FIGS. 7A to 7D  illustrate cores of the first magnetic unit  300  and the second magnetic unit  500  of the magnetic mixer  1  according to the present invention. 
     The first magnetic unit  300  illustrated in  FIG. 6  may be mounted at the bottom of the drive shaft  130 , and the second magnetic unit  500  may be embedded in the second magnetic unit embedding part  610  on the driving member  600 . 
     The first magnetic unit  300  may include a pipe-shaped body  330  having at a center a shaft hole  350  in which the drive shaft  130  is mounted, a plurality of permanent magnets  310  embedded in an outer circumferential surface of the pipe-shaped body  330  such that the permanent magnets  310  with different polarities are arranged alternately at certain intervals, and a metal protective layer  370  (see  FIG. 6 ) configured to surround outer sides of the pipe-shaped body  330  and the plurality of permanent magnets  310 . 
     Although not shown in  FIG. 6 , the first magnetic unit  300  may be configured to be rotatable together with the rotation of the drive shaft  130  while being accommodated in the first magnetic unit receiving part  430  of the top plate  400 . 
     The metal protective layer  370  may form an outer circumferential surface of the first magnetic unit  300  and be finished integrally with the first magnetic unit  300  to a boundary of the drive shaft  130  so that the permanent magnets  310  may not be exposed to the outside. The metal protective layer may be formed, for example, of a thin metal tube or by coating a metal. 
     The metal protective layer  370  may be formed to a sufficiently thin thickness to prevent attenuation of magnetic forces of the permanent magnets  310  of the first magnetic unit  300 . 
     Similarly, the second magnetic unit  500  includes a pipe-shaped body  530  with an opening  550  in which the first magnetic unit receiving part  430  of the top plate  400  is rotatably disposed, and a plurality of permanent magnets  510  embedded in an inner circumferential surface of the pipe-shaped body  530  such that the permanent magnets  510  with different polarities are alternately arranged at intervals. The second magnetic unit  500  is embedded in the second magnetic unit embedding part  610  of the driving member  600  and thus the second magnetic unit embedding part  610  of the driving member  600  may serve as a metal protective layer. 
     When the permanent magnets  310  of the first magnetic unit  300  are rotated, the permanent magnets  510  of the second magnetic unit  500  are magnetically coupled to the permanent magnets  310  according to the polarities of the permanent magnets  310  and rotated together with the permanent magnets  310 , thereby mixing target liquids contained in the mixing tank  900 . 
     According to the present invention, a structure for allowing use of the magnetic forces of the permanent magnets  310  and  510  of the first and second magnetic units  300  and  500  as much as possible for magnetic coupling between the first and second magnetic units  300  and  500  is applied to solve an output problem of the magnetic mixer  1 . 
     As illustrated in  FIGS. 7A to 7D , magnetic coupling directions of the first magnetic unit  300  and the second magnetic unit  500  are different, i.e., an outer circumferential direction and an inner circumferential direction. 
     That is, magnetic forces of the permanent magnets  310  of the first magnetic unit  300  should be transmitted in the outer circumferential direction and magnetic forces of the permanent magnets  510  of the second magnetic unit  500  should be transmitted in the inner circumferential direction, so that the permanent magnets  310  and  510  of the first magnetic unit  300  and the second magnetic unit  500  may be coupled to each other by the magnetic forces thereof to transmit driving torque. 
     Accordingly, the first magnetic unit  300  may be mounted such that the plurality of permanent magnets  310  with different polarities are alternately arranged on the outer circumferential surface of the pipe-shaped body  330 , and the second magnetic unit  500  may be mounted such that the plurality of permanent magnets  510  with different polarities are alternately arranged on the inner circumferential surface of the pipe-shaped body  530 . 
     As illustrated in  FIGS. 7A to 7D , an integral body with a long groove for mounting therein permanent magnets may be considered so that the permanent magnets  310  and  510  of the first and second magnetic units  300  and  500  may be mounted and exposed at intervals on an outer or inner circumferential surface of the body, but a method such as elaborate machining or casting should be applied and thus a manufacturing process is difficult and expensive. 
     Accordingly, in the present invention, the pipe-shaped bodies  330  and  530  of the first and second magnetic units  300  and  500  may be configured by stacking ring-shaped plates  331  and  531  each including a plurality of grooves in an outer circumferential surface or an inner circumferential surface in a circumferential direction, so that the permanent magnets  310  and  510  may be mounted to be spaced apart from each other. The ring-shaped plates  331  and  531  each including the plurality of grooves may be easily configured by a method such as punching, thereby reducing manufacturing costs of the bodies  330  and  530 . 
     After stacking the ring-shaped plates  331  and  531  each including the plurality of grooves, permanent magnets may be mounted thereon to fasten the ring-shaped plates  331  and  531  using magnetic forces without performing welding and causing gaps or grooves. 
     It may be assumed that magnitudes of magnetic forces or magnetic fields emitted from the permanent magnets  310  or  510  of the first or second magnetic units  300  or  500  of the magnetic mixer  1  are constant. Therefore, magnetic forces or magnetic fields of the first magnetic unit  300  may be blocked in the inner circumferential direction and magnetic forces or magnetic fields of the second magnetic unit  500  may be blocked in the outer circumferential directions in consideration of magnetic coupling directions of the respective first and second magnetic units  300  and  500 , thereby maximizing strength of magnetic coupling. 
     Although magnetic forces or magnetic fields may be naturally blocked when a thickness of a body or ring-shaped plates constituting the body excluding grooves is increased in a radial direction, an increase in the weight of a magnetic unit increases load on the driving motor  100  and thus increasing the thickness of the body or the ring-shaped plates is not desirable. 
     Accordingly, as illustrated in  FIGS. 7A and 7B , the first magnetic unit  300  may be mounted in a semi-embedded state such that the permanent magnets  310  are exposed in the outer circumferential direction of the body  330 , and thus, magnetic forces or magnetic fields may be completely transmitted in a magnetic coupling direction and may be blocked in an opposite direction (the inner circumferential direction) due to the thickness of the body  330 . 
     For the same reason, as illustrated in  FIGS. 7C and 7D , the second magnetic unit  300  may be mounted in a semi-embedded state such that the permanent magnets  510  are exposed in the inner circumferential direction of the body  530 , and thus, magnetic forces or magnetic fields may be completely transmitted in the inner circumferential direction and may be blocked in an opposite direction (the outer circumferential direction) due to the thickness of the body  530 . 
     Furthermore, it was found that when each of the body  330  of the first magnetic unit  300  and the body  530  of the second magnetic unit  500  was formed of a high permeability metal having a magnetic shielding function, e.g., an alloy material containing by weight 70% or more of nickel, it was meaningful for magnetic field shielding and magnetic field concentration. 
     For example, a material such as supermalloy having super-high permeability or mu-metal (an alloy containing 75% nickel, 20% iron, and 5% copper) may be applied as an example of a high permeability metal used to form the bodies  310  and  510  of the first and second magnetic units  300  and  500  or the ring-shaped plates  331  and  551  constituting the bodies  310  and  510 , but embodiments are not limited thereto. 
     Supermalloy is a type of Mo—Ni—Fe alloy and refers to a metal obtained by heating a non-metal-free material, which is obtained when 5% molybdenum permalloy (5% molybdenum, 79% nickel, and remaining iron) is dissolved in a vacuum without being forcibly deoxidized and is cast in helium or nitrogen gas not to be oxidized, to a high temperature and purifying the non-metal-free material in a hydrogen gas atmosphere and heat-treating a resultant material under optimal heat treatment conditions. 
     At least three surfaces of each permanent magnet was shielded by a body of a magnetic unit formed of such a material as shown in  FIGS. 7A to 7D  and thus a magnetic force or magnetic field of each permanent magnet was focused in a magnetic coupling direction, thereby minimizing load on the driving motor  100  and improving a mixing output by at least 20% or more by the driving motor  100 . 
     In addition, it was found that a mixing output was improved by at least 30% by the driving motor  100  when grooves of the body in which permanent magnets are to be mounted was configured to shield upper and lower surfaces of the permanent magnets. 
     In the magnetic mixer  1  having the above configuration and the mixing system  1000  including the same, although the drive shaft  130  extends into the mixing tank  900 , a driving force can be transmitted between axes by magnetic coupling and thus a magnetic seal for sealing the drive shaft  130  may be omitted, thereby minimizing contamination of fluids to be mixed due to the magnetic seal and the like. The spray ball  950  is disposed near the driving member  600  and a cleaning path is provided inside the driving member  600  to clean the support shaft  450 , and thus, the inside of the mixing tank  900  and the inside of the driving member  600  can be cleaned using washing water sprayed from the spray ball  950  and a pipe structure for cleaning can be minimized, thereby simplifying the system. 
     In addition, a body of each magnetic unit may be formed of a metal with high permeability to maximize output transfer efficiency of the driving motor  100 , and ring-shaped plates may be stacked to form a magnetic unit, thereby minimizing manufacturing costs. 
     According to a magnetic mixer according to the present invention, although a driving motor is provided outside a mixing tank and a drive shaft extends to the mixing tank, a driving force can be transmitted between shafts by magnetic coupling and thus a mechanical seal for sealing a drive shaft and the like may be omitted, thereby minimizing contamination of fluids to be mixed due to the mechanical seal and the like. 
     In addition, according to the magnetic mixer according to the present invention, a cleaning path is provided between a driving member rotatably driven by driving torque transmitted by magnetic coupling and a support shaft and thus cleaning may be performed with washing water sprayed from a spray ball inside the mixing tank, thereby simplifying a pipe structure for cleaning. 
     While the present invention has been described above with respect to exemplary embodiments thereof, it would be understood by those of ordinary skilled in the art that various changes and modifications may be made without departing from the technical conception and scope of the present invention defined in the following claims. Thus, it is clear that all modifications are included in the technical scope of the present invention as long as they include the components as claimed in the claims of the present invention.