Abstract:
Disclosed is a two-liquid-type, double-row structured trochoid pump for transferring high-viscosity liquids under high pressure. A front body, a first housing, a center body, a second housing, and a rear body are successively coupled to form an outer body, and a first idler is coupled to an inside of the first housing. A first rotor is inserted into the first idler, a second idler is coupled to an inside of the second housing, and a second rotor is inserted into the second idler. A shaft is coupled to penetrate the front body, the first housing, the center body, the second housing, the rear body, and the first and second rotors, and the shaft is connected to an external electric motor. Accordingly, transfer equipment can be reduced in size and weight through reduction of an attachment and a controller, which constitute the transfer equipment, into one device.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This Application is a Section 371 National Stage Application of International Application No. PCT/KR2014/008200, filed Sep. 2, 2014, the contents of which is hereby incorporated by reference in its entirety. 
     
    
     TECHNICAL FIELD 
       [0002]    The present invention relates to a trochoid pump, and more particularly, to an integrated trochoid pump, which can operate two rotors and thus can substitute for two existing trochoid pumps that are equipped in parallel to transfer two different kinds of high-viscosity liquids under high pressure. 
       BACKGROUND OF THE INVENTION 
       [0003]    In general, a trochoid pump is a representative displacement pump in which the flow rate is in proportion to the rotating speed of a motor. 
         [0004]    The trochoid pump is composed of a rotor connected to a driving shaft of a motor to transfer a rotating force, and an idler coupled to the rotor to be rotated by driving of the rotor. In the trochoid pump, the rotor and the idler are eccentrically provided with a predetermined gap between them to move liquids 
         [0005]    Korean Registered Patent No. 10-0964517 discloses “oil pump rotor”. This patent relates to an oil pump having a trochoid screw thread, which is provided with an inner rotor having an outer screw thread formed thereon and an outer rotor having an inner screw thread formed thereon to be engaged with the outer screw thread of the inner rotor. 
         [0006]    On the other hand, in the case of transferring high-viscosity liquids having two different properties, it is required to use two trochoid pumps in the related art that are mounted in parallel, and thus duplicate controllers and attachments are also required to be installed. Accordingly, the size of the device is increased, and a separate large installation space is required. Actually, due to the increase of a pipeline loss that is caused by a long length of a gun for discharging the high-viscosity liquids, a large-capacity motor or a primary pump for transferring the high-viscosity liquids is required, and thus nonproductive management factors are increased to cause unnecessary or unreasonable points to remain. 
       SUMMARY OF THE INVENTION 
       [0007]    Accordingly, the present invention has been made to solve the aforementioned problems occurring in the related art, and one subject to be achieved by the present invention is to provide a trochoid pump, which can substitute for two existing trochoid pumps in transferring two different kinds of high-viscosity liquids, and thus can unify attachments required for liquid transfer and duplicate controllers, can minimize an installation space through miniaturization and light weight of the pump, and can be directly mounted on robot arms or the like at industry sites. 
       TECHNICAL SOLUTION 
       [0008]    To achieve the above and other subjects, in accordance with an embodiment of the present invention, there is provided a trochoid pump, which includes a front body having a first discharge port formed on an outer surface thereof, a first discharge flow path formed on an inside thereof to communicate with the first discharge port, a first through-hole formed in the center thereof, and a plurality of fastening holes formed on a circumference of the first through-hole; a first housing coupled to the front body and having both open ends and a path formed in the center thereof; a first idler rotatably inserted into the path of the first housing and having a gear groove formed on an inside thereof; a first rotor inserted into the gear groove of the first idler with a diameter that is smaller than the gear groove, and having a plurality of gears formed on an outer periphery thereof; a center body coupled to the first housing through one side thereof and having a second through-hole formed in the center thereof to coincide with the first through-hole; a second housing coupled to the other side of the center body and having both open ends and a path formed in the center thereof; a second idler rotatably inserted into the path of the second housing and having a gear groove formed on an inside thereof; a second rotor inserted into the gear groove of the second idler with a diameter that is smaller than a diameter of the gear groove, and having a plurality of gears formed on an outer periphery thereof; a rear body having a second discharge port formed on an outer surface thereof, a second discharge flow path formed on an inside thereof to communicate with the second discharge port, a second through-hole formed in the center thereof, and a plurality of fastening holes formed on a circumference of the second through-hole; and a shaft coupled to the first through-hole of the front body, the first rotor, and the second rotor, and coupled to the second through-hole of the rear body after penetrating the first idler and the second idler to be rotated by a rotating force that is transferred from an external motor. 
         [0009]    Preferably, on the front body, two of the first discharge flow path and the first discharge port are symmetrically formed on both sides of the first through-hole, a first bypass line for connecting two of the first discharge flow paths that are symmetrically formed is formed, and a bypass valve or a return valve is formed on the first bypass line. 
         [0010]    Preferably, on the rear body, two of the second discharge flow path and the second discharge port are symmetrically formed on both sides of the second through-hole, a second bypass line for connecting two of the second discharge flow paths that are symmetrically formed is formed, and a bypass valve or a return valve is formed on the second bypass line. 
       ADVANTAGEOUS EFFECT 
       [0011]    According to the present invention, since one trochoid pump can substitute for two existing gear pumps or two existing trochoid pumps in transferring two different kinds of high-viscosity liquids, the attachment and the controller of the transfer equipment can be unified into one device, and thus the transfer equipment can be miniaturized and light-weighted. 
         [0012]    Accordingly, the installation area can be minimized without the necessity of providing a separate wide installation area as in the related art. Further, since the trochoid pump according to the present invention can be directly mounted on robot arms or the like, unnecessary management and control factors can be greatly reduced, and thus the efficiency of the whole transfer equipment can be heightened and the cost can be greatly saved. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The above subjects, other features and advantages of the present invention will become more apparent by describing the preferred embodiments thereof with reference to the accompanying drawings, in which: 
           [0014]      FIG. 1  is an exploded perspective view of a trochoid pump according to an embodiment of the present invention; 
           [0015]      FIG. 2  is a cross-sectional view of a trochoid pump according to an embodiment of the present invention; 
           [0016]      FIG. 3  is a view illustrating high-viscosity liquid transfer equipment to which a trochoid pump according to an embodiment of the present invention is applied; and 
           [0017]      FIG. 4  is a view illustrating high-viscosity liquid transfer equipment in which a trochoid pump according to an embodiment of the present invention is directly mounted on a robot arm. 
       
    
    
     EXPLANATION OF REFERENCE NUMERALS FOR MAIN PARTS IN THE DRAWINGS 
       [0018]      10 : first idler 
         [0019]      12 ,  22 : gear groove 
         [0020]      20 : second idler 
         [0021]      30 : first rotor 
         [0022]      32 : gear 
         [0023]      40 : second rotor 
         [0024]      100 : front body 
         [0025]      101 : first discharge port 
         [0026]      103 : second charging port 
         [0027]      105 : first charging flow path 
         [0028]      200 : first housing 
         [0029]      201 : path 
         [0030]      300 : center body 
         [0031]      400 : second housing 
         [0032]      500 : rear body 
         [0033]      503 : second charging port 
         [0034]      505 : second charging flow path 
         [0035]      510 : second discharge port 
         [0036]      520 : second discharge flow path 
         [0037]      530 : second through-hole 
         [0038]      600 : shaft 
       DETAILED DESCRIPTION OF THE INVENTION 
       [0039]    Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
         [0040]      FIG. 1  is an exploded perspective view of a trochoid pump according to an embodiment of the present invention, and  FIG. 2  is a cross-sectional view of a trochoid pump according to an embodiment of the present invention.  FIG. 3  is a view illustrating high-viscosity liquid transfer equipment to which a trochoid pump according to an embodiment of the present invention is applied, and  FIG. 4  is a view illustrating high-viscosity liquid transfer equipment in which a trochoid pump according to an embodiment of the present invention is directly mounted on a robot arm. 
         [0041]    As illustrated in  FIGS. 1 and 2 , a trochoid pump A according to an embodiment of the present invention includes a front body  100 , a first housing  200 , a center body  300 , a second housing  400 , and a rear body  500 , which are successively coupled and penetratingly fastened by a long bolt (not illustrated) to form an outer body. 
         [0042]    A first idler  10  is coupled to an inside of the first housing  200 , and a first rotor  30  is inserted into an inside of the first idler  10 . 
         [0043]    A second idler  20  is coupled to an inside of the second housing  400 , and a second rotor  40  is inserted into an inside of the second idler  20 . 
         [0044]    A shaft  600  is penetratingly coupled to the front body  100 , the first housing  200 , the center body  300 , the second housing  400 , the rear body  500 , the first rotor  30 , and the second rotor  40 . 
         [0045]    An external motor (not illustrated) is connected to the shaft  600 . 
         [0046]    The front body  100  is in the shape of a circular plate, and includes a first discharge port  101  formed on an outer surface thereof, a first discharge flow path  102  formed on an inside thereof to communicate with the first discharge port  101 , a first through-hole  104  formed in the center thereof, and a plurality of fastening holes formed on a circumference of the first through-hole  104 . 
         [0047]    The first housing  200  is in the shape of a circular plate having the same diameter as the diameter of the front body  100 , and is coupled to the front body  100 . The first housing  200  has both open ends and a path  201  formed in the center thereto. 
         [0048]    The first idler  10  is inserted into and coupled to the path  201  of the first housing  200  to be rotatable with a fine gap between the first idler  10  and the path  201 . The first idler  10  may be rotated along the inner periphery of the path  201  of the first housing  200 , and a gear groove  12 , which includes a plurality of gears  122  that project to form a star shape, is formed on an inside of the first idler  10 . 
         [0049]    The first rotor  30  is inserted into the gear groove  12  of the first idler  10 , and has a plurality of gears  32  formed on an outer periphery thereof. The first rotor  30  has a diameter that is smaller than the diameter of the gear groove  12  so that the first rotor  30  comes in contact with the inside of the gear groove  12 , and the plurality of gears  32  project to form a star shape. 
         [0050]    Here, the number of the gear grooves  12  of the first idler  10  is larger than the number of gears of the first rotor  30  by 1, and the gears  32  of the first rotor  30  that come in contact with the inside of the gear grooves  12  are engaged with the gears  122  of the gear grooves  12  of the first idler  10  while pushing and rotating the gears  122  of the gear grooves  12 . 
         [0051]    Accordingly, the volume between the gears  32  and the gears  122  is changed to repeat charging and discharging of the transferred liquids. 
         [0052]    As an example, the number of gears of the first idler  10  is 9, and the number of gears of the first rotor  30  having inner threads is 8. 
         [0053]    Of course, the number of gears may be diversely changed. 
         [0054]    Since the coupling and operation of the second rotor  40  and the second idler  20  are the same as those of the first rotor and the first idler, the duplicate explanation thereof will be omitted. 
         [0055]    The center body  300  is in the shape of a circular plate having the same diameter as the diameter of the first housing  200 . The center body  300  is coupled to the first housing  200  through one side thereof, and has a second through-hole  530  formed in the center thereof to coincide with the first through-hole  104 . 
         [0056]    The second housing  400  is in the shape of a circular plate that is coupled to the other side of the center body  300 , and has both open ends and a path  401  formed in the center thereof. 
         [0057]    The second idler  20  is rotatably inserted into the path  401  of the second housing  400 , and has a gear groove  22  formed on an inside thereof. 
         [0058]    The second rotor  40  is inserted into the gear groove  22  of the second idler  20 , and has a plurality of gears  42  formed on an outer periphery thereof. The second rotor  40  has a diameter that is smaller than the diameter of the gear groove  22 . 
         [0059]    It is preferable that the number of gears  42  of the second rotor  40  that comes in contact with the inside of the gear grooves  22  of the second idler  20  is different from the number of the gears of the first idler  10  or the first rotor  30  by the same number. 
         [0060]    The rear body  500  has a second discharge port  510  formed on an outer surface thereof, a second discharge flow path  520  formed on an inside thereof to communicate with the second discharge port  510 , a second through-hole  530  formed in the center thereof, and a plurality of fastening holes formed on the circumference of the second through-hole  530 . 
         [0061]    The shaft  600  is coupled to the first through-hole  104  of the front body  100 , the first rotor  30 , and the second rotor  40 , and is also coupled to the second through-hole  530  of the rear body  500  after penetrating the first idler  10  and the second idler  20  to be rotated by a rotating force that is transferred from an external motor. 
         [0062]    On the other hand, on the front body  100 , the first charging port  103  and the first discharge port  101  are symmetrically formed on both sides of the first through-hole  104 , and the first charging flow path  105  is formed to communicate with the first charging port  103  and the gear groove  12  of the first idler  10 . Further, the first discharge flow path  102  is formed to communicate with the first discharge port  101 . 
         [0063]    A first bypass line BL- 1  is formed to communicate with the first discharge flow path  102  and the first charging flow path  105  to make an excessive discharge amount withdrawn to the first charging flow path  105 , and a bypass valve V or a return valve is formed on the first bypass line BL- 1 . 
         [0064]    Accordingly, an excessive amount of high-viscosity liquids is withdrawn to the first bypass line BL- 1  as the bypass valve V or the return valve is opened in the first discharge flow path  102 , and thus the liquids re-circulate to the first charging flow path  105  on the other side. 
         [0065]    On the rear body, the second discharge port  503  and the second discharge port  510  are symmetrically formed on both sides of the second through-hole  530 , and the second charging flow path  505  is formed to communicate with the gear groove  22  of the second idler  20  through the second charging port  503 . Further, the second discharge flow path  520  is formed to communicate with the second discharge port  510 . 
         [0066]    A second bypass line BL- 2  is formed to communicate with the second discharge flow path  520  and the second charging flow path  505  to make an excessive discharge amount withdrawn to the second charging flow path  505 , and a bypass valve V or a return valve is formed on the second bypass line BL- 2 . 
         [0067]    Accordingly, an excessive amount of high-viscosity liquids is withdrawn to the second bypass line BL- 2  as the bypass valve V or the return valve is opened in the second discharge flow path  520 , and thus the liquids re-circulate to the second charging flow path  505  on the other side. 
         [0068]    The operation of the trochoid pump as constructed above will now be described. 
         [0069]    If the shaft  600  is rotated by the rotating force that is transferred from the external motor, the first rotor  30  and the second rotor  40  are rotated, and thus the first idler  10  and the second idler  20  that are gear-engaged with the first rotor and the second rotor are also rotated. 
         [0070]    Accordingly, the gear teeth of the rotor and the gear teeth of the idlers  10  and  20  rotatably engaged with each other while the gear teeth push and rotate the gear teeth of the idlers  10  and  20 . In this case, the volume between the engaged gear teeth is changed to repeat charging and discharging of the transferred liquids. 
         [0071]    The high-viscosity liquids A which flow in from the first charging flow path  105  and the first charging port  130  and are pressed by the first rotor  30  are discharged through the first discharge flow path  102  and the first discharge port  101 . 
         [0072]    As illustrated in  FIG. 3 , the two-liquid type trochoid pump A according to the present invention is connected to a speed reducer R and a servo motor S, and the high-viscosity liquids A are supplied from a primary pump device P- 1 . 
         [0073]    The high-viscosity liquids A which flow in from the second charging flow path  505  and the second charging port  503  and are pressed by the second rotor  40  are discharged through the second discharge flow path  520  and the second discharge port  510 . 
         [0074]    The high-viscosity liquids B is supplied from a secondary pump device P- 2 . 
         [0075]    In addition, the excessive amount of high-viscosity liquids that is discharged in the trochoid pump A is withdrawn through the first bypass line BL- 1  or the second bypass line BL- 2  to re-circulate. 
         [0076]    Accordingly, the two kinds of high-viscosity liquids can be simultaneously supplied under high pressure through the two-liquid type trochoid pump A, and thus it becomes possible to discharge the two kinds of high-viscosity liquids through a discharge gun G. 
         [0077]    On the other hand, as illustrated in  FIG. 4 , the two-liquid type trochoid pump A according to the present invention may be mounted on a robot arm R, and liquid A and liquid B, which are high-viscosity liquids, are supplied from the primary pump P- 1 . In this case, since the high-viscosity liquids are directly transferred to the discharge gun G through a pump of the robot arm R, waste of the installation space can be prevented, a pressure loss on the pipeline can be reduced, and the capacity of the motor can be reduced for optimization. 
         [0078]    Although the present invention has been described with reference to the preferred embodiment in the attached figures, it is to be understood that various equivalent modifications and variations of the embodiments can be made by a person having an ordinary skill in the art without departing from the spirit and scope of the present invention as recited in the claims. 
       INDUSTRIAL APPLICABILITY 
       [0079]    According to the trochoid pump according to the present invention, since one trochoid pump can substitute for two existing gear pumps or two existing trochoid pumps in transferring two different kinds of high-viscosity liquids, the attachment and the controller of the transfer equipment can be unified into one device, and thus the transfer equipment can be miniaturized and light-weighted. Further, the installation area can be minimized without the necessity of providing a separate wide installation area. Further, since the trochoid pump according to the present invention can be directly mounted on robot arms or the like, unnecessary management and control factors can be greatly reduced, and thus the efficiency of the whole transfer equipment can be heightened and the cost can be greatly saved.