Patent Publication Number: US-2021190054-A1

Title: Pump

Description:
TECHNICAL FIELD 
     The present invention relates to a pump for compressing a sucked fluid in a compression chamber and delivering the compressed fluid from an outlet port. 
     BACKGROUND ART 
     Conventionally, various types of pumps for compressing fluid have been known, for example, a reciprocating pump described in Patent Document 1 is known. As shown in  FIG. 17 , a drive of this pump includes: a cylindrical pump cylinder ( 110 ) of a certain size; upper and lower cylinder heads ( 120 ,  120 ′) that are coupled to upper and lower stages of the pump cylinder  110  in a hermetically sealed manner and have suction valves ( 121 ,  121 ′) and delivery valves ( 122 ,  122 ′) formed on both sides respectively; a pump piston ( 130 ) that is installed inside the pump cylinder ( 110 ), has a long hole ( 131 ) formed in the center therethrough, and has rack gears ( 132 ,  132 ′) formed to protrude on the centerlines of left and right vertical planes of the long hole ( 131 ); a drive motor (not shown) that is coupled to the center of one side of the outer surface of the pump cylinder ( 110 ) and has a rotating shaft ( 141 ) positioned on the centerline of the long hole ( 131 ) of the pump piston ( 130 ); and a pinion gear ( 150 ) that has teeth ( 152 ) of a toothed gear formed to protrude within a certain angle on a gear body ( 151 ) wherein the gear is coupled to the rotating shaft ( 141 ) of the drive motor to be engaged and rotated with the rack gears ( 132 ,  132 ′). In this configuration, a rotating cam ( 153 ) is coupled to a rotating shaft of the pinion gear ( 150 ), and a certain rotating space ( 133 ) is formed on one side of the rack gears ( 132 ,  132 ′) of the pump piston ( 130 ) corresponding to the rotating cam ( 153 ); however, for smooth operation of the rack gears ( 132 ,  132 ′) and the pinion gear ( 150 ), the pump piston ( 130 ) is forcibly moved up and down a certain distance in contact with upper and lower ends of the rotating space ( 133 ) when the rotating cam ( 153 ) is rotated. 
     Further, pressure buffer chambers ( 123 ,  123 ′) having certain space are formed outside the suction valves ( 121 ,  121 ′) and the delivery valves ( 122 ,  122 ′), and springs ( 160 ,  160 ′) with constant elastic force are disposed between the upper and lower cylinder heads ( 120 ,  120 ′) and corresponding ends of the pump piston ( 130 ), respectively. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Korean Patent No. 10-0781391 
     SUMMARY OF INVENTION 
     Technical Problem 
     In the reciprocating pump employing the drive motor configured as described above, since the rotating cam ( 153 ) contacts the upper and lower ends of the rotating space ( 133 ), a problem is that noise that can be generated by the rack gears ( 132 ,  132 ′) and the rotating cam ( 153 ) is large. 
     Although various forms of devices for preventing such noise can be considered, another problem is that it is impossible to reduce the size of the reciprocating pump when an additional soundproofing member is used to reduce the noise of the reciprocating pump employing the drive motor. 
     Further, in the reciprocating pump employing this drive motor, while the piston is reciprocated up and down by the rack gears ( 132 ,  132 ′), the pinion gear ( 150 ), and the rotating cam ( 153 ), there is a concern that this may cause a problem in gear durability. 
     An object of the present invention, which has been made in view of the above described problems, is to provide a pump in which fluid is fed out through piping by compression and vacuum in a compression chamber due to linear reciprocating motion of a drive part, so as to provide a low-noise product and an energy-efficient pump. 
     Another object of the present invention is to provide a high output pump which achieves a larger delivery volume of suction fluid with the same energy so that it can form higher pressure in a compression chamber. 
     A further object of the present invention is to provide a high capacity pump which achieves a larger delivery volume of suction fluid with the same product size. 
     A further object of the present invention is to provide a pump having excellent low noise and excellent durability in which a frictional surface of a drive part is minimized to a central oil-less bushing to provide reversible and smooth driving. 
     Solution to Problem 
     A pump according to the present invention is a pump having a suction port for sucking a fluid, a compression chamber for compressing the sucked fluid, and an outlet port for feeding out the compressed fluid, the pump including: a drive source having a rotating shaft; a rotating part having a central portion connected to the rotating shaft and having at least one pair of rotating-side magnets of different magnetic poles arranged in a circumferential direction; and a drive part including at least one pair of linear-motion-side magnets of different magnetic poles wherein the at least one pair of linear-motion-side magnets is arranged so as to correspond to the at least one pair of magnets of the rotating part, wherein the drive part is mounted to be able to move close to or away from the rotating part and able to perform linear reciprocating motion within the compression chamber by suction force or repulsive force between the rotating-side magnets and the liner-motion-side magnets that is displaced by rotation of the rotating part. 
     Further, the pump according to the present invention preferably includes: a housing head in which the suction port and the outlet port are formed; a wheel housing that houses the rotating part and the drive part; and a housing that rotatably holds the rotating shaft and fixes the drive source. 
     Further, in the pump according to the present invention, it is preferable that the housing head and the wheel housing are fixed via a fixing step of a drive membrane. 
     Further, in the pump according to the present invention, it is preferable that the compression chamber is defined by at least the housing head and the drive membrane. 
     The above summary of the invention does not enumerate all the necessary features of the invention, and a sub-combination of these features may also be an invention. 
     Advantageous Effects of Invention 
     According to the pump of the present invention, the drive part is driven by suction force and repulsive force of magnets, so that direct friction between parts is reduced, noise and wear are reduced, and durability is improved, and further the suction force and repulsive force of the magnets which are stronger in orthogonal direction are obtained, and the drive part is driven in linear reciprocating motion by generation of energy which is stronger than force for rotation, and thereby highly efficient energy can be obtained, and the drive part is driven while the magnets are displaced, and thereby excellent sealing force of the compression chamber is obtained, so that a high output pump having a higher delivery pressure relative to required energy and a high efficiency pump having a smaller product size relative to delivery volume can be provided. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a sectional view of a schematically arranged pump according to the present invention. 
         FIG. 2  is a perspective view showing some partially coupled components of a motor and a housing of the pump according to the present invention. 
         FIG. 3  is a perspective view showing some partially coupled components including the housing, a thrust bearing, and an inserted rotating shaft of the pump according to the present invention. 
         FIG. 4  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein the thrust bearing is inserted in the rotating shaft. 
         FIG. 5  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein a wheel housing is coupled with the housing. 
         FIG. 6  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein a key is coupled to the rotating shaft and a rotating plate. 
         FIG. 7  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein the rotating plate is fixed by a fixing nut to the rotating shaft. 
         FIG. 8  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein magnets are inserted in the rotating plate. 
         FIG. 9  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein a drive membrane is mounted and assembled on the wheel housing. 
         FIG. 10  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein magnets are inserted in the rotating plate and coupled to the rotating part. 
         FIG. 11  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein magnets are inserted in the drive membrane and coupled to the drive part. 
         FIG. 12  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein a compression chamber is in a vacuum state. 
         FIG. 13  is a perspective view showing some extracted and enlarged components of the pump according to the present invention wherein a compression chamber is in a compressed state. 
         FIG. 14  is a perspective view showing an appearance of the pump according to the present invention. 
         FIG. 15  is an extracted and enlarged perspective view of a magnet of the pump according to the present invention. 
         FIG. 16  is an extracted and enlarged perspective view of a housing head of the pump according to the present invention. 
         FIG. 17  is a configuration diagram showing a schematic block diagram of a reciprocating pump of the conventional art. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and not all the combinations of features described in the embodiments are necessarily essential for the solution of the invention. 
       FIG. 1  is a sectional view in which some components of a pump are schematically arranged, and the pump includes a motor  10  as a drive source, a housing  20 , a wheel housing  30 , a housing head  40 , thrust bearings  52 ,  53 , a fixing pin  51 , a rotating plate  60 , a rotating part  70 , a drive part  80 , a drive membrane  90 , and check valves  43 ,  44 , which are coupled together;  FIG. 2  is a perspective view showing some extracted and enlarged components wherein the motor  10  and the housing  20  are fixedly coupled;  FIG. 3  is a perspective view showing some extracted and enlarged components wherein a rotating shaft  50  is inserted in a motor shaft  11  and coupled therewith by the fixing pin  51  being inserted in a pin hole  12  of the motor shaft and a pin hole  55  of the rotating shaft;  FIG. 4  is a perspective view showing some extracted and enlarged components wherein the thrust bearings  52 ,  53  are coupled to the rotating shaft  50 ;  FIG. 5  is a perspective view showing some extracted and enlarged components wherein the housing  20  and the wheel housing  30  are coupled with each other (not shown), and a key  34  is inserted in and coupled to a key portion  19  of the rotating shaft  50 ;  FIG. 6  is a perspective view showing some extracted and enlarged components wherein the key  34  is inserted in the key portion  19  of the rotating shaft  50  and a key portion  69  of the rotating plate  60 , so that the rotating shaft and the rotating plate are coupled with each other as if frozen, and threaded portions  64 ,  65  are formed to which fixing nuts are coupled to fix the rotating part  70  to the rotating plate;  FIG. 7  is a perspective view showing some extracted and enlarged components wherein the rotating shaft  50  and the rotating plate  60  are coupled with a fixing nut  13  so as to be coupled not to be separated and detached from each other;  FIG. 8  is a perspective view showing some extracted and enlarged components wherein magnets  67 ,  68 , which form rotating-side magnets, are inserted in and coupled to the rotating plate  60 ;  FIG. 9  is a perspective view showing some extracted and enlarged components wherein a fixing step  91  of the drive membrane  90  is coupled to a fixing portion  39  of the wheel housing  30 ;  FIG. 10  is a perspective view showing some extracted and enlarged components wherein the magnets  67 ,  68  are inserted in and coupled to the rotating plate  60  such that their magnetisms correspond to each other, and a circular step  66 , circular portions  61 ,  71 , and the key portion  69  are formed in the central portion, so that the rotating plate  60  is fixedly coupled with the rotating shaft  50  to be able to smoothly rotate without being separated and detached therefrom while a certain space is being kept;  FIG. 11  is a perspective view showing some extracted and enlarged components wherein magnets  87 ,  88 , which form liner-motion-side magnets, are arranged so as to correspond to each other and inserted in the drive membrane  90 , which is fastened and coupled to the drive part  80  and threaded portions  84 ,  85  by screws  17 ,  18 , and an oil-less bushing  92  is inserted in and coupled to a center  81 ; and  FIG. 16  is an extracted and enlarged perspective view of the shape of the housing head  40  in which a lower section is opened and formed as a circular shape, a fixing portion  49  to which a fixing step  91  is to be fixed is formed on the opened circumference surface, a cylindrical shape having openings  41 ,  42  at both ends of an upper section is formed, and a fixing step (not shown) and a regular-interval thread portion are formed therein. 
     The pump according to the present embodiment will be described in more detail with reference to the illustrated drawings, in which as shown in  FIG. 12 , the drive membrane  90  is driven toward the rotating part  70  by suction forces of magnets of the rotating part  70  and the drive part  80 , so that a compression chamber  99  becomes in a vacuum state, and fluid is sucked through the suction port  41 , and as shown in  FIG. 13 , the drive membrane  90  is driven apart from the rotating part  70  by repulsive forces of magnets of the rotating part  70  and the drive part  80 , so that the compression chamber  99  becomes in a compressed state, and the fluid in the compression chamber  99  is delivered from the outlet port  42 . The compression chamber  99  is defined by the housing head  40 , the drive membrane  90 , and the wheel housing  30 , which will be described later. 
     More specifically, with reference to the accompanying drawings, a fixing portion (not shown) of the motor  10  and fixing portions  22 ,  23  of the housing  20  are fastened and fixed by screws (not shown), as shown in  FIG. 2 . 
     As shown in  FIG. 3 , the thrust bearing  52  is inserted and mounted in a bearing holder  21  of the housing  20  so that the rotating shaft  50  can support load in the axial direction, and the motor shaft  11  is inserted in the rotating shaft  50  and coupled therewith by the fixing pin  51  being inserted in the pin hole  12  of the motor  10 , the pin hole  55  of the rotating shaft, and a pin hole  54  of the thrust bearing. As shown in  FIG. 4 , the thrust bearing  53  is inserted in the rotating shaft  50 , the thrust bearing  53  is mounted to a bearing holder  31 , and the housing  20  and the wheel housing  30  are fixed (not shown) and coupled with each other. 
     The key  34  is inserted in the key portion  19  of the rotating shaft  50  as shown in  FIG. 5  and inserted in the key portion  69  of the rotating plate  60  as shown in  FIG. 6 , so that the rotating shaft and the rotating plate are coupled with each other, and the fixing nut  13  is coupled to the threaded portion of the rotating shaft as shown in  FIG. 7 , so that the rotating shaft  50  and the rotating plate  60  are coupled with each other and assembled to be able to smoothly rotate without being separated and detached. 
     Although the rotating shaft of the motor and the rotating plate used in the pump according to the present embodiment are preferably constructed individually and then integrated with each other, the rotating shaft and the rotating plate may be integrally constructed. 
     As shown in  FIG. 8 , in the pump according to the present embodiment, the magnets  67 ,  68  are arranged in magnet grooves  62 ,  63  of the rotating plate  60  such that their magnetisms correspond to each other, and inserted therein to be coupled with the rotating part (not shown). As shown in  FIG. 9 , the fixing step  91  of the drive membrane  90  is coupled and mounted to the fixing portion  39  of the wheel housing  30 . 
     Although it is desirable that the drive membrane of the pump according to the present embodiment is separated from the wheel housing and the drive membrane is mounted to the fixing portion, the drive membrane may be formed integrally with the wheel housing, and may be fixed by an alternatively configured fixing method. 
     As shown in  FIG. 10 , in the pump according to the present embodiment, the magnets  67 ,  68  are inserted in magnet portions  62 ,  63  of the rotating plate  60  and magnet portions  72 ,  73  of the rotating part  70  such that their magnetisms correspond to each other, and the threaded portions  64 ,  65  of the rotating plate and threaded portions  74 ,  75  of the rotating part are fastened by screws  15 ,  16 , and the circular step  66 , the circular portions  61 ,  71 , and the key portion  69  are formed in the central portion, so that the rotating plate is coupled with the rotating shaft  50  and arranged to be able to smoothly rotate within the wheel housing so as to allow reversible rotation without being separated and detached within the wheel housing. 
     As shown in  FIG. 11 , in the pump according to the present embodiment, the magnets  87 ,  88  are arranged in the drive membrane  90  such that their magnetisms correspond to each other, and inserted in magnet portions  82 ,  83  of the drive part  80 , and threaded portions (not shown) of the drive membrane  90  and the threaded portions  84 ,  85  of the drive part are fastened and coupled by the screws  17 ,  18 , the oil-less bushing  92  is inserted in the center  81  such that the fixing nut  13  is inserted therein to allow reversible rotation. Preferably, the magnets  67 ,  68 , constituting the rotating-side magnets, and the magnets  87 ,  88 , constituting the liner-motion-side magnets, are formed in generally cylindrical shape and configured to have S or N poles at both ends of the axial direction as shown in  FIG. 15 . 
     As shown in  FIG. 12 , in the pump according to the present embodiment, when the motor shaft  11  and the rotating shaft  50  of the motor  10  rotate, the rotating plate  60  and the rotating part  70  are rotated, and when the magnets  67  and  68  of the rotating part and the magnets  87 ,  88  of the drive part  80  are positioned on the same line with different polarities respectively, suction force is generated between the magnets  67 ,  68  and the magnets  87 ,  88  so that the drive part  80  and the drive membrane  90  are moved in a direction closer to the rotating part  70 . 
     A vane (not shown) of the drive membrane  90  of the pump according to the present embodiment is made of soft mixed material or elastic material, and configured such that driving is controlled within a certain range, and a constant distance is maintained between the drive part  80  and the rotating part  70  even when the drive membrane  90  comes closest to the rotating part  70 , so that the drive part and the rotating part do not come into contact with each other. 
     At this time, a vacuum is formed in the sealed compression chamber  99  by the drive membrane  90 , and therefore, the fluid is sucked through the suction port into the compression chamber  99  by one check valve  44 , which closes a flow path so that the fluid is sucked through the suction port  41 , and the other check valve  43 , which opens a flow path. 
     As shown in  FIG. 13 , in the pump according to the present embodiment, when the motor shaft  11  and the rotating shaft of the motor  10  are rotated, the rotating plate  60  and the rotating part  70  are rotated, and the magnets  67  and  68  of the rotating part and the magnets  87 ,  88  of the drive part  80  are positioned on the same line with the same polarities respectively, repulsive force is generated between the magnets  67 ,  68  and the magnets  87 ,  88  so that the drive part  80  and the drive membrane  90  are linearly moved within the compression chamber  99  in the direction of the compression chamber. 
     At this time, the sealed compression chamber  99  becomes in a compressed state by the movement of the drive membrane, and therefore, the fluid in the compression chamber is fed out through the outlet port  42  by one check valve  43 , which closes a flow path so that the fluid in the compression chamber is delivered through the outlet port  42 , and the other check valve  44 , which opens a flow path. 
     Accordingly, as shown in  FIG. 12 , when the compression chamber  99  becomes in a vacuum state, the check valve  44  of the outlet port  42  is closed and the check valve  43  of the suction port  41  is opened so that fluid is sucked through the suction port, and as shown in  FIG. 13 , when the compression chamber  99  becomes in a compressed state, the check valve  43  of the suction port  41  is closed and the check valve  44  of the outlet port  42  is opened so that fluid is fed out through the outlet port. 
     Therefore, the pump according to the present embodiment allows continuous suction and delivery of fluid by repeatedly performing the operations of  FIG. 12  and  FIG. 13 . 
     The pump according to the present embodiment is preferably configured so that the thrust bearings  52 ,  53  can support load of axial force as shown in  FIG. 4 , but may be replaced with other types of bearings or deleted. 
     In the pump according to the present embodiment, the shape of the rotating shaft  50  as shown in  FIG. 3  may be changed to a shape not shown, and the rotating shaft  50  may be replaced with a different power transmission device. 
     The pump according to the present embodiment is preferably configured so that the rotating plate  60  and the rotating part  70  are separately constructed and then coupled with each other as shown in  FIG. 10 , but may be integrally constructed. Further, it is preferable that the drive membrane  90  and the drive part  80  are separately constructed and then coupled with each other as shown in  FIG. 11 , but they may be integrally constructed. 
     The pump according to the present embodiment is preferably configured so that the drive membrane  90  is made of soft or elastic material as shown in  FIG. 11 , but may be deformed into a cylinder. In addition, since the outer peripheral surface of the drive part  80  and the inner peripheral surface  33  of the wheel housing  30  are not frictioned, a pump having excellent low noise and excellent durability can be provided, and since the drive part is driven only by displacement of magnets, a high efficiency pump can be provided. It is apparent from the claims that embodiments with such modifications or improvements may also be included in the technical scope of the present invention. 
     REFERENCE SIGNS LIST 
     
         
           10  Motor (Drive source) 
           20  Housing 
           30  Wheel housing 
           40  Housing head 
           41  Suction port 
           42  Outlet port 
           50  Rotating shaft 
           60  Rotating plate 
           67 ,  68  Magnet (Rotating-side magnets) 
           70  Rotating part 
           80  Drive part 
           87 ,  88  Magnet (Liner-motion-side magnets) 
           90  Drive membrane 
           99  Compression chamber