Cascade pump device

Abstract

A cascade pump device may include a pump chamber, an impeller, a magnetic drive mechanism structured to rotate the impeller, and a pump case. The pump case is provided with two end faces located at both ends in an axial line direction and an intermediate part between the two end faces. The intermediate part is provided with a suction pipe and a discharge pipe and a wiring outlet part for taking out wiring lines for supplying an exciting current to a drive coil of a motor. The suction pipe and the discharge pipe are protruded in the same direction and the wiring outlet part is provided with a wiring line drawing-out guide part which determines a drawing-out direction of the wiring lines to the outer side. An angle between the drawing-out direction and a protruding direction of the suction pipe and the discharge pipe is less than 90° around the axial line.

1 . A cascade pump device comprising:
 a pump chamber which is formed in a circular ring shape;   an impeller which is formed in a circular ring shape and is coaxially disposed within the pump chamber;   a magnetic drive mechanism which is structured to rotate the impeller by exciting a drive coil; and   a pump case which accommodates the pump chamber, the impeller and the magnetic drive mechanism;   wherein the pump case is provided with two end faces which are located at both ends in an axial line direction and an intermediate part between the two end faces;   wherein the intermediate part is provided with a suction pipe and a discharge pipe which are in communication with the pump chamber and a wiring outlet part for taking out wiring lines for supplying an exciting current to the drive coil to an outer side;   wherein the suction pipe and the discharge pipe are protruded in a same direction which is parallel to each other along a plane perpendicular to the axial line direction;   wherein the wiring outlet part is provided with a wiring line drawing-out guide part which determines a drawing-out direction of the wiring lines to the outer side; and   wherein an angle between the drawing-out direction and a protruding direction of the suction pipe and the discharge pipe is less than 90° around the axial line.   
     
     
         2 . The cascade pump device according to  claim 1 , wherein the suction pipe, the discharge pipe and the wiring outlet part are provided around the axial line direction in an order of the suction pipe, the discharge pipe and the wiring outlet part, or in an order of the discharge pipe, the suction pipe and the wiring outlet part. 
     
     
         3 . The cascade pump device according to  claim 1 , wherein
 the intermediate part is provided with an outer peripheral face structuring a contour of the pump case when viewed in the axial line direction, and   the wiring outlet part is provided on an inner side with respect to the outer peripheral face structuring the contour.   
     
     
         4 . The cascade pump device according to  claim 1 , wherein
 the intermediate part is provided with a first side face and a second side face, which are adjacent to each other around the axial line direct and structure a part of a contour of the pump case when viewed in the axial line direction, and a first projecting corner which is formed between the first side face and the second side face,   the magnetic drive mechanism is structured on an inner side in a radial direction with respect to the pump chamber,   the suction pipe and the discharge pipe are protruded from the first side face, and   the wiring outlet part is provided on an inner side with respect to the first projecting corner.   
     
     
         5 . The cascade pump device according to  claim 4 , further comprising an inclined face extending in the axial line direction and intersecting with the first side face and the second side face,
 wherein the inclined face is formed at the first projecting corner by cutting out a tip end of the first projecting corner.   
     
     
         6 . The cascade pump device according to  claim 5 , wherein
 the intermediate part is provided with a wiring line direction restricting part which restricts a direction of the wiring line drawn out along the inclined face after the wiring line is taken out from the wiring outlet part to an outer side of the pump case, and   the wiring line direction restricting part is located on an inner side of a contour of a projecting corner structured by extending and intersecting the first side face and the second side face each other.   
     
     
         7 . The cascade pump device according to  claim 6 , wherein the wiring line direction restricting part is extended in a direction perpendicular to the axial line direction along the inclined face at a midway position in the axial line direction of the inclined face. 
     
     
         8 . The cascade pump device according to  claim 4 , wherein the pump case is formed in a rectangular prism shape. 
     
     
         9 . The cascade pump device according to  claim 8 , wherein
 the first projecting corner is formed with an inclined face which intersects the first side face and the second side face and is extended in the axial line direction by cutting out a tip end of the first projecting corner,   the intermediate part is provided with a wiring line direction restricting part which restricts a direction of the wiring line drawn out along the inclined face after the wiring line is taken out from the wiring outlet part to an outer side of the pump case, and   the wiring line direction restricting part is a hook having a space for locking the wiring line between the inclined face and the hook and is located on an inner side of a contour of a projecting corner which is formed by extending and intersecting the first side face and the second side face each other.   
     
     
         10 . The cascade pump device according to  claim 8 , further comprising attaching holes for attaching the pump case to an external apparatus,
 wherein one of the attaching holes is formed on an inner side of a second projecting corner between the first side face and a third side face adjacent to the first side face on an opposite side to the second side face around the axial line direction in the pump case, and   wherein another of the attaching holes is formed on an inner side of a third projecting corner located at a diagonal position to the second projecting corner.   
     
     
         11 . The cascade pump device according to  claim 10 , wherein
 the pump case includes a first case and a second case,   the pump chamber is partitioned by superposing the first case and the second case on each other in a partially overlapped state in a direction perpendicular to the axial line direction,   the pump case is provided with a first fixing part for fixing the first case and the second case to each other with a screw, and   the first fixing part is protruded from the first side face between the suction pipe and the discharge pipe.   
     
     
         12 . The cascade pump device according to  claim 10 , further comprising a second fixing part and a third fixing part which are provided in the pump case for fixing the first case and the second case to each other with a screw,
 wherein the second fixing part is formed on an inner side of the third projecting corner and the third fixing part is formed on an inner side of the fourth projecting corner located at a diagonal position to the first projecting corner.   
     
     
         13 . The cascade pump device according to  claim 10 , wherein
 the pump case includes a first case and a second case,   the pump chamber is partitioned by superposing the first case and the second case on each other in a partially overlapped state in a direction perpendicular to the axial line direction,   an O-ring is coaxially disposed with the pump chamber between the first case and the second case for preventing leakage of fluid from the pump chamber, and   a turning prevention mechanism is structured on an inner side of a fourth projecting corner located at a diagonal position to the first projecting corner in the pump case for preventing the first case and the second case from relatively turning to each other around the axial line direction when the first case and the second case are to be superposed on each other to partition the pump chamber.   
     
     
         14 . A pump case configured to accommodate a pump chamber, an impeller, and a magnetic drive mechanism, the pump case comprising:
 two end faces, each of which are located at ends of the pump case in an axial line direction; and   an intermediate part between the two end faces;   wherein the intermediate part is provided with a suction pipe and a discharge pipe which are in communication with the pump chamber, and a wiring outlet part for taking out wiring lines for supplying a current to the magnetic drive mechanism to an outer side;   wherein the suction pipe and the discharge pipe are protruded in a same direction which is parallel to each other along a plane perpendicular to the axial line direction;   wherein the wiring outlet part is provided with a wiring line drawing-out guide part which determines a drawing-out direction of the wiring lines to the outer side; and   wherein an angle between the drawing-out direction and a protruding direction of the suction pipe and the discharge pipe is less than 90° around the axial line.