Pump casing and magnet pump including the same

Abstract

A pump casing defines an inner space including an inlet into which a fluid is introduced, a flow path through which the fluid is introduced from the inlet and discharged to the outside, and an arrangement space in which an impeller rotated about a predetermined central axis is disposed so as to guide flow of the fluid. The pump casing includes a suction casing which forms the inlet, a volute casing which forms the flow path, and the introduced fluid is discharged to the outside by the impeller. The volute casing forms the arrangement space in which the impeller is disposed, and the pump casing further includes a fluid guide device which is disposed in the inner space to guide movement of the fluid which is moved from the inlet toward the arrangement space.

1 . A pump casing, which forms an inner space including an inlet space into which a fluid is introduced, a flow path through which the fluid is introduced from the inlet space and the introduced fluid is discharged to the outside, and an arrangement space in which an impeller rotated about a predetermined central axis is disposed so as to guide a flow of the fluid, the pump casing comprising:
 a suction casing which forms the inlet space into which the fluid is introduced; and   a volute casing which forms the flow path through which the fluid is introduced from the inlet space and the introduced fluid is discharged to the outside by the impeller,   wherein the volute casing forms the arrangement space in which the impeller is disposed, and   the pump casing further includes a fluid guide device which is disposed in the inner space to guide movement of the fluid which is moved from the inlet space toward the arrangement space.   
     
     
         2 . The pump casing of  claim 1 , wherein the fluid guide device includes:
 a guide main body which forms a moving space in which the fluid is moved from the inlet space to the arrangement space;   a guide extending portion which extends inward from the guide main body to reduce a vortex of the fluid being moved; and   a guide contact unit in contact with the impeller rotated by an external force in the arrangement space,   wherein the guide contact unit has a friction coefficient smaller than that of the guide main body and an elastic modulus greater than that of the guide main body.   
     
     
         3 . The pump casing of  claim 2 , wherein:
 the guide main body surrounds at least a portion of the guide contact unit;   the guide contact unit includes a contact main body having a contact surface in contact with the impeller; and   the contact surface is disposed to protrude more than the guide main body in a direction of the impeller.   
     
     
         4 . The pump casing of  claim 3 , wherein:
 the guide contact unit further includes a contact protrusion which protrudes radially from the contact main body with respect to the predetermined central axis; and   the guide main body surrounds the contact protrusion.   
     
     
         5 . The pump casing of  claim 3 , further comprising a guide support unit which extends from the guide extending portion and forms an accommodating space for accommodating a front end portion of a support shaft supporting the impeller,
 wherein the guide extending portion surrounds at least a portion of the contact main body.   
     
     
         6 . The pump casing of  claim 3 , wherein the contact main body includes a contact recessed portion which is recessed from the contact surface to form a recessed space. 
     
     
         7 . The pump casing of  claim 6 , wherein a maximum recessed depth from the contact surface to the contact recessed portion is smaller than a protruding height from the guide main body to the contact surface. 
     
     
         8 . The pump casing of  claim 3 , wherein:
 the guide main body forms a first insertion groove into which a fixing member for fixing the pump casing and the guide main body is inserted so as not to be rotated about the predetermined central axis on the pump casing; and   the contact main body forms a second insertion groove into which the fixing member inserted into the first insertion groove is inserted so as not to be rotated about the predetermined central axis on the guide main body.   
     
     
         9 . The pump casing of  claim 1 , wherein:
 the suction casing is detachable from the volute casing by a predetermined detachable member;   the suction casing includes a suction main body forming the inlet space and a first fastening unit to which the detachable member is fastened;   the volute casing includes a volute main body forming the arrangement space and a second fastening unit to which the detachable member is fastened;   the suction casing includes a first facing surface facing the volute casing when the suction casing is connected to the volute casing by the detachable member; and   the volute casing includes a second facing surface facing the first facing surface when the volute casing is connected to the suction casing by the detachable member.   
     
     
         10 . The pump casing of  claim 9 , further comprising a gap maintaining unit disposed between the first facing surface and the second facing surface so as to prevent the fluid from leaking between the first facing surface and the second facing surface,
 wherein the gap maintaining unit is made of an elastic material.   
     
     
         11 . The pump casing of  claim 10 , wherein, when the suction casing and the volute casing are connected by the detachable member, the gap maintaining unit forms a separation space between the first fastening unit and the second fastening unit so that the first fastening unit and the second fastening unit are not in contact with each other. 
     
     
         12 . The pump casing of  claim 11 , wherein the gap maintaining unit includes:
 a first gap maintaining unit connected to the suction casing; and   a second gap maintaining unit connected to the volute casing,   wherein the first gap maintaining unit presses the fluid guide device in an axial direction so that the fluid guide device does not shake in the inner space, and   the second gap maintaining unit presses the fluid guide device in a direction orthogonal to the axial direction so that the fluid guide device does not shake in the inner space.   
     
     
         13 . The pump casing of  claim 12 , wherein:
 the first gap maintaining unit includes a first separation contact unit in contact with the second gap maintaining unit, a first support contact unit in contact with a support unit which forms an accommodating space for accommodating a front end portion of a support shaft supporting the impeller, and a first extending portion which extends from the first support contact unit to the inlet space and is not in contact with the support unit; and   the second gap maintaining unit includes a second separation contact unit in contact with the first gap maintaining unit, a second support contact unit in contact with the support unit, and a second extending portion which extends from the second support contact unit to the arrangement space and is not in contact with the support unit.   
     
     
         14 . The pump casing of  claim 9 , wherein the first facing surface presses the fluid guide device so that the fluid guide device does not shake in the inner space. 
     
     
         15 . A magnet pump comprising:
 the pump casing according to  claim 1 ;   an outer magnet rotated by a motor;   an inner magnet rotated by the outer magnet; and   an impeller rotated by the inner magnet.