US 12,352,271 B2
Vertical multi-stage submersible pump
Jubeak Lee, Incheon (KR); and Daehoon Kang, Siheung-si (KR)
Assigned to DAIJIN PRECISION CO., LTD., Siheung-si (KR)
Filed by DAIJIN PRECISION CO., LTD., Siheung-si (KR)
Filed on Oct. 15, 2023, as Appl. No. 18/487,113.
Claims priority of application No. 10-2022-0102576 (KR), filed on Aug. 17, 2022.
Prior Publication US 2025/0122880 A1, Apr. 17, 2025
Int. Cl. F04D 13/08 (2006.01); F04D 29/40 (2006.01); F04D 29/70 (2006.01)
CPC F04D 13/08 (2013.01) [F04D 29/406 (2013.01); F04D 29/708 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A vertical multi-stage submersible pump comprising:
a motor part (110) including a stator (112) and a rotor (113) installed in a motor casing (111), the motor part (110) having a rotary shaft (114) connected to the rotor (113), configured to rotate, and protruding upward from the motor casing (111);
a water chamber casing (120) assembled to an upper portion of the motor casing (111) and including an oil seal (121) and a mechanical seal (122) configured to define a sealing structure around the rotary shaft (114);
a suction casing (130) assembled to an upper portion of the water chamber casing (120) and having a suction port (131) formed in a circumference of the suction casing (130) so that a fluid is introduced into the suction port (131), the suction casing (130) having a discharge port (132) formed in a central portion of an upper surface of the suction casing (130); and
a pump part (140) configured such that a plurality of impellers (142) is spaced apart from one another in a vertical direction in a pump casing (141) assembled to an upper portion of the suction casing (130), having an inlet port (143) formed in a central portion of a bottom surface of the pump casing (141) and connected to the discharge port (132) of the suction casing (130), and having a discharge port (144) formed in an upper surface of the pump casing (141), and the plurality of impellers (142) is connected to the rotary shaft (114) and pumps the fluid in a stepwise manner while rotating together with the rotary shaft (114),
wherein an upper end of the water chamber casing (120) has a conical structure and defines a conical suction flow path (W1) having a cross-section inclined upward toward the rotary shaft (114) collectively with the suction casing (130), and
wherein a plurality of guide vanes (135) is positioned in the suction flow path (W1) and provided in the suction casing (130) or the water chamber casing (120) to prevent the occurrence of vortices of the introduced fluid.