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CN-224214389-U - Permanent magnet downdraft submersible electric pump

CN224214389UCN 224214389 UCN224214389 UCN 224214389UCN-224214389-U

Abstract

The utility model provides a permanent magnet downdraft submersible pump, and relates to the technical field of submersible pumps. The permanent magnet motor is arranged in the pump body, an upper flange and a lower flange are respectively formed at the upper end and the lower end of the pump body, a water outlet interface is arranged at the upper end of the pump body and connected with the upper flange, a thrust bearing chamber is arranged at the lower end of the pump body and connected with the lower flange, a volute is connected to the bottom of the thrust bearing chamber, a bottom cover is arranged at the bottom of the volute, a water inlet bell mouth is formed in the center of the bottom cover, an impeller is arranged on a rotor shaft of the permanent magnet motor, the impeller is arranged in the volute, and the bottom of the permanent magnet motor is fixedly connected with the thrust bearing chamber through bolts. The permanent magnet motor is arranged in the flow passage of water flow, so that the whole length of the permanent magnet down-draft submersible electric pump is shortened, the volume is reduced, the operation in a narrow space is facilitated, the surface of the permanent magnet motor is flushed by the high-speed water flow pressurized by the impeller, heat is taken away, and the heat dissipation of the permanent magnet motor is realized.

Inventors

  • ZHONG LINTAO
  • LIAO GONGLEI
  • LIN HUA
  • LI CONG
  • Liu Xueken
  • YU BO
  • HE JING

Assignees

  • 四川省机械研究设计院(集团)有限公司
  • 四川省川嘉泵业有限公司

Dates

Publication Date
20260508
Application Date
20250725
Priority Date
20250722

Claims (9)

  1. 1. A permanent magnet downdraft submersible electric pump (1), characterized by comprising: The pump body (17) is provided with an upper flange (172) and a lower flange (171) at the upper end and the lower end respectively; A water outlet joint (19) arranged at the upper end of the pump body (17) and connected at the upper flange (172); A thrust bearing chamber (14) provided at the lower end of the pump body (17) and connected at the lower flange (171); The volute (11) is connected to the lower end of the thrust bearing chamber (14); The bottom cover (10) is connected to the lower end of the volute (11), and a water inlet bell mouth (101) is formed in the center of the bottom cover; The permanent magnet motor (18) is arranged in the pump body (17); An impeller (12) sleeved on a rotor shaft (1811) of the permanent magnet motor (18); The impeller (12) is arranged inside the volute (11), and the permanent magnet motor (18) is arranged at the upper end of the thrust bearing chamber (14).
  2. 2. The permanent magnet down-draught electric submersible pump (1) according to claim 1, characterized in that the permanent magnet motor (18) comprises: A housing assembly (182); A rotor assembly (181) mounted inside the housing assembly (182).
  3. 3. The permanent magnet down-draft submersible electric pump (1) according to claim 2, wherein the housing assembly (182) comprises: a housing 1822 having a stator and a motor winding 1824 disposed therein; An upper guide bearing seat (1823) fixedly connected to the top of the housing (1822); a lower guide bearing seat (1821) fixedly connected to the bottom of the housing (1822); An upper end cap (1825) mounted on top of the upper guide bearing housing (1823); Wherein, one end of the upper bearing seat (1823) and the lower bearing seat (1821) is internally provided with a guide part (18231), and the center of the guide part (18231) is provided with a through hole.
  4. 4. The permanent magnet down-draught electric submersible pump (1) according to claim 2, characterized in that the rotor assembly (181) comprises: A rotor shaft (1811) consisting of a rotor shaft body (18111) and a plurality of shaft sections of different diameters; Permanent magnets (1814) of which two are formed into a permanent magnet group and which are uniformly installed in the circumferential direction of the rotor shaft main body (18111); a spacer block (1815) mounted between two of said permanent magnet sets forming a permanent magnet ring set nested on said rotor shaft body (18111); Wherein, rotor shaft main part (18111) is gone up to overlap and is equipped with two permanent magnet ring group, two permanent magnet ring group circumference offset angle is 7.5.
  5. 5. The permanent magnet down-draught electric submersible pump (1) of claim 4, wherein the rotor assembly (181) further comprises: A sheath (1817) sleeved on the outer side of the permanent magnet (1814); End rings (1813) which are arranged at two ends of the sheath (1817), countersunk holes in annular arrays are machined on the surfaces of the end rings, and corresponding threaded holes are machined at two ends of the rotor shaft main body (18111); The end rings (1813) are fixed at two side ends of the rotor shaft main body (18111) through bolts, the end rings (1813) fix the sheath (1817) on the rotor shaft main body (18111), and the outer surface of the sheath (1817) is flush with the outer surface of the end rings (1813).
  6. 6. The permanent magnet down-draught electric submersible pump (1) of claim 5, wherein the rotor assembly (181) further comprises: sleeve I (1812) and sleeve II (1816); the shaft sleeve I (1812) is sleeved on the shaft section II (18113) of the rotor shaft (1811); The shaft sleeve II (1816) is sleeved on the shaft section IV (18115) of the rotor shaft (1811).
  7. 7. The permanent magnet down-draught submersible electric pump (1) according to claim 6, characterized in that: The outer side of the shaft sleeve I (1812) is also sleeved with a bearing; The bearing is mounted in a through hole of the guide part (18231).
  8. 8. The permanent magnet down-draught submersible electric pump (1) according to claim 1, characterized in that: sealing rings (13) are respectively arranged between the impeller (12) and the bottom cover (10) and between the impeller and the volute (11).
  9. 9. The permanent magnet down-draught submersible electric pump (1) according to claim 8, characterized in that: A mechanical seal (15) is arranged between the impeller (12) and the thrust bearing chamber (14), and the mechanical seal (15) is sleeved on the rotor shaft (1811).

Description

Permanent magnet downdraft submersible electric pump Technical Field The utility model relates to the technical field of submersible pumps, in particular to a permanent magnet downdraft submersible pump. Background The submersible pump is used as important equipment for deep well water intake, and is widely applied to the fields of domestic water, mine rescue, farmland irrigation, industrial cooling, seawater lifting and the like. At present, a three-phase asynchronous motor is still widely used in the submersible pump, so that the volume of the submersible pump is increased, and the energy consumption is increased. With the improvement of the performance of the permanent magnet and the great reduction of the price, the permanent magnet motor is gradually applied to the submersible pump. However, the permanent magnet motor has high power density and large heat productivity, and if the traditional mode of convection by natural water flow is still used for heat dissipation, the permanent magnet material of the permanent magnet motor is demagnetized at high temperature, so that the torque coefficient of the motor is reduced. Disclosure of utility model The utility model provides a permanent magnet downdraft submersible pump, which aims to solve the problems of high-temperature demagnetization of a permanent magnet material and reduction of a motor torque coefficient caused by poor heat dissipation effect of a permanent magnet motor of a permanent magnet submersible pump in the prior art. The technical scheme adopted by the utility model is as follows: a permanent magnet downdraft submersible electric pump comprising: The upper end part and the lower end part of the pump body are respectively provided with an upper flange and a lower flange; the water outlet joint is arranged at the upper end of the pump body and is connected with the upper flange; a thrust bearing chamber disposed at a lower end of the pump body and connected at the lower flange; The volute is connected to the lower end of the thrust bearing chamber; the bottom cover is connected to the lower end of the volute, and a water inlet bell mouth is formed in the center of the bottom cover; the permanent magnet motor is arranged in the pump body; The impeller is sleeved on a rotor shaft of the permanent magnet motor; the impeller is arranged in the volute, and the permanent magnet motor is arranged at the upper end of the thrust bearing chamber. Further, the permanent magnet motor includes: A housing assembly; and the rotor assembly is arranged inside the shell assembly. Further, the housing assembly includes: A housing having a stator and a motor winding disposed therein; the upper guide bearing seat is fixedly connected to the top of the shell; the lower guide bearing seat is fixedly connected to the bottom of the shell; the upper end cover is arranged at the top of the upper guide bearing seat; The guide part is formed inwards at one end of the upper guide bearing seat and one end of the lower guide bearing seat, and a through hole is formed in the center of the guide part. Further, the rotor assembly includes: the rotor shaft consists of a rotor shaft main body and a plurality of shaft sections with different diameters; the two permanent magnets form a permanent magnet group and are uniformly arranged on the circumferential direction of the rotor shaft main body; The isolation block is arranged between the two permanent magnet groups to form a permanent magnet ring group which is sleeved on the rotor shaft main body; The rotor shaft main body is sleeved with two permanent magnet ring groups, and the circumferential offset angle of the two permanent magnet ring groups is 7.5 degrees. Further, the rotor assembly further comprises: the sheath is sleeved on the outer side of the permanent magnet; End rings are arranged at two ends of the sheath, countersunk holes in annular arrays are machined on the surfaces of the end rings, and corresponding threaded holes are machined at two ends of the rotor shaft main body; The end rings are fixed at the two side ends of the rotor shaft main body through bolts, the end rings fix the sheath on the rotor shaft main body, and the outer surface of the sheath is flush with the outer surface of the end rings. Further, the rotor assembly further comprises: Shaft sleeve I and shaft sleeve II; the shaft sleeve I is sleeved on the shaft section II of the rotor shaft; The shaft sleeve II is sleeved on the shaft section IV of the rotor shaft. Further, a bearing is sleeved on the outer side of the shaft sleeve I; The bearing is installed in the through hole of the guide part. Further, sealing rings are respectively arranged between the impeller and the bottom cover and between the impeller and the volute. Further, a mechanical seal is arranged between the impeller and the thrust bearing chamber, and the mechanical seal is arranged on the rotor shaft in a sealing manner. The beneficial effects of the utility model are as fol