US20050069434A1 - Submerged pump having a bearing lubricated by discharged fluid - Google Patents

Submerged pump having a bearing lubricated by discharged fluid Download PDF

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Publication number
US20050069434A1
US20050069434A1 US10/954,120 US95412004A US2005069434A1 US 20050069434 A1 US20050069434 A1 US 20050069434A1 US 95412004 A US95412004 A US 95412004A US 2005069434 A1 US2005069434 A1 US 2005069434A1
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US
United States
Prior art keywords
pump
bearing
shaft
target fluid
duct
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/954,120
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English (en)
Inventor
Norifumi Tani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikkiso Co Ltd
Original Assignee
Nikkiso Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nikkiso Co Ltd filed Critical Nikkiso Co Ltd
Assigned to NIKKISO CO. LTD. reassignment NIKKISO CO. LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TANI, NORIFUMI
Publication of US20050069434A1 publication Critical patent/US20050069434A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/049—Roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/06—Lubrication
    • F04D29/061—Lubrication especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine

Definitions

  • the present invention relates to a submersible pump integrally configured by a pump and a motor to drive the pump, and submerged in a reserved target fluid, for use in pumping up the target fluid.
  • a submersible pump in which a pump, such as a centrifugal pump, and a motor for driving the pump are integrated into one unit.
  • a pump such as a centrifugal pump
  • a motor for driving the pump are integrated into one unit.
  • Such a submersible pump is used in a state that it is entirely immersed in the target fluid to be pumped by the pump.
  • the submersible pump is configured so as to allow entry of the target fluid into regions around a stator and a rotor of the motor and around bearings for shafts of the motor and the pump in order to utilize the target fluid for cooling, lubrication, or the like.
  • a target fluid discharged by a pump is conveyed to a bearing located at an upper end of a shaft to lubricate the bearing.
  • a pump is described in Japanese Utility Model Application No. Hei 5-26949 (Japanese Utility Model Laid-Open Publication No. Hei 6-80896).
  • This invention provides a submersible pump in which a bearing is advantageously protected against insufficient lubrication.
  • a submersible pump according to the present invention comprises a lead-in duct through which a target fluid discharged from a pump is partially directed to flow through a bearing supporting a shaft of a motor almost at an upper end of the shaft and then conveyed into a housing in which the motor is installed, and a throttle structure installed downstream from the bearing in the lead-in duct.
  • an entrance of a reflux channel for returning, to a pump unit, the target fluid existing in the housing in which the motor is installed is disposed at a place situated higher than the bearing located near the upper end of the motor shaft.
  • FIG. 1 schematically shows a configuration of a submersible pump according to an embodiment
  • FIG. 2 shows a detail of the structure near an upper end of a motor shaft in the submersible pump
  • FIG. 3 shows another detailed structure near the upper end of the motor shaft in the submersible pump.
  • FIG. 1 schematically shows a configuration of a submersible pump 10 according to this embodiment.
  • the submersible pump 10 has a structure in which a pump unit 12 including a pump for boosting a pressure of a target fluid to be pumped up and a motor unit 14 for driving the pump are contained in a pot 16 .
  • An opening at the top of the pot 16 is covered by a head plate 18 .
  • the target fluid is introduced from an intake pipe 20 into the pot 16 , while gases are removed through a degassing pipe 22 to enable the pot 16 to fill with the target fluid.
  • the submersible pump 10 should be placed in the same vertical position as illustrated in FIG. 1 in actual use. In other words, the submersible pump 10 is placed so that the pump unit 12 will be located below the motor unit 14 .
  • the pump unit 12 includes a multistage centrifugal pump in which a plurality of centrifugal pumps 26 are arranged on a common pump shaft 24 .
  • a lower part of the multistage centrifugal pump, more specifically, a suction port of the centrifugal pump 26 on the first stage is attached to a suction pipe 28 which includes, in the inside thereof, a inducer 30 mounted to the pump shaft 24 and actuated with the pump shaft 24 .
  • the motor unit 14 located above the pump unit 12 includes an electric motor 32 for driving the multiphase centrifugal pump and a housing cylinder 34 placed so as to enclose the motor 32 .
  • the motor 32 comprises a motor shaft 36 shared as the pump shaft 24 , a rotor 38 fixed to the motor shaft 36 , and a stator 40 fixed on the housing cylinder 34 .
  • the bottom of the housing cylinder 34 is joined to an attachment plate 42 , and the pump unit 12 is also joined to the attachment plate 42 to be integral with the motor unit 14 .
  • the top of the housing cylinder 34 is connected to a discharge manifold 44 .
  • the housing cylinder 34 , the attachment plate 42 , and the discharge manifold 44 constitute a housing in which the motor 32 is installed.
  • the target fluid is pressurized in the pump unit 12 .
  • the attachment plate 42 holds a bottom bearing 46 which is a rolling bearing rotatably supporting the motor shaft 36 , and includes a bottom seal 48 for suppressing the flow of pressurized target fluid into the motor unit 14 . Because a small gap is present between bottom seal 48 and the pump shaft 24 , a small amount of the target fluid enters a housing chamber 49 , which is a space formed in the housing of the pump unit 12 . This small amount of target fluid flows through the bottom bearing 46 while lubricating the bottom bearing 46 .
  • the discharge manifold 44 holds a top bearing 50 rotatably supporting the motor shaft 36 in the proximity of an upper end of the motor shaft 36 .
  • a discharge port 54 communicating with a discharge hole 52 formed in the head plate 18 .
  • the target fluid delivered from the multistage centrifugal pump is conveyed to the discharge port 54 through a discharge channel 56 running around components, such as, for example, the stator 40 of the motor unit 14 , and then pumped to the outside.
  • the discharge manifold 44 comprises a lead-in duct 58 for diverting the target fluid from the discharge port 54 into the housing chamber 49 .
  • the top bearing 50 is installed in the lead-in duct 58 , and a top seal 60 is installed downstream from the top bearing 50 .
  • An entrance 62 a to a reflux channel 62 for returning the target fluid contained in the housing chamber 49 to the pump unit 12 is provided in the housing chamber 49 , at a location higher than the top bearing 50 , preferably at a topmost part of the housing chamber 49 . Through the reflux channel 62 , gases accumulated in the housing chamber 49 is collected and conveyed to the pump unit 12 together with the target fluid.
  • FIG. 2 shows a detailed configuration of the lead-in duct 58 .
  • the lead-in duct 58 directs the target fluid from the discharge port 54 to the top bearing 50 which is a rolling bearing, preferably a ball bearing.
  • the target fluid flows downstream and passes through gaps between an inner race and a rolling element of the top bearing 50 and between an outer race, an inner race and the rolling element.
  • the target fluid passing through the top bearing 50 functions as a lubricant for the top bearing 50 .
  • the target fluid flowing past the top bearing 50 reaches the top seal 60 which includes a small clearance 64 between the seal and the outside of the motor shaft 36 .
  • the top seal 60 constitutes a throttle structure in which a flow path in the lead-in duct 58 is narrowed, wherein flow resistance in the lead-in duct 58 increases.
  • This throttle structure causes a pressure differential to develop across the clearance 64 , with the result that the area around the top bearing 50 is maintained at a pressure close to the pressure raised by the multistage centrifugal pump, while the inside of the housing chamber 49 is maintained at a relatively lower pressure.
  • a flow rate of the target fluid passing through the lead-in duct 58 is restricted by the throttle structure, which suppresses any decrease in discharge from the submersible pump 10 , in other words, any decrease in flow rate of the target fluid to be pumped.
  • each component of the throttle structure such as, for example, clearance and length, should be set a dimension that will ensure the capability of maintaining a pressure which can prevent, or significantly suppress, vaporization of the target fluid in the area around the bearing.
  • the shape of the flow path in the throttle structure may be, for example, crank-shaped rather than straight.
  • labyrinth structure 66 as shown in FIG. 3 may be formed in the seal 60 so as to alternately dispose narrow and broad gaps.
  • the submersible pump 10 may be preferably used as a pump for handling LNG which contains carbon monoxide.
  • LNG contains carbon monoxide
  • a gas carbon monoxide
  • the submersible pump 10 may be preferably used as a pump for handling LNG which contains carbon monoxide.
  • LNG contains carbon monoxide
  • a gas carbon monoxide appears at a lower temperature because the boiling point of carbon monoxide is lower than those of other constituents in the LNG, and lower than the boiling point of another LNG which contains no carbon monoxide.
  • the throttle structure downstream from the top bearing 50 poor lubrication due to the occurrence of gas in the vicinity of the top bearing 50 can be prevented.
  • the number of stages is not so limited, and may be changed as appropriate according to design requirements.
  • bearings other than the ball bearing may be used as the top and bottom bearings, and may be selected in consideration of other design requirements.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US10/954,120 2003-09-29 2004-09-29 Submerged pump having a bearing lubricated by discharged fluid Abandoned US20050069434A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003338540A JP4300088B2 (ja) 2003-09-29 2003-09-29 サブマージドポンプ
JP2003-338540 2003-09-29

Publications (1)

Publication Number Publication Date
US20050069434A1 true US20050069434A1 (en) 2005-03-31

Family

ID=34191594

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/954,120 Abandoned US20050069434A1 (en) 2003-09-29 2004-09-29 Submerged pump having a bearing lubricated by discharged fluid

Country Status (3)

Country Link
US (1) US20050069434A1 (enrdf_load_stackoverflow)
EP (1) EP1519053A3 (enrdf_load_stackoverflow)
JP (1) JP4300088B2 (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080080988A1 (en) * 2006-09-28 2008-04-03 Snecma Pump with electric motor, immersed in the fluid to be pumped
US20080267763A1 (en) * 2007-04-30 2008-10-30 Snecma Rotary machine including a passive axial balancing system
US20080302097A1 (en) * 2005-04-01 2008-12-11 Gunter Andres Hydraulic Unit
US20110064592A1 (en) * 2008-04-10 2011-03-17 Axel Jaeschke Underwater Delivery Unit
US20120224985A1 (en) * 2011-03-02 2012-09-06 Baker Hughes Incorporated Electric submersible pump floating ring bearing and method to assemble same
CN102996469A (zh) * 2012-12-24 2013-03-27 成都安迪生测量有限公司 一种多头螺旋密封的低温潜液泵
US20130189133A1 (en) * 2012-01-19 2013-07-25 Danfoss (Tianjin) Ltd. Compressor and method of assembling compressor
US20130195618A1 (en) * 2009-10-13 2013-08-01 MAN Diesel &Turbo SE Underwater Compressor Arrangement And Underwater Process Fluid Conveying Arrangement Equipped Therewith
CN103573651A (zh) * 2013-11-08 2014-02-12 成都安迪生测量有限公司 一种lng潜液泵
CN103618414A (zh) * 2013-12-26 2014-03-05 大连深蓝泵业有限公司 一种新型低温潜液电机
CN105298824A (zh) * 2014-06-27 2016-02-03 安瑞科(廊坊)能源装备集成有限公司 一种lng潜液泵系统
WO2020127977A1 (en) 2018-12-20 2020-06-25 Fsubsea As Subsea pump system with process lubricated bearings
US11274679B2 (en) * 2017-02-14 2022-03-15 Danfoss A/S Oil free centrifugal compressor for use in low capacity applications

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2435988C1 (ru) * 2010-06-23 2011-12-10 Закрытое Акционерное Общество "Научно-производственное объединение "Гидравлические аппараты" Насос
CN102062107B (zh) * 2010-12-13 2012-08-29 甘肃银光聚银化工有限公司 一种长轴多级轴向流液下泵和输送光气方法
CN103629144A (zh) * 2013-12-26 2014-03-12 大连深蓝泵业有限公司 立式液下泵轴承保护装置
JP6339422B2 (ja) * 2014-06-10 2018-06-06 エア・ウォーター株式会社 流体用ポンプ
CN105756957A (zh) * 2016-04-18 2016-07-13 大连深蓝泵业有限公司 海洋工况用电动超低温潜液泵的轴系支撑结构
KR20230107360A (ko) * 2020-11-27 2023-07-14 가부시키가이샤 에바라 세이사꾸쇼 유로 전환 장치 및 잠몰식 펌프의 공전을 방지하기 위한 방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4545741A (en) * 1982-05-07 1985-10-08 Hitachi, Ltd. Vertical motor pump
US4957417A (en) * 1989-07-14 1990-09-18 Kabushiki Kaisha Kobe Seiko Sho Vertical oilless screw vacuum pump
US4990068A (en) * 1987-03-23 1991-02-05 Zhong Xing X Unique grease lubricated ball bearing canned motor pump

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1486842A (en) * 1920-10-30 1924-03-11 Midwest Engine Corp Lubricating system for deep-well pumps
US1953447A (en) * 1930-08-23 1934-04-03 A D Cook Inc Water lubrication system for deep well turbine pumps
DE1800254B2 (de) * 1968-01-24 1971-09-30 Vorrichtung zur sicherstellung der kuehlung der wellen abdichtungen und mediumgeschmierten radiallager von unter hohen systemdruecken arbeitenden umwaelzpumpen
FR2484575A1 (fr) * 1980-06-17 1981-12-18 Jeumont Schneider Palier hydrostatique a securite de fonctionnement
JP4842456B2 (ja) * 2001-06-14 2011-12-21 日機装株式会社 ウエットモータポンプ
JP2003201983A (ja) * 2002-01-09 2003-07-18 Nikkiso Co Ltd 多段遠心ポンプ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4545741A (en) * 1982-05-07 1985-10-08 Hitachi, Ltd. Vertical motor pump
US4990068A (en) * 1987-03-23 1991-02-05 Zhong Xing X Unique grease lubricated ball bearing canned motor pump
US4957417A (en) * 1989-07-14 1990-09-18 Kabushiki Kaisha Kobe Seiko Sho Vertical oilless screw vacuum pump

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080302097A1 (en) * 2005-04-01 2008-12-11 Gunter Andres Hydraulic Unit
US8220380B2 (en) * 2005-04-01 2012-07-17 Wagner Vermögensverwaltungs-GmbH & Co. KG Hydraulic unit
US20080080988A1 (en) * 2006-09-28 2008-04-03 Snecma Pump with electric motor, immersed in the fluid to be pumped
US20080267763A1 (en) * 2007-04-30 2008-10-30 Snecma Rotary machine including a passive axial balancing system
US20110064592A1 (en) * 2008-04-10 2011-03-17 Axel Jaeschke Underwater Delivery Unit
US9103342B2 (en) * 2008-04-10 2015-08-11 Joh. Heinr. Bornemann Gmbh Underwater delivery unit
US20130195618A1 (en) * 2009-10-13 2013-08-01 MAN Diesel &Turbo SE Underwater Compressor Arrangement And Underwater Process Fluid Conveying Arrangement Equipped Therewith
US20120224985A1 (en) * 2011-03-02 2012-09-06 Baker Hughes Incorporated Electric submersible pump floating ring bearing and method to assemble same
US20130189133A1 (en) * 2012-01-19 2013-07-25 Danfoss (Tianjin) Ltd. Compressor and method of assembling compressor
CN102996469A (zh) * 2012-12-24 2013-03-27 成都安迪生测量有限公司 一种多头螺旋密封的低温潜液泵
CN103573651A (zh) * 2013-11-08 2014-02-12 成都安迪生测量有限公司 一种lng潜液泵
CN103618414A (zh) * 2013-12-26 2014-03-05 大连深蓝泵业有限公司 一种新型低温潜液电机
CN105298824A (zh) * 2014-06-27 2016-02-03 安瑞科(廊坊)能源装备集成有限公司 一种lng潜液泵系统
US11274679B2 (en) * 2017-02-14 2022-03-15 Danfoss A/S Oil free centrifugal compressor for use in low capacity applications
WO2020127977A1 (en) 2018-12-20 2020-06-25 Fsubsea As Subsea pump system with process lubricated bearings
US12163525B2 (en) 2018-12-20 2024-12-10 Fsubsea As Subsea pump system with process lubricated bearings

Also Published As

Publication number Publication date
JP4300088B2 (ja) 2009-07-22
EP1519053A3 (en) 2009-04-08
EP1519053A2 (en) 2005-03-30
JP2005105897A (ja) 2005-04-21

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Date Code Title Description
AS Assignment

Owner name: NIKKISO CO. LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TANI, NORIFUMI;REEL/FRAME:015859/0644

Effective date: 20040917

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION