US20040076532A1 - Canned motor and canned motor pump - Google Patents

Canned motor and canned motor pump Download PDF

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Publication number
US20040076532A1
US20040076532A1 US10/250,689 US25068903A US2004076532A1 US 20040076532 A1 US20040076532 A1 US 20040076532A1 US 25068903 A US25068903 A US 25068903A US 2004076532 A1 US2004076532 A1 US 2004076532A1
Authority
US
United States
Prior art keywords
stator
rotor
canned motor
main shaft
pump
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
US10/250,689
Other languages
English (en)
Inventor
Yoshiaki Miyazaki
Hiroshi Uchida
Kenichi Kajiwara
Kozo Matake
Kaname Kurita
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.)
Ebara Corp
Original Assignee
Individual
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 Individual filed Critical Individual
Assigned to EBARA CORPORATION reassignment EBARA CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAJIWARA, KENICHI, KURITA, KANAME, MATAKE, KOZO, MIYAZAKI, YOSHIAKI, UCHIDA, HIROSHI
Publication of US20040076532A1 publication Critical patent/US20040076532A1/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
    • F04D29/043—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/064—Details of the magnetic circuit
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium

Definitions

  • the present invention relates to a canned motor and a canned motor pump, and more particularly to a canned motor which can be manufactured more easily to lower a manufacturing cost, and a canned motor pump having such canned motor.
  • FIG. 2 shows a conventional canned motor pump which has a typical structure and incorporates a canned motor therein.
  • a canned motor pump incorporates a canned motor which comprises a stator 12 housed in a motor frame 10 and a rotor 16 fixed to a main shaft 14 .
  • a substantially cylindrical stator can 18 is provided so as to surround an inner circumferential surface of the stator 12 hermetically, and a substantially cylindrical rotor can 20 is provided so as to surround an outer circumferential surface of the rotor 16 hermetically.
  • a through-hole 14 a is formed axially in the central portion of the main shaft 14 , and a projection 14 b is formed so as to extend axially from one end of the main shaft 14 .
  • the projection 14 b has a male screw on its outer circumferential surface, and allows an impeller to be attached thereto.
  • an impeller 26 is mounted on the projection 14 b onto which a nut 22 is screwed, thereby fixing the impeller 26 to the projection 14 b .
  • the impeller 26 is housed in a pump casing 28 which is formed, in this embodiment, by assembling pressed products manufactured by press-forming of sheet metal such as stainless steel plate, and has a suction port 28 a and a discharge port 28 b .
  • the pump casing composed of the pressed products is referred to as a press d pump casing.
  • a bracket 30 is disposed between the motor frame 10 and the pressed pump casing 28 , and the main shaft 14 is rotatably supported by a bearing 34 held by a bearing bracket 32 attached to the bracket 30 , and a bearing 36 provided at the opposite side of the impeller 26 .
  • the through-hole 14 a is formed in the main shaft 14 by drilling a solid round bar using a drill or the like, and then the outer circumferential surface of the main shaft 14 is processed by a certain work, thus producing the main shaft 14 having a desired shape.
  • the stator can 18 is processed by deep-drawing into a cylindrical receptacle shape such that the stator can 18 has a smaller-diameter portion 18 a at one end thereof and an open end at the other end thereof.
  • the smaller-diameter portion 18 a of the stator can 18 is fixedly held between the inner circumferential surface of the motor frame 10 and an outer ring 36 a of the bearing 36 , and the other open end of the stator can 18 is fixed to the inner circumferential surface of the bracket 30 by welding. Further, the smaller-diameter portion 18 a of the stator can 18 has an opening into which a plug 38 is fitted, and a bolt 40 is screwed into the plug 38 , thus blocking up the opening of the smaller-diameter portion 18 a .
  • the rotor can 20 has both open ends to which a pair of rotor side plates 42 are fixed by welding, respectively. Each of the rotor side plates 42 is fixed to the outer circumferential surface of the main shaft 14 by welding.
  • the main shaft is formed by drilling a solid round bar using a drill or the like because the main shaft is required to provide the portion having a sufficient rigidity to which an inner ring of the bearing is attached, and the portion to which the impeller is attached.
  • the main shaft is considerably long, and hence the drilling process is difficult and much man-hour for such drilling process is necessary.
  • the working efficiency of welding is generally low to cause an increase in the manufacturing cost. Therefore, there has been a strong demand for reducing the number of welding processes in fixing the stator can and the rotor can and for performing the welding processes so as to ensure a highly hermetical condition.
  • the present invention has been made in view of the above, and it is therefore an object of the present invention to provide a canned motor which can be manufactured more easily to lower a manufacturing cost without deteriorating its performance, and a canned motor pump having such canned motor.
  • a canned motor comprising: a stator; a rotor provided in the stator; and a main shaft for supporting the rotor, the main shaft comprising: a hollow pipe; and plug members fitted into both ends of the hollow pipe, the plug members having respective through-holes.
  • the main shaft comprises a commercial hollow pipe which is additionally machined by boring or the like, it is not necessary to drill the main shaft using a drill or the like. Therefore, the manufacturing process is facilitated, and the man-hour required for working is reduced. Further, the plug member allows the hollow main shaft to be sufficiently rigid and allows the impeller to be attached to the hollow main shaft.
  • a canned motor comprising: a stator; a stator can surrounding the stator hermetically; a rotor provided in the stator; a main shaft for supporting the rotor; and a rotor can surrounding the rotor hermetically; wherein the rotor can has one end fixed to an outer circumferential surface of the main shaft and the other end fixed to an outer circumferential surface of a rotor side plate. Therefore, one of the rotor side plates which have been heretofore required can be eliminated to thus reduce the number of welding processes and improve the hermetically sealed condition of the rotor.
  • a canned motor comprising: a motor frame; a stator provided in the motor frame; a substantially cylindrical stator can surrounding the stator hermetically; a rotor provided in the stator; a main shaft for supporting the rotor; and a rotor can surrounding the rotor hermetically; wherein the stator can has an open end which is fixedly held by the stator and a bracket provided on an open end of the motor frame. Therefore, the stator can can be fixed without welding.
  • a canned motor further comprises an O-ring interposed between the stator and the bracket. Therefore, the hermetically sealed condition in the stator can be kept by the O-ring, instead of welding used in the conventional process.
  • a canned motor pump comprising: a canned motor according to any one of claims 1 to 4 ; a pump casing connected to one end of the canned motor; and an impeller housed in the pump casing and supported by the main shaft of the canned motor.
  • FIG. 1 is a cross-sectional view showing a canned motor pump which incorporates a canned motor according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view showing a conventional canned motor pump.
  • a canned motor and a canned motor pump having such canned motor according to an embodiment of the present invention will be described below with reference to FIG. 1.
  • a canned motor pump incorporates a canned motor which comprises a stator 12 housed in a motor frame 10 and a rotor 16 fixed to a main shaft 14 .
  • a substantially cylindrical stator can 18 is provided so as to surround an inner circumferential surface of the stator 12 hermetically, and a substantially cylindrical rotor can 20 is provided so as to surround an outer circumferential surface of the rotor 16 hermetically.
  • the main shaft 14 comprises a commercial hollow pipe 50 whose both ends are processed by boring, and plug members 52 , 54 which are fitted into the both bored ends of the commercial hollow pipe 50 .
  • the plug member 52 having a through-hole 52 a is fitted into the bored end of the hollow pipe 50 at the opposite side of an impeller, and an inner ring 36 b constituting a part of a bearing 36 is fixed to the exposed end of the plug member 52 through a sleeve 56 .
  • the plug member 54 having a through-hole 54 a is fitted into the bored end of the hollow pipe 50 at the impeller side, and a supporting member 58 is attached to the exposed portion of the plug member 54 .
  • the supporting member 58 supports an inner ling 34 a constituting a part of a bearing 34 .
  • the plug member 54 has a projection 54 b at its one end, the projection 54 b has a male screw on its outer circumferential surface, and a nut 22 is screwed onto the projection 54 b to allow an impeller 26 to be fixed to the projection 54 b.
  • the impeller 26 is housed in a pump casing 28 which is formed by assembling pressed products manufactured by press-forming of sheet metal such as stainless steel plate, and has a suction port 28 a and a discharge port 28 b.
  • a bracket 30 is disposed between the motor frame 10 and the pressed pump casing 28 , and the main shaft 14 is rotatably supported by the bearing 34 held by a bearing bracket 32 attached to the bracket 30 , and the bearing 36 provided at the opposite side of the impeller 26 .
  • the main shaft 14 comprises a commercial hollow pipe 50 which is additionally machined by boring or the like, it is not necessary to drill the main shaft 14 using a drill or the like. Therefore, the manufacturing process is facilitated, and the man-hour required for working is reduced.
  • the plug members 52 and 54 allow the hollow main shaft 14 to be sufficiently rigid enough to support the inner rings 34 a , 36 b of the bearings 34 , 36 , and the projection 54 b of the plug member 54 allows the impeller 26 to be attached to the hollow main shaft 14 .
  • the stator can 18 is processed by deep-drawing into a cylindrical receptacle shape such that the stator can 18 has a smaller-diameter portion 18 a at one end thereof, and further processed by bulging such that the stator can 18 has a flange 18 b at the other open end thereof.
  • the smaller-diameter portion 18 a of the stator can 18 is fixedly held between the inner circumferential surface of the motor frame 10 and an outer ring 36 a of the bearing 36
  • the flange 18 b formed at the other open end of the stator can 18 is fixedly held between the end surface of the stator 12 and the bracket 30 .
  • an O-ring 60 is interposed between the inner circumferential surface of the stator can 18 and the bracket 30 to keep a hermetically sealed condition in the stator 12 .
  • the stator can 18 is fixed without welding, and the hermetically sealed condition in the stator 12 can be kept by the O-ring 60 , instead of welding used in the conventional process.
  • the stator can 18 has an increased rigidity enough to prevent the stator can 18 from being deformed toward the inside of the stator 12 due to an internal pump pressure.
  • the rotor can 20 has a smaller-diameter portion 20 a at one end thereof.
  • a rotor side plate 42 is disposed only at one open end of the rotor can 20 located at an impeller side, and welded and fixed to the outer circumferential surface of the main shaft 14 .
  • the smaller-diameter portion 20 a of the rotor can 20 is welded to the outer circumferential surface of the main shaft 14 , and the open end of the rotor can 20 is welded to the rotor side plate 42 , thus fixing the rotor can 20 at a predetermined location.
  • one of the rotor side plates 42 which have been heretofore required can be eliminated to thus reduce the number of welding processes and improve the hermetically sealed condition of the rotor 16 .
  • the pair of the rotor side plates 42 has been disposed at the both ends of the rotor 16 , and the rotor side plates 42 have been welded to the outer circumferential surface of the main shaft 14 and the both ends of the stator can 20 , respectively.
  • the welding process for one rotor side plate is not necessary. More specifically, even though the welding process of the main shaft 14 and the rotor can 20 is necessary at the smaller-diameter portion 20 a , the welding process of the rotor can 20 and one of the rotor side plates can be eliminated.
  • the present invention can provide a canned motor which can be manufactured more easily to reduce man-hour for working and lower a manufacturing cost without deteriorating its performance, and a canned motor pump having such canned motor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US10/250,689 2001-01-19 2002-01-18 Canned motor and canned motor pump Abandoned US20040076532A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001011778A JP2002213385A (ja) 2001-01-19 2001-01-19 キャンドモータ及びキャンドモータポンプ
JP2001-11778 2001-01-19
PCT/JP2002/000310 WO2002058213A1 (en) 2001-01-19 2002-01-18 Canned motor and canned motor pump

Publications (1)

Publication Number Publication Date
US20040076532A1 true US20040076532A1 (en) 2004-04-22

Family

ID=18878872

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/250,689 Abandoned US20040076532A1 (en) 2001-01-19 2002-01-18 Canned motor and canned motor pump

Country Status (7)

Country Link
US (1) US20040076532A1 (da)
EP (1) EP1352461B1 (da)
JP (1) JP2002213385A (da)
CN (2) CN100405705C (da)
DE (1) DE60218821T2 (da)
DK (1) DK1352461T3 (da)
WO (1) WO2002058213A1 (da)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1775478A2 (de) * 2005-10-13 2007-04-18 TCG Unitech Systemtechnik GmbH Kühlmittelpumpe
US20070286752A1 (en) * 2006-06-08 2007-12-13 Oase Gmbh Water Pump Especially for Ponds, Aquariums, Fountains or the Like
US20110116952A1 (en) * 2009-11-19 2011-05-19 Hyundai Motor Company Electric water pump
US20110116948A1 (en) * 2009-11-19 2011-05-19 Hyundai Motor Company Method for manufacturing stator for electric water pump
CN102072129A (zh) * 2009-11-19 2011-05-25 现代自动车株式会社 电动水泵
EP2428681A1 (fr) * 2010-09-08 2012-03-14 Pompes Salmson Pompe de circulation
US20130169074A1 (en) * 2011-12-31 2013-07-04 Sheikh Nayyer Hussain Synchronous relcutance motor for conducting media
US9261096B2 (en) 2011-07-29 2016-02-16 Regal Beloit America, Inc. Pump motor combination
CN109790847A (zh) * 2016-09-02 2019-05-21 丹佛斯硅动力有限责任公司 模块化涡轮压缩机轴

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20030364U1 (it) * 2003-07-30 2005-01-31 Ind Saleri Italo Spa Pompa elettrica per circuiti di raffreddamento
DE102013020387A1 (de) * 2013-12-10 2015-06-11 Wilo Se Nassläufermotorpumpe
CN109964391B (zh) * 2016-11-23 2022-04-29 日本电产株式会社 马达和电动助力转向装置
JP7029991B2 (ja) * 2018-03-22 2022-03-04 株式会社荏原製作所 カスケードポンプ
CN109538497B (zh) * 2018-12-06 2021-04-13 合肥恒大江海泵业股份有限公司 一种干定子叶轮内置式潜水贯流泵

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465437A (en) * 1981-02-14 1984-08-14 Grundfos A/S Pump comprising a canned motor
US5009578A (en) * 1987-10-27 1991-04-23 Crane Co. Motor driven pumps
US5144177A (en) * 1988-10-12 1992-09-01 Ksb Aktiengesellschaft Canned motor pump with heat exchanger in rotor chamber
US5494403A (en) * 1992-04-14 1996-02-27 Ebara Corporation Full-circumferential flow pump
US5627420A (en) * 1994-12-16 1997-05-06 Westinghouse Electric Corporation Pump powered by a canned electric motor having a removable stator cartridge
US5692886A (en) * 1993-12-08 1997-12-02 Ebara Corporation Canned motor pump having concentric bearings
US6010319A (en) * 1996-11-29 2000-01-04 Daewoo Electronics Co., Ltd. Canned motor pump
US6060805A (en) * 1996-08-12 2000-05-09 Ebara Corporation Canned motor
US6863504B2 (en) * 2002-02-28 2005-03-08 Standex International Corp. Fluid pump relief valve

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1527993A (fr) * 1967-04-21 1968-06-07 Pompe d'accélération, sans presse-étoupe, pour installations de chauffage central à eau chaude
DE2048467A1 (de) * 1970-10-02 1971-11-11 Hanning Elektro Werke Heizungsumwälzpumpe
FR2075332A5 (da) * 1971-01-08 1971-10-08 Matsushita Electric Ind Co Ltd
DE3609311A1 (de) * 1986-03-20 1987-10-01 Homa Pumpenfabrik Gmbh Kreiselpumpe
DE3931665C1 (en) * 1989-09-22 1991-02-21 Wilo-Werk Gmbh & Co Pumpen- Und Apparatebau, 4600 Dortmund, De Split-ring electric motor for pump - has feeder coupled to pump chamber at point exhibiting high pressure
DE4208829C2 (de) * 1992-03-19 1995-04-27 Wilo Gmbh Spaltrohrmotorpumpe
DE19934819C1 (de) * 1999-07-24 2000-12-07 Honeywell Ag Mischventil

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4465437A (en) * 1981-02-14 1984-08-14 Grundfos A/S Pump comprising a canned motor
US5009578A (en) * 1987-10-27 1991-04-23 Crane Co. Motor driven pumps
US5144177A (en) * 1988-10-12 1992-09-01 Ksb Aktiengesellschaft Canned motor pump with heat exchanger in rotor chamber
US5494403A (en) * 1992-04-14 1996-02-27 Ebara Corporation Full-circumferential flow pump
US5692886A (en) * 1993-12-08 1997-12-02 Ebara Corporation Canned motor pump having concentric bearings
US5627420A (en) * 1994-12-16 1997-05-06 Westinghouse Electric Corporation Pump powered by a canned electric motor having a removable stator cartridge
US6060805A (en) * 1996-08-12 2000-05-09 Ebara Corporation Canned motor
US6010319A (en) * 1996-11-29 2000-01-04 Daewoo Electronics Co., Ltd. Canned motor pump
US6863504B2 (en) * 2002-02-28 2005-03-08 Standex International Corp. Fluid pump relief valve

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1775478A2 (de) * 2005-10-13 2007-04-18 TCG Unitech Systemtechnik GmbH Kühlmittelpumpe
EP1775478A3 (de) * 2005-10-13 2008-05-21 TCG Unitech Systemtechnik GmbH Kühlmittelpumpe
US20070286752A1 (en) * 2006-06-08 2007-12-13 Oase Gmbh Water Pump Especially for Ponds, Aquariums, Fountains or the Like
US8961154B2 (en) 2009-11-19 2015-02-24 Hyundai Motor Company Electric water pump
US20110116948A1 (en) * 2009-11-19 2011-05-19 Hyundai Motor Company Method for manufacturing stator for electric water pump
CN102072129A (zh) * 2009-11-19 2011-05-25 现代自动车株式会社 电动水泵
US8839503B2 (en) 2009-11-19 2014-09-23 Hyundai Motor Company Method for manufacturing stator for electric water pump
US20110116952A1 (en) * 2009-11-19 2011-05-19 Hyundai Motor Company Electric water pump
EP2428681A1 (fr) * 2010-09-08 2012-03-14 Pompes Salmson Pompe de circulation
US9261096B2 (en) 2011-07-29 2016-02-16 Regal Beloit America, Inc. Pump motor combination
US20130169074A1 (en) * 2011-12-31 2013-07-04 Sheikh Nayyer Hussain Synchronous relcutance motor for conducting media
CN109790847A (zh) * 2016-09-02 2019-05-21 丹佛斯硅动力有限责任公司 模块化涡轮压缩机轴
US10794390B2 (en) * 2016-09-02 2020-10-06 Danfoss Silicon Power Gmbh Modular turbo compressor shaft

Also Published As

Publication number Publication date
EP1352461B1 (en) 2007-03-14
JP2002213385A (ja) 2002-07-31
WO2002058213A1 (en) 2002-07-25
CN100405705C (zh) 2008-07-23
DE60218821T2 (de) 2007-12-06
CN1488186A (zh) 2004-04-07
CN1241314C (zh) 2006-02-08
EP1352461A1 (en) 2003-10-15
DK1352461T3 (da) 2007-06-04
DE60218821D1 (de) 2007-04-26
CN1812230A (zh) 2006-08-02

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Legal Events

Date Code Title Description
AS Assignment

Owner name: EBARA CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MIYAZAKI, YOSHIAKI;UCHIDA, HIROSHI;KAJIWARA, KENICHI;AND OTHERS;REEL/FRAME:014762/0726

Effective date: 20030709

STCB Information on status: application discontinuation

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