WO2022254959A1 - キャンドモータポンプの軸受構造 - Google Patents

キャンドモータポンプの軸受構造 Download PDF

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Publication number
WO2022254959A1
WO2022254959A1 PCT/JP2022/016912 JP2022016912W WO2022254959A1 WO 2022254959 A1 WO2022254959 A1 WO 2022254959A1 JP 2022016912 W JP2022016912 W JP 2022016912W WO 2022254959 A1 WO2022254959 A1 WO 2022254959A1
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WIPO (PCT)
Prior art keywords
bearing
rotor
rotating shaft
elastic
impeller
Prior art date
Application number
PCT/JP2022/016912
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
銀春 曹
伸昭 内海
Original Assignee
三相電機株式会社
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 三相電機株式会社 filed Critical 三相電機株式会社
Priority to KR1020237040864A priority Critical patent/KR20240004667A/ko
Priority to CN202280039152.5A priority patent/CN117460892A/zh
Priority to JP2023525643A priority patent/JP7525739B2/ja
Publication of WO2022254959A1 publication Critical patent/WO2022254959A1/ja

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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
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/06—Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/08—Attachment of brasses, bushes or linings to the bearing housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
    • 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
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings

Definitions

  • the present invention relates to a bearing structure for a canned motor pump.
  • This application claims priority based on Japanese Patent Application No. 2021-094287 filed in Japan on June 4, 2021, the content of which is incorporated herein.
  • the canned motor pump disclosed in Patent Document 1 includes a slide bearing (hereinafter referred to as “radial direction bearing”) that supports the rotating shaft in a direction perpendicular to the axial direction, and a slide bearing (hereinafter referred to as “radial direction bearing”) fixed to the rotating shaft. (referred to as “thrust direction bearing”).
  • the thrust direction bearing restricts the axial movement of the rotating shaft by bringing its contact surface into contact with the side surface of the radial direction bearing in the axial direction.
  • a certain gap is provided between the rotating shaft and the radial direction bearing to allow part of the liquid sent by the pump to flow.
  • the radial direction bearing is fitted into the bearing housing via an elastic thin plate member such as a tolerance ring.
  • the side surface of the radial direction bearing and the contact surface of the thrust direction bearing may tilt relative to each other and may not come into contact with each other.
  • part of the side surface of the radial direction bearing and part of the contact surface of the thrust direction bearing progress, and the initial axial play of the rotating shaft and the initial inclination of the rotating shaft with respect to the axial direction gradually decrease.
  • the noise would be amplified and the performance of the pump would be degraded.
  • the present invention has been invented in view of the above problems.
  • An object of the present invention is to provide a bearing structure for a canned motor pump.
  • a bearing structure for a canned motor pump includes a rotary shaft that rotates integrally with a rotor of a motor section, and a casing-side bearing housing that is provided in the pump section, and is fitted through an elastic thin plate material. a bearing that supports the rotating shaft in a direction perpendicular to the axial direction; and a bearing that is attached to the rotating shaft between the rotor of the motor section and the bearing, and is rotatably supported in the axial direction by the bearing.
  • An elastic structure that applies an elastic reaction force in the axial direction to one or both of the bearing and the bearing-supported member when the bearing is pressed by the bearing-supporting member toward the side opposite to the rotor of the motor unit. is provided.
  • a canned motor pump bearing structure is the canned motor pump bearing structure according to the first aspect, wherein the elastic structure imparts the elastic reaction force to the bearing in the axial direction. and an elastic body provided between the side of the bearing opposite to the rotor of the motor section and the casing-side bearing housing.
  • a bearing structure for a canned motor pump according to a third aspect of the present invention is the bearing structure for a canned motor pump according to the first aspect, wherein the bearing supported member is attached to the rotating shaft via a bearing supported member housing. It is The elastic structure imparts the elastic reaction force to the bearing-supported member in the axial direction. is an elastic body provided between
  • a bearing structure for a canned motor pump according to a fourth aspect of the present invention is the bearing structure for a canned motor pump according to the first aspect, wherein the elastic structure is formed on the side opposite to the rotor of the motor portion of the bearing and on the casing side.
  • a plate member is provided between the bearing housing and the bearing housing. The casing-side bearing housing axially supports only a part of the surface of the plate member opposite to the bearing, thereby imparting the elastic reaction force to the bearing in the axial direction.
  • a bearing structure for a canned motor pump according to a fifth aspect of the present invention is the bearing structure for a canned motor pump according to the first aspect, wherein the bearing-supported member is arranged with respect to the rotating shaft via a bearing-supported-member housing. are axially fixed.
  • a plate member is provided between the rotor side of the motor portion of the bearing support member and the housing for the bearing support member, and the housing for the bearing support member supports the bearing support member of the plate member.
  • the bearing and the bearing-supported member are likely to come into surface contact with each other.
  • FIG. 1 is a partial cross-sectional view of a canned motor pump according to this embodiment; FIG. It is an enlarged cross-sectional view around the first bearing according to the present embodiment.
  • FIG. 2 is an enlarged view of part A in FIG. 1; FIG. 2 is an enlarged view of a B portion in FIG. 1; It is an expanded sectional view of the connection pipe periphery which concerns on another embodiment.
  • It is an enlarged cross-sectional view around an elastic structure according to another embodiment.
  • 4 is an enlarged cross-sectional view of the periphery of the elastic structure according to the present embodiment; FIG. It is an enlarged cross-sectional view around an elastic structure according to another embodiment. 4 is an enlarged cross-sectional view of the periphery of the elastic structure according to the present embodiment; FIG. It is an enlarged cross-sectional view around an elastic structure according to another embodiment. 4 is an enlarged cross-sectional view of the periphery of the elastic structure according to the present embodiment; FIG.
  • the canned motor pump bearing structure 1 includes a rotating shaft 2, bearings 3a and 3b, bearing-supporting members 4a and 4b, impellers 6a and 6b, and elastic shafts included in a canned motor pump 8. It is composed of structure 7 and the like.
  • the canned motor pump 8 includes a motor section 11 and a pump section 31 driven by the motor section 11, as shown in FIG.
  • the motor unit 11 is a canned motor composed of a rotor 12 having a magnet 27 and a stator 13 on the outer periphery of the rotor 12.
  • the rotating shaft 2 to which the rotor 12 is fixed is mounted on bearings attached to casing-side bearing housings 32a and 32b. It is supported by sleeves 25 between 3a and 3b.
  • the pump section 31 includes impellers 6a and 6b fixed to the rotating shaft 2 and pump casings 16a and 16b having impeller housing spaces 14a and 14b for housing the impellers 6a and 6b.
  • a rotor 12 of the motor portion 11 is accommodated inside the stator can 9 .
  • the stator 13 of the motor portion 11 is accommodated between the outer peripheral surface 17 of the stator can 9 and the inner peripheral surface 19 of the cylindrical motor frame 18 at a position corresponding to the rotor 12 within the stator can 9 .
  • a motor frame 18 encloses a stator can 9 .
  • the stator can 9 and the stator side plates 10 provided at both ends of the motor frame 18 are hermetically connected by welding.
  • the motor frame 18 and the stator side plates 10 provided at both ends of the motor frame 18 are sealed by O-rings 5 and hermetically connected by partial welding.
  • the stator side plate 10 and the casing-side bearing housings 32 a and 32 b seal an internal space 66 with O-rings 15 provided at both ends of the stator side plate 10 .
  • Pump casings 16a, 16b and casing-side bearing housings 32a, 32b seal impeller housing spaces 14a, 14b with O-rings 20 disposed at both ends of casing-side bearing housings 32a, 32b. Since a minute gap is formed between the inner peripheral surfaces of the bearings 3a and 3b and the sleeve 25, the bearings 3a and 3b can be tilted at a minute angle with respect to the axis.
  • the pump casing 16a will be referred to as "first pump casing 16a” and the pump casing 16b will be referred to as "second pump casing 16b".
  • a support can 22 covers a portion of the outer peripheral surface 17 of the stator can 9 where the stator core 21 does not exist.
  • the support can 22 has a cylindrical shape along the outer peripheral surface 17 of the stator can 9 .
  • the motor unit 11 includes a rotor 12 and a stator 13.
  • the rotor 12 includes a rotor can 23, a rotor side plate 24, a rotor body 26, a magnet 27, a yoke 28, and the like.
  • the rotor 12 is fixed to the rotating shaft 2 so as to rotate together with the rotating shaft 2 .
  • the rotating shaft 2 is supported via a sleeve 25 by bearings 3a, 3b attached to casing-side bearing housings 32a, 32b.
  • the rotor 12 includes a rotor body 26 fixed to the rotating shaft 2 , a yoke 28 supported by the rotor body 26 , a magnet 27 , a rotor side plate 24 and a rotor can 23 .
  • the rotor can 23 is welded to the rotor main body 26 and the rotor side plate 24, and the magnet 27 and the yoke 28 are sealed.
  • the rotor 12 is housed inside the stator can 9 in the canned motor pump
  • the stator 13 is composed of an electromagnetic coil 29 and the like, and when a drive current is supplied to the stator 13, the rotor 12 and the rotating shaft 2 are rotationally driven.
  • the rotor 12 of the motor section 11 is fixed to the rotary shaft 2 and rotates together with the rotor 12 of the motor section 11 .
  • the bearings 3a and 3b are fitted into casing-side bearing housings 32a and 32b provided in the pump section 31 with thin elastic plates 33 interposed therebetween.
  • the bearings 3a and 3b support the rotary shaft 2 so as to be rotatable in a direction perpendicular to the axial direction.
  • the bearings 3a, 3b are cylindrical.
  • a radially extending groove 76 is formed in the axial end surface 34 of the bearings 3a, 3b, and a spiral groove 74 is formed in the inner peripheral wall 36 thereof. Both grooves 74, 76 are provided for liquid flow.
  • SiC silicon silicon carbide
  • the bearings 3a and 3b are arranged on the outer periphery of the sleeve 25 which is one member of the rotating shaft 2.
  • the material of the sleeve 25 a material having excellent heat resistance and durability is used, like the bearings 3a and 3b.
  • the bearings 3 a and 3 b are provided on both sides of the rotor 12 of the motor section 11 in the axial direction of the rotating shaft 2 .
  • the bearing 3a will be referred to as the “first bearing 3a” and the bearing 3b will be referred to as the “second bearing 3b”.
  • the bearings 3a, 3b are fitted in the casing-side bearing housings 32a, 32b.
  • the casing-side bearing housings 32 a and 32 b are provided in the pump section 31 .
  • the casing-side bearing housings 32 a and 32 b are provided on both sides of the rotor 12 of the motor section 11 in the axial direction of the rotating shaft 2 .
  • the two casing-side housings 32 are hereinafter referred to as “first casing-side bearing housing 32a” and “second casing-side bearing housing 32b", respectively.
  • a tolerance ring is used as the elastic thin plate member 33 in this embodiment. Since the bearings 3a and 3b are fitted in the casing-side bearing housings 32a and 32b through the elastic thin plate member 33, the bearings 3a and 3b are prevented from rattling with the casing-side bearing housings 32a and 32b, thereby preventing the casing-side bearing housings from rattling. The difference in thermal expansion coefficient between 32a, 32b and bearings 3a, 3b is absorbed.
  • the rotating shaft 2 and the rotor 12 are provided with bearing-supported member housings 38a and 38b that accommodate the bearing-supported members 4a and 4b.
  • the bearing-supported members 4a and 4b are fitted into bearing-supported-member housings 38a and 38b via elastic thin plate members 35 for the bearing-supported member.
  • a tolerance ring is also used for the thin elastic plate member 35 for the bearing-supported member.
  • Housings 38a and 38b for bearing-supported members are relatively fixed to the rotating shaft 2 in the axial direction.
  • the bearing-supported members 4a and 4b are attached to the rotary shaft 2 via bearing-supported member housings 38a and 38b.
  • the rotating shaft 2 is axially supported by the bearings 3a and 3b via the bearing-supported members 4a and 4b and the bearing-supported member housings 38a and 38b.
  • a gap of a predetermined size is formed, and the bearing-supported members 4a and 4b are positioned relative to the axis. can be tilted at a small angle.
  • the bearing-supported members 4 a and 4 b are also provided on both sides of the rotor 12 of the motor section 11 in the axial direction of the rotating shaft 2 .
  • the bearing-supported members 4a and 4b are attached to the rotary shaft 2 between the rotor 12 of the motor section 11 and the bearings 3a and 3b, and are rotatably supported in the axial direction by the bearings 3a and 3b.
  • SiC which is excellent in heat resistance and durability, is used as the material of the bearing-supported members 4a and 4b.
  • first bearing-supported member 4a the bearing-supported member 4a supported by the first bearing 3a
  • second bearing-supported member 4b the bearing-supported member 4b supported by the second bearing 3b
  • the impellers 6a and 6b rotate integrally with the rotating shaft 2.
  • the impellers 6a and 6b include cylindrical impeller boss portions 39a and 39b fixed to the rotating shaft 2 and annular plate-like impeller blade portions connected to the impeller boss portions 39a and 39b. 45a and 45b.
  • the impeller bosses 39a and 39b are cylindrical, and include a rotating shaft fixing portion 47 for fixing the impeller bosses 39a and 39b to the rotating shaft 2, and a radial direction of the rotating shaft fixing portion 47 from the outer peripheral surface of the rotating shaft fixing portion 47. and an impeller blade connection portion 48 which is in the shape of an extended annular plate and is connected to the impeller blade portions 45a and 45b.
  • the impeller boss portions 39a and 39b are connected to the rotation center side end portions 46 of the impeller blade portions 45a and 45b at impeller blade connection portions 48, respectively.
  • Impeller boss portion through holes 49a and 49b are provided in the impeller boss portions 39a and 39b so as to extend therethrough in the axial direction. Liquid flowing back from the stator can 9 side passes through the impeller boss portion through holes 49a and 49b.
  • Annular impeller boss projections 51a and 51b extending toward the stator can 9 are provided at the impeller blade connecting portion 48 of the impeller bosses 39a and 39b to prevent backflow of liquid.
  • the impeller boss projections 51a, 51b are inserted into annular recesses 53a, 53b formed in the inner wall surfaces 52 of the pump casings 16a, 16b.
  • impellers 6a and 6b are provided one each on both ends of the stator can 9 in the axial direction.
  • the impeller 6a will be referred to as the "first impeller 6a”
  • the impeller 6b will be referred to as the "second impeller 6b”.
  • a first inlet 56 is provided on the side surface of the first pump casing 16a housing the first impeller 6a. Further, the upper surface of the first pump casing 16a is provided with a liquid feed port 57 that feeds the liquid that has flowed into the first pump casing 16a to the second pump casing 16b.
  • the first casing-side bearing housing 32a has a first communication passage 67 that communicates the first impeller housing space 14a and the internal space 66 of the stator can 9.
  • the first communication passage opening 64 of the first communication passage 67 is located on the wall surface 63 of the first impeller housing space 14a on the side of the stator can 9, and is positioned closer to the rotation shaft 2 than the first impeller boss projection piece 51a. It is provided in the vicinity of the impeller boss part through-hole 49a.
  • the first casing side bearing housing 32a forms the first impeller housing space 14a together with the first pump casing 16a.
  • the first casing-side bearing housing 32a has a first concave portion 53a on a wall surface 63 on the stator can 9 side that forms the first impeller housing space 14a.
  • a first impeller boss projection piece 51a provided on the first impeller boss portion 39a is inserted into the first recess 53a.
  • first impeller blade portion 45a is provided with a cylindrical first closing plate 78 coaxially centered on the rotating shaft 2.
  • the first blocking plate 78 extends in the axial direction of the rotating shaft 2 toward the first inlet 56, and reduces the gap between the outer peripheral surface thereof and the inner wall 77 of the first inlet 56 in the first pump casing 16a.
  • the first blocking plate 78 is located between a space formed by an outer wall 79 of the first impeller blade portion 45a on the side of the first blocking plate 78 and the inner wall 54 of the first pump casing 16a and a space at the first inlet 56. occlude the
  • the second impeller 6b which is the other impeller, includes a second impeller boss portion 39b fixed to the rotating shaft 2 and a second impeller blade portion 45b connected to the second impeller boss portion 39b, as shown in FIG. ing.
  • the second impeller boss portion 39b is provided with an annular second impeller boss portion projection piece 51b extending in the axial direction and in the stator can 9 side direction.
  • a second inlet 58 is provided on the side surface of the second pump casing 16b housing the second impeller 6b.
  • the second inlet 58 has a cylindrical shape with a central axis coaxial with the rotating shaft 2, and allows the liquid sent from the first impeller 6a to flow therein.
  • a discharge port 61 is provided on the upper surface side of the second pump casing 16b to discharge the liquid that has flowed into the second pump casing 16b to the outside of the second pump casing 16b.
  • the second casing-side bearing housing 32b has a second communication passage 71 that communicates the second impeller housing space 14b and the internal space 66 of the stator can 9.
  • the second communication passage opening 69 of the second communication passage 71 is located on the wall surface 68 of the second impeller housing space 14b on the side of the stator can 9, and is positioned closer to the rotation shaft 2 than the second impeller boss projection piece 51b. It is provided in the vicinity of the impeller boss part through-hole 49b.
  • the second casing side bearing housing 32b forms the second impeller housing space 14b together with the second pump casing 16b.
  • the second casing-side bearing housing 32b has a second concave portion 53b on a wall surface 68 on the stator can 9 side that forms the second impeller housing space 14b.
  • a second impeller boss projection piece 51b provided on the second impeller boss portion 39b is inserted into the second recess 53b.
  • the second impeller blade portion 45b is provided with a cylindrical second closing plate 82 that is coaxial with the rotating shaft 2.
  • the second blocking plate 82 extends in the axial direction of the rotary shaft 2 toward the second inlet 58, and reduces the gap between the outer peripheral surface thereof and the inner wall 81 of the second inlet 58 in the second pump casing 16b.
  • the second blockage plate 82 is located between the space formed by the outer wall 83 of the second impeller blade portion 45b on the side of the second blockage plate 82 and the inner wall 59 of the second pump casing 16b and the space at the second inlet 58. occlude the
  • the first pump casing 16a and the second pump casing 16b are connected by a connecting pipe 62 that forms a flow path for sending liquid from the first impeller 6a to the second impeller 6b.
  • the connecting pipe 62 passes through the outside of the motor frame 18 and feeds the liquid discharged from the liquid feed port 57 of the first pump casing 16a to the second inlet 58 of the second pump casing 16b.
  • part of the liquid transported by the rotation of the impellers 6a and 6b travels between the rotating shaft 2 and the bearings 3a and 3b at two points. It flows as indicated by the dashed arrow.
  • the liquid that has flowed into the first pump casing 16a from the first inlet 56 passes through the first impeller vane internal flow path 72 of the first impeller 6a by the rotational force of the first impeller 6a, and then through the connecting pipe 62. It flows from the second inlet 58 into the second pump casing 16b.
  • the liquid that has flowed into the second pump casing 16b branches into two directions. 61 to the outside of the second pump casing 16b.
  • the other branched liquid is sent into the stator can 9 through the second impeller boss portion through hole 49b of the second impeller 6b.
  • the liquid sent from the second pump casing 16b into the stator can 9 further branches into two directions.
  • One of the branched liquids passes through the second communication passage 71 provided in the second pump casing 16b and passes through the space between the stator can 9 and the rotor 12 toward the first bearing 3a.
  • the other part of the branched liquid passes between the sleeve 25 of the rotating shaft 2 and the second bearing 3b.
  • the liquid that has passed between the sleeve 25 of the rotating shaft 2 and the second bearing 3b passes between the second bearing 3b and the second bearing-supported member 4b, and flows between the stator can 9 and the rotor 12. It passes through the space toward the first bearing 3a.
  • the liquid passes between the sleeve 25 of the rotating shaft 2 and the second bearing 3b and when the liquid passes between the second bearing 3b and the second bearing-supported member 4b, the liquid mainly flows through the second bearing 3b. pass through grooves 76 and 74 formed in the .
  • the liquid that has passed through the space between the stator can 9 and the rotor 12 branches into two directions.
  • One of the liquids passes through the first communication passage 67 of the first pump casing 16a and the first impeller boss portion through-hole 49a of the first impeller boss portion 39a and enters the first impeller blade internal flow path 72 of the first impeller 6a.
  • the other liquid passes between the first bearing 3 a and the first bearing-supported member 4 a and then between the first bearing 3 a and the sleeve 25 of the rotating shaft 2 .
  • the liquid passes between the first bearing 3a and the first supported member 4a and when the liquid passes between the first bearing 3a and the sleeve 25 of the rotating shaft 2, the liquid mainly flows through the first bearing.
  • the first pump casing 16a and the connecting pipe 62 are connected via a first discharge passage 84 provided on the secondary side of the liquid feed port 57 on the top side of the first pump casing 16a. ing.
  • the first discharge flow path 84 and the connecting pipe 62 are connected by bolting flanges 86 and 87 provided at respective ends facing each other.
  • the second pump casing 16b and the connecting pipe 62 are connected via a second suction passage 88 provided on the primary side of the second inlet 58 in the second pump casing 16b.
  • the second suction flow path 88 and the connecting pipe 62 are connected by bolting flanges 89 and 91 provided at respective ends facing each other.
  • the bearings 3a and 3b are pressed against the rotor 12 of the motor section 11 by the bearing-supported members 4a and 4b.
  • an elastic reaction force is applied in the axial direction to one or both of the bearings 3a and 3b and the bearing-supported members 4a and 4b.
  • the rotating shaft 2 moves toward the first impeller 6a by the amount of play due to the pressure difference in the axial direction, and the bearings 3a, 3b and the bearing-supported members 4a, 4b press each other in the axial direction.
  • the bearings 3a, 3b and the bearing-supported members 4a, 4b press each other in the axial direction.
  • the bearings 3a, 3b And/or the bearing-supported members 4a and 4b contact each other while tilting at a small angle with respect to the axial direction so that the surfaces facing each other are in surface contact. In this manner, the bearings 3a, 3b and the bearing-supported members 4a, 4b are in surface contact, thereby preventing wear caused by the uneven contact of the bearings 3a, 3b with the bearing-supported members 4a, 4b.
  • FIG. 6 shows an example in which the elastic structure 7B is composed of an elastic body provided between the side of the bearing 3a opposite to the rotor 12 of the motor portion 11 and the casing-side bearing housing 32a.
  • 3 shows an example provided between the bearing-supported member housing 38a and the rotor 12 side of the motor section 11 of the bearing-supported member 4a.
  • the elastic body shown in the figure is a coil spring.
  • the coil spring has a diameter equal to or smaller than the radial thickness of the bearing 3a and the bearing-supported member 4a.
  • a plurality of coil springs are provided at regular intervals in the circumferential direction of each of the bearing 3a and the bearing-supported member 4a.
  • the elastic structure 7B (not shown) on the side of the second impeller 6b has a structure axially symmetrical with the elastic structure 7B on the side of the first impeller 6a with the rotor 12 as the center.
  • the elastic structure 7C shown in FIG. 8 is obtained by replacing the plurality of coil springs forming the elastic structure 7B with one coil spring in the example shown in FIG.
  • a coil spring that forms the elastic structure 7C is arranged at a position concentric with the rotating shaft 2 .
  • the coil springs shown in FIG. 8 press near the radial centers of the end surfaces of the bearings 3a and 3b and the bearing-supported members 4a and 4b.
  • FIG. 8 shows only the elastic structure 7C on the first impeller 6a side, and omits illustration of the elastic structure 7C on the second impeller 6b side.
  • the elastic structure 7C (not shown) on the side of the second impeller 6b has a structure axially symmetrical with the elastic structure 7C on the side of the first impeller 6a with the rotor 12 as the center.
  • a spring washer, a disc spring washer, a wave washer, or the like can be employed instead of the coil springs forming the elastic structures 7B and 7C.
  • FIG. 7 shows an elastic structure 7A in which a plate member 92 is provided between the side of the bearing 3a opposite to the rotor 12 of the motor section 11 and the casing-side bearing housing 32a, and the casing-side bearing housing 32a is positioned between the plate member 92 and the bearing 3a.
  • a thin metal plate such as a metal washer can be used as the plate member 92 .
  • a bearing-side gap 93 is formed between the casing-side bearing housing 32 a and the plate member 92 .
  • FIG. 7 shows only the elastic structure 7A on the first impeller 6a side.
  • the elastic structure 7A on the side of the second impeller 6b has a structure axially symmetrical with the elastic structure 7A on the side of the first impeller 6a with the rotor 12 as the center.
  • the bearing-side gap 93 is formed on one side of the inner diameter side of the plate member 92, and the outer diameter side of the plate member 92 is sandwiched between the bearings 3a, 3b and the casing-side bearing housings 32a, 32b. Since the bearing side gap 93 is formed only on one side of the inner diameter side of the plate member 92, when the bearings 3a and 3b are inclined with respect to the rotating shaft 2, the plate member 92 bends toward the bearing side gap 93 and exerts an elastic force. generate.
  • a plate member 92 is provided between the rotor 12 side of the motor portion 11 of the bearing support member 4a and the bearing support member housing 38a.
  • 38a axially supports only a portion of the surface of the plate member 92 opposite to the bearing-supported member 4a, thereby imparting an elastic reaction force to the bearing-supported member 4a in the axial direction.
  • a thin metal plate such as a metal washer can be used as the plate member 92, and a bearing-supported-member-side gap 94 is formed between the bearing-supported-member housing 38a and the plate member 92.
  • FIG. 7 shows only the elastic structure 7D on the first impeller 6a side.
  • the elastic structure 7D on the side of the second impeller 6b has a structure axially symmetrical with the elastic structure 7D on the side of the first impeller 6a with the rotor 12 as the center.
  • the bearing support member side gap 94 is formed on one side of the plate member 92 on the outer diameter side, and the inner diameter side of the plate member 92 is formed between the bearing support members 4a and 4b and the bearing support member housing 38a and 38a. 38b. Since the bearing-supported-member-side gap 94 is formed only on one side of the outer diameter side of the plate member 92, when the bearing-supported members 4a and 4b are inclined with respect to the rotation shaft 2, the plate member 92 is positioned as the bearing-supported member. It bends toward the side gap 94 to generate an elastic force.
  • FIG. 9 is a diagram showing a state in which the bearing 3a and the bearing-supported member 4a are in surface contact while being slightly inclined with respect to the rotating shaft 2. As shown in FIG. However, only the degree of bending of the plate member 92 is emphasized, and the inclination of the bearing 3a and the bearing-supported member 4a is not emphasized.
  • the bearings 3a, 3b and the bearing-supported members 4a, 4b are mutually aligned.
  • the bearings 3a, 3b and the bearing-supported members 4a, 4b tilt with respect to the axial direction, as shown in FIG.
  • the bearings 3a and 3b and the bearing-supported members 4a and 4b are brought into surface contact with each other.
  • FIG. 1 In the example shown in FIG.
  • the plate member 92 is arranged between the bearings 3a, 3b and the casing-side bearing housings 32a, 32b, between the bearing-supported members 4a, 4b and the bearing-supported member housings 38a, 38b. may be provided only in either one of the
  • the present invention can be applied to canned motor pumps, for example.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Support Of The Bearing (AREA)
  • Motor Or Generator Frames (AREA)
PCT/JP2022/016912 2021-06-04 2022-03-31 キャンドモータポンプの軸受構造 WO2022254959A1 (ja)

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KR1020237040864A KR20240004667A (ko) 2021-06-04 2022-03-31 캔드 모터 펌프의 베어링 구조
CN202280039152.5A CN117460892A (zh) 2021-06-04 2022-03-31 屏蔽电泵的轴承构造
JP2023525643A JP7525739B2 (ja) 2021-06-04 2022-03-31 キャンドモータポンプの軸受構造

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JP (1) JP7525739B2 (enrdf_load_stackoverflow)
KR (1) KR20240004667A (enrdf_load_stackoverflow)
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1169704A (ja) * 1997-08-21 1999-03-09 Asmo Co Ltd モータの軸受装置
JP2000329087A (ja) * 1999-05-20 2000-11-28 Ebara Corp キャンドモータポンプ
JP2011032923A (ja) * 2009-07-31 2011-02-17 Yamada Seisakusho Co Ltd ウォータポンプ
JP2016519244A (ja) * 2013-05-08 2016-06-30 カーエスベー・アクチエンゲゼルシャフトＫｓｂ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ すべり軸受配列を備えるポンプ装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116583672A (zh) 2020-12-15 2023-08-11 三相电机株式会社 屏蔽电泵

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1169704A (ja) * 1997-08-21 1999-03-09 Asmo Co Ltd モータの軸受装置
JP2000329087A (ja) * 1999-05-20 2000-11-28 Ebara Corp キャンドモータポンプ
JP2011032923A (ja) * 2009-07-31 2011-02-17 Yamada Seisakusho Co Ltd ウォータポンプ
JP2016519244A (ja) * 2013-05-08 2016-06-30 カーエスベー・アクチエンゲゼルシャフトＫｓｂ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ すべり軸受配列を備えるポンプ装置

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JPWO2022254959A1 (enrdf_load_stackoverflow) 2022-12-08
JP7525739B2 (ja) 2024-07-30
KR20240004667A (ko) 2024-01-11

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