WO2005043722A1 - Dispositif rotatif - Google Patents

Dispositif rotatif Download PDF

Info

Publication number
WO2005043722A1
WO2005043722A1 PCT/AU2004/001445 AU2004001445W WO2005043722A1 WO 2005043722 A1 WO2005043722 A1 WO 2005043722A1 AU 2004001445 W AU2004001445 W AU 2004001445W WO 2005043722 A1 WO2005043722 A1 WO 2005043722A1
Authority
WO
WIPO (PCT)
Prior art keywords
disk
magnet
induction
shaft
coils
Prior art date
Application number
PCT/AU2004/001445
Other languages
English (en)
Inventor
Arthur Stephen Healey
Original Assignee
Arthur Stephen Healey
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
Priority claimed from AU2003905937A external-priority patent/AU2003905937A0/en
Application filed by Arthur Stephen Healey filed Critical Arthur Stephen Healey
Publication of WO2005043722A1 publication Critical patent/WO2005043722A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos

Definitions

  • a ROTARY DEVICE Field of the Invention relates to rotary devices such as an apparatus for generating electricity or a motor .
  • the invention is particularly applicable to wind driven electric generators .
  • a typical wind driven electric generator in use today is based on the old windmill.
  • Propellers are arranged on a horizontal shaft and rotate in a vertical plane about the horizontal shaft axis .
  • the shaft is connected through gearing to an electric generator which generates electricity .
  • generators of the above design are of a large construction and are mounted high above typical terrain to capture sufficient wind to rotate the propellers .
  • the present invention provides an alternative type of apparatus for generating electricity comprising a shaft, at least one magnet disk coupled to the shaft and comprising at least one permanent magnet with its poles substantially axially aligned with the shaft, an induction means comprising at least one induction coil for generating an electric current when the magnetic field of one permanent magnet moves through it and wherein in use the shaft is adapted to rotate the or each magnet disk relative to at least one induction coil .
  • a motor having a shaft, at least one magnet disk coupled to the shaft and comprising at least one permanent magnet with its poles substantially axially aligned with the shaft, an induction means comprising at least one induction coil for generating an electric current when the magnetic field of one permanent magnet moves through it and wherein in use generation of an electric current through the induction means is adapted to rotate the or each magnet disk relative to at least one induction coil .
  • the shaft in use is aligned substantially vertically.
  • the/each magnet disk comprises a plurality of permanent magnets .
  • the permanent magnets may be arranged with alternative north and south poles around a perimeter region of the magnet disk.
  • the disk may be in the form of a flat or thin member of any particular shape .
  • the disk may be any member which has an axial width less than the maximum radial length.
  • Preferably the disk is substantially circular.
  • The/each permanent magnet may be located on at least one major face of the magnet disk.
  • the permanent magnets may be located on each major face of the magnet disk.
  • Each permanent magnet may be located in a receiver of the magnet disk.
  • the magnet disk may comprise a supporting surface for supporting each permanent magnet.
  • the magnet disk may comprise a plurality of supporting surfaces .
  • the magnet disk comprises an upper and lower disk member.
  • Each permanent magnet may be located between the upper and lower disk member . It is preferred that each permanent magnet is located between the upper and lower disk member .
  • the magnet disk may comprise a layered configuration of coaxial upper and lower disk members .
  • the magnet disk may comprise a centre disk member and upper and lower disk members .
  • permanent magnets are located between centre and lower disk members and upper and centre disk members . It is preferred that each permanent magnet is located in a predetermined region between disk members .
  • Each magnet disk may include a locater means for locating each permanent magnet with respect to a supporting surface of the magnet disk.
  • the locating means may comprise a housing with a plurality of magnet receiving sections .
  • the housing preferably comprises a disk.
  • the magnet receiving section preferably comprises enclosures .
  • the enclosures may be arranged radially around the centre of the housing.
  • the magnet receiving section comprises enclosures located inside the periphery of the housing.
  • the magnet receiving section may comprise enclosures located equispaced around an annular region of the housing .
  • Each enclosure may comprise an opening through the housing.
  • the housing may be sandwiched between upper and lower disks .
  • the housing may comprise a carrier/support.
  • the housing comprises a hub with enclosures arranged radially around the centre .
  • the enclosures may have a narrow base to prevent magnets falling through .
  • the magnets may have a lower face which is smaller than a top face and the housing may have correspondingly shaped enclosures which allow the magnets to be snugly located within the enclosures .
  • the magnet disk comprises a circular plate .
  • the magnets may be arranged radially around the centre of the disk.
  • the magnets are arranged around an annular section of the disk.
  • a plurality of magnets are located in a radial line from the magnet disk centre.
  • the magnets are located on an upper surface of the upper disk.
  • the magnets may be located on a lower surface of the lower disk.
  • the poles of each magnet are aligned perpendicular to the upper and lower surfaces of the magnet disk.
  • the magnets may be wedge shaped.
  • the magnets may be segments of an annular section of the magnet disk.
  • the apparatus comprises a plurality of induction coils.
  • the induction means may comprise a support member .
  • the support member may comprise a support disk having a plurality of induction coils .
  • the induction coils are located on an upper and or lower surface of the support member .
  • the coils may be located above/or below magnets of the magnet disk.
  • the induction means may be fixed.
  • the apparatus may comprise a frame.
  • the induction means may be connected to the frame.
  • the shaft may be supported by a bearing means .
  • the bearing means may comprise bearings at both ends of the shaft.
  • the apparatus comprises a driving means for rotating the shaft.
  • the induction means may comprise a plurality of support disks each with a plurality of induction coils thereon . At least one magnet disk may be located between two support disks .
  • Induction coils may be arranged radially around the centre of a support member .
  • Induction coils may be arranged equispaced around an annular region of the support member .
  • induction coils are arranged on the support member with their centres at substantially the same radial distance from the shaft centre as magnets on an adjacent magnet disk. It is preferred that induction coils are centred on the circumference of the circular region matching that of magnets on the adjacent magnet disk.
  • the induction means may comprise adjacent sets of induction coils on either side of one support member.
  • the induction means comprises a plurality of sets of induction coils. Each set of coils may comprise an array of equispaced induction coils coaxially arranged around a circular region .
  • the induction means comprises adjacent support members each with at least one set of induction coils .
  • each induction coil in one set has its centre offset from a coil on an adjacent support member by a phase shift of 90° induced current, i.e. the centre of a coil in one set corresponds to the mid point between coils in an adjacent set.
  • adjacent sets of coils are offset by a phase shift of 60°, i.e. the centre of one coil of a first set corresponds to a third of the distance between adjacent coils in a second set and the centre of a coil of the next set on a third member corresponds to two thirds of the distance between the adjacent coils in the first set.
  • axially adjacent sets of coils are arranged so that the centre of coils in respective sets are offset with respect to the centre of coils in a previous set.
  • sets of coils are arranged to phase shift the current in one set of coils from a previous set of coils .
  • the position of coils in respective sets of coils phase shift the current by 180° ⁇ n; where n is the number of sets of coils .
  • All support members may be coaxially located around the shaft.
  • the frame comprises a base frame and frame members for supporting the driving machines .
  • the frame members preferably support the shaft.
  • the driving means may comprise a wind turbine or water turbine .
  • the vanes of the wind or water turbine are preferably arranged around a centre coaxial with the shaft.
  • the vanes may be vertically oriented.
  • the frame comprises a cage having vertical frame supports interconnecting a top frame member and the base .
  • the driving means may be maintained on the top of the shaft .
  • the induction means and magnetic discs may be located inside the frame supports/cage of the frame.
  • Induction coils are preferably located on the base.
  • Induction coils preferably comprise hollow air coils .
  • the apparatus may include a magnetic field concentrating means .
  • the magnetic field concentrating means may comprise core members, metal members, steel, iron cores etc. Core members may each comprise a laminated central stud, It is preferred that the apparatus comprises a core support (s) for supporting core members in the induction coils .
  • the core support is preferably movable to move core members into and out of the induction coils . It is preferred that as air flow increases cores penetrate the coils to a greater extent.
  • the magnet disks may be removably connected to the shaft . According to an alternative embodiment of the invention the coil disks are mounted on the shaft so that they move with the shaft and the magnet disks are stationery and mounted to the rame . According to an alternative embodiment coil disks are able to move in an opposite direction to magnetic disks.
  • Figure 1 shows a schematic view of a wind generator according to a first embodiment of the present invention, when connected to a roof of a house;
  • Figure 2 shows an angled view of a wind generator according to a preferred embodiment of the present invention ;
  • Figure 3 shows a top view of an induction coil support disk according to a first embodiment of the present invention;
  • Figure 4 shows a top view of a permanent magnet disk support according to a second embodiment of the present invention;
  • Figure 5 shows an end view of support disks shown in Figure 4 ;
  • Figure 6 shows a schematic top view of a permanent magnet used in the embodiment shown in Figure 4;
  • Figure 7 shows a top view of a permanent magnet support disk according to a third embodiment of the present invention;
  • Figure 8 shows an angled view of the disk support shown in Figure 7 ;
  • Figure 9 shows a schematic end view of a laminated core for an induction coil according to a first embodiment of the present invention;
  • Figure 10 shows
  • the wind turbine generator 11 is shown attached to the apex of a roof 12 of a house .
  • wind would turn the blades of the wind turbine 13 and the generator would generate electricity to service the house.
  • the wind turbine generator according to the preferred embodiment consists of a wind turbine 14 with vertically oriented blades 15 arranged on a central shaft 16.
  • the wind turbine 14 is mounted to a top end of the shaft 16 above a support frame 17.
  • the support frame 17 consists of a series of vertical support bars 18 (4 in this example) extending from a circular base 18.
  • a number of permanent magnet support disks 19 are mounted to the shaft 16. Above and below these disks 19 induction coil supporting disks 20 are provided.
  • a typical disk 20 has a central circular aperture 21 through which the shaft 16 extends .
  • An outer annular region 22 is provided with a radial array of equispaced coils 23 which in the example shown extend around and inside the circumference 24 of the disk 20.
  • three radially aligned coils 23 are shown.
  • the number of coils can be varied to suit different applications . Thus for example coils could extend closer to the central hole 21. Alternatively larger coils may be provided resulting in a lower number of coils around the central hole 21.
  • Each induction coil 23 is typically a copper wound coil with a hollow centre as shown in Figure 9.
  • the coils are located on the top and bottom surfaces of the support disk 20. Typically they are axially aligned with the central shaft 16.
  • the disk 20 may be in the form of a circular metal plate.
  • the shape of the disk 20 however may be changed as in the preferred embodiment it is fixed to the support frame 17. There ore the disk could be a solid supporting structure of any particular geometric shape .
  • the main purpose of this disk is to support the coils so that the coils can be aligned with the permanent magnets on the permanent magnet supporting disks 19.
  • induction coils are arranged in sets in a layered configuration on a number of different supporting disks.
  • Each set of induction coils would be radially aligned with other sets but the position of induction coils in each set would be o fset with respect to other sets .
  • the offsetting would be designed to ensure the smoothest possible induction current as a result of the rotating magnetic field induced by the moving permanent magnets .
  • the current induced in one set of induction coils is phase shifted with respect to the induction current in each other set of induction coils. If for example there are three sets of induction coils each induction coil in one set would be offset so as to produce a phase shift in the current of 60° . The result would be induction current with a phase shift of 0°, 60° and 120°.
  • induction coils of the same type in each set a position of induction coils in one set would be ⁇ ircumferentially offset with respect to those in other sets . Therefore if there were two sets of induction coils the centre of induction coils in one set would be located in the equivalent axial position as the mid distance between the centres of two induction coils in the other set. For three sets of induction coils the induction coils in one set would be located at a position one third of the distance between two induction coils of another set and the third set would be offset so that the centre of each induction coil is positioned two thirds of the distance between one of the sets of induction coils.
  • phase shift in current for each set of induction coils is determined by 180° ⁇ n where n is the number of induction coils . It should also be noted that in other embodiments with concentric rings of induction coils on one supporting member, the location of each induction coil in a set will be dependent upon a number of factors including whether there are rings of permanent magnets on a particular adjacent magnet supporting disk. As shown in Figure 4 , Figure 5 and Figure 6 permanent magnets 25 are sandwiched between upper and lower circular steel plates 26, 27 in an alternating pattern of north and south poles around a central hub 28. The central hub 28 is made of an insulated packing material and surrounds a central circular hole 29 through which the shaft 16 is located.
  • the permanent magnets 25 have a wedge shaped configuration forming a sector of an annular region 30 formed between the circumference of the hub 28 and the circumferential edge of the disk 19.
  • the magnets 25 are arranged so that their poles are axially aligned with the central shaft 16.
  • a north pole shown from a top view of disk 19 shown in Figure 4 would have a corresponding south pole on the opposite side of the magnet 25 when the disk 19 is viewed from below .
  • the upper and lower steel plates 26, 27 are substantially identical and may be connected together by any suitable technique such as gluing, bolting etc. The size and shape of the permanent magnets may be changed to suit particular applications .
  • FIG. 7 and 8 permanent magnets 25 may be retained in a specially configured wedge shaped disk 30.
  • wedge shaped enclosures 31 are provided radially and equispaced around the annular region between the edge of the hub 32 (corresponding to hub 28) and the circumferential edge 33.
  • Each enclosure 31 increases in thickness towards the outer edge 33.
  • Wedge shaped magnets fit into the enclosures 31 and upper and lower steel plates serve to retain the magnets in the enclosures 31.
  • the walls of the enclosures 31 have a slight slope so that the magnets cannot fall through them.
  • FIG 9 shows an example of an induction coil 23 with a permanent magnet 25.
  • the induction coil 23 has its core 34 centrally aligned with the centre of the permanent magnet 25 on the supporting disk 19.
  • the bottom of the induction coil 23 is very close to the upper steel plate surface 26 so that the magnetic field lines of the permanent magnetic 25 are concentrated within the core of the induction coil 23.
  • the magnetic field within the induction coil 23 may be further concentrated by using a laminated steel core/pin 35. The further the pin 35 is inserted in the core 34 the greater the current induced in the induction coil as a result of the moving magnetic field created by the rotating disk 19.
  • one disk 19 is located between two induction coil support disks 20.
  • the induction coils of one supporting disk 20 are aligned so that their centres are aligned with the centre of magnets having poles of one polarity (for example north poles)
  • induction coils on a supporting disk 20 on the opposite side of the disk 19 have their central cores aligned with the centre of the south poles of the permanent magnets . Therefore looking at Figure 4 an induction coil above disk 19 would be configured so that it could centre for maximum induction above every north pole with its edges extending to a mid point of the south pole magnets next to the north pole magnets.
  • induction coils On the opposite side of the disk 19 however the induction coils would be centred underneath the south pole magnets (when viewed from above) which are in fact the north pole side of the magnets showing their south pole when viewed from above. Therefore in this embodiment induction coils have a diameter which is approximately twice the mid point width of each permanent magnet, i.e. the width across a permanent magnet starting at a point midway along the radial length. Induction coils may be mounted on a series of supporting disks/plates in a layered configuration to maximise the number of coils which are affected by the moving magnetic field of the rotating magnets 25 on disks 19. Obviously however the further the induction coils are from the permanent magnets, the weaker the magnetic field passing through their cores .
  • induction coils are located on the upper surface of the base 18 and on the lower surface of the uppermost disk 20. This uppermost disk 20 separates the electrical generation part of the generator f om the wind turbine blades 15.
  • FIG. 10 shows one embodiment in which pins 40 are able to be controlled to move in and out of cores 41 of coils 42.
  • vertical control rods 43, 44 can be moved up or down by operation of control motors 45, 46 located at the bottom of the generator 47.
  • Each of the pins 40 is connected to the control rods 43, 44 by horizontal upper and lower support arms 48, 49.
  • Such a disk may be controlled to move up or down so that all the pins move up and down at the same time .
  • a gearing arrangement may be used to move pins up and down as vertical rods similar to those described in Figure 10 are moved up and down.
  • no gearing is necessary for the wind turbine generator as disks can be stacked one above the other until the energy requirement has been met.
  • stacked disks can act as flywheels so the absorbed energy keeps them rotating at a constant speed compensating for variable air movement. In a large configuration the disks can rotate slowly but the peripheral speed in such a situation would be more considerable.
  • the electrical output is increase as does the number of coils of a set size.
  • the induction coils are attached to a laminated central stud that retains a mild steel laminated washer or base plate the same size as the coil,.
  • the stud penetrates into the coil to a midway point.
  • This arrangement increases the voltage delivered by the coils without adding drag which would otherwise impede the rotating disks retaining the magnets .
  • the coils may be mounted on a mild steel laminated platform in order to avoid hysteresis problems inherent with magnetic coils .
  • the metal studs or pins may also be replaced with material other than steel.
  • the many copper coils making up the fixed plates may be replaced with a single large one residing around the central axis. In this case spiked steel disks remain fixed above rotating magnetic plates directing the magnetic forces to the copper coil .
  • permanent magnets are retained in non magnetic material having a high dielectric constant, such as Bakelite. In addition these may be sealed with stainless steel plates top and bottom.
  • a battery may or may not be used to drive the magnetic plates if the EMF they can deliver does not exceed the required input energy needed for the motor .
  • Attached to the central shaft is a one-way bearing that disconnects automatically when the turbine has sufficient wind to move the plates at their rated RP .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

L'invention concerne un générateur comprenant un arbre (16), une pluralité de disques magnétiques (19) couplés à l'arbre, chaque disque de la pluralité de disques présentant une pluralité d'aimants permanents à pôle (25) négatif et positif alternant, l'axe des pôles étant sensiblement aligné avec l'arbre, un stator (20) présentant une pluralité de bobines d'induction centrées sur la circonférence d'une région circulaire (22) correspondant aux aimants permanents, positionnés sur un disque magnétique adjacent, de sorte que, lorsque les disques magnétiques permanents tournent sous l'action du courant produit dans la bobine d'induction, des éléments noyaux (35) insérés dans les bobines d'induction concentrent le champs magnétique, et des moyens de commande (45) commandent le mouvement des éléments noyaux.
PCT/AU2004/001445 2003-10-24 2004-10-21 Dispositif rotatif WO2005043722A1 (fr)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
AU2003905937 2003-10-24
AU2003905937A AU2003905937A0 (en) 2003-10-24 Improvement in permanent magnet generators
AU2004900580A AU2004900580A0 (en) 2004-02-09 Improvement in permanent magnet generators
AU2004900580 2004-02-09
AU2004901721A AU2004901721A0 (en) 2004-04-01 Improvements in permanent magnet generators
AU2004901721 2004-04-01
AU2004904690 2004-08-19
AU2004904690A AU2004904690A0 (en) 2004-08-19 Improvement in permanent magnet generators

Publications (1)

Publication Number Publication Date
WO2005043722A1 true WO2005043722A1 (fr) 2005-05-12

Family

ID=34557439

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU2004/001445 WO2005043722A1 (fr) 2003-10-24 2004-10-21 Dispositif rotatif

Country Status (1)

Country Link
WO (1) WO2005043722A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009126850A1 (fr) * 2008-04-11 2009-10-15 The Timken Company Chauffage par induction utilisant des aimants permanents pour durcir les dents d'un engrenage et autres composants similaires
US8993942B2 (en) 2010-10-11 2015-03-31 The Timken Company Apparatus for induction hardening
WO2016054052A1 (fr) * 2014-09-30 2016-04-07 Raeen Bahram Génératrice électrique
WO2018147884A1 (fr) * 2017-02-13 2018-08-16 Raeen Bahram Dispositif électrique
CN115450260A (zh) * 2022-10-24 2022-12-09 广西珠委南宁勘测设计院有限公司 一种防洪排涝泵站的抽排机组钢盖板组件及吊装方法
US11811264B1 (en) 2014-09-30 2023-11-07 Raeentek Llc Electric device

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29716116U1 (de) * 1997-09-08 1997-11-20 Berg Hans Joachim Elektrische Maschine
JPH1023697A (ja) * 1996-06-28 1998-01-23 Sawafuji Electric Co Ltd 回転電機のステータコイル
JPH10271784A (ja) * 1997-03-21 1998-10-09 Fuji Electric Co Ltd 軸方向空隙形永久磁石励磁同期機
WO2000048294A1 (fr) * 1999-02-12 2000-08-17 Helmut Schiller Machine electrique
WO2001006623A1 (fr) * 1999-04-23 2001-01-25 Aerpac Holding B.V. Generateur
GB2360140A (en) * 1999-12-20 2001-09-12 Ford Global Tech Inc Permanent magnet hybrid machine with controllable flux
WO2001084695A1 (fr) * 2000-04-28 2001-11-08 Genius Ingenieur-Gesellschaft Mbh Machine electrique pourvue de rotors en forme de disque
JP2004023979A (ja) * 2002-06-20 2004-01-22 Mitsumi Electric Co Ltd 車載用発電装置
WO2004057738A1 (fr) * 2002-12-20 2004-07-08 Jannali Holdings Pty Ltd Moteur ou generateur electrique a bobineuses de mandrins a air, segmente de maniere modulaire

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1023697A (ja) * 1996-06-28 1998-01-23 Sawafuji Electric Co Ltd 回転電機のステータコイル
JPH10271784A (ja) * 1997-03-21 1998-10-09 Fuji Electric Co Ltd 軸方向空隙形永久磁石励磁同期機
DE29716116U1 (de) * 1997-09-08 1997-11-20 Berg Hans Joachim Elektrische Maschine
WO2000048294A1 (fr) * 1999-02-12 2000-08-17 Helmut Schiller Machine electrique
WO2001006623A1 (fr) * 1999-04-23 2001-01-25 Aerpac Holding B.V. Generateur
GB2360140A (en) * 1999-12-20 2001-09-12 Ford Global Tech Inc Permanent magnet hybrid machine with controllable flux
WO2001084695A1 (fr) * 2000-04-28 2001-11-08 Genius Ingenieur-Gesellschaft Mbh Machine electrique pourvue de rotors en forme de disque
JP2004023979A (ja) * 2002-06-20 2004-01-22 Mitsumi Electric Co Ltd 車載用発電装置
WO2004057738A1 (fr) * 2002-12-20 2004-07-08 Jannali Holdings Pty Ltd Moteur ou generateur electrique a bobineuses de mandrins a air, segmente de maniere modulaire

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009126850A1 (fr) * 2008-04-11 2009-10-15 The Timken Company Chauffage par induction utilisant des aimants permanents pour durcir les dents d'un engrenage et autres composants similaires
US9169529B2 (en) 2008-04-11 2015-10-27 The Timken Company Inductive heating for hardening of gear teeth and components alike
US8993942B2 (en) 2010-10-11 2015-03-31 The Timken Company Apparatus for induction hardening
US9920392B2 (en) 2010-10-11 2018-03-20 The Timken Company Apparatus for induction hardening
WO2016054052A1 (fr) * 2014-09-30 2016-04-07 Raeen Bahram Génératrice électrique
RU2752698C2 (ru) * 2014-09-30 2021-07-30 Бахрам РАИН Электрическое устройство
IL250602B (en) * 2014-09-30 2022-07-01 Raeen Bahram Electric generator
AU2019279969B2 (en) * 2014-09-30 2023-04-20 Bahram RAEEN Electric Device
US11811264B1 (en) 2014-09-30 2023-11-07 Raeentek Llc Electric device
WO2018147884A1 (fr) * 2017-02-13 2018-08-16 Raeen Bahram Dispositif électrique
CN115450260A (zh) * 2022-10-24 2022-12-09 广西珠委南宁勘测设计院有限公司 一种防洪排涝泵站的抽排机组钢盖板组件及吊装方法
CN115450260B (zh) * 2022-10-24 2024-05-07 广西珠委南宁勘测设计院有限公司 一种防洪排涝泵站的抽排机组钢盖板组件及吊装方法

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