EP3732771A1 - Method for repairing solder joint leakages - Google Patents
Method for repairing solder joint leakagesInfo
- Publication number
- EP3732771A1 EP3732771A1 EP19704222.9A EP19704222A EP3732771A1 EP 3732771 A1 EP3732771 A1 EP 3732771A1 EP 19704222 A EP19704222 A EP 19704222A EP 3732771 A1 EP3732771 A1 EP 3732771A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- receiving body
- rod receiving
- spacers
- cooling water
- metallic
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/0006—Disassembling, repairing or modifying dynamo-electric machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/0056—Manufacturing winding connections
- H02K15/0068—Connecting winding sections; Forming leads; Connecting leads to terminals
- H02K15/0081—Connecting winding sections; Forming leads; Connecting leads to terminals for form-wound windings
- H02K15/0093—Manufacturing or repairing cooling fluid boxes, i.e. terminals of fluid cooled windings ensuring both electrical and fluid connection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
Definitions
- the present invention relates to a method for Repara structure of solder leaks on a connecting device which is adapted to initiate cooling water in hollow metallic stator bars of a stator winding of a rule electrical machine, said connecting device comprising: a metallic rod receiving body having a through hole into which the stator bars inserted, aligned using metallic spacers and using a solder with the rod receiving body and with the spacers cohesively and fluid-tight ver prevented, the free ends of the stator rods in essence we conclude flush with the free ends of the spacers and with an end face of the rod receiving body, a cup-shaped metallic cover member, the bordering the free ends of the stator rods cohesively and fluid-tight verbun with the rod receiving body to form adewasserkam is the, and one on the cover vorgesehe NEN, fluidly connected to the cooling water chamber me-metallic cooling water line connection.
- Connecting devices of the type mentioned are known in the art. They are used for example in Ge generators to initiate cooling water in the hollow fancy th stator rods of a stator winding.
- An example of such a generator is the generator type SGEN5-3000W from Siemens AG.
- the rod-receiving body provided with a through-hole may, for example, be made of copper and be provided in the form of a square tube.
- the free Endbe rich the stator winding leading to the stator rods are inserted into the through hole of the rod receiving body and aligned within the opening using metallic Dis dance pieces, which are also preferably made of copper.
- the stand rods, the spacers as well the rod receiving body are connected together to produce a monolithic rule unit using a Lots cohesively and fluid-tight, so that cooling water can gelan only by the hollow stator rods from one end face of the rod receiving body to the other end face.
- the cohesive solder joint is normally prepared by the components of the surfaces to be joined Kom covered with a solder and soldered by appropriate direction from in a suitable soldering device by induction.
- a cup-shaped metallic cover is placed, which may also be made of copper. The cover engages the free ends of the spacers and is cohesively and fluid-tightly connected to the Stabaufnah me redesign to form a cooling water chamber.
- a fluidly connected to thedewas serhunt metallicdeberg effetsan circuit is provided, which is fluidly connected to a cooling water reservoir. Accordingly, cooling water during the operation of the generator via thedewasser effetsan circuit can be introduced into the cooling water chamber and from there into the individual stand rods, so that they undergo cooling.
- connection device A problem of the above-described construction of the connection device is in practice that the tightness of the stator bars, the spacers and the rod receiving body cohesively interconnecting solder joints can subside, resulting in undesirable coolant leakages.
- the cause of the decreasing tightness is usually that, starting from existing in the solder joints columns that can arise during the manufacturing process of the connection device, cracks are induced in particular due to crevice corrosion and spread.
- liquid resin is applied to the end face of the rod receiving body opposite the cover element.
- a vacuum in the cooling water chamber he witnesses, which causes the resin penetrates into those cracks, the horrre bridges continuously from the cooling water chamber to the outer end face of the rod receiving body, whereby a seal is achieved.
- the present invention provides a method of the type mentioned above, comprising the steps of: a) removing the cover from the rod receiving body, b) welding all accessible by removing the cover solder joints, which the stator bars, the spacers and the Staff receiving body cohesively connect to each other, and c) cohesive and fluid-tight fastening of the removed in step a) or a new cover member on the rod receiving body.
- the present invention proposes to seal all solder joints, which are already cause for leaks or at which future leaks may occur, by over-welding with an additional material. In this way, a leak-free operation of the electric machine, which is in particular a generator, at least until the next maintenance interval be guaranteed.
- the solder joints to be over-welded are cleaned prior to performing step b).
- the cleaning can be carried out in particular in the context of a grinding process and / or using suitable cleaning agents. This improves the quality of the welding process carried out in step b).
- a laser welding method with filler metal is preferably used.
- the laser welding process is characterized on the one hand by the fact that very fine weld beads can be produced. In this way it can be ensured that the openings of the hollowed-out stator bars do not become clogged with welding filler metals.
- the laser welding method is advantageous in that only a small amount of heat is introduced into the component to be welded. Accordingly, it can be prevented that thermally be connected to the rod receiving body connected components of the electric machine be impaired, such as insulation, which give the emerging from the rod receiving body stator bars to.
- the weld beads extending in the transition region between uprights and spacers have a maximum width of 3 mm.
- Figure 1 is a schematic, partially sectioned view of a connecting device
- Figure 2 is a view of a rod receiving body in the United connecting device in the direction of arrow II in Figure 1;
- Figure 3 is a view of the arrangement shown in Figure 1 after performing a first step of a method according to an embodiment of the vorlie invention vorlie;
- Figure 4 is a view of the rod receiving body in the direction of arrow IV in Figure 3 after performing a second method step
- Figure 5 is a schematic, partially sectioned view of the connecting device after performing a final method step.
- the connecting device 1 comprises a metalli rule, preferably made of copper rod receiving body 5 with a through hole 6, which in the present case has a rectangular cross-section.
- the end portions of the stator winding 3 leading to the stator bars 2 are inserted and using metallic, also made of copper and rod-shaped fancy th spacers 7 arranged and aligned such that the free ends of the stator bars 2 substantially flush with the free ends of the spacers 7 and an end face 8 of the rod receiving body 5 complete.
- the stand rods 2, the spacers 7 and the rod receiving body 5 are connected using a Lots cohesively and fluid-tight with each other, the resulting soldering are denoted by the reference numeral 9. Accordingly, a fluid can basically penetrate the rod receiving body 5 only through the cavities of the stator rods 2.
- the connecting device 1 further comprises a cup-shaped me tallisches cover 10, which is also preferably made of copper fer.
- the cover 10 is so out forms and cohesively and fluid-tight with the Stabauf receiving body 5 connected to it, the free ends of the Stän derstäbe 2 and the spacers 7 to form a cooling water chamber 11 surrounds.
- a presently made of stainless steelmébaum Arthursan circuit 12 is provided, which is fluidly connected to the cooling water chamber 11 and leads to a not dargestell th cooling water reservoir or is connected to a cooling water circuit running. Accordingly, cooling water can be supplied via the cooling water port 11 of the cooling water chamber 10 and introduced into the respective stator bars 2 to cool the stator winding 3.
- the cover 10 is removed from the rod receiving body 5, as shown in Figure 3, for example by means of soldering. Subsequently, the By removing the cover 10 accessible solder joints 9 preferably cleaned, including a grinding process and / or suitable cleaning agents can be used or can.
- all solder are set 9, which the stator rods 2, the spacers 7 and the rod receiving body 5 cohesively with each other, the over-welded.
- the welding beads 13 formed as part of this welding process are shown in FIG. 4, which should have a width B of not more than 3 mm in the transitional region between the upright rods 2 and the spacers 7.
- the laser welding method with a suitable filler metal is used as the welding method.
- the cover element 10 removed in the first step is fastened to the rod receiving body by means of a material fit and fluid-tight again, in particular soldered thereto, as shown in FIG. Beforehand, the cover 10 can be cleaned and / or repaired, should this be necessary. Alternatively, the cover 10 may also be replaced by a new cover.
- the method described above is particularly advantageous in that, in addition to the elimination of already existing leaks in the area of the solder joints 9, the emergence of new leaks can be prevented, at least until the next maintenance cycle.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018202601.7A DE102018202601A1 (en) | 2018-02-21 | 2018-02-21 | Method for repairing soldering leaks |
PCT/EP2019/051770 WO2019162036A1 (en) | 2018-02-21 | 2019-01-24 | Method for repairing solder joint leakages |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3732771A1 true EP3732771A1 (en) | 2020-11-04 |
Family
ID=65363236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19704222.9A Pending EP3732771A1 (en) | 2018-02-21 | 2019-01-24 | Method for repairing solder joint leakages |
Country Status (4)
Country | Link |
---|---|
US (1) | US20210044183A1 (en) |
EP (1) | EP3732771A1 (en) |
DE (1) | DE102018202601A1 (en) |
WO (1) | WO2019162036A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111697770B (en) * | 2020-06-08 | 2021-07-06 | 明阳智慧能源集团股份公司 | Method for repairing broken tower of cooling water pipe of semi-direct-drive permanent magnet synchronous wind driven generator |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4730669A (en) * | 1986-02-03 | 1988-03-15 | Long Manufacturing Ltd. | Heat exchanger core construction utilizing a diamond-shaped tube-to-header joint configuration |
US5659944A (en) * | 1995-01-26 | 1997-08-26 | Asea Brown Boveri Ag | Method for repairing a connecting device for the electrical connection and for supplying and carrying away the coolant to and from the hollow conductor elements of the stator winding bars of electrical machines |
FR2736769B1 (en) * | 1995-07-13 | 1997-10-10 | Jeumont Ind | METHOD FOR REPAIRING A COOLING FLUID BOX OF A STATOR BAR OF AN ELECTRICAL ALTERNATOR |
US5760371A (en) * | 1995-12-08 | 1998-06-02 | Westinghouse Electric Corporation | Water-cooled stator coil header repair process |
FR2743215B1 (en) * | 1995-12-27 | 1998-02-13 | Electricite De France | METHOD AND DEVICE FOR RESTORING THE SEALING OF CONNECTING ORGANS SUCH AS WATER BOXES OF MIXED WATER-HYDROGEN COOLING GENERATORS |
EP1524754A1 (en) * | 2003-10-13 | 2005-04-20 | ALSTOM Technology Ltd | Method of repairing water-cooled stator windings in generators |
EP2054994A1 (en) * | 2006-08-03 | 2009-05-06 | Ansaldo Energia S.P.A. | Method and device for repairing the liquid-cooled electrical windings of the stator of an electric generator |
EP2453030A1 (en) * | 2010-11-08 | 2012-05-16 | United Technologies Corporation | A method for repairing/refurbishing/creating a turbine engine component |
-
2018
- 2018-02-21 DE DE102018202601.7A patent/DE102018202601A1/en not_active Withdrawn
-
2019
- 2019-01-24 US US16/968,579 patent/US20210044183A1/en not_active Abandoned
- 2019-01-24 WO PCT/EP2019/051770 patent/WO2019162036A1/en unknown
- 2019-01-24 EP EP19704222.9A patent/EP3732771A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
US20210044183A1 (en) | 2021-02-11 |
DE102018202601A1 (en) | 2019-08-22 |
WO2019162036A1 (en) | 2019-08-29 |
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Legal Events
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17P | Request for examination filed |
Effective date: 20200727 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
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Extension state: BA ME |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS ENERGY GLOBAL GMBH & CO. KG |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KRETSCHMER, MICHAEL Inventor name: WEIDNER, JUERGEN Inventor name: HOEHNER, RENE Inventor name: KOCH, ROBERT Inventor name: NALASKO, MARKUS Inventor name: FRERICHS, DETLEF Inventor name: WUNDERLICH, KLAUS Inventor name: BLACHNY, SEBASTIAN |
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DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
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17Q | First examination report despatched |
Effective date: 20220323 |