CN204253289U - A kind of straight drive blower with lightning protected function - Google Patents
A kind of straight drive blower with lightning protected function Download PDFInfo
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- CN204253289U CN204253289U CN201420688522.0U CN201420688522U CN204253289U CN 204253289 U CN204253289 U CN 204253289U CN 201420688522 U CN201420688522 U CN 201420688522U CN 204253289 U CN204253289 U CN 204253289U
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- wheel hub
- blade
- spark gap
- conduction rack
- conductor
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Abstract
The utility model discloses a kind of straight drive blower with lightning protected function; comprise wind wheel, generator, mainframe and tower cylinder; described wind wheel is connected to form by pitch variable bearings by blade and wheel hub, installs the conduction rack be made up of many rod-shaped conductors around described wheel hub.Electrical grounding structure is had on rear side of wheel hub, and static relative to wheel hub spin axis.There is spark gap between conductor ends and root of blade conductive hoop in conduction rack, between conduction rack and electrical grounding structure, there is spark gap.The utility model, by setting up spark gap relatively rotating between conductor, forms the lightning current path with relative lowest impedance, effectively avoids bearing everywhere, adequately protect to it.Conduction rack of the present utility model directly can be received the lightning current that hits wheel hub and import the earth by above-mentioned path, effectively protects each parts in wheel hub.
Description
Technical field
The utility model relates to large-scale direct wind-driven generator, particularly relates to a kind of straight drive blower with lightning protected function.
Background technique
Along with wind-driven generator enters the MW class epoch, the setting height(from bottom) of blower fan is also increasing.Thunder and lightning moment huge energy is enough to destroy some critical pieces of blower fan, and thunderbolt has become one of fan safe operation and threatened greatly.Therefore, when fan design, lightning Protection Design is very important one side.At present, the lightening arresting method of existing maturation is normally: the arrester utilizing blade, by lightning current by metal parts such as individual conductor guiding pitch variable bearings and wheel hub etc., then rely on wheel hub, main shaft, frame, tower cylinder and everywhere bearing assembling contact relation formed conductive path, until import the earth.So, electric current can flow through vitals such as driftage pitch variable bearings and main bearing etc., can cause calcination spot corrosion equivalent damage in various degree unavoidably.In addition, can damage parts such as generator amatures for lightning current, there now have been and will hit the thunder and lightning diversion generator of blade and the method directly importing tower cylinder, but for the thunder and lightning hit on wheel hub, because wheel hub is connected with rotor electrical, still can threaten to generator.
Summary of the invention
For solving the problems referred to above of prior art, the utility model will design and a kind ofly be intended to make the lightning current hitting blade and wheel hub avoid main bearings, wheel hub and the generator straight drive blower with lightning protected function as vitals such as rotors.
For achieving the above object; the technical solution of the utility model is as follows: a kind of straight drive blower with lightning protected function; comprise wind wheel, generator, mainframe and tower cylinder; described wind wheel is connected to form by pitch variable bearings by blade and wheel hub; the rotor of described generator is connected with wheel hub; and be connected with main shaft by main bearing, described main shaft is arranged on mainframe, then is connected with tower cylinder by driftage bearing.The conduction rack be made up of many rod-shaped conductors is installed around described wheel hub.Electrical grounding structure is had on rear side of wheel hub, and static relative to wheel hub spin axis.There is spark gap between some conductor and root of blade conductive hoop in conduction rack, between conduction rack and electrical grounding structure, also there is spark gap.
The main body of described blade is made up of nonconducting nonmetallic material, is connected on wheel hub by pitch variable bearings; In the position near blade tip, at least one place electric conductor being set as connecing thunder unit, receiving the lightning current hitting blade; At blade, conductive hoop is set near wheel hub; Connect thunder unit to be electrically connected by lead-in wire and conductive hoop under blade.
Described conduction rack is mutually intersected by a series of rod-shaped conductors and is electrically connected and forms the net rack shaped structure of envelope wheel hub.Conduction rack and wheel hub keep at a certain distance away, and prevent from producing electric arc between wheel hub.Some conductor and the conductive hoop of conduction rack are electrically connected by spark gap, and some conductor of the conduction rack on rear side of wheel hub is electrically connected by spark gap and ground structure.
Described mainframe and tower cylinder are set up by the spark gap under mainframe between lead-in wire and tower cylinder and are electrically connected.
Ground structure on rear side of wheel hub described in the utility model is electrical grounding structure, and described electrical grounding structure is the frame of generator.
Described in the utility modelly connect one section of blade that thunder unit is special arrester, metal empiecement or metal material.
Rod-shaped conductors described in the utility model comprises wire, metallic rod or metal bar.
Working principle of the present utility model is as follows: by above-mentioned measure, just establishes the lightning current path of the ground structure → mainframe → tower cylinder → the earth on rear side of the conductive hoop → conduction rack → wheel hub near the nearly hub end of blade conducting end → blade.
When blade is struck by lightning, lightning current enters from blade current-carrying part, pass on the conductive hoop near blade root through lower lead-in wire, spark gap through between conductive hoop and conduction rack imports into and conducts electricity on rack, then be delivered on ground structure by spark gap again, lightning current on ground structure is delivered on tower cylinder after mainframe, finally imports the earth.
The utility model has following beneficial effect:
1, the utility model is by setting up spark gap relatively rotating between conductor, forms the lightning current path with relative lowest impedance, effectively avoids bearing everywhere, adequately protect to it.
2, conduction rack of the present utility model directly can be received the lightning current that hits wheel hub and import the earth by above-mentioned path, effectively protects each parts in wheel hub.
3, ground structure on rear side of wheel hub of the present utility model, refers generally to generator housing.Lightning current can produce Skin effect on conduction rack and generator housing, and being that one is effective to wheel hub and generator parts like this protects.
Accompanying drawing explanation
The utility model has 2, accompanying drawing, wherein:
Fig. 1 is straight drive blower lightning conductor system sketch.
Fig. 2 is the partial enlarged drawing of Fig. 1, in order to represent the spark gap of conduction rack.
In figure: 10, wind wheel, 11, blade, 12, wheel hub, 13, cowling, 21, rotor, 22, stator, 23, main bearing, 24, main shaft, 25, housing, 30, mainframe, 31, driftage bearing, 32, go between under mainframe, 40, tower cylinder, 51, go between under blade, 52, conductive hoop, 60, rack is conducted electricity, 61, conductor A, 62, conductor B, 63, conductor C, 64, conductor D, 65, conductor E, 66, conductor F, 71, spark gap A, 72, spark gap B, 73, spark gap C, 74, spark gap D, 75, spark gap E.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further.As shown in Figure 1, blade 11 is arranged on wheel hub 12, adds cowling 13, composition wind wheel 10.Each blade 11 can rotate around root center.Wheel hub 12 connects generator amature 21, and rotor 21 is connected on main shaft 24 by main bearing 23.During blower fan running, wind wheel 10 and rotor 21 can rotate around main-shaft axis, and main shaft 24 is fixedly connected with mainframe 30 with generator unit stator 22 and generator housing 25, geo-stationary.Mainframe 30 is arranged on tower cylinder 40 by driftage bearing 31.
The function of blade 11 conducting end is by the lightning current guiding conduction rack 60 on blade 11.Each blade 11 major part is made up of non-conducting material, but in blade 11 upper end, has at least one place and connect thunder unit.Each thunder unit that connects is electrically connected by lead-in wire 51 under blade and conduction rack 60.Under blade, lead-in wire 51 should be placed in blade 11 cavity, to be protected.
Blade 11 can do and become oar and rotate by relativeatoeterahub 12, when becoming oar scope and being larger, considers to turn round cable impact, go between under blade 51 just can not with conduct electricity rack 60 and directly connect.Blade root position arranges conductive hoop 52 for this reason, connects thunder unit and is connected with conductive hoop 52 by lead-in wire 51 under blade.51 preformed holes that can pass blade 11 non-conductive end that go between under blade be connected with conductive hoop.Conductive hoop 52 is electrically connected by one or more spark gap and conduction rack 60.
Conduction rack 60 can not only accept blade 11 and lead thunder unit and pass the lightning current of coming, and can also directly receive the lightning current hit around wheel hub 12, and be conducted to generator ground structure, avoid wheel hub 12 and rotor 21.Conduction rack 60 is made up of a series of rod-shaped conductors of mutually intersecting around wheel hub 12 and be electrically connected.These rod-shaped conductors can be the forms such as line, bar and the bar conducted electricity.Except wheel hub 12 and the junction surface of rotor 21, wheel hub 12 is surrounded by conduction rack 60 substantially, and is not less than 100mm with wheel hub 12 standoff distance, to prevent from producing electric discharge between the two.
Consider that becoming oar rotates, the conductor D64 in conduction rack 60 around conductive hoop 52 1 weeks, and has with it certain radial clearance as spark gap A71, as shown in Figure 2.Consider the rotation of wind wheel, conductor E65 is also arranged on rear side of wheel hub 12 in the form of a ring, close to generator housing 25, and leaves complete cycle spark gap B72.Conductor D64 and the conductor E65 object done circlewise are when blade 11 or wind wheel rotate, ring-shaped conductor can produce complete cycle continuous print spark gap, when factors such as having alignment error causes spark gap size inequality, a place that can make lightning current that impedance can be found minimum or several places spark gap are as path.
On front side of wheel hub 12, end and the conductor D64 of rod-shaped conductors A61 overlap, and have spark gap C73 with conductive hoop 52.On rear side of wheel hub 12, conductor C63 one end also overlaps with conductor D64 and leaves spark gap C73 with conductive hoop 52, and the other end and ring shaped conductor E65 overlap, and leaves spark gap D74 with generator housing 25.In conduction rack 60, an above-mentioned conductive path connected into by conductor A61, conductor C63, conductor D64 and conductor E65 should be set for every part blade 11, to be imported in conduction rack 60 by the lightning current of every part blade 11.
Meanwhile, be only be not enough to be called " rack " with several above-mentioned paths of blade 11 correspondence.If above-mentioned path is called " warp " of rack, so still need around wheel hub 12 to arrange more " warp ".As conductor B62 in this example, one end is connected at A place or its elsewhere with conductor A61, and the other end can be directly connected on ring shaped conductor E65.In addition, several conductors also should be set and do " parallel ", as the conductor F66 in figure.Conductor F66 mutually intersects with conductor A61, conductor B62 and is connected, and forms grid structure, provides many paths, when lightning current passes through, the minimum path of relative impedances can be selected to flow through.The quantity of conductor should be abundant, to form closeer rack, protects fully wheel hub 12.
Conduction rack 60 can be installed or be integrated in inside the cowling 13 of non-conductive material, and this is not difficult to accomplish in design and installation.Spark gap should be as far as possible little everywhere, to reduce impedance.The end conductor forming spark gap should try one's best into comparatively sharp shape, to help generation electric discharge.
Conduction rack 60 is electrically connected by spark gap and generator housing 25.Housing 25 is connected with mainframe 30, and mainframe 30, by go between under mainframe 32 and spark gap E75, is electrically connected with tower cylinder 40.Due to the Skin effect of electric current, lightning current can distribute and conduct on conduction rack 60 and housing 25, can not flow to the parts such as wheel hub 12 and generator rotor 21.Like this, no matter whether are wheel hub 12 and rotor 21 ground connection, and lightning current all can not damage it.
To sum up; the utility model devises a kind of straight drive blower with lightning conductor system; when blade 11 or wheel hub 12 are struck by lightning; lightning current all can be received by conduction rack 60; generator housing 25 is passed to by the low impedance path comprising spark gap; then through mainframe 30, then tower cylinder 40 is passed to by spark gap.Once lightning current passes to tower cylinder 40, will be connected with the earth and import the earth, thus protect the parts such as main bearings, wheel hub 12 and the generator amature 21 on blower fan from thunderbolt destruction.
Claims (4)
1. one kind has the straight drive blower of lightning protected function, comprise wind wheel (10), generator, mainframe (30) and tower cylinder (40), described wind wheel (10) is connected to form by pitch variable bearings by blade (11) and wheel hub (12), the rotor (21) of described generator is connected with wheel hub (12), and be connected with main shaft (24) by main bearing (23), described main shaft (24) is arranged on mainframe (30), then is connected with tower cylinder (40) by driftage bearing (31);
It is characterized in that: the conduction rack (60) be made up of many conductors is installed around described wheel hub (12); Wheel hub (12) rear side has electrical grounding structure, and static relative to wheel hub (12) spin axis; There is spark gap between conductor ends and the conductive hoop (52) of blade (11) root in conduction rack (60), between conduction rack (60) and electrical grounding structure, there is spark gap;
The main body of described blade (11) is made up of nonconducting nonmetallic material, is connected on wheel hub (12) by pitch variable bearings; In the position near blade (11) blade tip, at least one place electric conductor being set as connecing thunder unit, receiving the lightning current hitting blade (11); At blade (11), conductive hoop (52) is set near wheel hub (12) place; Connect thunder unit to be electrically connected with conductive hoop (52) by go between under blade (51);
Described conduction rack (60) is mutually intersected by a series of rod-shaped conductors and is electrically connected and forms the net rack shaped structure of envelope wheel hub (12); Conduction rack (60) and wheel hub (12) keep at a certain distance away, and prevent from producing electric arc between wheel hub (12); Some conductor and the conductive hoop (52) of conduction rack (60) are electrically connected by spark gap, and some conductor of the conduction rack (60) of wheel hub (12) rear side is electrically connected by spark gap and ground structure;
Described mainframe (30) and tower cylinder (40) are set up by the spark gap under mainframe between lead-in wire (32) and tower cylinder (40) and are electrically connected.
2. a kind of straight drive blower with lightning protected function according to claim 1; it is characterized in that: the ground structure of described wheel hub (12) rear side is electrical grounding structure, and described electrical grounding structure is the frame (25) of generator.
3. a kind of straight drive blower with lightning protected function according to claim 1, is characterized in that: described connects one section of blade that thunder unit is special arrester, metal empiecement or metal material.
4. a kind of straight drive blower with lightning protected function according to claim 1, is characterized in that: described rod-shaped conductors comprises wire, metallic rod or metal bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420688522.0U CN204253289U (en) | 2014-11-17 | 2014-11-17 | A kind of straight drive blower with lightning protected function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420688522.0U CN204253289U (en) | 2014-11-17 | 2014-11-17 | A kind of straight drive blower with lightning protected function |
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| CN204253289U true CN204253289U (en) | 2015-04-08 |
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| CN201420688522.0U Active CN204253289U (en) | 2014-11-17 | 2014-11-17 | A kind of straight drive blower with lightning protected function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104405594A (en) * | 2014-11-17 | 2015-03-11 | 中国第一重型机械股份公司 | Direct-driven fan with lightning protection function |
| CN110953128A (en) * | 2018-09-27 | 2020-04-03 | 西门子歌美飒可再生能源公司 | Wind turbine |
-
2014
- 2014-11-17 CN CN201420688522.0U patent/CN204253289U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104405594A (en) * | 2014-11-17 | 2015-03-11 | 中国第一重型机械股份公司 | Direct-driven fan with lightning protection function |
| CN110953128A (en) * | 2018-09-27 | 2020-04-03 | 西门子歌美飒可再生能源公司 | Wind turbine |
| US11346327B2 (en) | 2018-09-27 | 2022-05-31 | Siemens Gamesa Renewable Energy A/S | Wind turbine |
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