CN101604877B - Rotary motor - Google Patents
Rotary motor Download PDFInfo
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- CN101604877B CN101604877B CN2009101425277A CN200910142527A CN101604877B CN 101604877 B CN101604877 B CN 101604877B CN 2009101425277 A CN2009101425277 A CN 2009101425277A CN 200910142527 A CN200910142527 A CN 200910142527A CN 101604877 B CN101604877 B CN 101604877B
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Abstract
The invention provides a rotary motor having a frame for containing the motor and comprising, a bearing device for supporting a spindle containing a rotor rotatablely; a circulation system of cooling medium for cooling the motor by using the cooling medium to cycle in the frame; an oil seal element that is mounted on outer peripheral face of the spindle and locates on external side of the frame corresponding to the bearing device for preventing lubricant of the bearing device from flowing to external side of the famce; a sealing devcie for forming a seal chamber in the frame and forming a space between the sealing device and the oil seal element for mounting the bearing device, and providing the pressure sealed medium to peripheral surface side of the spindle for preventing the cooling medium from leaking to external side of the frame, and the sealing device allows the sealed meduim to be provided to the sealing chamber; a contact type brush sealing members which are arranged contact with periperal surface of the spindle along the spindle, a sealing chamber is formed between the sealing member and the sealing device for preventing the cooling medium from supplying to the sealing chamber, so as to prevent the cooling medium from mixing with the sealing medium in the sealing chamber.
Description
The application be that November 13, application number in 2003 are 200380108749.8 the applying date, denomination of invention divides an application for the application for a patent for invention of " turning motor ".
Technical field
The present invention relates to a kind of turning motor, it has a shaft sealer, said shaft sealer use a kind of coolant for example hydrogen cool back the rotating motor body, and seal shaft breakthrough part.
Background technology
In the high-power turbo generator, for example, pressurized hydrogen is sealed in the machine, and the rotor that constitutes generator body (turning motor body) all uses hydrogen to cool off with stator.Because hydrogen has than low density of air and high specific heat, therefore, said hydrogen-cooled generator can be operated expeditiously.Therefore, many powerful turbogenerators all use above-mentioned this cooling system.Japanese kokai publication hei 7-75291 communique) and (prior art document 2: japanese kokai publication hei 10-14158 communique)) in this hydrogen-cooled generator, be used to hydrogen in the machine that prevents and leak into the two ends that outside shaft sealer is installed in generator from bearing and (see (prior art document 1:.
Below, will traditional shaft sealer be described referring to accompanying drawing.Figure 28 cools back in the rotating motor cutaway view with a near end of the turning motor the shaft sealer 99 of hydrogen sealing in machine at traditional hydrogen.Reference numeral 1 expression has the rotor frame of drum, and a tailstock 3 is fixed on the end of rotor frame 1 by means of a rotor frame end plate 2.A bearing pedestal 4 is fixed on the tailstock 3, and a pedestal 5 is connected the inboard of bearing pedestal 4, and a bearing arrangement (bearing) 6 is connected the inboard of pedestal 5.Bearing 6 is supporting rotating shaft 7 with the mode that rotating shaft (axle) 7 is rotated.
A capsul 9 and a sealing ring 10 of constituting shaft sealer 99 are used for hydrogen 8 is sealed in by in rotor frame 1, rotor frame end plate 2, tailstock 3 and the cingens machine of analog, and purpose is that hydrogen is not fallen from the clearance leakage that rotating shaft 7 places of rotating along with the running of turning motor form.And oil guard 11 and 12 is located at the machine outside and machine inboard respectively, thereby employed lubricating oil can not leak in shaft sealer 99 and the bearing 6, and has a space that is called annular seal space 13 to be located between inboard oil guard 12 and the outside oil guard 11.
Figure 29 is an enlarged drawing, shows the details of the capsul 9 and the sealing ring 10 of formation shaft sealer 99.In Figure 29, sealing ring 10 comprises two sealing ring 10A and 10B, and they align in the axial direction each other, and each sealing ring all is processed to the external diameter that internal diameter is a bit larger tham rotating shaft 7.
Figure 30 is the cutaway view that the arrow 30-30 in Figure 29 is done; Sealing ring 10B is formed by a sealing ring first half 10Ba and a sealing ring Lower Half 10Bb, and said sealing ring first half 10Ba and sealing ring Lower Half 10Bb form a semicircle respectively in a circumferential direction with respect to rotating shaft 7.Sealing ring 10A is identical with sealing ring 10B.
The sealing oil 17 of 19 outflows flow to annular seal space 13 sides and said bearing arrangement side from the circumferencial direction gap.The sealing oil 17 that has flowed out to annular seal space 13 sides is reclaimed separately or optionally, has flowed out to the sealing oil of said bearing arrangement side and has together reclaimed with lubricating oil from bearing arrangement 6.The oil of every kind of recovery mixes to get up after reclaiming once more, and is shown in figure 31,59 pressurizations of their working pressure pumps, and deliver to said shaft sealer and said bearing arrangement respectively.Yet, flow to the sealing oil 17 of bearing arrangement 6 sides from circumferencial direction gap 19 and air from the lubricating oil around of said bearing arrangement, therefore, can in oil, be mixed with and turn back to compression pump 59 under the air state.Because oil is delivered to said shaft sealer after pressurization, therefore, flow to the part air of sneaking into the sealing oil 17 of annular seal space 13 sides from circumferencial direction gap 19 and can escape into annular seal space 13 sides.What replace like this, is exactly that hydrogen 8 in the machine that is in the annular seal space 13 mix with sealing oil 17 and are discharged into outside the machine.The air that escapes in the annular seal space 13 can be by means of the hydrogen 8 in the gap dessert machine between oil guard 12 and the rotating shaft 7, and like this, the purity of the hydrogen 8 in the machine will reduce.
For fear of above problem occurring; In common shaft sealer; Oil will stand to vacuumize (degassing) in vacuum extractor (exhaust apparatus) 58 before getting into compression pump 59 handles; Thereby oil can not have entrained gas for example to be supplied to said shaft sealer or bearing arrangement 6 under cooled hydrogen 8 or the air state.
Yet vacuum extractor 58 is more expensive relatively, and therefore, this is a key factor that causes hydrogen or analog to increase as the cost of the turning motor of coolant.
Should be understood that; In Figure 31; Except said structure; The turning motor body can be contained in the said framework, or it can comprise that hydrogen withdrawing device that the hydrogen that will in circulatory system (not shown), circulate extracts out 55, one are used for air withdrawing device 56 and lubricating oil system 57 that is used for the lubricating oil of removing air is delivered to vacuum extractor 58 and bearing arrangement 6 that air is extracted out from the lubricating oil in the bearing arrangement 6.
Except the prior art instance of above-mentioned shaft sealer, also have a non-contacting seal device, it is constructed as follows.For example shown in figure 28, sealing ring 10 is contained in the capsul 9 that is connected on the tailstock 3, and spring 20 is supported to such an extent that can between himself and rotating shaft 7, form a close clearance.Sealing ring 10 rotating shaft 7 axially on be arranged in a side-by two row, the oil that pressure is a bit larger tham the gas pressure in the machine is supplied to the gap between sealing ring 10 and the rotating shaft 7 from the outside.Hydraulic oil is through said gap, and the gas in the machine is owing to the oily formation of the leakage shown in the arrow among Figure 29 obtains sealing.In such structure; Because sealing ring 10, capsul 9 and rotating shaft 7 etc. can be with the mode generation thermal deformations of complicacy in operating process; Therefore, the amount of sealing oil (flushing oil) can surpass design load, is increased to sometimes above (particularly when starting) desired amount in the transition.And because distortion, the local thickness of oil film can reduce, thereby the frictional force of this part can cause vibration.In recent years, the brush contact seal part that is used to solve above-mentioned these problems has been obtained great development, and is existing just as gas turbine or the air seals of steam turbine, the liquid sealant or the Dust guard seal of low pressure differential.Yet, in the liquid sealant that is used for High Pressure Difference of using liquid as sealing medium (flushing oil), for example under with the situation of air seal in turbogenerator, can not obtain enough good sealing property, and, need a large amount of sealing oil.
Except above-mentioned prior art, also there is following prior art document: prior art document 3 (TOHKEMY 2002-81552 communique), prior art document 4 (TOHKEMY 2003-161108 communique), prior art document 5 (TOHKEMY 2002-303371 communique) and prior art document 6 (TOHKEMY 2001-90842 communique).
In prior art document 3, the rotor of similar rotating shaft has an improved brush seal installation, and it is located on the part that connects the pressure next door, below with described.In other words; This case description be brush seal installation with this structure of " a plurality of brush seal sections of cutting apart in a circumferential direction ", purpose be during fabrication or during the inspection after beginning to operate removable brush seal installation be convenient to take out inner rotating shaft.Yet, do not have to describe any measure be used to solve the overturning that brush seal possibly occur because of the pressure that leaks oil.
Simultaneously; In prior art document 4, the action effect of labyrinth has been described, wherein; Through low-pressure side a backboard is set and improves sealing property at the high-pressure side of said labyrinth and said brush seal; Or as a kind of alternative method, connect a brush seal through the both sides at said labyrinth and also can improve sealing property, this point is different with oil guard.
Summary of the invention
First purpose of the present invention provides a kind of turning motor, and it comprises a shaft sealer that can prevent that refrigerating gas from contacting with sealing oil and the purity of the refrigerating gas in the inhibition machine reduces under the situation that need not outgas to sealing oil.
Second purpose of the present invention provides a kind of turning motor; Wherein, Concerning just enough from starting to all operating conditions of normal rotation minor amount of oil; And do not have excessive oil mass change, said turning motor also comprises a high voltage bearing brush contact sealing device with good stability of vibration.
The 3rd purpose of the present invention provides a kind of turning motor; Wherein, The purity of the coolant in the machine can not reduce, and needn't be to its processing that outgases before sealing medium is supplied with, and said turning motor comprises a low-cost shaft sealer that does not need vacuum extractor.
To achieve these goals, the invention provides a kind of turning motor according to a first aspect of the invention, it comprises: bearing arrangement, and its rotating shaft that will have rotor can be rotated to support in the framework that is holding the turning motor body; Cooling medium circulation system, it is used to make coolant in said framework, to circulate, to cool off said turning motor body; Gasket set, it is supplied to the outer peripheral face side of said rotating shaft with sealing medium, and prevents that said coolant from leaking into the outside of said framework; And sealing mechanism, it is arranged to contact with the outer peripheral face of said rotating shaft, and prevents said coolant and said sealing medium, or the lubricant medium in said sealing medium and/or the said bearing arrangement contacts with extraneous air.
To achieve these goals, the invention provides a kind of turning motor according to a second aspect of the invention, it comprises: bearing arrangement, and in this bearing arrangement, the rotating shaft that has rotor can be rotated to support in the framework that is holding the turning motor body; Cooling medium circulation system, it is used to make coolant in said framework, to circulate, to cool off said turning motor body; Oil guard, it is placed on the rotating shaft outer peripheral face of at least one side in the outside that is arranged in said bearing arrangement framework, and the lubricant medium that prevents to be supplied to said bearing arrangement to flow to said framework inboard or flow to the said framework outside; Sealing device; It is positioned to and is used in said framework, between the said oil guard of said bearing arrangement and said framework inboard, forming annular seal space; And sealing medium is supplied to the said outer peripheral face side of said rotating shaft, leaks into the outside of said framework to prevent said coolant; And sealing mechanism; It is arranged to contact with the outer peripheral face of said rotating shaft; And prevent the medium in said coolant and the said annular seal space, or said coolant and said sealing medium, or the lubricant medium in said sealing medium and/or the said bearing arrangement contacts with extraneous air.
To achieve these goals, the invention provides a kind of turning motor according to a third aspect of the present invention, it comprises: bearing arrangement, and its rotating shaft that will have rotor can be rotated to support in the framework that is holding the turning motor body; Cooling medium circulation system, it is supplied to coolant in the said framework, to cool off said turning motor body; The brush seal retainer, it is installed in said inside of frame and the outside at least one, and forms predetermined spatial accommodation through the outer circumferential side that surrounds said rotating shaft; A brush seal mechanism body; It comprises an annular brush seal and a support, and said annular seal brush is in the said brush seal retainer, and is held in the following manner; Promptly said rotating shaft axially on form multistage; Every section all contacts with said rotating shaft, and said support is used for said brush seal at every side bearing of said rotating shaft opposition side, and each said brush seal all is axially arranged with a plurality of radially cutting parts along said; Staggering each other in the position of the said cutting part of adjacent each section brush seal, leaks into the outside of said framework to prevent the coolant in the said framework; And overturning prevents part, and it prevents that said brush seal in the said brush seal retainer is because the pressure differential between outside said coolant and the said framework and overturning in the axial direction.
To achieve these goals, the invention provides a kind of turning motor according to a fourth aspect of the present invention, it comprises: bearing arrangement, and its rotating shaft that will have rotor can be rotated to support in the framework that is holding the turning motor body; The lubricant medium circulatory system, it is used for making lubricant medium to circulate at said bearing arrangement; Cooling medium circulation system, it is used to make coolant in said framework, to circulate, to cool off said turning motor body; Oil guard, it is placed on the rotating shaft outer peripheral face in the inboard that is positioned at said bearing arrangement framework and/or the outside, and the lubricant medium that prevents to be supplied to said bearing arrangement to flow to said framework inboard or flow to the said framework outside; Gasket set, it to be more being placed in the said framework near the inboard mode of machine than said bearing arrangement, and sealing medium is supplied to the outer peripheral face side of said rotating shaft, and prevents that said coolant from leaking into the said framework outside; And sealing mechanism, it is formed contacting with the rotating shaft outer peripheral face by brush seal, and prevents that said sealing medium and said lubricant medium from contacting with each other.
To achieve these goals, the invention provides a kind of turning motor according to a fifth aspect of the present invention, it comprises: bearing arrangement, and its rotating shaft that will have rotor can be rotated to support in the framework that is holding the turning motor body; The lubricant medium circulatory system, it circulates lubricant medium in said bearing; Cooling medium circulation system, it circulates coolant in said framework, to cool off said turning motor body; Oil guard, it is positioned to the rotating shaft outer peripheral face in the framework inboard that is positioned at said bearing arrangement and/or the outside and contacts, and the lubricant medium that prevents to be supplied to said bearing arrangement flows to the inboard of said framework or flows to the outside of said framework; And sealing mechanism, the outside that it is positioned on the lateral surface of said bearing or is separated by with said bearing, and comprise a structure with the brush seal that contacts with the outer peripheral face of said rotating shaft, and prevent that said sealing medium and extraneous air from contacting with each other.
To achieve these goals, the invention provides a kind of turning motor according to a sixth aspect of the invention, it comprises: bearing arrangement, and its rotating shaft that will have rotor can be rotated to support in the framework that is holding the turning motor body; The lubricant medium circulatory system, it is used for making lubricant medium to circulate at said bearing arrangement; Cooling medium circulation system, it is used to make coolant in said framework, to circulate, to cool off said turning motor body; Oil guard, it is placed on the rotating shaft outer peripheral face in the inboard that is positioned at said bearing arrangement framework and/or the outside, and the lubricant medium that prevents to be supplied to said bearing arrangement flows to the inboard of said framework or flows to the outside of said framework; Gasket set, it to be more being placed in the said framework near the inboard mode of said framework than said bearing arrangement, and sealing medium is supplied to the outer peripheral face side of said rotating shaft, and prevents that said coolant from leaking into the outside of said framework; And sealing mechanism; Its said framework that is positioned at said bearing arrangement is inboard; And form contacting by brush seal, and prevent that said lubricant medium in said coolant and the said bearing arrangement from contacting with each other and prevent that said coolant from leaking into the machine outside with the rotating shaft outer peripheral face.
To achieve these goals, the invention provides a kind of turning motor according to a seventh aspect of the present invention, it comprises: bearing arrangement, and its rotating shaft that will have rotor can be rotated to support in the framework that is holding the turning motor body; The lubricant medium circulatory system, it is used for making lubricant medium to circulate at said bearing arrangement; Cooling medium circulation system, it is used to make coolant in said framework, to circulate, to cool off said turning motor body; Oil guard, it is placed on the rotating shaft outer peripheral face in the inboard that is positioned at said bearing arrangement framework and/or the outside, and the lubricant medium that prevents to be supplied to said bearing arrangement flows to the inboard of said framework or flows to the outside of said framework; And sealing mechanism, it is positioned at the said framework outside of said bearing arrangement, and is formed contacting with the rotating shaft outer peripheral face by brush seal, and prevents that said lubricant medium and said sealing medium in the said bearing arrangement from contacting with each other.
Description of drawings
Fig. 1 is a cutaway view, shows an end that comprises according to the turning motor of the shaft sealer of the first embodiment of the present invention;
Fig. 2 is a cutaway view, shows the shaft sealer of turning motor according to a second embodiment of the present invention;
Fig. 3 is a cutaway view, shows an end of the turning motor of the shaft sealer that comprises a third embodiment in accordance with the invention;
Fig. 4 is a cutaway view, shows the shaft sealer of the turning motor of a fourth embodiment in accordance with the invention;
Fig. 5 is a cutaway view, shows the shaft sealer of turning motor according to a fifth embodiment of the invention;
Fig. 6 is a cutaway view, shows the shaft sealer of turning motor according to a sixth embodiment of the invention;
Fig. 7 shows the view of schematic structure according to a seventh embodiment of the invention;
Fig. 8 A and 8B all show the view according to the Facad structure of the brush seal of the 7th embodiment shown in Figure 7;
Fig. 9 is a key-drawing, and a kind of overturning that shows according to the brush seal of the eighth embodiment of the present invention prevents method;
Figure 10 is a key-drawing, and the another kind of overturning that shows according to the brush seal of the eighth embodiment of the present invention shown in Figure 9 prevents method;
Figure 11 is a key-drawing, shows to be used to fill in a kind of method of filling out according to the gap between the brush seal of the nineth embodiment of the present invention;
Figure 12 shows the tenth embodiment, is a key-drawing, and what illustrate is to be used to fill in the another kind of method of filling out according to the gap between the brush seal of the 9th embodiment shown in Figure 11;
Figure 13 is a key-drawing, shows a kind of maintenance method according to the concentric of the rotating shaft of the 11st embodiment of the present invention and brush seal;
Figure 14 shows the 12 embodiment, is a key-drawing, and what illustrate is the another kind maintenance method according to the concentric of the said rotating shaft of the tenth embodiment and said brush seal;
Figure 15 shows the 13 embodiment, is a key-drawing, and what illustrate is a kind of external control maintenance method according to the concentric of the said rotating shaft of the embodiment of the invention shown in Figure 13 and 14 and said brush seal;
Figure 16 shows the 14 embodiment, is a key-drawing, and what illustrate is the another kind of external control maintenance method according to the concentric of the said rotating shaft of the embodiments of the invention shown in Figure 13 to 15 and said brush seal;
Figure 17 shows the 15th embodiment of the present invention, and what illustrate is a kind of structure that is used for brush contact seal part is applied to the method for turbogenerator of explanation;
Figure 18 shows the 15 embodiment shown in Figure 17, and what illustrate is the structure when said brush contact seal part is applied to said turbogenerator;
Figure 19 shows the 16 embodiment, and what illustrate is the structure when said brush contact seal part is applied to said turbogenerator;
Figure 20 is the axial cutaway view according to the near zone of the shaft sealer of the 17th embodiment of the present invention;
Figure 21 is the axial cutaway view according to the near zone of the shaft sealer of a kind of variant of the 17th embodiment of the present invention;
Figure 22 is the axial cutaway view according to the near zone of the shaft sealer of the 18th embodiment of the present invention;
Figure 23 is the axial cutaway view according to the near zone of the shaft sealer of a kind of variant of the 18th embodiment of the present invention;
Figure 24 is the axial cutaway view according to the near zone of the shaft sealer of the another kind of variant of the 18th embodiment of the present invention;
Figure 25 is the axial cutaway view according to the near zone of the shaft sealer of the 18th embodiment of the present invention;
Figure 26 is the axial cutaway view according to the near zone of the shaft sealer of the 19th embodiment of the present invention;
Figure 27 is the axial cutaway view according to the near zone of the shaft sealer of another variant of the 19th embodiment of the present invention;
Figure 28 is the cutaway view of said traditional shaft sealer;
Figure 29 is a cutaway view, and wherein, the capsul of Figure 28 partly is exaggerated;
Figure 30 is the cutaway view of being done as the line 30-30 along Figure 29 when the direction of arrow is seen; And
Figure 31 is the bearing arrangement of said traditional turning motor and the piping diagram of sealing medium.
Embodiment
Below, will the embodiment that comprise the turning motor of shaft sealer according to of the present invention be described referring to accompanying drawing.Fig. 1 is the axial cutaway view according to the near zone of the shaft sealer of the turning motor of the first embodiment of the present invention; It is with the difference that shows Figure 28 of above-mentioned prior art, need be located at annular seal space 13 places of an inboard oil guard 12 by the brush seal 21 as sealing mechanism of the lubricated part that seals scopiform one-tenth.In other words, in the present embodiment, shaft sealer 100 is made up of with the brush seal 21 that is installed on the inboard oil guard 12 sealing ring 10 of the inboard that is installed in capsul 9.
In shaft sealer 100 according to the structure like this of the said turning motor of first embodiment; Because the stirring action of internal pressure and rotating shaft 7 or analog can be attempted the entering annular seal space 13 from the gap between inboard oil guard 12 and the rotating shaft 7 as the hydrogen 8 of the coolant in the machine.Yet, owing to have no the brush seal 21 in gap to be installed in annular seal space 13 sides of inboard oil guard 12 between itself and the rotating shaft 7 basically, so hydrogen 8 can not get in the annular seal space 13.
Therefore, sealing oil 17 can get in the annular seal space 13, but sealing oil 17 will never contact with each other with hydrogen 8, thereby the purity of the hydrogen 8 in the machine will never reduce owing to the entrained gases (air) in the sealing oil 17.Like this, just needn't therefore, a vacuum extractor (exhaust apparatus) 58 needn't be set in lubricating oil feed system shown in Figure 31 to sealing oil 17 processing that outgases.In this case, must between said sealing ring and rotating shaft 7, supply with for example sealing oil of sealing medium that (being full of) do not have an entrained air.
Should be pointed out that brush seal 21 is according to its characteristic lubricated part of needs not naturally.And brush seal 21 can be by the sealing ring replacement that has babbit (white metal) on the inner peripheral surface.
Below, second embodiment of the shaft sealer of turning motor of the present invention will be described referring to Fig. 2.In other words; A kind of like this structure is provided, wherein, has been installed in annular seal space 13 sides of capsul 9 as the brush seal 22 of sealing mechanism; Said capsul 9 is keeping sealing ring 10A and 10B, and the sealing ring of being installed in said sealing ring 10A and 10B and the prior art is identical.
In the shaft sealer 101 of second embodiment with said structure; Sealing oil flow between sealing ring 10A and the rotating shaft 7 respectively and the close clearance 19 between sealing ring 10B and the rotating shaft 7 from the end play 18 of the sealing ring 10B of the sealing ring 10A of annular seal space side and bearing side; Then, respectively to annular seal space side and bearing side flow.Yet,, therefore, will never flow back to annular seal space 13 from the sealing oil 17 of annular seal space 13 sides because brush seal 22 is located at annular seal space 13 sides.
Therefore, the hydrogen 8 that gets into annular seal space 13 from the gap between inboard oil guard 12 and the rotating shaft 7 can not contact with sealing oil 17.Thereby even sneaked in the sealing oil 17 from air outside, the purity that is used as the hydrogen 8 of the refrigerating gas in the machine also will never reduce.Thereby need be to sealing oil 17 processing that outgases.Therefore, needn't in the lubricating oil feed system of prior art shown in Figure 31, vacuum extractor 58 be set.
Below, the 3rd embodiment of the shaft sealer of turning motor of the present invention will be described referring to Fig. 3.In the present embodiment; Inboard oil guard 12 among Figure 27 is not set, but on a tailstock 3, sealing mechanism is installed, wherein in this part place; A plurality of brush seals 24 are being supported by brush seal retainer 23, and said sealing mechanism does not need a lubricated part.Brush seal 24 is provided with multistage (being 3 sections in Fig. 3) in the axial direction.Shaft sealer 102 is made up of brush seal 24 and the sealing ring 10 that is installed on the capsul 9.
In the 3rd embodiment that as above constructs, brush seal 24 can stop the hydrogen 8 as the refrigerating gas in the machine to get in the annular seal spaces 13.And brush seal 24 can stop the sealing oil 17 that flows out from the gap between sealing ring 10 and the rotating shaft 7 to flow out in the machine from annular seal space 13 in an identical manner.Thereby because the hydrogen 8 in the machine will never contact with each other with sealing oil 17, therefore, even sneaked into air in the sealing oil 17, the air of sneaking in the sealing oil 17 can not be discharged in the hydrogen 8 in the machine yet, thereby the purity of hydrogen can not reduce.Therefore; Needn't in the feed system of sealing oil 17, be provided with one and be used for vacuum extractor that sealing oil 17 is outgased and handles; Thereby; Vacuum extractor 58 in the feed system of sealing oil shown in Figure 31 17 just needn't be set, and that this device has become in the shaft sealer of the turning motor of prior art is essential.
Below, description is comprised the 4th embodiment of the turning motor of shaft sealer of the present invention.As shown in Figure 4, in the present embodiment, in the sealing ring 10 that the sealing ring 10B by the sealing ring 10C of annular seal space side and bearing side constitutes, the axial length of sealing ring 10C (width) is greater than the axial length (width) of sealing ring 10B.
In the gasket set 103 of the 4th embodiment that forms in the above described manner; Sealing oil 17 flows between sealing ring 10C and the rotating shaft 7 respectively and the close clearance 19 between sealing ring 10B and the rotating shaft 7 from the end play 18 of sealing ring 10; Then, flow out to annular seal space side and bearing side respectively.
In this case; Because the axial length of the sealing ring 10C of annular seal space side is greater than the axial length of the sealing ring 10B of bearing side; Therefore; When sealing oil 17 flowed to end play (close clearance) 19, the stream impedance of the sealing ring 10C of annular seal space side was greater than the stream impedance of the sealing ring 10B of bearing side.Like this, even gap 19 is on the same circumferencial direction, the said sealing oil (among the figure shown in the dotted arrow) that flows out to annular seal space 13 sides also can be less than the sealing oil 17 that flows out to the bearing side.
The axial length of the sealing ring 10C through regulating the annular seal space side by this way and the sealing ring 10B of bearing side; The amount that flows out to the sealing oil 17 of annular seal space 13 sides can become few; Thereby the amount that is discharged into the entrained air in the sealing oil 17 in the hydrogen 8 in the annular seal space 13 also can be few.
Except the shape of the sealing ring 10C of annular seal space side, the 4th embodiment has and the prior art identical construction, and annular seal space 13 forms by being in the inboard inboard oil guard 12 of machine.Because the internal circulating load between the cooled hydrogen 8 that machine is inboard and the hydrogen 8 of annular seal space 13 sides can reduce owing to there is inboard oil guard 12, therefore, the degree that the air of sneaking in the sealing oil 17 reduces the purity of the hydrogen 8 in the machine can be very low.
Therefore, needn't in the feed system of sealing oil shown in Figure 31 17, be provided for vacuum extractor 58 that sealing oil 17 is outgased and handles.Thereby, just no longer need the vacuum extractor 58 in the feed system of sealing oil 17, and that this device has become in the shaft sealer of the turning motor of prior art is essential.
Below, description is comprised the 5th embodiment of the turning motor of shaft sealer 104 of the present invention.As shown in Figure 5, the sealing ring of said annular seal space side replaces with a brush seal 25, and the sealing ring 10B of brush seal 25 and bearing side is keeping by capsul 9.Have an end play 18 between brush seal 25 and the sealing ring 10B, and its periphery is being pushed by a spring 20.The interior week of brush seal 25 contacts with the outer peripheral face of rotating shaft 7, but between the periphery of the interior week of said sealing ring 10B and rotating shaft 7, has a circumferencial direction gap 19.
In the embodiment that constructs in the above described manner, sealing oil 17 only flows out to said bearing side by means of the sealing ring 10B and the circumferencial direction gap 19 between the rotating shaft 7 of bearing side from end play 18.And; Owing to there is brush seal 25; The hydrogen 8 that has got in the machine in the annular seal space 13 by means of the gap between inboard oil guard 12 and the rotating shaft 7 can directly not contact with sealing oil 17; And the air in the sealing oil 17 can not be discharged in the hydrogen 8, thereby the purity of the hydrogen 8 in the machine can not reduce.Therefore; Needn't in the feed system of Figure 30, the sealing oil 17 shown in 31, be provided for vacuum extractor 58 that sealing oil 17 is outgased and handles; Thereby; In the feed system of sealing oil 17, just do not need vacuum extractor 58, and that this device has become in the shaft sealer of the turning motor of prior art is essential.In addition, because said hydrogen can not get in the annular seal space 13 because of brush seal 21A, therefore do not need vacuum extractor 58 yet.
Below, description is comprised the 6th embodiment of the turning motor of shaft sealer 105 of the present invention.As shown in Figure 6, inboard oil guard 12 is replaced by brush seal 21A and 21B respectively with outside oil guard 11, and these can be in an identical manner through coupling together tailstock 3 and bearing pedestal 4 acquisition.According to the embodiment of Fig. 6, because oil guard 11 and 12 are not set, therefore, part count is less, thereby cost is reduced.
Fig. 7 is a view that shows schematic structure according to a seventh embodiment of the invention.As shown in Figure 7, brush seal mechanism comprises brush seal retainer 15 and a brush seal mechanism body.
Brush seal retainer 15 surrounds outside and the outer circumferential side of rotating shaft 7 of framework of inside of frame and/or the turning motor of turning motor, and has wherein formed a predetermined spatial accommodation.Said brush seal mechanism body is held like this; Be the axial formation of multistage brush seal 21, and each brush seal 21 all have an annular seal brush 21b and a cardinal extremity support 21a who is supporting said brush seal at the rotating shaft opposition side who contacts with rotating shaft 7 along the rotating shaft that is positioned at brush seal retainer 15 7.Shown in Fig. 8 A and 8B; Each brush seal 21 is all by along radially being divided into multistage; And the cutting part 21ac of the cardinal extremity support 21a of adjacent segment staggers with the offset of the cutting part 21bc of sealing brush 21b, thereby the refrigerating gas in the framework can not leak into outside the framework.Fig. 8 A and 8B show the structure when two brush seals 21 shown in Figure 7 when axially seeing respectively, and they are formed the circle that surrounds rotating shaft 7.And shown in Fig. 8 A and 8B, said brush seal is owing to the assembling reason is divided into 2 sections (or more than 3 sections) diametrically.In this case, owing in cutting part, be formed with the gap, therefore, a large amount of oil leakage 14 among Fig. 7 possibly appear in this.
Then; Brush seal 21 is with axial arranged along said rotating shaft of the form of two sections or multistage; And the cutting part 21ac of brush seal 21 and 21bc are contained in the said brush seal retainer in this wise; Staggering in a circumferential direction in the position that is them, in this case, can obtain reducing from the oil leakage 14 of cutting part.
Should be pointed out that as shown in Figure 7ly, be located at the width of the width of the clamping part on the cardinal extremity support 21a of brush seal 21 greater than sealing brush 21b, therefore, can between brush seal retainer 15 and the brush seal 21 and sealing brush between the 21b and form the gap.
For above-mentioned reasons; Brush seal 21 can be because of from the pressure effect overturning (bending) of high-voltage section to the oil of low voltage section; And between the front end of rotating shaft 7 and sealing brush 21b, form a gap, therefore, can not keep suitable extruding (rotating shaft external diameter-sealing brush internal diameter) again.
Fig. 9 is the view that is used to explain the seventh embodiment of the present invention that has been conceived to be used to address these problems.The interior perimembranous of brush seal retainer 15 has an overturning and prevents part 35 (step), and it can prevent brush seal 21 overturnings.By the way, but prevent that in overturning mounting board brush seal 21 under the effect of part 35, therefore, can prevent brush seal 21 overturnings, thereby, resistance to pressure and excellent sealing performance can be had.
Figure 10 is the view that is used to explain the eighth embodiment of the present invention.Brush seal 21 have one movably overturning prevent part 26, it is used at random changing the mounting board width of brush seal 21, thus overturning prevents that the released amount of part 26 from can regulate through adjustment screw 28.Through adopting this structure, suitable mounting board width can be provided.
As shown in Figure 7, have between the brush seal 21 of multistage and have the gap.Can pass through said gap from the cutting part 21ac of first section brush seal 21 and the liquid of 21bc leakage, the circumferencial direction along said rotating shaft flows then, leaks into the cutting part of next section brush seal 21 at last.
Through above-mentioned this mode, possibility below existing: liquid can arrive the final stage brush seal and leak away.In the embodiment shown in Fig. 9 and 10, above-mentioned gap can be formed lessly, but shown in Fig. 9 and 10, is still keeping very large gap.
Figure 11 is the view that is used to explain the nineth embodiment of the present invention that has been conceived to be used to address the above problem, and in the present embodiment, alternately is located between a plurality of brush seals 21 as the sealing plate 29 of distance piece.Like this, between brush seal 21, will have only very little or very close to each other, thereby the path of escape of liquid will be stopped up, and therefore, can reduce leakage rate.
Figure 12 is the view that is used to explain the tenth embodiment of the present invention, and in the present embodiment, the distance piece 29 shown in Figure 11 is replaced by the little brush seal that contacts with rotating shaft 7 30, thereby, can obtain the effect identical with Figure 11.
Below, the 11 embodiment will be described.
Figure 13 is the view that is used to explain the 11st embodiment of the present invention that is used for solution to the problems described above.Be provided with a retainer supporting shell 51, said sealing mechanism is contained in the retainer supporting shell 51, and spring 42 supporting a plurality of positions on the circumference, thereby, can be along moving radially said sealing mechanism.Therefore, said sealing mechanism can be because the reaction force acts of brush seal 21 on the eccentric direction of rotating shaft 7 be got back to concentric position.
Figure 14 is the view that is used to explain the 12nd embodiment of the present invention, and in the present embodiment, the function of Figure 13 realizes through another kind of structure.In other words, a support plate 34 is installed on the outer peripheral face of brush seal 21, and is being supported by the spring 33 between support plate 34 and the brush seal retainer 15.Should be pointed out that seal washer 53 is located on the sliding surface between brush seal retainer 15 and the support plate 34, thereby, can prevent to leak from sliding surface.
Figure 15 is the view that is used to explain the 13rd embodiment of the present invention.Spring 33 among Figure 14 is replaced by bellows 50 and a gap sensor 38 that is used for the relative position of sound-pipe 36, rotating shaft 7 and brush seal 21; Wherein, Said pipe 36 is used for supplying with and discharging the high-pressure fluid 37 of bellows 50, thereby, can be from the external control concentric.
The eccentric state of rotating shaft 7 and brush seal retainer 15 can be measured through the gap sensor 38 that is installed on the brush seal retainer 15.Supply with or discharge said high-pressure fluid 37, eliminating offset, or increase the pressure in the bellows 50 of opposition side, thereby the length of bellows 50 can be adjusted through the pressure that reduces in the biased bellows 50.
Through on circumference, settling four gap sensors 38 and bellows 50 with 90 ° interval at least, the off-centre on any direction all can obtain handling.
Figure 16 is the view that is used to explain the 14th embodiment of the present invention.Bellows 50 among Figure 15 is replaced by a piezoelectric element 39, and the length of piezoelectric element 39 can be controlled through the voltage that change imposes on it, thereby, can obtain identical functions with Figure 15.
What Figure 17 and 18 all illustrated is the 15th embodiment of the present invention, and in the present embodiment, a brush contact sealing device is applied on the turbogenerator.The said contact sealing device that is provided is the machine outside and the inboard contact seal part 40 and 41 of machine of seal mount pad 44, and wherein, said seal mount pad 44 was installed on the interior week of bearing pedestal 4.Said contact sealing device is supplied with sealing oil 17 between contact seal part 40 and 41, so that hydrogen 8 is sealed in the machine.
The 15 embodiment is that the application of said contact sealing device can make the increase of the too much sealing oil mass that is produced in the floating seal of prior art system or the frictional vibration reduction that is caused by frictional force.
Figure 19 is the view that is used to explain the 16th embodiment of the present invention.The seal mount pad 44 on the inner peripheral that is located at the tailstock 3 shown in Figure 17, brush contact seal part 40A and 41A are located at the inboard and machine outside of machine as illustrated in fig. 15.The instance of other possibility structures comprises gap sensor 38A and 38B, bellows 50A and 50B and seal washer 27A and 27B naturally.In this case, can obtain the effect identical equally with Figure 15.
Figure 20 is the axial cutaway view in the shaft sealer zone of turning motor, is used to explain the 17th embodiment of the present invention.The difference of the prior art shown in present embodiment and Figure 28 is; The sealing mechanism 31 that comprises a brush seal is installed on the side relative with bearing 6 in the capsul 9; Said capsul 9 is installed on the tailstock 3 of prior art; Thereby said brush seal can contact with the outer peripheral face of said rotating shaft.Except above-mentioned, identical among other structural details and Figure 28, and the basic role of shaft sealer (it comprises capsul 9 and sealing ring 10) is identical.
In the embodiment of like this Figure 20 of structure, the brush seal 31 of bearing arrangement (comprising bearing pedestal 4, pedestal 5 and bearing 6) side of capsul 9 that is installed in the shaft sealer of prior art can prevent to be supplied to the capsul 9 of the shaft sealer that constitutes prior art and the sealing oil 17 in the gap between the rotating shaft 7 is mixed with the lubricating oil that is supplied to said bearing arrangement.Because each oil content does not circulate in the different circulatory systems, therefore, the mixing of oil can not appear.Therefore, the entrained air in the lubricating oil will never and be discharged in the shaft sealer of prior art through brush seal 31.And the hydrogen 8 that is blended in the machine in the sealing oil 17 will never and be discharged into said bearing arrangement side through brush seal 31.Therefore, the purity of the hydrogen 8 in the machine can be owing to the entrained air in the sealing oil 17 reduce, thereby, needn't be to sealing oil 17 processing that outgases, thereby, also vacuum extractor 58 needn't be set in lubricant supply system as in the prior art.Brush seal 31 is according to its characteristic needs lubricant not naturally.
Figure 21 is the view that is used to explain the variant of Figure 20, and in this variant, the brush seal 31 shown in Figure 20 is not installed on the side of capsul 9 of said shaft sealer, and on the side relative with capsul 9 that is mounted in bearing 6.Can acquisition with the situation of Figure 21 and 22 under identical action effect.
Below, the 18 embodiment of the turning motor comprise shaft sealer of the present invention will be described referring to Figure 22,23,24 and 25.Figure 22 is the axial cutaway view according to the near zone of the said shaft sealer of the said turning motor of the 18th embodiment of the present invention.The difference of the prior art shown in present embodiment and Figure 28 is, on the side relative with outside oil guard 11 that brush seal is installed in bearing 6.Except above-mentioned, identical among other structural elements and Figure 28, and the basic role of shaft sealer 107 and prior art are identical.
In the 18 embodiment that so constructs; Through on the side of the shaft end side of the bearing 6 of said bearing arrangement, brush seal 31 being set, the sealing oil 17 that is supplied to the shaft sealer of prior art will never contact with extraneous air with the lubricating oil that is supplied to said bearing arrangement.Air can not sneaked in these oil, but only sneak into machine in the cooled hydrogen 8 of side contacts, therefore, air will never be discharged into the hydrogen 8 in the machine from these oil.Therefore, the purity of the hydrogen 8 in the machine will never reduce, and need be to sealing oil 17 processing that outgases, thereby, need not have vacuum extractor 58 in the lubricant supply system shown in Figure 30.
Figure 23 shows an instance, wherein, brush seal 31 be located at the outside in the oil guard 11 near on the inboard side of machine, rather than be located on the side of shaft end side of bearing 6.Shown in figure 23, on the side of the outside oil guard 11 through brush seal 31 being located at the machine outside, lubricating oil also can be lubricated the side of the shaft end side of bearing 6, and the cooling performance of bearing arrangement can not reduce.
Figure 24 shows an instance, and wherein, brush seal 31 is located on the shaft end side of outside oil guard 11, rather than is located on the side of shaft end side of bearing 6.Under the situation of brush seal 31 shaft end side that is located at outside oil guard 11 shown in figure 24, brush seal 31 easy mounting, and also can be used for the device that has been designed.
Figure 25 shows an instance; Wherein, Oil guard 11 usefulness brush seal retainers 23 in the outside replace, and said brush seal retainer 23 is installed on the side that is positioned at axle head one side of bearing pedestal 4, and brush seal 31 is located on the brush seal retainer 23.Replace as illustrated in fig. 25 in the structure of outside oil guard 11 at brush seal 31, part count can be less, therefore, can reduce cost.
Below, the 19 embodiment of turning motor of the present invention will be described referring to Figure 26 and 27.Figure 26 and 27 all is axial cutaway views of near zone of the said shaft sealer of said turning motor.
The difference of the prior art shown in present embodiment and Figure 28 is; In Figure 26; Brush seal 31 is installed on the side near the machine inboard in the bearing 6, in Figure 27, does not have outside oil guard 11 not to be located on the bearing pedestal 4; Brush seal retainer 23 that the substitute is the brush seal 31 with an embedding is installed on the bearing pedestal 4, and the sealing ring 9 as the prior art shaft sealer all is not installed.Identical among other structural details and Figure 28.
In the 19 embodiment that constructs in the above described manner; In the structure of Figure 26; Because the hydrogen 8 in the machine can obtain being located at and can not leak into outside the machine near the sealing once more of the brush seal 31 on the inboard side of machine in the bearing 6; Therefore, hydrogen 8 can not leak into outside the machine, and can not contact with the lubricant that is supplied to bearing 6.In the structure of Figure 27; Lubricating oil and the hydrogen in the machine 8 that bearing 6 is lubricated are sealed by a brush seal 31 that newly is located at shaft end; Thereby, can not leak into outside the machine, wherein brush seal 31 diametrically opposed gaps in rotating shaft 7 are zero basically.Therefore, lubricating oil can not contact with extraneous air, and hydrogen can not leak into the outside yet.Therefore, even supply to once more by means of EGR under bearing 6 situation inboard with flowing out to machine at lubricating oil, air also will never be discharged into the hydrogen 8 in the machine from said lubricating oil, thereby the purity of the hydrogen 8 in the machine can not reduce.Therefore; Because vacuum extractor 58 needn't be set in lubricant supply system shown in Figure 29 to be come the lubricant processing that outgases; Thereby, no longer need vacuum extractor 58 in the lubricating oil feed system, and that this device has become in the shaft sealer of the turning motor of prior art is essential.
The present invention is not limited to the foregoing description, but can realize with various variant.For example, above-mentioned brush seal 21,21A, 21B and 31 can be formed by refractory material.Owing to formed by refractory material, even under the situation that incident unlikely occurs that hydrogen 8 leaks and lights, sealing can not caused the leakage rate of hydrogen 8 to increase by flame from damaging yet.Therefore, leakage rate is minimized, thereby, can improve and use the fail safe of hydrogen 8 as the turning motor of refrigerating gas.
Industrial applicibility
The present invention can be applicable to continuous circulating cooling medium turning motor, have and make bearing lubricant and the sealing medium generator of the lubricating system of circulation and use in the turning motor of hermetic coolant cooling any one separately respectively.
Claims (2)
1. turning motor, it has the framework (1) that is holding the turning motor body, and comprises:
Bearing arrangement (6), in this bearing arrangement, the rotating shaft (7) that has rotor can be rotated to support in the said framework (7);
Cooling medium circulation system, it is arranged to make coolant in said framework (1), to circulate, to cool off said turning motor body;
Oil guard (11) or first brush seal (21B), it is placed on rotating shaft (7) outer peripheral face, is positioned at the outside of framework (1) with respect to said bearing arrangement (6), and prevents that the lubricant that is supplied to said bearing arrangement (6) from flowing to said framework (1) outside;
Sealing device (102; 9; 10); It is positioned to the space that in said framework (1), forms annular seal space (13) and between said sealing device (102) and said oil guard (11) or first brush seal (21B), be formed for settling said bearing arrangement (6); And sealing medium is supplied to the said outer peripheral face side of said rotating shaft (7), leaks into the outside of said framework (1) to prevent said coolant, said sealing device (102) allows said sealing medium is fed to said annular seal space (13); And
Second brush seal (24 of contact-type; 21A), it is arranged to contact with the outer peripheral face of said rotating shaft (7) along said rotating shaft (7), at said second brush seal and said sealing device (102; 9; 10) form said annular seal space (13) between, and avoid coolant to be supplied to said annular seal space (13), thereby prevent that said coolant from mixing in annular seal space (13) with sealing medium.
2. turning motor as claimed in claim 1 is characterized in that, also comprises:
The lubricant medium circulatory system (57), it is constructed such that lubricant circulates in said bearing arrangement (6).
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002-329168 | 2002-11-13 | ||
| JP2002329168 | 2002-11-13 | ||
| JP2002329168 | 2002-11-13 | ||
| JP2003058273 | 2003-03-05 | ||
| JP2003-058273 | 2003-03-05 | ||
| JP2003058273 | 2003-03-05 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200380108749.8A Division CN1738986B (en) | 2002-11-13 | 2003-11-13 | Rotary electric machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101604877A CN101604877A (en) | 2009-12-16 |
| CN101604877B true CN101604877B (en) | 2012-03-21 |
Family
ID=36081231
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200380108749.8A Expired - Fee Related CN1738986B (en) | 2002-11-13 | 2003-11-13 | Rotary electric machine |
| CN2009101425277A Expired - Fee Related CN101604877B (en) | 2002-11-13 | 2003-11-13 | Rotary motor |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200380108749.8A Expired - Fee Related CN1738986B (en) | 2002-11-13 | 2003-11-13 | Rotary electric machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN1738986B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL2535621T3 (en) * | 2011-05-26 | 2014-11-28 | Siemens Ag | Shaft seal ring for a sealing oil seal system of a hydrogen-cooled generator |
| CN102223013A (en) * | 2011-06-16 | 2011-10-19 | 深圳飞能能源有限公司 | Flywheel energy storage system |
| CN102352922A (en) * | 2011-09-29 | 2012-02-15 | 江苏透平密封高科技有限公司 | Self-centering floating brush type sealing tile |
| EP2894770B1 (en) * | 2013-11-29 | 2018-06-13 | Mitsubishi Electric Corporation | Rotating machine equipped with shaft sealing device |
| CN108475959B (en) * | 2016-01-26 | 2020-02-28 | 三菱电机株式会社 | Rotating electrical machine and method for manufacturing rotating electrical machine |
| JP2020065355A (en) * | 2018-10-17 | 2020-04-23 | トヨタ自動車株式会社 | Motor cooler |
| CN111835147B (en) * | 2019-04-17 | 2022-11-11 | 山东交通学院 | Hub motor of electric automobile |
| CN110813665B (en) * | 2019-11-26 | 2021-06-22 | 张存存 | Anaerobic adhesive applicator for pipeline construction |
| CN112833190B (en) * | 2020-12-28 | 2022-07-19 | 东方电气集团东方汽轮机有限公司 | Rotary mechanical sealing system suitable for high-density and high-viscosity working medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2501304A (en) * | 1948-11-30 | 1950-03-21 | Westinghouse Electric Corp | Gland-seal bearing for gas-cooled equipment |
| US6378873B1 (en) * | 2000-06-02 | 2002-04-30 | General Electric Company | Low flow fluid film seal for hydrogen cooled generators |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3622350B2 (en) * | 1996-08-09 | 2005-02-23 | 株式会社デンソー | Rotating electric machine |
| JP2000120878A (en) * | 1998-10-20 | 2000-04-28 | Eagle Eg & G Aerospace Kk | Brush type sealing device |
| ATE278899T1 (en) * | 1999-08-03 | 2004-10-15 | Siemens Ag | SEAL FOR A SHAFT, ESPECIALLY FOR A GENERATOR SHAFT |
-
2003
- 2003-11-13 CN CN200380108749.8A patent/CN1738986B/en not_active Expired - Fee Related
- 2003-11-13 CN CN2009101425277A patent/CN101604877B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2501304A (en) * | 1948-11-30 | 1950-03-21 | Westinghouse Electric Corp | Gland-seal bearing for gas-cooled equipment |
| US6378873B1 (en) * | 2000-06-02 | 2002-04-30 | General Electric Company | Low flow fluid film seal for hydrogen cooled generators |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1738986B (en) | 2010-05-12 |
| CN1738986A (en) | 2006-02-22 |
| CN101604877A (en) | 2009-12-16 |
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