US20100313435A1 - Method and system for adjusting a turbomachine gland seal - Google Patents
Method and system for adjusting a turbomachine gland seal Download PDFInfo
- Publication number
- US20100313435A1 US20100313435A1 US12/481,736 US48173609A US2010313435A1 US 20100313435 A1 US20100313435 A1 US 20100313435A1 US 48173609 A US48173609 A US 48173609A US 2010313435 A1 US2010313435 A1 US 2010313435A1
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- United States
- Prior art keywords
- gland seal
- rotor
- seal
- gland
- bracket
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- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/122—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/64—Mounting; Assembling; Disassembling of axial pumps
- F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
Definitions
- the present invention provides a method and system for determining an alignment and adjusting a turbomachine gland seal, and more particularly a method and system for determining an alignment and adjusting a gland seal ring and a rotor of a hydrogen cooled electric generator.
- Turbomachines include a rotational shaft known as a rotor and a stationary portion known as a stator where a gas tight seal is required between the rotor and the stator.
- Turbomachines include, but are not limited to steam turbines, gas turbines, electric generators, compressors, and pumps.
- an electric generator typically includes main components like a rotor and stationary electrical conductors.
- the rotor typically includes rotor electrical conductors that produce a magnetic field when energized with an electric current. If the energizing current is direct, then the magnetic field produced is constant in magnitude. However, as the rotor rotates, the field strength at a stationary point will vary as the magnetic field poles pass by.
- the stationary electrical windings surround the rotor and are arranged to intersect the rotating magnetic field such that an alternating current is induced in the stationary electrical windings.
- the stationary windings are connected to an electrical network such that the induced alternating current is distributed to many users.
- generators are cooled by a cooling medium, such as air, water or hydrogen gas.
- a cooling medium such as air, water or hydrogen gas.
- care must be taken to prevent mixing of the hydrogen gas with the surrounding air to avoid an explosive mixture of hydrogen and oxygen.
- hydrogen cooled generators are operated under positive pressure and high hydrogen purity to ensure that a combustible mixture of hydrogen and oxygen does not result within the generator.
- a hydrogen cooled generator is typically enclosed within a strong shell like frame that can not only support the weight, operational and transient loads of the generator, but also contain the hydrogen gas and prevent it from escaping into the atmosphere where it can form into a combustible mixture.
- a gland seal also known as a hydrogen seal, is well known and functions by forcing a fluid, typically sealing oil, under a pressure greater than that exerted by the opposing hydrogen pressure through a radial gap provided between the rotor and a sealing surface of the gland seal.
- the sealing oil effectively seals the gap between the rotor and the gland seal thus preventing the leakage of the hydrogen gas and the resultant dangerous mixture of hydrogen and air.
- the radial gap between the gland seal and the rotor must be as small as practical while leaving sufficient clearance for rotation of the rotor.
- the diametrical clearance between the gland seal ring and the rotor is proportional to the rotor diameter at the axial location of the gland seal ring and typically is on the order of several thousands of an inch as measured on diameter. Due to the tight radial clearance between the rotor and the gland seal, radial and angular alignment of the gland seal to the rotor is critical. Improper alignment of the gland seal can lead to contact of the rotor with the gland seal causing impermissible wear of the gland seal and/or excessive rotor vibration. Both situations are unacceptable and will likely result in a forced shut down of the generator to remedy the situation.
- the rotor is typically supported at its opposite ends by bearings arranged outside of the gland seals, see FIG. 1 . Due to the large span between the bearings and the weight of the rotor, the rotor will sag in its middle causing a difference between a theoretical centerline of the machine and an instantaneous centerline of the rotor, see FIG. 5 . The rotor sag forms an angle between the instantaneous rotor centerline and the theoretical centerline of the machine.
- the gland seal should advantageously be aligned to the instantaneous angle of the rotor and not to the theoretical rotational centerline.
- the orientation of the gland seal is determined by the gland seal housing that supports the gland seal. Furthermore, the orientation of the gland seal housing depends upon an orientation of a mating surface between the gland seal housing and a structural bearing support bracket that the gland seal bracket attaches to.
- FIG. 1 is a simplified view of a known electric generator that employs the present invention
- FIG. 2 is an isometric view of a known gland seal and rotor that employs the present invention
- FIG. 3 is a cross-sectional view of the gland seal and rotor of FIG. 2 ;
- FIG. 4 is a view of a pressure bellows
- FIG. 5 shows the relationship between machine centerline and rotor instantaneous centerline
- FIG. 6 is a side view of FIG. 2 with a deflated pressure bellows installed
- FIG. 7 is a top view of FIG. 6 ;
- FIG. 8 is a close up view of FIG. 7 ;
- FIG. 9 shows the system of FIG. 8 with the pressure bellows inflated
- FIG. 10 shows the axial measurement of the gland seal.
- the present invention is disclosed in context of determining an alignment within an electric generator of an electric power production facility.
- the principles of the present invention are not limited to use with an electric generator or within an electricity power production facility.
- the methods and/or systems could be used within the aerospace, transportation or manufacturing industries or any other area where alignment of a slidable seal is needed between a stationary and rotating component.
- One skilled in the art may find additional applications for the methods, systems, apparatus, and configurations disclosed herein.
- the illustration and description of the present invention in context of the exemplary electric generator is merely one possible application of the present invention.
- the present invention has particular applicability for use as a method for determining an alignment within an electric generator.
- a hydrogen cooled electric generator 10 typically comprises a rotor 20 arranged along a centerline 12 of the generator 10 . At the ends of the generator 10 are bearing brackets 11 that include bearings that rotatably support the rotor 20 .
- the gland seal bracket 31 attached to the bearing bracket 11 is the gland seal bracket 31 .
- the gland seal bracket is removably affixed to the bearing bracket 11 where the gland seal bracket 31 is shown bolted to the bearing bracket 11 , however, one skilled in the art will readily appreciate that the gland seal bracket 31 can be fixed to the bearing bracket 11 in any manner suitable to removably affix the gland seal bracket 31 to the bearing bracket 11 .
- the gland seal bracket 31 has a recess 32 arranged circumferentially around the rotor 20 .
- a further circumferential recess or groove 33 Arranged along an axial face of the recess that is operatively exposed to the hydrogen gas of the generator interior 39 is a further circumferential recess or groove 33 .
- the axial face of the recess opposite the further recess 33 is the air side axial face 38 (see FIGS. 8 through 10 ).
- the recess 32 is configured to receive and support a gland seal 30 .
- the gland seal 30 is a well known structure forming a ring surrounding the rotor 20 .
- the gland seal 30 may be formed of several segments joined together or may be a unitary ring.
- the particular formation of the gland seal 30 is not determinative to the scope of the present invention and one skilled in the art will readily appreciate that there are many configurations of a gland seal 30 that are operative within the scope of the present invention.
- the gland seal inner diameter 35 is slightly greater than the rotor outer diameter 22 to form a radial gap R.
- the gland seal has internal passages (not shown) running from outer diameter openings onto the inner diameter of the gland seal 35 that operatively provide pressurized oil that fills the radial gap R such that the gland seal 30 rides upon an oil film 34 between the rotor and the gland seal inner diameter and effectively seals-off the radial gap R against the escape of the generator internal hydrogen gas.
- the gland seal 30 is rotationally restrained from rotating along with the rotor by anti-rotation pins (not shown) that engage the gland seal 30 and the gland seal bracket 31 .
- the rotor has a radial shoulder 21 arranged at an axial distance from the gland seal 30 .
- the radial shoulder 21 is formed such that the shoulder is essentially perpendicular to the instantiations centerline of the rotor 13 (see FIG. 5 ).
- a pressure bellows 40 is a flexible tube like structure having a middle hose portion 41 , a pressure tight closed end 42 and a selectively sealable and preferably pressure tight connecter 44 arranged at an open end 43 opposite the closed end 42 .
- the pressure bellows 40 is sized and configured such that it can be easily inserted into the further recess 33 and having an inflated diameter sufficient to expand within the further recess 33 and engage the gland seal 30 and secure the gland seal 30 against the recess air side axial face 38 (see FIGS. 8 and 9 ).
- the pressure bellows 40 is inventively employed to assist with the proper alignment of the gland seal 30 such that the gland seal 30 effectively seals the rotor 20 against the leakage of hydrogen gas.
- the oil film 34 must exert a force greater than that exerted by the internal hydrogen gas, otherwise the hydrogen gas would blow out the oil film 34 and escape through the radial gap R (see FIG. 3 ).
- the gland seal inner diameter surface 35 must be parallel to the rotor outer diameter surface 22 . Direct measurement or verification of the parallelism of the gland seal inner diameter surface 35 and the rotor outer diameter surface 22 is not practical.
- the gland seal 30 should be restrained such that the gland seal air side axial face 37 is firmly secured against the recess air side axial face 38 (see FIGS. 8 and 9 ).
- the present invention makes use of an inventive tube like pressure bellows 40 to reliably secure the gland seal 30 against the recess air side axial face 38 ( FIG. 9 ).
- the deflated pressure bellows 40 is guided into the oil well 33 provided in the gland seal bracket 31 , at least partially along a length of the circumferential further recess 33 , as seen in FIGS. 6 through 8 .
- a length of pressure bellows 40 is inserted to span at least a 45° arc, more preferably a 90° arc and most preferably a 180° arc or an entirety of the further recess 33 , however at a minimum, a length of pressure bellows 40 is required such that once inflated, sufficient force is exerted onto the gland seal 30 by the pressure bellows 40 to seat and secure the gland seal 30 against the recess air side axial face 38 .
- the pressure bellows connector 44 is attached to a pressurizing device (not shown), for example but not limited to a pump or compressor, to form a selectively sealable and preferably leak tight connection.
- the pressure bellows 40 Once the pressure bellows 40 is pressurized, the pressure bellows 40 expands within the further recess 33 and engages the gland seal 30 .
- the internal pressure of the pressure bellows 40 exerts a contact force in the axial direction against the gland seal 30 which urges the gland seal 30 against the recess air side axial face 38 , see FIG. 9 .
- Feeler gauges can be inserted in the resultant gap between the recess hydrogen side face 39 and the gland seal hydrogen side axial face 36 to verify that the gland seal 30 is properly seated against the recess air side axial face 38 .
- the axial distance X between the gland seal hydrogen side axial face 36 and the radial shoulder 21 as shown in FIG. 10 By repeating the measurement of the axial distance X, at least three times, a plane defining the surface of the gland seal hydrogen side axial face 36 can be determined relative to the rotor radial shoulder 21 .
- the parallelism of the gland seal inner diameter surface 35 and the rotor instantaneous centerline 13 can be inferred. Furthermore, the parallelism of the gland seal inner diameter surface 35 and the rotor instantaneous centerline 13 can be compared with a predetermined acceptable parallelism value. If the parallelism of the gland seal inner diameter surface 35 and the rotor instantaneous centerline 13 is determined to be unacceptable, an alignment of the gland seal 30 can be adjusted by adjusting the orientation of the gland seal bracket 31 .
- the mating surface of the gland seal bracket 31 can be machined appropriately to achieve the desired orientation of the gland seal 30 .
- the gland seal 30 is firmly secured against the recess air side axial face 38 by the inflated pressure bellows 40 the recess air side axial face 38 serves as a control surface that effectively determines the parallelism of the gland seal inner diameter surface 35 and the rotor instantaneous centerline 13 . Therefore, by adjusting the orientation of the gland seal bracket 31 relative to the rotor 20 the orientation of the gland seal 30 and ultimately the parallelism of the gland seal inner diameter surface 35 to the rotor instantaneous centerline 13 can be adjusted.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
- The present invention provides a method and system for determining an alignment and adjusting a turbomachine gland seal, and more particularly a method and system for determining an alignment and adjusting a gland seal ring and a rotor of a hydrogen cooled electric generator.
- Turbomachines include a rotational shaft known as a rotor and a stationary portion known as a stator where a gas tight seal is required between the rotor and the stator. Turbomachines include, but are not limited to steam turbines, gas turbines, electric generators, compressors, and pumps. For example, an electric generator typically includes main components like a rotor and stationary electrical conductors. The rotor typically includes rotor electrical conductors that produce a magnetic field when energized with an electric current. If the energizing current is direct, then the magnetic field produced is constant in magnitude. However, as the rotor rotates, the field strength at a stationary point will vary as the magnetic field poles pass by. The stationary electrical windings surround the rotor and are arranged to intersect the rotating magnetic field such that an alternating current is induced in the stationary electrical windings. The stationary windings are connected to an electrical network such that the induced alternating current is distributed to many users.
- Operation of the generator produces heat within the internal components of the generator. Typically, generators are cooled by a cooling medium, such as air, water or hydrogen gas. In the case of hydrogen gas, care must be taken to prevent mixing of the hydrogen gas with the surrounding air to avoid an explosive mixture of hydrogen and oxygen. Typically, hydrogen cooled generators are operated under positive pressure and high hydrogen purity to ensure that a combustible mixture of hydrogen and oxygen does not result within the generator. A hydrogen cooled generator is typically enclosed within a strong shell like frame that can not only support the weight, operational and transient loads of the generator, but also contain the hydrogen gas and prevent it from escaping into the atmosphere where it can form into a combustible mixture.
- There are many locations on the generator where internal components of the generator must penetrate or pass through the frame, such as the rotor and the stationary electrical conductors. Because the rotor must be free to rotate, a sufficient clearance must be provided between the generator frame and an outer surface of the rotor. Typically, a gland seal is provided between the rotor and the frame to prevent the rapid escape of hydrogen gas.
- A gland seal, also known as a hydrogen seal, is well known and functions by forcing a fluid, typically sealing oil, under a pressure greater than that exerted by the opposing hydrogen pressure through a radial gap provided between the rotor and a sealing surface of the gland seal. The sealing oil effectively seals the gap between the rotor and the gland seal thus preventing the leakage of the hydrogen gas and the resultant dangerous mixture of hydrogen and air.
- To effectively seal the generator, the radial gap between the gland seal and the rotor must be as small as practical while leaving sufficient clearance for rotation of the rotor. The diametrical clearance between the gland seal ring and the rotor is proportional to the rotor diameter at the axial location of the gland seal ring and typically is on the order of several thousands of an inch as measured on diameter. Due to the tight radial clearance between the rotor and the gland seal, radial and angular alignment of the gland seal to the rotor is critical. Improper alignment of the gland seal can lead to contact of the rotor with the gland seal causing impermissible wear of the gland seal and/or excessive rotor vibration. Both situations are unacceptable and will likely result in a forced shut down of the generator to remedy the situation.
- The rotor is typically supported at its opposite ends by bearings arranged outside of the gland seals, see
FIG. 1 . Due to the large span between the bearings and the weight of the rotor, the rotor will sag in its middle causing a difference between a theoretical centerline of the machine and an instantaneous centerline of the rotor, seeFIG. 5 . The rotor sag forms an angle between the instantaneous rotor centerline and the theoretical centerline of the machine. If the gland seal is aligned to the theoretical machine centerline, the slope of the rotor at the axial location of the gland seal will result in an inconsistent radial gap from an outboard edge of the gland seal to an inboard edge of the gland seal and from a top to a bottom of the gland seal resulting in uneven pressure and flow of the sealing oil circumferentially around the gland seal. Therefore, the gland seal should advantageously be aligned to the instantaneous angle of the rotor and not to the theoretical rotational centerline. - The orientation of the gland seal is determined by the gland seal housing that supports the gland seal. Furthermore, the orientation of the gland seal housing depends upon an orientation of a mating surface between the gland seal housing and a structural bearing support bracket that the gland seal bracket attaches to.
- The invention is explained in the following description in view of the drawings that show:
-
FIG. 1 is a simplified view of a known electric generator that employs the present invention; -
FIG. 2 is an isometric view of a known gland seal and rotor that employs the present invention; -
FIG. 3 is a cross-sectional view of the gland seal and rotor ofFIG. 2 ; -
FIG. 4 is a view of a pressure bellows; -
FIG. 5 shows the relationship between machine centerline and rotor instantaneous centerline; -
FIG. 6 is a side view ofFIG. 2 with a deflated pressure bellows installed; -
FIG. 7 is a top view ofFIG. 6 ; -
FIG. 8 is a close up view ofFIG. 7 ; -
FIG. 9 shows the system ofFIG. 8 with the pressure bellows inflated; -
FIG. 10 shows the axial measurement of the gland seal. - The present invention is disclosed in context of determining an alignment within an electric generator of an electric power production facility. The principles of the present invention, however, are not limited to use with an electric generator or within an electricity power production facility. For example, the methods and/or systems could be used within the aerospace, transportation or manufacturing industries or any other area where alignment of a slidable seal is needed between a stationary and rotating component. One skilled in the art may find additional applications for the methods, systems, apparatus, and configurations disclosed herein. Thus the illustration and description of the present invention in context of the exemplary electric generator is merely one possible application of the present invention. However the present invention has particular applicability for use as a method for determining an alignment within an electric generator.
- An overview of the invention is provided below followed by a more detailed explanation. Referring to
FIG. 1 , a hydrogen cooledelectric generator 10 typically comprises arotor 20 arranged along acenterline 12 of thegenerator 10. At the ends of thegenerator 10 are bearingbrackets 11 that include bearings that rotatably support therotor 20. - Referring to
FIG. 2 , attached to thebearing bracket 11 is thegland seal bracket 31. The gland seal bracket is removably affixed to thebearing bracket 11 where thegland seal bracket 31 is shown bolted to thebearing bracket 11, however, one skilled in the art will readily appreciate that thegland seal bracket 31 can be fixed to thebearing bracket 11 in any manner suitable to removably affix thegland seal bracket 31 to thebearing bracket 11. Thegland seal bracket 31 has arecess 32 arranged circumferentially around therotor 20. Arranged along an axial face of the recess that is operatively exposed to the hydrogen gas of thegenerator interior 39 is a further circumferential recess orgroove 33. The axial face of the recess opposite thefurther recess 33 is the air side axial face 38 (seeFIGS. 8 through 10 ). - Referring again to
FIG. 2 , therecess 32 is configured to receive and support agland seal 30. Thegland seal 30 is a well known structure forming a ring surrounding therotor 20. Thegland seal 30 may be formed of several segments joined together or may be a unitary ring. However, the particular formation of thegland seal 30 is not determinative to the scope of the present invention and one skilled in the art will readily appreciate that there are many configurations of agland seal 30 that are operative within the scope of the present invention. - Referring to
FIG. 3 , the gland sealinner diameter 35 is slightly greater than the rotorouter diameter 22 to form a radial gap R. The gland seal has internal passages (not shown) running from outer diameter openings onto the inner diameter of thegland seal 35 that operatively provide pressurized oil that fills the radial gap R such that thegland seal 30 rides upon anoil film 34 between the rotor and the gland seal inner diameter and effectively seals-off the radial gap R against the escape of the generator internal hydrogen gas. Thegland seal 30 is rotationally restrained from rotating along with the rotor by anti-rotation pins (not shown) that engage thegland seal 30 and thegland seal bracket 31. - Referring again to
FIG. 2 , the rotor has aradial shoulder 21 arranged at an axial distance from thegland seal 30. Theradial shoulder 21 is formed such that the shoulder is essentially perpendicular to the instantiations centerline of the rotor 13 (seeFIG. 5 ). - Referring to
FIG. 4 , a pressure bellows 40 is a flexible tube like structure having amiddle hose portion 41, a pressure tightclosed end 42 and a selectively sealable and preferably pressuretight connecter 44 arranged at anopen end 43 opposite theclosed end 42. The pressure bellows 40 is sized and configured such that it can be easily inserted into thefurther recess 33 and having an inflated diameter sufficient to expand within thefurther recess 33 and engage thegland seal 30 and secure thegland seal 30 against the recess air side axial face 38 (seeFIGS. 8 and 9 ). The pressure bellows 40 is inventively employed to assist with the proper alignment of thegland seal 30 such that thegland seal 30 effectively seals therotor 20 against the leakage of hydrogen gas. - To effectively seal the radial gap R between the
gland seal 30 and therotor 20, theoil film 34 must exert a force greater than that exerted by the internal hydrogen gas, otherwise the hydrogen gas would blow out theoil film 34 and escape through the radial gap R (seeFIG. 3 ). In order to ensure a consistent radial gap R and therefore a properly sealingoil film 34, the gland sealinner diameter surface 35 must be parallel to the rotorouter diameter surface 22. Direct measurement or verification of the parallelism of the gland sealinner diameter surface 35 and the rotorouter diameter surface 22 is not practical. However, by ensuring that an easily measurable axial face of the gland seal such as the gland seal hydrogen sideaxial face 36 is manufactured essentially perpendicular to the gland sealinner diameter surface 35, and aradial shoulder 21 of the rotor is manufactured essentially perpendicular to theinstantaneous rotor centerline 13 an axial distance can be easily measured to determine that the gland seal hydrogen sideaxial face 36 and theradial shoulder 21 are parallel and therefore inferring that the gland sealinner diameter surface 35 is parallel to the rotor outer diameter surface 22 (seeFIGS. 2 , 5 and 8-10). - In order to achieve accurate results when measuring the axial distance between the gland seal hydrogen side
axial face 36 and theradial shoulder 21, thegland seal 30 should be restrained such that the gland seal air sideaxial face 37 is firmly secured against the recess air side axial face 38 (seeFIGS. 8 and 9 ). - The present invention makes use of an inventive tube like pressure bellows 40 to reliably secure the
gland seal 30 against the recess air side axial face 38 (FIG. 9 ). The deflated pressure bellows 40 is guided into theoil well 33 provided in thegland seal bracket 31, at least partially along a length of the circumferentialfurther recess 33, as seen inFIGS. 6 through 8 . Preferably, a length of pressure bellows 40 is inserted to span at least a 45° arc, more preferably a 90° arc and most preferably a 180° arc or an entirety of thefurther recess 33, however at a minimum, a length of pressure bellows 40 is required such that once inflated, sufficient force is exerted onto thegland seal 30 by the pressure bellows 40 to seat and secure thegland seal 30 against the recess air sideaxial face 38. Once the pressure bellows 40 is in place, the pressure bellowsconnector 44 is attached to a pressurizing device (not shown), for example but not limited to a pump or compressor, to form a selectively sealable and preferably leak tight connection. Once the pressure bellows 40 is pressurized, the pressure bellows 40 expands within thefurther recess 33 and engages thegland seal 30. The internal pressure of the pressure bellows 40 exerts a contact force in the axial direction against thegland seal 30 which urges thegland seal 30 against the recess air sideaxial face 38, seeFIG. 9 . - Feeler gauges can be inserted in the resultant gap between the recess
hydrogen side face 39 and the gland seal hydrogen sideaxial face 36 to verify that thegland seal 30 is properly seated against the recess air sideaxial face 38. - With the pressure bellows 40 inflated and the
gland seal 30 secured and seated against the recess air sideaxial face 38, the axial distance X between the gland seal hydrogen sideaxial face 36 and theradial shoulder 21 as shown inFIG. 10 . By repeating the measurement of the axial distance X, at least three times, a plane defining the surface of the gland seal hydrogen sideaxial face 36 can be determined relative to the rotorradial shoulder 21. Because theradial shoulder 21 is manufactured essentially perpendicular to the rotorinstantaneous centerline 13, and the gland seal hydrogen sideaxial face 36 is manufactured essentially perpendicular to the gland sealinner diameter surface 35 then the parallelism of the gland sealinner diameter surface 35 and the rotorinstantaneous centerline 13 can be inferred. Furthermore, the parallelism of the gland sealinner diameter surface 35 and the rotorinstantaneous centerline 13 can be compared with a predetermined acceptable parallelism value. If the parallelism of the gland sealinner diameter surface 35 and the rotorinstantaneous centerline 13 is determined to be unacceptable, an alignment of thegland seal 30 can be adjusted by adjusting the orientation of thegland seal bracket 31. For example, the mating surface of thegland seal bracket 31 can be machined appropriately to achieve the desired orientation of thegland seal 30. Specifically, when thegland seal 30 is firmly secured against the recess air sideaxial face 38 by the inflated pressure bellows 40 the recess air sideaxial face 38 serves as a control surface that effectively determines the parallelism of the gland sealinner diameter surface 35 and the rotorinstantaneous centerline 13. Therefore, by adjusting the orientation of thegland seal bracket 31 relative to therotor 20 the orientation of thegland seal 30 and ultimately the parallelism of the gland sealinner diameter surface 35 to the rotorinstantaneous centerline 13 can be adjusted. - While various embodiments of the present invention have been shown and described herein, it will be obvious that such embodiments are provided by way of example only. Numerous variations, changes and substitutions may be made without departing from the invention herein. Accordingly, it is intended that the invention be limited only by the spirit and scope of the appended claims.
Claims (17)
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