CN114483320A - Supporting assembly for supporting central rotating shaft and central rotating shaft assembly - Google Patents
Supporting assembly for supporting central rotating shaft and central rotating shaft assembly Download PDFInfo
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- CN114483320A CN114483320A CN202210326105.0A CN202210326105A CN114483320A CN 114483320 A CN114483320 A CN 114483320A CN 202210326105 A CN202210326105 A CN 202210326105A CN 114483320 A CN114483320 A CN 114483320A
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- 230000006835 compression Effects 0.000 claims description 37
- 238000007906 compression Methods 0.000 claims description 37
- 230000000712 assembly Effects 0.000 claims description 19
- 238000000429 assembly Methods 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 abstract description 13
- 230000005489 elastic deformation Effects 0.000 description 6
- 230000001052 transient effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/20—Mounting or supporting of plant; Accommodating heat expansion or creep
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/06—Arrangements of bearings; Lubricating
Abstract
The invention discloses a supporting assembly for supporting a central rotating shaft in a gas turbine, wherein a front-stage wheel disc (7) and a rear-stage wheel disc (8) are axially assembled on the central rotating shaft (1), the supporting assembly comprises a supporting body and an adjusting assembly for adjusting the rigidity of the supporting body, the supporting body is supported between the front-stage wheel disc (7) and the rear-stage wheel disc (8), and the adjusting assembly is movably connected with the supporting body. When the frequency of the central rotating shaft (1) does not meet the requirement, the adjusting assembly can be adjusted to enable the supporting assembly to be elastically deformed, so that the rigidity of the supporting assembly is adjusted, the frequency of the central rotating shaft (1) is adjusted, and the vibration amplitude of the central rotating shaft (1) is reduced to meet the dynamic requirement of the gas turbine in the testing or running process.
Description
Technical Field
The invention relates to a heavy-duty gas turbine, in particular to a central rotating shaft radial support assembly of the heavy-duty gas turbine.
Background
The central rotating shaft of the gas turbine is an important part of a rotor system and is used for bearing a gas compressor wheel disc and a turbine wheel disc. The center pivot both ends are supported by preceding spindle nose, back spindle nose, and the center pivot span is great, and in the axial direction, need set up radial supporting component in different positions to support and frequency modulation to the center pivot.
The supporting component in the prior art is matched with the distance ring to radially support the central rotating shaft. The distance ring and preceding stage rim plate draw-in groove department adopt interference fit usually, and in the combustion engine started and stopped the circulation, because transient deformation's influence, there was contact zone stress too big distance ring and preceding stage rim plate draw-in groove, also had the risk that distance ring and preceding stage rim plate draw-in groove became invalid.
In addition, after finishing the finish machining of the supporting structure in the prior art, the rigidity of the supporting structure cannot be adjusted. The gas turbine has the problems that the supporting structure cannot effectively support the central rotating shaft in the testing or running process, so that the vibration amplitude of the central rotating shaft is overlarge and the like. In order to solve the problem of overlarge vibration amplitude of the central rotating shaft, the rigidity and the interference magnitude of the supporting assembly need to be adjusted. Aiming at the existing supporting assembly, the wheel disc and the central rotating shaft can only be redesigned, the size is modified and evaluated, and the supporting assembly and even the central rotating shaft still need to be scrapped in severe cases.
The present invention has been made in view of the above problems.
Disclosure of Invention
The invention mainly aims to provide a support assembly capable of adjusting the rigidity of a support central rotating shaft so as to solve the problem that the vibration amplitude of the central rotating shaft is overlarge in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a support assembly for supporting a central rotating shaft, the central rotating shaft being axially provided with a preceding stage wheel disc and a following stage wheel disc, the support assembly including a support body supported between the preceding stage wheel disc and the following stage wheel disc and an adjusting assembly for adjusting rigidity of the support body, the adjusting assembly being movably connected to the support body. When the frequency of the central rotating shaft does not meet the requirement, the adjusting assembly can be adjusted to enable the supporting assembly to be elastically deformed, so that the rigidity of the supporting assembly is adjusted, the frequency of the central rotating shaft is adjusted, and the vibration amplitude of the central rotating shaft is reduced to meet the dynamic requirement of the gas turbine in the testing or running process.
The following is a further optimization of the present invention to the above scheme:
further, the support body comprises a first fixed end, a second fixed end and a support end, and the first fixed end, the support end and the second fixed end form a U-shaped opening. The support body adopts the integrated design, compares with conventional use distance ring and preceding stage rim plate draw-in groove interference fit, and the integrated design of support body has eliminated the circulation in-process that gas turbine started or stopped, because the problem of the too big, the structural failure of stress of distance ring and preceding stage rim plate draw-in groove contact zone that transient deformation caused.
Furthermore, the first fixed end is connected with a first clamping groove of the front-stage wheel disc in a clamped mode, the second fixed end is connected with a second clamping groove of the rear-stage wheel disc in a clamped mode, and the supporting end is supported on the central rotating shaft.
Further, the rigidity of the support body is adjustable.
Further, the support end is in contact with the central rotating shaft to radially support the central rotating shaft.
Further, the adjusting component is a rigid adjusting piece.
Further, the rigidity adjusting member includes a first adjusting lever and an anti-loose member.
Further, the anti-loosening element is an anti-loosening gasket and/or an anti-loosening steel wire.
Furthermore, the first adjusting rod is a first anti-rotation adjusting rod which penetrates through the supporting end and is pressed on the side surface of the first fixed end through the anti-loosening piece. When the rigidity of the supporting assembly is adjusted, the gap is adjusted by adjusting the screwing number of turns of the first anti-rotation adjusting rod so as to adjust the effective supporting length of the first anti-rotation adjusting rod, so that the U-shaped opening generates different elastic deformations, and the purpose of adjusting the rigidity of the first supporting body and the supporting interference of the supporting assembly and the central rotating shaft is achieved. The supporting component only needs to adjust the rigidity of the first supporting body to adjust the frequency of the central rotating shaft, solves the problem of overlarge vibration amplitude of the central rotating shaft, and overcomes the defect that the supporting component is reprocessed to change the supporting rigidity in the prior art.
Furthermore, the first adjusting rod is a first perforated adjusting rod which penetrates through the first fixed end and presses on the side surface of the supporting end. The adjustment clearance is located the position of keeping away from central pivot, need not demolish preceding stage rim plate, back stage rim plate and fourth support body, but direct adjustment clearance to reach the purpose of swift adjustment rigidity. And the parts of the rigidity adjusting piece are fewer, and the structure is simple.
Furthermore, the head of the first hole-in-hole adjusting rod is provided with a through hole, and the anti-loosening steel wire penetrates through the two or more through holes to prevent the support assembly from loosening.
Further, the adjusting component is an elastic adjusting piece.
Furthermore, the elastic adjusting piece comprises a second adjusting rod, a pressing cushion block and a compression spring, and the second adjusting rod is arranged in the U-shaped opening through the pressing cushion block and the compression spring.
Furthermore, the elastic adjusting piece further comprises an anti-loosening piece, the second adjusting rod is a second anti-rotation adjusting rod, the second anti-rotation adjusting rod penetrates through the supporting end, and the compression spring is pressed on the side surface of the first fixed end through the anti-loosening piece and the compression cushion block. The rigidity of the supporting component can be adjusted through the compression amount of the compression spring, the rigidity adjustment is softer, the supporting structure body is not easy to damage, and the structure is relatively complex.
Furthermore, the second is adjusted the pole for the foraminiferous regulation of second, and the foraminiferous regulation pole of second passes first stiff end, presses compression spring on the side surface of supporting the end through compressing tightly the cushion. The rigidity of the supporting component can be adjusted through the compression amount of the compression spring, the rigidity adjustment is softer, and the supporting structure body is not easy to damage. And because of adjusting the position that the clearance is located and keeping away from central pivot, the adjustment of adjusting the clearance has more spaces, does not demolish preceding stage rim plate, back stage rim plate and third support body, also directly adjusts the clearance to reach the purpose of adjustment supporting component rigidity, make the accommodation process of support rigidity more convenient.
Further, the support body is designed with a counter bore for accommodating the head of the second adjusting rod.
According to another aspect of the present invention, there is provided a central rotating shaft assembly, comprising a plurality of supporting assemblies, wherein the supporting assemblies are arranged on the circumference of the central rotating shaft and are in interference fit with the central rotating shaft, the adjusting assemblies and the supporting body are provided with adjusting gaps, and the adjusting gaps are adjusted to adjust the distance between the upper side surfaces of the U-shaped openings and the lower side surfaces of the U-shaped openings of the plurality of supporting assemblies, so as to adjust the rigidity of the supporting body, change the pressing force of the supporting assemblies on the central rotating shaft, thereby adjusting the frequency of the central rotating shaft, and solve the problem of too large vibration amplitude of the central rotating shaft.
According to the support assembly, the U-shaped opening of the support body is elastically deformed by adjusting the screwing number of turns of the internal support bolt and the effective support length of the support bolt, so that the radial rigidity of the support assembly is adjusted. The supporting component realizes the rigidity adjustment of the supporting component through the internal adjusting component, so that the frequency of the central rotating shaft is adjusted, the vibration amplitude is reduced, the dynamic requirement of the gas turbine in the testing or running process is met, and the rigidity of the supporting component can be adjusted without reworking the supporting component. Meanwhile, the support body adopts an integrated design, a distance ring is omitted, and the risk of failure of the distance ring and a clamping groove of a preceding-stage wheel disc in the starting and stopping processes of the gas turbine is eliminated. In addition, the central rotating shaft assembly provided by the invention can adjust the rigidity of the plurality of supporting assemblies by adjusting the adjusting gap X, and change the interference magnitude between the supporting assemblies and the central rotating shaft, so that the frequency of the central rotating shaft is adjusted, and the problem of overlarge vibration amplitude of the central rotating shaft is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 illustrates a schematic view of a central spindle radial support assembly according to the present invention; and
FIG. 2 shows a schematic view according to the B direction shown in FIG. 1; and
FIG. 3 illustrates an assembly view of the central spindle radial support assembly according to the present invention; and
FIG. 4 shows a schematic partial A-A cross-sectional view of a support assembly according to embodiment 1 of the present invention; and
FIG. 5 shows a schematic partial A-A cross-sectional view of a support assembly according to embodiment 2 of the present invention; and
FIG. 6 shows a schematic partial A-A cross-sectional view of a support assembly according to embodiment 3 of the present invention; and
figure 7 shows a schematic partial a-a cross-sectional view of a support assembly according to embodiment 4 of the present invention.
Wherein the figures include the following reference numerals:
1. a central rotating shaft; 2. pressing the cushion block; 3. a through hole; 4. fastening a nut; 5. a lock washer; 6. a compression spring; 7. a preceding stage wheel disc; 8. a rear wheel disc; 9. a first card slot; 10. a second card slot;
11. a first anti-rotation adjusting rod; 12. a first perforated adjustment lever; 13. a second anti-rotation adjusting rod; 14. the second adjusting rod with holes.
21. A first fixed end; 22. a second fixed end; 23. a support end; 24. a first support body; 25. a second support body; 26. a third support body; 27. a fourth support body;
x, adjusting the gap; C. the upper side surface of the U-shaped opening; D. the lower side of the U-shaped opening.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The present invention is described in further detail below with reference to specific examples, which are not to be construed as limiting the scope of the invention as claimed. The term "comprising" when used indicates the presence of a feature but does not preclude the presence or addition of one or more other features; the terms "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description only, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting; furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The gas turbine central rotating shaft 1 bears a compressor wheel disc and a turbine wheel disc, and radial supporting components are required to be arranged at different axial positions in operation so as to adjust the frequency of the central rotating shaft 1. The invention provides a supporting assembly, wherein the rigidity of the supporting assembly can be adjusted through an internal adjusting assembly, and then the frequency of a central rotating shaft 1 is adjusted to reduce the vibration amplitude.
As shown in fig. 1 to 4, a support assembly supporting the central rotating shaft is disposed in a circumferential direction of the central rotating shaft 1. The central rotating shaft 1 is axially provided with a front-stage wheel disc 7 and a rear-stage wheel disc 8. The support assembly comprises a support body and an adjusting assembly, and the adjusting assembly adjusts the rigidity of the support body. The supporting body is supported between the front-stage wheel disc 7 and the rear-stage wheel disc 8, the adjusting assembly is movably connected with the supporting body, and when the frequency of the central rotating shaft 1 does not meet the requirement, the adjusting assembly can be adjusted to enable the supporting assembly to elastically deform, so that the rigidity of the supporting assembly is adjusted, the frequency of the central rotating shaft 1 is adjusted, and the vibration amplitude of the central rotating shaft 1 is reduced to meet the dynamic requirement of the gas turbine in the testing or running process.
The supporting body is integrally designed and comprises a first fixing end 21, a second fixing end 22 and a supporting end 23. Compared with the conventional interference assembly of the distance ring and the clamping groove of the front-stage wheel disc 7, the integrated design of the support body eliminates the problems of overlarge stress and structural failure of the contact area of the distance ring and the clamping groove of the front-stage wheel disc 7 caused by transient deformation in the starting or stopping circulation process of the gas turbine. The first fixing end 21 and/or the second fixing end 22 are plate-shaped bosses. The support end 23 is provided with a flat boss which contacts the central rotating shaft 1 to radially support the central rotating shaft 1. The support body is arranged between the front-stage wheel disc 7 and the rear-stage wheel disc 8, and the front-stage wheel disc 7 and the rear-stage wheel disc 8 are respectively provided with a first clamping groove 9 and a second clamping groove 10. The first fixed end 21 is clamped with the first clamping groove 9 of the front-stage wheel disc 7, and the second fixed end 22 is clamped with the second clamping groove 10 of the rear-stage wheel disc 8. The rigidity of the supporting body is adjustable, and the first fixing end 21, the supporting end 23 and the second fixing end 22 form a U-shaped opening.
The plurality of supporting components are uniformly fixed between the first clamping groove 9 of the front-stage wheel disc 7 and the second clamping groove 10 of the rear-stage wheel disc 8 along the circumferential direction of the central rotating shaft 1, and support the central rotating shaft 1 together.
The supporting body and the adjusting component are provided with an adjusting gap X, and the distance between the upper side surface C of the U-shaped opening and the lower side surface D of the U-shaped opening is adjusted by adjusting the value of the adjusting gap X so as to adjust the rigidity of the supporting body. Wherein, the setting of adjusting part is comparatively nimble, and adjusting part can set up to rigidity adjusting part or elasticity adjusting part. The adjustment gap X of the support assembly may be provided at a position adjacent to the central rotation axis 1 or at a position distant from the central rotation axis 1. The adjusting assembly can be set as a rigid adjusting piece or an elastic adjusting piece, and the gap X can be adjusted through the rigid adjusting piece and the elastic adjusting piece or through the cooperation of the rigid adjusting piece and the elastic adjusting piece. The specific value of the adjusting gap X is designed according to different rigidity requirements, and different gas turbine units have different rigidity requirements. Because of a plurality of supporting components set up in central pivot 1 circumferencial direction, and with 1 interference fit of central pivot, adjust the interference magnitude of a plurality of supporting components and central pivot 1 of a plurality of supporting components's adjustable clearance X.
According to the first embodiment of the present invention, a supporting assembly is provided, in which the adjusting assembly is a rigid adjusting member, and the adjusting gap X is located near the central rotating shaft 1.
The rigidity adjusting piece adopted by the first embodiment comprises a first adjusting rod and an anti-loosening piece. As shown in fig. 1 and 4, the locking piece includes a fastening nut 4 and a locking washer 5, and the locking piece may also be provided with a structure capable of playing a locking effect, such as a double nut and a locking nut. The first adjustment rod in the first embodiment is a first anti-rotation adjustment rod 11, which includes a head portion and a rod portion, wherein the head portion is of an oblong design, a rectangular design, and the like.
As shown in fig. 1, the first supporting body 24 includes a first fixing end 21, a second fixing end 22 and a supporting end 23, the first fixing end 21 is matched with the first slot 9 of the front-stage wheel disc 7, the second fixing end 22 is matched with the second slot 10 of the rear-stage wheel disc 8, and the supporting end 23 supports the central rotating shaft 1. The first fixing end 21 and the supporting end 23 are formed with approximately U-shaped openings having a U-shaped opening upper side C and a U-shaped opening lower side D, wherein the U-shaped opening upper side C and the U-shaped opening lower side D are respectively provided with bosses having a higher flatness. The boss of U-shaped opening downside D is used for placing locking gasket 5, the boss of U-shaped opening upper flank C is used for bearing first 11 pole portion terminal surfaces of adjusting pole of preventing changeing. The U-shaped opening can be elastically deformed to adjust the rigidity on the one hand and also provides installation space for tightening the fastening nut 4 on the other hand.
The support end 23 of the first support body 24 is provided with a counter bore for accommodating the oblong or rectangular head of the first anti-rotation adjusting rod 11, the counter bore is also in oblong design, rectangular design and the like, and the design can prevent the first anti-rotation adjusting rod 11 from loosening so as to prevent the first anti-rotation adjusting rod 11 from loosening caused by vibration in the working process of the gas turbine. The first anti-rotation adjustment lever 11 passes through the support end 23 and is pressed against the side surface of the first fixing end 21 by the anti-loosening member.
The adjusting clearance X is located at a position close to the central rotating shaft 1 and is a clearance between the top surface of the head of the first anti-rotation adjusting rod 11 and the top surface of the counter bore of the supporting end 23. The rigidity adjusting piece adjusts the effective supporting length of the first anti-rotation adjusting rod 11 by adjusting the adjusting gap X, so that the U-shaped openings of the first fixing end 21 and the supporting end 23 are elastically deformed. This design allows the stiffness of the support assembly to be adjusted without reworking the support assembly.
Before the support assembly is assembled with the front-stage wheel disc 7, the rear-stage wheel disc 8 and the central rotating shaft 1, the support assembly needs to be preassembled, wherein the support assembly comprises a first support body 24, a first anti-rotation adjusting rod 11, a locking gasket 5 and a fastening nut 4. As shown in fig. 4, the head of the first anti-rotation adjusting rod 11 is disposed at the side of the central rotating shaft 1, the rod of the first anti-rotation adjusting rod 11 passes through the counter bore of the supporting end 23 and the through hole of the supporting end 23, and then the anti-loosening gasket 5 is sleeved on the rod and the fastening nut 4 is screwed in. The other end of the first anti-rotation adjusting rod 11 is supported on the boss of the upper side surface C of the U-shaped opening. When the support component is preassembled, the fastening nut 4 is only required to be taken, and the support component does not need to be screwed.
After the supporting component is preassembled, the front-stage wheel disc 7, the central rotating shaft 1 and the supporting component are sequentially installed, the first fixed end 21 of the supporting component is inserted into the first clamping groove 9, the rear-stage wheel disc 8 is installed, the second clamping groove 10 of the rear-stage wheel disc 8 is clamped into the second fixed end 22, and then the fastening nut 4 is rotated, and the value of the adjusting gap X is adjusted.
When adjusting the supporting component rigidity, need to adjust first commentaries on classics regulation pole 11 and screw up the number of turns and adjust clearance X to adjust the effective support length of first commentaries on classics regulation pole 11, with the distance of adjusting U type opening upper flank C and U type opening downside D, make the U-shaped opening produce different elastic deformation, reach the purpose of adjusting the first rigidity that supports body 24, supporting component and central pivot 1 support magnitude of interference. The supporting component only needs to adjust the rigidity of the first supporting body 24 to solve the problem that the vibration amplitude of the central rotating shaft 1 is overlarge, and the defect that the supporting component is machined again to change the supporting rigidity in the past is overcome.
The second embodiment of the present invention provides a supporting component in which the adjusting component is an elastic adjusting component, and the adjusting gap X is located near the central rotating shaft 1.
The second embodiment changes the adjusting mode of the adjusting component on the basis of the first embodiment. The adjusting assembly is an elastic adjusting piece and comprises a second adjusting rod, a pressing cushion block 2 and a compression spring 6, and the second adjusting rod is arranged in the U-shaped opening through the pressing cushion block 2 and the compression spring 6. The second adjustment lever in the second embodiment is a second anti-rotation adjustment lever 13, comprising a head and a lever, the head being of oblong design to prevent loosening of the lever. The second anti-rotation adjustment rod passes through the support end 23 and presses the compression spring 6 against the side surface of the first fixed end 21 via the anti-loosening element, the pressure pad 2.
The both ends that compress tightly cushion 2 all are provided with the annular groove, and one end is used for supporting the second and prevents changeing the pole portion terminal surface of adjusting pole 13, and the other end is used for holding compression spring 6's one end. The U-shaped open upper side C of the second support body 25 of the corresponding second embodiment is also provided with an annular groove for accommodating the other end of the compression spring 6. The total height of the pressure pad 2 and the annular groove provided in the support body is 1/6-1/4 of the total height of the compression spring 6, so as to ensure that the compression spring 6 does not have unstable position during the operation of the gas turbine.
The adjustment clearance X is still the clearance between the second anti-rotation adjustment rod 13 and the counter bore top surface of the support end 23. By adjusting the screwing quantity of the second anti-rotation adjusting rod 13 and the screwing size of the gap X, the compression spring 6 generates different elastic deformations, and the purposes of adjusting the rigidity of the supporting component and the interference magnitude of the supporting component and the central rotating shaft 1 are achieved.
Before the supporting component is assembled with the front-stage wheel disc 7, the rear-stage wheel disc 8 and the central rotating shaft 1, the supporting component needs to be preassembled. As shown in fig. 5, the head of the second adjusting rod is disposed at the side of the central rotating shaft 1, the rod of the second anti-rotation adjusting rod 13 is inserted through the counter bore and the through hole of the supporting end 23 of the second supporting body 25, and then the anti-rotation adjusting rod is sleeved with the anti-rotation spacer 5 and the fastening nut 4 is screwed. The other end of the second anti-rotation adjusting lever 13 is supported on the pressing pad 2 to press the compression spring 6 between the pressing pad 2 and the second support body 25. The compression spring 6 is installed in an annular groove between the pressing pad 2 and the second support body 25. After the support assembly is preassembled, a front-stage wheel disc 7, a central rotating shaft 1, the support assembly and a rear-stage wheel disc 8 are sequentially installed.
When the rigidity of the supporting component needs to be adjusted, the screwing quantity of the second anti-rotation adjusting rod 13 and the size of the adjusting gap X are adjusted, so that the compression spring 6 generates different elastic deformations, and the purposes of adjusting the rigidity of the supporting component and the interference magnitude of the supporting component and the central rotating shaft 1 are achieved. The rigidity of the supporting component of the second embodiment can be adjusted through the compression amount of the compression spring 6, the rigidity adjustment is softer, the supporting structure body is not easy to damage, and the structure is relatively complex.
In the support assembly provided by the third embodiment of the present invention, the adjusting assembly is an elastic adjusting member, and the adjusting gap X is located at a position far away from the central rotating shaft 1.
Embodiment three is based on embodiment two, has changed the position of adjusting clearance X. The adjusting component is an elastic adjusting piece and comprises a second adjusting rod, a pressing cushion block 2 and a compression spring 6. The second adjustable rod of the third embodiment is a second perforated adjustable rod 14. The second perforated adjusting rod 14 is matched with the pressing cushion block 2 and the compression spring 6 to adjust the rigidity of the supporting component. The head of the second adjusting rod with hole 14 is arranged at a position far away from the central rotating shaft 1, the rod part passes through the first fixed end 21, and the compression spring 6 is pressed on the side surface of the supporting end 23 through the pressing cushion block 2. The pressure pad 2 has an upper and a lower groove, the upper groove is used for supporting the second adjusting rod, and the lower groove is used for limiting the top surface of the compression spring 6. The compression spring 6 is arranged between the pressure pad 2 and the annular recess of the U-shaped open underside D of the third support body 26.
The U-shaped open underside D of the third support body 26 in the third embodiment is also provided with an annular recess for accommodating the other end of the compression spring 6. The upper side C of the U-shaped opening of the third support body 26 is provided with a threaded hole for screw-fitting with the rod portion of the second adjustment rod.
Before the supporting component is assembled with the front-stage wheel disc 7, the rear-stage wheel disc 8 and the central rotating shaft 1, the supporting component needs to be preassembled, the rod part of the second adjusting rod penetrates through the threaded hole of the third supporting body 26, the head part of the second adjusting rod is arranged on the opposite side of the central rotating shaft 1, and the end face of the rod part is supported on the pressing cushion block 2. The compression spring 6 is mounted in an annular groove between the pressure pad 2 and the third support body 26. After the support assembly is preassembled, a front-stage wheel disc 7, a central rotating shaft 1, the support assembly and a rear-stage wheel disc 8 are sequentially installed.
The adjusting gap X is located on the opposite side of the central rotating shaft 1, when the rigidity of the supporting component needs to be adjusted, the screwing number of the second adjusting rod with holes 14 and the size of the adjusting gap X are adjusted, so that the compression spring 6 generates different elastic deformations, and the purposes of adjusting the rigidity of the supporting component and the interference magnitude of the supporting component and the central rotating shaft 1 are achieved. The head of the second adjusting rod with holes 14 is provided with 1 through hole 3, and the two second adjusting rods with holes 14 of every two groups of supporting components can be locked by steel wires during installation, so that the second adjusting rods are prevented from loosening. The supporting rigidity of the three supporting assemblies of the embodiment can be adjusted through the compression amount of the compression spring 6, the adjusting rigidity is softer, and the supporting structure body is not easy to damage.
Because the adjusting clearance X is positioned at a position far away from the central rotating shaft, the adjusting of the adjusting clearance X has more space, the fore-stage wheel disc 7, the rear-stage wheel disc 8 and the third supporting body 26 are not dismounted, and the clearance X is also directly adjusted to achieve the purpose of adjusting the rigidity of the supporting assembly, so that the adjusting process of the supporting rigidity is more convenient, but the looseness prevention of the supporting assembly needs to be bound by steel wires.
In the supporting assembly provided by the fourth embodiment of the present invention, the adjusting assembly is a rigid adjusting member, and the adjusting gap X is on the opposite side of the central rotating shaft 1.
Example four on the basis of example three, a rigidity adjusting member was used. The rigid adjustment member includes a first adjustment lever. The head of the first adjusting lever is arranged at a position far away from the central rotating shaft 1, and the other end of the first adjusting lever is supported on the lower side surface D of the U-shaped opening of the fourth supporting body 27.
In the fourth embodiment, the upper side C of the U-shaped opening of the fourth supporting body 27 is provided with a threaded hole for screw-fitting with the rod portion of the first adjusting rod. The first adjusting rod is a first perforated adjusting rod 12, and the first perforated adjusting rod 12 passes through the first fixing end 21 and presses on the side surface of the supporting end 23.
When the rigidity of the support assembly needs to be adjusted, the fourth support body 27 generates different elastic deformations by adjusting the screwing number of the first perforated adjusting rod 12 and the screwing size of the gap X, so that the purposes of adjusting the rigidity of the fourth support body 27 and the interference magnitude between the support assembly and the central rotating shaft 1 are achieved. The head of the first perforated adjusting rod 12 is provided with a through hole 3, and the anti-loosening steel wire penetrates through the through holes 3 of two or more first perforated adjusting rods 12 to prevent the rigidity adjusting piece from loosening. Because the adjustment gap X is located at a position far away from the central rotating shaft 1, in the fourth embodiment, the gap X can be directly adjusted without dismantling the front-stage wheel disc 7, the rear-stage wheel disc 8 and the fourth supporting body 27, so that the purpose of quickly adjusting the rigidity is achieved. The four rigid adjusting parts of the embodiment have fewer parts and simple structure, but are anti-loose and need to be bound by steel wires.
The invention also provides a central rotating shaft assembly, which comprises a central rotating shaft 1 and a plurality of supporting assemblies arranged on the circumference of the central rotating shaft 1, wherein the supporting assemblies arranged on the circumference of the central rotating shaft 1 are in interference fit with the central rotating shaft 1, the adjusting assemblies and the supporting body are provided with adjusting gaps X, and the adjusting gaps X are adjusted to adjust the distance between the upper side C of the U-shaped openings and the lower side D of the U-shaped openings of the supporting assemblies, so as to adjust the rigidity of the supporting body and change the pressing force of the supporting assemblies on the central rotating shaft, thereby adjusting the frequency of the central pull rod and solving the problem of overlarge vibration amplitude of the central rotating shaft.
According to the support assembly, the U-shaped opening of the support body is elastically deformed by adjusting the screwing number of turns of the internal support bolt and the effective support length of the support bolt, so that the radial rigidity of the support assembly is adjusted. The supporting component realizes the rigidity adjustment of the supporting component through the internal adjusting component, so that the frequency of the central rotating shaft 1 is adjusted, the vibration amplitude is reduced, the dynamic requirement of the gas turbine in the testing or running process is met, and the rigidity of the supporting component can be adjusted without reworking the supporting component. Meanwhile, the support body adopts an integrated design, a distance ring is omitted, and the risk of failure of the distance ring and a clamping groove of a preceding-stage wheel disc in the starting and stopping processes of the gas turbine is eliminated. In addition, the interference magnitude between the plurality of supporting assemblies and the central rotating shaft 1 can be adjusted by adjusting the adjusting gap X, so that the frequency of the central pull rod is adjusted, and the problem of overlarge vibration amplitude of the central rotating shaft is solved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. The utility model provides a support assembly for supporting central pivot, central pivot (1) is equipped with preceding stage rim plate (7) and back stage rim plate (8) on the axial, its characterized in that, support assembly is including supporting body (24, 25, 26, 27) and being used for the adjustment support body (24, 25, 26, 27) rigidity's adjusting part, support body (24, 25, 26, 27) support and be in preceding stage rim plate (7) with between back stage rim plate (8), adjusting part with support body (24, 25, 26, 27) swing joint.
2. The support assembly according to claim 1, characterized in that the support body (24, 25, 26, 27) comprises a first fixed end (21), a second fixed end (22) and a support end (23), the first fixed end (21) forming a U-shaped opening with the support end (23) and the second fixed end (22).
3. The support assembly according to claim 2, wherein the first fixing end (21) is clamped with a first clamping groove (9) of the front stage wheel disc (7), the second fixing end (22) is clamped with a second clamping groove (10) of the rear stage wheel disc (8), and the support end (23) is supported on the central rotating shaft (1).
4. The support assembly according to claim 2, characterized in that the support body (24, 25, 26, 27) is adjustable in stiffness.
5. The support assembly according to claim 4, characterized in that the support end (23) is in contact with the central rotary shaft (1) to radially support the central rotary shaft (1).
6. The support assembly of claim 2, wherein the adjustment assembly is a rigid adjustment member.
7. Support assembly according to claim 6, wherein said rigid adjustment means comprise a first adjustment lever (11, 12) and an anti-loosening means.
8. Support assembly according to claim 7, wherein the anti-loosening element is an anti-loosening shim (5) and/or an anti-loosening steel wire.
9. Support assembly according to claim 7, wherein said first adjustment lever (11, 12) is a first anti-rotation adjustment lever (11), said first anti-rotation adjustment lever (11) passing through said support end (23) and being pressed by said check member against the lateral surface of said first fixed end (21).
10. Support assembly according to claim 7, wherein said first adjustment lever (11, 12) is a first perforated adjustment lever (12), said first perforated adjustment lever (12) passing through said first fixed end (21) pressing on the lateral surface of said support end (23).
11. The support assembly according to claim 10, characterized in that the head of the first holed adjusting rod (12) is provided with a through hole (3), the anti-loosening steel wire passing through two or more of said through holes (3) to prevent the support assembly from loosening.
12. The support assembly of claim 6, wherein the adjustment assembly is a resilient adjustment member.
13. The support assembly according to claim 12, characterized in that the resilient adjustment member comprises a second adjustment lever (13, 14), a pressure pad (2), a compression spring (6), the second adjustment lever (13, 14) being arranged in a U-shaped opening through the pressure pad (2), the compression spring (6).
14. The support assembly according to claim 13, characterized in that said elastic adjustment means further comprise an anti-loosening means, said second adjustment lever (13, 14) being a second anti-rotation adjustment lever (13), said second anti-rotation adjustment lever (13) passing through said support end (23), said compression spring (6) being pressed against the side surface of said first fixed end (21) by said anti-loosening means, said pressing pad (2).
15. The support assembly according to claim 13, wherein the second adjustment lever (13, 14) is a second holed adjustment lever (14), the second holed adjustment lever (15) passing through the first fixed end (21), the compression spring (6) being pressed against the lateral surface of the support end (23) by the pressure pad (2).
16. Support assembly according to claim 13, characterized in that the support body (24, 25, 26, 27) is designed with a counter bore which accommodates the second adjusting rod head.
17. A central rotating shaft assembly comprising a plurality of supporting assemblies as claimed in any one of claims 1 to 16, wherein a plurality of said supporting assemblies arranged on the circumference of said central rotating shaft (1) are in interference fit with said central rotating shaft (1), said adjusting assemblies and said supporting bodies (24, 25, 26, 27) are provided with adjusting gaps, said adjusting gaps are adjusted to adjust the distance between the upper side of the U-shaped openings and the lower side of the U-shaped openings of said plurality of supporting assemblies, so as to adjust the rigidity of the supporting bodies (24, 25, 26, 27) and change the pressing force of the supporting assemblies on the central rotating shaft (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210326105.0A CN114483320A (en) | 2022-03-30 | 2022-03-30 | Supporting assembly for supporting central rotating shaft and central rotating shaft assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210326105.0A CN114483320A (en) | 2022-03-30 | 2022-03-30 | Supporting assembly for supporting central rotating shaft and central rotating shaft assembly |
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| CN114483320A true CN114483320A (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210326105.0A Pending CN114483320A (en) | 2022-03-30 | 2022-03-30 | Supporting assembly for supporting central rotating shaft and central rotating shaft assembly |
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