CN109707778B - Nonlinear elastic impact-resistant limiter of propulsion type gas turbine device - Google Patents
Nonlinear elastic impact-resistant limiter of propulsion type gas turbine device Download PDFInfo
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- 238000002955 isolation Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 238000013016 damping Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 16
- 230000004044 response Effects 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 12
- 239000005060 rubber Substances 0.000 claims description 12
- 239000004677 Nylon Substances 0.000 claims description 11
- 229920001778 nylon Polymers 0.000 claims description 11
- 230000001133 acceleration Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- 230000035939 shock Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
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- 238000001125 extrusion Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 230000005489 elastic deformation Effects 0.000 claims 1
- 238000004880 explosion Methods 0.000 abstract description 4
- 230000003139 buffering effect Effects 0.000 description 7
- 239000002131 composite material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
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- 238000005265 energy consumption Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The invention relates to a nonlinear elastic impact-resistant limiter of a propulsion type gas turbine device, which relates to the field of gas turbines and mainly aims to solve the problems that the vertical, horizontal and longitudinal explosion-resistant impact limiting displacement of the gas turbine device cannot be realized, an elastic shaft is protected and flexible connection is realized in the prior art.
Description
Technical Field
The invention relates to the field of gas turbines, in particular to a nonlinear elastic impact-resistant limiter of a propulsion type gas turbine device.
Background
With the continuous improvement of the impact resistance of the gas turbine by the ship operation, the gas turbine device is required to maintain and quickly recover the viability and the fight capacity under the impact of far-field non-contact and near-field contact explosion. According to the military standard, the impact resistance level of the gas turbine device belongs to class A equipment, the performance of the equipment is not changed obviously before and after impact, and other damages are not caused. Under the action of explosion impact, the dynamic and static structures are rubbed, the blades are broken, the structures of the accessories of the combustion engine are broken, and the like. With the transition of naval strategies from offshore defense to offshore defense and offshore defending, the use of ship engines is more frequent, the working conditions are worse, and the ship engines face challenges of more complex and severe offshore special natural environments and combat environments.
The novel isolation system limiter not only requires that the gas turbine device does not influence the vibration isolation performance under the normal working state, but also limits impact displacement under the impact load condition, meets the requirement of impact response, and protects the propulsion type gas turbine device to still normally operate in the environment. In the early-middle stage of the impact process, the gas turbine vibration damper is used for damping through a rubber main body structure and absorbing initial impact load energy, and is used for bearing main buffering of deformation of a gas turbine isolation system, and along with accumulation of the impact energy, after an initial small deformation range, a limiter is used for limiting impact displacement of a gas turbine device, so that a connecting structure is protected, and vertical, transverse and longitudinal acceleration response and displacement response of the gas turbine device are affected; therefore, the novel limiter has smaller rigidity under the condition of small amplitude so as to meet the vibration reduction requirement; the nonlinear elastic element material has the characteristics that the elastic force is increased in a nonlinear way along with the increase of deformation, has larger damping and energy consumption characteristics, has smaller rigidity characteristic in the initial stage, does not influence vibration isolation performance, provides larger nonlinear elasticity-damping impact buffering counter force for the middle-later stage of deformation of an isolation system, and limits the maximum displacement. Under the condition of different impact energy loads in the vertical direction, the transverse direction and the longitudinal direction, various composite elastic and damping elements act step by step to absorb the loss impact energy. The vertical, transverse and longitudinal limiting functions are required to be achieved in design, the structural space is limited, and the nonlinear rigidity and damping performance of the elastic impact element are required to be adjusted so as to achieve indexes for limiting the three-way impact response and impact displacement of the gas turbine. The invention designs the nonlinear elastic impact-resistant limiter of the gas turbine device aiming at the characteristics.
Disclosure of Invention
The invention aims to solve the problems that the vertical, horizontal and longitudinal explosion impact resistance displacement restriction and the protection of an elastic shaft and flexible connection of a gas turbine device cannot be realized in the prior art, and further provides a nonlinear elastic impact resistance limiter of a propulsion type gas turbine device.
The nonlinear elastic impact-resistant limiter of the propulsion type gas turbine device comprises a limiter upper cover, a horizontal upper limiting sleeve, a horizontal upper linear elastic sleeve, a horizontal outer limiting bushing, a limiting stretch-resistant bushing, a limiter base, a bottom steel plate, a vertical impact-resistant net, a limiting gasket, a central screw, a disc-shaped spring, a connecting shaft and two horizontal limiting bushings;
the upper cover of the limiter is of a barrel shape, a first cylindrical bulge is arranged at the center of the inner surface of a top plate of the upper cover of the limiter, a first threaded hole coaxial with the first cylindrical bulge is formed in the first cylindrical bulge, a cylindrical cavity is formed in the lower portion of the inner wall of the upper cover of the limiter, and the bottom surface of the cylindrical cavity is horizontally arranged with the opening surface of the upper cover of the limiter;
the limiter base is a cuboid, a second cylindrical bulge is arranged at the center of the upper surface of the limiter base, a cylindrical cavity coaxial with the second cylindrical bulge is arranged in the second cylindrical bulge, an annular bulge is arranged on the inner wall of the cylindrical cavity, and a first through hole is formed in the center of the bottom of the cylindrical cavity;
a hexagonal blind hole is formed in the center of the lower surface of the non-threaded end of the central screw rod;
the limiting stretch-proof bushing is of a cylindrical structure, a third cylindrical bulge is arranged on the upper surface of the limiting stretch-proof bushing, and a stepped through hole is formed in the limiting stretch-proof bushing;
the disc spring, the limit gasket, the vertical impact net and the bottom steel plate are sequentially arranged on the bottom inner wall of the cylindrical cavity from bottom to top, the non-threaded end of the central screw is arranged on the upper surface of the bottom steel plate, the limit stretch-resistant bush is sleeved on the non-threaded end of the central screw, the lower surface of the limit stretch-resistant bush is arranged flush with the lower surface of the non-threaded end of the central screw, the upper surface of the limit stretch-resistant bush is arranged flush with the upper edge of the annular bulge, the horizontal upper linear elastic sleeve is arranged in the cylindrical cavity above the annular bulge, the horizontal upper limit sleeve is arranged inside the horizontal upper linear elastic sleeve, the upper stopper cover is arranged on the stopper base, the first threaded hole is in threaded connection with the central screw, the horizontal upper limit sleeve is sleeved on the outer wall of the first cylindrical bulge, the horizontal outer limit bush and the two horizontal limit bushes are sleeved between the inner side wall of the cylindrical cavity in the upper stopper cover and the outer wall of the second cylindrical bulge, and the two horizontal limit bushes are sequentially sleeved on the horizontal outer limit bush from bottom to top;
preferably, the device further comprises a sealing plate, a groove is formed in the lower surface of the base of the limiter, and the sealing plate is installed in the groove;
preferably, the sealing plate is fixedly connected with the groove through screws, a plurality of second threaded holes are formed in the upper surface of the groove at equal intervals along the circumferential direction, a plurality of counter bores are formed in the upper surface of the sealing plate at equal intervals along the circumferential direction, the threaded end of each screw penetrates through one counter bore and is arranged in one second threaded hole, and the threaded end of the screw is in threaded connection with the second threaded hole;
preferably, the number of the screws is 4-6, the number of the second threaded holes is 4-6, and the number of the counter bores is 4-6;
preferably, the device further comprises a heightening base, wherein a plurality of bottom mounting holes are formed in the heightening base, and the heightening base is mounted on the lower surface of the limiter base;
preferably, the heightening base and the limiter base are fixedly connected through bolts, four corners of the heightening base are respectively provided with an internal connection screw hole, four corners of the lower surface of the limiter base are respectively provided with a fourth screw hole, the threaded ends of the bolts are arranged in the fourth screw holes through the internal connection screw holes, and the threaded ends of the bolts are respectively in threaded connection with the internal connection screw holes and the fourth screw holes;
preferably, a plurality of top mounting screw holes are formed in the upper surface of the upper cover of the limiter at equal intervals along the circumferential direction;
preferably, the number of the top mounting screw holes is 4-6;
preferably, the horizontal outer limit bushing and the horizontal upper limit sleeve are both made of nylon;
preferably, the vertical impact-resistant net and the horizontal limiting lining are both made of metal wires.
Compared with the prior art, the invention has the following beneficial effects:
1. compared with the device provided by the prior art, the three-dimensional impact displacement limiting device has the advantages that three-dimensional different impact rigidity and clearance of the limiter with the cylindrical structure are increased, so that the impact displacement limiting indexes of the gas turbine in the vertical direction, the transverse direction and the longitudinal direction are met. The shock-resistant elastic component of the inner cavity of the limiter has the characteristics of step-by-step multi-layer composite elasticity and damping, and on the premise that the design space and the configuration of the product are determined, the shock stiffness to the transverse direction and the longitudinal direction is enhanced in the cylindrical inner and outer cavity structure of the product, and the space utilization rate is high. In order to meet the impact nonlinear stiffness characteristic, the impact resistant elastic element component is designed with modularized replacement of different stiffness such as rubber, nylon, steel wire mesh, disc springs and the like. The nonlinear impact stiffness characteristic ensures that the vibration isolation performance of the limiter is not affected when the unit vibrates with small displacement, and also limits the unit to generate larger displacement under the impact condition, thereby protecting the connection structure of the propulsion type gas turbine.
2. Compared with the device provided by the prior art, the sealing plate is added, so that the sealing effect can be better achieved, sundries and liquid are prevented from entering the device, and the impact resistance of the device is affected.
3. Compared with the device provided by the prior art, the height-increasing base is increased, the whole height of the device can be increased, the device is more suitable for different ships, the heights of the ship supports are different due to the fact that the ship base panels of different ships are different, the practicality of the device cannot be affected by the increased height-increasing base, and meanwhile the universality of the device can be better improved.
4. Compared with the connection mode in the device provided by the prior art, the invention adopts threaded connection, is convenient to detach and install, is more convenient to replace damaged elements, does not cause the condition that the whole device is invalid due to the damage of a certain element in welding or other integrated designs, well saves the manufacturing and maintenance cost, and reduces the manufacturing and maintenance cost by at least 40 percent.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a bottom view of the raised base of the present invention;
FIG. 4 is a partial cross-sectional view of a booster base of the invention;
FIG. 5 is a cross-sectional view of a stopper mount according to the present invention;
FIG. 6 is a cross-sectional view of the upper cover of the stopper of the present invention;
FIG. 7 is a cross-sectional view of an intermediate screw of the present invention;
in the figure, a 1-1 upper stopper cover, a 1-1 first cylindrical bulge, a 1-2 first threaded hole, a 2 horizontal upper limiting sleeve, a 3 horizontal upper limiting elastic sleeve, a 4 horizontal outer limiting sleeve, a 5 horizontal limiting sleeve, a 6 stopper stretch-resistant sleeve, a 7 stopper base, a 7-1 second cylindrical bulge, a 7-2 cylindrical cavity, a 7-3 annular bulge, a 7-4 groove, a 7-2-1 first through hole, a 7-4-1 second threaded hole, a 8 heightened base, a 9 bottom steel plate, a 10 vertical impact net, a 11 limiting gasket, a 12 central screw, a 12-1 hexagonal blind hole, a 13 sealing plate, a 13-1 counter bore, a 14 dish-shaped spring, 15 screws, a 16 top mounting hole, a 17 bottom mounting hole and a 18 internal connection screw hole.
Detailed Description
The first embodiment is as follows: referring to fig. 1, 5, 6 and 7, the device described in this embodiment includes a stopper upper cover 1, a horizontal upper limit sleeve 2, a horizontal upper linear elastic sleeve 3, a horizontal outer limit sleeve 4, a limit stretch-proof sleeve 6, a stopper base 7, a bottom steel plate 9, a vertical impact net 10, a limit gasket 11, a central screw 12, a disc spring 14, a connecting shaft 19 and two horizontal limit sleeves 5;
the upper cover 1 of the limiter is of a barrel shape, a first cylindrical bulge 1-1 is arranged in the center of the inner surface of the top plate of the upper cover 1 of the limiter, a first threaded hole 1-2 coaxial with the first cylindrical bulge 1-1 is formed in the first cylindrical bulge 1-1, a cylindrical cavity is formed in the lower portion of the inner wall of the upper cover 1 of the limiter, and the bottom surface of the cylindrical cavity is horizontally arranged with the opening surface of the upper cover 1 of the limiter;
the limiter base 7 is a cuboid, a second cylindrical protrusion 7-1 is arranged at the center of the upper surface of the limiter base 7, a cylindrical cavity 7-2 coaxial with the second cylindrical protrusion 7-1 is arranged in the second cylindrical protrusion 7-1, an annular protrusion 7-3 is arranged on the inner wall of the cylindrical cavity 7-2, and a first through hole 7-2-1 is arranged at the center of the bottom of the cylindrical cavity 7-2;
a hexagonal blind hole 12-1 is arranged in the center of the lower surface of the non-threaded end of the central screw rod 12;
the limiting stretch-proof lining 6 is of a cylindrical structure, a third cylindrical bulge is arranged on the upper surface of the limiting stretch-proof lining 6, and a stepped through hole is formed in the limiting stretch-proof lining 6;
the disc spring 14, the limiting gasket 11, the vertical impact net 10 and the bottom steel plate 9 are sequentially arranged on the bottom inner wall of the cylindrical cavity 7-2 from bottom to top, the unthreaded end of the central screw rod 12 is arranged on the upper surface of the bottom steel plate 9, the limiting stretch-resistant bush 6 is sleeved on the unthreaded end of the central screw rod 12, the lower surface of the limiting stretch-resistant bush 6 is flush with the lower surface of the unthreaded end of the central screw rod 12, the upper surface of the limiting stretch-resistant bush 6 is flush with the upper edge of the annular bulge 7-3, the horizontal upper linear elastic sleeve 3 is arranged in the cylindrical cavity 7-2 above the annular bulge 7-3, the horizontal upper limiting sleeve 2 is arranged inside the horizontal upper linear elastic sleeve 3, the upper limiter cover 1 is arranged on the base 7 of the limiter, the first threaded hole 1-2 and the central screw rod 12 are in threaded connection, the horizontal upper limiting sleeve 2 is sleeved on the outer wall of the first cylindrical bulge 1-1, the horizontal outer limiting bush 4 and the two horizontal limiting bushes 5 are arranged between the inner side wall of the cylindrical cavity of the upper limiter 1 and the outer wall of the second cylindrical bulge 7-1, and the horizontal outer limiting bush 4 is sleeved on the upper horizontal outer side of the upper limiter 4-5 in sequence.
The invention aims at a nonlinear elastic impact-resistant limiter designed for impact resistance of a propulsion type gas turbine device, and aims at balancing three-way impact response and impact displacement of a unit to achieve system design indexes on the premise of ensuring vibration isolation requirements of the unit. In terms of the structural design and the component performance of the limiter, the compression amount and the installation height of the quota damper realize modularization and adjustable controllability to a certain extent.
The three-dimensional different impact rigidity and the three-dimensional different impact clearance of the limiter with the cylindrical structure are designed to meet the impact displacement limiting indexes of the gas turbine in the vertical direction, the transverse direction and the longitudinal direction. The shock-resistant elastic component of the inner cavity of the limiter has the characteristics of step-by-step multi-layer composite elasticity and damping, and on the premise that the design space and the configuration of the product are determined, the shock stiffness to the transverse direction and the longitudinal direction is enhanced in the cylindrical inner and outer cavity structure of the product, and the space utilization rate is high. In order to meet the impact nonlinear stiffness characteristic, the impact resistant elastic element component is designed with modularized replacement of different stiffness such as rubber, nylon, steel wire mesh, disc springs and the like. The nonlinear impact stiffness characteristic ensures that the vibration isolation performance of the limiter is not affected when the unit vibrates with small displacement, and also limits the unit to generate larger displacement under the impact condition, thereby protecting the connection structure of the propulsion type gas turbine.
The vertical nonlinear impact structural element mainly comprises a limiter stretch-resistant bushing, a vertical impact net, a limiting gasket and a disc spring, and has a small rigidity value in the initial stage of impact deformation without affecting the vertical vibration isolation performance of the unit; when the impact deformation is large, the vertical nonlinear impact structural element has large damping capacity. The impact damping coefficient in the anti-stretching bushing rubber material of the limiter is about 0.12, the anti-stretching bushing rubber material is a stepped rubber (nylon) annular sleeve, and in the vertical stretching displacement stage, enough anti-stretching counter force is generated through extrusion deformation, so that the vertical stretching displacement of the gas turbine isolation system is limited and the acceleration response requirement is met. The rigidity value of the vertical impact-resistant metal steel wire mesh in a deformation area of 2-4mm is more than or equal to 5000N/mm. In the vertical compression displacement stage, the vertical compression displacement of the gas turbine isolation system is limited and the acceleration response requirement is met through elastic elements such as vertical impact-resistant metal steel wire meshes, disc springs and the like which are arranged in the inner cavity of the base of the limiter.
The transverse and longitudinal nonlinear impact-resistant structural elements mainly comprise structures such as a horizontal upper limiting sleeve, a horizontal limiting bushing, a horizontal outer limiting bushing, a horizontal upper limiting elastic sleeve, a limiter stretch-resistant bushing and the like, and play a role in resisting impact in the horizontal direction of the gas turbine device. The horizontal impact-resistant structural element with limited volume (an inner ring-shaped structure) is gradually and non-linearly deformed along with the impact process by rubber, steel wire mesh and nylon materials of the inner ring and the outer ring. The metal wire bushing and the like have high rigidity, and the loss factor reaches more than 0.2. The effective density, the heat treatment, the winding node and the speed adjustment are adjusted, the deformation after the stamping forming of the finished product and the creep deformation permanent deformation generated by single impact are controlled to be less than 0.5mm, the static pressure rigidity value of the horizontal limiting metal steel wire bushing in a deformation area of 3-4mm is more than or equal to 45kN/mm, and the static pressure rigidity value of the horizontal upper limiting elastic sleeve in a deformation area of 3-4mm is more than or equal to 15kN/mm. The limiter has nonlinear piecewise elastic-damping characteristics, so that the transverse and longitudinal impact displacement of the gas turbine isolation system is limited and the acceleration response requirement is met.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 1 and 5, in which the device further includes a sealing plate 13, the lower surface of the stopper base 7 is provided with a groove 7-4, and the sealing plate 13 is mounted in the groove 7-4. Other undisclosed connections are the same as in the first embodiment.
So set up, can be better play sealed effect, prevent debris and liquid from entering into inside the device, influence the impact resistance of device.
And a third specific embodiment: referring to fig. 1, in this embodiment, the sealing plate 13 and the groove 7-4 are fixedly connected with each other by screws, the plurality of second threaded holes 7-4-1 are circumferentially equidistantly formed in the upper surface of the groove 7-4, the plurality of counter bores 13-1 are circumferentially equidistantly formed in the upper surface of the sealing plate 13, the threaded end of each screw 15 passes through one counter bore 13-1 and is disposed in one second threaded hole 7-4-1, and the threaded end of the screw 15 is in threaded connection with the second threaded hole 7-4-1. Other undisclosed connections are the same as in the second embodiment.
The sealing plate can be better replaced and detached by the arrangement, compared with other mounting modes, the threaded connection is the simplest and most convenient and low in cost, and better interchangeability and economy are better reflected while better tightness is realized.
The specific embodiment IV is as follows: in this embodiment, the number of screws 15 is 4-6, the number of screw holes 7-4-1 is 4-6, and the number of counter bores 13-1 is 4-6, as described with reference to fig. 1. Other undisclosed connections are the same as in the third embodiment.
So set up, because connecting screw hole is circumference equidistance and distributes, set up 4-6 and just can be fine play fixed and connection effect, because the holistic processing requirement of device is higher, it is more complicated to process too much screw hole, and has increased processing cost and processing degree of difficulty.
Fifth embodiment: referring to fig. 1, 3 and 4, the device in this embodiment further includes a height-increasing base 8, a plurality of bottom mounting holes 17 are formed in the height-increasing base 8, and the height-increasing base 8 is mounted on the lower surface of the stopper base 7. Other undisclosed connections are the same as in the first or second embodiments.
Specific embodiment six: referring to fig. 5, in this embodiment, the height-increasing base 8 and the limiter base 7 are fixedly connected by bolts, four corners of the height-increasing base 8 are respectively provided with an internal connection screw hole 18, four corners of the lower surface of the limiter base 7 are respectively provided with a fourth screw hole, the threaded end of the bolt is arranged in the fourth screw hole through the internal connection screw hole 18, and the threaded end of the bolt is respectively in threaded connection with the internal connection screw hole 18 and the fourth screw hole. Other unpublished connections are the same as in embodiment five.
So set up, can increase the overall height of this device, be more suitable for the vessel of difference and use, because the hull base panel of different hulls is different, leads to the highly also different of hull support, has increased the practicality that increases the base and can not influence this device, the commonality of this device has also been improved that simultaneously can be better.
Seventh embodiment: referring to fig. 2, in this embodiment, a plurality of top mounting screw holes 16 are equidistantly formed on the upper surface of the upper stopper cover 1 in the circumferential direction. Other undisclosed connections are the same as in the first embodiment.
So set up, in order to make this device better with hull leg joint, conveniently dismantle, avoid after the welding because the device internal element receives the destruction, unable change leads to whole device to become invalid to increase maintenance cost.
Eighth embodiment: the number of the top mounting screw holes 16 in this embodiment is 4 to 6, as described in connection with fig. 2. Other undisclosed connections are the same as in embodiment seven.
So set up, because connecting screw hole is circumference equidistance and distributes, set up 4-6 and just can be fine play fixed and connection effect, because the holistic processing requirement of device is higher, it is more complicated to process too much screw hole, and has increased processing cost and processing degree of difficulty.
Detailed description nine: in the present embodiment, the horizontal outer limit bushing 4 and the horizontal upper limit sleeve 2 are made of nylon, as described with reference to fig. 1. Other undisclosed connections are the same as in the first embodiment.
The nylon has better plasticity, can play a good buffering effect when encountering impact, can resist the impact and simultaneously can protect the device, and has lower price and certain economical efficiency.
Detailed description ten: referring to fig. 1, in this embodiment, the vertical impact-resistant net 10 and the horizontal limiting bushing 5 are made of metal wires. Other undisclosed connections are the same as in the first embodiment.
So set up, the metal wire can be fine to slow down vertical impact compression load, because vertical impact force is comparatively concentrated, and is greater to the buffering space and the time requirement of device, consequently select the metal wire to use as the main material who slows down vertical impact force, just its deformation volume can be greater than materials such as nylon and rubber, is fit for the condition of vertical buffering more.
Principle of operation
The upper cover metal plate of the limiter is of a barrel-shaped structure, a cylindrical threaded hole column is arranged in the upper cylindrical inner cavity, the upper part of a central screw rod connected with the inner cavity is connected with the upper cover of the limiter, the lower part of the central screw rod is connected with the base of the limiter, and impact vertical impact load is transmitted through the screw rod. The lower part of the central screw is provided with a limiter stretch-proof bushing for absorbing vertical impact energy, and the lower part of the central screw, namely the lower part of the inner cavity of the limiter base, is provided with a vertical impact-resistant net, a disc-shaped spring and a limiting gasket for bearing vertical impact compression load. The thickness of the elastic element is designed and adjusted to control the initial displacement of the limiter which acts under the action of vertical impact.
The upper part of the cylindrical inner cavity of the metal plate of the limiter base is provided with a horizontal upper limit sleeve and a horizontal limit bushing; a cylindrical outer cavity between the base and the upper cover is provided with a horizontal outer limit bushing and a horizontal upper limit elastic sleeve. The limiting device is mainly used for limiting the horizontal impact relative displacement of the base of the limiter and the upper cover of the limiter. The radial clearance between the elastic elements is designed and adjusted to control the initial displacement of the limiter which acts under the action of transverse and longitudinal impact.
The contact areas of the central screw rod, the upper cover, the base and the elastic element are large enough to increase the transverse and longitudinal impact rigidity of the limiter and limit the impact displacement. The central screw rod and the upper cover, the base are contacted with the stretch-proof bush, the horizontal upper limit sleeve, the horizontal limit bush, the horizontal outer limit bush, the horizontal upper limit elastic sleeve, the vertical impact-resistant net and the disc-shaped spring, and the elastic elements such as rubber, steel wire net, nylon, the disc-shaped spring and the like act step by step along with the increase of impact displacement. The nonlinear impact structural characteristics of the composite elasticity of the limiter product and the damping element are realized. According to the impact acceleration response and the limiting requirements, the number and the types of the elastic elements are respectively adjusted to realize different impact rigidities.
In the early-middle stage of the impact process, the gas turbine vibration damper is used for damping through a rubber main body structure and absorbing initial impact load energy, and is used for bearing main buffering of deformation of a gas turbine isolation system, and along with accumulation of the impact energy, after an initial small deformation range, a limiter is used for limiting impact displacement of a gas turbine device, so that a connecting structure is protected, and vertical, transverse and longitudinal acceleration response and displacement response of the gas turbine device are affected; the material characteristics of the nonlinear elastic element are that the elastic force is increased in a nonlinear way along with the increase of deformation, the nonlinear elastic element has larger damping and energy consumption characteristics, the rigidity characteristic is smaller in the initial stage, the vibration isolation performance is not influenced, the nonlinear large elastic-damping impact buffering counter force is provided for the middle-later stage of the deformation of the isolation system, and the maximum displacement is limited.
Claims (8)
1. A non-linear elastic shock-resistant limiter of a propulsion type gas turbine device is characterized in that: the anti-impact device comprises a limiter upper cover (1), a horizontal upper limiting sleeve (2), a horizontal upper linear elastic sleeve (3), a horizontal outer limiting sleeve (4), a limiting stretch-proof sleeve (6), a limiter base (7), a bottom steel plate (9), a vertical impact net (10), a limiting gasket (11), a central screw (12), a disc spring (14) and two horizontal limiting sleeves (5);
the upper cover (1) of the limiter is of a barrel shape, a first cylindrical bulge (1-1) is arranged in the center of the inner surface of the top plate of the upper cover (1) of the limiter, a first threaded hole (1-2) coaxial with the first cylindrical bulge (1-1) is formed in the first cylindrical bulge (1-1), a cylindrical cavity is formed in the lower portion of the inner wall of the upper cover (1) of the limiter, and the bottom surface of the cylindrical cavity and the opening surface of the upper cover (1) of the limiter are horizontally arranged;
the limiter base (7) is a cuboid, a second cylindrical bulge (7-1) is arranged at the center of the upper surface of the limiter base (7), a cylindrical cavity (7-2) coaxial with the second cylindrical bulge (7-1) is arranged in the second cylindrical bulge (7-1), an annular bulge (7-3) is arranged on the inner wall of the cylindrical cavity (7-2), and a first through hole (7-2-1) is formed in the bottom center of the cylindrical cavity (7-2);
a hexagonal blind hole (12-1) is formed in the center of the lower surface of the non-threaded end of the central screw rod (12);
the limiting stretch-proof lining (6) is of a cylindrical structure, a third cylindrical bulge is arranged on the upper surface of the limiting stretch-proof lining (6), and a stepped through hole is formed in the limiting stretch-proof lining (6);
the disc spring (14), the limit gasket (11), the vertical impact net (10) and the bottom steel plate (9) are sequentially arranged on the bottom inner wall of the cylindrical cavity (7-2) from bottom to top, the unthreaded end of the central screw rod (12) is arranged on the upper surface of the bottom steel plate (9), the limit stretch-resistant bush (6) is sleeved on the unthreaded end of the central screw rod (12), the lower surface of the limit stretch-resistant bush (6) is flush with the lower surface of the unthreaded end of the central screw rod (12), the upper surface of the limit stretch-resistant bush (6) is flush with the upper edge of the annular bulge (7-3), the horizontal upper linear elastic sleeve (3) is arranged in the cylindrical cavity (7-2) above the annular bulge (7-3), the horizontal upper limit sleeve (2) is arranged in the horizontal upper linear elastic sleeve (3), the upper limiter cover (1) is arranged on the limiter base (7), the first threaded hole (1-2) is in threaded connection with the central screw rod (12), the horizontal upper limit sleeve (2) is sleeved on the first cylindrical bulge (1) and the two outer walls (1) are arranged between the horizontal bulge (1) and the two cylindrical sleeves (1-5), the horizontal outer limiting bush (4) is sleeved on the outer wall of the second cylindrical bulge (7-1), and the two horizontal limiting bushes (5) are sleeved on the horizontal outer limiting bush (4) from bottom to top in sequence;
the vertical impact-resistant net (10), the limiting gasket (11) and the disc spring (14) are matched with the limiter stretch-resistant bushing (6) to form a vertical nonlinear impact-resistant structural element, and the vertical nonlinear impact-resistant structural element has small rigidity value in the initial stage of impact deformation and does not influence the vertical vibration isolation performance of the unit; when impact deformation is large, the vertical nonlinear impact structural element has large damping buffer capacity, the impact damping coefficient of the stopper stretch-resistant bushing (6) is 0.12, the stopper stretch-resistant bushing is a stepped rubber annular sleeve, and in the vertical stretching displacement stage, enough stretch-resistant counter force is generated through extrusion deformation, so that the vertical stretching displacement of the gas turbine isolation system is limited and acceleration response requirements are met, the rigidity value of the vertical impact net (10) in a deformation area of 2-4mm is more than or equal to 5000N/mm, and in the vertical compression displacement stage, the vertical compression displacement of the gas turbine isolation system is limited and the acceleration response requirements are met through the vertical impact net (10) and the disc spring (14) which are arranged in the inner cavity of the stopper base;
the horizontal upper limiting sleeve (2), the horizontal upper linear elastic sleeve (3), the horizontal outer limiting sleeve (4) and the horizontal limiting sleeve (5) are matched with the limiter stretch-resistant sleeve (6) to form a horizontal and longitudinal nonlinear impact structural element, the horizontal and longitudinal nonlinear impact structural element has the horizontal impact function of the gas turbine device, the limited volume of the horizontal impact structural element gradually and nonlinearly generates elastic deformation along with the impact process, the rubber, the steel wire gauze and the nylon material of the inner ring and the outer ring, the metal wire sleeve has high rigidity, the loss factor reaches more than 0.2, the effective density, the heat treatment, the winding node and the rate adjustment are adjusted, the deformation after the finished product is stamped and the creep permanent deformation generated by single impact are controlled to be less than 0.5mm, the static pressure rigidity value in the 3-4mm deformation area of the horizontal limiting sleeve (5) is more than or equal to 45kN/mm, the static pressure rigidity value in the 3-4mm deformation area of the horizontal upper linear elastic sleeve (3) is more than or equal to 15kN/mm, the limiter has nonlinear sectional elastic-damping characteristics, and the gas turbine isolation system is enabled to meet the requirement of the response of the horizontal impact displacement;
the device further comprises a sealing plate (13), a groove (7-4) is formed in the lower surface of the limiter base (7), and the sealing plate (13) is arranged in the groove (7-4);
the sealing plate (13) is fixedly connected with the groove (7-4) through bolts, a plurality of second threaded holes (7-4-1) are formed in the upper surface of the groove (7-4) at equal intervals along the circumferential direction, a plurality of counter bores (13-1) are formed in the upper surface of the sealing plate (13) at equal intervals along the circumferential direction, the threaded end of each bolt (15) penetrates through one counter bore (13-1) and is arranged in one second threaded hole (7-4-1), and the threaded end of each bolt (15) is in threaded connection with the second threaded hole (7-4-1).
2. A non-linear, resilient, impact-resistant retainer for a propulsion gas turbine plant as set forth in claim 1, wherein: the number of the screws (15) is 4-6, the number of the second threaded holes (7-4-1) is 4-6, and the number of the counter bores (13-1) is 4-6.
3. A non-linear elastic impact limiter for a propulsion gas turbine plant as claimed in claim 1 or 2 wherein: the device further comprises a heightening base (8), a plurality of bottom mounting holes (17) are formed in the heightening base (8), and the heightening base (8) is mounted on the lower surface of the limiter base (7).
4. A pusher gas turbine apparatus nonlinear elastic shock resistance limiter according to claim 3, wherein: the height-increasing base (8) and the limiter base (7) are fixedly connected through bolts, four corners of the height-increasing base (8) are respectively provided with an internal connection screw hole (18), four corners of the lower surface of the limiter base (7) are respectively provided with a fourth screw hole, the threaded end of each bolt penetrates through the corresponding internal connection screw hole (18) and is arranged in the corresponding fourth screw hole, and the threaded end of each bolt is respectively in threaded connection with the corresponding internal connection screw hole (18) and the corresponding fourth screw hole.
5. A non-linear, resilient, impact-resistant retainer for a propulsion gas turbine plant as set forth in claim 1, wherein: the upper surface of the upper stopper cover (1) is provided with a plurality of top mounting screw holes (16) at equal intervals along the circumferential direction.
6. A pusher-type gas turbine apparatus nonlinear elastic shock-resistant limiter as in claim 5 wherein: the number of the top mounting screw holes (16) is 4-6.
7. A non-linear, resilient, impact-resistant retainer for a propulsion gas turbine plant as set forth in claim 1, wherein: the horizontal outer limit bushing (4) and the horizontal upper limit sleeve (2) are both made of nylon.
8. A non-linear, resilient, impact-resistant retainer for a propulsion gas turbine plant as set forth in claim 1, wherein: the vertical impact-resistant net (10) and the horizontal limiting bushing (5) are made of metal wires.
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| CN201910164864.XA CN109707778B (en) | 2019-03-05 | 2019-03-05 | Nonlinear elastic impact-resistant limiter of propulsion type gas turbine device |
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