KR101766112B1 - Gas turbine comprising rigidity control means utilizing casing support plate and strut support plate - Google Patents

Abstract

According to an embodiment of the present invention, there is provided a gas turbine including a casing forming an outer shape of a gas turbine, a bearing portion provided at an inner center of the casing, a plurality of struts each having one end coupled to the bearing portion and the other end coupled to the casing, A plurality of struts each and a strut support plate detachably coupled to the casing. By providing the plurality of strut support plates which are detachably coupled in this manner, the size of each of the plurality of strut support plates can be adjusted to further facilitate the vibration absorption design.

Description

[0001] The present invention relates to a gas turbine comprising rigidity adjusting means utilizing a casing support plate and a strut support plate,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas turbine, and more particularly to a gas turbine in which rigidity can be adjusted by inserting a casing support plate into a connecting portion of a support and a case and a connecting portion between a strut and a case.

A gas turbine is a rotary type heat engine that drives a turbine with high-temperature and high-pressure combustion gas, which consists of a compressor, a combustor, and a turbine. More specifically, a gas turbine compresses air with a compressor and burns compressed air and fuel in the combustion chamber. The high-temperature and high-pressure gas generated at this time is blown into the turbine while expanding to rotate the turbine. In this process, the turbine rotates at a high speed and vibrations are generated, and a design for absorbing vibrations in the gas turbine design is required.

The gas turbine case is generally supported by a support, and the support is located at least on the compressor side and the turbine side. The gas turbine is mounted on such supports, and the case and the support are firmly engaged with each other, thereby absorbing and suppressing vibration generated during operation of the gas turbine. By absorbing and suppressing vibrations during operation of the gas turbine, damage to the gas turbine components can be prevented and eventually increase the life of the entire gas turbine system or each component.

However, in the gas turbine design considering such vibration absorption, it is troublesome to re-design the vibration absorbing design considering the frequency every time a part of the deformation design of the gas turbine is designed. This is because the operation speed (hereinafter referred to as "resonance point") causing resonance may vary depending on the design of the gas turbine. Therefore, even if the resonance point changes, a means for simply adjusting the damping ability according to the changed resonance point is required.

In addition, in order to absorb vibration by using only a conventional support and a casing, means for absorbing vibration in the vertical direction (gravity direction and the opposite direction) as well as vibration in the horizontal direction is required.

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a casing supporting plate and a method of manufacturing the same by inserting a casing supporting plate into a casing- flexibility of the connecting portions is adjusted to adjust the rigidity of the connecting portions and to improve the damping capability of the gas turbine device.

A gas turbine according to a first embodiment of the present invention includes a casing forming an outer shape of a gas turbine, a plurality of casing legs connected to a lower portion of the casing to support a load of the casing, And a support which is coupled to the casing support plate and supports the casing support plate.

The casing support plate of this embodiment is detachably coupled to the casing leg and the support.

The casing support plate includes a first through hole, and the casing leg includes a coupling member formed at a lower end thereof and insertable into the first through hole.

The engaging member includes a thread at its end, so that the nut can be assembled to the casing supporting plate.

The gas turbine according to the present embodiment further includes a plurality of fasteners, and the casing support plate includes a plurality of second through holes into which the plurality of fasteners can be inserted, and the casing support plate is supported by the plurality of fasteners It can be fastened to a support.

The flexibility and stiffness of the entire support portion may be adjusted by including an element such as an elastic member at a portion where the casing leg contacts the casing support plate and at a portion where the casing support plate abuts against the support as required.

A gas turbine according to a second embodiment of the present invention includes a casing constituting an outer shape of a gas turbine, a bearing portion provided at an inner center of the casing, a plurality of bearings each having one end coupled to the bearing and the other end coupled to the casing, And a strut support plate detachably coupled to each of the plurality of struts and the casing.

The strut support plate includes a third through-hole, and the strut includes a coupling member formed at an outer end thereof and insertable into the third through-hole, so that the strut is detachably coupled to the strut support plate.

Preferably, the engaging member includes a thread at the end thereof, and the threaded portion is protruded at a side opposite to the inserted direction by inserting the engaging member into the third through hole of the strut support plate.

The gas turbine according to the present embodiment further includes a plurality of fasteners, and the strut support plate includes a plurality of fourth through holes into which the plurality of fasteners can be inserted so that the strut support plate is supported by the plurality of fasteners Can be fastened to the casing.

Preferably, at least one of the plurality of strut support plates is configured to have a size different from that of the other strut support plates, so that anisotropy can be imparted so that the radial direction of the casing has different stiffness.

If necessary, the elastic member may include an element such as a portion where the strut contacts the strut support plate and a portion where the strut support plate contacts the casing, so as to control the flexibility and rigidity of the entire portion where the casing and the strut are connected.

According to one embodiment of the present invention, vibration absorption in the vertical direction during gas turbine operation can be optimized through casing support plate sizing coupled to the connection of the support and the case, without vibration absorption redesign of the entire gas turbine .

According to an embodiment of the present invention, by adjusting the sizes of the casing support plates coupled to the plurality of connection portions of the strut and the case, it is possible to implement isotropic so that the plurality of connection portions have the same rigidity, Accordingly, the present invention can realize anisotropic structure in which the plurality of connection portions have different stiffness, so that the vibration suppression optimized for the characteristics of the gas turbine to which the present invention is applied can be achieved.

1 is a schematic side view of a gas turbine including a support according to a first embodiment of the present invention;
2 is a cross-sectional view showing a structure in which the casing support plate according to the first embodiment is fixed to a support and supports the casing
Fig. 3 is an exploded perspective view showing a structure in which the components of Fig.
Fig. 4 is a cross-sectional view showing the overall structure of a connection structure between a casing and a strut according to a second embodiment of the present invention
5 is an enlarged view of a portion A of Fig. 4

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Furthermore, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

A gas turbine includes a compressor, a combustor, and a turbine, which sends compressed air from the compressor to a combustor and utilizes compressed air sent from the compressor in the combustor to rotate the turbine by burning the injected fuel. At this time, vibration occurs in the gas turbine due to combustion and explosion of the fuel, rotation of the turbine, etc. This vibration is absorbed by a support such as 40 in Fig.

1 to 3, which represent a first embodiment of the present invention, a disk 30, which is a single casing support plate, is placed on a support 40, And supports the load of the casing 10 through the support plate and absorbs the vibration.

4 and 5, which represent a second embodiment of the present invention, the casing 10 'and the strut 20 (see FIG. 5) are formed integrally with the bearing portion and the casing, ', A disk 30', which is a strut support plate, is provided, and vibration due to turbine rotation or the like is absorbed through the support plate.

The disks 30 and 30 'shown in FIGS. 1 to 5 are structures that serve to bear loads and absorb vibration in the present invention. In embodiments, the disc 30, 30 'is a medium that withstands the load or vibration transmitted by the casing leg 20 or the strut 20'. By adjusting the size of the disc 30, 30 ' (30, 30 ') may vary.

That is, when the disks 30 and 30 'are thick, the flexibility is low, and when the disks 30 and 30' are thin, the flexibility is increased. Likewise, when the width of the disks 30 and 30 'is increased, the flexibility is increased, and when the width of the disks 30 and 30' is narrowed, the flexibility is lowered.

In the embodiments of the present invention, the disk is inserted into the portions for load support or vibration absorption of the gas turbine, and the vibration of the entire gas turbine (hereinafter referred to as " disk sizing " And provides optimized damping capability.

This provides a way to optimize the gas turbine vibration absorption design through sizing of each disk without redesigning the entire gas turbine. That is, flexibility and stiffness of each of the casing-support and casing-strut connection portions can be separately adjusted by disk sizing. Even if vibrations are transmitted differently according to the radial direction of the gas turbine casing 10, Absorption can be balanced.

1 to 3 show a first embodiment in which the disc 30 is used in combination with the support 40 and the casing leg 20. A gas turbine 1 according to a first embodiment of the present invention comprises a casing 10 constituting an outer shape of a gas turbine, a plurality of gas turbines 10 connected to a lower portion of the casing 10 for transmitting load and vibration of the casing 10, A casing support plate 30 coupled to the casing leg 20 to receive a load and vibration from the casing leg 20 and a support 40 for fixing and supporting the casing support plate 30 do.

First, as shown in Fig. 1, a conventional gas turbine 1 includes a casing 10 horizontally and a support 40 including a compressor, a combustor, a turbine, etc. at the front and rear of the casing 10 And supports the casing (10). The support 40 basically supports the casing 10 from gravity and absorbs vibration generated by the rotation of the turbine or the like to securely fix the gas turbine.

2 shows a first embodiment of the present invention. The disc 30 is fixed on the support 40. At this time, the exemplary fastener 33 firmly engages the disc 30 with the support 40 through the second through hole 32, which is a part of the disc 30, which is the casing supporting plate. It is preferable that the number of the second through holes 32 is at least two and the number of the fastening holes 33 corresponds to the number of the second through holes 32.

Reference numeral 20 in Figs. 2 and 3 is referred to as a casing leg 20. Fig. 2 and 3, the lower portion of the casing leg 20 is engaged with the disk 30, which is a casing supporting plate, and the upper portion of the casing leg 20 is engaged with a portion of the casing 10. However, this is an exemplary form, and the casing leg 20 may be formed as a part of the casing 10 which is integrally formed with the casing and extends downward. That is, it should be understood that any form of supporting and transferring the load of the casing may serve as a casing leg.

The casing leg 20 transmits the load and the vibration of the casing 10 to the disk 30 and preferably is firmly coupled to the first through hole 31 formed in the central region of the disk 30. [ In particular, in FIG. 2, a coupling member 21, which is further formed at the lower end of the casing leg 20 and protrudes in the longitudinal direction, is firmly coupled to the first through hole 31, 3 shows a configuration in which the engaging member 21 includes threads and the engaging member 21 having the threads penetrating the disc is assembled to the nut 2 from the lower portion of the disc 30. [

3 is an exploded perspective view for explaining assembly of the disk 30, the casing leg 20, and the support 40, which is a casing supporting plate. Although four second through holes 32, four fasteners 33 and four fastening holes 41 formed on the support 40 are shown on the disk 30, It can be changed at any time depending on the design. Although it is shown that the cross-section of the support 40 is circular, it can also be deformed into any other shape as necessary to support the load of the gas turbine, and only the second through hole 32 and fastener 33 ). ≪ / RTI >

The gas turbine according to the present embodiment can adjust the rigidity of the support portion (the portion including the support 40 and the disk 30) through the disk sizing of the disk 30, There is an advantage that the load supporting and vibration damping ability can be controlled by changing only the disk 30 without the need.

4 and 5 show a second embodiment in which a disc 30 'similar to the disc 30 is used in combination with the casing 10' and the strut 20 '. The gas turbine 1 according to the second embodiment of the present invention includes a casing 10 'constituting an outer shape of a gas turbine, a bearing portion 15' positioned at an inner center of the casing 10 ', a casing 10' And a strut support plate 30 'coupled to each of the plurality of struts 20' and fixed to the casing 10 '.

In general, when the gas turbine operates, vibration is transmitted to the casing through the bearing portion and the strut due to components such as a turbine rotating at a high speed in the casing, and this vibration is absorbed in the support portion as described in the first embodiment . However, due to the nature of the support, it is desirable to absorb the vertical component of the gas turbine vibration (i.e., the direction opposite to the gravity direction), but there is a limit to absorbing the component in the horizontal direction. That is, the entire gas turbine has a weak stiffness in the horizontal direction than in the vertical direction. This is because the support part not only supports the load of the gas turbine itself, but also is formed long in the vertical direction and fixed in the vertical direction.

Accordingly, in a second embodiment of the present invention, a plurality of struts 20 'extending in the radial direction from the bearing portion 15' are shown to compensate for the disadvantages described above. Referring to FIG. 4, And are connected to the casing 10 'via a disc 30', which is a strut support plate at the "A" portion. 4, the disks 30 'corresponding to the horizontally connected struts 20' correspond to the thickest and vertically connected struts 20 '. The discs 30 'are illustrated to be the thinnest. This is a configuration for primarily attenuating the horizontal vibration in the casing 10 'that is relatively difficult to attenuate in the support portion by relatively increasing the rigidity of the disk connected in the horizontal direction. By having such a configuration, the gas turbine can achieve a further improved vibration absorbing effect.

Another advantage of the present embodiment is that it can be designed simply to avoid each resonance point through disk sizing according to the change of the resonance point depending on the design of the gas turbine. That is, if the size of the disks is adjusted only, the stiffness can be adjusted according to the characteristics of each gas turbine.

According to the gas turbine according to the present embodiment, when the lateral (horizontal) vibration is severe, for example, a method of increasing the thickness of the disks in the horizontal direction, narrowing the surface points, or replacing them with disks made of a material having higher rigidity It is possible to attenuate the lateral vibration.

5, the disk 30 ', which is a strut support plate, is fastened to the grooves of the fourth through hole 32' and the casing 10 'while covering the hole 11' formed in the casing 10 ' 'Are screwed together. The strut 20 'is inserted into the third through hole 31' of the disc 30 'and fixed to the nut 2' by an engaging member 21 'extending in the outer longitudinal direction of the strut 20' do. In this state, the vibration of the gas turbine is transmitted to the disk 30 ', and the degree of absorption of vibration transmitted from each strut 20' varies depending on the size of each disk 30 '.

The embodiment shown in Figs. 4 and 5 is only one embodiment, and the shape and configuration of the strut, the shape of the disk, the first through-hole and the coupling member, and the second through- It is to be understood that the present invention may be modified in various forms and configurations within the scope to be achieved. For example, the fastener 33 'may be a fixing means other than a bolt, and the nut 2' may also be a fixing means, such as a clamp, rather than a nut.

According to a preferred embodiment, a sealing member may be inserted between the disc 30 'and the casing 10'.

The disk 30 'may have a disk shape, but may have a rectangular parallelepiped shape if necessary, or may have other shapes depending on the need for rigidity adjustment, and may be formed in a bent plate shape instead of a flat plate.

According to a preferred embodiment, each of the struts 20 'may also achieve vibration absorption optimization by varying the characteristics of its thickness, material, etc., such as "disk sizing"

It is understood that the stiffness adjustment device utilizing the disk according to the present invention is applicable to any extent that the use or operation of the device is not limited in devices that require vibration or load damping even without a gas turbine .

According to the preferred embodiment, it is possible to achieve a stiffness adjusting structure in which both the horizontal direction vibration and the vertical direction vibration are taken into consideration by integrating both the first embodiment and the second embodiment. That is, this embodiment includes a casing constituting the external shape of the gas turbine, a plurality of casing legs 20 connected to the lower portion of the casing for transmitting the load and vibration of the casing, the casing legs 20 combined with the casing legs 20, And a support 40 for fixing and supporting the casing support plate 30. The casing support plate 30 further includes a bearing portion 15 'provided at an inner center of the casing, A plurality of struts 20 'coupled to the bearing portion 15' and the other end coupled to the casing to connect the casing and the bearing portion 15 ', and a plurality of struts 20' A gas turbine comprising a strut support plate (30 ') to be engaged, the casing support plate being releasably engaged with a casing leg and a support.

With such a configuration, if the strut support plate coupled in the horizontal direction is made thicker or narrower or thicker than the strut support plate coupled in the vertical direction, the horizontal component of the vibration is mainly absorbed in the hard disk, The vertical component of the vibration is mainly absorbed in the support, so that the entirety of the gas turbine is not required to be redesigned as compared with the conventional gas turbine.

Claims (20)

A casing forming an outer shape of the gas turbine;
A plurality of casing legs connected to a lower portion of the casing and extending downward;
A casing support plate coupled to the casing leg to receive a load and a vibration from the casing leg; And
And a support coupled to the casing support plate to support the casing support plate,
Wherein the casing support plate is detachably coupled to the casing leg and the support,
Wherein the support includes a ring-shaped protrusion extending upwardly thereon and a space portion formed in the protrusion, the casing support plate being bolted to the protrusion,
Wherein the casing leg is vertically coupled to the casing support plate at an upper portion of the space portion. The method according to claim 1,
Wherein the casing support plate includes a first through hole,
Wherein the casing leg includes an engaging member formed at a lower end thereof and insertable into the first through hole. 3. The method of claim 2,
Wherein the engaging member includes a screw thread at an end thereof, wherein the nut can be assembled to the casing support plate. The method according to claim 1,
Further comprising a plurality of fasteners,
Wherein the casing support plate includes a plurality of second through holes into which the plurality of fasteners can be inserted,
Wherein said casing support plate is fastenable to said support by said plurality of fasteners. 5. The method according to any one of claims 1 to 4,
A bearing portion provided at an inner center of the casing;
A plurality of struts, one end of which is coupled to the bearing and the other end is coupled to the casing to connect the casing and the bearing; And
And a strut support plate detachably coupled to each of the plurality of struts and the casing. 6. The method of claim 5,
Wherein the strut support plate includes a third through hole,
Wherein the strut includes an engaging member formed at an outer end thereof and insertable into the third through hole. The method according to claim 6,
Wherein the engaging member includes a thread at an end thereof, and the nut can be assembled to the strut support plate. 6. The method of claim 5,
Further comprising a plurality of fasteners,
Wherein the strut support plate includes a plurality of fourth through holes into which the plurality of fasteners can be inserted,
Wherein the strut support plate is fastenable to the casing by the plurality of fasteners. 6. The method of claim 5,
Wherein at least one of the plurality of strut support plates has a different size than the other strut support plates. A casing forming an outer shape of the gas turbine;
A plurality of casing legs connected to a lower portion of the casing and extending downward;
A casing support plate coupled to the casing leg to receive a load and a vibration from the casing leg;
A support coupled to the casing support plate to support the casing support plate;
A bearing portion provided at an inner center of the casing;
A plurality of struts, one end of which is coupled to the bearing and the other end is coupled to the casing to connect the casing and the bearing; And
And a strut support plate detachably coupled to each of the plurality of struts and the casing,
The casing support plate is detachably coupled to the casing leg and the support. 11. The method of claim 10,
Wherein the support includes a ring-shaped protrusion extending upwardly thereon and a space portion formed in the protrusion, the casing support plate being bolted to the protrusion,
Wherein the casing leg is vertically coupled to the casing support plate at an upper portion of the space portion. 12. The method of claim 11,
Wherein the casing support plate includes a first through hole,
Wherein the casing leg includes an engaging member formed at a lower end thereof and insertable into the first through hole. 13. The method of claim 12,
Wherein the engaging member includes a screw thread at an end thereof, wherein the nut can be assembled to the casing support plate. 12. The method of claim 11,
Further comprising a plurality of fasteners,
Wherein the casing support plate includes a plurality of second through holes into which the plurality of fasteners can be inserted,
Wherein said casing support plate is fastenable to said support by said plurality of fasteners. 15. The method according to any one of claims 10 to 14,
Wherein the strut support plate includes a third through hole,
Wherein the strut includes an engaging member formed at an outer end thereof and insertable into the third through hole. 16. The method of claim 15,
Wherein the engaging member includes a thread at an end thereof, and the nut can be assembled to the strut support plate. 16. The method of claim 15,
Further comprising a plurality of fasteners,
Wherein the strut support plate includes a plurality of fourth through holes into which the plurality of fasteners can be inserted,
Wherein the strut support plate is fastenable to the casing by the plurality of fasteners. 16. The method of claim 15,
Wherein at least one of the plurality of strut support plates has a different size than the other strut support plates. A plurality of casing legs connected to a lower portion of the casing and extending downward;
A casing support plate vertically coupled to the casing leg;
A support including a ring-shaped protrusion and a space portion therein and coupled to the casing support plate to support the casing support plate;
A bearing portion provided at an inner center of the casing;
A plurality of struts, one end of which is coupled to the bearing and the other end is coupled to the casing to connect the casing and the bearing; And
And a strut support plate detachably coupled to each of the plurality of struts and the casing. 20. The method of claim 19,
Further comprising a plurality of fasteners,
Wherein the casing support plate includes a first through hole and a plurality of second through holes into which the plurality of fasteners can be inserted, the fastening hole being fastenable to the support by the plurality of fasteners,
Wherein the casing leg includes a coupling member formed at a lower end thereof and insertable into the first through hole, wherein the coupling member includes a thread at an end thereof, and the nut can be assembled to the casing support plate.

Images