KR101080932B1 - a thermal deformation compensating apparatus of a gas turbine - Google Patents

Abstract

The present invention relates to a strut heat deformation compensation device of a gas turbine which prevents the strut and the case from being deformed or damaged due to thermal deformation due to a temperature difference between the inside and the outside of the case, and the compressor, the combustor, and the turbine are sequentially arranged on the same axis. Is coupled to, the case is provided with a cylindrical case for exhaust gas discharged to the outside of the rear, the inner operating central portion of the case is provided with a rotary actuator including a bearing and a rotating shaft, for supporting between the case and the rotary actuator In the gas turbine provided with a strut, it is configured to include a strut fixing means for allowing the end of the strut and the case to be coupled in a spaced state and at the same time to actively absorb the deviation due to thermal deformation.

Accordingly, the stress applied to the gas turbine case and the strut is reduced, and as a result, the life of the gas turbine is longer, and the gas turbine is stably operated.

Gas Turbine, Outlet, Case, Strut, Heat Deflection

Description

Structural deformation compensator of a gas turbine {a thermal deformation compensating apparatus of a gas turbine}

The present invention relates to a gas turbine, and more particularly, to a strut heat deformation compensation device of a gas turbine, which prevents damage to the strut and the case due to thermal deformation due to a temperature difference inside and outside the case.

In general, a gas turbine is a type of internal combustion engine that injects and rotates a combustion gas of high temperature and high pressure to a turbine, and converts thermal energy into mechanical energy. As shown in FIG. Compressed air is combusted by the combustor 20 to combust the fuel to a high temperature and high pressure state, and the combustion gas is supplied to the turbine 30 to expand in the turbine 30 and simultaneously expand the turbine 30. After rotating, part of the rotational energy is used to operate the compressor 10 again, and the rest is used to rotate a propeller of a generator or an aircraft, a screw of a ship, and the like, and is used for various purposes.

Among these gas turbines, in particular, the gas turbine used for power generation is such that the rotating shaft 51 coupled to the turbine 30 is extended to the rear side of the turbine 30 or the front side of the compressor 10 to be coupled to a conventional generator. At this time, the cylindrical case 40 is provided to guide the exhaust gas discharged from the gas turbine, the rotary shaft 51 is inserted into the inner central portion of the case 40, the rotary shaft 51 on the outer surface of the rotary shaft 51 The rotating operation unit 50 is composed of a bearing 52 and a bearing case for supporting ().

In addition, as shown in FIG. 2, the case 40 and the rotary operation unit 50 maintain a predetermined distance as a space is formed through which the exhaust gas is discharged into the space between the case 40 and the rotary operation unit 50. The lower end is fixed to the rotary operation unit 50 so as to be firmly fixed, and the upper end is provided with a plurality of struts 60 fixed to the case 40 to ensure stable operation of the gas turbine.

However, as the strut is usually formed of a metal rod, etc., the strut expands while being heated by the high temperature exhaust gas emitted from the turbine. This results in a difference in thermal strain due to the temperature difference, which causes high stress on the strut and the case, and damages the strut or damages the case when the gas turbine is operated for a long time. There was this.

Accordingly, the present invention has been made to solve the conventional problems as described above, the object of the gas turbine is to prevent the damage to the strut and the case by the difference in the amount of heat deformation due to the temperature difference between the inside and outside of the case To provide strut heat distortion compensation device of

In addition, the object of the present invention is to provide a compensation for the thermal deformation while the strut is firmly fixed in a simple structure.

In addition, an object of the present invention is to ensure the operability of the gas turbine support according to the thermal expansion of the strut while corresponding to the weight of the engine is changed by the change in the bearing capacity of the elastic support member.

In addition, an object of the present invention is to provide a solid fixing while making the operation of mounting and replacing the leaf spring in the housing easily.

In addition, an object of the present invention is to reduce the friction generated during the up, down lifting operation of the leaf spring.

In addition, it is an object of the present invention to easily adjust the support height of the leaf spring and the thickness of the leaf spring.

It is also an object of the present invention to minimize the stress applied to the leaf spring.

In addition, an object of the present invention is to ensure that the housing and the case is always firmly coupled to a constant position.

In order to achieve the above object, the present invention is provided with a cylindrical case in which exhaust gas is discharged to the outside of the rear of the gas turbine, a rotary operating unit including a bearing and a rotating shaft in the inner central portion of the case, the case In the gas turbine is provided with a strut for supporting between the rotary actuator and the strut fixing means for allowing the end of the strut and the case is coupled in a spaced state and at the same time to actively absorb the deviation due to thermal deformation Includes, the strut fixing means; is formed on the outer surface of the case is coupled to the upper end of the strut exposed, fixed to the outer surface of the case, a through hole corresponding to the coupling hole is formed in the center, Housing formed with a space portion, the lower end is inserted through the through hole is fastened to the upper end of the strut And it is constituted by a top comprising an elastic support member for supporting the upper and lower movement of the support bolt is coupled to the support bolt, the support bolt disposed inside of the housing resiliently.

delete

In addition, the elastic support member, the bolt insertion hole is formed in the central portion is inserted into the support bolt, the outer circumference is fixed to the housing, characterized in that composed of a plurality of leaf springs arranged up and down.

In addition, the upper inner ring of the housing is fastened is provided with an upper fixing ring for supporting the outer circumference of the upper surface of the leaf spring, the lower fixing ring is inserted into the lower inner surface of the housing to support the outer circumference of the lower surface of the leaf spring Characterized in that provided.

In addition, the head of the support bolt is formed with a larger diameter than the bolt insertion hole of the leaf spring, characterized in that the friction reducing ring is inserted in the space between the lower surface of the head of the support bolt and the leaf spring.

In addition, the height adjustment ring is inserted into the lower side of the leaf spring, the upper surface is supported on the lower surface of the leaf spring, the lower surface is supported on the upper surface of the strut.

In addition, the leaf spring is characterized in that the center portion is bent downward in the cooling state of the gas turbine by the pressing of the support bolt, characterized in that arranged in a flat shape in the high temperature operating state of the gas turbine.

In addition, an insertion protrusion is formed to protrude downward along the periphery of the through hole of the housing and is inserted into the coupling hole. It is done.

Thus, the present invention is provided with strut fixing means for coupling the case and the strut in a spaced apart state, the strut row of the gas turbine to prevent the strut and the case from being damaged by thermal deformation due to the temperature difference between the inside and the outside of the case By providing a strain compensation device, not only the life of the gas turbine becomes longer, but also the effect that the gas turbine operates stably.

In addition, the present invention is a strut fixing means is a simple structure of the housing, the support bolt and the elastic support member to ensure a smooth heat compensation operation while the struts are firmly fixed, the struts by the vibration generated during the operation of the gas turbine While preventing the departure from the case has the effect that the assembly and maintenance is more simple.

In addition, the present invention is to ensure the clearance distance according to the thermal deformation of the strut while maximizing the supporting force of the elastic support member by constituting the plurality of leaf springs, the heat of the case and strut generated during the operation of the gas turbine The gas turbine is more stably operated by allowing the gas turbine engine to be firmly supported even in the amount of deformation.

In addition, the present invention is provided with an upper fixing ring and a lower fixing ring to facilitate the installation and replacement of the plate spring in the housing, while making a solid fixing, the assembly and replacement of various parts, such as struts more easily While it is made, the bearing capacity of the leaf spring is maximized.

In addition, the present invention is provided with a friction reducing ring to reduce the friction generated during the up and down lifting operation of the plate spring and the support bolt, it has an effect of preventing the support bolt and plate spring breakage caused by friction.

In addition, the present invention is provided with a height adjustment ring to easily adjust the support height of the leaf spring, according to the use and operating characteristics of the gas turbine simply adjust the arrangement position of the leaf spring, accordingly the adjustment of the bearing force is made easy Will have an effect.

In addition, the present invention is to make the leaf spring is inclined downward in the cold state to minimize the stress applied to the leaf spring, thereby minimizing the fatigue failure of the leaf spring due to the long time operation of the gas turbine.

In addition, the present invention forms an insertion protrusion and a coupling protrusion to ensure that the housing and the case are always coupled to a constant position to achieve a rigid fixing, to prevent the coupling force of the housing from being moved by vibration and shock to reduce the bearing force. Rather, the engagement angle of the struts is prevented from being distorted, which has the effect of keeping the strut bearing capacity constant.

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

Figure 3 is an exploded perspective view of the main portion showing an embodiment of the present invention, Figure 4 is a longitudinal cross-sectional view of the main portion showing the coupling state of Figure 3, the present invention as shown in the exhaust gas is discharged to the rear outside of the turbine The cylindrical case 40 is provided, the inner center portion of the case 40 is provided with a rotary operating unit 50 including a rotary shaft 51 and a bearing 52 supporting the rotary shaft 51, and a rotary operating unit ( Strut 60 is provided to support the space between the 50 and the case 40, the gas turbine for preventing the strut 60 and the case 40 from being damaged by the thermal deformation of the strut 60 Of the strut 60 thermal strain compensation device.

The case is disposed on the rear side of the gas turbine and is formed in a cylindrical shape to guide the high temperature exhaust gas discharged from the turbine. The center part of the case 40 has a rotating shaft 51 and a rotating shaft coupled to a general generator or a mechanical device. Rotating operation unit 50 consisting of a bearing 52 for supporting the 51 is positioned, both ends of the rotation to ensure that the rotary operation unit 50 is fixed to the inner center of the case 40, respectively A plurality of struts 60 fixed to the operating unit 50 and the case 40 and arranged in a circular shape are provided, and exhaust gas is discharged into a space between the struts 60.

In addition, the strut 60 is to be formed of a conventional metal rod having rigidity, etc., the lower end is fixed to the outer surface of the rotary operation unit 50, the upper end is a coupling hole 41 in the case 40 ) To be exposed through the coupling hole 41, and the case 40 and the strut 60 can be coupled in a spaced state in consideration of the difference in thermal strain, and at the same time, can actively absorb the thermal strain variation. The strut fixing means 70 is provided.

A plurality of strut fixing means 70 is coupled to the outer side surface of the case 40 to correspond to the number of struts 60, and a through hole penetrated to correspond to the coupling hole 41 of the case 40 in the center portion. A support bolt 712 is formed and a housing 71 having a space portion formed therein, and a support bolt disposed at an inner central portion of the housing 71 and having a lower end passing through the through hole 712 and fastened to an upper end of the strut 60. 72 and the elastic support member 73 coupled to the support bolt 72 to elastically support the up and down movement of the support bolt 72.

The housing 71 is integrally fixed to the outer surface of the case 40, and accommodates the support bolt 72 and the elastic support member 73, which will be described later. Is formed in a cylindrical shape, the through hole 712 corresponding to the coupling hole 41 formed in the case 40 through the lower portion is formed in the center so that the upper end of the strut 60 is exposed, the coupling bolt 711 By a fastening or welding by a conventional coupling method such as to be fixed to the outer surface of the case 40.

The support bolt 72 has an upper side is disposed inside the housing 71, the lower end passes through the through hole 712 to be fastened to the upper end of the strut 60 to contract and contract the strut 60 The support bolt 72 is moved in the up and down direction from the inside of the housing 71 as the extension.

The elastic support member 73 is to elastically support the support bolt 72 when the support bolt 72 is moved up and down, one side is supported by the housing 71 or the strut 60 and the other side is supported It is also possible to form a conventional coil spring, etc. supported by the bolt 72, but the bolt insertion hole 732 is inserted into the support bolt 72 is formed in the center to maximize the support rigidity and elastic support, The outer periphery is fixed to the housing 71, it is preferable that the plurality is composed of a leaf spring 731 stacked up and down along the axial direction of the support bolt 72.

Accordingly, when the gas turbine is operated, the length of the strut 60 is extended and the separation distance between the strut 60 and the case 40 is closer, and the support bolt 72 coupled thereto is connected to the housing 71. It is moved from the inside to the upper side, in this state is supported by the elastic support member 73 for elastically supporting the support bolt 72 in the raised position is firmly supported in the raised position to compensate for the expansion due to heat struts ( 60 will be able to firmly support between the case 40 and the rotary operation unit (50).

On the other hand, when the strut 60 is cooled, the distance between the strut 60 and the case 40 is increased while the length of the strut 60 is contracted, and the support bolt 72 coupled thereto is connected to the housing ( 71 is moved from the inside to the lower side, and the support bolt 72 is firmly supported at the lowered position by the elastic support member 73 elastically supporting the support bolt 72 in this state to compensate for shrinkage due to heat. While the strut 60 will be able to firmly support between the case 40 and the rotary operation unit (50).

In addition, the upper inner surface of the housing 71 described above forms a spiral, and is fastened to the upper fixing ring 713 supporting the outer circumference of the upper surface of the leaf spring 731, the lower portion of the housing 71 A lower spring ring 714 supporting the outer circumference of the lower surface of the leaf spring 731 is inserted into the inner surface, and the leaf spring 731 is formed by the upper spring ring 713 and the lower spring ring 714. It is to be firmly fixed to the inside.

Accordingly, assembling or disassembling the leaf spring 731 into the housing 71 is performed simply by detaching the upper fixing ring 713 from the housing 71, thereby further improving the assemblability and providing gas. The maintenance and repair of the turbine is made simple and at the same time it is possible to firmly fix the leaf spring (731).

In addition, the head 721 of the support bolt 72 is to be formed to a diameter larger than the diameter of the bolt insertion hole 732 formed in the leaf spring 731, and the head 721 of the support bolt 72 and The leaf spring 731 is formed in a space between the leaf spring 731 in a normal ring shape and inserted into the friction reducing ring so that the leaf spring 731 is in direct contact with the support bolt 72 and is rubbed. ) And the support bolt 72 is preferably prevented.

In addition, the lower side of the leaf spring 731 is inserted into and coupled to the lower outer surface of the support bolt 72, the upper surface is in close contact with the lower surface of the leaf spring 731, the lower surface is the strut 60 It is preferable that the height adjustment ring 716 supported on the upper surface of the upper surface of the leaf spring 731 be more uniformly supported, and varying the height of the height adjustment ring 716 according to the characteristics of the gas turbine. In the cooling state of the gas turbine, the leaf spring 731 may be selectively determined to be arranged in a curved state or in a planar state.

In this case, in the case of the gas turbine which is typically used for power generation, as the duration of the heating state has a longer characteristic than the duration of the cooling state, as shown in FIG. 5, the central portion of the leaf spring 731 in the cooling state is shown. The plate spring 731 and the strut 60 are coupled to each other in a curved state by forming a downwardly protruding curved surface, and the leaf spring 731 is in a planar state when the strut 60 is expanded by the operation of the gas turbine. It is desirable to minimize the stress applied to the.

On the other hand, when the duration of the cooling state of the gas turbine is longer than the duration of the heating state, the central portion of the leaf spring 371 in the cooling state to form a planar state, the plate spring 731 by the operation of the gas turbine It is desirable to allow the center portion of the to be coupled in a deformed upward state so that the stress of the strut 60 is minimized.

In addition, protruding downward along the periphery of the through hole 712 formed in the lower surface of the housing 71 to form a cylindrical insertion protrusion 717 inserted into the coupling hole 41 formed in the case 40, The case 40 and the housing 71 and the strut 60 are formed on the upper surface of the strut 60 by inserting the inner side of the insertion protrusion 717 into the coupling protrusion 61 to which the support bolt 72 is fastened. It is desirable to be coupled only at a constant position to maximize the supporting force.

1 is a schematic longitudinal sectional view showing an example of a gas turbine.

Figure 2 is a side view showing the shape of the outlet of the gas turbine.

Figure 3 is an exploded perspective view of the main portion showing an embodiment of the present invention.

Figure 4 is a longitudinal sectional view of the main portion showing the coupling state of FIG.

Figure 5 is a schematic front view of the main portion showing a state of use of the present invention.

[Description of Drawings]

10: compressor

20: combustor

30: turbine

40 case

   41: coupling hole

50: rotating operation part

   51: rotating shaft 52: bearing

60: strut

   61: coupling protrusion

70: strut fixing means

   71: housing

      711: coupling bolt 712: through hole

      713: upper fixing ring 714: lower fixing ring

      715: Friction Reduction Ring 716: Height Adjustment Ring

      717: insertion protrusion

   72: support bolt

      721 head

   73: elastic support member

      731: leaf spring 732: bolt insertion hole

Claims (8)

A cylindrical case 40 having exhaust gas is discharged outward from the rear of the gas turbine, and a rotation operation unit 50 including a bearing 52 and a rotating shaft 51 is provided at an inner central portion of the case 40. In the gas turbine provided with a strut 60 for supporting between the case 40 and the rotary operation unit 50, The outer end of the strut 60 is coupled to be spaced apart from the case 40 so as to actively absorb the thermal strain deviation of the strut 60 and the case 40, the thermal strain of the strut 60 By adjusting the separation distance by the strut fixing means 70 to be integrally coupled, The strut fixing means 70; A coupling hole 41 is formed on the outer surface of the case 40 to expose the upper end of the strut 60, and is fixed to the outer surface of the case 40, and corresponds to the coupling hole 41 at a central portion thereof. The through hole 712 is formed, the housing 71 is formed with a space inward, A lower end is inserted through the through hole 712 is fastened and fixed to the upper end of the strut 60, the upper end of the support bolt 72 is disposed inside the housing 71, The strut heat deformation compensation device of a gas turbine including an elastic support member (73) coupled to the support bolt (72) to elastically support the up and down movement of the support bolt (72). delete The method of claim 1, The elastic support member 73, A bolt insertion hole 732 inserted into the support bolt 72 is formed at a central portion thereof, and an outer circumference thereof is fixed to the housing 71, and a plurality of leaf springs 731 are stacked up and down. Strut heat deformation compensation device of gas turbine. The method of claim 3, An upper fixing ring 713 is fastened to an upper inner surface of the housing 71 to support an outer circumference of the upper surface of the leaf spring 731, and is inserted into a lower inner surface of the housing 71 so that the leaf spring ( Strut heat deformation compensation device of the gas turbine, characterized in that the lower fixing ring 714 for supporting the outer periphery of the lower surface of the 731. The method of claim 3, The head 721 of the support bolt 72 is formed with a diameter larger than the bolt insertion hole 732 of the leaf spring 731, the lower surface of the head 721 of the support bolt 72 and the leaf spring ( Strut heat deformation compensation device of the gas turbine, characterized in that the friction reducing ring 715 is inserted into the space between the 731. The method of claim 5, The height adjustment ring 716 is inserted into the lower side of the leaf spring 731, the upper surface is supported on the lower surface of the leaf spring 731, the lower surface is supported on the upper surface of the strut (60). Strut heat deformation compensation device of a gas turbine. The method of claim 6, The leaf spring 731 is bent downward in the cooling state of the gas turbine by the pressing of the support bolt 72, the gas turbine characterized in that arranged in a flat shape in the high temperature operating state of the gas turbine Strut heat deflection compensation device. The method according to any one of claims 1 or 3 to 7, An insertion protrusion 717 protruding downward along the circumference of the through hole 712 of the housing 71 and inserted into the coupling hole 41 is formed, and the insertion protrusion 717 is formed on an upper surface of the strut 60. Strut heat deformation compensation device of a gas turbine, characterized in that the coupling protrusion 61 is inserted into the support bolt 72 is fastened to the inside of the.

Images