JPS6038530A - Combustor of gas turbine - Google Patents

Abstract

PURPOSE:To make fitting between an inner cylinder of a combustor and a transition piece reliable, by a method wherein a spring having elasticity in a circumferential and radial directions is formed by making a cylindrical spring into an annular state, which is fitted in the inner cylinder of the combustor, the rings are inserted on an upstream and down stream sides of the spring and it is so comstituted that the annular spring is turned between the rings in an axial direction. CONSTITUTION:Stop rings 22a, 22b are fixed to an external circumference of a downstream end part 21 of an inner cylinder 20 of a combustor. Positions of the stop rings 22a, 22b in an axial direction have been fixed by an insertion margine between a transition piece 23 and the inner cylinder 20 of the combustor, the upstream side stop ring 22a is positioned in the vicinity of an inlet part 23a of the transition piece 23 and the downstream side stop ring 22b is provided in the vicinity of a downstream end part 21 of the inner cylinder 20 of the combustor. Thicknesses of the stop rings 22a, 22b are made into ones of about a half of a gap between the transition piece 23 and the inner cylinder 20 of the combustor, and it is so constituted that excessive wear or deformation and further disconnection of the annular spring 24 do not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a combustor for a gas turbine, and more particularly to an improvement in a cylindrical combustor.

[Background of the invention]

The combustion ring of a gas turbine usually consists of a cylindrical combustor inner cylinder that burns fuel and generates combustion gas, and a transition piece that guides the combustion gas to the nozzle in the turbine section without loss. There is. Since the combustor inner cylinder and the trunk have different purposes, they each have a unique shape, and for maintenance and inspection purposes, they are always manufactured separately and are not integrated. However, it is necessary to connect the two by mechanical means, and generally they are placed in contact via a leaf spring. VC is used to escape thermal expansion between the two and to absorb vibrations caused by combustion during operation. VC is used to seal the air, but it is always prone to malfunctions and reduces reliability. It has the disadvantage of being scarce.

Figure 1 is a detailed diagram of the area around the combustor of a gas turbine.

Air compressed by a gas turbine compressor part 2
passes through the turbine casing 3, flows into the combustor outer cylinder 4, and flows into the combustor 5. Here, the fuel sprayed through the fuel nozzle 6 is mixed and spread, ignited by the spark plug 7, and combusted. The combustion scum 8 flows into the turbine section 10 through the combustor inner cylinder 5 and the transition piece 9, rotates the rotor 11tl, and is discharged into the atmosphere as waste scum 12. As shown in FIG. 2, the combustor inner cylinder 5 and the transition piece 9 are arranged so that the end 5a of the combustor inner cylinder 5 located on the upstream side is located on the downstream side so that the combustion gas 8 flows smoothly. It has a structure in which it is inserted into the entrance portion 9a of the transition piece 90. In addition, a plate is installed at this joint to prevent compressed air 13 from flowing in, and to absorb expansion due to thermal expansion in the radial and axial directions of the combustor inner space 5 and transition 7 bead 90 during operation. The spring is inserted. The details are shown in FIG. This leaf spring 14 is attached to the outer periphery of the end 5a of the combustor inner cylinder 5, and is fixed at the downstream side 14a by means such as spot bath welding. When assembled, the combustor is compressed to the extent that the centers of the combustor inner cylinder and the 7 pieces of the combustor are aligned. In order to facilitate insertion during assembly, the leaf spring 14 has an arcuate shape, and has a plurality of K slits as shown in FIG. 4 to accommodate changes in circumference due to radial shrinkage. 15 are provided in parallel. Usually, this plate nozzle 14 is made of a high-temperature spring material, and after being formed by a press or the like, it is subjected to an aging heat treatment and used as a hard nozzle. Since a number of sulins (15) are provided, when installed in the combustor inner cylinder 5, as shown in FIG.
Polygonal board (ne 14), transition 7
Since the entrance portion of the bead 9 is circular, the polarization is localized. If the operation is carried out in this state, vibrations caused by combustion or movement (sliding) between the inner surface of the combustor and the transition bead due to thermal expansion and contraction caused by turning back during starting and stopping will occur as shown in Figure 5. , Excessive wear 17 occurred locally, and the plate notch 14 broke off at the arcuate furthest point 16 of the temporary spring 14 and flowed into the turbine section. Efficiency decreased due to a large amount of compressed air flowing in. There is a fear that it will cause problems such as causing problems.

[Purpose of the invention]

An object of the present invention is to provide a seal structure for a combustor that can securely fit the combustor inner cylinder and the transition piece and improve reliability.

[Summary of the invention]

The gist of the present invention is to form a rod-shaped spring in the form of a ring, form a spring metal that can be elastically compressed in the circumferential direction and radial direction, fit it into the combustor inner cylinder, insert the spring metal on the upstream and downstream sides thereof, The reason for this is that the rim/g-shaped groove is rotated in the axial direction.

[Embodiments of the invention]

FIG. 6 is a perspective view of one embodiment of the present invention.

Stop rings 22a and 22b are attached to the outer periphery of the downstream end 21 of the combustor inner space 20.

As shown in FIG. 7, the axial positions of the stop rings 22a and 22b are determined by the insertion distance between the tongue/position piece 23 and the combustor inner surface 20, and the upstream stop ring 22a is The stop ring 2 on the downstream side is located near the 7-piece 230 population section 23H.
2b is provided near the downstream end 21 of the combustion chamber 20.

Y/H, the thickness of the stop rings 22a+22b should be approximately 1/2 of the gap between the transinjyo 7 bead 23 and the combustor inner cylinder 20. 24 is trying to get out of the way. Between the stop rings 22a and 22b, there is a certain amount of elasticity in the circumferential direction, and also elasticity in the radial direction, like a hollow spring packing! -Ringby 24 is the matchmaker. Konosu/Gubane 24 is requested by Tora/Ji/Yo 7 Peace.
As shown in FIG. 7), the height of the gap between the tiger/position piece 23 and the combustor inner surface 20 is increased to prevent compression from being carried out by hunters.

For this reason, when compressing VL, the slit sinks like in a conventional leaf spring and the IC is prevented from being lost. In addition, since the ring spring 24 has a circular surface,
Even if heat elongation occurs between the combustor inner cylinder 20 and the tiger/jizoyo/piece 23 during operation, the su/gubai 24 itself rotates as shown by the arrow in the figure, so it is not possible to There is no slippage and almost no M bills occur.

Similarly, the stop ring is also effective in preventing the stop ring 24 from coming off the first socket in the combustor due to axial movement. Furthermore, because the ring spring is circular, it is very easy to assemble it into the tiger/gin shift piece in front of the combustor because the spring itself rotates. The ring spring is
It is a commercially available high-pressure metal ring packing that can be obtained at a very low price if the dimensions are determined to fit the combustor inner cylinder and some care is taken with the materials used. In addition, special molding and heat treatment are not required, and since it is not completely fixed to the cylinder or combustor inner cylinder, it is easy to remove and install the device.

〔Effect of the invention〕

According to the present invention, since the seal is perfect and wear is extremely low, reliability during long-term operation of the gas turbine can be improved. Furthermore, the combustor can be easily assembled, and the number of man-hours for maintenance and inspection can be reduced.

[Brief explanation of drawings]

Figure 1 is a Uf side view of the combustor winding, Figure 2 is a sectional view of the connection between the combustor interior and the transition/piece, and Figure 3 is
A detailed view of part ■ in Fig. 2, Fig. 4(a) is a perspective view of a conventional leaf spring, Fig. 4(b) is a sectional view taken along the line IVB-■B in Fig. 4(a), Fig. 5 (a) is a perspective view of a conventional leaf spring installed, FIG. 5(b) is a front view of the leaf spring part, FIG. 6 is a perspective view of an embodiment of the present invention, and FIG. 7 is a perspective view of the present invention. This is a cross-sectional view of the connection part. 20... Directly inside the combustor, 21... Downstream end, 22a.
...Stop ring, 22b...Stop ring, 2
3...Tranogition piece, 23a...Population department,
24...Figure 1 Figure 20 Figure 3 Figure 4 (cL) (4) Figure S ((L) ('e-)

Claims (1)

[Claims] 1. A cast turbine combustor characterized in that, in a fitting part of the cast turbine combustor, ring-shaped springs with a circular inner wall cross section are arranged on the upstream side and the downstream side and positioned by stop rings.