Gas turbine and cross flame tube structure thereof

Abstract

The utility model discloses a gas turbine and a cross flame tube structure thereof, and relates to the technical field of gas turbines. The cross flame tube structure comprises a protective sleeve arranged between the first flame tube and the second flame tube; the cross flame tube is movably arranged in the protective sleeve in a sleeving manner and is used for communicating the first flame tube with the second flame tube; and the limiting structure is arranged between the protective sleeve and the cross flame tube and is used for limiting the protective sleeve and the cross flame tube to generate circumferential relative rotation. Through the arrangement of the protective sleeve, the cross flame tube and the limiting structure, it can be guaranteed that the cross flame tube and the flame tube are coaxial, that is, the cross flame tube and the flame tube are not subjected to large-degree friction or clamping stagnation, and the service life of the cross flame tube can be effectively prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of gas turbines, and in particular to a gas turbine and a cross-fire tube structure thereof. Background Art

[0002] Low-emission gas turbines for ground use mostly use annular tube or branch tube combustion chamber structures. Figure 1 As shown, the flame tubes 1 are evenly distributed along the axis of the engine (i.e., perpendicular to the paper), and each flame tube works as a small combustion chamber. The number of flame tubes ranges from a few to dozens. Generally, only one or two flame tubes are provided with an ignition device, and all the flame tubes 1 are ignited through the flame transmission of the cross-flame tubes 2 between the flame tubes, and each cross-flame tube 2 also needs to balance the pressure between the flame tubes 1.

[0003] The prior art usually uses an elastic sheet limiting tube structure or a bellows structure as a cross-flame tube. Since the cross-flame tube works in a high temperature and high pressure environment, long-term use will cause vibration wear and deformation of the elastic sheet limiting tube structure, which will lead to leakage or ablation of the cross-flame tube. In addition, the elastic sheet is easy to deform at high temperatures, and after losing the limiting function, it will cause the cross-flame tube to get stuck and wear more severely. The bellows structure is fragile, and its service life in a high temperature environment is lower than that of a solid circular tube. In other words, the service life of the cross-flame tube in the prior art is relatively low. Utility Model Content

[0004] The purpose of the present application is to provide a gas turbine and a cross-fire tube structure thereof to solve the technical problem of the low service life of the cross-fire tube in the prior art.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides a cross-fire tube structure, which is applied to a gas turbine, wherein the gas turbine comprises a first flame tube and a second flame tube, and the cross-fire tube structure comprises:

[0007] A protective sleeve, disposed between the first flame tube and the second flame tube;

[0008] A flame connecting tube, movably sleeved inside the protective sleeve, used for connecting the first flame tube and the second flame tube;

[0009] The limiting structure is arranged between the protection sleeve and the cross-flame tube, and is used for limiting the relative rotation of the protection sleeve and the cross-flame tube in the circumferential direction.

[0010] As a specific solution in the technical solution of this application, the limiting structure includes:

[0011] A plurality of slide grooves are arranged on the inner wall of the protective sleeve; each slide groove extends along a first direction, and the first direction is parallel to the axis of the protective sleeve;

[0012] A support block is arranged on the outer wall of the cross-fire tube and corresponds to each chute one by one; the support block is matched with the corresponding chute.

[0013] As a specific solution in the technical solution of this application, the limiting structure includes:

[0014] A plurality of slide grooves are arranged on the inner wall of the cross-fire tube; each slide groove extends along a first direction;

[0015] A support block is arranged on the inner wall of the protective sleeve and corresponds to each slide groove one by one; the support block is adapted to the corresponding slide groove.

[0016] As a specific solution in the technical solution of the present application, limit rings are provided at both ends of the cross-flame tube, and the limit rings are used to limit the relative displacement of the cross-flame tube, the first flame tube and the second flame tube along the first direction.

[0017] As a specific solution in the technical solution of the present application, the protective sleeve is respectively welded and fixed to the first flame tube and the second flame tube; or, the protective sleeve is respectively screwed and fixed to the first flame tube and the second flame tube through a flange.

[0018] As a specific solution in the technical solution of the present application, a sealing ring is provided on the outside of the protective sleeve.

[0019] As a specific solution in the technical solution of this application, the cross-flame tube includes:

[0020] Combined flame outer tube;

[0021] The inner cross-flame tube forms a movable sleeve connection with the outer cross-flame tube along a first direction; the maximum tube length formed by the outer cross-flame tube and the inner cross-flame tube is greater than the distance between the first flame tube and the second flame tube; and the minimum tube length formed by the outer cross-flame tube and the inner cross-flame tube is less than the distance between the first flame tube and the second flame tube.

[0022] As a specific solution in the technical solution of the present application, the protective sleeve is further provided with a positioning bolt, and the cross-flame outer tube and the cross-flame inner tube are both provided with anti-cross-linking holes, and the anti-cross-linking holes are adapted to the positioning bolts.

[0023] In a second aspect, the present application provides a gas turbine, which includes a cross-fire tube structure as described in any one of the first aspects.

[0024] Compared with the prior art, the beneficial effects of this application are:

[0025] The present application can ensure that the cross-flame tube and the flame tube are coaxial by providing a protective sleeve, a cross-flame tube and a limiting structure, that is, the cross-flame tube will neither rub against the flame tube to a large extent nor get stuck with the flame tube, which can effectively improve the service life of the cross-flame tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a combustion chamber structure in the prior art;

[0027] Figure 2 A cross-sectional schematic diagram of a cross-flame tube structure proposed in an embodiment of the present application;

[0028] Figure 3 A cross-sectional schematic diagram of a cross-flame tube proposed in an embodiment of the present application;

[0029] Figure 4 for Figure 2 Cross-sectional view of the middle protective sleeve and cross-fire tube along line AA.

[0030] In the figure: 1, flame tube; 11, first flame tube; 12, second flame tube; 2, cross-flame tube; 21, protective sleeve; 22, cross-flame outer tube; 23, cross-flame inner tube; 24, positioning bolt; 25, limit ring; 26, flange; 27, sealing ring; 28, slide groove; 29, support block; 210, remaining pipe groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that, in the description of the present application, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0033] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0034] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not require further detailed discussion and description in the description of the subsequent drawings.

[0035] In order to solve the technical problems raised by the background technology, the present application proposes an embodiment of a cross-fire tube structure, which is applied to a gas turbine, such as Figure 1 As shown, the gas turbine includes a plurality of flame tubes 1. In the embodiment of the present application, any two adjacent flame tubes 1 among the plurality of flame tubes 1 are named as the first flame tube 11 and the second flame tube 12 respectively. The cross-flame tube structure includes a protective sleeve 21, a cross-flame tube and a limiting structure. Among them, the protective sleeve 21 is arranged between the first flame tube 11 and the second flame tube 12. The cross-flame tube is movably sleeved inside the protective sleeve 21, and the cross-flame tube is used to connect the first flame tube 11 and the second flame tube 12. The limiting structure is arranged between the protective sleeve 21 and the cross-flame tube, and is used to limit the circumferential relative rotation of the protective sleeve 21 and the cross-flame tube.

[0036] It should be clear that in the embodiments of the present application, Figure 1 As shown, the protective sleeve 21 is located outside the cross-flame tube (i.e., the cross-flame outer tube 22 and the cross-flame inner tube 23), which not only plays a sealing role to prevent fuel leakage from the connection between adjacent flame tubes (i.e., the first flame tube 11 and the second flame tube 12), but also plays a role in centering the cross-flame tube to prevent the cross-flame tube from getting stuck with the flame tube after being worn and deformed.

[0037] It is easy to understand that in the embodiment of the present application, no elastic sheet is used to limit the cross-flame tube so that the cross-flame tube conflicts with the flame tube. That is to say, in the embodiment of the present application, the friction between the cross-flame tube and the flame tube is almost zero. In other words, during long-term use, since the friction between the solid cross-flame tube and the flame tube is small, the wear between the cross-flame tube and the flame tube is small. Compared with the cross-flame tube in the prior art, the cross-flame tube proposed in this embodiment has a longer service life. Since the embodiment of the present application also does not provide an elastic sheet, there will be no phenomenon that the cross-flame tube is stuck due to the deformation of the elastic sheet due to heat.

[0038] In an embodiment of the present application, the limiting structure may be any structure that can limit the circumferential relative rotation between the protective sleeve 21 and the cross-flame tube. For example, in one embodiment of the present application, the limiting structure may include a plurality of slide grooves 28 provided on the inner wall of the protective sleeve 21, each of which extends along a first direction, and the first direction is parallel to the axis of the protective sleeve 21. Support blocks 29 corresponding to each slide groove 28 and provided on the outer wall of the cross-flame tube; the support blocks 29 are adapted to the corresponding slide grooves 28. In another embodiment of the present application, the limiting structure may include a plurality of slide grooves 28 provided on the inner wall of the cross-flame tube; each of which extends along a first direction; support blocks 29 corresponding to each slide groove 28 and provided on the inner wall of the protective sleeve 21; the support blocks 29 are adapted to the corresponding slide grooves 28. As Figure 4 As shown, due to the limiting effect formed between the support block 29 and the slide groove 28, the protective sleeve 21 and the cross-fire tube can only move relative to each other along the first direction, and cannot produce circumferential relative rotation. The protective sleeve 21 is fixed to the flame tube, and the support block 29 and the slide groove 28 can always ensure that the protective sleeve 21 and the cross-fire tube are coaxial, which can effectively reduce the wear of the two ends of the cross-fire tube and the flame tube when the gas turbine is running, and reduce the jamming caused by the cross-fire tube and the flame tube being not coaxial. It can also effectively avoid the wear and jamming caused by the cross-fire outer tube 22 and the cross-fire inner tube 23 in the following text due to the non-coaxiality.

[0039] It should be understood that, in the embodiment of the present application, the support block 29 is adapted to the corresponding slide groove 28 in the sense that the support block 29 can slide along the slide groove 28 in a first direction, and the support block 29 is located in the slide groove 28 without shaking.

[0040] As can be seen from the foregoing, the cross-fire tube can slide along the first direction. In order to prevent the cross-fire tube from sliding into the first flame tube 11 or the second flame tube 12 during use, in the embodiment of the present application, both ends of the cross-fire tube are provided with limit rings 25, which are used to limit the relative displacement of the cross-fire tube, the first flame tube 11 and the second flame tube 12 along the first direction. Figure 2 As shown, by setting the limiting ring 25 , the cross-fire tube can only be located between the first flame tube 11 and the second flame tube 12 , and it can neither slide into the interior of the first flame tube 11 nor into the interior of the second flame tube 12 .

[0041] In the embodiment of the present application, the protective sleeve 21 can be fixed to the first flame tube 11 and the second flame tube 12 in any manner. For example, in one embodiment of the present application, the protective sleeve 21 can be fixed to the first flame tube 11 and the second flame tube 12 by welding. In another embodiment of the present application, Figure 2 As shown, the protective sleeve 21 can be screwed and fixed to the first flame tube 11 and the second flame tube 12 respectively through the flange 26.

[0042] As can be seen from the foregoing, in the embodiment of the present application, the protective sleeve 21 can play a sealing role to prevent fuel from overflowing from the connection between the first flame tube 11 and the second flame tube 12. In order to further improve the sealing performance of the protective sleeve 21, in one embodiment of the present application, a sealing ring 27 is further provided on the outside of the protective sleeve 21. Figure 2 As shown, the provision of the sealing ring 27 can improve the sealing performance between the protective sleeve 21 and the first flame tube 11 and the second flame tube 12, respectively, and further prevent gas leakage.

[0043] In order to facilitate the disassembly of the cross-fire tube, in one embodiment of the present application, the cross-fire tube includes a cross-fire outer tube 22 and a cross-fire inner tube 23. The cross-fire inner tube 23 forms a movable sleeve with the cross-fire outer tube 22 along the first direction; the maximum tube length formed by the cross-fire outer tube 22 and the cross-fire inner tube 23 is greater than the distance between the first flame tube 11 and the second flame tube 12; the minimum tube length formed by the cross-fire outer tube 22 and the cross-fire inner tube 23 is less than the distance between the first flame tube 11 and the second flame tube 12.

[0044] It should be clear that if Figure 2 As shown, the distance between the first flame tube 11 and the second flame tube 12 is Figure 2 The distance S1 is shown. Figure 3 As shown, the tube length formed by the cross-fire outer tube 22 and the cross-fire inner tube 23 is Figure 3 The distance S2 shown. Since the cross-flame inner tube 23 and the cross-flame outer tube 22 form a movable sleeve along the first direction, the tube length distance S2 of the cross-flame outer tube 22 and the cross-flame inner tube 23 along the first direction is adjustable. When in use, the distance S2 is adjusted to be greater than the distance S1, and the cross-flame outer tube 22 and the cross-flame inner tube 23 are restricted between the first flame tube 11 and the second flame tube 12, and the cross-flame tube (that is, the cross-flame outer tube 22 and the cross-flame inner tube 23) cannot be separated from the first flame tube 11 and the second flame tube 12. If the cross-flame outer tube 22 and the cross-flame inner tube 23 are to be disassembled, the distance S2 is adjusted to be less than the distance S1, and the cross-flame outer tube 22 and the cross-flame inner tube 23 can be removed from between the first flame tube 11 and the second flame tube 12.

[0045] In the embodiment of the present application, the cross-flame outer tube 22 and the cross-flame inner tube 23 can form an interference fit, and the distance S2 can be adjusted by applying external force to the cross-flame outer tube 22 and the cross-flame inner tube 23. In order to stabilize the tube length of the cross-flame tube formed by the cross-flame outer tube 22 and the cross-flame inner tube 23 during long-term use, in one embodiment of the present application, the protective sleeve 21 is also provided with a positioning bolt 24, and the cross-flame outer tube 22 and the cross-flame inner tube 23 are both provided with anti-cross-holes, which are adapted to the positioning bolt 24. Figure 2As shown, when in use, the protective sleeve 21, the cross-fire outer tube 22 and the cross-fire inner tube 23 are screwed and fixed in sequence by the positioning bolts 24. The positioning bolts 24 can ensure that the cross-fire outer tube 22 and the cross-fire inner tube 23 cannot produce relative displacement in the axial direction, that is, the tube length formed by the cross-fire outer tube 22 and the cross-fire inner tube 23 can be stable.

[0046] In one embodiment of the present application, Figure 3 As shown, it is assumed that the depth of the cross-fire outer tube 22 inserted into the first flame tube 11 is a distance h1; the depth of the cross-fire inner tube 23 inserted into the second flame tube 12 is a distance h2; after the cross-fire outer tube 22 and the cross-fire inner tube 23 are screwed and fixed by the positioning bolts 24, the length of the remaining tube groove 210 between the cross-fire outer tube 22 and the cross-fire inner tube 23 along the axial direction is a distance H. In order to ensure that the cross-fire outer tube 22 and the cross-fire inner tube 23 can be smoothly removed from between the first flame tube 11 and the second flame tube 12, as shown in FIG. Figure 2 and Figure 3 As shown, after the cross-fire outer tube 22 and the cross-fire inner tube 23 are screwed and fixed by the positioning bolts 24, the length of the distance H is greater than the sum of the lengths of the distance h1 and the distance h2.

[0047] It should be clear that the embodiment of the cross-flame tube structure proposed in the present application can ensure that the cross-flame tube is coaxial with the flame tube through the provision of a protective sleeve, a cross-flame tube and a limiting structure, that is, the cross-flame tube will neither have a large degree of friction with the flame tube nor get stuck with the flame tube, which can effectively improve the service life of the cross-flame tube.

[0048] After introducing all the embodiments of the cross-fire tube structure proposed in the present application, an embodiment of a gas turbine is proposed below. Specifically, the gas turbine includes the cross-fire tube structure proposed in any one of the above embodiments.

[0049] It should be clear that since the gas turbine embodiment proposed in the present application has the cross-flame tube structure proposed in the above-mentioned embodiment, the gas turbine embodiment proposed in the present application can ensure that the cross-flame tube is coaxial with the flame tube through the arrangement of the protective sleeve, the cross-flame tube and the limiting structure, that is, the cross-flame tube will neither have a large degree of friction with the flame tube nor get stuck with the flame tube, which can effectively improve the service life of the cross-flame tube.

[0050] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A cross-fire tube structure, applied to a gas turbine, the gas turbine comprising a first flame tube (11) and a second flame tube (12), characterized in that: The cross-fire tube structure comprises: A protective sleeve (21) is arranged between the first flame tube (11) and the second flame tube (12); A flame connecting tube, movably sleeved inside the protective sleeve (21), and used for connecting the first flame tube (11) and the second flame tube (12); A limiting structure is arranged between the protective sleeve (21) and the cross-flame tube, and is used to limit the relative rotation of the protective sleeve (21) and the cross-flame tube in the circumferential direction.

2. The cross-fire tube structure according to claim 1, characterized in that: The limiting structure comprises: A plurality of slide grooves (28) are arranged on the inner wall of the protective sleeve (21); each slide groove (28) extends along a first direction, and the first direction is parallel to the axis of the protective sleeve (21); A support block (29) corresponds to each slide groove (28) one by one and is arranged on the outer wall of the cross-fire tube; the support block (29) is adapted to the corresponding slide groove (28).

3. The cross-fire tube structure according to claim 1, characterized in that: The limiting structure comprises: A plurality of slide grooves (28) are arranged on the inner wall of the cross-fire tube; each slide groove (28) extends along a first direction; A support block (29) corresponds to each slide groove (28) one by one and is arranged on the inner wall of the protective sleeve (21); the support block (29) is adapted to the corresponding slide groove (28).

4. The cross-fire tube structure according to claim 1, characterized in that: Limiting rings (25) are provided at both ends of the cross-flame tube, and the limiting rings (25) are used to limit the relative displacement of the cross-flame tube, the first flame tube (11) and the second flame tube (12) along a first direction.

5. The cross-fire tube structure according to claim 1, characterized in that: The protective sleeve (21) is respectively fixed to the first flame tube (11) and the second flame tube (12) by welding; or, the protective sleeve (21) is respectively fixed to the first flame tube (11) and the second flame tube (12) by screwing via a flange (26).

6. The cross-fire tube structure according to claim 5, characterized in that: A sealing ring (27) is arranged outside the protective sleeve (21).

7. The cross-fire tube structure according to any one of claims 1 to 6, characterized in that: The cross-fire tube comprises: Cross-flame outer tube (22); The inner cross-flame tube (23) forms a movable sleeve connection with the outer cross-flame tube (22) along a first direction; the maximum tube length formed by the outer cross-flame tube (22) and the inner cross-flame tube (23) is greater than the distance between the first flame tube (11) and the second flame tube (12); and the minimum tube length formed by the outer cross-flame tube (22) and the inner cross-flame tube (23) is less than the distance between the first flame tube (11) and the second flame tube (12).

8. The cross-fire tube structure according to claim 7, characterized in that: The protective sleeve (21) is also provided with a positioning bolt (24), and both the cross-fire outer tube (22) and the cross-fire inner tube (23) are provided with anti-cross-fire holes, and the anti-cross-fire holes are adapted to the positioning bolt (24).

9. A gas turbine, characterized in that: It comprises the cross-fire tube structure as claimed in any one of claims 1 to 8.

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