Gas turbine connecting device

Abstract

The invention provides a gas turbine connecting device, the gas turbine comprises a first air cylinder part, a second air cylinder part and a connecting device, the first air cylinder part is connected with the second air cylinder part, the gas turbine further comprises a second connecting piece, the connecting device is fixed with the first air cylinder part, and the connecting device is fixed with the second air cylinder part. The connecting device is connected with the second air cylinder part through the second connecting piece, a gap exists between the connecting device and the second air cylinder part, and the second connecting piece can provide force pointing to the connecting face of the first air cylinder part and the second air cylinder part for the second air cylinder part. The force pointing to the connecting face is applied to the second air cylinder part, the cable-stayed effect is achieved, the screw hole design originally occupying the radial space is replaced, and therefore the space is saved, and radial interference is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a gas turbine connecting device. Background Art

[0002] The structure of the gas turbine compressor test piece mainly includes an intake chamber, an intake cylinder, a compressor cylinder, an exhaust cylinder, etc. The air enters the intake cylinder through the intake chamber, then enters the compressor cylinder and is pressurized by the blades, and finally discharged through the exhaust cylinder. When the air flow passes through the intake cylinder part, the inner flow channel diameter shrinks significantly at the rear of the inner ring of the intake cylinder, and then tends to be flat and expands. The inside of the upper inner ring of the intake cylinder is close to the bearing box cover. The bearing box cover and the lower inner ring of the intake cylinder are assembled and connected at the horizontal center plane, and together provide support and necessary lubricating oil chambers for the bearings and rotors. In order to prevent the lubricating oil in the chamber from overflowing along the center plane, a track groove is usually provided at the center plane of the lower inner ring of the intake cylinder, and a sealing strip is installed inside. When the bearing box cover and the lower inner ring of the intake cylinder are assembled and connected by screws at the horizontal center plane, the center plane of the bearing box cover presses the sealing strip to achieve sealing. Such as Figure 1 As shown in the figure, the sealing track groove and the screw holes of the center plane are distributed radially, with the track groove inside and the screw holes outside. The screw holes on the bearing box cover are usually distributed on the bearing box cover flange.

[0003] In the prior art, CN114856821A proposes a bearing seat and a gas turbine. The bearing seat includes two seat bodies that are opposite to each other at a center plane, at least one of which is provided with a sealing groove at the center plane, and an air inlet hole at the seat body. The air inlet end of the air inlet hole passes through the outer surface of the seat body, and the air outlet end of the air inlet hole passes through the sealing groove, so that sealing gas is transported into the sealing groove through the air inlet hole. The gas turbine includes the bearing seat. The bearing seat and the gas turbine have a sealing groove at the center plane of the bearing seat and continuously supply sealing gas into the sealing groove. The pressure of the sealing gas is higher than the internal pressure of the bearing seat, so that the high-pressure flow of the sealing gas in the gap between the center planes can prevent the lubricating oil, oil smoke, and oil mist inside the bearing seat from leaking through the center plane.

[0004] However, existing solutions present the following technical issues: When the inner flow passage at the rear of the intake cylinder contracts significantly or the bearing is adjusted backward, radial space becomes very limited, making interference more likely. This is because the radial space requirements for the chamber must be met simultaneously with the radial distribution requirements of the track grooves before the screw holes, and the requirement that the bearing housing cover flange does not interfere with the inner ring of the intake cylinder. This can lead to interference when the inner flow passage contracts significantly or the bearing is adjusted backward. Summary of the Invention

[0005] The purpose of the present invention is to solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned objectives, the present invention proposes a gas turbine connecting device, wherein the gas turbine includes a first cylinder portion, a second cylinder portion and a connecting device, wherein the first cylinder portion and the second cylinder portion are connected, and the gas turbine also includes a second connecting member, wherein the connecting device is fixed to the first cylinder portion, and the connecting device is connected to the second cylinder portion via the second connecting member, and a gap exists between the connecting device and the second cylinder portion, and the second connecting member can provide the second cylinder portion with a force directed toward the connecting surface between the first cylinder portion and the second cylinder portion.

[0007] Furthermore, the gas turbine also includes a first connecting member, the connecting device is fixed to the first cylinder part through the first connecting member, the connecting device includes a flange, the flange is located between the first connecting member and the second connecting member, and the flange is squeezed with the second cylinder part.

[0008] Furthermore, the connecting device also includes a first connecting arm and a second connecting arm, the first connecting arm is fixed to the first cylinder part through the first connecting member, the second connecting arm is connected to the second cylinder part through the second connecting member, and the gap is located between the second cylinder part and the second connecting arm.

[0009] Furthermore, the connecting device also includes a first connecting surface and a second connecting surface, the first connecting surface is located at the first connecting arm, the second connecting surface is located at the second connecting arm, the flange is connected to the first connecting surface and the second connecting surface respectively, the flange is flush with the first connecting surface, the flange is higher than the second connecting surface, and the gap is located between the second cylinder part and the second connecting surface.

[0010] Furthermore, the flange enables the connecting device and the second connecting member to provide the second cylinder part with a force directed toward the connecting surface between the first cylinder part and the second cylinder part through a lever action.

[0011] Furthermore, the first connecting surface and the second connecting surface are both planes, and the flange extends along the intersection line of the first connecting surface and the second connecting surface.

[0012] Furthermore, an included angle between the first connecting surface and the second connecting surface is 100° to 170°.

[0013] Furthermore, the first cylinder portion includes a first groove, the second cylinder portion includes a second groove, the first groove and the second groove are both located on the first end surface formed by the first cylinder portion and the second cylinder portion, the first connecting arm is at least partially located in the first groove, and the second connecting arm is at least partially located in the second groove.

[0014] Furthermore, the bottom surface of the first groove and the bottom surface of the second groove are both planes, and the angle between the bottom surface of the first groove and the bottom surface of the second groove is 100° to 170°.

[0015] Furthermore, the bottom surface of the first groove is perpendicular to the axial direction of the gas turbine, and the normal positive direction of the bottom surface of the second groove points to the connecting surface between the first cylinder part and the second cylinder part.

[0016] Furthermore, the first connecting surface is parallel to the bottom surface of the first groove, and the second connecting surface is parallel to the bottom surface of the second groove.

[0017] Furthermore, the gap is located between the bottom surface of the first groove and the second connecting surface, and the thickness of the gap is constant.

[0018] Furthermore, the first connecting member and the second connecting member are both bolts, the axial direction of the first connecting member is perpendicular to the first connecting surface, and the axial direction of the second connecting member is perpendicular to the second connecting surface.

[0019] Furthermore, the first cylinder part also includes a first fixing hole, and the second cylinder part also includes a second fixing hole, the first fixing hole is located on the bottom surface of the first groove, and the second fixing hole is located on the bottom surface of the second groove; the connecting device also includes a first through hole and a second through hole, and the flange is located between the first through hole and the second through hole; the first connecting member connects the first through hole and the first fixing hole, and the second connecting member connects the second through hole and the second fixing hole.

[0020] Furthermore, the gas turbine further includes a gasket, and the second connecting member is connected to the second connecting arm via the gasket.

[0021] Furthermore, the gasket is a spherical tile, and the hardness of the gasket is greater than the hardness of the first cylinder part and the second cylinder part.

[0022] Furthermore, the connecting device further comprises a gasket ring groove, the gasket ring groove is located at one end of the second through hole away from the bottom surface of the second groove, and the gasket is located in the gasket ring groove.

[0023] Furthermore, the first cylinder part is a bearing box cover, the second cylinder part is the lower inner ring of the intake cylinder, the connecting surface between the first cylinder part and the second cylinder part is the center dividing surface of the intake cylinder, and the first end surface is located at the outlet end of the intake cylinder.

[0024] Furthermore, the second cylinder portion further includes a sealing groove, which is located at a connecting surface between the second cylinder portion and the first cylinder portion, and which extends along the axial direction of the gas turbine. The sealing groove is not connected to the second groove.

[0025] By applying the above technical solution of the present invention, at least the following technical effects are achieved:

[0026] 1. The gas turbine connection device proposed in the present invention achieves an "oblique pulling" effect by applying a force directed toward the connection surface to the second cylinder portion, replacing the original screw hole design that occupies radial space, thereby saving space and preventing radial interference.

[0027] 2. The gas turbine connection device proposed in the present invention has an angle between the first connection surface and the second connection surface of 100° to 170°, which is conducive to the utilization of force distribution and space.

[0028] 3. The gas turbine connection device proposed in the present invention adopts a spherical tile as the gasket, which can ensure that the second connecting part is smoothly screwed into the screw hole for assembly under the condition that the second fixing hole is off-center or there are accumulated tolerances in the processing and assembly of other parts, thereby achieving an adaptive effect.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 A schematic structural diagram of the center plane of the inner ring of the intake cylinder in the background art is presented;

[0032] Figure 2 A schematic structural diagram of a connecting device in one embodiment is shown;

[0033] Figure 3 A cross-sectional view of a connecting device in one embodiment is shown;

[0034] Figure 4 A cross-sectional view of the installation effect of a connecting device in one embodiment is shown;

[0035] Figure 5 A diagram showing the installation effect of a connecting device in one embodiment is shown;

[0036] Figure 6 A schematic structural diagram of the first cylinder portion in one embodiment is shown;

[0037] Figure 7 A schematic structural diagram of the second cylinder portion in one embodiment is shown;

[0038] Figure 8 A schematic structural diagram of a first connecting member in an embodiment is shown;

[0039] Figure 9 A schematic structural diagram of a second connecting member in one embodiment is shown;

[0040] Figure 10 A schematic structural diagram of a third connecting member in an embodiment is shown;

[0041] Figure 11 A schematic structural diagram of a gasket ring in one embodiment is shown;

[0042] Figure 12 A cross-sectional view of a gasket in one embodiment is shown;

[0043] Figure 13 A schematic diagram of the sealing strip structure in one embodiment is provided. Reference numerals: 1, first cylinder portion; 11, first groove; 12, first fixing hole; 13, first bolt hole; 2, second cylinder portion; 21, second groove; 22, second fixing hole; 23, sealing groove; 24, second bolt hole; 3, connecting device; 31, first connecting arm; 32, second connecting arm; 33, first through hole; 34, second through hole; 35, flange; 36, gasket groove; 37, first connecting surface; 38, second connecting surface; 4, gasket; 5, first end surface; 6, gap; 7, sealing strip; 101, first connecting member; 102, second connecting member; 103, third connecting member. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0045] The present invention is further described in detail below with reference to specific examples. These examples should not be construed as limiting the scope of protection claimed in the present invention.

[0046] Example

[0047] According to one aspect of the present invention, a gas turbine connecting device is proposed, wherein the gas turbine includes a first cylinder portion 1, a second cylinder portion 2 and a connecting device 3, wherein the first cylinder portion 1 and the second cylinder portion 2 are connected, and the gas turbine also includes a second connecting member 102, wherein the connecting device 3 is fixed to the first cylinder portion 1, and the connecting device 3 is connected to the second cylinder portion 2 via the second connecting member 102, and a gap 6 is provided between the connecting device 3 and the second cylinder portion 2, and the second connecting member 102 can provide the second cylinder portion 2 with a force directed toward the connecting surface between the first cylinder portion 1 and the second cylinder portion 2.

[0048] Specifically, if Figure 2-5 As shown, under the action of the force provided by the second connecting member 102 directed to the connecting surface of the first cylinder part 1 and the second cylinder part 2, the first cylinder part 1 and the second cylinder part 2 are squeezed against each other and cooperate with other structures such as the sealing strip 7 to achieve sealing.

[0049] The gas turbine further includes a first connecting member 101, through which the connecting device 3 is secured to the first cylinder portion 1. The connecting device 3 includes a flange 35, which is located between the first connecting member 101 and the second connecting member 102. The flange 35 is pressed against the second cylinder portion 2. The connecting device 3 further includes a first connecting arm 31 and a second connecting arm 32. The first connecting arm 31 is secured to the first cylinder portion 1 via the first connecting member 101, and the second connecting arm 32 is connected to the second cylinder portion 2 via the second connecting member 102. The gap 6 is located between the second cylinder portion 2 and the second connecting arm 32. The connecting device 3 also includes a first connecting surface 37 and a second connecting surface 38. The first connecting surface 37 is located on the first connecting arm 31, and the second connecting surface 38 is located on the second connecting arm 32. The flange 35 is connected to the first connecting surface 37 and the second connecting surface 38, respectively. The flange 35 is flush with the first connecting surface 37 and higher than the second connecting surface 38. The gap 6 is located between the second cylinder portion 2 and the second connecting surface 38. The flange 35 enables the connecting device 3 and the second connecting member 102 to provide a force to the second cylinder portion 2 directed toward the connecting surface between the first cylinder portion 1 and the second cylinder portion 2 through a lever action. The first connecting surface 37 and the second connecting surface 38 are both planar, and the flange 35 extends along the intersection of the first connecting surface 37 and the second connecting surface 38.

[0050] Specifically, if Figure 2-5As shown, the flange 35 is provided at the corner of the connecting device 3, preventing interference and serving as a lever fulcrum. A gap 6 is located between the lower surface of the connecting device 3 and the second cylinder portion 2, allowing the connecting device 3 and the second cylinder portion 2 to form a lever mechanism. Under the action of the second connecting member 102, the second cylinder portion 2 and the first cylinder portion 1 are pressed against each other.

[0051] The angle between the first connecting surface 37 and the second connecting surface 38 is 135°. In other embodiments, the angle between the first connecting surface 37 and the second connecting surface 38 can also be 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0052] The first cylinder portion 1 includes a first groove 11, and the second cylinder portion 2 includes a second groove 21. Both the first groove 11 and the second groove 21 are located on the first end surface 5 formed by the first and second cylinder portions 1 and 2. The first connecting arm 31 is at least partially located in the first groove 11, and the second connecting arm 32 is at least partially located in the second groove. The bottom surface of the first groove 11 is perpendicular to the axial direction of the gas turbine, and the normal direction of the bottom surface of the second groove 21 points toward the connecting surface between the first and second cylinder portions 1 and 2. The first connecting surface 37 is parallel to the bottom surface of the first groove 11, and the second connecting surface 38 is parallel to the bottom surface of the second groove 21. The gap 6 is located between the bottom surface of the first groove 11 and the second connecting surface 38, and the thickness of the gap 6 is constant.

[0053] like Figure 4-7 As shown, the width of the first groove 11 is slightly larger than that of the first connecting arm 31, and the top is arc-shaped, which facilitates slight rotation of the connecting device 3. The upper end of the connecting device 3 has an arc-shaped top, the same shape as the first groove 11, with a gap between them. The width of the second groove 21 is larger than that of the second connecting arm 32, which facilitates installation.

[0054] The bottom surface of the first groove 11 and the bottom surface of the second groove 21 are both planes, and the angle between the bottom surface of the first groove 11 and the bottom surface of the second groove 21 is 135°. Figure 5 As shown, the included angle between the bottom surface of the first groove 11 and the bottom surface of the second groove 21 is the same as the included angle between the first connecting surface 37 and the second connecting surface 38 , which facilitates the installation of the connecting device 3 .

[0055] In other embodiments, the angle between the bottom surface of the first groove 11 and the bottom surface of the second groove 21 may also be 100°, 110°, 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0056] The first cylinder part 1 further includes a first fixing hole 12, and the second cylinder part 2 further includes a second fixing hole 22. The first fixing hole 12 is located on the bottom surface of the first groove 11, and the second fixing hole 22 is located on the bottom surface of the second groove 21. The connecting device 3 further includes a first through hole 33 and a second through hole 34, and the flange 35 is located between the first through hole 33 and the second through hole 34. The first connecting member 101 connects the first through hole 33 and the first fixing hole 12, and the second connecting member 102 connects the second through hole 34 and the second fixing hole 22. The first connecting member 101 and the second connecting member 102 are both bolts. The axial direction of the first connecting member 101 is perpendicular to the first connecting surface 37, and the axial direction of the second connecting member 102 is perpendicular to the second connecting surface 38. Specifically, as Figure 4-5 and Figure 8-9 As shown, the first connecting member 101 is an external hexagon screw, and the second connecting member 102 is an internal hexagon screw. The internal hexagon screw saves space and can prevent interference during assembly, and the external hexagon screw is used for fixing and is convenient for exerting force when tightening.

[0057] The gas turbine also includes a backing ring 4, through which the second connecting member 102 is connected to the second connecting arm 32. The backing ring 4 is a spherical pad having a harder hardness than the first cylinder portion 1 and the second cylinder portion 2. The connecting device 3 also includes a backing ring groove 36, which is located at an end of the second through hole 34 away from the bottom surface of the second groove 21. The backing ring 4 is located in the backing ring groove 36.

[0058] Specifically, if Figure 4-5 and Figure 11-12 As shown, the diameter of the second through hole 34 is larger than the diameter of the second connecting member 102, but smaller than the diameter of the backing ring 4. The backing ring groove 36 is matched with the backing ring 4, and the spherical diameter of the backing ring 4 is the same as the spherical groove diameter of the backing ring groove 36. The surface of the backing ring 4 is slightly lower than the surface of the second connecting arm 32, and the inner diameter of the backing ring 4 is larger than the diameter of the second connecting member 102.

[0059] The first cylinder portion 1 is the bearing housing cover, and the second cylinder portion 2 is the lower inner ring of the intake cylinder. The connecting surface between the first cylinder portion 1 and the second cylinder portion 2 is the center dividing surface of the intake cylinder, and the first end surface 5 is located at the outlet end of the intake cylinder. The second cylinder portion 2 also includes a sealing groove 23 located at the connecting surface between the second cylinder portion 2 and the first cylinder portion 1. The sealing groove 23 extends along the axial direction of the gas turbine and is not connected to the second groove 21.

[0060] Specifically, if Figure 2-13As shown, the bearing housing cover adopts a broken flange design, that is, the flange is eliminated in the cramped space, while the flange and screw holes are retained in other places. The second cylinder portion 2 also includes multiple second bolt holes 24. The sealing groove 23 and the second bolt holes 24 are both located at the connection surface between the first cylinder portion 1 and the second cylinder portion 2. The sealing groove 23 extends along the axial direction of the gas turbine. The multiple second bolt holes 24 are arranged along the axial direction of the gas turbine and are located radially outward of the sealing groove 23. The first cylinder portion 1 also includes multiple first bolt holes 13. The first bolt holes 13 are located at the connection surface between the first cylinder portion 1 and the second cylinder portion 2 and are arranged along the axial direction of the gas turbine. The gas turbine also includes a sealing strip 7 and a third connecting member 103. The sealing strip 7 is located in the sealing groove 23. The third connecting member 103 extends through the first bolt holes 13 and the second bolt holes 24 to connect the first cylinder portion 1 and the second cylinder portion 2.

[0061] By applying the above technical solution of the present invention, at least the following technical effects are achieved:

[0062] 1. The gas turbine connection device proposed in the present invention achieves an "oblique pulling" effect by applying a force directed toward the connection surface to the second cylinder portion, replacing the original screw hole design that occupies radial space, thereby saving space and preventing radial interference.

[0063] 2. The gas turbine connection device proposed in the present invention has an angle between the first connection surface and the second connection surface of 100° to 170°, which is conducive to the utilization of force distribution and space.

[0064] 3. The gas turbine connection device proposed in the present invention adopts a spherical tile as the gasket, which can ensure that the second connecting part is smoothly screwed into the screw hole for assembly under the condition that the second fixing hole is off-center or there are accumulated tolerances in the processing and assembly of other parts, thereby achieving an adaptive effect.

[0065] The above are only a number of specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

[0066] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0067] It should be noted that, in the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

Claims

1. A gas turbine connecting device, comprising a first cylinder portion (1), a second cylinder portion (2) and a connecting device (3), wherein the first cylinder portion (1) and the second cylinder portion (2) are connected, characterized in that: The gas turbine further comprises a second connecting member (102), the connecting device (3) is fixed to the first cylinder part (1), the connecting device (3) is connected to the second cylinder part (2) via the second connecting member (102), a gap (6) exists between the connecting device (3) and the second cylinder part (2), and the second connecting member (102) can provide the second cylinder part (2) with a force directed toward the connection surface between the first cylinder part (1) and the second cylinder part (2).

2. The gas turbine connection device according to claim 1, characterized in that: The gas turbine further comprises a first connecting member (101), and the connecting device (3) is fixed to the first cylinder part (1) via the first connecting member (101). The connecting device (3) comprises a flange (35), the flange (35) is located between the first connecting member (101) and the second connecting member (102), and the flange (35) is pressed against the second cylinder part (2).

3. The gas turbine connection device according to claim 2, characterized in that: The connecting device (3) further comprises a first connecting arm (31) and a second connecting arm (32), wherein the first connecting arm (31) is fixed to the first cylinder part (1) via the first connecting member (101), and the second connecting arm (32) is connected to the second cylinder part (2) via the second connecting member (102), and the gap (6) is located between the second cylinder part (2) and the second connecting arm (32).

4. The gas turbine connection device according to claim 3, characterized in that: The connecting device (3) further comprises a first connecting surface (37) and a second connecting surface (38), wherein the first connecting surface (37) is located on the first connecting arm (31), and the second connecting surface (38) is located on the second connecting arm (32). The flange (35) is connected to the first connecting surface (37) and the second connecting surface (38) respectively. The flange (35) is flush with the first connecting surface (37) and is higher than the second connecting surface (38). The gap (6) is located between the second cylinder part (2) and the second connecting surface (38).

5. The gas turbine connection device according to claim 4, characterized in that: The flange (35) enables the connecting device (3) and the second connecting member (102) to provide the second cylinder part (2) with a force directed toward the connecting surface between the first cylinder part (1) and the second cylinder part (2) through a lever action.

6. The gas turbine connection device according to claim 5, characterized in that: The first connecting surface (37) and the second connecting surface (38) are both planes, and the flange (35) extends along the intersection line of the first connecting surface (37) and the second connecting surface (38).

7. The gas turbine connection device according to claim 6, characterized in that: The included angle between the first connecting surface (37) and the second connecting surface (38) is 100° to 170°.

8. The gas turbine connection device according to claim 7, characterized in that: The first cylinder portion (1) includes a first groove (11), and the second cylinder portion (2) includes a second groove (21). The first groove (11) and the second groove (21) are both located on a first end surface (5) formed by the first cylinder portion (1) and the second cylinder portion (2). The first connecting arm (31) is at least partially located in the first groove (11), and the second connecting arm (32) is at least partially located in the second groove.

9. The gas turbine connection device according to claim 8, characterized in that: The bottom surface of the first groove (11) and the bottom surface of the second groove (21) are both planes, and the angle between the bottom surface of the first groove (11) and the bottom surface of the second groove (21) is 100° to 170°.

10. The gas turbine connection device according to claim 9, characterized in that: The bottom surface of the first groove (11) is perpendicular to the axial direction of the gas turbine, and the normal positive direction of the bottom surface of the second groove (21) points to the connection surface between the first cylinder part (1) and the second cylinder part (2).

11. The gas turbine connection device according to claim 10, characterized in that: The first connecting surface (37) is parallel to the bottom surface of the first groove (11), and the second connecting surface (38) is parallel to the bottom surface of the second groove (21).

12. The gas turbine connection device according to claim 11, characterized in that: The gap (6) is located between the bottom surface of the first groove (11) and the second connecting surface (38), and the thickness of the gap (6) is constant.

13. The gas turbine connection device according to claim 12, characterized in that: The first connecting member (101) and the second connecting member (102) are both bolts. The axial direction of the first connecting member (101) is perpendicular to the first connecting surface (37), and the axial direction of the second connecting member (102) is perpendicular to the second connecting surface (38).

14. The gas turbine connection device according to claim 13, characterized in that: The first cylinder portion (1) further includes a first fixing hole (12), and the second cylinder portion (2) further includes a second fixing hole (22), the first fixing hole (12) being located on the bottom surface of the first groove (11), and the second fixing hole (22) being located on the bottom surface of the second groove (21); The connecting device (3) further comprises a first through hole (33) and a second through hole (34), and the flange (35) is located between the first through hole (33) and the second through hole (34); The first connecting member (101) connects the first through hole (33) and the first fixing hole (12), and the second connecting member (102) connects the second through hole (34) and the second fixing hole (22).

15. The gas turbine connection device according to claim 14, characterized in that: The gas turbine further comprises a gasket (4), and the second connecting member (102) is connected to the second connecting arm (32) via the gasket (4).

16. The gas turbine connection device according to claim 15, characterized in that: The backing ring (4) is a spherical tile, and the hardness of the backing ring (4) is greater than the hardness of the first cylinder part (1) and the second cylinder part (2).

17. The gas turbine connection device according to claim 16, characterized in that: The connecting device (3) further comprises a gasket ring groove (36), wherein the gasket ring groove (36) is located at one end of the second through hole (34) away from the bottom surface of the second groove (21), and the gasket (4) is located in the gasket ring groove (36).

18. The gas turbine connection device according to claim 17, characterized in that: The first cylinder part (1) is a bearing box cover, the second cylinder part (2) is a lower inner ring of the intake cylinder, the connecting surface between the first cylinder part (1) and the second cylinder part (2) is a center plane of the intake cylinder, and the first end surface (5) is located at the outlet end of the intake cylinder.

19. The gas turbine connection device according to claim 18, characterized in that: The second cylinder portion (2) further comprises a sealing groove (23), the sealing groove (23) being located at a connection surface between the second cylinder portion (2) and the first cylinder portion (1), the sealing groove (23) extending along the axial direction of the gas turbine, and the sealing groove (23) being not connected to the second groove (21).

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