Adjustable stationary blade rotating shaft sealing device of gas turbine

Abstract

The invention relates to the technical field of gas turbines, in particular to a gas turbine adjustable stationary blade rotating shaft sealing device which comprises a gas turbine and a sealing mechanism, and the gas turbine comprises a cylinder body, a hub, adjustable stationary blades and movable blades; the adjustable stationary blade is rotationally arranged with the cylinder body and / or the hub through the rotating shaft; mounting holes are formed in the cylinder body and the hub; the sealing mechanism is mounted in a gap between the rotating shaft and the mounting hole and comprises a front plate, a back plate and brush wires which are arranged on the rotating shaft. Based on the mounting positions of the front plate, the back plate and the brush wires, the brush wires can be tightly attached to a leakage part, when the rotating shaft jumps or moves, the brush wires can be withdrawn in time to reduce abrasion or fill leakage gaps in time, flow loss caused by gas leakage from the gaps of the rotating shaft is avoided, meanwhile, the phenomenon that a flow field is unstable due to leakage flow is avoided, and the service life of the rotating shaft is prolonged. The structure is simple, machining and assembling are convenient, impurities can be prevented from entering gaps to cause rotation failure, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbines, in particular to a gas turbine adjustable stationary blade shaft sealing device. Background Art

[0002] In order to improve the performance of the gas turbine at partial load (not full load), an adjustable stator structure is usually used in the first few stages of the compressor. The adjustable stator structure can improve the flow separation phenomenon, prevent compressor surge, and improve the stability and compressor efficiency at partial load.

[0003] However, due to the inevitable gap between the rotor shaft of the stationary blade and the stationary end wall, it will also cause a certain loss in gas turbine efficiency.

[0004] Based on the existing technical characteristics, it is hoped that while broadening the partial load performance of the gas turbine, the losses caused by leakage in the adjustable stator shaft clearance can be reduced, and the problem of large leakage in the current traditional labyrinth seal form can be solved. Summary of the invention

[0005] The present invention is proposed in view of the above-mentioned flow loss problem at the stator blade end or in the prior art.

[0006] Therefore, an object of the present invention is to provide a gas turbine adjustable stator shaft sealing device.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: comprising a gas turbine and a sealing mechanism, wherein the gas turbine comprises a cylinder body, a hub, adjustable stationary blades and moving blades;

[0008] The adjustable stationary blade is rotatably connected to the cylinder body and / or the wheel hub via a rotating shaft;

[0009] The cylinder body and the wheel hub are both provided with mounting holes;

[0010] The sealing mechanism is installed at the gap between the rotating shaft and the mounting hole, and comprises:

[0011] A front plate and a back plate, arranged on the rotating shaft;

[0012] Brush wires are arranged between the front plate and the back plate.

[0013] As a preferred solution of the gas turbine adjustable stator shaft sealing device of the present invention, wherein: the mounting hole is adapted to the hub.

[0014] As a preferred solution of the gas turbine adjustable stator blade shaft sealing device of the present invention, the adjustable stator blades are located on the outer side wall of the hub and are evenly distributed in a circumferential array.

[0015] As a preferred solution of the gas turbine adjustable stator shaft sealing device of the present invention, the brush wire is fixedly connected to the outer side wall of the shaft.

[0016] As a preferred solution of the gas turbine adjustable stator blade shaft sealing device of the present invention, wherein: the number of the mounting holes corresponds to the setting of the shaft.

[0017] As a preferred solution of the gas turbine adjustable stator blade shaft sealing device of the present invention, the adjustable stator blades are radially distributed around the axis of the hub.

[0018] As a preferred solution of the gas turbine adjustable stator blade shaft sealing device of the present invention, the front plate is located on the side of the outer side of the shaft close to the adjustable stator blade, and the back plate is located on the side of the outer side of the shaft away from the adjustable stator blade.

[0019] As a preferred solution of the gas turbine adjustable stator shaft sealing device of the present invention, there is an angle between the extension direction of the front plate, the back plate, and the brush wire and the axial direction of the shaft, and the angle is 30°-50°.

[0020] As a preferred solution of the gas turbine adjustable stator shaft sealing device of the present invention, wherein: the sealing mechanism is located between the shaft and the mounting hole and is provided as at least one.

[0021] As a preferred solution of the gas turbine adjustable stator shaft sealing device of the present invention, a wear-resistant coating is provided in the mounting hole.

[0022] The beneficial effects of the gas turbine adjustable stator blade shaft sealing device of the present invention are as follows:

[0023] Based on the installation positions of the front plate, the back plate and the brush wires, the present invention can closely fit the leakage parts. When the rotating shaft jumps or moves, the brush wires can retreat in time to reduce wear, or fill the leakage gap in time to avoid gas leakage from the rotating shaft gap to cause flow loss, and at the same time avoid the flow field instability caused by the leakage flow.

[0024] The invention has a simple structure, is easy to process and assemble, can prevent impurities from entering the gap to cause rotation failure, and prolongs the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the structure of the gas turbine inlet end and adjustable stator blades.

[0027] Figure 2 It is a side view of the gas turbine inlet end and the adjustable stator and rotor blades.

[0028] Figure 3 The first structural schematic diagram of the gas turbine adjustable stator shaft sealing device (the above Figure 2 Internal structure view of "A" in Figure 1).

[0029] Figure 4 A cross-sectional view of a gas turbine adjustable stator shaft sealing device (the above Figure 2 Partial cross-sectional view of "A" in FIG.

[0030] Figure 5 The second structural schematic diagram of the gas turbine adjustable stator shaft sealing device.

[0031] Figure 6 The present invention is a schematic diagram of the brush wire structure included in the gas turbine adjustable stator shaft sealing device. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] Please refer to Figures 1 to 4 As a first embodiment of the present invention, this embodiment provides a gas turbine adjustable stator shaft sealing device, which includes a gas turbine 100 and a sealing mechanism 200;

[0036] The gas turbine 100 includes:

[0037] Cylinder body 101 is used as the housing of the air intake end;

[0038] The hub 104 is installed inside the cylinder body 101 and used as a fixing part;

[0039] The rotor (not shown in the figure, in actual use, is located inside the cylinder 101 and on one side of the hub 104), is rotatably installed inside the cylinder 101 and used as a transmission member;

[0040] The adjustable stationary blade 102 is rotatably mounted on the outer wall of the hub 104 and is located between the hub 104 and the cylinder body 101;

[0041] Specifically, the adjustable stationary blades 102 are located on the outer wall of the hub 104 and are distributed in a circumferentially uniform array;

[0042] The moving blade 103 is fixedly mounted on the outer wall of the rotor and is used as an intake blade;

[0043] In the use state, the rotor with the moving blades 103 installed rotates, driving the moving blades 103 to make circular motion, thereby realizing the air intake work between the cylinder body 101 and the hub 104;

[0044] The mounting hole 102b is embedded in the outer wall of the cylinder body 101 and the inner wall of the wheel hub 104;

[0045] Specifically, a wear-resistant coating is sprayed inside the mounting hole 102b;

[0046] More specifically, the material of the wear-resistant coating is a chromium-based alloy, a tungsten-based alloy, Al2O3 ceramic or ZrO2;

[0047] The number of adjustable stationary blades 102 is several and evenly distributed on the outer wall of the hub 104. The adjustable stationary blades 102, the hub 104 and the cylinder body 101 are rotatably mounted via the rotating shaft 102a. The number of the rotating shaft 102a and the mounting holes 102b matches the number of the adjustable stationary blades 102.

[0048] More specifically, the rotation direction of the stationary blade 102 around the rotating shaft 102a is adjustable, that is, the axis of the rotating shaft 102a points to the axis of the hub 104, and the rotation axes of the plurality of rotating shafts 102a are radially distributed around the axis of the hub 104;

[0049] When in use, the rotor on which the moving blades 103 are installed rotates at a constant speed, driving the moving blades 103 to move, thereby realizing the air intake operation. When the air intake volume needs to be adjusted, the user can adjust it in the following two ways:

[0050] First, the output of the power source driving the rotor to rotate is changed, the speed of the rotor is changed, and thus the movement speed of the moving blades 103 is changed to adjust the intake air volume;

[0051] Second, the angle of the adjustable stator blade 102 is changed, that is, the angle of the adjustable stator blade 102 compared to the vertical cross section of the hub 104, and the angle adjustment range is 1° to 89°. When the angle between the adjustable stator blade 102 and the cross section of the hub 104 is 1°, the air intake is the smallest, and when the angle between the adjustable stator blade 102 and the cross section of the hub 104 is 89°, the air intake is the largest.

[0052] In summary, the air intake amount of the gas turbine 100 can be adjusted;

[0053] The sealing mechanism 200 is installed at both ends of the adjustable stator blades included in the gas turbine 100, that is, the gap between the adjustable stator blade 102 and the cylinder body 101 or the gap between the adjustable stator blade 102 and the hub 104, and includes:

[0054] The front plate 201 and the back plate 202 are arranged on the outer side wall of the rotating shaft 102a;

[0055] Specifically, the front plate 201 is located on a side close to the adjustable stationary blade 102, and the back plate 202 is located on a side close to the cylinder body 101 and the hub 104;

[0056] Furthermore, the front plate 201 and the back plate 202 are both configured as annular plates, fixed to the outer side wall of the rotating shaft 102a;

[0057] Brush filaments 203 are arranged between the front plate 201 and the back plate 202;

[0058] Specifically, the brush filaments 203 are distributed in a linear array between the front plate 201 and the back plate 202, and are distributed in a circular array outside the rotating shaft 102a;

[0059] More specifically, the brush wire 203 is welded to the outer side wall of the rotating shaft 102a;

[0060] The sealing mechanism 200 is located between the rotating shaft 102a and the mounting hole 102b and is provided in multiple groups. The specific number of groups is determined according to the contact surface between the mounting hole 102b and the rotating shaft 102a and the sealing requirements under specific working conditions.

[0061] During use, based on the brush seal form, the gap leakage of the rotating shaft 102a of the adjustable stator blade 102 is reduced, the leakage loss is reduced, thereby reducing the flow loss at the end of the adjustable stator blade 102, and improving the efficiency and stability of the compressor.

[0062] Please refer to Figure 5-Figure 6 As another embodiment of the present invention, a method for using the above-mentioned gas turbine adjustable stator blade shaft sealing device in actual use conditions is provided, comprising the gas turbine adjustable stator blade shaft sealing device in the above-mentioned embodiment, and the following steps:

[0063] Step 1: Install multiple sets of sealing mechanisms 200 into the installation holes 102b;

[0064] The front plate 201 of the sealing mechanism 200 is installed at a side of the outer wall of the rotating shaft 102a close to the adjustable stationary blade 102, and the back plate 202 is installed at a side of the outer wall of the rotating shaft 102a away from the adjustable stationary blade 102;

[0065] The gap between the multiple sets of sealing mechanisms 200 is h, and the value range of h is 0.5mm-2mm. In this embodiment, the value of h is 0.8mm;

[0066] The gap between the rotating shaft 102a and the mounting hole 102b is r. In this embodiment, the value of r is 3 mm.

[0067] The protection height of the front plate 201 is k1, and the value range of k1 is 0.2r-0.6r. In this embodiment, the value of k1 is 1.5mm;

[0068] The protection height of the back plate 202 is k2. The value range of k2 is 0.6r-1r. In this embodiment, the value of k2 is 2.8mm;

[0069] The thickness of the front plate 201 and the back plate 202 is b, and the value range of b is 0.6 mm-1.2 mm. In this embodiment, the value of b is 0.8 mm;

[0070] Step 2: welding the brush wire 203 into the mounting hole 102b;

[0071] Wherein: the welding position of the brush wire 203 is between the front plate 201 and the back plate 202;

[0072] The length of the brush filament 203 is k0, and the value range of k0 is 0.75r-1.2r. In this embodiment, the value of k0 is 3.3mm;

[0073] The diameter of the brush filament 203 is d, and the value range of d is 0.05 mm-0.08 mm. In this embodiment, the value of d is 0.06 mm;

[0074] The gap between any two brush filaments 203 is δ, and the value range of δ is 0.1d-0.2d. In this embodiment, the value of δ is 0.01mm;

[0075] Each set of sealing mechanisms 200 includes brush wires 203, and the number of rows along the axis of the rotating shaft 102a is n, and the value of n ranges from 10 to 20. In this embodiment, the value of n is 15;

[0076] There is an angle α between the extension direction of the front plate 201, the back plate 202, and the brush wire 203 and the axial direction of the rotating shaft 102a, and the value range of α is 30°-50°. In this embodiment, the value of α is 45°;

[0077] Based on the above steps and the value restrictions in the steps, the leakage of the gap between the adjustable stator blade 102 and the rotating shaft 102a can be reduced. Compared with the traditional labyrinth seal, the leakage can be reduced to 1 / 5-1 / 10, which can prevent the leakage of the working medium and save energy.

[0078] Compared with the prior art, the present invention has the following characteristics:

[0079] Based on the installation positions of the front plate 201, the back plate 202 and the brush 203, they can fit closely to the leaking parts. When the rotating shaft 102a jumps or moves, the brush 203 can retreat in time to reduce wear, or fill the leakage gap in time to avoid gas leakage from the gap of the rotating shaft 102a causing flow loss, and at the same time avoid the flow field instability caused by the leakage flow.

[0080] The invention has a simple structure, is easy to process and assemble, can prevent impurities from entering the gap to cause rotation failure, and prolongs the service life of the equipment.

[0081] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0082] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0083] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0084] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A gas turbine adjustable stator shaft sealing device, characterized in that: The invention comprises a gas turbine (100) and a sealing mechanism (200), wherein the gas turbine (100) comprises a cylinder block (101), a hub (104), adjustable stationary blades (102) and moving blades (103); The adjustable stationary blade (102) is rotatably connected to the cylinder body (101) and / or the wheel hub (104) via a rotating shaft (102a); The cylinder body (101) and the wheel hub (104) are both provided with mounting holes (102b); The sealing mechanism (200) is installed at the gap between the rotating shaft (102a) and the mounting hole (102b), and comprises: A front plate (201) and a back plate (202) are arranged on the rotating shaft (102a); The brush wire (203) is arranged between the front plate (201) and the back plate (202).

2. The gas turbine adjustable stator shaft sealing device according to claim 1, characterized in that: The mounting hole (102b) is adapted to the rotating shaft (102a).

3. The gas turbine adjustable stator shaft sealing device according to claim 2, characterized in that: The adjustable stationary blades (102) are located on the outer side wall of the hub (104) and are evenly distributed in a circumferential array.

4. The gas turbine adjustable stator shaft sealing device according to claim 1, characterized in that: The brush filaments (203) are fixedly connected to the outer side wall of the rotating shaft (102a).

5. The gas turbine adjustable stator shaft sealing device according to claim 3, characterized in that: The number of the mounting holes (102b) is arranged corresponding to the rotating shaft (102a).

6. The gas turbine adjustable stator shaft sealing device according to claim 3, characterized in that: The adjustable stationary blades (102) are distributed radially around the axis of the hub (104).

7. The gas turbine adjustable stator shaft sealing device according to claim 1, characterized in that: The front plate (201) is located on a side of the outer side of the rotating shaft (102a) close to the adjustable stationary blade (102), and the back plate (202) is located on a side of the outer side of the rotating shaft (102a) away from the adjustable stationary blade (102).

8. The gas turbine adjustable stator shaft sealing device according to claim 1, characterized in that: An included angle exists between the extension directions of the front plate (201), the back plate (202) and the brush filaments (203) and the axial direction of the rotating shaft (102a), and the included angle is 30°-50°.

9. The gas turbine adjustable stator shaft sealing device according to claim 1, characterized in that: The sealing mechanism (200) is located between the rotating shaft (102a) and the mounting hole (102b) and is provided as at least one.

10. The gas turbine adjustable stator shaft sealing device according to claim 1, characterized in that: A wear-resistant coating is provided in the mounting hole (102b).

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