Drum shaft damping structure and design method thereof

Abstract

The invention discloses a drum shaft damping structure and a design method thereof, and relates to the technical field of gas turbines. The drum shaft damping structure comprises a drum shaft, and a vibration reduction damping sleeve is movably connected into the drum shaft in a sleeved mode. A limiting structure is arranged between the vibration reduction damping sleeve and the drum shaft, and the limiting structure is used for limiting the vibration reduction damping sleeve and the drum shaft to generate relative displacement in the first direction; the first direction is parallel to the axis of the drum shaft. The drum shaft damping structure is simple in design, easy to machine, convenient to assemble and disassemble and capable of meeting the requirement for multiple times of assembly and disassembly, vibration of the drum shaft can be remarkably reduced under the combined action of structural damping and dry friction damping, and the working reliability of the drum shaft is improved. Compared with the prior art, the use cost is lower, and the sustainability is better.

Description

Technical Field

[0001] The present application relates to the technical field of gas turbines, and in particular to a drum shaft damping structure and a design method thereof. Background Art

[0002] In a gas turbine, the drum shaft is used to connect the high-pressure turbine and the high-pressure compressor, and is the main component for transmitting the torque of the gas turbine. The working conditions of the drum shaft are relatively harsh, and it bears extremely complex external loads, that is, the vibration characteristics of the drum shaft itself are extremely complex. In a light gas turbine, the drum shaft is Figure 1 As shown in (a), (b) or (c), it is a short, thick, thin-walled cylindrical shell type, that is, the mass of the drum shaft in the light gas turbine is relatively light. If the mass of the drum shaft is relatively light, the drum shaft is very likely to resonate under complex external loads. If the drum shaft resonates, it is easy to cause failures in the connection between the high-pressure turbine and the high-pressure compressor. Therefore, it is necessary to suppress or reduce the vibration of the drum shaft during use. In the prior art, viscoelastic materials are usually applied (surface treated) or embedded in the thin shell structure of the drum shaft, and the high internal damping of the viscoelastic material is used to achieve vibration reduction of the drum shaft. For example, a similar vibration reduction method is disclosed in the patent application document with patent application number CN202310643381.4. However, the damping performance of the coating is greatly affected by temperature, and it is easy to fall off during use, which does not meet the long-term operation requirements of the gas turbine, and the high-temperature resistant coating material has high cost and a long development cycle. Summary of the invention

[0003] The purpose of the present application is to provide a drum shaft damping structure and a design method thereof, so as to solve the technical problems of high cost and poor sustainability of the shock absorbing methods in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] In the first aspect, the present application proposes a technical solution for a drum shaft damping structure, which includes a drum shaft, and an internal movable sleeve of the drum shaft is connected with a vibration-damping damping sleeve; a limiting structure is arranged between the vibration-damping damping sleeve and the drum shaft, and the limiting structure is used to limit the relative displacement of the vibration-damping damping sleeve and the drum shaft along a first direction; the first direction is parallel to the centerline of the drum shaft.

[0006] As a specific solution in the technical solution of this application, the limiting structure includes:

[0007] A limiting ring disposed on the inner side of the drum shaft;

[0008] A limiting groove is arranged on the outer side surface of the vibration reduction and damping sleeve; the limiting groove is adapted to the limiting ring.

[0009] As a specific solution in the technical solution of the present application, the vibration-reducing damping sleeve is provided with an opening.

[0010] As a specific solution in the technical solution of the present application, the vibration-damping damping sleeve is provided with a plurality of holes, each of which is used for reducing the weight of the vibration-damping damping sleeve.

[0011] In a second aspect, the present application proposes a design method for a drum shaft damping structure, the method comprising:

[0012] S100: Acquire the structure and size parameters of the drum shaft;

[0013] S200: Based on the structure of the drum shaft, obtain the structure of the vibration damping sleeve;

[0014] S300: Acquire size parameters of the vibration damping sleeve based on size parameters of the drum shaft;

[0015] S400: Obtaining a vibration-damping damping sleeve based on the structure and size parameters of the vibration-damping damping sleeve.

[0016] As a specific solution in the technical solution of the present application, the size parameters of the drum shaft include the length, inner diameter, mounting edge thickness and thickness of the drum shaft; the size parameters of the vibration damping sleeve include the length and outer diameter of the vibration damping sleeve; the S300, based on the size parameters of the drum shaft, obtaining the size parameters of the vibration damping sleeve includes:

[0017] S310: Obtaining the length of the vibration damping sleeve based on the length, the thickness of the installation edge and the thickness of the drum shaft;

[0018] S320: Based on the inner diameter of the drum shaft, obtain the outer diameter of the vibration-damping sleeve.

[0019] As a specific solution in the technical solution of the present application, the size parameters of the drum shaft also include the height and width of the limiting ring; the size parameters of the vibration damping sleeve also include the depth and width of the limiting groove; the S300, based on the size parameters of the drum shaft, obtaining the size parameters of the vibration damping sleeve also includes:

[0020] S330: Acquire the depth of the limiting groove based on the height of the limiting ring;

[0021] S340: Based on the width of the limiting ring, obtain the width of the limiting groove.

[0022] As a specific solution in the technical solution of the present application, the size parameters of the vibration damping sleeve also include the width of the opening; the step S300, based on the size parameters of the drum shaft, obtaining the size parameters of the vibration damping sleeve also includes:

[0023] The width of the opening is obtained based on the height of the limiting ring and the inner diameter of the drum shaft.

[0024] As a specific solution in the technical solution of the present application, after obtaining the vibration damping sleeve based on the structure and size parameters of the vibration damping sleeve in S400, the method further includes:

[0025] S500: obtaining a vibration reduction evaluation result based on the vibration reduction damping sleeve;

[0026] S600: If the vibration reduction evaluation result is qualified, the design is terminated; if the vibration reduction evaluation result is unqualified, the process returns to step S300.

[0027] Compared with the prior art, the beneficial effects of this application are:

[0028] The drum shaft damping structure proposed in this application is simple in design, easy to process, and convenient to assemble and disassemble, and can meet the needs of multiple assembly and disassembly. Under the combined effect of structural damping and dry friction damping, the vibration of the drum shaft can be significantly reduced, and the working reliability of the drum shaft can be improved. Compared with the existing technology, its use cost is lower and its sustainability is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a cross-sectional view of three types of drum shafts in the prior art;

[0030] Figure 2 A three-dimensional diagram of a drum shaft damping structure proposed in an embodiment of the present application;

[0031] Figure 3 for Figure 2 A cross-sectional view of

[0032] Figure 4 for Figure 3 An enlarged view of part B;

[0033] Figure 5 A three-dimensional diagram of a vibration-reducing damping sleeve proposed in an embodiment of the present application;

[0034] Figure 6 for Figure 5 A plan view of

[0035] Figure 7 This is a flow chart of a design method for a drum shaft damping structure proposed in an embodiment of the present application.

[0036] In the figure: 1, drum shaft; 11, limiting ring; 2, vibration damping sleeve; 21, limiting groove; 22, opening. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In order to solve the technical problems in the background technology, the present application proposes a drum shaft damping structure, which includes a drum shaft 1 and a vibration damping sleeve 2, wherein the vibration damping sleeve 2 is movably sleeved inside the drum shaft 1, and when the drum shaft 1 rotates at a high speed, the outer wall of the vibration damping sleeve 2 fits with the inner wall of the drum shaft 1. It should be clear that in the embodiments of the present application, Figure 2 and Figure 3 As shown, a vibration-damping sleeve 2 is arranged inside the drum shaft 1. Since the vibration-damping sleeve 2 is sleeved inside the drum shaft 1 and the outer wall of the vibration-damping sleeve 2 fits with the inner wall of the drum shaft 1 during the operation of the drum shaft 1, the vibration-damping sleeve 2 can absorb the vibration generated by the drum shaft 1 and play a role in vibration reduction.

[0042] In order to ensure that the outer wall of the vibration-damping sleeve 2 always fits tightly with the inner wall of the drum shaft 1 during the operation of the drum shaft 1 to achieve a vibration-damping effect, a limiting structure is provided between the vibration-damping sleeve 2 and the drum shaft 1, and the limiting structure is used to limit the relative displacement of the vibration-damping sleeve 2 and the drum shaft 1 along a first direction; the first direction is parallel to the axis of the drum shaft 1. It should be clear that, by providing the limiting structure, it can be ensured that the vibration-damping sleeve 2 and the drum shaft 1 do not produce relative displacement along the first direction, that is, the outer wall of the vibration-damping sleeve 2 can always fit tightly with the inner wall of the drum shaft 1 during the operation of the drum shaft 1.

[0043] In an embodiment of the present application, the limiting structure may be any structure capable of limiting the relative position of the vibration damping sleeve and the drum shaft along the first direction. Figure 4 As shown, the limiting structure may include a limiting ring 11 disposed on the inner side of the drum shaft 1 and a limiting groove 21 disposed on the outer side of the vibration damping sleeve 2. It is easy to understand that in another embodiment of the present application, the limiting groove 21 may be disposed on the inner side of the drum shaft 1, and the limiting ring 11 is disposed on the outer side of the vibration damping sleeve 2. In the embodiment of the present application, the limiting groove 21 is adapted to the limiting ring 11.

[0044] It should be clear that the matching of the limiting groove 21 and the limiting ring 11 means that the limiting ring 11 will not move along the first direction when it is inserted into the limiting groove 21. In other words, the limiting ring 11 can form an interference fit with the limiting groove 21, that is, the outer side surface of the limiting ring 11 and the inner side surface of the limiting groove 21 form a large resistance force; or the limiting ring 11 can form a clearance fit with the limiting groove 21, that is, the outer side surface of the limiting ring 11 and the inner side surface of the limiting groove 21 do not form a resistance force or form a small resistance force.

[0045] It should be clear that in the embodiments of the present application, Figure 4 As shown, if the limit ring 11 is provided on the drum shaft 1, the limit ring 11 can not only stop the vibration damping sleeve 2, but also support the thin drum shaft 1, increase the strength of the drum shaft 1, and further reduce vibration. It should be clear that in the embodiment of the present application, in order to enhance the strength of the drum shaft 1 to reduce the vibration of the drum shaft 1, a plurality of limit rings 11 can be provided.

[0046] It should be clear that in the embodiments of the present application, there is no restriction on the material of the vibration damping sleeve 2. In one embodiment of the present application, the vibration damping sleeve 2 can be made of a material with good elasticity, such as an elastic alloy of model 3J21, or an elastic alloy of model GH4169, etc.; in another embodiment of the present application, the vibration damping sleeve 2 can also be made of a material with poor elasticity, such as an alloy of model 1 N706, or an alloy of model 1 N718, etc.

[0047] It is easy to understand that if the elasticity of the vibration-damping sleeve 2 is better, the damping effect is better, that is, the vibration-damping effect on the drum shaft 1 is better. In order to enhance the elasticity of the vibration-damping sleeve 2, in one embodiment of the present application, the vibration-damping sleeve 2 is provided with an opening 22. It should be clear that the vibration-damping sleeve 2 provided with the opening 22 can be contracted along the radial direction of the vibration-damping sleeve 2, thereby improving the elasticity of the vibration-damping sleeve 2, that is, the damping effect of the vibration-damping sleeve 2 can be enhanced. Since the vibration-damping sleeve 2 is provided with the opening 22, during the operation of the drum shaft 1, the vibration-damping sleeve 2 can also fit closely with the drum shaft 1 with the help of centrifugal force, thereby further enhancing the damping effect.

[0048] It should be clear that, since the vibration damping sleeve 2 is provided with an opening 22, the outer diameter of the vibration damping sleeve 2 can be reduced when the vibration damping sleeve 2 is assembled inside the drum shaft 1, so that the vibration damping sleeve 2 and the drum shaft 1 can be assembled smoothly, and the damage to the vibration damping sleeve 2 and / or the drum shaft 1 caused by the engagement of the limiting ring 11 and the limiting groove 21 can be reduced. In this embodiment, the vibration damping sleeve is an annular thin-walled part with an opening in the circumferential direction. The limiting ring and the limiting groove designed between the drum shaft and the vibration damping sleeve cooperate with each other, so that the outer wall of the vibration damping sleeve and the inner wall of the drum shaft can always fit together during use, so as to absorb the vibration of the drum shaft and play a role in vibration reduction.

[0049] It should be clear that if Figure 2 and Figure 3As shown, when assembling the vibration damping sleeve 2 in this embodiment, the vibration damping sleeve 2 is first compressed along the radial direction of the vibration damping sleeve 2, so that the outer diameter of the vibration damping sleeve 2 is smaller than the inner diameter of the drum shaft 1. Further, the vibration damping sleeve 2 with a reduced outer diameter is sent into the interior of the drum shaft 1 along the axial direction of the drum shaft 1, and the limiting ring 11 and the limiting groove 21 are aligned. Further, the radial compression force of the vibration damping sleeve 2 is canceled, and the vibration damping sleeve 2 is reset under the action of its own elastic force, and the limiting ring 11 and the limiting groove 21 form a clamping connection. When the drum shaft 1 is working, due to the action of centrifugal force, the vibration damping sleeve 2 is in closer contact with the drum shaft 1, and the vibration damping sleeve 2 and the drum shaft 1 are not an integrated structure, that is, there is a gap between the vibration damping sleeve 2 and the drum shaft 1, so under the action of airflow excitation, the vibration damping sleeve 2 and the drum shaft 1 will undergo circumferential friction movement. Through the mutual friction between the vibration-damping sleeve 2 and the drum shaft 1, part of the vibration energy of the drum shaft 1 is dissipated, and the vibration reduction effect can also be achieved.

[0050] The drum shaft damping structure proposed in the embodiment of the present application is simple in design, easy to process, and convenient to assemble and disassemble, and can meet the needs of multiple assembly and disassembly. Under the combined effect of structural damping and dry friction damping, the vibration of the drum shaft can be significantly reduced, and the working reliability of the drum shaft can be improved. Compared with the existing technology, its use cost is lower and its sustainability is better.

[0051] After introducing all the embodiments of the drum shaft damping structure proposed in the present application, the following introduces an embodiment of a design method of a drum shaft damping structure proposed in the present application, which includes steps S100 to S400:

[0052] Step S100: Obtain the structural and dimensional parameters of the drum shaft.

[0053] It should be clear that in the embodiments of the present application, Figure 3 As shown, it is necessary to reduce the vibration of the drum shaft 1 by the elasticity of the vibration-damping sleeve 2 itself, and also to reduce the vibration of the drum shaft 1 by the dry friction between the vibration-damping sleeve 2 and the drum shaft 1. In other words, during use, it is necessary to ensure that the outer wall of the vibration-damping sleeve 2 and the inner wall of the drum shaft 1 are in close contact.

[0054] It should be noted that the drum shafts of different types of gas turbines have different structures. Figure 1 As shown, Figure 1 Three common drum shafts used in light gas turbines in the prior art are listed, which are: Figure 1The cylindrical drum shaft shown in (a), the conical drum shaft shown in (b), and the composite drum shaft shown in (c). It is easy to understand that if you want to ensure that the outer wall of the vibration-damping sleeve 2 and the inner wall of the drum shaft 1 can fit tightly, you need to design the structure of the vibration-damping sleeve 2 based on the structure of the drum shaft 1.

[0055] In the embodiment of the present application, the dimension parameters of the drum shaft can be any parameters related to the design of the vibration damping sleeve. For example, the dimension parameters of the drum shaft can be as follows: Figure 3 The length L of the drum shaft and the inner diameter D of the drum shaft are shown.

[0056] Step S200: Based on the structure of the drum shaft, the structure of the vibration damping sleeve is obtained.

[0057] It should be clear that in the embodiments of the present application, the structure of the drum shaft needs to correspond to the structure of the vibration damping sleeve. That is to say, if the structure of the drum shaft is determined, the structure of the vibration damping sleeve can be directly obtained based on the structure of the drum shaft. For example, if the drum shaft is cylindrical, the vibration damping sleeve is also cylindrical; if the drum shaft is conical, the vibration damping sleeve is also conical; if Figure 3 and Figure 4 As shown in the figure, if the drum shaft is a composite type, then Figures 3 to 6 The vibration damping sleeve shown is a corresponding composite shape, and the composite vibration damping sleeve is composed of a cylindrical horizontal section and a conical conical section. In the embodiments of the present application, in order to avoid redundancy, the methods for obtaining corresponding vibration damping sleeves for different types of drum shaft designs are not listed one by one, but exemplarily in the embodiments of the present application, the following are listed: Figures 3 to 6 As shown, the design method of the present application is described by taking the design of a composite drum shaft to obtain a corresponding composite vibration damping sleeve as an example. In other words, the design method in the present application is also applicable to the design of vibration damping sleeves of other types of drum shafts such as cylindrical drum shafts and conical drum shafts, and will not be described in detail later.

[0058] Step S300: Based on the size parameters of the drum shaft, the size parameters of the vibration damping sleeve are obtained.

[0059] It should be clear that in the embodiments of the present application, at least the length, outer diameter and thickness of the vibration damping sleeve need to be known in order to design a complete vibration damping sleeve. In other words, in the embodiments of the present application, the size parameters of the vibration damping sleeve at least include the length, outer diameter and thickness of the vibration damping sleeve.

[0060] In the embodiments of the present application, Figure 3As shown, the size parameters of the drum shaft 1 at least include the length L of the drum shaft 1, the inner diameter D of the drum shaft 1, the thickness n and the thickness m of the mounting edge of the drum shaft 1. In this embodiment, step S300 obtains the size parameters of the vibration damping sleeve based on the size parameters of the drum shaft, including steps S310 and S320:

[0061] Step S310: based on the length L of the drum shaft 1 , the thickness n and the thickness m of the mounting edge, the length of the vibration damping sleeve 2 is obtained.

[0062] Specifically, in an embodiment of the present application, the length of the vibration damping sleeve may be η*(length L-thickness n-thickness m), where η is the damping coverage ratio. The inventors have found through extensive research that if the damping coverage ratio is too large, the overall weight of the drum shaft 1 will be heavier; if the damping coverage ratio is too small, the vibration reduction effect will not be achieved. In order to avoid the drum shaft 1 being too heavy and to have a good vibration reduction effect, in an embodiment of the present application, the damping coverage ratio may be greater than or equal to 0.3 and less than or equal to 0.8.

[0063] Step S320: based on the inner diameter D of the drum shaft 1, the outer diameter of the vibration damping sleeve 2 is obtained.

[0064] Specifically, in the embodiment of the present application, the outer diameter of the vibration damping sleeve can be the inner diameter D-first preset gap, and the first preset gap is the expected gap value between the vibration damping sleeve and the drum shaft, which can be an empirical value or a fixed value. For example, the first preset gap can be any gap value between greater than 0 mm and less than or equal to 2 mm. Specifically, the first preset gap can be any gap value among 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm and 2.0 mm, or any gap value between two adjacent gap values ​​mentioned above.

[0065] It should be clear that in the embodiments of the present application, the thickness of the vibration damping sleeve can be an empirical value or a fixed value. For example, the thickness of the vibration damping sleeve can be greater than or equal to 1 mm and less than or equal to 20 mm. Specifically, the thickness of the vibration damping sleeve can be any one of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm and 20 mm, or any thickness between the above two adjacent thicknesses. It should be noted that after a lot of research, the inventor found that the thickness of the vibration damping sleeve 2 is not the thicker the better. Although the thicker the vibration damping sleeve 2, the more obvious its vibration damping effect, if the thickness of the vibration damping sleeve 2 is thicker, the force on the drum shaft 1 will also increase. Because the vibration damping sleeve 2 has an opening 22, the opening 22 will increase the imbalance of the drum shaft 1, which is not conducive to reducing the vibration of the drum shaft 1. In an embodiment of the present application, the thickness of the vibration-absorbing and damping sleeve 2 may be 1 / 5 to 1 / 3 of the thickness of the drum shaft 1 .

[0066] It should be clear that the thicker the vibration damping sleeve is, the longer the life of the vibration damping sleeve is and the better the damping effect is. In order to increase the thickness of the vibration damping sleeve without increasing the weight of the vibration damping sleeve, in one embodiment of the present application, as many holes as possible (not shown in the figure) can be opened on the thicker vibration damping sleeve without affecting the strength of the vibration damping sleeve, so as to reduce the weight of the vibration damping sleeve and enhance the vibration damping effect of the vibration damping sleeve.

[0067] In one embodiment of the present application, if the drum shaft 1 is as follows Figure 3 The composite drum shaft shown in FIG. Figure 3 As shown, the dimension parameters of the drum shaft also include the taper angle A of the drum shaft 1. It is easy to understand that since the structure of the vibration damping sleeve corresponds to the structure of the drum shaft, the taper angle of the vibration damping sleeve in this embodiment is also angle A, which will not be described in detail here.

[0068] In one embodiment of the present application, if a limiting ring and a limiting groove are provided between the drum shaft and the vibration damping sleeve, the size parameters of the drum shaft also include: Figure 4 The limiting ring 11 shown has a height H and a width S; the dimension parameters of the vibration damping sleeve also include the depth and width of the limiting groove 21 .

[0069] In this embodiment, step S300, based on the size parameters of the drum shaft, obtains the size parameters of the vibration damping sleeve and further includes steps S330 and S340:

[0070] Step S330 : based on the height H of the limiting ring 11 , the depth of the limiting groove 21 is obtained.

[0071] Specifically, in the embodiment of the present application, the depth of the limiting groove 21 may be equal to the height H of the limiting ring 11. Of course, in other embodiments of the present application, a gap may exist between the limiting ring 11 and the limiting groove 21 along the radial direction of the drum shaft 1. In the embodiment of the present application, the depth of the limiting groove 21 may be greater than the height H of the limiting ring 11, that is, the depth of the limiting groove 21 may be equal to the height H of the limiting ring 11 + the second preset gap. In this embodiment, the second preset gap may be the same as the first preset gap mentioned above, and no further description is given here.

[0072] In the embodiment of the present application, there is no restriction on the position of the limiting ring 11 on the drum shaft 1. For example, the limiting ring 11 can be located at the middle position along the axis of the drum shaft 1. The limiting ring 11 can also be located at the middle position along the axis of the drum shaft 1. Figure 3 As shown, it is located at the connection between the cylinder and the cone in the drum shaft 1. It is easy to understand that in the embodiment of the present application, there is no limitation on the position of the limiting groove 21 on the vibration damping sleeve 2, and no further description is given here. In order to make the vibration damping sleeve 2 fit more evenly with the drum shaft 1, so as to achieve a better vibration reduction effect, the center of gravity of the limiting ring 11 should coincide with the center of gravity of the drum shaft 1.

[0073] Step S340: based on the width S of the limiting ring 11 , obtain the width of the limiting groove 21 .

[0074] Specifically, in the embodiment of the present application, the width of the limiting groove 21 may be equal to the width S of the limiting ring 11. Of course, in the embodiment of the present application, in order to allow a gap between the limiting groove 21 and the limiting ring 11 along the axial direction of the drum shaft 1, in the embodiment of the present application, the width of the limiting groove 21 may be greater than the width S of the limiting ring 11. That is, the width of the limiting groove 21 may be equal to the width S of the limiting ring 11 + the third preset gap. In this embodiment, the third preset gap may be the same as the first preset gap and the second preset gap mentioned above, and no further details are given here.

[0075] In one embodiment of the present application, if Figure 5 and Figure 6 As shown, the vibration damping sleeve 2 is provided with an opening 22, and the size parameters of the vibration damping sleeve also include: Figure 6 The width h of the opening 22 is shown. In the embodiment of the present application, the width h of the opening 22 can be an empirical value or a fixed value. Specifically, in the embodiment of the present application, the width h of the opening 22 can be obtained by converting the cold and hot states, that is, in the working state, as the vibration damping sleeve 2 is heated and expanded, the opening 22 gradually decreases, and the size of the opening 22 can be 0 when the gas turbine is at the maximum working condition. That is to say, in the embodiment of the present application, the width h of the opening 22 in the cold state can be converted by the thermal expansion coefficient of the material.

[0076] In one embodiment of the present application, step S300, based on the size parameters of the drum shaft, obtaining the size parameters of the vibration damping sleeve further includes step S350:

[0077] Step S350 : Based on the height H of the limiting ring 11 and the inner diameter D of the drum shaft 1 , the width h of the opening 22 is obtained.

[0078] Specifically, in the embodiment of the present application, after the opening 22 on the vibration damping sleeve 2 is closed, the outer diameter of the vibration damping sleeve 2 needs to be smaller than the inner diameter of the limiting ring 11, so that the vibration damping sleeve 2 can smoothly pass through the limiting ring 11. If the outer diameter of the opening 22 on the vibration damping sleeve 2 after closing is smaller than the inner diameter of the limiting ring 11, the outer circumference of the opening 22 on the vibration damping sleeve 2 after closing must be smaller than the inner circumference of the limiting ring 11. Assuming that the outer circumference of the opening 22 on the vibration damping sleeve 2 before closing is the first circumference; the inner circumference of the limiting ring 11 is the second circumference, then the first circumference minus the width h needs to be smaller than the second circumference. That is to say, in the embodiment of the present application, the width h of the opening 22 can be obtained according to the first circumference and the second circumference.

[0079] Step S400: obtaining the vibration-damping damping sleeve based on the structure and size parameters of the vibration-damping damping sleeve.

[0080] It should be clear that if the structure and size parameters of the vibration damping sleeve are obtained, the entity or three-dimensional digital model of the vibration damping sleeve can be obtained based on the structure and size parameters of the vibration damping sleeve.

[0081] In one embodiment of the present application, after obtaining the vibration-damping damping sleeve based on the structure and size parameters of the vibration-damping damping sleeve in step S400, the method further includes steps S500 and S600.

[0082] Step S500: obtaining a vibration reduction evaluation result based on the vibration reduction damping sleeve.

[0083] It should be clear that after the vibration damping sleeve is obtained in step S400, a vibration damping evaluation can be performed on the vibration damping sleeve to test whether the vibration damping sleeve meets the design requirements. As can be seen from the foregoing, in the embodiment of the present application, the obtained vibration damping sleeve can be a three-dimensional digital model or a physical entity. That is to say, in step S500, software (for example, Fluent software) can be used to simulate the vibration of the drum shaft equipped with the designed vibration damping sleeve to obtain the vibration reduction evaluation result; the entity of the vibration damping sleeve can also be directly installed in the drum shaft, and the gas turbine is turned on to perform an actual test on the vibration of the drum shaft to obtain the vibration reduction evaluation result.

[0084] Step S600: If the vibration reduction evaluation result is qualified, the design is terminated; if the vibration reduction evaluation result is unqualified, the process returns to step S300.

[0085] It is easy to understand that in step S500, if the test result of the vibration damping sleeve meets the design requirements, that is, the vibration reduction evaluation result is qualified, it means that the designed vibration damping sleeve is qualified, and the structure and size parameters of the vibration damping sleeve can be saved at this time. If the test result of the vibration damping sleeve does not meet the design requirements, that is, the vibration reduction evaluation result is unqualified, it means that the designed vibration damping sleeve is unqualified, that is, the vibration damping sleeve needs to be redesigned.

[0086] The vibration damping sleeve designed by the design method of the drum shaft damping structure proposed in the embodiment of the present application has a simple structure, is easy to process, and is convenient to assemble and disassemble, and can meet the needs of multiple assembly and disassembly. Under the joint action of structural damping and dry friction damping, the vibration of the drum shaft can be significantly reduced, and the working reliability of the drum shaft can be improved. Compared with the existing technology, its use cost is lower and its sustainability is better.

[0087] 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 drum shaft damping structure, comprising a drum shaft (1), It is characterized in that The internal movable sleeve of the drum shaft (1) is connected with a vibration-damping sleeve (2); a limiting structure is arranged between the vibration-damping sleeve (2) and the drum shaft (1), and the limiting structure is used to limit the relative displacement of the vibration-damping sleeve (2) and the drum shaft (1) along a first direction; the first direction is parallel to the axis of the drum shaft (1).

2. The drum shaft damping structure according to claim 1, It is characterized in that The limiting structure comprises: A limiting ring (11) arranged on the inner side of the drum shaft (1); A limiting groove (21) is arranged on the outer side surface of the vibration-reducing damping sleeve (2); the limiting groove (21) is adapted to the limiting ring (11).

3. The drum shaft damping structure according to claim 2, It is characterized in that The vibration-damping sleeve (2) is provided with an opening (22).

4. The drum shaft damping structure according to any one of claims 1 to 3, It is characterized in that The vibration-damping sleeve (2) is provided with a plurality of holes, each hole being used for reducing the weight of the vibration-damping sleeve (2).

5. A design method for a drum shaft damping structure, It is characterized in that The method comprises: S100: Acquire the structure and size parameters of the drum shaft; S200: Based on the structure of the drum shaft, obtain the structure of the vibration damping sleeve; S300: Acquire size parameters of the vibration damping sleeve based on size parameters of the drum shaft; S400: Obtaining a vibration-damping damping sleeve based on the structure and size parameters of the vibration-damping damping sleeve.

6. The design method of the drum shaft damping structure according to claim 5, It is characterized in that The size parameters of the drum shaft include the length (L), inner diameter (D), mounting edge thickness (n) and thickness (m) of the drum shaft; the size parameters of the vibration damping sleeve include the length and outer diameter of the vibration damping sleeve; the step S300, based on the size parameters of the drum shaft, obtaining the size parameters of the vibration damping sleeve includes: S310: Obtaining the length of the vibration damping sleeve based on the length (L), the thickness (n) and the thickness (m) of the drum shaft; S320: Based on the inner diameter (D) of the drum shaft, obtain the outer diameter of the vibration damping sleeve.

7. The design method of the drum shaft damping structure according to claim 6, It is characterized in that The size parameters of the drum shaft also include the height (H) and width (S) of the limiting ring; the size parameters of the vibration damping sleeve also include the depth and width of the limiting groove; the step S300 of obtaining the size parameters of the vibration damping sleeve based on the size parameters of the drum shaft also includes: S330: Based on the height (H) of the limiting ring, obtaining the depth of the limiting groove; S340: Based on the width (S) of the limiting ring, obtain the width of the limiting groove.

8. The design method of the drum shaft damping structure according to claim 7, It is characterized in that The size parameters of the vibration damping sleeve also include the width (h) of the opening; the step S300 of obtaining the size parameters of the vibration damping sleeve based on the size parameters of the drum shaft also includes: Based on the height (H) of the limiting ring and the inner diameter (D) of the drum shaft, the width (h) of the opening is obtained.

9. The design method of the drum shaft damping structure according to any one of claims 5 to 8, It is characterized in that After obtaining the vibration damping sleeve based on the structure and size parameters of the vibration damping sleeve in S400, the method further includes: S500: obtaining a vibration reduction evaluation result based on the vibration reduction damping sleeve; S600: If the vibration reduction evaluation result is qualified, the design is terminated; if the vibration reduction evaluation result is unqualified, the process returns to step S300.

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