Gas turbine blade assembly circumferential restraint system

Abstract

The application discloses a circumferential limiting system of a blade group, which comprises a blade group and a circumferential limiting structure. The blade group comprises a plurality of circumferentially distributed blades. The circumferential limiting structure is arranged in the circumferential gap between two adjacent blades in the blade group. When the blades in the blade group move circumferentially, the circumferential limiting structure is in contact with the blade retaining surface, so as to reduce the contact stress between the blade and the circumferential limiting structure, thereby reducing the strength requirement of the circumferential limiting structure. The circumferential limiting structure in the adaptive mode has a higher tolerance to the cumulative error generated by the machining of each stationary blade. The slotting precision requirement of each stationary blade is reduced, thereby greatly reducing the blade production cost and improving the economic value.

Description

Technical Field

[0001] This invention relates to a gas turbine limiting system, and more specifically, to a circumferential limiting system for a gas turbine blade assembly. Background Technology

[0002] The blades of a heavy-duty gas turbine compressor consist of moving blades and stationary blades. The stationary blades are tenoned to the compressor cylinder or retaining ring via a tenon and mortise structure. During the assembly or operation of a heavy-duty gas turbine, a certain number of stationary blades are usually treated as a whole and circumferentially restrained to prevent circumferential movement and control the circumferential clearance between the stationary blades.

[0003] Common circumferential limiting methods in existing technologies include Figure 1 As shown, in order to prevent the circumferential movement of the stationary blade group 2, a groove is cut on a certain stationary blade according to the calculated angle, and a radial pin 5 is inserted into the groove. The groove surface and the side of the radial pin 5 make surface contact, which can prevent the blade group 2 from moving to one side.

[0004] Existing circumferential limiting technology solutions are widely used, but they also have certain problems: First, in order to accurately determine the angle between the slotted surface and the radial pin contact surface using simulation calculations, the machining accuracy requirements for the side surface of each stage of stationary blade are very high, increasing the cost of manufacturing the stationary blades; Second, the number of stationary blades with circumferential positioning and limiting is large, and the accumulation of machining errors on the side surface of each stationary blade will eventually cause the angle of the final slotted surface to not correspond to the angle of the original design, so that the edge of the slotted surface and the side surface of the radial pin will eventually be joined in line contact, generating a large contact stress, which will adversely affect the strength of the radial pin.

[0005] Patent CN206626020U discloses a stator blade positioning pin structure, in which the pin restricts the circumferential movement of the end stator blade. A pin insertion hole is formed on the restricting component for the pin to pass through, and a pin groove is formed on the end stator blade for the front end of the pin to enter.

[0006] Patent CN204663589U discloses a structure for adjusting the circumferential clearance of a stator vane. The positioning pin includes a pin shaft and an eccentric rod positioned below the pin shaft. The pin shaft and eccentric rod are eccentrically positioned, with the pin shaft inserted into a limiting hole and the eccentric rod inserted into a slot. When adjusting the clearance between two stator vanes, the positioning pin corresponding to one or both stator vanes is rotated. The pin shaft of the positioning pin engages with a bearing in the limiting hole, and the eccentric rod below the pin shaft rotates around the axis of the pin shaft. Simultaneously, the eccentric rod, through its engagement with the slot, drives the stator vane to move circumferentially, thereby adjusting the clearance between the two stator vanes.

[0007] In the above two patents, the technical problem of the final linear contact between the edge of the static blade slot surface and the positioned side surface, which results in a large contact stress, is not solved when the static blade group string moves or the error accumulation of each static blade processing is in the working state.

[0008] In view of the above technical problems, the present application is proposed. SUMMARY

[0009] The main purpose of the present application is to provide a blade group circumferential limiting system. That is, a self-adaptive pin structure is used in circumferential limiting, the precision of the static blade slot angle is reduced, the adaptability to the cumulative tolerance is improved, and linear contact is avoided during assembly and work.

[0010] In order to achieve the above purpose, the present application provides a blade group circumferential limiting system, which comprises a blade group and a circumferential limiting structure. The blade group comprises a plurality of circumferentially distributed blades. The circumferential limiting structure is arranged in the circumferential gap between two adjacent blades in the blade group. When the blades in the blade group move circumferentially, the circumferential limiting structure is in contact with the blade forming surface to reduce the contact stress between the blade and the circumferential limiting structure.

[0011] Further, the circumferential limiting structure comprises a fixed component and a movable component. The movable component is sleeved in the fixed component. When the blade group moves circumferentially, the movable component can rotate relative to the fixed component to ensure that the movable component is in surface contact with the blade.

[0012] Further, the fixed component comprises a first cylinder, which forms a first rotary surface. The first cylinder is provided with a slot, which forms an inner circumferential surface. The slot is a cylindrical hole opened in the side of the first cylinder. The axis of the first cylinder and the axis of the slot are perpendicular and do not intersect.

[0013] Further, the rotary radius of the first cylinder is greater than the radius of the slot and less than the diameter of the slot.

[0014] Further, the perpendicular distance between the axis of the first cylinder and the axis of the slot is greater than the radius of the slot.

[0015] Further, the first cylinder further comprises a first plane, which is coplanar with the axis of the slot and perpendicular to the end face of the first cylinder.

[0016] Further, the fixed component comprises a second cylinder, which is connected with the gas turbine cylinder. The second cylinder is coaxial with the first cylinder, and the rotary radius of the second cylinder is greater than the rotary radius of the first cylinder.

[0017] Further, the movable component comprises a first contact surface, which is a circumferential surface. The first contact surface is in surface contact with the slot.

[0018] Further, the movable component comprises a second contact surface, and the second contact surface forms a planar contact with the vane.

[0019] Further, the movable component comprises a first end surface and a second end surface, and the first end surface and the second end surface are provided with anti-disengagement components, and the anti-disengagement components are capable of being bent from the first end surface and the second end surface to a first rotary surface formed by the first cylinder, and the anti-disengagement components are capable of limiting the axial direction of the movable component.

[0020] Further, the bent part of the anti-disengagement component exceeds the first end surface and the second end surface of the movable component, and does not exceed the outer edge of the second cylinder.

[0021] Further, the vane is provided with a mounting groove, and the circumferential limiting structure is arranged in the mounting groove.

[0022] Further, the mounting groove comprises a first side surface, and when the vane group moves circumferentially, the circumferential limiting structure keeps a planar contact with the first side surface.

[0023] Further, the depth of the mounting groove is greater than the sum of the height of the first plane and the radius of the groove.

[0024] Further, the fixed component is connected with a cylinder and / or a holding ring, and when the vane group moves circumferentially, the position of the fixed component remains unchanged.

[0025] Further, the vane group is fixed on the cylinder and / or the holding ring.

[0026] Further, the vane group is connected with the cylinder and / or the holding ring in a tenon joint mode.

[0027] The technical scheme of the present application at least has the following beneficial effects:

[0028] 1. In the working state, when the vane group moves circumferentially or the cumulative error of the processing of each vane causes the position of the first side surface of the mounting groove of the vane to change, the first side surface of the mounting groove and the movable component generate a force, which pushes the movable component to rotate in the groove of the fixed component, so that the movable component of the circumferential limiting structure can automatically adapt to the position change of the mounting groove.

[0029] 2. The movable component of the circumferential limiting structure automatically adapts to the position change of the mounting groove, so that the circumferential limiting structure and the first side surface of the mounting groove can always keep a planar contact, the contact stress is reduced, the strength requirement of the circumferential limiting structure is reduced, and the reliability of numerical simulation is improved.

[0030] 3. The circumferential limiting structure adopts a combination of fixed and movable components. The fixed components are fixedly connected to the cylinder / holding ring, while the movable components can automatically adapt to changes in the contact surface position of the blade mounting slot, combining stability and flexibility, and effectively realizing the functions of fixed connection and adaptive flexible movement.

[0031] 4. The adaptive circumferential limiting structure has a higher tolerance for the cumulative error generated during the processing of each stationary blade, reduces the grooving accuracy requirement for each stationary blade, greatly reduces production and manufacturing costs, and increases economic value. Attached Figure Description

[0032] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 This illustrates a common method for circumferentially limiting compressor stator blades in the prior art;

[0034] Figure 2 A front view of the circumferential limiting system according to an embodiment of the present invention is shown;

[0035] Figure 3 An isometric view of the circumferential limiting structure and the blade according to an embodiment of the present invention is shown;

[0036] Figure 4 A front view of the circumferential limiting structure according to an embodiment of the present invention is shown;

[0037] Figure 5 This figure shows an isometric view of the fixed component structure according to an embodiment of the present invention;

[0038] Figure 6 A front view of the fixing component according to an embodiment of the present invention is shown;

[0039] Figure 7 An isometric view of the movable component structure according to an embodiment of the present invention is shown;

[0040] Figure 8 An isometric view of the circumferential limiting structure and blade in an ideal state according to an embodiment of the present invention is shown;

[0041] Figure 9 The diagram shows a front view of the circumferential limiting structure and blade in an ideal state according to an embodiment of the present invention;

[0042] Figure 10 The diagram shows a front view of the circumferential limiting structure and blades in an adaptive state according to an embodiment of the present invention; and

[0043] Figure 11The connection profile of the vane set and the circumferential limiting structure of the present application and the cylinder / retaining ring is shown.

[0044] In the above drawings, the following reference signs are used:

[0045] 1. circumferential limiting structure; 2. vane set; 3. cylinder; 4. retaining ring; 5. radial pin; 10. fixed part; 12. movable part; 22. vane; 102. first cylinder; 103. second cylinder; 122. first contact surface; 124. second contact surface; 126. first end surface; 128. second end surface; 130. anti-disengagement part; 222. mounting groove; 1021. first rotary surface; 1022. slotted groove; 1023. inner circumferential surface; 1024. first flat surface; 2221. first side surface. DETAILED DESCRIPTION

[0046] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with embodiments.

[0047] The present application will be further described in detail below in combination with specific embodiments, which cannot be understood as limiting the scope of the present application. The term "comprising" indicates the presence of a feature, but does not exclude the presence or addition of one or more other features; the terms "transverse", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application; in addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0048] In the description, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more. EMBODIMENT

[0049] The present application provides a vane set circumferential limiting system, which comprises a vane set and a circumferential limiting structure, wherein the vane set comprises a plurality of vanes, and the circumferential limiting structure comprises a fixed part and a movable part, and the fixed part and the movable part are connected by a radial pin. Figure 2 and Figure 3As shown, the circumferential limiting system comprises a vane group 2 and a circumferential limiting structure 1, the vane group 2 comprises a plurality of circumferentially distributed vanes, each vane is connected in a dovetail manner. One vane in the vane group 2 is a vane 22 with a mounting groove 222, the circumferential limiting structure 1 is arranged in the circumferential gap between two adjacent vanes in the vane group 2 and is clamped into the mounting groove 222 of the vane 22.

[0050] When the vane 22 in the vane group 2 moves circumferentially, the circumferential limiting structure 1 can maintain surface contact with the vane 22 to prevent the vane 22 from moving and reduce the contact stress between the vane 22 and the circumferential limiting structure 1, so that the circumferential limiting structure 1 and the mounting groove 222 avoid linear contact during actual operation, reduce the strength requirement of the circumferential limiting structure, and improve the reliability of numerical simulation.

[0051] As shown in Figure 4 , the circumferential limiting structure 1 comprises a fixed component 10 and a movable component 12, the fixed component 10 comprises a first cylinder 102. The movable component 12 is sleeved in the first cylinder 102, and when the vane group 2 moves circumferentially, the movable component 12 can rotate relative to the fixed component 10 to ensure that the movable component 12 forms surface contact with the vane 22. The circumferential limiting structure 1 adopts the combination of the fixed component 10 and the movable component 12, which has stability and flexibility, effectively realizing the functions of fixed connection and adaptive flexible movement.

[0052] As shown in Figure 5 , the first cylinder 102 of the fixed component 10 is provided with a slotted groove 1022, the movable component 12 is sleeved in the slotted groove 1022, the slotted groove 1022 forms an inner circumferential surface 1023, the slotted groove 1022 is a cylindrical hole opened on the side of the first cylinder 102, the first cylinder 102 further comprises a first plane 1024, and the remaining curved surface of the side of the first cylinder constitutes a first revolution surface 1021.

[0053] In addition, the fixed component 10 further comprises a second cylinder 103, the second cylinder 103 is connected with the gas turbine cylinder / retaining ring, the second cylinder 103 is coaxial with the first cylinder 102, and the revolution radius of the second cylinder 103 is greater than that of the first cylinder 102.

[0054] As shown in Figure 6As shown, the present application limits the structural size of the fixed part 10, and the design standard should at least meet the following requirements: the axis of the first cylinder 102 and the axis of the slot 1022 are perpendicular and do not intersect. In addition, the first plane 1024 is coplanar with the axis of the slot 1022, and is perpendicular to the end face of the first cylinder 102, facilitating the installation of the movable part into the slot 1022, avoiding interference with the structure of the blade mounting slot 222 when the movable part rotates. In addition, the radius of revolution of the first cylinder 102 is greater than the radius of the slot 1022, and less than the diameter of the slot 1022, and the perpendicular distance between the axis of the first cylinder 102 and the axis of the slot 1022 is greater than the radius of the slot 1022, thereby ensuring the structural strength of the first cylinder 102.

[0055] In addition, the fixed part 10 used in this application can be obtained by ordinary pins according to the above-mentioned size design and machining calibration, and is suitable for batch processing production, with lower production cost.

[0056] As shown in Figure 7 The movable part 12 of the circumferential limiting structure 1 includes a first contact surface 122, which is a circumferential surface, and the first contact surface 122 forms a surface contact with the slot 1022. The movable part 12 also includes a second contact surface 124, which forms a planar contact with the blade 22. In the working state, when the static blade string moves or the cumulative error of each static blade processing causes the position of the mounting slot 222 of the blade to change, the mounting slot will exert a force on the first contact surface 122 of the movable part 12, pushing the movable part 12 to rotate in the slot 1022 of the fixed part, so that the movable part 12 of the circumferential limiting structure 1 can automatically adapt to the position change of the mounting slot 222.

[0057] In addition, the movable part 12 also includes a first end surface 126 and a second end surface 128, and the first end surface 126 and the second end surface 128 are provided with anti-disengagement parts 130, which can be bent from the first end surface 126 and the second end surface 128 to the first revolution surface 1021 formed by the first cylinder 102, to axially limit the movable part 12. In this application, the bent part of the anti-disengagement part 130 exceeds the first end surface 126 and the second end surface 128 of the movable part 12, and does not exceed the outer edge of the second cylinder 103. The length of the bent part of the anti-disengagement part 130 is limited to prevent the movable part 12 from sliding out, and also to prevent the entire circumferential limiting structure 1 from being unable to be radially inserted into the pin hole.

[0058] In combination with Figure 7 and Figure 8As shown, the specific steps for assembling the circumferential limiting structure 1 are as follows: First, insert the movable part 12 into the slot 1022 of the fixed part 10. During assembly, it can be fixed with soluble glue, etc., and the glue is melted after assembly to the final position. Second, bend the anti-detachment part 130 from the first end face 126 and the second end face 128 toward the first rotating surface 1021 formed by the first cylinder 102.

[0059] Combination Figure 8 and Figure 9 As shown, in an ideal state without circumferential movement of the blade 22 and machining errors, the relative positions of the circumferential limiting structure 1 and the blade 22 are as shown. The mounting groove 222 includes a first side surface 2221, which is in close contact with the second contact surface 124 of the movable component 12, and the first side surface is parallel to the axis of the first cylinder 102. In addition, in this invention, the depth of the mounting groove 222 is greater than the sum of the height of the first plane 1024 and the radius of the slot 1022 of the fixed component 10, ensuring the contact area between the first side surface 2221 of the mounting groove 222 and the first contact surface 122 of the movable component 12.

[0060] like Figure 10 As shown, when the circumferential movement of the blade 22 or the accumulated error of the side surfaces of each stationary blade causes a change in the relative position between the circumferential limiting structure 1 and the blade 22, the movable part of the circumferential limiting structure 1 rotates at a certain angle to maintain surface contact with the first side surface 2221. At this time, the circumferential limiting structure 1 reaches an adaptive state, which can automatically adapt to the change in the relative position of the blade 22, and always maintain a tight fit between the first side surface 2221 and the second contact surface 124 of the movable part 12. This ensures that the circumferential limiting structure 1 and the first side surface 2221 of the mounting groove 222 can always maintain a planar contact, greatly reducing the contact stress between the circumferential limiting structure and the mounting groove, and reducing the strength requirements of the circumferential limiting structure.

[0061] Furthermore, the adaptive circumferential limiting structure has a higher tolerance for the cumulative errors generated during the machining of each stationary blade, reducing the accuracy requirements for grooving the stationary blades, greatly reducing production costs, and increasing economic value.

[0062] like Figure 11 As shown, the fixing component 10 of the circumferential limiting structure 1 is connected to the cylinder 3 and / or the retaining ring 4. When the blade assembly 2 moves circumferentially, the positions of the fixing component 10 and the cylinder 3 and / or the retaining ring 4 remain unchanged. The blade assembly 2 is also fixed to the cylinder 3 and / or the retaining ring 4. The blade assembly 2 is connected to the cylinder 3 and / or the retaining ring 4 by a tenon joint.

[0063] In summary, from the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0064] 1. When the first side of the installation groove changes in position due to the string movement of the stationary blade group or the cumulative error of the processing of each stationary blade in the working state, the first side of the installation groove exerts force on the first contact surface of the movable part, pushing the movable part to rotate in the slot of the fixed part, so that the movable part of the circumferential limiting structure can automatically adapt to the position change of the installation groove; 2. The movable part of the circumferential limiting structure automatically adapts to the position change of the installation groove, so that the circumferential limiting structure and the first side of the installation groove can always maintain a planar contact form, reducing the contact stress and reducing the strength requirement of the circumferential limiting structure; 3. The circumferential limiting structure adopts the combination of fixed part and movable part, the fixed part is fixedly connected on the cylinder / holding ring, and the movable part can automatically adapt to the change of the position of the blade installation groove contact surface, and has stability and flexibility, realizing fixed connection and adaptive flexible movement; 4. The circumferential limiting structure adopting the adaptive mode has higher tolerance to the cumulative error generated by the processing of each stationary blade, reduces the requirement for the slot precision of each stationary blade, reduces the production cost, and improves the economic value.

[0065] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A circumferential limiting system for a blade assembly, comprising a blade assembly (2) and a circumferential limiting structure (1), wherein the blade assembly (2) comprises a plurality of circumferentially distributed blades (22), characterized in that, The circumferential limiting structure (1) is disposed in the circumferential gap between two adjacent blades (22) in the blade group (2). When the blades (22) in the blade group (2) move circumferentially, the circumferential limiting structure (1) maintains surface contact with the blades (22) to reduce the contact stress between the blades (22) and the circumferential limiting structure (1). The circumferential limiting structure (1) includes a fixed component (10) and a movable component (12). The movable component (12) is sleeved in the fixed component (10). When the blade (22) in the blade group (2) moves circumferentially, the movable component (12) rotates relative to the fixed component (10) to ensure that the movable component (12) and the blade (22) form a surface contact.

2. The blade assembly circumferential limiting system according to claim 1, characterized in that, The fixing component (10) includes a first cylinder (102), which forms a first rotating surface (1021). The first cylinder (102) has a slot (1022) forming an inner circumferential surface (1023). The slot (1022) is a cylindrical hole opened on the side of the first cylinder (102). The axis of the first cylinder (102) and the axis of the slot (1022) are perpendicular and do not intersect.

3. The blade assembly circumferential limiting system according to claim 2, characterized in that, The radius of gyration of the first cylinder (102) is greater than the radius of the slot (1022) and smaller than the diameter of the slot (1022).

4. The blade assembly circumferential limiting system according to claim 3, characterized in that, The vertical distance between the axis of the first cylinder (102) and the axis of the slot (1022) is greater than the radius of the slot (1022).

5. The blade assembly circumferential limiting system according to claim 4, characterized in that, The first cylinder (102) further includes a first plane (1024), which is coplanar with the axis of the slot (1022) and perpendicular to the end face of the first cylinder (102).

6. The blade assembly circumferential limiting system according to claim 5, characterized in that, The fixed component (10) includes a second cylinder (103) connected to the gas turbine cylinder. The second cylinder (103) is coaxial with the first cylinder (102), and the radius of rotation of the second cylinder (103) is greater than the radius of rotation of the first cylinder (102).

7. The blade assembly circumferential limiting system according to claim 6, characterized in that, The movable component (12) includes a first contact surface (122), which is a circumferential surface, and the first contact surface (122) forms a surface contact with the slot (1022).

8. The blade assembly circumferential limiting system according to claim 7, characterized in that, The movable component (12) includes a second contact surface (124) that forms a planar contact with the blade (22).

9. The circumferential limiting system for the blade assembly according to claim 8, characterized in that, The movable component (12) includes a first end face (126) and a second end face (128). Both the first end face (126) and the second end face (128) are provided with anti-detachment components (130). The anti-detachment components (130) are bent from the first end face (126) and the second end face (128) toward the first rotating surface (1021) formed by the first cylinder (102) to limit the axial movement of the movable component (12).

10. The circumferential limiting system for the blade assembly according to claim 9, characterized in that, The bent portion of the anti-detachment component (130) extends beyond the first end face (126) and the second end face (128) of the movable component (12), and does not exceed the outer edge of the second cylinder (103).

11. The blade assembly circumferential limiting system according to any one of claims 5-8, characterized in that, The blade (22) has an installation groove (222), and the circumferential limiting structure (1) is disposed in the installation groove (222).

12. The circumferential limiting system for the blade assembly according to claim 11, characterized in that, The mounting groove (222) includes a first side surface (2221). When the blades (22) in the blade group (2) move circumferentially, the circumferential limiting structure (1) maintains surface contact with the first side surface (2221).

13. The circumferential limiting system for the blade assembly according to claim 11, characterized in that, The depth of the mounting groove (222) is greater than the sum of the height of the first plane (1024) and the radius of the slot (1022).

14. The circumferential limiting system for the blade assembly according to claim 1, characterized in that, Includes a cylinder (3) and / or a retaining ring (4), the fixing component (10) is connected to the cylinder (3) and / or the retaining ring (4), and the position of the fixing component (10) remains unchanged when the blade (22) in the blade group (2) moves circumferentially.

15. The circumferential limiting system for the blade assembly according to claim 14, characterized in that, The blade assembly (2) is fixed to the cylinder (3) and / or the retaining ring (4).

16. The circumferential limiting system for the blade assembly according to claim 14 or 15, characterized in that, The blade assembly (2) is connected to the cylinder (3) and / or the retaining ring (4) by a tenon joint.

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