Gas turbine compressor blade circumferential locking device

Abstract

The utility model provides a gas turbine compressor blade circumferential locking device, the circumferential locking device is installed in a wheel disc groove of a compressor, the circumferential locking device comprises a front separation block and a rear separation block, the front separation block comprises a first tenon to be clamped with the wheel disc groove, and the rear separation block comprises a second tenon to be clamped with the wheel disc groove; the interlocking assembly is arranged between the front separation block and the rear separation block, and the interlocking assembly locks the front separation block and the rear separation block; the interlocking assembly comprises a middle block, a locking rod and a pin. The two sides of the middle block are attached to the front separation block and the rear separation block. The locking rod can be connected with the middle block, the front separation block and the rear separation block; the pin can be arranged between the middle block and the locking rod in a penetrating mode. According to the scheme, the mode that the spring is pre-installed and the pin is finally fixed is adopted, the influence possibly caused by spring failure is eliminated, and the risk of block falling is avoided.

Description

Technical Field

[0001] This utility model relates to the axial positioning and assembly design of compressor blade roots, specifically, to a circumferential locking structure for gas turbine compressor blades. Background Technology

[0002] The compressor blades of a gas turbine consist of moving blade rows and stationary blade rows. The moving blade rows are mounted on the rotor or rotor disk via tenon and mortise structures. The root locking of the moving blades is divided into axial locking and circumferential locking. When circumferentially locking the blade roots of the compressor moving blades, after the circumferentially mounted blades slide into the rotor disk, it is necessary to prevent their roots from moving circumferentially along the tenon and mortise of the rotor disk; therefore, a circumferential locking structure needs to be designed.

[0003] Existing technical solutions typically use methods such as spring tightening, nut and screw engagement, welding, and riveting to fix the final locking block. While these solutions have some engineering application experience, their constraint methods all have certain drawbacks. In existing compressor circumferentially mounted blade locking structures, the final locking block usually uses nuts or other locking components. This requires consideration of the impact of thread strength, thread preload, and thread failure, as well as the risk of block falling off due to riveting and anti-loosening measures for the nut. Furthermore, during major overhauls, the nut is prone to rusting and becoming difficult to remove. Other locking methods involve directly riveting the final locking block, causing deformation, which easily leads to block falling off and is difficult to remove.

[0004] In view of the above technical problems, this utility model is hereby introduced. Utility Model Content

[0005] The main purpose of this utility model is to provide a circumferential locking structure for gas turbine compressor blades. The clamp adopts a spring pre-installation and pin final fixation method to eliminate the possible impact of spring failure and eliminate the risk of blade falling off.

[0006] To achieve the above objectives, this utility model provides a circumferential locking device for gas turbine compressor blades. The circumferential locking device is installed in the compressor disc groove and includes a front separating block and a rear separating block. The front separating block includes a first tenon for engaging with the disc groove, and the rear separating block includes a second tenon for engaging with the disc groove. An interlocking assembly is disposed between the front separating block and the rear separating block and locks the front separating block and the rear separating block. The interlocking assembly includes a middle block, a locking rod, and a pin. The two sides of the middle block are fitted with the front separating block and the rear separating block. The locking rod can connect the middle block, the front separating block, and the rear separating block. The pin can pass through the middle block and the locking rod.

[0007] The following are further optimizations of the above solution by this utility model:

[0008] Furthermore, the intermediate block includes a first body portion and a second body portion. A first blind hole groove is formed on the first body portion, and a second blind hole groove is formed on the second body portion. The first blind hole groove and the second blind hole groove can accommodate a pin.

[0009] Furthermore, the first body portion also has a first stop hole, the extension direction of which is perpendicular to the extension direction of the first blind hole groove, so that the pin is held in the first blind hole groove and the second blind hole groove through the first stop hole; and / or the second body portion also has a second stop hole, the extension direction of which is perpendicular to the extension direction of the second blind hole groove, so that the pin is held in the first blind hole groove and the second blind hole groove through the second stop hole.

[0010] Furthermore, the first body part is L-shaped, with its long side installed along the radial direction of the wheel groove. The first blind hole groove and the first stop hole are opened on the long side, and the short side of the first body part is provided with a first half hole. The second body part is symmetrically arranged with the first body part, and the short side of the second body part is provided with a second half hole. The first half hole and the second half hole are adjacent to form a complete positioning cylindrical surface, which can accommodate the locking rod.

[0011] Furthermore, the locking rod includes an anti-rotation part, a locking tongue part, and a positioning cylinder. The anti-rotation part is provided with a pin hole that can accommodate a pin. The locking rod interacts with the front and rear separating blocks through the locking tongue part.

[0012] Furthermore, the front and rear separation blocks are provided with track grooves and stepped surfaces, the track grooves accommodating the locking tongue; the locking tongue includes a smooth inclined surface, and in the locked state, the smooth inclined surface interacts with the stepped surface to lock.

[0013] Furthermore, the front separating block is provided with a first spring groove, in which a first spring is installed, and the first spring causes the first tenon to be tightly attached to the corresponding surface of the wheel groove; the rear separating block is provided with a second spring groove, in which a second spring is installed, and the second spring causes the second tenon to be tightly attached to the corresponding surface of the wheel groove.

[0014] Furthermore, the front separating block is provided with a first step, and the rear separating block is provided with a second step. The first step and the second step are combined to form a bearing surface, and an intermediate block is placed on the bearing surface.

[0015] Furthermore, the cross-section of the pin can be one or more of the following: trapezoidal, dovetail, or triangular.

[0016] Furthermore, the cross-sections of the first blind hole groove and the second blind hole groove correspond to the pin and are one or more of the following: trapezoidal, dovetail, and triangular.

[0017] By applying the technical solution of this utility model, at least the following beneficial effects are achieved:

[0018] 1. The present invention adopts a mechanical connection, using a spring pre-installation and pin final fixation method to eliminate the possible impact of spring failure and eliminate the risk of block falling off.

[0019] 2. Furthermore, there is no need to consider the impact of preload or thread failure, and it can be easily removed by simply cutting it off during major repairs.

[0020] 3. When the contact surfaces of the front and rear separating blocks and the wheel are in close contact, the use of spring pre-tensioning and final inclined plane tightening can eliminate the effect of failure of the springs to tighten properly. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 A schematic diagram of the front separation block structure is shown;

[0023] Figure 2 A schematic diagram of the rear separation block structure is shown;

[0024] Figure 3 A schematic diagram of the pin structure is shown;

[0025] Figure 4 A schematic diagram of the pin structure is shown;

[0026] Figure 5 A schematic diagram of the intermediate block structure is shown;

[0027] Figure 6 A schematic diagram of the locking rod structure is shown;

[0028] Figure 7 An assembly diagram of the front and rear separation blocks and the middle block is shown;

[0029] Figure 8 A first pre-installation schematic diagram is shown;

[0030] Figure 9 A second pre-installation schematic diagram is shown;

[0031] Figure 10 A schematic diagram of the installation status is shown.

[0032] The above figures include the following reference numerals:

[0033] 1. Track groove; 2. Rear separator block; 3. Stepped surface; 4. First spring groove; 5. First blind hole groove; 6. First stop hole; 7. Positioning cylindrical surface; 8. First body part; 9. Working contact surface; 10. Intermediate block; 11. Pin hole; 12. Smooth inclined surface; 13. Front separator block; 14. Positioning cylinder; 15. Pin; 16. Locking rod; 17. First step; 18. Second step; 19. Second body part; 20. Second stop hole. Detailed Implementation

[0034] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] The present invention will be further described in detail below with reference to specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention. 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 "lateral," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In this description, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] like Figures 1-10As shown, a circumferential locking device for gas turbine compressor blades is installed in the compressor disc groove. The circumferential locking device includes a front separating block 13, a rear separating block 2, and an interlocking assembly. The front separating block 13 includes a first tenon for engaging with the disc groove, and the rear separating block 2 includes a second tenon for engaging with the disc groove. The interlocking assembly is disposed between the front separating block 13 and the rear separating block 2 for locking the front separating block 13 and the rear separating block 2. The interlocking assembly includes a middle block 10, a locking rod 16, and a pin 15. The two sides of the middle block 10 are fitted against the front separating block 13 and the rear separating block 2, and the middle block 10, the front separating block 13, and the rear separating block 2 can be connected together by the locking rod 16. To prevent the locking rod 16 from rotating, a pin 15 is inserted between the middle block 10 and the locking rod 16.

[0038] like Figure 5 As shown, the intermediate block 10 includes a first body portion 8 and a second body portion 19. A first blind hole groove 5 is formed on the first body portion 8, and a second blind hole groove is formed on the second body portion 19. The first and second blind hole grooves can accommodate a pin 15. The first body portion 8 also has a first stop hole 6, the extension direction of which is perpendicular to the extension direction of the first blind hole groove 5, thus holding the pin 15 within the first and second blind hole grooves. The second body portion 19 may also optionally have a second stop hole 20. The extension direction of the second stop hole 20 is perpendicular to the extension direction of the second blind hole groove, thus holding the pin 15 within the first and second blind hole grooves.

[0039] like Figures 3-5 As shown, the cross-section of pin 15 is one or more of trapezoidal, dovetail, and triangular shapes. The cross-sections of the first blind hole groove 5 and the second blind hole groove correspond to those of pin 15 and are one or more of trapezoidal, dovetail, and triangular shapes.

[0040] The first body part 8 is L-shaped, with its long side installed along the radial direction of the wheel groove. A first blind hole groove 5 and a first stop hole 6 are formed on the long side, and a first half-hole is formed on the short side. A second body part 19 is symmetrically arranged with the first body part 8 to form an intermediate block 10. A second half-hole is formed on the short side of the second body part 19, and the first and second half-holes are adjacent to form a complete positioning cylindrical surface 7 to accommodate the locking rod 16.

[0041] The locking lever 16 includes an anti-rotation part, a locking tongue part, and a positioning cylinder 14. The anti-rotation part is provided with a pin hole 11 to accommodate a pin 15. The locking lever 16 can interact with the front separating block 13 and the rear separating block 2 through the locking tongue part to form a locked state.

[0042] like Figure 1 , Figure 2As shown, the front separating block 13 and the rear separating block 2 are provided with a track groove 1 and a stepped surface 3, the track groove 1 accommodating the locking tongue. The locking tongue includes a smooth inclined surface 12. In the locked state, the smooth inclined surface 12 interacts with the stepped surface 3 to lock. The front separating block 13 is also provided with a first spring groove 4 for installing a first spring. The first spring causes the first tenon to be in contact with the corresponding surface of the wheel groove. The rear separating block 2 is provided with a second spring groove for installing a second spring, the second spring causing the second tenon to be in contact with the corresponding surface of the wheel groove.

[0043] To form a support surface for supporting the intermediate block 10, the front separating block 13 is provided with a first step 17, and the rear separating block 2 is provided with a second step 18. The first step 17 and the second step 18 are joined together to form a bearing surface for placing the intermediate block 10.

[0044] This invention employs a pre-installed spring and final fixation with pin 15, eliminating the potential impact of spring failure and the risk of chipping. Furthermore, it eliminates the need to consider the effects of preload and thread failure, allowing for easy removal by simply cutting during major repairs.

[0045] During the installation of the locking structure, the springs are placed into the first spring groove 4 and the second spring groove of the front separating block 13 and the rear separating block 2, respectively. The springs and pins 15 can be placed into the first blind hole groove 5 and the second blind hole groove of the intermediate block 10, respectively, and the pins 15 are blocked in the first blind hole groove 5 and the second blind hole groove by the first stop hole 6 or the second stop hole 20 so that they do not protrude.

[0046] Then, the assembled front separator 13, rear separator 2, and middle block 10 are placed into the wheel groove. At this time, the working contact surfaces 9 of the front separator 13 and rear separator 2 are pressed tightly against the corresponding surfaces of the wheel groove by the elastic force of the bottom spring.

[0047] Next, insert the locking rod 16 radially into the middle block 10 along the wheel disc, see Figure 8 This allows the positioning cylinder 14 of the locking rod 16 to insert into the positioning cylindrical surface 7 of the intermediate block 10. At this point, the locking rod 16 is rotated 90° so that the smooth inclined surface 12 of the locking rod 16 is in contact with the stepped surfaces 3 of the front separating block 13 and the rear separating block 2. At this time, the pin hole 11 of the locking rod 16 is aligned with the first blind hole groove 5 and the second blind hole groove of the intermediate block 10. Figure 9 As shown. When the front separating block 13 and the rear separating block 2 are in contact with the wheel, the use of spring pre-tensioning and final inclined plane tightening can eliminate the effect of failure to tighten due to possible spring failure.

[0048] Finally, the pin 15 placed in the intermediate block 10 is released through the first stop hole 6 or the second stop hole 20, allowing the pin 15 to be inserted into the pin hole 11 of the locking rod 16, thus completing the final fixation. Figure 10 As shown.

[0049] In summary, it can be seen from the above description that the embodiments of this utility model achieve the following technical effects:

[0050] 1. The present invention adopts a mechanical connection, using a spring pre-installation and pin final fixation method to eliminate the possible impact of spring failure and eliminate the risk of block falling off.

[0051] 2. Furthermore, there is no need to consider the impact of preload or thread failure, and it can be easily removed by simply cutting it off during major repairs.

[0052] 3. When the front separating block 13 and the rear separating block 2 are in contact with the wheel, the spring pre-tensioning and final inclined plane tightening method can eliminate the effect of failure of the spring to tighten.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A circumferential locking device for gas turbine compressor blades, wherein the circumferential locking device is installed in the rotor groove of the compressor, characterized in that, The circumferential locking device includes, A front separating block (13) and a rear separating block (2), the front separating block (13) including a first tenon for engaging with the wheel groove, and the rear separating block (2) including a second tenon for engaging with the wheel groove; an interlocking assembly disposed between the front separating block (13) and the rear separating block (2), the interlocking assembly locking the front separating block (13) and the rear separating block (2); The interlocking assembly includes: a middle block (10), a locking rod (16), and a pin (15). The two sides of the middle block (10) are fitted with the front separating block (13) and the rear separating block (2). The locking rod (16) can connect the middle block (10), the front separating block (13), and the rear separating block (2). The pin (15) can be inserted between the middle block (10) and the locking rod (16).

2. The circumferential locking device according to claim 1, characterized in that: The intermediate block (10) includes a first body part (8) and a second body part (19). A first blind hole groove (5) is formed on the first body part (8), and a second blind hole groove is formed on the second body part (19). The first blind hole groove (5) and the second blind hole groove can accommodate the pin (15).

3. The circumferential locking device according to claim 2, characterized in that: The first body part (8) is further provided with a first stop hole (6), the extension direction of the first stop hole (6) is perpendicular to the extension direction of the first blind hole groove (5), and the pin (15) is held in the first blind hole groove (5) and the second blind hole groove through the first stop hole (6); and / or the second body part (19) is further provided with a second stop hole (20), the extension direction of the second stop hole (20) is perpendicular to the extension direction of the second blind hole groove, and the pin (15) is held in the first blind hole groove (5) and the second blind hole groove through the second stop hole (20).

4. The circumferential locking device according to claim 3, characterized in that: The first body part (8) is L-shaped. The long side of the first body part (8) is installed along the radial direction of the wheel groove. The first blind hole groove (5) and the first stop hole (6) are opened on the long side. The short side of the first body part (8) is provided with a first half hole. The second body part (19) is symmetrically arranged with the first body part (8). The short side of the second body part (19) is provided with a second half hole. The first half hole and the second half hole are adjacent to form a complete positioning cylindrical surface (7). The positioning cylindrical surface (7) can accommodate the locking rod (16).

5. The circumferential locking device according to claim 4, characterized in that: The locking rod (16) includes an anti-rotation part, a locking tongue part and a positioning cylinder (14). The anti-rotation part is provided with a pin hole (11), which can accommodate the pin (15). The locking rod (16) interacts with the front separating block (13) and the rear separating block (2) through the locking tongue part.

6. The circumferential locking device according to claim 5, characterized in that: The front separation block (13) and the rear separation block (2) are provided with a track groove (1) and a stepped surface (3), the track groove (1) accommodating the locking tongue; the locking tongue includes a smooth inclined surface (12), in the locked state, the smooth inclined surface (12) interacts with the stepped surface (3) to lock.

7. The circumferential locking device according to claim 6, characterized in that: The front separating block (13) is provided with a first spring groove (4), and a first spring is installed in the first spring groove (4). The first spring causes the first tenon to be in close contact with the corresponding surface of the wheel groove. The rear separating block (2) is provided with a second spring groove, and a second spring is installed in the second spring groove. The second spring causes the second tenon to be in close contact with the corresponding surface of the wheel groove.

8. The circumferential locking device according to claim 7, characterized in that: The front separating block (13) is provided with a first step (17), and the rear separating block (2) is provided with a second step (18). The first step (17) and the second step (18) are joined together to form a bearing surface, and the middle block (10) is placed on the bearing surface.

9. The circumferential locking device according to claim 8, characterized in that: The cross-section of the pin (15) is one or more of the following: trapezoidal, dovetail, and triangular.

10. The circumferential locking device according to claim 9, characterized in that: The cross-sections of the first blind hole groove (5) and the second blind hole groove correspond to the pin (15) and are one or more of trapezoidal, dovetail, and triangular shapes.

Images