Axial locking device for compressor blades

Abstract

The present invention provides an axial locking assembly for compressor blades, wherein the blade root of the blade (1) is mounted in a tenon groove (3) of a wheel disc (2), and the locking assembly comprises a first mounting portion, a second mounting portion, and an interlocking device. The first mounting portion is arranged on the blade root, and the second mounting portion is arranged in the tenon groove (3). The locking assembly further comprises an interlocking device, wherein the interlocking device can be pre-installed in the first mounting portion, and the blade root pre-installed with the interlocking device is installed in the tenon groove (3). The interlocking device comprises an unlocked state and a locked state, and the interlocking device can be operated axially to switch between the unlocked state and the locked state. In the locked state, the interlocking device is partially locked in the second mounting portion to limit the axial displacement of the blade root end face of the blade (1) and the wheel disc (2). The axial locking assembly of the present invention does not require any parts to be destroyed when dismantled, adopts the form of elastic deformation, does not generate plastic deformation, and does not drop foreign matter into the flow channel.

Description

Technical Field

[0001] The present invention relates to a gas turbine, and in particular to an axial locking device for compressor blades. Background Art

[0002] The compressor of a gas turbine consists of rows of moving blades and stator blades, and is one of the core components of the gas turbine. The moving blade rows are mounted on the rotor or disk. The roots of moving blades are generally mounted axially or circumferentially. This invention relates to the axial mounting of compressor moving blade roots. After the moving blade roots are installed in the disk groove, their circumferential and radial movement are restricted, but they still need to be locked in the axial direction.

[0003] The existing solution involves simultaneously slotting the blade root and the disc. Identical locking strips are then inserted circumferentially through the disc, with the excess strip inserted into the slots at the blade root. A special-shaped locking strip is then inserted circumferentially around the last blade, and the final strip is squeezed to plastically deform, achieving circumferential tightening of the strip. Some of these existing technical solutions have been implemented in some gas turbines, but they also have certain drawbacks.

[0004] Since all locking strips rely only on the locking strip of the last moving blade to achieve circumferential locking, several problems will be encountered when the moving blade needs to be replaced: 1. No matter which moving blade is disassembled or assembled, it is necessary to start from the locking strip of the last moving blade, and fixed-point replacement of the blade to be disassembled cannot be achieved; 2. Since the locking strip of the last moving blade needs to undergo plastic deformation during assembly, there is a risk of foreign matter falling into the flow channel during operation; 3. The locking strip of the last moving blade needs to be destroyed when it is disassembled, which increases the workload and cost; 4. The locking strip of the last moving blade is exposed on the surface of the flow channel and is of irregular shape, which causes certain damage to the integrity of the flow channel and affects the stability of the airflow and aerodynamic efficiency.

[0005] In view of the above problems, the present invention provides a solution. Summary of the Invention

[0006] The main purpose of the present invention is to provide an axial locking structure that does not destroy the integrity of the flow channel surface, so as to solve the problems in the prior art.

[0007] To achieve the above-mentioned purpose, according to one aspect of the present invention, a compressor blade axial locking assembly is provided, wherein the blade root is mounted in the tenon groove of the wheel disc, and the locking assembly includes a first mounting portion, a second mounting portion, and an interlocking device. The first mounting portion is arranged on the blade root, and the second mounting portion is arranged in the tenon groove. The interlocking device is also included. The interlocking device can be pre-installed in the first mounting portion, and the blade root pre-installed with the interlocking device is installed in the tenon groove. The interlocking device includes an unlocked state and a locked state. The interlocking device can be operated axially between the unlocked state and the locked state. In the locked state, the interlocking device is partially locked in the second mounting portion to limit the axial displacement of the blade root end face of the wheel disc. The axial locking assembly of the present invention does not require the destruction of any parts when dismantled. It adopts the form of elastic deformation, does not produce plastic deformation, and will not drop foreign matter into the flow channel.

[0008] Furthermore, the first mounting portion is configured as a slot recessed downward from the blade root end surface. In the locked state, the top surface of the interlocking device is flush with the blade root end surface.

[0009] Furthermore, the first mounting portion is shaped so as to provide a primary anti-rotation function for the interlocking device, and the second mounting portion is shaped so as to provide a secondary anti-rotation function for the interlocking device together with the first mounting portion.

[0010] Furthermore, the interlocking device includes an interlocking body and an elastic portion, and the interlocking body can be switched between an unlocked state and a locked state by the elastic portion.

[0011] Furthermore, the elastic portion is mounted on the interlocking body, and the elastic portion includes a first end surface and a second end surface, the first end surface is in contact with the first mounting portion, and the second end surface provides a supporting force to the interlocking body.

[0012] Furthermore, the interlocking body includes a lock head and a lock rod. The lock rod is located at the lower side of the lock head. The lock rod is used to install the elastic part. In the locked state, the top surface of the lock head is flush with the blade root end surface under the action of the elastic part.

[0013] Furthermore, the lock head is provided with an annular surface for mounting the second end surface of the elastic portion.

[0014] Furthermore, the elastic part is a compression spring.

[0015] Furthermore, the locking rod includes a sliding rod and a stop end, wherein the stop end is located at the lower side of the sliding rod, and the stop end at least partially extends into the second mounting portion in the locked state to limit the axial displacement of the blade and the wheel.

[0016] Furthermore, the locking rod is L-shaped.

[0017] Furthermore, the first mounting portion includes: a lock head accommodating groove, a lock head accommodating groove for accommodating the lock head, a first lock head track groove and a first lock rod track groove; the lock head accommodating groove penetrates the blade root end face, and the first lock head track groove connects the lock head accommodating groove and the first lock rod track groove.

[0018] Furthermore, the second mounting portion includes a second lock head track groove and a second lock rod track groove. The second lock rod track groove and the second lock head track groove are separate and unconnected spaces. The second lock head track groove cooperates with the first lock head track groove to form a lock head track space for the lock head to switch between the unlocked state and the locked state; the second lock rod track groove cooperates with the first lock rod track groove to form a lock rod track space for the lock rod to switch between the unlocked state and the locked state.

[0019] Furthermore, the cross section of the first lock track groove and / or the second lock track groove is semicircular.

[0020] Furthermore, the first locking rod trajectory groove includes a first vertical section and a first horizontal section. The first vertical section accommodates the sliding rod, and the first horizontal section accommodates the stop end. The stop end can move up and down along the vertical direction in the first horizontal section.

[0021] Furthermore, the interlocking device also includes an adjustment state. In the adjustment state, the compression spring is compressed and deformed, and the lock head is accommodated in the lock head track space; the lock rod is accommodated in the lock rod track space.

[0022] Furthermore, the second locking rod trajectory groove includes a second vertical section and a second horizontal section, the second horizontal section accommodates the stop end in the adjustment state, and the second vertical section accommodates the stop end in the locking state.

[0023] Furthermore, the second vertical section limits the radial displacement of the interlocking body, so that the top surface of the locking head is flush with the end surface of the blade root in the locked state.

[0024] Furthermore, a process hole is provided on the lock head, through which the interlocking device can be rotated.

[0025] Furthermore, the cross section of the lock head is square to ensure that the side surface of the lock head fits closely with the side surface of the lock head receiving groove, eliminating the gap between the lock head and the receiving groove to ensure the integrity of the blade flow path surface.

[0026] Furthermore, the lock head receiving groove is rectangular, including a long side and a short side. The long side extends along the axial direction of the wheel disc. The length of the long side is consistent with the side length of the lock head. The gap value between the blade edge and the wheel disc in the circumferential direction is C, the length of the long side is A, and the length of the short side is B=AC.

[0027] The technical solution of the present invention is an axial locking assembly that can ensure the integrity of the flow channel and does not affect the blade and disc flow channel. The above-mentioned axial locking assembly is easy to adjust, has a good anti-rotation effect, is independent of each other, and the disassembly and assembly of each level of blades are not dependent on each other; the axial locking assembly does not need to destroy any parts when dismantling, adopts the form of elastic deformation, does not produce plastic deformation, and will not drop foreign matter into the flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It shows the axial positioning assembly diagram of the blades and the wheel disc according to the present invention;

[0030] Figure 2 A schematic diagram showing the positions of the blades and the locking device in a locked state according to the present invention is shown;

[0031] Figure 3 A three-dimensional schematic diagram of the blade and the locking device in a locked state according to the present invention is shown;

[0032] Figure 4 It shows a schematic structural diagram of the interlocking body according to the present invention;

[0033] Figure 5 Another structural schematic diagram of the interlocking body according to the present invention is shown;

[0034] Figure 6 It shows a schematic structural diagram of the first mounting portion according to the present invention;

[0035] Figure 7 It shows a schematic structural diagram of the second mounting portion according to the present invention;

[0036] Figure 8 It shows a schematic structural diagram of the elastic locking assembly in an upward unlocked state according to the present invention;

[0037] Figure 9 A schematic diagram of the adjustment state of the locking device according to the present invention is shown.

[0038] The above drawings include the following reference numerals:

[0039] 1. Blade; 11. Blade root end face; 2. Wheel; 3. Tenon groove;

[0040] 4. Interlocking body; 41. Lock head; 411. Annular surface; 412. Process hole; 413. Top surface of lock head; 414. Side surface of lock head; 42. Lock rod; 421. Sliding rod; 422. Stop end;

[0041] 5. Lock head receiving groove; 51. Side of the lock head receiving groove; 6. First lock head track groove; 7. First lock rod track groove; 71. First vertical section; 72. First horizontal section;

[0042] 8. Second lock track groove;

[0043] 9. Second locking rod track groove; 91. Second vertical section; 92. Second horizontal section;

[0044] 10. Compression spring; 12. First end surface; 13. Second end surface;

[0045] Y, vertical direction; A, long side length; B, short side length; C, gap value between the blade edge and the wheel disc. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] The present invention is described in further 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 "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the terms "lateral", "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying 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 specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present invention; in addition, the terms "first", "second", etc. are used to distinguish different objects, rather than to describe a specific order.

[0048] In this description, it should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention. Furthermore, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0049] The compressor of a gas turbine, consisting of moving blades and stationary blades, is one of the core components of the gas turbine. The moving blade rows are mounted on the rotor or disk 2. The blade roots of the blades 1 are generally mounted axially or circumferentially. This invention relates to the axial mounting of the compressor moving blade roots. After the moving blade roots are installed in the disk groove 3, their circumferential and radial movement are restricted, but they still need to be locked in the axial direction.

[0050] like Figures 1-4 As shown, the axial locking assembly for a compressor blade 1 provided by the present invention includes a first mounting portion, a second mounting portion, and an interlocking device. The first mounting portion is disposed on the blade root, and the second mounting portion is disposed within the tenon groove 3. The interlocking device can be pre-installed in the first mounting portion, and the blade root with the pre-installed interlocking device is installed in the tenon groove 3. The interlocking device has an unlocked state and a locked state. The interlocking device can be axially operated to switch between the unlocked and locked states. In the unlocked state, the interlocking device is contained within the first mounting portion and does not affect the axial relative movement between the blade root and the disk 2. In the locked state, the interlocking device is partially locked in the second mounting portion to limit the axial displacement of the blade 1 and the disk 2. The axial displacement of the blade 1 and the disk 2 is limited by limiting the axial freedom of the blade root and the disk 2. To facilitate switching of the interlocking device between the unlocked and locked states, the first mounting portion is designed to penetrate the blade root end surface 11. The interlocking device can be conveniently rotated on the blade root end surface 11 to switch between the unlocked and locked states. When the axial locking device is locked, the top surface of the interlocking device is flush with the blade root end face 11, effectively ensuring the integrity of the flow path surface of the blade 1. Furthermore, the axial locking components of the present invention are independent of each other, and the assembly and disassembly of each stage of the blade 1 are independent of each other. The axial locking components can be removed without destroying any parts, and they are elastically deformed, without plastic deformation, preventing foreign matter from falling into the flow path.

[0051] The interlocking device includes an interlocking body 4 and an elastic part. The interlocking body 4 can be switched between an unlocked state and a locked state by the elastic part, and includes a lock head 41 and a lock rod 42. A process hole 412 is provided on the lock head 41, through which the interlocking device can be rotated, wherein the process hole 412 can be set as a straight groove, and the size of the straight groove is relatively small and basically has no effect on the flow channel. The lock rod 42 is located on the lower side of the lock head 41 and is used to install the elastic part. In the locked state, the top surface of the lock head 41 is flush with the top surface of the blade root under the action of the elastic part. The elastic part of the interlocking device is installed on the interlocking body 4, and includes a first end face 12 and a second end face 13. The first end face 12 is in contact with the first mounting portion of the blade root, and the second end face 13 provides support force to the lock head 41.

[0052] like Figure 5As shown, the lock head 41 is provided with an annular surface 411 for mounting the second end surface 13 of the elastic portion. The elastic portion can be configured as a compression spring 10. The lock rod 42 includes a slide rod 421 and a stop end 422. The stop end 422 is located below the slide rod 421. In the locked state, the stop end 422 at least partially extends into the second mounting portion to limit the axial displacement of the blade 1 and the wheel disc 2. The slide rod 421 and the stop end 422 of the lock rod 42 can form an L-shaped structure.

[0053] For the first installation part, if Figure 6 As shown, the slot is recessed downward from the blade root end face 11 and includes a lock head receiving slot 5 for accommodating the lock head 41, a first lock head track slot 6, and a first lock rod track slot 7. The first lock head track slot 6 has a semicircular cross-section and connects the lock head receiving slot 5 and the first lock rod track slot 7. The lock head receiving slot 5 includes a lock head receiving slot side surface 51 that penetrates the blade root end face 11. The lock head receiving slot 5 can be used to adjust the interlocking device between the unlocked and locked states.

[0054] The first locking rod trajectory groove 7 includes a first vertical section 71 and a first horizontal section 72. The first vertical section 71 accommodates the sliding rod 421 and has a width greater than the diameter of the sliding rod 421 but less than the diameter of the elastic portion. The first horizontal section 72 accommodates the stopper end 422, allowing the stopper end 422 to move up and down along the vertical direction Y therein.

[0055] The lock head receiving slot 5 is rectangular, consisting of a long side and a short side. The long side extends axially along the wheel disc 2, and its length A matches the side length of the lock head 41. The short side is shorter, with a length B. The short side length B plus the clearance C between the edge of the blade 1 and the wheel disc 2 in the circumferential direction equals the long side length A, i.e., the short side length B is B = AC.

[0056] Correspondingly, the cross-section of the lock head 41 is square to ensure that the lock head side 414 fits with the lock head receiving groove side 51, eliminating the gap between the lock head 41 and the receiving groove to ensure the integrity of the flow path surface of the blade 1, and the anti-rotation function of the square lock head 41 can realize the anti-movement function of the interlocking body 4, thereby realizing the reliability of the locking function.

[0057] The shape of the first mounting portion is set so that the first mounting portion provides a primary anti-rotation of the interlocking device, and the shape of the second mounting portion is set so that it can provide a secondary anti-rotation of the interlocking device together with the first mounting portion. Figure 7As shown, the second mounting portion includes a second lock head track groove 8 and a second lock rod track groove 9. The second lock rod track groove 9 and the second lock head track groove 8 are separate, disconnected spaces. The second lock rod track groove 9 includes a second vertical section 91 and a second horizontal section 92. The second horizontal section 92 accommodates the stop end 422 in the adjustment state, while the second vertical section 91 accommodates the stop end 422 in the locked state. The second vertical section 91 limits the radial displacement of the interlock body 4. In the locked state, the lock head top surface 413 is flush with the blade root end surface 11.

[0058] The cross section of the second lock head track groove 8 is semicircular, and cooperates with the first lock head track groove 6 to form a lock head 41 track space for the lock head 41 to switch between the unlocked state and the locked state; the second lock rod track groove 9 cooperates with the first lock rod track groove 7 to form a lock rod 42 track space for the lock rod 42 to switch between the unlocked state and the locked state. The above-mentioned track grooves must ensure that the track is not stuck.

[0059] In addition to the unlocked state and the locked state, the interlocking device also includes an adjustment state. In the adjustment state, the compression spring 10 is compressed and deformed, and the lock head 41 is accommodated in the lock head 41 track space; the lock rod 42 is accommodated in the lock rod 42 track space.

[0060] The assembly sequence of the axial locking assembly of the present invention is:

[0061] First, the compression spring 10 is slid into the interlocking body 4 through the locking rod 42 , and the second end surface 13 of the compression spring 10 is inserted into the annular surface 411 to assemble the interlocking device.

[0062] Second, place the interlocking device as a whole into the first mounting portion, with the interlocking body 4 oriented as shown in the figure. Figure 8-Figure 9 As shown, the first end face 12 of the compression spring 10 contacts the first vertical section 71 of the first locking rod track groove 7 . At this time, the compression spring 10 is slightly compressed, and the stop end 422 hooks the first horizontal section 72 of the first locking rod track groove 7 .

[0063] Third, insert the blade 1 and the axial locking assembly into the second mounting portion to obtain a pre-installed state, i.e., an unlocked state. Figure 8 shown.

[0064] Fourth, through Figure 4The slot in the interlock body 4 is pressed against the interlock body 4, causing the compression elasticity to compress and the interlock body 4 to move downward as a whole, so that the lock head 41 is accommodated in the lock head 41 trajectory space, and the lock rod 42 is accommodated in the lock rod 42 trajectory space. Then the interlock body is rotated 490 degrees and released. At this time, the locking hook moves upward as a whole, so that the square lock head 41 of the locking hook is aligned with the lock head receiving groove 5 in the blade 1, realizing the anti-rotation function. At the same time, the rectangular lock head receiving groove 5 in the blade 1 and the edge of the wheel disc 2 together form the required square, so that the lock head receiving groove side 51 and the lock head side 414 are both fitted without gap, which once again ensures the anti-rotation position. At this time, the stop end 422 penetrates into the second vertical section 91 of the wheel disc 2, which can prevent relative displacement to achieve the axial locking function, and also ensure that the lock head top surface 413 of the interlock body 4 is flush with the blade root end surface 11, thereby ensuring the integrity of the flow channel.

[0065] From the above description, it can be seen that the present invention provides an axial locking assembly that ensures the integrity of the flow channel and does not affect the flow channel of the blades 1 and the disc 2. The above-mentioned axial locking assembly is easy to adjust, has a good anti-rotation effect, is independent of each other, and the disassembly and assembly of each stage of blades 1 are not dependent on each other; the axial locking assembly does not need to destroy any parts when dismantling, adopts the form of elastic deformation, does not produce plastic deformation, and will not drop foreign matter into the flow channel.

[0066] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A compressor blade axial locking assembly, wherein the blade root of the blade (1) is mounted in a mortise (3) of a wheel disc (2), the locking assembly comprising a first mounting portion, a second mounting portion, and an interlocking device, wherein the first mounting portion is arranged on the blade root, and the second mounting portion is arranged in the mortise (3), and the locking assembly is characterized in that: It also includes an interlocking device, which can be pre-installed in the first installation part, and the blade root pre-installed with the interlocking device is installed in the tongue and groove (3), and the interlocking device includes an unlocked state and a locked state. The interlocking device can be operated in the axial direction to switch between the unlocked state and the locked state. In the locked state, the interlocking device is partially locked in the second installation part to limit the axial displacement of the blade root end surface of the blade (1) and the wheel disc (2); The first mounting portion is configured as a slot recessed downward from the blade root end surface (11), and in the locked state, the top surface of the interlocking device is flush with the blade root end surface (11); the shape of the first mounting portion is configured so that the first mounting portion provides a primary anti-rotation function for the interlocking device, and the shape of the second mounting portion is configured so that it can provide a secondary anti-rotation function for the interlocking device together with the first mounting portion; the interlocking device comprises an interlocking body and an elastic portion, and the interlocking body can be switched between the unlocked state and the locked state by the elastic portion; the elastic portion is mounted on the interlocking body (4), and the elastic portion comprises a first end surface and a second end surface, the first end surface is in contact with the first mounting portion, and the second end surface provides a supporting force for the interlocking body (4).

2. The axial locking assembly according to claim 1, characterized in that: The interlocking body (4) comprises a lock head (41) and a lock rod (42). The lock rod (42) is located at the lower side of the lock head (41). The lock rod (42) is used to mount the elastic part. In the locked state, the top surface of the lock head (41) is flush with the blade root end surface (11) under the action of the elastic part.

3. The axial locking assembly according to claim 2, wherein: The lock head (41) is provided with an annular surface (411) for mounting the second end surface of the elastic portion.

4. The axial locking assembly according to claim 3, wherein: The elastic part is a compression spring (10).

5. The axial locking assembly according to claim 4, characterized in that: The locking rod (42) comprises a sliding rod (421) and a stop end (422), wherein the stop end (422) is located at the lower side of the sliding rod (421), and the stop end (422) at least partially extends into the second mounting portion in the locked state to limit the axial displacement of the blade (1) and the wheel disc (2).

6. The axial locking assembly according to claim 5, characterized in that: The locking rod (42) is L-shaped.

7. The axial locking assembly according to claim 6, wherein: The first mounting portion comprises: a lock head receiving groove (5), the lock head receiving groove (5) being used to receive the lock head (41), a first lock head track groove (6) and a first lock rod track groove (7); the lock head receiving groove (5) penetrates the blade root end surface (11), and the first lock head track groove (6) communicates with the lock head receiving groove (5) and the first lock rod track groove (7).

8. The axial locking assembly according to claim 7, wherein: The second mounting portion comprises a second lock head track groove (8) and a second lock rod track groove (9), wherein the second lock rod track groove (9) and the second lock head track groove (8) are separate, non-connected spaces, and the second lock head track groove (8) cooperates with the first lock head track groove (6) to form a lock head (41) track space for the lock head (41) to switch between the unlocked state and the locked state; and the second lock rod track groove (9) cooperates with the first lock rod track groove (7) to form a lock rod (42) track space for the lock rod (42) to switch between the unlocked state and the locked state.

9. The axial locking assembly according to claim 8, characterized in that: The cross section of the first lock track groove (6) and / or the second lock track groove (8) is semicircular.

10. The axial locking assembly according to claim 9, wherein: The first locking rod track groove (7) includes a first vertical section (71) and a first horizontal section (72), wherein the first vertical section (71) accommodates the sliding rod (421), and the first horizontal section (72) accommodates the stop end (422), and the stop end (422) can move up and down in the vertical direction within the first horizontal section (72).

11. The axial locking assembly according to claim 10, wherein: The interlocking device further includes an adjustment state, in which the compression spring (10) is compressed and deformed, and the lock head (41) is accommodated in the lock head (41) track space; the lock rod (42) is accommodated in the lock rod (42) track space.

12. The axial locking assembly according to claim 11, wherein: The second locking rod track groove (9) includes a second vertical section (91) and a second horizontal section (92), the second horizontal section (92) accommodating the stop end (422) in the adjustment state, and the second vertical section (91) accommodating the stop end (422) in the locking state.

13. The axial locking assembly according to claim 12, wherein: The second vertical section (91) limits the radial displacement of the interlocking body (4), so that in the locked state, the top surface (413) of the locking head is flush with the blade root end surface (11).

14. The axial locking assembly according to claim 13, wherein: A process hole (412) is provided on the lock head (41), and the interlocking device can be rotated through the process hole (412).

15. The axial locking assembly according to claim 14, wherein: The cross section of the lock head (41) is square, so as to ensure that the side surface (414) of the lock head fits the side surface (51) of the lock head receiving groove, eliminating the gap between the lock head (41) and the receiving groove to ensure the integrity of the flow path surface of the blade (1).

16. The axial locking assembly according to claim 15, wherein: The lock head receiving groove (5) is rectangular and includes a long side and a short side. The long side extends in the axial direction of the wheel disc (2). The length of the long side is consistent with the length of the side of the lock head (41). The gap value between the edge of the blade (1) and the wheel disc (2) in the circumferential direction is C. The length of the long side is A, and the length of the short side is B=AC.

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