Moving blade and rotor impeller locking device and locking method

Abstract

The invention provides a moving blade and rotor impeller locking device and a locking method, the moving blade and rotor impeller locking device comprises a rotor impeller, a plurality of mounting grooves are formed in the outer circumference of the rotor impeller, and locking through holes are formed in the bottoms of the mounting grooves; the last-stage moving blade comprises a blade profile part, a middle body part and a blade root part, the blade profile part is sequentially connected with the middle body part and the blade root part, and the blade root part is arranged in the mounting groove; the locking part comprises locking pieces and a locking column, the locking pieces are arranged at the two ends of the locking column, and the locking column is arranged in the locking through hole; the locking part is installed in the installation groove of the rotor impeller, when the locking part is rotated, the locking piece can form rigid blocking on the blade root part in the axial direction of the rotor impeller, the blade root part is prevented from moving in the axial direction, the reliability of axial fixing after the last-stage moving blade is installed is improved, and all the last-stage moving blades can be fixed through the same locking part.

Description

Technical Field

[0001] This application belongs to the field of steam turbine technology, specifically relating to a locking device and locking method for moving blades and rotor impellers. Background Technology

[0002] In the current energy structure, thermal power generation continues to play a crucial role as one of the main methods of electricity production. As the core equipment of a thermal power generation system, the steam turbine's stationary and moving blades in its flow path are key components ensuring the stable operation of the unit, and their safety directly determines the smooth operation capability of the thermal power generating unit. Among these, the last-stage moving blades, due to their longest length, strongest work capacity, and operating environment of a mixture of wet and superheated steam, are particularly vulnerable to water erosion or damage. This can not only lead to a decrease in turbine operating efficiency but also potentially cause serious safety accidents such as blade breakage and rotor runaway, posing a significant threat to equipment safety and personnel lives. The final-stage moving blade consists of three parts: the blade profile, the intermediate body, and the blade root. The blade profile is composed of an inner arc and a back arc to meet aerodynamic requirements. The intermediate body connects the blade profile and the blade root, which can improve the bending stiffness of the blade and adjust the natural frequency. The blade root is responsible for fixing the blade to the impeller or rotor. The fir-shaped blade root has the characteristics of convenient axial assembly and easy replacement. Its safety depends not only on the blade root profile design, but also on the reliability of the moving blade locking device.

[0003] The complete locking of the final stage moving blades at the leaf root of a conventional fir tree requires the coordinated action of axial locating pins, the first blade, the moving blade, the final blade, and the final stage locating pins. Except for the final blade, all blades are axially fixed using axial locating pins: during installation, the first blade and axial locating pins are fixed first, and then axial locating pins are installed for each subsequent moving blade. Since the final blade lacks space for axial locating pins, its axial fixation is ultimately handled solely by the final stage locating pins.

[0004] After the blades are installed, due to the design and machining tolerances of the blade root and rotor impeller mounting slot, although adjacent moving blades are closely arranged when they are in a low position (smaller radius) along the radial direction, the working surface of the blade root and the mounting slot is not completely in contact, and there is a certain gap. When the turbine is running, the centrifugal force generated by the high-speed rotation of the rotor causes the blade root to come into close contact with the working surface of the mounting slot, and the blades are in a high position (larger radius) along the radial direction. At this time, gaps are generated between adjacent blades, which leads to a decrease in the bending stiffness and vibration frequency of the entire blade ring, directly affecting the safe and stable operation of the last-stage moving blades. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] To address the aforementioned problems, the first aspect of this application provides a locking device for a moving blade and a rotor impeller, comprising:

[0007] The rotor impeller has several mounting grooves on its outer circumference, and a locking through hole is provided at the bottom of the mounting groove;

[0008] The last-stage moving blade includes a blade-shaped portion, an intermediate body portion, and a blade root portion, wherein the blade-shaped portion is sequentially connected to the intermediate body portion and the blade root portion, and the blade root portion is disposed within the mounting groove.

[0009] The locking part includes a locking member and a locking pin. The locking member is disposed at both ends of the locking pin, and the locking pin is disposed in the locking through hole. When the locking member faces the rotor impeller shaft, the blade root can be installed into the mounting groove. When the locking member faces the outer edge of the rotor impeller, the locking member can limit the blade root installed in the mounting groove along the axial direction of the rotor impeller.

[0010] Optionally, the length of the locking pin is 'a', the axial width of the mounting groove is 'b', the length of the locking pin 'a' is the same as the axial width of the mounting groove 'b', and the locking element is located on both sides of the mounting groove.

[0011] Optionally, the locking element has a semi-circular arc structure.

[0012] Optionally, the locking pin is an arc-shaped column structure.

[0013] Optionally, the diameter of the locking pin is smaller than the diameter of the locking through hole.

[0014] Optionally, the diameter of the locking pin is c, and the diameter of the locking through hole is d, where c = 0.9d.

[0015] Optionally, the bending height of the locking pin is greater than the radial height of the locking through hole.

[0016] Optionally, the bending height of the locking pin is e, and the radial height of the locking through hole is f, where e = 1.3-1.5f.

[0017] Optionally, the locking pin and the locking element are an integral structure.

[0018] A second aspect of this application also provides a locking method for a locking device between a moving blade and a rotor impeller, comprising:

[0019] S1. A locking member is installed in the mounting groove of each rotor impeller. The locking pin is located in the locking through hole. The locking member is rotated so that the arc-shaped side of the locking member faces the rotor impeller axis and the arc apex of the middle part of the locking pin faces the outer edge of the rotor impeller.

[0020] S2. Insert the last stage moving blade into the mounting groove. After aligning the blade root with the mounting groove, push the blade root into the mounting groove to complete the installation of the last stage moving blade. In this state, the arc top of the middle part of the locking column can support the blade root, so that the contact surface between the blade root and the mounting groove forms a gapless contact. Then, install the last stage moving blades into the mounting groove in sequence, and keep the last stage moving blades closely arranged in pairs.

[0021] S3. Lock the last stage moving blade, rotate the locking member 180°, and rotate the arc side of the locking member to face the outer edge of the rotor impeller. The locking member can limit and fix the blade root from the axial direction of the rotor impeller, and the two ends of the locking column can support the blade root, so that the contact surface between the blade root and the mounting groove forms a gapless contact, and the locking member is fixed to the rotor impeller by punching and riveting.

[0022] Beneficial effects

[0023] The embodiments of the present invention provide a locking device and method for locking moving blades and rotor impellers. By installing a locking part in the mounting groove of the rotor impeller, when the locking part is rotated, the locking part can form a rigid block on the blade root along the axial direction of the rotor impeller, preventing the blade root from moving axially. This improves the reliability of axial fixation of the last-stage moving blades after installation. It eliminates the need for a special positioning component designed separately for the last-stage moving blades, and all last-stage moving blades can be fixed using the same locking part, reducing the types of parts and assembly steps, improving installation efficiency. Simultaneously, it provides a locking device and method for locking moving blades and rotor impellers. During blade installation and after the locking mechanism rotates, the locking pins can push the root of the fir-shaped blade to form a gapless contact with the mounting groove, eliminating gaps caused by design and manufacturing tolerances. At this time, adjacent last-stage moving blades can be closely arranged, ensuring that the root of all last-stage moving blades and the mounting groove of the rotor impeller are in a tight assembly state, whether the turbine is in the installation state or the operating state. This improves the overall rigidity and vibration resistance of the last-stage moving blades, ensuring that the installation position of the last-stage moving blades is the working position, and ensuring the safe and stable operation of the turbine. Attached Figure Description

[0024] Figure 1 This is a structural diagram of the present invention;

[0025] Figure 2 This is a structural diagram of the locking part of the present invention mounted on the rotor impeller;

[0026] Figure 3 This is a structural diagram of the locking part of the present invention;

[0027] Figure 4 This is a structural diagram of the mounting groove of the present invention;

[0028] Figure 5 This is a three-dimensional structural diagram of the rotor impeller of the present invention.

[0029] The reference numerals in the attached figures are as follows:

[0030] 1. Rotor impeller; 2. Mounting groove; 3. Locking through hole; 4. Last stage moving blade; 41. Airfoil section; 42. Intermediate body section; 43. Blade root section; 5. Locking part; 51. Locking element; 52. Locking pin. Detailed Implementation

[0031] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the 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.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 mechanical connection or an electrical 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 invention according to the specific circumstances.

[0034] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0035] See also Figure 1-5 As shown, according to a first aspect of an embodiment of this application, a locking device for a moving blade and a rotor impeller is provided, comprising:

[0036] The rotor impeller 1 has several mounting grooves 2 on its outer circumference, and a locking through hole 3 is provided at the bottom of the mounting groove 2.

[0037] The final stage moving blade 4 includes a blade-shaped portion 41, an intermediate body portion 42, and a blade root portion 43. The blade-shaped portion 41 is connected to the intermediate body portion 42 and the blade root portion 43 in sequence, and the blade root portion 43 is disposed in the mounting groove 2.

[0038] The locking part 5 includes a locking member 51 and a locking pin 52. The locking member 51 is disposed at both ends of the locking pin 52, and the locking pin 52 is disposed in the locking through hole 3. When the locking member 51 is facing the axis of the rotor impeller 1, the blade root 43 can be installed into the mounting groove 2. When the locking member 51 is facing the outer edge of the rotor impeller 1, the locking member 51 can limit the blade root 43 installed in the mounting groove 2 along the axial direction of the rotor impeller 1.

[0039] Specifically, the rotor impeller 1 provides assembly space for the final stage moving blade 4 through the mounting groove 2 opened on the outer circumference. The toothed structure of the mounting groove 2 is adapted to the fir-shaped blade root 43 of the final stage moving blade 4, realizing the initial radial positioning of the blade. The locking through hole 3 at the bottom of the mounting groove 2 provides installation space for the locking part 5. After the locking part 5 is installed in the locking through hole 3, the locking pin 52 can rotate flexibly in the locking through hole 3. The radius of the locking part 51 is larger than the radius of the locking through hole 3, and the locking part 51 is located on both sides of the top and bottom of the rotor impeller 1. When the locking part 5 is rotated, the locking part 51 can limit the axial displacement of the final stage moving blade 4 installed in the mounting groove 2.

[0040] The final stage moving blade 4 includes an airfoil portion 41, an intermediate body portion 42, and a blade root portion 43. When the blade root portion 43 is installed into the mounting groove 2, the locking member 51 is in its initial state facing the axis of the rotor impeller 1. In this state, the locking member 51 does not obstruct the insertion of the blade root portion 43, and the blade root portion 43 can be smoothly installed into the mounting groove 2. After the blade root portion 43 is fully installed, the locking member 5 is rotated to rotate the locking member 51 from facing the axis to facing the outer edge of the rotor impeller 1. At this time, the locking member 51 can form a rigid block on the blade root portion 43 installed in the mounting groove 2 along the axial direction of the rotor impeller 1, preventing the blade root portion 43 from moving axially. This improves the reliability of the axial fixation of the final stage moving blade 4 after installation. There is no need to design a special positioning part for the final stage moving blade 4. All final stage moving blades 4 can be fixed using the same locking member 5, reducing the types of parts and assembly steps, and improving installation efficiency.

[0041] The size of the locking part 5 can be adjusted according to the specifications of the rotor impeller 1 and the final stage moving blade 4. The rotation angle and limiting method of the locking part 51 can be flexibly adapted to different rotor impeller 1 structures, and it has high versatility.

[0042] See also Figure 1 , Figure 3 and Figure 5 As shown, the length of the locking pin 52 is a, the axial width of the mounting groove 2 is b, the length of the locking pin 52 is a and the axial width of the mounting groove 2 is b, and the locking member 51 is located on both sides of the mounting groove 2.

[0043] Specifically, the length of the locking pin 52 is the same as the axial width of the mounting groove 2. Therefore, when the locking pin 52 is installed into the locking through hole 3, the locking parts 51 can be symmetrically distributed on both sides of the mounting groove 2 to form synchronous limiting on both sides. When the root part 43 of the last stage moving blade 4 is installed into the mounting groove 2, the locking pin 52 is consistent with the axial width of the mounting groove 2, and the locking parts 51 at both ends are located on the outside of the last stage moving blade 4. Rotating the locking part 5 makes the locking parts 51 on both sides rotate synchronously to face the outer edge of the rotor impeller 1. At this time, the locking parts 51 on both sides can limit the axial movement of the root part 43, ensuring that the root part 43 does not move along the axial direction.

[0044] See also Figure 1 , Figure 2 and Figure 3 As shown, the locking member 51 has a semi-circular arc structure.

[0045] Specifically, when the locking member 51 is in its initial state, its arc-shaped side faces the axis of the rotor impeller 1. At this time, the locking member 51 does not obstruct the blade root 43 from being inserted into the mounting groove 2, ensuring that the blade root 43 can be smoothly pushed into the mounting groove 2. After the blade root 43 is installed in place, the locking part 5 is rotated to rotate the arc-shaped side of the locking member 51 to face the outer edge of the rotor impeller 1. At this time, the arc-shaped side of the locking member 51 will face the outer edge of the rotor impeller 1, which can obstruct the blade root 43 inserted into the mounting groove 2, thereby limiting and fixing it and preventing the blade root 43 from axially moving during use.

[0046] See also Figure 1 , Figure 2 and Figure 3 As shown, the locking post 52 is an arc-shaped column structure.

[0047] Specifically, the locking pin 52 is an arc-shaped column structure. The arc apex of the middle part of the locking pin 52 is opposite to the arc side of the locking member 51. When the blade root 43 of the last stage moving blade 4 is installed into the mounting groove 2, the bottom plane of the blade root 43 contacts the arc apex of the middle part of the locking pin 52, forcing the locking pin 52 to produce a slight elastic deformation. The two ends of the locking pin 52 extend slightly outward due to the force, while the arc apex of the middle part maintains the upward support force on the blade root 43. The reaction force generated by this deformation acts on the bottom of the blade root 43, pushing the fir tree-shaped blade root 43 and the mounting groove 2 to form a gapless contact, eliminating the gap caused by design and processing tolerances. At this time, the adjacent last stage moving blades 4 can be closely arranged. After the last-stage moving blade 4 is installed, when the locking part 5 is rotated 180°, the middle arc top of the locking column 52 will contact the bottom of the locking through hole 3. At this time, the two ends of the locking column 52 maintain an upward supporting force on the blade root 43, and the blade root 43 still maintains a gapless contact with the contact surface between the blade root and the mounting groove 2. This eliminates the gaps caused by design and machining tolerances, ensuring that the blade root 43 of all last-stage moving blades 4 and the mounting groove 2 of the rotor impeller 1 are in a tight assembly state, whether the turbine is in the installed state or the operating state. This improves the overall rigidity and vibration resistance of the last-stage moving blade 4, ensuring that the installation position of the last-stage moving blade 4 is the working position, and ensuring the safe and stable operation of the turbine.

[0048] See also Figure 3 , Figure 4 As shown, the diameter of the locking pin 52 is smaller than the diameter of the locking through hole 3.

[0049] The diameter of the locking pin 52 is c, and the diameter of the locking through hole 3 is d, where c = 0.9d.

[0050] Specifically, when the locking part 5 is installed in the locking through hole 3, the diameter difference between the locking through hole 3 and the locking pin 52 creates an annular gap between the locking pin 52 and the inner wall of the locking through hole 3, ensuring that the locking pin 52 has sufficient rotational margin in the locking through hole 3 and avoiding the problem of the locking pin 52 getting stuck due to the gap being too small.

[0051] See also Figure 3 , Figure 4 As shown, the bending height of the locking pin 52 is greater than the radial height of the locking through hole 3.

[0052] The bending height of the locking pin 52 is e, and the radial height of the locking through hole 3 is f, where e = 1.3-1.5f.

[0053] Specifically, when the locking part 5 is installed into the locking through hole 3, since the bending height of the locking pin 52 is greater than the radial height of the locking through hole 3, the central arc top of the locking pin 52 will naturally protrude outward from the locking through hole 3. The central arc top of the locking pin 52 exceeds the radial range of the locking through hole 3. When the blade root 43 of the last stage moving blade 4 is installed into the mounting groove 2, the bottom of the blade root 43 will press against the arc top of the locking pin 52, causing the locking pin 52 to undergo elastic deformation. During the deformation process, an upward reaction force is generated, which acts on the blade root 43, pushing the contact surface between the fir tree-shaped blade root and the mounting groove 2 to form a gapless contact, completely eliminating the gap caused by design and processing tolerances. Furthermore, after the last-stage moving blade 4 is installed, when the locking part 5 is rotated 180°, the central arc apex of the locking pin 52 will contact the locking through hole 3. At this time, both ends of the locking pin 52 maintain an upward supporting force on the blade root 43, and the blade root 43 can still form a gapless contact with the contact surface between the mounting groove 2, eliminating the gap caused by design and machining tolerances. This ensures that whether the turbine is in the installation state or the running state, all the last-stage moving blades 4 and the rotor impeller 1 mounting groove 2 are in a tight assembly state, which improves the overall rigidity and vibration resistance of the last-stage moving blades 4, ensures that the installation position of the last-stage moving blades 4 is the working position, and ensures the safe and stable operation of the turbine.

[0054] See also Figure 3 As shown, the locking pin 52 and the locking member 51 are an integral structure.

[0055] Specifically, the locking pin 52 and the locking component 51 are welded together as a single structure to improve its structural strength and rigidity.

[0056] A second aspect of this application provides a locking method for a locking device between a moving blade and a rotor impeller, comprising:

[0057] S1. A locking member 51 is installed in the mounting groove 2 of each rotor impeller 1. The locking pin 52 is located in the locking through hole 3. The locking member 51 is rotated so that the arc side of the locking member 51 faces the axis of the rotor impeller 1 and the arc top of the middle part of the locking pin 52 faces the outer edge of the rotor impeller 1.

[0058] Specifically, in the initial stage of assembly, a locking element 51 is first installed in each locking through hole 3. At the same time, the locking element 51 is rotated so that the arc side faces the axis of the rotor impeller 1. At this time, the arc apex of the middle part of the locking pin 52 naturally faces the outer edge of the rotor impeller 1. Since the bending height of the locking pin 52 is greater than the radial height of the locking through hole 3, the arc apex of the middle part of the locking element 51 protrudes into the mounting groove 2, exceeding the radial range of the locking through hole 3. Moreover, at this time, the locking element 51 will not hinder the installation of the last stage moving blade 4, and the last stage moving blade 4 can be installed.

[0059] S2. Insert the last stage moving blade 4 into the mounting groove 2. Align the blade root 43 with the mounting groove 2 and push the blade root 43 into the mounting groove 2 to complete the installation of the last stage moving blade 4. In this state, the arc top of the middle part of the locking post 52 can support the blade root 43, so that the contact surface between the blade root 43 and the mounting groove 2 forms a gapless contact. Then, install the last stage moving blade 4 into the mounting groove 2 in sequence, and keep the last stage moving blade 4 closely arranged between each other.

[0060] Specifically, when installing the last-stage moving blade 4, first align the blade root 43 with the mounting groove 2, and push the blade root 43 to install the last-stage moving blade 4 into the mounting groove 2. During the installation process, the bottom of the blade root 43 of the locking column 52 will first contact the arc top in the middle of the locking column 52. The arc top in the middle of the locking column 52 will generate an upward reaction force, pushing the fir tree-shaped tooth surface of the blade root 43 to fit tightly against the inner wall of the mounting groove 2, eliminating tolerance gaps. The last-stage moving blade 4 is then installed into the mounting groove 2 of the rotor impeller 1 in sequence. All last-stage moving blades 4 and mounting grooves 2 are in a tight assembly state, which improves the overall rigidity and vibration resistance of the last-stage moving blade 4 and ensures the safe and stable operation of the steam turbine.

[0061] S3. Lock the last stage moving blade 4, rotate the locking member 51 180°, and rotate the arc side of the locking member 51 to face the outer edge of the rotor impeller 1. The locking member 51 can limit and fix the blade root 43 from the axial direction of the rotor impeller 1, and the two ends of the locking pin 52 can support the blade root 43, so that the contact surface between the blade root 43 and the mounting groove 2 forms a gapless contact, and the locking member 51 is fixed to the rotor impeller 1 by punching and riveting.

[0062] Specifically, after the final stage moving blade 4 is installed, the locking part 5 is rotated 180° using a tool. At this time, the arc-shaped side of the locking part 51 rotates from facing the axis of the rotor impeller 1 to facing the outer edge of the rotor impeller 1. The locking part 51 can form a rigid block on the blade root 43 installed in the mounting groove 2 along the axial direction of the rotor impeller 1, preventing the blade root 43 from moving axially. Furthermore, when the locking part 5 is rotated, the central arc apex of the locking pin 52 will contact the bottom of the locking through hole 3, and both ends of the locking pin 52 will contact the blade root 43, maintaining the upward support force on the blade root 43. This ensures that the contact surface between the blade root 43 and the mounting groove 2 forms a gapless contact, eliminating gaps caused by design and machining tolerances. This ensures that all last-stage moving blades 4 and the rotor impeller 1 mounting groove 2 are in a tight assembly state, whether the turbine is in the installation state or the operating state. This improves the overall rigidity and vibration resistance of the last-stage moving blades 4, ensuring that the installation position of the last-stage moving blades 4 is the working position, and ensuring the safe and stable operation of the turbine. At this time, the locking part 51 and the side of the rotor impeller 1 are riveted to prevent loosening, achieving a stable connection.

[0063] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A locking device for a moving blade and a rotor impeller, characterized in that, include: The rotor impeller (1) has several mounting grooves (2) on its outer circumference, and a locking through hole (3) is provided at the bottom of the mounting groove (2). The final stage moving blade (4) includes a blade-shaped part (41), an intermediate body part (42) and a blade root part (43). The blade-shaped part (41) is connected to the intermediate body part (42) and the blade root part (43) in sequence. The blade root part (43) is disposed in the mounting groove (2). The locking part (5) includes a locking member (51) and a locking post (52). The locking member (51) is disposed at both ends of the locking post (52). The locking post (52) is disposed in the locking through hole (3). When the locking member (51) faces the axis of the rotor impeller (1), the blade root (43) can be installed in the mounting groove (2). When the locking member (51) faces the outer edge of the rotor impeller (1), the locking member (51) can limit the blade root (43) installed in the mounting groove (2) along the axial direction of the rotor impeller (1).

2. The locking device for the moving blade and rotor impeller according to claim 1, characterized in that, The length of the locking pin (52) is a, the axial width of the mounting groove (2) is b, the length of the locking pin (52) is the same as the axial width of the mounting groove (2) is b, and the locking element (51) is located on both sides of the mounting groove (2).

3. The locking device for the moving blade and rotor impeller according to claim 2, characterized in that, The locking element (51) has a semi-circular arc structure.

4. The locking device between the moving blade and the rotor impeller according to claim 1, characterized in that, The locking post (52) is an arc-shaped column structure.

5. The locking device between the moving blade and the rotor impeller according to claim 4, characterized in that, The diameter of the locking pin (52) is smaller than the diameter of the locking through hole (3).

6. The locking device for the moving blade and the rotor impeller according to claim 5, characterized in that, The diameter of the locking pin (52) is c, and the diameter of the locking through hole (3) is d, where c = 0.9d.

7. The locking device for the moving blade and the rotor impeller according to claim 4, characterized in that, The bending height of the locking pin (52) is greater than the radial height of the locking through hole (3).

8. The locking device for the moving blade and the rotor impeller according to claim 7, characterized in that, The bending height of the locking pin (52) is e, and the radial height of the locking through hole (3) is f, where e = 1.3-1.5f.

9. The locking device for the moving blade and the rotor impeller according to claim 1, characterized in that, The locking pin (52) and the locking element (51) are an integral structure.

10. A locking method for the locking device between the moving blade and the rotor impeller as described in any one of claims 1-9, characterized in that, include: S1. A locking member (51) is installed in the mounting groove (2) of each rotor impeller (1). The locking member (51) is located in the locking through hole (3). The locking member (51) is rotated so that the arc side of the locking member (51) faces the axis of the rotor impeller (1) and the arc top of the middle part of the locking post (52) faces the outer edge of the rotor impeller (1). S2. Insert the last stage moving blade (4) into the mounting groove (2), align the blade root (43) with the mounting groove (2), and push the blade root (43) into the mounting groove (2) to complete the installation of the last stage moving blade (4). In this state, the arc top of the middle part of the locking column (52) can support the blade root (43), so that the blade root (43) and the mounting groove (2) form a gapless contact. Then, install the last stage moving blade (4) into the mounting groove (2) in sequence, and keep the last stage moving blades (4) closely arranged in pairs. S3. Lock the last stage moving blade (4), rotate the locking member (51) 180°, and rotate the arc side of the locking member (51) to face the outer edge of the rotor impeller (1). The locking member (51) can limit and fix the blade root (43) from the axial direction of the rotor impeller (1), and the two ends of the locking column (52) can support the blade root (43), so that the blade root (43) and the mounting groove (2) form a gapless contact, and the locking member (51) and the rotor impeller (1) are fixed by punching and riveting.

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