Marine steam turbine rotor field dynamic balance structure

Abstract

The invention discloses an on-site dynamic balance structure of a marine steam turbine rotor, and belongs to the technical field of marine steam turbine rotor dynamic balance adjustment. The technical problem that an existing on-site dynamic balance structure is insufficient in adjusting capacity is solved. The on-site dynamic balance structure comprises a steam turbine rotor, a final-stage wheel disc, a reversing-stage wheel disc, an air cylinder, a final-stage on-site dynamic balance structure body and a reversing-stage on-site dynamic balance structure body. The final-stage wheel disc and the reversing-stage wheel disc are both arranged on a steam turbine rotor in a sleeving mode, and the air cylinder is installed on the outer sides of the final-stage wheel disc and the reversing-stage wheel disc. The final-stage wheel flange is arranged on the outer side of the final-stage wheel face, the final-stage wheel flange is used for installing external final-stage blades, a final-stage factory leaving dynamic balance groove is formed in the end, close to the final-stage wheel flange, of the final-stage wheel face, a final-stage field dynamic balance structure body is arranged on the final-stage wheel face, and the final-stage field dynamic balance structure body is arranged on the inner side of the final-stage factory leaving dynamic balance groove; a final-stage adjusting hole is formed in the cylinder wall of the air cylinder, and the reversing stage and the final stage are arranged. The turbine rotor dynamic balance adjusting device is used for turbine rotor dynamic balance adjustment.

Description

Technical Field

[0001] The invention relates to an on-site dynamic balancing structure for a marine steam turbine rotor, belonging to the technical field of dynamic balancing adjustment of marine steam turbine rotors. Background Art

[0002] When designing a steam turbine rotor, it is generally necessary to ensure that the rotor maintains axisymmetry along the axis of rotation. However, due to reasons such as uneven rotor material and manufacturing and installation errors, the central inertia axis of the assembled rotor slightly deviates from its axis of rotation, resulting in an unbalanced amount. Rotor imbalance is the main source of vibration excitation for rotating machinery. In order to eliminate the influence of rotor imbalance, dynamic balancing grooves are usually designed on the rotor for low-speed or high-speed dynamic balancing of the rotor before leaving the factory to ensure the dynamic balancing accuracy of the rotor. After the steam turbine has been running for a period of time, the dynamic balance of the rotor is destroyed due to factors such as changes in assembly clearance and blade erosion, and on-site dynamic balancing is required, especially for marine steam turbine rotors. Due to their large weight, many operating conditions, frequent starts and stops, and sometimes the need to cross criticality or work near the critical speed for a long time, it is difficult to ensure the degree of damage to the dynamic balance.

[0003] The current on-site dynamic balancing structure is commonly found near the thrust plate or coupling and is easy to operate. However, since the position where the balancing block is applied is close to the rotor axis, the dynamic balancing adjustment capability is limited. Only fine-tuning of the dynamic balance of the rotor can be performed, which cannot meet the on-site dynamic balancing requirements for dynamic balance destruction under long-term operating conditions.

[0004] In summary, the existing on-site dynamic balancing structure has the technical problem of insufficient adjustment capability. Summary of the invention

[0005] The present invention aims to solve the technical problem that the existing on-site dynamic balancing structure has insufficient adjustment ability, and further provides a high-efficiency on-site dynamic balancing structure for a marine steam turbine rotor, which comprises a steam turbine rotor, a final stage wheel disc, a reverse stage wheel disc, a cylinder, a final stage on-site dynamic balancing structure body and a reverse stage on-site dynamic balancing structure body;

[0006] The final stage wheel disc and the reverse stage wheel disc are both mounted on the turbine rotor, and the cylinder is installed outside the final stage wheel disc and the reverse stage wheel disc;

[0007] The final wheel disc includes a final wheel surface and a final wheel rim. The final wheel surface is mounted on the outer side of the turbine rotor. The final wheel rim is arranged on the outer side of the final wheel surface. The final wheel rim is used to install external final blades. A final factory dynamic balancing groove is arranged on the final wheel surface near one end of the final wheel rim. A final on-site dynamic balancing structure body is arranged on the final wheel surface. The final on-site dynamic balancing structure body is arranged on the inner side of the final factory dynamic balancing groove. A final on-site dynamic balancing adjustment hole is opened on the cylinder wall of the cylinder.

[0008] The reverse stage wheel disc comprises a reverse stage wheel surface and a reverse stage wheel rim, the reverse stage wheel surface is mounted on the outer side of the turbine rotor, the reverse stage wheel rim is arranged on the outer side of the reverse stage wheel surface, the reverse stage wheel rim is used to install an external reverse stage blade, a reverse stage factory dynamic balancing groove is arranged on the reverse stage wheel surface near one end of the reverse stage wheel rim, a reverse stage on-site dynamic balancing structure body is arranged on the reverse stage wheel surface, and the reverse stage on-site dynamic balancing structure body is arranged on the inner side of the reverse stage factory dynamic balancing groove; a reverse stage on-site dynamic balancing adjustment hole is opened on the cylinder wall of the cylinder.

[0009] As another improvement of the present invention, the final-stage on-site dynamic balancing structure body includes a final-stage threaded hole and a final-stage adjusting screw. The final-stage threaded hole is arranged on the final-stage wheel surface, and the final-stage adjusting screw is detachably connected to the final-stage wheel surface through the final-stage threaded hole.

[0010] As another improvement of the present invention, the direction of the final-stage on-site dynamic balancing adjustment hole opened on the cylinder wall of the cylinder points to the final-stage threaded hole, and the final-stage on-site dynamic balancing adjustment hole is used to install or remove the final-stage adjusting screw.

[0011] As another improvement of the present invention, the aperture size of the final-stage threaded hole is smaller than the aperture size of the final-stage on-site dynamic balancing adjustment hole.

[0012] As another improvement of the present invention, a plurality of final-stage on-site dynamic balancing structure bodies are arranged along the circumferential direction of the steam turbine rotor.

[0013] As another improvement of the present invention, the reversing stage on-site dynamic balancing structure body includes a reversing stage threaded hole and a reversing stage adjusting screw, wherein the reversing stage threaded hole is arranged on the reversing stage wheel surface, and the reversing stage adjusting screw is detachably connected to the reversing stage wheel surface through the reversing stage threaded hole.

[0014] As another improvement of the present invention, the direction of the reversing stage on-site dynamic balancing adjustment hole opened on the cylinder wall of the cylinder points to the reversing stage threaded hole, and the reversing stage on-site dynamic balancing adjustment hole is used for installing or removing the reversing stage adjusting screw.

[0015] As another improvement of the present invention, the aperture size of the reverse stage threaded hole is smaller than the aperture size of the reverse stage on-site dynamic balancing adjustment hole.

[0016] As another improvement of the present invention, a plurality of reverse stage on-site dynamic balancing structure bodies are arranged along the circumferential direction of the steam turbine rotor.

[0017] As another improvement of the present invention, the final-stage on-site dynamic balancing adjustment hole and the reverse-stage on-site dynamic balancing adjustment hole opened on the cylinder wall of the cylinder are both sealable structures.

[0018] Beneficial effects of the present invention:

[0019] 1. The final stage wheel surface of the present invention is provided with a final stage on-site dynamic balancing structure body, which is arranged on the inner side of the final stage factory dynamic balancing groove; the reverse stage wheel surface is provided with a reverse stage on-site dynamic balancing structure body, which is arranged on the inner side of the reverse stage factory dynamic balancing groove; without affecting the structural strength of the wheel disc and the function of the factory dynamic balancing groove, the final stage on-site dynamic balancing structure body is made as close to the final stage blades and the reverse stage blades as possible in the radial direction, and at the same time, a sealable adjustment hole is designed at the corresponding position of the cylinder, so that the dynamic balance amount can be quickly adjusted without dismantling other structures. Similarly, the reverse stage on-site dynamic balancing structure body is provided. After calculation and testing, the on-site dynamic balancing structure is in a sensitive position for adjusting the imbalance amount, and the balance amount of the rotor can be finely adjusted to achieve a better dynamic balancing effect.

[0020] 2. The present invention achieves the purpose of adjusting the dynamic balance by installing or removing the dynamic balance adjusting screw through the adjustment hole. Since the efficient on-site dynamic balance structure is relatively far away from the axis, adjusting the dynamic balance in this structure will have a very obvious effect, and can be used as the main on-site dynamic balance adjustment method, thereby achieving accurate and rapid adjustment of the dynamic balance of the marine steam turbine rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an on-site dynamic balancing structure of a marine steam turbine rotor of the present invention, the left side is the forward final stage, the right side is the reverse stage, and the arrow represents the steam inlet direction. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the examples of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0023] Specific implementation method 1: Combination Figure 1 The present embodiment is described. The present embodiment is a field dynamic balancing structure of a marine steam turbine rotor 7, which comprises a steam turbine rotor 7, a final stage disc, a reverse stage disc, a cylinder, a final stage field dynamic balancing structure body 3 and a reverse stage field dynamic balancing structure body 5;

[0024] The final stage wheel disc and the reverse stage wheel disc are both mounted on the turbine rotor 7, and the cylinder is mounted on the outer side of the final stage wheel disc and the reverse stage wheel disc;

[0025] The final wheel disc includes a final wheel surface and a final wheel rim. The final wheel surface is sleeved on the outer side of the turbine rotor 7. The final wheel rim is arranged on the outer side of the final wheel surface. The final wheel rim is used to install the external final blades. A final factory dynamic balancing groove 2 is arranged on the final wheel surface near one end of the final wheel rim. A final on-site dynamic balancing structure body 3 is arranged on the final wheel surface. The final on-site dynamic balancing structure body 3 is arranged on the inner side of the final factory dynamic balancing groove 2. A final on-site dynamic balancing adjustment hole 1 is opened on the cylinder wall of the cylinder.

[0026] The reversing stage wheel disc comprises a reversing stage wheel surface and a reversing stage wheel rim, the reversing stage wheel surface is mounted on the outer side of the turbine rotor 7, the reversing stage wheel rim is arranged on the outer side of the reversing stage wheel surface, the reversing stage wheel rim is used to install an external reversing stage blade, a reversing stage factory dynamic balancing groove 4 is arranged on the reversing stage wheel surface near one end of the reversing stage wheel rim, a reversing stage on-site dynamic balancing structure body 5 is arranged on the reversing stage wheel surface, and the reversing stage on-site dynamic balancing structure body 5 is arranged on the inner side of the reversing stage factory dynamic balancing groove 4; a reversing stage on-site dynamic balancing adjustment hole 6 is opened on the cylinder wall of the cylinder.

[0027] The steam turbine rotor in this embodiment has a total length of about 3000mm. When designing the rotor, three balancing grooves are set at the reverse stage disc, the final stage disc and the steam seal disc at the front end of the forward steam turbine for high-speed dynamic balancing of the rotor when it leaves the factory, and on-site dynamic balancing structures are set at the reverse stage disc and the final stage disc of the rotor, evenly distributed along the circumference of the rotor. Both dynamic balancing structures are located on the inner side of the high-speed dynamic balancing groove during the factory test. The diameter of the reverse stage disc is about 1030mm, and the corresponding center diameter of the high-efficiency on-site dynamic balancing structure is about 750mm. The diameter of the final stage disc is about 950mm, and the diameter of the high-efficiency on-site dynamic balancing structure is about 630mm. At the same time, an openable adjustment operation hole is reserved at the corresponding position of the cylinder along the axis direction of the dynamic balancing structure. The dynamic balancing screw is installed and removed through the adjustment hole to achieve the purpose of adjusting the dynamic balancing amount. Since the on-site dynamic balancing structure is relatively far away from the axis, adjusting the dynamic balancing amount in this structure will have a very obvious effect, which can be used as the main on-site dynamic balancing adjustment method, thereby realizing accurate and rapid adjustment of the dynamic balancing of the marine steam turbine rotor.

[0028] Specific implementation method 2: Combination Figure 1 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that the final-stage on-site dynamic balancing structure body 3 includes a final-stage threaded hole and a final-stage adjusting screw. The final-stage threaded hole is set on the final-stage wheel surface, and the final-stage adjusting screw is detachably connected to the final-stage wheel surface through the final-stage threaded hole. The adjusting screw is installed on the final-stage threaded hole through the final-stage on-site dynamic balancing adjustment hole, or the adjusting screw is removed. The function of such a design is convenient for operation, simple and quick. Other components and connection methods are the same as those of the specific embodiment 1.

[0029] Specific implementation method three: Combination Figure 1This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that the direction of the final-stage on-site dynamic balance adjustment hole 1 opened on the cylinder wall of the cylinder points to the final-stage threaded hole, and the final-stage on-site dynamic balance adjustment hole 1 is used to install or remove the final-stage adjustment screw. The purpose of such a design is to adapt to the overall structure, facilitate operation, and be simple and fast. The other components and connection methods are the same as those of the specific embodiments 1 or 2.

[0030] Specific implementation method four: Combination Figure 1 This embodiment is described. The difference between this embodiment and the first embodiment is that the aperture size of the final threaded hole is smaller than the aperture size of the final on-site dynamic balancing adjustment hole 1. The purpose of such a design is to facilitate adjustment. The other components and connection methods are the same as any one of the first to third embodiments.

[0031] Specific implementation method five: Combination Figure 1 This embodiment is described. The difference between this embodiment and the first embodiment is that the final stage on-site dynamic balancing structure body 3 is arranged in multiple along the circumferential direction of the steam turbine rotor 7. Preferably, 12 are evenly arranged along the circumferential direction on site, and dynamic balancing is adjusted according to actual conditions. Other components and connection methods are the same as any one of the first to fourth embodiments.

[0032] Specific implementation method six: Combination Figure 1 This embodiment is described. The difference between this embodiment and the first embodiment is that the reversing stage on-site dynamic balancing structure body 5 includes a reversing stage threaded hole and a reversing stage adjusting screw. The reversing stage threaded hole is arranged on the reversing stage wheel surface, and the reversing stage adjusting screw is detachably connected to the reversing stage wheel surface through the reversing stage threaded hole. The adjusting screw is installed on the reversing stage threaded hole through the reversing stage on-site dynamic balancing adjusting hole, or the adjusting screw is removed. The function of such a design is convenient for operation, simple and quick. The other components and connection methods are the same as any one of the first to fifth embodiments.

[0033] Specific implementation method seven: Combination Figure 1 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that the direction of the reversing stage on-site dynamic balance adjustment hole 6 opened on the cylinder wall of the cylinder points to the reversing stage threaded hole, and the reversing stage on-site dynamic balance adjustment hole 6 is used to install or remove the reversing stage adjustment screw. The purpose of such a design is to adapt to the overall structure, facilitate operation, and be simple and quick. The other components and connection methods are the same as any one of the specific embodiments 1 to 6.

[0034] Specific implementation method eight: Combination Figure 1 This embodiment is described. The difference between this embodiment and the first embodiment is that the diameter of the threaded hole of the reverse stage is smaller than the diameter of the dynamic balance adjustment hole 6 of the reverse stage. The purpose of such a design is to facilitate adjustment. The other components and connection methods are the same as any one of the first to seventh embodiments.

[0035] Specific implementation method nine: Combination Figure 1 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that the reverse-stage on-site dynamic balancing structure body 5 is arranged in multiple along the circumferential direction of the steam turbine rotor 7. Preferably, 12 are evenly arranged along the circumferential direction on site, and dynamic balancing is adjusted according to actual conditions. The other components and connection methods are the same as any one of the specific embodiments 1 to 8.

[0036] Specific implementation method ten: Combination Figure 1 This embodiment is described. The difference between this embodiment and the first embodiment is that the final stage on-site dynamic balance adjustment hole 1 and the reverse stage on-site dynamic balance adjustment hole 6 opened on the cylinder wall of the cylinder are both sealable structures. The other components and connection methods are the same as any one of the first to ninth embodiments.

[0037] Combination Figure 1 The working principle of the present invention is described:

[0038] The final wheel surface of the present invention is provided with a final on-site dynamic balancing structure body, which is arranged on the inner side of the final factory dynamic balancing groove; the reverse wheel surface is provided with a reverse on-site dynamic balancing structure body, which is arranged on the inner side of the reverse factory dynamic balancing groove; without affecting the structural strength of the wheel disc and the function of the factory dynamic balancing groove, the final on-site dynamic balancing structure body is made as close to the final blade and the reverse blade as possible in the radial direction, and at the same time, a sealable adjustment hole is designed at the corresponding position of the cylinder, so that the dynamic balance amount can be quickly adjusted without dismantling other structures. Similarly, the reverse on-site dynamic balancing structure body is provided. After calculation and testing, the on-site dynamic balancing structure is in a sensitive position for adjusting the imbalance amount, and the balance amount of the rotor can be finely adjusted to achieve a better dynamic balancing effect.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A marine steam turbine rotor on-site dynamic balancing structure, characterized in that It comprises a steam turbine rotor (7), a final stage wheel disc, a reverse stage wheel disc, a cylinder, a final stage on-site dynamic balancing structure body (3) and a reverse stage on-site dynamic balancing structure body (5); The final stage wheel disc and the reverse stage wheel disc are both mounted on the turbine rotor (7), and the cylinder is mounted on the outer sides of the final stage wheel disc and the reverse stage wheel disc; The final wheel disc comprises a final wheel surface and a final wheel rim, wherein the final wheel surface is sleeved on the outer side of a steam turbine rotor (7), the final wheel rim is arranged on the outer side of the final wheel surface, the final wheel rim is used to install external final blades, a final factory dynamic balancing groove (2) is arranged on the final wheel surface near one end of the final wheel rim, a final on-site dynamic balancing structure body (3) is arranged on the final wheel surface, and the final on-site dynamic balancing structure body (3) is arranged on the inner side of the final factory dynamic balancing groove (2); a final on-site dynamic balancing adjustment hole (1) is opened on the cylinder wall of the cylinder; The reverse stage wheel disc comprises a reverse stage wheel surface and a reverse stage wheel rim, the reverse stage wheel surface is mounted on the outer side of a steam turbine rotor (7), the reverse stage wheel rim is arranged on the outer side of the reverse stage wheel surface, the reverse stage wheel rim is used to install an external reverse stage blade, a reverse stage factory dynamic balancing groove (4) is arranged on the reverse stage wheel surface near one end of the reverse stage wheel rim, a reverse stage on-site dynamic balancing structure body (5) is arranged on the reverse stage wheel surface, and the reverse stage on-site dynamic balancing structure body (5) is arranged on the inner side of the reverse stage factory dynamic balancing groove (4); and a reverse stage on-site dynamic balancing adjustment hole (6) is opened on the cylinder wall of the cylinder.

2. The on-site dynamic balancing structure for a marine steam turbine rotor according to claim 1, characterized in that: The final-stage on-site dynamic balancing structure body (3) comprises a final-stage threaded hole and a final-stage adjusting screw, wherein the final-stage threaded hole is arranged on the final-stage wheel surface, and the final-stage adjusting screw is detachably connected to the final-stage wheel surface through the final-stage threaded hole.

3. The on-site dynamic balancing structure for a marine steam turbine rotor according to claim 2, characterized in that: The direction of the final-stage on-site dynamic balance adjustment hole (1) opened on the cylinder wall of the cylinder points to the final-stage threaded hole, and the final-stage on-site dynamic balance adjustment hole (1) is used to install or remove the final-stage adjustment screw.

4. The on-site dynamic balancing structure for a marine steam turbine rotor according to claim 3 is characterized in that: The aperture size of the final-stage threaded hole is smaller than the aperture size of the final-stage on-site dynamic balancing adjustment hole (1).

5. The on-site dynamic balancing structure for a marine steam turbine rotor according to claim 1, characterized in that: A plurality of final-stage on-site dynamic balancing structure bodies (3) are arranged along the circumferential direction of the steam turbine rotor (7).

6. The on-site dynamic balancing structure for a marine steam turbine rotor according to claim 1, characterized in that: The reversing stage on-site dynamic balancing structure body (5) comprises a reversing stage threaded hole and a reversing stage adjusting screw, wherein the reversing stage threaded hole is arranged on the reversing stage wheel surface, and the reversing stage adjusting screw is detachably connected to the reversing stage wheel surface through the reversing stage threaded hole.

7. The on-site dynamic balancing structure for a marine steam turbine rotor according to claim 6, characterized in that: The direction of the reverse stage on-site dynamic balance adjustment hole (6) opened on the cylinder wall of the cylinder points to the reverse stage threaded hole, and the reverse stage on-site dynamic balance adjustment hole (6) is used to install or remove the reverse stage adjustment screw.

8. The on-site dynamic balancing structure for a marine steam turbine rotor according to claim 1, characterized in that: The aperture size of the reverse stage threaded hole is smaller than the aperture size of the reverse stage on-site dynamic balance adjustment hole (6).

9. The on-site dynamic balancing structure for a marine steam turbine rotor according to claim 1, characterized in that: A plurality of reverse-stage on-site dynamic balancing structure bodies (5) are arranged along the circumferential direction of the steam turbine rotor (7).

10. The on-site dynamic balancing structure for a marine steam turbine rotor according to claim 1, characterized in that: The final-stage on-site dynamic balance adjustment hole (1) and the reverse-stage on-site dynamic balance adjustment hole (6) opened on the cylinder wall of the cylinder are both sealable structures.

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