Steam turbine rotor jacking device

Abstract

The utility model discloses a steam turbine rotor top shaft device, including a bracket, a sleeve, a first nut, a screw, a second nut and a connecting plate; both ends of the bracket are provided with a first connecting hole for fixing the bracket; the sleeve is fixed on the bracket; the first nut and the second nut are rotatably mounted on both ends of the sleeve respectively; the screw passes through the first nut, the sleeve and the second nut, and the first nut and the second nut are both threadedly connected with the screw; the connecting plate is fixed on the end of the screw, and a plurality of second connecting holes are provided on the connecting plate, and the axis of the second connecting hole is arranged parallel to the axis of the screw. Such an arrangement simplifies the manufacturing and assembly process, and significantly improves the overall reliability; and the top shaft device has the characteristics of low cost and high efficiency, so that the required materials can be quickly obtained during on-site maintenance, and the rapid maintenance and production of the top shaft device can be realized.

Description

Technical Field

[0001] The utility model relates to the field of steam turbine assembly, in particular to a steam turbine rotor jacking device. Background Art

[0002] A steam turbine is an external combustion rotary machine that can convert steam heat energy into mechanical work. The moving blades and the nozzles and guide vanes on the turbine rotor are the core of the turbine flow section. The steam heat energy is converted into mechanical energy that drives the turbine rotor to rotate, thereby driving other machinery.

[0003] When reinstalling the rotor of a steam turbine after on-site maintenance, it is necessary to push the rotor to measure the axial clearance size. The conventional method relies on multiple maintenance personnel to use a crowbar to move the rotor axially. However, when reinstalling the rotor of some large units, it is generally difficult to push the rotor by using a crowbar due to the large mass of the rotor. This not only causes deviations in the measured rotor axial clearance size, but also makes it easy for maintenance personnel to have personal safety accidents when using crowbars in extremely harsh maintenance environments. Utility Model Content

[0004] In order to solve the problem of adjusting the rotor axial clearance during the assembly of the steam turbine rotor in the prior art, the purpose of the utility model is to provide a steam turbine rotor top shaft device, which ensures the installation accuracy of the steam turbine rotor and the personal safety of maintenance personnel, and is convenient for processing and manufacturing in a short time at the maintenance site to save construction period.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a steam turbine rotor top shaft device, including a bracket, a sleeve, a first nut, a screw rod, a second nut and a connecting plate;

[0006] Both ends of the bracket are provided with first connecting holes for fixing the bracket; the sleeve is fixed on the bracket; the first nut and the second nut are rotatably installed on the two ends of the sleeve respectively; the screw rod passes through the first nut, the sleeve and the second nut, and the first nut and the second nut are both threadedly connected with the screw rod; the connecting plate is fixed on the end of the screw rod, and a plurality of second connecting holes are provided on the connecting plate, and the axis of the second connecting hole is arranged parallel to the axis of the screw rod.

[0007] Preferably, the sleeve is arranged at a central position of the bracket.

[0008] Preferably, a plurality of first connecting holes are arranged around the screw rod.

[0009] Preferably, the axis of the first connecting hole is arranged perpendicular to the axis of the screw.

[0010] Preferably, the first nut is mounted on one end of the sleeve via a first bearing, and the second nut is mounted on the other end of the sleeve via a second bearing.

[0011] Preferably, positioning plates are fixed at both ends of the bracket, and the first connecting hole is arranged on the positioning plates.

[0012] Preferably, a baffle for abutting against the end of the bearing seat is fixed on the bracket.

[0013] Preferably, the bracket is U-shaped, and a reinforcing rib is fixed at the bending portion of the bracket. Reinforcing ribs are fixed at both upper and lower sides of the same bending portion of the bracket.

[0014] Preferably, a through hole is provided on the bracket, the sleeve passes through the through hole, and the sleeve is fixedly connected to the bracket.

[0015] Preferably, the stent is tubular.

[0016] The beneficial effects of the technical solution of the utility model are as follows: 1). Each component is exquisitely designed and optimized in structure, which not only simplifies the manufacturing and assembly process, but also significantly improves the overall reliability; and the top shaft device has the characteristics of low cost and high efficiency, so that the required materials can be quickly obtained during on-site maintenance, and the rapid maintenance and production of the top shaft device can be realized. 2). The installation and operation process of the top shaft device is also extremely simple. Even non-professionals can quickly master its installation and operation skills after a brief training, thereby greatly reducing the labor cost and time cost, and improving the work efficiency of on-site maintenance of the steam turbine. 3). When the top shaft device is used to move the turbine rotor axially, it can ensure that the rotor thrust plate is closely fitted to the main and auxiliary thrust surfaces of the thrust bearing. This feature makes the measured thrust clearance numerical accuracy far exceed the traditional method; through precise measurement, the use of the top shaft device not only greatly reduces the error rate, but also ensures the safety and stability of the turbine operation, thereby demonstrating the excellent performance of the top shaft device during turbine maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structure diagram of the steam turbine rotor jacking device Figure 1 ;

[0018] Figure 2 The structure diagram of the steam turbine rotor jacking device Figure 2 .

[0019] Figure numerals: 1. bracket; 2. baffle; 3. positioning plate; 4. first connecting hole; 5. reinforcing rib; 6. sleeve; 7. first bearing; 8. first nut; 9. second bearing; 10. screw; 11. second nut; 12. connecting plate; 13. turbine rotor; 14. bearing seat; 15. second connecting hole. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Example

[0025] like Figure 1 and Figure 2 A steam turbine rotor top shaft device is shown, comprising a bracket 1, a sleeve 6, a screw 10, a first nut 8, a second nut 11, a bracket 1 fixedly connected to a bearing seat 14, and a connecting plate 12 that can be fixedly connected to the end surface of a steam turbine rotor 13;

[0026] Both ends of the bracket 1 are provided with first connecting holes 4 for fixing the bracket 1, and the bracket 1 is fixedly connected to the bearing seat 14 through the first connecting holes 4 and fasteners, thereby limiting the relative position of the bearing seat 14 and the bracket 1; the sleeve 6 is fixed on the bracket 1; the first nut 8 and the second nut 11 are rotatably installed at both ends of the sleeve 6 respectively; the screw 10 passes through the first nut 8, the sleeve 6 and the second nut 11, and the first nut 8 and the second nut 11 are both threadedly connected to the screw 10; the connecting plate 12 is fixed to the end of the screw 10, and a plurality of second connecting holes 15 are provided on the connecting plate 12, and the axis of the second connecting hole 15 is arranged parallel to the axis of the screw 10, and the connecting plate 12 is fixedly connected to the end face of the turbine rotor 13 through the second connecting hole 15 and fasteners.

[0027] When using the above device to adjust the gap between the rotor 13 and the bearing seat 14: hoist the turbine rotor 13 into the bearing seat 14, and then fix the bracket 1 on the bearing seat 14 through the fasteners and the first connecting hole 4, and then fix the connecting plate 12 and the rotor 13 through the fasteners and the second connecting hole 15. Then, by using a labor-saving tool such as a wrench to rotate the two nuts on the screw 10, the screw 10 is driven to drive the axial movement of the turbine rotor 13, and then the axial gap size of the turbine rotor 13 is accurately adjusted. The use of this top shaft device not only solves the problem that the rotor 13 is heavy and difficult to pry, but also avoids multiple maintenance personnel from working in a dangerous environment, thereby ensuring the accuracy of the rotor 13 installation and the personal safety of the maintenance personnel; and the top shaft device is convenient for processing and manufacturing in a short time at the maintenance site to save the construction cycle.

[0028] The beneficial effects of the jacking device are as follows: 1). Each component is exquisitely designed and the structure is optimized, which not only simplifies the manufacturing and assembly process, but also significantly improves the overall reliability; and the jacking device has the characteristics of low cost and high efficiency, so that the required materials can be quickly obtained during on-site maintenance, and the jacking device can be quickly repaired and manufactured. 2). The installation and operation process of the jacking device is also extremely simple. Even non-professionals can quickly master its installation and operation skills after a brief training, thereby greatly reducing the labor cost and time cost, and improving the efficiency of on-site maintenance of the turbine. 3). When the jacking device is used to move the turbine rotor 13 axially, it can ensure that the thrust disk of the rotor 13 is closely attached to the main and auxiliary thrust surfaces of the thrust bearing. This feature makes the measured thrust clearance value accuracy far exceed the traditional method; through precise measurement, the use of the jacking device not only greatly reduces the error rate, but also ensures the safety and stability of the turbine operation, thereby demonstrating the excellent performance of the jacking device during turbine maintenance.

[0029] In order to improve the positioning accuracy of the turbine rotor 13, in this embodiment, a baffle 2 is fixed on the bracket 1, a positioning plate 3 is fixed at the end of the bracket 1, and a first connecting hole 4 is provided on the positioning plate 3; further preferably, the baffle 2 is provided at the end of the bracket 1, and the positioning plate 3 is installed on the baffle 2; the baffle 2 and the positioning plate 3 are vertically provided, and the first connecting hole 4 is provided on the positioning plate 3; the sleeve 6 is provided at the central position of the bracket 1. When using the above-mentioned top shaft device, since the baffle 2 and the positioning plate 3 are provided at a vertical angle, the angle between the baffle 2 and the positioning plate 3 can be matched with the corner of the bearing seat 14, thereby improving the stability of the top shaft device during use and the positioning accuracy of the top shaft device during installation.

[0030] Furthermore, a plurality of first connection holes 4 are arranged around the screw 10, and the axis of the first connection hole 4 is arranged perpendicular to the axis of the screw 10. Such an arrangement facilitates improving the positioning accuracy between the connection plate 12 and the turbine rotor 13.

[0031] In this embodiment, a through hole is opened on the bracket 1, and the sleeve 6 passes through the through hole, and the sleeve 6 is fixedly connected to the bracket 1; the first nut 8 is installed at one end of the sleeve 6 through the first bearing 7, and the second nut 11 is installed at the other end of the sleeve 6 through the second bearing 9.

[0032] In order to strengthen the strength of the jacking shaft device, in this embodiment, the bracket 1 is U-shaped, and a reinforcing rib 5 is fixed at the bending part of the bracket 1. The reinforcing rib 5 is fixed on both the upper and lower sides of the same bending part of the bracket 1.

[0033] In order to reduce the weight of the jacking device and facilitate its installation, Figure 2 As shown, in this embodiment, the bracket 1 is tubular and the reinforcing rib 5 is plate-shaped.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A steam turbine rotor jacking device, characterized in that: It comprises a bracket (1), a sleeve (6), a first nut (8), a screw rod (10), a second nut (11) and a connecting plate (12); Both ends of the bracket (1) are provided with first connection holes (4) for fixing the bracket (1); The sleeve (6) is fixed on the bracket (1); The first nut (8) and the second nut (11) are rotatably mounted on two ends of the sleeve (6) respectively; The screw rod (10) passes through the first nut (8), the sleeve (6) and the second nut (11), and the first nut (8) and the second nut (11) are both threadedly connected to the screw rod (10); The connecting plate (12) is fixed to the end of the screw rod (10), and a plurality of second connecting holes (15) are provided on the connecting plate (12), wherein the axis of the second connecting holes (15) is arranged parallel to the axis of the screw rod (10).

2. A steam turbine rotor jacking device according to claim 1, characterized in that: The sleeve (6) is arranged at the central position of the bracket (1).

3. A steam turbine rotor jacking device according to claim 1, characterized in that: A plurality of first connection holes (4) are arranged around the screw rod (10).

4. A steam turbine rotor jacking device according to claim 1, characterized in that: The axis of the first connecting hole (4) is arranged perpendicular to the axis of the screw rod (10).

5. The steam turbine rotor jacking device according to claim 1, characterized in that: The first nut (8) is mounted on one end of the sleeve (6) via a first bearing (7), and the second nut (11) is mounted on the other end of the sleeve (6) via a second bearing (9).

6. The steam turbine rotor jacking device according to claim 1, characterized in that: Positioning plates (3) are fixed at both ends of the bracket (1), and the first connection hole (4) is arranged on the positioning plate (3).

7. The steam turbine rotor jacking device according to claim 1, characterized in that: A baffle (2) for abutting against the end of the bearing seat is fixed on the bracket (1).

8. The steam turbine rotor jacking device according to claim 1, characterized in that: The bracket (1) is U-shaped, and a reinforcing rib (5) is fixed at the bend of the bracket (1).

9. The steam turbine rotor jacking device according to claim 1, characterized in that: A through hole is provided on the bracket (1), and the sleeve (6) passes through the through hole. The sleeve (6) is fixedly connected to the bracket (1).

10. The steam turbine rotor jacking device according to claim 1, characterized in that: The support (1) is tubular.

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