Limiting tool for preventing axial movement of steam turbine rotor

Abstract

The utility model provides a steam turbine rotor anti-axial-movement limiting tool, and particularly relates to the technical field of steam turbine rotors, the steam turbine rotor anti-axial-movement limiting tool comprises a seamless steel pipe, the outer side of the seamless steel pipe is provided with a through groove, and a bolt penetrates through a through hole in a fixing plate and is connected to a tile sleeve split surface. The seamless steel pipe and the fixing plate are welded into a whole according to the actual distance between the rotor coupling and the tile sleeve, the limiting pin in the seamless steel pipe makes natural contact with the coupling through the tension of the spring in the seamless steel pipe, and the soft copper sheet arranged at one end of the limiting pin can prevent the limiting pin from scratching the coupling; the nut on the limiting pin is screwed down, one side of the nut makes contact with one end of the seamless steel pipe, in this way, it can be ensured that the limiting pin does not move when being pushed by the coupling wheel, the effect of preventing axial movement of the coupling wheel is achieved, in the assembling process, the stop pin is inserted into the fixing hole, and the protruding block is in interference fit with the groove, so that the pin rod can be prevented from falling off.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine rotors, in particular to an axial displacement prevention and limiting tool for a steam turbine rotor. Background Technique

[0002] When the steam turbine rotor of a thermal power plant is in the turning gear during the installation stage, it is necessary to prevent axial displacement to avoid dynamic and static rubbing of the rotor. At present, a limiting steel plate is installed and fixed on the bearing seat through bolts to limit the axial displacement of the rotor. However, during installation, there are problems: the gap between the installation and the rotor cannot be accurately controlled, and multiple adjustments are required. When temporarily removing the limit, the entire installation needs to be removed and reinstalled repeatedly; moreover, the installation difficulty is large, and high requirements are imposed on the skills of personnel. Content of the Utility Model

[0003] The purpose of the utility model is to provide an axial displacement prevention and limiting tool for a steam turbine rotor to solve the problems raised in the above background technique, that is, when the steam turbine rotor of a thermal power plant is in the turning gear during the installation stage, it is necessary to prevent axial displacement to avoid dynamic and static rubbing of the rotor. At present, a limiting steel plate is installed and fixed on the bearing seat through bolts to limit the axial displacement of the rotor. However, during installation, there are problems: the gap between the installation and the rotor cannot be accurately controlled, and multiple adjustments are required. When temporarily removing the limit, the entire installation needs to be removed and reinstalled repeatedly; moreover, the installation difficulty is large, and high requirements are imposed on the skills of personnel.

[0004] To achieve the above purpose, the utility model provides the following technical solution: an axial displacement prevention and limiting tool for a steam turbine rotor, including a seamless steel pipe. A through groove is opened on the outer side of the seamless steel pipe. A fixing plate is fixedly connected to the outer side of the seamless steel pipe. A through hole is penetrated through one side of the fixing plate. A fixing groove is opened on the inner side of the seamless steel pipe. A limiting pin is slidably penetrated through the inner side of the seamless steel pipe. A spring is sleeved on the outer side of the limiting pin. A threaded groove is opened on the outer side of one end of the limiting pin. A nut is threadedly connected to the outer side of the threaded groove. A soft copper sheet is fixedly connected to one end of the limiting pin. A pin hole is opened on the outer side of the limiting pin. A pin rod is inserted into the inner side of the pin hole. Anti-detachment mechanisms are arranged at both ends of the pin rod.

[0005] Preferably, there are two through holes.

[0006] Preferably, the spring is placed inside the fixing groove, and one end of the spring abuts against one end of the inner cavity of the fixing groove.

[0007] Preferably, the other end of the spring abuts against the outer side of the pin rod.

[0008] Preferably, the anti - detachment mechanism includes fixing holes, grooves, retaining pins and bumps. The fixing holes are opened at both ends of the pin rod. The grooves are opened on the inner cavity side wall of the fixing holes. A retaining pin is inserted into the inner side of the fixing hole, and a bump is fixedly connected to the outer side of the retaining pin.

[0009] Preferably, the bumps are evenly distributed on the outer wall of the retaining pin, the grooves are evenly distributed on the inner wall of the fixing hole, and the inner wall of the groove is adapted to the outer wall of the bump.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows: When using this steam turbine rotor anti - axial displacement limiting tool, the bolt is passed through the through - hole on the fixing plate and connected to the split surface of the bushing. According to the actual distance between the rotor coupling and the bushing, the seamless steel pipe and the fixing plate are welded into a whole. Through the spring tension in the seamless steel pipe, the limiting pin in the seamless steel pipe naturally contacts the coupling. The soft copper sheet arranged at one end of the limiting pin can prevent the limiting pin from scratching the coupling. After the limiting pin naturally contacts the coupling, the nut on the limiting pin is tightened so that one side of the nut contacts one end of the seamless steel pipe. In this way, it can be ensured that the limiting pin will not displace when receiving the thrust from the coupling, thus achieving the effect of preventing axial displacement of the coupling. During assembly, the retaining pin is inserted into the fixing hole, and the bump and the groove are in interference fit, which can prevent the pin rod from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the external structure of the present utility model;

[0012] Figure 2 is a schematic diagram of the mutual cooperation structure of the limiting pin and the pin rod of the present utility model;

[0013] Figure 3 is a schematic diagram of the mutual cooperation structure of the thread groove and the nut of the present utility model;

[0014] Figure 4 is a schematic diagram of the anti - detachment mechanism structure of the present utility model.

[0015] In the figure: 1, seamless steel pipe; 2, through - slot; 3, fixing plate; 4, through - hole; 5, fixing groove; 6, limiting pin; 7, spring; 8, thread groove; 9, nut; 10, soft copper sheet; 11, pin hole; 12, pin rod; 13, fixing hole; 14, groove; 15, retaining pin; 16, bump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions that can be implemented in this application. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in this application.

[0018] Embodiment

[0019] Please refer to Figures 1-4 , a steam turbine rotor anti-axial displacement limiting tool of the present utility model: includes a seamless steel pipe 1, a through groove 2 is opened on the outer side of the seamless steel pipe 1, a fixing plate 3 is fixedly connected to the outer side of the seamless steel pipe 1, a through hole 4 is penetrated and opened on one side of the fixing plate 3, a fixing groove 5 is opened on the inner side of the seamless steel pipe 1, a limiting pin 6 is slidably penetrated and connected to the inner side of the seamless steel pipe 1, a spring 7 is sleeved on the outer side of the limiting pin 6, a thread groove 8 is opened on the outer side of one end of the limiting pin 6, a nut 9 is threadedly connected to the outer side of the thread groove 8, a soft copper sheet 10 is fixedly connected to one end of the limiting pin 6, a pin hole 11 is opened on the outer side of the limiting pin 6, a pin rod 12 is inserted into the inner side of the pin hole 11, and anti-disengagement mechanisms are arranged at both ends of the pin rod 12. When in use, a bolt is penetrated through the through hole 4 on the fixing plate 3 and connected to the split surface of the bushing. According to the actual distance between the rotor coupling and the bushing, the seamless steel pipe 1 and the fixing plate are welded into a whole. Through the tension of the spring 7 in the seamless steel pipe 1, the limiting pin 6 in the seamless steel pipe 1 is in natural contact with the coupling. The soft copper sheet 10 arranged at one end of the limiting pin 6 can avoid scratching the coupling by the limiting pin 6. After the limiting pin 6 is in natural contact with the coupling, the nut 9 on the limiting pin 6 is tightened so that one side of the nut 9 contacts one end of the seamless steel pipe 1, which can ensure that the limiting pin 6 will not displace when receiving the thrust of the coupling, thus achieving the effect of preventing axial displacement of the coupling.

[0020] In order to facilitate the installation of the seamless steel pipe 1, two through holes 4 are provided.

[0021] In order to achieve the effect of preventing axial displacement of the coupling, the spring 7 is placed inside the fixing groove 5, and one end of the spring 7 abuts against one end of the inner cavity of the fixing groove 5.

[0022] To achieve the effect of preventing the shaft from axially moving in the wheel, the other end of the spring 7 abuts against the outer side of the pin rod 12.

[0023] To prevent the pin rod 12 from falling off, the anti - detachment mechanism includes a fixing hole 13, a groove 14, a retaining pin 15 and a convex block 16. The fixing holes 13 are opened at both ends of the pin rod 12. The grooves 14 are opened on the inner cavity side wall of the fixing holes 13. The retaining pin 15 is inserted into the inner side of the fixing hole 13. A convex block 16 is fixedly connected to the outer side of the retaining pin 15. During assembly, the retaining pin 15 is inserted into the fixing hole 13, and the convex block 16 is in interference fit with the groove 14, so that the pin rod 12 can be prevented from falling off.

[0024] To prevent the pin rod 12 from falling off, the convex blocks 16 are evenly distributed on the outer wall of the retaining pin 15, the grooves 14 are evenly distributed on the inner wall of the fixing hole 13, and the inner wall of the groove 14 is adapted to the outer wall of the convex block 16.

[0025] Working principle: During use, the bolt passes through the through - hole 4 on the fixing plate 3 and is connected to the split surface of the bushing. According to the actual distance between the rotor coupling and the bushing, the seamless steel pipe 1 and the fixing plate are welded into a whole. Through the tension of the spring 7 in the seamless steel pipe 1, the limit pin 6 in the seamless steel pipe 1 is in natural contact with the coupling. The soft copper skin 10 provided at one end of the limit pin 6 can prevent the limit pin 6 from scratching the coupling. After the limit pin 6 is in natural contact with the coupling, the nut 9 on the limit pin 6 is tightened so that one side of the nut 9 contacts one end of the seamless steel pipe 1. In this way, it can be ensured that the limit pin 6 will not be displaced when receiving the thrust from the coupling, thus achieving the effect of preventing the shaft from axially moving in the wheel. During assembly, the retaining pin 15 is inserted into the fixing hole 13, and the convex block 16 is in interference fit with the groove 14, so that the pin rod 12 can be prevented from falling off.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam turbine rotor anti-shaft displacement limiting tool, comprising a seamless steel pipe (1), characterized in that: The outer side of the seamless steel pipe (1) is provided with a through groove (2), the outer side of the seamless steel pipe (1) is fixedly connected with a fixing plate (3), one side of the fixing plate (3) is penetrated with a through hole (4), the inner side of the seamless steel pipe (1) is provided with a fixing groove (5), the inner side of the seamless steel pipe (1) is slidably penetrated with a limit pin (6), the outer side of the limit pin (6) is sleeved with a spring (7), the outer side of one end of the limit pin (6) is provided with a thread groove (8), the outer side of the thread groove (8) is threadedly connected with a nut (9), one end of the limit pin (6) is fixedly connected with a soft copper sheet (10), the outer side of the limit pin (6) is provided with a pin hole (11), the inner side of the pin hole (11) is plugged with a pin rod (12), and both ends of the pin rod (12) are provided with anti-slip mechanisms.

2. A steam turbine rotor anti-shaft displacement limiting tool according to claim 1, characterized in that: Two through holes (4) are provided.

3. A steam turbine rotor anti-shaft displacement limiting tool according to claim 1, characterized in that: The spring (7) is placed inside the fixing groove (5), and one end of the spring (7) abuts against one end of the inner cavity of the fixing groove (5).

4. A steam turbine rotor anti-shaft displacement limiting tool according to claim 1, characterized in that: The other end of the spring (7) abuts against the outer side of the pin rod (12).

5. A steam turbine rotor anti-shaft displacement limiting tool according to claim 1, characterized in that: The anti-slip mechanism comprises a fixing hole (13), a groove (14), a stop pin (15) and a protrusion (16); the fixing hole (13) is provided at both ends of the pin rod (12); the groove (14) is provided on the inner cavity side wall of the fixing hole (13); the stop pin (15) is inserted into the inner side of the fixing hole (13); and the protrusion (16) is fixedly connected to the outer side of the stop pin (15).

6. A steam turbine rotor anti-shaft displacement limiting tool according to claim 5, characterized in that: The protrusions (16) are distributed at equal intervals on the outer wall of the stop pin (15), and the grooves (14) are distributed at equal intervals on the inner wall of the fixing hole (13), and the inner wall of the groove (14) is matched with the outer wall of the protrusion (16).

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