Steam turbine rotor coupling connecting structure

Abstract

The utility model relates to the technical field of steam turbine rotor connection, and discloses a steam turbine rotor coupler connecting structure which comprises a first flange and a second flange which are in butt joint in the axial direction, and bolt holes in one-to-one correspondence are formed in the first flange and the second flange. Bolt assemblies are arranged in the bolt holes in a penetrating manner; the bolt assembly comprises a first taper sleeve, a second taper sleeve, a conical screw and a nut. The first taper sleeve is located in a bolt hole of the first flange, and an eccentric hole is formed in the first taper sleeve; the second taper sleeve is located in a bolt hole of the second flange, and an eccentric hole is formed in the second taper sleeve; the conical screw sequentially penetrates through the eccentric hole of the first taper sleeve and the eccentric hole of the second taper sleeve; the two ends of the conical screw are in threaded connection with the nuts respectively. According to the bolt assembly, the requirement for matching and twisting of the bolt holes during installation of the bolt assembly can be effectively lowered.

Description

Technical Field

[0001] This utility model relates to the technical field of turbine rotor connection, specifically to a turbine rotor coupling connection structure. Background Technology

[0002] A steam turbine is a rotary power unit that converts the thermal energy of steam into mechanical work, with its rotor playing a crucial role in the energy conversion process. After steam enters the turbine, it expands and accelerates through nozzles to form a high-speed airflow. This high-speed airflow impacts the moving blades on the rotor, driving the rotor to rotate and thus converting the kinetic energy of the steam into the mechanical energy of the rotor.

[0003] Rotors are connected together via couplings to transmit power between them. Currently, couplings are typically connected using bolt assemblies (such as hydraulic tension bolts). Common hydraulic tension bolts have high requirements for the concentricity and diameter deviation of the bolt holes. However, bolt holes have certain deviations during manufacturing. Figure 1 As shown, before the bolt assembly was installed, the bolt holes on both sides were misaligned, which required the two bolt holes to be reamed during on-site installation of the coupling, resulting in low installation efficiency and a significant impact on the installation schedule. Utility Model Content

[0004] The technical objective of this utility model is to provide a turbine rotor coupling connection structure that can effectively reduce the need for bolt hole fitting during bolt assembly installation, addressing the special characteristics of the aforementioned turbine rotor coupling and the shortcomings of existing technologies.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A turbine rotor coupling connection structure includes a first flange and a second flange that are axially connected. The first flange and the second flange have corresponding bolt holes, and bolt assemblies are installed in the bolt holes.

[0007] The bolt assembly includes a first tapered sleeve, a second tapered sleeve, a tapered bolt, and a nut;

[0008] The first tapered sleeve is located inside the bolt hole of the first flange, and the first tapered sleeve is provided with an eccentric hole;

[0009] The second tapered sleeve is located inside the bolt hole of the second flange, and the second tapered sleeve is provided with an eccentric hole;

[0010] The tapered screw passes through the eccentric hole of the first tapered sleeve and the eccentric hole of the second tapered sleeve in sequence;

[0011] The nuts are threaded to both ends of the tapered screw.

[0012] The above-mentioned technical measures are designed to address the unique characteristics of turbine rotor couplings. By installing a first tapered sleeve in the bolt holes of the first flange and a second tapered sleeve in the bolt holes of the second flange, and by providing eccentric holes for both the first and second tapered sleeves, the tapered bolts can be inserted even when the bolt holes of the first and second flanges are not aligned. This effectively improves installation efficiency and reduces the need for bolt hole alignment, thus enhancing convenience.

[0013] In the above-mentioned technical measures, the tapered screw is locked by tightening the nuts at both ends of the tapered screw, thereby achieving the connection between the first flange and the second flange.

[0014] Furthermore, the first tapered sleeve and the bolt hole of the first flange are clearance-fitted, with a clearance of 0.05mm to 0.1mm.

[0015] Furthermore, the second tapered sleeve and the bolt hole of the second flange are clearance-fitted, with a clearance of 0.05mm to 0.1mm.

[0016] In the above technical measures, the bolt holes of the first tapered sleeve and the first flange, as well as the bolt holes of the second tapered sleeve and the second flange, are all clearance fits. By controlling the size of the fit clearance, it is convenient to assemble and disassemble the first tapered sleeve and the second tapered sleeve. At the same time, it ensures that the first tapered sleeve and the second tapered sleeve have a certain amount of room to move within the corresponding bolt holes, which facilitates the position adjustment of the first tapered sleeve and the second tapered sleeve.

[0017] Furthermore, the eccentric hole of the first conical sleeve has a conical structure;

[0018] The inner conical surface of the eccentric hole of the first conical sleeve mates with the outer conical surface of the conical screw.

[0019] In the above-mentioned technical measures, the eccentric hole of the first tapered sleeve is a tapered structure, and the inner tapered surface of the eccentric hole of the first tapered sleeve matches the outer tapered surface of the tapered screw, ensuring that the tapered screw can pass through the eccentric hole of the first tapered sleeve and ensuring the stability of the tapered screw during the installation process.

[0020] Furthermore, the eccentricity of the eccentric hole of the first tapered sleeve is ≤1mm.

[0021] The above-mentioned technical measures ensure that the tapered screw can pass through the eccentric hole of the first tapered sleeve by controlling the eccentricity of the eccentric hole, thus guaranteeing the stability of the tapered screw during the installation process.

[0022] Furthermore, the eccentric hole of the second conical sleeve has a conical structure;

[0023] The inner conical surface of the eccentric hole of the second conical sleeve mates with the outer conical surface of the conical screw.

[0024] The above-mentioned technical measures include a tapered structure for the eccentric hole of the second tapered sleeve, and the inner tapered surface of the eccentric hole of the second tapered sleeve matches the outer tapered surface of the tapered screw, ensuring that the tapered screw can pass through the eccentric hole of the second tapered sleeve and guaranteeing the stability of the tapered screw during the installation process.

[0025] Furthermore, the eccentricity of the eccentric hole of the second tapered sleeve is ≤1mm.

[0026] The above-mentioned technical measures ensure that the tapered screw can pass through the eccentric hole of the second tapered sleeve by controlling the eccentricity of the eccentric hole, thus guaranteeing the stability of the tapered screw during the installation process.

[0027] Furthermore, an intermediate adjusting ring is provided between the first tapered sleeve and the second tapered sleeve, which is fitted onto the tapered screw and engages with the first tapered sleeve and the second tapered sleeve.

[0028] The above-mentioned technical measures, by setting an intermediate adjusting ring between the first and second tapered sleeves, can, on the one hand, fill the assembly gap between the first and second tapered sleeves; and on the other hand, restrict the axial displacement of the first and second tapered sleeves during the installation of the tapered screw, which is beneficial to enhancing stability.

[0029] Furthermore, the outer diameter of the intermediate adjusting ring is smaller than the diameter of the bolt holes of the first flange and the second flange.

[0030] In the above technical measures, the outer diameter of the intermediate adjusting ring is smaller than the diameter of the bolt holes of the first flange and the second flange, which facilitates the installation and removal of the intermediate adjusting ring in the bolt holes.

[0031] Furthermore, the outer periphery of the intermediate adjusting ring has a radially protruding boss, and the boss and both ends of the intermediate adjusting ring respectively form positioning stop structures;

[0032] Correspondingly, the end of the first conical sleeve that abuts against the intermediate adjusting ring has a stepped positioning stop, and the end of the second conical sleeve that abuts against the intermediate adjusting ring has a stepped positioning stop.

[0033] In the axial mating relationship between the first tapered sleeve, the intermediate adjusting ring, and the second tapered sleeve, the first tapered sleeve and the second tapered sleeve respectively abut against the intermediate adjusting ring through positioning stops.

[0034] In the above-mentioned technical measures, the first tapered sleeve and the second tapered sleeve respectively abut against the intermediate adjusting ring through the positioning stop, which can effectively prevent the first tapered sleeve and the second tapered sleeve from moving axially during the installation of the tapered screw.

[0035] One or more technical solutions provided by this utility model have at least the following technical effects or advantages:

[0036] This invention addresses the unique characteristics of turbine rotor couplings by installing a first tapered sleeve within the bolt holes of the first flange and a second tapered sleeve within the bolt holes of the second flange. Both the first and second tapered sleeves have eccentric holes. Even when the bolt holes of the first and second flanges are misaligned, the tapered bolts can still be inserted through the eccentric holes of the first and second tapered sleeves, effectively improving installation efficiency and reducing the need for bolt hole fitting, thus enhancing convenience. Tightening the nuts at both ends of the tapered bolt locks the bolt, thereby connecting the first and second flanges. Attached Figure Description

[0037] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof.

[0038] Figure 1 This is a schematic diagram of the bolt holes on both sides before the bolt assembly is installed;

[0039] Figure 2 This is a schematic diagram of the structure of the first conical sleeve in this utility model;

[0040] Figure 3 This is a side view of the first conical sleeve in this utility model;

[0041] Figure 4 This is a schematic diagram of the structure of the intermediate adjusting ring in this utility model;

[0042] Figure 5 This is a side view of the intermediate adjusting ring in this utility model;

[0043] Figure 6 This is a schematic diagram showing the effect of installing the first cone sleeve, the second cone sleeve, and the intermediate adjusting ring in this utility model;

[0044] Figure 7 This is a schematic diagram showing the effect of installing the conical screw in this utility model;

[0045] Wherein, 1-first flange; 2-second flange; 3-first tapered sleeve; 4-second tapered sleeve; 5-intermediate adjusting ring; 6-tapered screw; 7-nut. Detailed Implementation

[0046] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0048] Example 1

[0049] Reference Figures 2-7 This embodiment provides a turbine rotor coupling connection structure, including a first flange 1 and a second flange 2 that are axially connected. The first flange 1 and the second flange 2 have corresponding bolt holes, and bolt assemblies are installed in the bolt holes.

[0050] The bolt assembly includes a first tapered sleeve 3, a second tapered sleeve 4, a tapered bolt 6, and a nut 7;

[0051] The first tapered sleeve 3 is located inside the bolt hole of the first flange 1. The first tapered sleeve 3 and the bolt hole of the first flange 1 are clearance-fitted, and the clearance is 0.05mm.

[0052] The first tapered sleeve 3 is provided with an eccentric hole; the eccentricity of the eccentric hole of the first tapered sleeve 3 is 1mm; the eccentric hole of the first tapered sleeve 3 has a tapered structure, and the inner tapered surface of the eccentric hole of the first tapered sleeve 3 matches the outer tapered surface of the tapered screw 6.

[0053] The second tapered sleeve 4 is located inside the bolt hole of the second flange 2. The second tapered sleeve 4 and the bolt hole of the second flange 2 are clearance-fitted, and the clearance is 0.05mm.

[0054] The second tapered sleeve 4 is provided with an eccentric hole; the eccentricity of the eccentric hole of the second tapered sleeve 4 is 1mm; the eccentric hole of the second tapered sleeve 4 has a tapered structure; the inner tapered surface of the eccentric hole of the second tapered sleeve 4 matches the outer tapered surface of the tapered screw 6.

[0055] The tapered screw 6 passes through the eccentric hole of the first tapered sleeve 3 and the eccentric hole of the second tapered sleeve 4 in sequence;

[0056] Nuts 7 are threaded onto both sides of the tapered screw 6.

[0057] An intermediate adjusting ring 5 is provided between the first tapered sleeve 3 and the second tapered sleeve 4, which is fitted onto the tapered screw 6. The intermediate adjusting ring 5 abuts against the first tapered sleeve 3 and the second tapered sleeve 4.

[0058] The outer diameter of the intermediate adjusting ring 5 is smaller than the diameter of the bolt holes of the first flange 1 and the second flange 2.

[0059] The outer periphery of the intermediate adjusting ring 5 has a radially protruding boss, and the boss and the two ends of the intermediate adjusting ring 5 respectively form a positioning stop structure;

[0060] Correspondingly, the end of the first cone sleeve 3 that abuts against the middle adjusting ring 5 has a stepped positioning stop, and the end of the second cone sleeve 4 that abuts against the middle adjusting ring 5 has a stepped positioning stop.

[0061] In the axial mating relationship between the first tapered sleeve 3, the intermediate adjusting ring 5, and the second tapered sleeve 4, the first tapered sleeve 3 and the second tapered sleeve 4 respectively abut against the intermediate adjusting ring 5 through positioning stops.

[0062] The positioning stop of the first cone sleeve 3 matches the positioning stop of the corresponding end of the intermediate adjusting ring 5; the positioning stop of the second cone sleeve 4 matches the positioning stop of the corresponding end of the intermediate adjusting ring 5.

[0063] When applying:

[0064] Step 1: Machin the outer diameter of the first tapered sleeve 3 according to the bolt hole diameter of the first flange 1, and the outer diameter of the second tapered sleeve 4 according to the bolt hole diameter of the second flange 2. Machin the eccentric holes of the first tapered sleeve 3 and the second tapered sleeve 4 according to the tapered surface of the tapered screw 6.

[0065] Step 2: Install the formed first tapered sleeve 3 and second tapered sleeve 4 at the corresponding positions of the tapered screw 6. Process the length of the intermediate adjusting ring 5 according to the axial distance between the first tapered sleeve 3 and the second tapered sleeve 4. Insert the formed first tapered sleeve 3, second tapered sleeve 4 and intermediate adjusting ring 5 into the corresponding bolt holes so that the intermediate adjusting ring 5 abuts against the first tapered sleeve 3 and the second tapered sleeve 4.

[0066] Step 3: Pass the tapered screw 6 through the eccentric hole of the first tapered sleeve 3, the intermediate adjusting ring 5, and the eccentric hole of the second tapered sleeve 4 in sequence. Screw the nut 7 into one end of the tapered screw 6 and put the set distance ring on the other end. Use a hydraulic tensioner to stretch the tapered screw 6. The axial stretching of the tapered screw 6 will cause the first tapered sleeve 3 and the second tapered sleeve 4 to be subjected to radial force, causing the first tapered sleeve 3 and the second tapered sleeve 4 to expand radially, realizing the interference fit between the first tapered sleeve 3 and the second tapered sleeve 4 and the corresponding bolt hole, and at the same time, making the eccentric holes of the first tapered sleeve 3 and the second tapered sleeve 4 automatically aligned.

[0067] Step 4: Remove the spacer ring and hydraulic tensioner from the other end of the tapered screw 6 and screw in the nut 7. Install the actuating ring and positioning sleeve, and use the hydraulic tensioner to stretch the tapered screw 6 again and use the lever to tighten the nut 7 to achieve the connection between the first flange 1 and the second flange 2, thereby achieving the connection between the rotors.

[0068] Example 2

[0069] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0070] The bolt holes of the first tapered sleeve and the first flange are clearance-fitted, with a clearance of 0.1 mm.

[0071] The eccentricity of the eccentric hole of the first tapered sleeve is 0.8mm.

[0072] The second tapered sleeve and the bolt hole of the second flange are clearance-fitted, with a clearance of 0.1 mm.

[0073] The eccentricity of the eccentric hole of the second tapered sleeve is 0.8mm.

[0074] Example 3

[0075] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0076] The bolt holes of the first tapered sleeve and the first flange are clearance-fitted, with a clearance of 0.08 mm.

[0077] The eccentricity of the eccentric hole of the first tapered sleeve is 0.5mm.

[0078] The second tapered sleeve and the bolt hole of the second flange are clearance-fitted, with a clearance of 0.08 mm.

[0079] The eccentricity of the eccentric hole of the second tapered sleeve is 0.5mm.

[0080] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0081] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A steam turbine rotor shaft coupling connection structure, comprising axially butted first and second flanges (1, 2) having one-to-one corresponding bolt holes in which bolt assemblies are fitted; characterized in that: the bolt assembly comprises a first taper sleeve (3), a second taper sleeve (4), a taper screw (6), and a nut (7); the first taper sleeve (3) is located in the bolt hole of the first flange (1), and the first taper sleeve (3) is provided with an eccentric hole; the second taper sleeve (4) is located in the bolt hole of the second flange (2), and the second taper sleeve (4) is provided with an eccentric hole; the taper screw (6) passes through the eccentric holes of the first and second taper sleeves (3, 4) in sequence; and the taper screw (6) is threadedly connected to the nut (7) at both ends.

2. The steam turbine rotor shaft coupling connection structure according to claim 1, characterized in that: the first taper sleeve (3) is clearance-fitted with the bolt hole of the first flange (1), and the fitting clearance is 0.05-0.1 mm.

3. The steam turbine rotor shaft coupling connection structure according to claim 1, characterized in that: the second taper sleeve (4) is clearance-fitted with the bolt hole of the second flange (2), and the fitting clearance is 0.05-0.1 mm.

4. The steam turbine rotor shaft coupling connection structure according to claim 1, characterized in that: the eccentric hole of the first taper sleeve (3) is a taper structure; and the inner taper surface of the eccentric hole of the first taper sleeve (3) is fitted with the outer taper surface of the taper screw (6).

5. The steam turbine rotor shaft coupling connection structure according to claim 4, characterized in that: the eccentric amount of the eccentric hole of the first taper sleeve (3) is ≤1 mm.

6. The steam turbine rotor shaft coupling connection structure according to claim 1, characterized in that: the eccentric hole of the second taper sleeve (4) is a taper structure; and the inner taper surface of the eccentric hole of the second taper sleeve (4) is fitted with the outer taper surface of the taper screw (6).

7. The steam turbine rotor shaft coupling connection structure according to claim 6, characterized in that: the eccentric amount of the eccentric hole of the second taper sleeve (4) is ≤1 mm.

8. The steam turbine rotor shaft coupling connection structure according to claim 1, characterized in that: an intermediate adjusting ring (5) is provided between the first and second taper sleeves (3, 4) and is sleeved on the taper screw (6), and the intermediate adjusting ring (5) is abuttingly fitted with the first and second taper sleeves (3, 4).

9. The steam turbine rotor shaft coupling connection structure according to claim 8, characterized in that: the outer diameter of the intermediate adjusting ring (5) is smaller than the diameter of the bolt hole of the first and second flanges (1, 2).

10. The steam turbine rotor shaft coupling connection structure according to claim 8, characterized in that: the outer periphery of the intermediate adjusting ring (5) has a radially outwardly convex boss, and the boss and both ends of the intermediate adjusting ring (5) respectively form positioning stop structure. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Correspondingly, the first cone sleeve (3) abuts against the positioning stopper with step structure of the end of the intermediate adjusting ring (5), and the second cone sleeve (4) abuts against the positioning stopper with step structure of the end of the intermediate adjusting ring (5); In the axial abutting connection of the first cone sleeve (3), the intermediate adjusting ring (5) and the second cone sleeve (4), the first cone sleeve (3) and the second cone sleeve (4) respectively abut against the intermediate adjusting ring (5) through the positioning stopper.

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