High-pressure rotor of steam turbine

Abstract

The utility model relates to the field of steam turbine rotors, and particularly discloses a steam turbine high-pressure rotor which comprises a steam turbine rotor, a balance assembly is arranged on the steam turbine rotor, and the balance assembly comprises a balance block and a bolt A; an annular groove is formed in the middle of the steam turbine rotor, an inner groove is formed in the middle of the annular groove, the balance block is embedded into the annular groove and is in sliding connection with the steam turbine rotor, a counterbore is formed in the middle of the balance block, the bolt A is embedded into the counterbore, and one end of the bolt A penetrates through the counterbore and extends into the inner groove. Threaded holes do not need to be formed, the annular groove replaces the threaded holes, the original balance degree of the rotor is not affected, the balance blocks are annularly distributed in the annular groove, dynamic balance adjustment is carried out by adjusting the positions of the balance blocks, the installation positions of the balance blocks can be adjusted in a stepless mode, and precision is higher.

Description

Technical Field

[0001] The present application relates to the field of steam turbine rotors, and in particular to a steam turbine high-pressure rotor. Background Art

[0002] Steam turbine rotor, also known as steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and then sprays onto the blades, causing the rotor with blade rows to rotate and perform external work. Steam turbine rotor is the main equipment of modern thermal power plants and is also used in metallurgical industry, chemical industry, and ship power devices.

[0003] Due to the influence of mechanical precision when the high-pressure rotor of the turbine rotates, a balancing block is needed to improve the dynamic balance of the rotor when it rotates at high speed. The common balancing method is to glue the balancing block to the lighter side of the rotor with glue, and another method is to install the balancing block with bolts. The balancing block glued with glue is easy to fall off due to aging after long-term use. The bolt installation method requires opening a threaded hole on the rotor, and the threaded hole cannot be opened individually. At least two symmetrical threaded holes need to be opened to maintain the original balance of the rotor. The method of opening threaded holes limits the installation position of the balancing block, and the adjustment accuracy is limited when performing dynamic balancing adjustments. Utility Model Content

[0004] In order to improve the problem that the balancing block cannot be freely installed, the present application provides a high-pressure rotor of a steam turbine.

[0005] The present application provides a steam turbine high-pressure rotor adopts the following technical solution:

[0006] A steam turbine high-pressure rotor, characterized in that: it comprises a steam turbine rotor, a balancing assembly is provided on the steam turbine rotor, and the balancing assembly comprises a balancing block and a bolt A;

[0007] An annular groove is provided in the middle of the turbine rotor, an inner groove is provided in the center of the annular groove, a balancing block is embedded in the annular groove and is slidably connected with the turbine rotor, a countersunk hole is provided in the middle of the balancing block, a bolt A is embedded in the countersunk hole, and one end of the bolt A extends through the countersunk hole into the inner groove.

[0008] Preferably, the cross section of the annular groove is trapezoidal, and the cross section of the balancing block is trapezoidal;

[0009] By adopting the above technical solution, the trapezoidal balancing weight is embedded in the trapezoidal annular groove to prevent it from falling off.

[0010] Preferably, the balancing block is in an arc shape, wherein one end of the countersunk hole on the balancing block is provided with an internal thread, the outer side of the bolt A is provided with an external thread, and the bolt A passes through the countersunk hole and is threadedly connected to the balancing block;

[0011] By adopting the above technical solution, the arc-shaped balancing block will rotate around the annular groove when sliding, so as to adjust the position of the balancing block. By installing multiple balancing blocks at different positions, the balance of the turbine rotor can be adjusted.

[0012] Preferably, a hexagonal groove is formed at one end of the bolt A, and an anti-slip cap is provided at the other end of the bolt A, and the anti-slip cap is made of rubber;

[0013] By adopting the above technical solution, bolt A can be removed and installed with a hexagonal wrench. Bolt A is rotated clockwise to press the anti-slip cap against the inner wall of the inner groove. Bolt A presses against the reverse thrust generated by the turbine rotor to restrict the balancing block to a fixed position in the annular groove, thereby limiting the position of the balancing block.

[0014] Preferably, a plurality of balancing weights are annularly mounted inside the annular groove;

[0015] By adopting the above technical solution, the distance between every two balancing blocks can be adjusted arbitrarily, and the dynamic balance of the turbine rotor can be improved by using multiple balancing blocks.

[0016] Preferably, a plurality of limiting grooves are provided at one end of the steam turbine rotor, an impeller shaft is provided at one end of the steam turbine rotor located at the limiting groove, one end of the impeller shaft is against the end of the steam turbine rotor, and a plurality of integrally fixed limiting rods are provided at one end of the impeller shaft, and the limiting rods are embedded in the limiting groove;

[0017] By adopting the above technical solution, the impeller shaft is embedded in the limiting groove, so that the turbine rotor is limited by the limiting rod when rotating at high speed. The pulling force generated by the high-speed rotation of the turbine rotor drives the impeller shaft to rotate synchronously through the limiting rod. The embedded connection method makes the connection between the impeller shaft and the turbine rotor more stable.

[0018] Preferably, the cross-sections of the limiting rod and the limiting groove are both arc-shaped;

[0019] By adopting the above technical solution, the limit rod is embedded in the limit groove tightly, which reduces the wind resistance generated during high-speed rotation and reduces kinetic energy loss.

[0020] Preferably, a hollow layer is provided at one end of the impeller shaft close to the limit rod, symmetrical through grooves are provided on both sides of the hollow layer, a bolt B is provided inside the hollow layer, a threaded hole is provided at one end of the steam turbine rotor, and the bolt B passes through the through groove and is embedded in the internal thread of the threaded hole for fixing;

[0021] By adopting the above technical solution, the impeller shaft and the turbine rotor can be separated, so as to facilitate equipment maintenance after long-term use. When disassembly is required, the bolt B can be removed through the reserved through groove to separate the impeller shaft from the turbine rotor.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] The utility model does not need to open threaded holes, and the threaded holes are replaced by opening annular grooves, which does not affect the original balance of the rotor. A plurality of balancing blocks are distributed in annular shapes inside the annular grooves, and dynamic balance adjustment is performed by adjusting the positions of the balancing blocks. The installation position of the balancing blocks can be adjusted steplessly, with higher precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0025] Figure 2 This is a schematic diagram of the explosion structure of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the balancing block of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of bolt A of the utility model.

[0028] Reference numerals: 100, turbine rotor; 101, annular groove; 102, inner groove; 103, limiting groove; 104, threaded hole;

[0029] 200, balance block; 201, countersunk hole; 202, anti-slip cap; 203, bolt A;

[0030] 300, impeller shaft; 301, limit rod; 302, through groove; 303, bolt B. DETAILED DESCRIPTION

[0031] Embodiment 1, below is combined with the attached Figure 1 —4 Provide further details of this application.

[0032] The embodiment of the present application discloses a high-pressure rotor of a steam turbine, including a steam turbine rotor 100, on which a balancing assembly is provided, and the balancing assembly includes a balancing block 200 and a bolt A203;

[0033] See also Figure 1-4 An annular groove 101 is provided in the middle position of the turbine rotor 100, an inner groove 102 is provided in the center position of the annular groove 101, a plurality of balancing blocks 200 are provided, the balancing blocks 200 are embedded in the annular groove 101, the balancing blocks 200 are slidingly connected to the turbine rotor 100, the balancing blocks 200 are arc-shaped, and a plurality of balancing blocks 200 are annularly installed in the annular groove 101.

[0034] Through the above arrangement, the arc-shaped balancing block 200 will rotate around the annular groove 101 when sliding, so as to adjust the position of the balancing block 200. By installing multiple balancing blocks 200 at different positions, the balance of the turbine rotor 100 can be adjusted. The distance between every two balancing blocks 200 can be adjusted arbitrarily. By using multiple balancing blocks 200, the dynamic balance of the turbine rotor 100 can be improved. The cross-section of the annular groove 101 is trapezoidal, and the cross-section of the balancing block 200 is trapezoidal. The trapezoidal balancing block 200 is embedded in the trapezoidal annular groove 101 to prevent it from falling off.

[0035] See also Figure 1-4 An internal thread is provided at one end of the countersunk hole 201, and an external thread is provided on the outer side of the bolt A203 near one end. The bolt A203 passes through the countersunk hole 201 and is movably installed with the balance block 200. One end of the bolt A203 passes through the middle of the countersunk hole 201 and is embedded in the inner groove 102. The anti-slip cap 202 is sleeved on one end of the bolt A203. The anti-slip cap 202 is made of rubber, and a hexagonal groove is provided at one end of the bolt A203.

[0036] Through the above arrangement, the bolt A203 can be disassembled and installed by a hexagonal wrench. The bolt A203 is rotated clockwise to press the anti-slip cap 202 against the inner wall of the inner groove 102. The bolt A203 presses against the reverse thrust generated by the turbine rotor 100 to restrict the balance block 200 to a fixed position in the annular groove 101, thereby limiting the position of the balance block 200.

[0037] See also Figure 1-4 A plurality of limiting grooves 103 are provided in a ring shape at one end of the steam turbine rotor 100. The impeller shaft 300 is located at one end of the steam turbine rotor 100. One end of the impeller shaft 300 is in contact with the steam turbine rotor 100. A plurality of limiting rods 301 are distributed in a ring shape at one end of the impeller shaft 300 and are integrally fixed. The limiting rods 301 are embedded in the limiting grooves 103, and the impeller shaft 300 is embedded in the limiting grooves 103.

[0038] Through the above arrangement, the turbine rotor 100 is limited by the limit rod 301 when rotating at high speed. The pulling force generated by the high-speed rotation of the turbine rotor 100 drives the impeller shaft 300 to rotate synchronously through the limit rod 301. The embedded connection method makes the connection between the impeller shaft 300 and the turbine rotor 100 more stable. The cross-sections of the limit rod 301 and the limit groove 103 are both arc-shaped; the limit rod 301 is embedded in the interior of the limit groove 103 and fits tightly, reducing the wind resistance generated during high-speed rotation and reducing kinetic energy loss.

[0039] See also Figure 1-4The impeller shaft 300 is provided with a hollow layer at one end of the limit rod 301, and two symmetrical through grooves 302 are provided on the hollow layer. The bolt B303 is installed inside the hollow layer. The threaded hole 104 is provided at one end of the steam turbine rotor 100, and the bolt B303 passes through the through groove 302 and is embedded in the internal thread of the threaded hole 104 for fixing; the impeller shaft 300 and the steam turbine rotor 100 are separable to facilitate equipment maintenance after long-term use. When disassembly is required, the bolt B303 can be removed through the reserved through groove 302 to separate the impeller shaft 300 from the steam turbine rotor 100.

[0040] Working principle: When in use, one end of the impeller shaft 300 is brought into contact with the turbine rotor 100, so that the limiting rod 301 at the end of the impeller shaft 300 is embedded in the corresponding limiting groove 103, and the limiting rod 301 is embedded in the inside of the limiting groove 103 tightly, thereby reducing the wind resistance generated during high-speed rotation and reducing the kinetic energy loss. Then, the bolt B303 is passed through the through groove 302 and fixed to the turbine rotor 100, so that the turbine rotor 100 and the impeller shaft 300 are fixed as an integral structure, and the balancing block 200 can slide inside the annular groove 101. The arc-shaped balancing block 200 will rotate around the annular groove 101 when sliding, thereby adjusting the position of the balancing block 200. By installing a plurality of balancing blocks 200 at different positions, the balance of the turbine rotor 100 can be adjusted. The distance between each two balancing blocks 200 can be adjusted arbitrarily, and the dynamic balance of the turbine rotor 100 is improved by using a plurality of balancing blocks 200.

[0041] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A steam turbine high pressure rotor, characterized in that: The invention comprises a steam turbine rotor (100), wherein a balancing assembly is provided on the steam turbine rotor (100), and the balancing assembly comprises a balancing block (200) and a bolt A (203); The turbine rotor (100) is provided with an annular groove (101) at the middle position, an inner groove (102) is provided at the center position of the annular groove (101), a balancing block (200) is embedded in the annular groove (101) and is slidably connected with the turbine rotor (100), wherein a countersunk hole (201) is provided in the middle of the balancing block (200), a bolt A (203) is embedded in the countersunk hole (201), and one end of the bolt A (203) passes through the countersunk hole (201) and extends into the inner groove (102).

2. A steam turbine high pressure rotor according to claim 1, characterized in that: The cross section of the annular groove (101) is in a trapezoidal shape, and the cross section of the balancing block (200) is in a trapezoidal shape.

3. A steam turbine high pressure rotor according to claim 1, characterized in that: The balancing block (200) is arc-shaped, wherein one end of the countersunk hole (201) on the balancing block (200) is provided with an internal thread, the outer side of the bolt A (203) is provided with an external thread, and the bolt A (203) passes through the countersunk hole (201) and is threadedly connected to the balancing block (200).

4. A steam turbine high pressure rotor according to claim 1, characterized in that: One end of the bolt A (203) is provided with a hexagonal groove, and the other end of the bolt A (203) is covered with an anti-slip cap (202), and the anti-slip cap (202) is made of rubber material.

5. The high-pressure rotor of a steam turbine according to claim 1, characterized in that: A plurality of the balancing blocks (200) are annularly mounted inside the annular groove (101).

6. A steam turbine high pressure rotor according to claim 1, characterized in that: A plurality of limiting grooves (103) are provided at one end of the steam turbine rotor (100), an impeller shaft (300) is provided at one end of the steam turbine rotor (100) located at the limiting groove (103), one end of the impeller shaft (300) is against the end of the steam turbine rotor (100), and a plurality of integrally fixed limiting rods (301) are provided at one end of the impeller shaft (300), and the limiting rods (301) are embedded in the limiting groove (103).

7. A steam turbine high pressure rotor according to claim 6, characterized in that: The cross-sections of the limiting rod (301) and the limiting groove (103) are both arc-shaped.

8. A steam turbine high pressure rotor according to claim 6, characterized in that: The impeller shaft (300) is provided with a hollow layer at one end close to the limiting rod (301), symmetrical through grooves (302) are provided on both sides of the hollow layer, a bolt B (303) is provided inside the hollow layer, a threaded hole (104) is provided at one end of the steam turbine rotor (100), and the bolt B (303) passes through the through groove (302) and is embedded in the internal thread of the threaded hole (104) for fixing.

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