Automatic adjusting mechanism for shaft seal clearance of steam turbine

Abstract

The utility model belongs to the technical field of steam turbine shaft seal gaps, and particularly relates to a steam turbine shaft seal gap automatic adjusting mechanism which comprises a shaft sleeve and a shaft rod penetrating through the shaft sleeve, and a plurality of first shaft seal blocks and a plurality of second shaft seal blocks are distributed in the shaft sleeve in an annular array mode. The multiple first shaft sealing blocks and the multiple second shaft sealing blocks are sequentially distributed at intervals, shaft holes allowing a shaft rod to pass through are formed between the multiple first shaft sealing blocks and the multiple second shaft sealing blocks, and driving mechanisms linearly driving from outside to inside are arranged between each first shaft sealing block and the shaft sleeve and between each second shaft sealing block and the shaft sleeve. Due to the fact that the first shaft sealing blocks, the second shaft sealing blocks and the driving mechanisms are additionally arranged and distributed in the annular array mode, when the driving mechanisms are driven, the first shaft sealing blocks and the second shaft sealing blocks can be conveniently driven to be close to or away from the shaft rod, and the gap between the shaft hole and the shaft rod can be conveniently and automatically adjusted.

Description

Technical Field

[0001] This utility model belongs to the technical field of turbine shaft seal clearance, specifically relating to an automatic adjustment mechanism for turbine shaft seal clearance. Background Technology

[0002] The adjustment of the turbine shaft seal clearance needs to take into account factors such as thermal expansion and rotor motion characteristics. Too large or too small clearance will affect the unit's efficiency and safe operation.

[0003] Excessive shaft seal clearance can lead to steam leakage or air infiltration, reducing unit efficiency. Insufficient shaft seal clearance can cause friction between the rotor and stator when heated or vibrating, resulting in localized heating, deformation, or even shaft vibration failure. Existing shaft seal clearances cannot be automatically adjusted. When clearance problems occur, the equipment must be shut down and extensively disassembled before maintenance and replacement can be performed, which is inefficient, time-consuming, and affects the normal operation of the steam turbine. Utility Model Content

[0004] The purpose of this invention is to provide an automatic adjustment mechanism for turbine shaft seal clearance, in order to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic adjustment mechanism for turbine shaft seal clearance, comprising: a shaft sleeve and a shaft rod passing through the shaft sleeve; the shaft sleeve has a plurality of first shaft seal blocks and a plurality of second shaft seal blocks arranged in a circular array inside, and the plurality of first shaft seal blocks and the plurality of second shaft seal blocks are arranged sequentially at intervals; a shaft hole for the shaft rod to pass through is formed between the plurality of first shaft seal blocks and the plurality of second shaft seal blocks; each of the first shaft seal blocks and the second shaft seal blocks is provided with a drive mechanism that drives linearly from the outside to the inside between the shaft sleeve and the first shaft seal blocks and the second shaft seal blocks; the drive mechanism drives the plurality of first shaft seal blocks and the plurality of second shaft seal blocks to move closer to or away from one side of the shaft rod.

[0006] Preferably, each of the drive mechanisms includes an air supply pipe and a piston. Each piston is installed on the outside of the first or second shaft seal block. The inner wall of the bushing is provided with multiple air chambers to accommodate the piston. The outside of the multiple bushings is provided with multiple air pipe joints communicating with the air chambers. The multiple air supply pipes are respectively connected and installed on the corresponding air pipe joints.

[0007] Preferably, each of the air supply pipes is provided with a pressure gauge and a solenoid valve in sequence, with the pressure gauge located at the end of the solenoid valve near the bushing.

[0008] Preferably, an annular groove is formed around the inner wall of the bushing, and a plurality of first shaft seal blocks and a plurality of second shaft seal blocks are disposed in the annular groove.

[0009] Preferably, a plurality of first plug-in ends and a plurality of second plug-in ends for shaft sealing are provided between adjacent first shaft sealing blocks and second shaft sealing blocks, and the plurality of first plug-in ends and the plurality of second plug-in ends are respectively plugged into the ends of the second shaft sealing block and the first shaft sealing block.

[0010] Preferably, a second plug groove is formed between two adjacent first plug ends to accommodate the insertion of a second plug end, and a first plug groove is formed between two adjacent second plug ends to accommodate the insertion of a first plug end.

[0011] Compared with the prior art, this utility model has the following advantages:

[0012] (1) By adding multiple first shaft seal blocks and multiple second shaft seal blocks arranged in a ring array and multiple driving mechanisms, the present invention facilitates the movement of multiple first shaft seal blocks and multiple second shaft seal blocks toward or away from the shaft rod when the driving mechanism is driven, so as to facilitate the automatic adjustment of the gap between the shaft hole and the shaft rod.

[0013] (2) By adding an air supply pipe, piston and air chamber, this utility model facilitates the piston to extend and retract in the air chamber when the air supply pipe supplies air, thereby facilitating the position adjustment of the first shaft seal block and the second shaft seal block.

[0014] (3) By adding a pressure gauge and a solenoid valve, this utility model can detect the change in air pressure in the air chamber when the shaft seal gap changes, and automatically supply and release air according to the change in air pressure through the solenoid valve, which facilitates automatic adjustment of the shaft seal gap. Attached Figure Description

[0015] Figure 1 This is a side view of the present invention;

[0016] Figure 2 This is a front view of the present invention;

[0017] Figure 3 This is a cross-sectional view of the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of the first shaft sealing block and the second shaft sealing block of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the pressure gauge, solenoid valve and air supply pipe of this utility model;

[0020] In the diagram: 1. Shaft; 2. Bushing; 3. Air pipe connector; 4. Air supply pipe; 5. First shaft seal block; 6. Second shaft seal block; 7. Solenoid valve; 8. Shaft hole; 9. First insertion end; 10. Second insertion end; 11. Air chamber; 12. Piston; 13. Annular groove; 14. First insertion groove; 15. Second insertion groove; 16. Pressure gauge. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] refer to Figure 1-2 As shown, the automatic adjustment mechanism for turbine shaft seal clearance provided by this utility model includes: a shaft sleeve 2 and a shaft rod 1 passing through the shaft sleeve 2. The shaft sleeve 2 has a plurality of first shaft seal blocks 5 and a plurality of second shaft seal blocks 6 arranged in a ring array inside, and the plurality of first shaft seal blocks 5 and the plurality of second shaft seal blocks 6 are arranged in sequence at intervals. A shaft hole 8 for the shaft rod 1 to pass through is formed between the plurality of first shaft seal blocks 5 and the plurality of second shaft seal blocks 6. Each first shaft seal block 5 and the plurality of second shaft seal blocks 6 is provided with a drive mechanism that drives linearly from the outside to the inside between the shaft sleeve 2. The drive mechanism drives the plurality of first shaft seal blocks 5 and the plurality of second shaft seal blocks 6 to move closer to or away from one side of the shaft rod 1.

[0023] Combination Figure 2 As shown, an annular groove 13 is provided around the inner wall of the bushing 2, and multiple first shaft sealing blocks 5 and multiple second shaft sealing blocks 6 are all disposed in the annular groove 13.

[0024] Combination Figure 3-4 As shown, a plurality of first insertion ends 9 and a plurality of second insertion ends 10 for shaft sealing are provided between adjacent first shaft sealing blocks 5 and second shaft sealing blocks 6, and the plurality of first insertion ends 9 and the plurality of second insertion ends 10 are respectively inserted into the ends of the second shaft sealing block 6 and the first shaft sealing block 5.

[0025] Combination Figure 3-4 As shown, a second plug groove 15 is formed between two adjacent first plug ends 9 to accommodate the insertion of a second plug end 10, and a first plug groove 14 is formed between two adjacent second plug ends 10 to accommodate the insertion of a first plug end 9.

[0026] As described above, using the bushing 2, shaft 1, multiple first shaft sealing blocks 5, multiple second shaft sealing blocks 6, and multiple drive mechanisms provided by this utility model, the multiple first shaft sealing blocks 5 and multiple second shaft sealing blocks 6 are installed in a ring array on the inner wall of the bushing 2 through the annular groove 13. At this time, the shaft 1 is inserted through and into the shaft hole 8 between the multiple first shaft sealing blocks 5 and multiple second shaft sealing blocks 6. At this time, multiple first insertion ends 9 and multiple insertion ends on adjacent first shaft sealing blocks 5 and second shaft sealing blocks 6 are respectively inserted into the second insertion ends on the second shaft sealing blocks 6 and the first shaft sealing blocks 5. In the groove 15 and the first insertion groove 14, a ring-shaped shaft sealing mechanism is formed between the bushing 2 and the shaft 1. Through the first insertion end 9 and the second insertion end 10, multiple staggered shaft sealing structures are formed on the shaft 1 to avoid leakage at the gap between adjacent first shaft sealing blocks 5 and second shaft sealing blocks 6. When the size of the shaft hole 8 changes, multiple driving mechanisms can drive multiple first shaft sealing blocks 5 and multiple second shaft sealing blocks 6 to adjust their positions, so that the size of the shaft hole 8 is kept at a threshold, and the equipment can automatically adjust the shaft sealing gap.

[0027] In this utility model, combined with Figure 3 As shown, each drive mechanism in this embodiment includes an air supply pipe 4 and a piston 12. Each piston 12 is installed on the outside of the first shaft seal block 5 or the second shaft seal block 6. Multiple air chambers 11 for accommodating the piston 12 are opened on the inner wall of the bushing 2. Multiple air pipe joints 3 communicating with the air chambers 11 are provided on the outside of the multiple bushings 2. Multiple air supply pipes 4 are respectively connected and installed on the corresponding air pipe joints 3.

[0028] As described above, in the drive mechanism provided by this utility model, the first shaft seal block 5 and the second shaft seal block 6 are both telescopically installed in the air chamber 11 via the piston 12. External gas enters the air chamber 11 through the air supply pipe 4, thereby adjusting the position of the piston 12 in the air chamber 11, which in turn drives the first shaft seal block 5 or the second shaft seal block 6 to move closer to or away from one side of the shaft rod 1, realizing the function of automatic shaft seal gap adjustment of the equipment without disassembling the equipment.

[0029] Furthermore, to facilitate real-time detection of the shaft seal clearance, refer to Figure 5 As shown, each air supply pipe 4 is equipped with a pressure gauge 16 and a solenoid valve 7 in sequence, with the pressure gauge 16 located at the end of the solenoid valve 7 near the bushing 2. When the shaft seal clearance changes, it will cause the piston 12 to change position in the air chamber 11, thereby detecting the change in air pressure in the air chamber 11 through the pressure gauge 16. At the same time, the air supply pipe 4 is opened through the solenoid valve 7, thereby balancing the air pressure in the air chamber 11 through the air supply pipe 4, realizing the automatic adjustment of the shaft seal clearance by the equipment.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic adjustment mechanism for turbine shaft seal clearance, characterized in that, include: The bushing (2) and the shaft (1) passing through the bushing (2) are provided. The bushing (2) has a plurality of first shaft seal blocks (5) and a plurality of second shaft seal blocks (6) arranged in a ring array inside. The plurality of first shaft seal blocks (5) and the plurality of second shaft seal blocks (6) are arranged in sequence at intervals. A shaft hole (8) for the shaft (1) to pass through is formed between the plurality of first shaft seal blocks (5) and the plurality of second shaft seal blocks (6). Each first shaft seal block (5) and the second shaft seal block (6) is provided with a drive mechanism that drives linearly from the outside to the inside between the bushing (2). The drive mechanism drives the plurality of first shaft seal blocks (5) and the plurality of second shaft seal blocks (6) to move closer to or away from one side of the shaft (1).

2. The automatic adjustment mechanism for turbine shaft seal clearance according to claim 1, characterized in that: Each of the drive mechanisms includes an air supply pipe (4) and a piston (12). Each piston (12) is installed on the outside of the first shaft seal block (5) or the second shaft seal block (6). The inner wall of the bushing (2) is provided with multiple air chambers (11) for accommodating the pistons (12). The outside of the multiple bushings (2) is provided with multiple air pipe connectors (3) that communicate with the air chambers (11). The multiple air supply pipes (4) are respectively connected and installed on the corresponding air pipe connectors (3).

3. The automatic adjustment mechanism for turbine shaft seal clearance according to claim 2, characterized in that: Each of the air supply pipes (4) is provided with a pressure gauge (16) and a solenoid valve (7) in sequence, with the pressure gauge (16) located at the end of the solenoid valve (7) near the bushing (2).

4. The automatic adjustment mechanism for turbine shaft seal clearance according to claim 1, characterized in that: The inner wall of the bushing (2) is provided with an annular groove (13), and a plurality of first shaft seal blocks (5) and a plurality of second shaft seal blocks (6) are disposed in the annular groove (13).

5. The automatic adjustment mechanism for turbine shaft seal clearance according to claim 1, characterized in that: Each of the adjacent first shaft seal block (5) and second shaft seal block (6) is provided with a plurality of first plug-in ends (9) and a plurality of second plug-in ends (10) for shaft sealing. The plurality of first plug-in ends (9) and the plurality of second plug-in ends (10) are respectively plugged into the ends of the second shaft seal block (6) and the first shaft seal block (5).

6. The automatic adjustment mechanism for turbine shaft seal clearance according to claim 5, characterized in that: A second plug groove (15) is formed between two adjacent first plug ends (9) to accommodate the insertion of a second plug end (10), and a first plug groove (14) is formed between two adjacent second plug ends (10) to accommodate the insertion of a first plug end (9).

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