Gap-adjustable steam seal structure of steam turbine

Abstract

The utility model discloses a gap-adjustable steam seal structure of a steam turbine, which relates to the technical field of steam seal structures of steam turbines and comprises a fixing frame. Due to the arrangement of the fixing ring arranged on the inner wall of the sealing shell, the gap adjusting mechanism arranged on the inner wall of the fixing ring, the damping adjusting mechanism arranged on the surface of the dynamic ring and the honeycomb layer, when the shaft sealing ring is used, the shaft sealing ring is installed around the rotating shaft; the adjusting spring and the damping spring are stressed to move to change the distance between the dynamic ring and the fixed ring, it is ensured that the shaft sealing ring is always in close contact with a shaft, and therefore a stable sealing gap is kept, the honeycomb layer can provide a larger contact area and denser sealing points, steam or other media are more effectively prevented from leaking, and the service life of the shaft sealing ring is prolonged. And meanwhile, the flexible design of the honeycomb structure can better adapt to axial displacement and slight vibration, more reliable sealing performance is provided, energy loss is reduced, and the efficiency of the steam turbine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine steam seal structures, in particular to a steam turbine steam seal structure with adjustable clearance. Background Art

[0002] A steam turbine is a device that uses the energy of steam or other high-temperature and high-pressure gases to drive a rotor to generate mechanical work. It is a thermal machine mainly used in power plants, ship power systems, industrial processes and some specific mechanical drive needs. The steam seal structure is a key component in a steam turbine. Its main function is to form a closed environment on the high-speed rotating shaft to prevent high-temperature and high-pressure steam from leaking into the environment or entering bearings and other key mechanical components, thereby playing a protective and sealing role. The steam seal structure of a steam turbine consists of a dynamic ring, a static ring, a sealing casing and other parts. Each part plays a key sealing and protective role, thereby ensuring that the steam turbine can operate safely and efficiently.

[0003] The utility model patent with announcement number CN211258727U discloses a steam turbine seal gap adjustment device and a steam turbine seal structure, including a fixed shell, the fixed shell is a cylindrical structure, one end of the cylindrical structure is provided with a first central through hole along its axial direction, and the other end of the cylindrical structure is provided with a second central through hole along its axial direction, the first central through hole is provided with a first fastening connector, the second central through hole is provided with a replaceable second fastening connector to adjust the length of the head of the second fastening connector; the first central through hole and the second central through hole are connected. The adjustment device can finely adjust the seal gap, reduce the difficulty of maintenance and adjustment, and speed up the maintenance progress.

[0004] However, the existing steam turbine steam seal structure is not convenient for cleaning and cooling during use. The thermal stress and carbide generated by the operation of the equipment accumulate together, which easily shortens the service life of the seal structure and reduces the operating efficiency of the equipment. Utility Model Content

[0005] The utility model provides a turbine steam seal structure with adjustable gap, which has the advantage of easy cleaning of the seal structure, so as to solve the problem that thermal stress and carbide accumulated during the operation of the existing equipment easily shorten the service life of the seal structure and reduce the operation efficiency of the equipment.

[0006] For the purpose of facilitating the real-time monitoring of the stability of the flue duct plate during installation and transportation, the present utility model provides the following technical solution: A steam seal structure with adjustable gaps, comprising a fixed frame and a sealing housing arranged on the fixed frame. A fixed square rod is fixedly connected to the top of the fixed frame, and further includes: A steam control valve arranged on the top of the fixed square rod. One side of the steam control valve is threadedly connected with a delivery pipe through a screw, and the other side of the steam control valve is threadedly connected with a steam flushing mechanism through a screw. The steam flushing mechanism includes a connection head, a filter screen, a flushing pipe, and a nozzle; A fixed ring arranged on the inner wall of the sealing housing. A plurality of gap adjustable mechanisms are fixedly connected to the inner wall of the fixed ring. The gap adjustable mechanism includes a fixed square plate, a sliding block, a fixed rod, and an adjusting spring; A dynamic ring arranged inside the fixed ring. A plurality of shock absorption and adjustment mechanisms are fixedly connected to the surface of the dynamic ring. The shock absorption and adjustment mechanism includes a fixed plate A, a shock absorption spring, and a fixed plate B. A shaft seal ring is arranged on the inner wall of the dynamic ring. A honeycomb layer is fixedly connected to the inner wall of the shaft seal ring.

[0007] As a preferred technical solution of the present utility model, the connection head is threadedly connected to one side of the steam control valve through a screw. The filter screen is fixedly connected to the inner wall of the connection head. The flushing pipe is communicated with the inside of the connection head. The nozzle is communicated with the bottom of the flushing pipe.

[0008] As a preferred technical solution of the present utility model, the fixed square plate is fixedly connected to the inner wall of the fixed ring. The sliding block is fixedly connected to the bottom of the fixed square plate. The fixed rod is fixedly connected to the bottom of the fixed square plate. The adjusting spring is fixedly connected to the bottom of the fixed rod.

[0009] As a preferred technical solution of the present utility model, the fixed plate A is fixedly connected to the surface of the dynamic ring. The shock absorption spring is fixedly connected to the surface of the fixed plate A. The fixed plate B is fixedly connected to the side of the shock absorption spring.

[0010] As a preferred technical solution of the present utility model, a plurality of limiting round holes are opened inside the dynamic ring. A plurality of limiting grooves are opened on both sides of the dynamic ring.

[0011] As a preferred technical solution of the present utility model, a plurality of heat dissipation fins are fixedly connected to the surface of the sealing housing. The side of the delivery pipe is communicated with clean steam.

[0012] As a preferred technical solution of the present utility model, a rotating shaft is rotatably connected to the inner wall of the shaft seal ring. A support plate is fixedly connected to the surface of the fixed frame.

[0013] As a preferred technical solution of the present utility model, a plurality of placement grooves are opened on the inner wall of the shaft seal ring. A plurality of placement blocks are fixedly connected to the surface of the honeycomb layer.

[0014] Compared with the prior art, the utility model provides a steam seal structure with adjustable clearance, which has the following beneficial effects:

[0015] 1. For the steam seal structure with adjustable clearance, through the fixed ring arranged on the inner wall of the sealing housing, the clearance adjustable mechanism arranged on the inner wall of the fixed ring, the shock absorption and adjustment mechanism arranged on the surface of the dynamic ring and the honeycomb layer, during use, the fixed ring is fixed inside the sealing housing, and the shaft seal ring is installed around the rotating shaft, and the shaft seal ring contacts the surface of the rotating shaft. Due to the radial position change and thermal expansion of the shaft generated during operation, the adjusting spring and the shock absorption spring are stressed and move to change the distance between the dynamic ring and the fixed ring, ensuring that the shaft seal ring remains in close contact with the shaft during operation, thereby maintaining a stable sealing clearance, preventing steam from leaking out along the shaft. The honeycomb layer can provide a larger contact area and denser sealing points, so as to more effectively prevent the leakage of steam or other media. At the same time, the flexible design of the honeycomb structure can better adapt to axial displacement and slight vibration, provide more reliable sealing performance in high-temperature and high-pressure environments, reduce energy loss and improve the operation efficiency of the steam turbine.

[0016] 2. For the steam seal structure with adjustable clearance, through the steam control valve arranged on the top of the fixed rod and the steam flushing mechanism, during cleaning, the connector is threadedly connected with the flushing pipe, then the flushing pipe and the nozzle are threadedly connected with the sealing housing, and then external steam is introduced into the steam control valve through the delivery pipe and the steam control valve is started. The cooperation of the steam control valve and the nozzle can ensure that the steam can evenly flush the sealing clearance between the shaft seal rings, reduce the accumulation of thermal stress and carbides, extend the service life of the shaft seal rings, and improve the reliability and operation efficiency of the equipment. Brief Description of the Drawings

[0017] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 is a schematic diagram of the steam flushing mechanism structure of the utility model;

[0019] Figure 3 is a schematic diagram of the clearance adjustable mechanism structure of the utility model;

[0020] Figure 4 is a schematic diagram of the honeycomb layer structure of the utility model.

[0021] In the figure: 1. Fixed frame; 2. Sealed housing; 3. Fixed square rod; 4. Steam control valve; 5. Delivery pipe; 6. Steam flushing mechanism; 601. Connector; 602. Filter screen; 603. Flushing pipe; 604. Spray head; 7. Fixed ring; 8. Clearance adjustable mechanism; 801. Fixed square plate; 802. Sliding block; 803. Fixed rod; 804. Adjusting spring; 9. Dynamic ring; 10. Shock absorption adjusting mechanism; 1001. Fixed plate A; 1002. Shock absorption spring; 1003. Fixed plate B; 11. Shaft seal ring; 12. Honeycomb layer; 13. Heat dissipation fins; 14. Rotating shaft; 15. Support plate. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1-4 , the present invention discloses a steam seal structure with adjustable clearance for a steam turbine, including a fixed frame 1 and a sealed housing 2 arranged on the fixed frame 1. The top of the fixed frame 1 is fixedly connected with a fixed square rod 3, and further includes: a steam control valve 4 arranged on the top of the fixed square rod 3. One side of the steam control valve 4 is threadedly connected with a delivery pipe 5 through a screw, and the other side of the steam control valve 4 is threadedly connected with a steam flushing mechanism 6 through a screw. The steam flushing mechanism 6 includes a connector 601, a filter screen 602, a flushing pipe 603 and a spray head 604; a fixed ring 7 arranged on the inner wall of the sealed housing 2. The inner wall of the fixed ring 7 is fixedly connected with several groups of clearance adjustable mechanisms 8. The clearance adjustable mechanism 8 includes a fixed square plate 801, a sliding block 802, a fixed rod 803 and an adjusting spring 804; a dynamic ring 9 arranged inside the fixed ring 7. The surface of the dynamic ring 9 is fixedly connected with several shock absorption adjusting mechanisms 10. The shock absorption adjusting mechanism 10 includes a fixed plate A 1001, a shock absorption spring 1002 and a fixed plate B 1003. A shaft seal ring 11 is arranged on the inner wall of the dynamic ring 9, and a honeycomb layer 12 is fixedly connected to the inner wall of the shaft seal ring 11.

[0024] Specifically, the connector 601 is threadedly connected to one side of the steam control valve 4 through a screw, the filter screen 602 is fixedly connected to the inner wall of the connector 601, the flushing pipe 603 communicates with the inside of the connector 601, and the spray head 604 communicates with the bottom of the flushing pipe 603.

[0025] In this embodiment, the filter screen 602 can effectively filter solid particles, sediments or other impurities in the steam, prevent them from entering the nozzle 604 of the flushing system, improve the flushing efficiency. The nozzle 604 can evenly flush the steam into the sealing gap between the shaft seals 11, reduce the accumulation of thermal stress and carbides, and extend the service life of the shaft seals 11.

[0026] Specifically, the fixed square plate 801 is fixedly connected to the inner wall of the fixed ring 7, the sliding block 802 is fixedly connected to the bottom of the fixed square plate 801, the fixed rod 803 is fixedly connected to the bottom of the fixed square plate 801, and the adjusting spring 804 is fixedly connected to the bottom of the fixed rod 803.

[0027] In this embodiment, the sliding block 802 can limit the fixed square plate 801 to prevent the fixed square plate 801 from shifting. The adjusting spring 804 can adjust the distance between the dynamic ring 9 and the fixed ring 7, thereby changing the sealing gap between the shaft seal 11 and the shaft.

[0028] Specifically, the fixing plate A 1001 is fixedly connected to the surface of the dynamic ring 9, the shock-absorbing spring 1002 is fixedly connected to the surface of the fixing plate A 1001, and the fixing plate B 1003 is fixedly connected to the side of the shock-absorbing spring 1002.

[0029] In this embodiment, the shock-absorbing spring 1002 can absorb the vibration generated during the operation of the equipment, prevent the mechanical structure from being damaged, extend the service life of the equipment, and at the same time can adjust the sealing gap between the shaft seal 11 and the shaft to prevent steam from leaking out along the shaft.

[0030] Specifically, a number of limiting round holes are provided inside the dynamic ring 9, and a number of limiting grooves are provided on both sides of the dynamic ring 9.

[0031] A number of heat dissipation fins 13 are fixedly connected to the surface of the sealing housing 2, and clean steam is communicated with the side of the delivery pipe 5.

[0032] Specifically, a rotating shaft 14 is rotatably connected to the inner wall of the shaft seal 11, and a support plate 15 is fixedly connected to the surface of the fixed frame 1.

[0033] A number of placement grooves are provided on the inner wall of the shaft seal 11, and a number of placement blocks are fixedly connected to the surface of the honeycomb layer 12.

[0034] In this embodiment, the heat dissipation fins 13 can increase the heat exchange surface area, reduce the temperature of the housing, improve the stability and efficiency of the sealing system. The honeycomb layer 12 can provide a larger contact area and more dense sealing points, so as to be able to more effectively prevent the leakage of steam or other media.

[0035] Working principle and usage process of the present utility model: When in use, the fixing ring 7 is fixed inside the sealing housing 2, and the shaft seal ring 11 is installed around the rotating shaft 14. The shaft seal ring 11 is in contact with the surface of the rotating shaft 14. Due to the radial position change and thermal expansion of the shaft generated during operation, the adjusting spring 804 and the shock-absorbing spring 1002 are forced to move, changing the distance between the dynamic ring 9 and the fixing ring 7, ensuring that the shaft seal ring 11 remains in close contact with the shaft during operation, thereby maintaining a stable sealing gap.

[0036] When cleaning, thread the connector 601 and the flushing pipe 603 together, then thread the flushing pipe 603 and the nozzle 604 onto the sealing housing 2, and then introduce external steam into the steam control valve 4 through the delivery pipe 5 and start the steam control valve 4.

[0037] In summary, for the steam seal structure of the steam turbine with adjustable gap, through the fixing ring 7 provided on the inner wall of the sealing housing 2, the gap-adjustable mechanism 8 provided on the inner wall of the fixing ring 7, the shock-absorbing and adjusting mechanism 10 provided on the surface of the dynamic ring 9, and the honeycomb layer 12, it is ensured that the shaft seal ring 11 remains in close contact with the shaft during operation, thereby maintaining a stable sealing gap and preventing steam from leaking axially along the shaft. The honeycomb layer 12 can provide a larger contact area and denser sealing points, thus being able to more effectively prevent the leakage of steam or other media. At the same time, the flexible design of the honeycomb structure can better adapt to axial displacement and slight vibrations, providing more reliable sealing performance in high-temperature and high-pressure environments, reducing energy loss and improving the operating efficiency of the steam turbine. The combined use of the steam control valve 4 and the nozzle 604 can ensure that steam can evenly flush the sealing gap between the shaft seal rings 11, reduce the accumulation of thermal stress and carbides, extend the service life of the shaft seal rings 11, and improve the reliability and operating efficiency of the equipment.

[0038] It should be noted that in this article, terms such as "including", "comprising", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article, or device including the said element.

[0039] Although the embodiments of the present utility model 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 utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A steam turbine seal structure with adjustable clearance, comprising a fixing frame (1) and a sealing shell (2) arranged on the fixing frame (1), wherein a fixing square rod (3) is fixedly connected to the top of the fixing frame (1), characterized in that: Also includes: A steam control valve (4) is arranged on the top of the fixed square rod (3), one side of the steam control valve (4) is connected to a delivery pipe (5) via a screw thread, and the other side of the steam control valve (4) is connected to a steam flushing mechanism (6) via a screw thread, and the steam flushing mechanism (6) comprises a connector (601), a filter screen (602), a flushing pipe (603) and a nozzle (604); A fixing ring (7) is arranged on the inner wall of the sealing housing (2), the inner wall of the fixing ring (7) being fixedly connected to a plurality of sets of gap adjustable mechanisms (8), the gap adjustable mechanisms (8) comprising a fixing square plate (801), a sliding block (802), a fixing rod (803) and an adjusting spring (804); A dynamic ring (9) is arranged inside the fixed ring (7), the surface of the dynamic ring (9) being fixedly connected to a plurality of shock absorbing adjustment mechanisms (10), the shock absorbing adjustment mechanisms (10) comprising a fixed plate A (1001), a shock absorbing spring (1002) and a fixed plate B (1003), a shaft sealing ring (11) being arranged on the inner wall of the dynamic ring (9), the inner wall of the shaft sealing ring (11) being fixedly connected to a honeycomb layer (12).

2. The gap-adjustable steam turbine seal structure according to claim 1, characterized in that: The connector (601) is connected to one side of the steam control valve (4) via a screw thread, the filter screen (602) is fixedly connected to the inner wall of the connector (601), the flushing pipe (603) is connected to the inside of the connector (601), and the nozzle (604) is connected to the bottom of the flushing pipe (603).

3. The gap-adjustable steam turbine seal structure according to claim 1, characterized in that: The fixed square plate (801) is fixedly connected to the inner wall of the fixed ring (7), the sliding block (802) is fixedly connected to the bottom of the fixed square plate (801), the fixed rod (803) is fixedly connected to the bottom of the fixed square plate (801), and the adjustment spring (804) is fixedly connected to the bottom of the fixed rod (803).

4. The gap-adjustable steam turbine seal structure according to claim 1, characterized in that: The fixing plate A (1001) is fixedly connected to the surface of the dynamic ring (9), the shock absorbing spring (1002) is fixedly connected to the surface of the fixing plate A (1001), and the fixing plate B (1003) is fixedly connected to the side of the shock absorbing spring (1002).

5. The gap-adjustable steam turbine seal structure according to claim 1, characterized in that: A plurality of limiting circular holes are provided inside the dynamic ring (9), and a plurality of limiting grooves are provided on both sides of the dynamic ring (9).

6. The gap-adjustable steam turbine seal structure according to claim 1, characterized in that: A plurality of heat dissipation fins (13) are fixedly connected to the surface of the sealed housing (2), and the side of the delivery pipe (5) is connected to clean steam.

7. The gap-adjustable steam turbine seal structure according to claim 1, characterized in that: The inner wall of the shaft sealing ring (11) is rotatably connected to a rotating shaft (14), and the surface of the fixing frame (1) is fixedly connected to a supporting plate (15).

8. The gap-adjustable steam turbine seal structure according to claim 1, characterized in that: The inner wall of the shaft sealing ring (11) is provided with a plurality of placement grooves, and the surface of the honeycomb layer (12) is fixedly connected with a plurality of placement blocks.

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