Steam seal device of steam turbine

Abstract

The utility model provides a steam seal device of a steam turbine, which relates to the technical field of steam turbines and comprises an isolation shell, and a steam turbine main body is mounted on the inner wall of the isolation shell. The steam leakage is effectively prevented through the isolation shell, energy waste can be avoided, the safety of the operation environment can be remarkably improved, operators are prevented from being hurt by high-temperature steam, when the steam leaks, the air bag is finally extruded and broken through mechanical linkage, and the steam leakage is avoided. When leakage occurs, generated noise can immediately remind workers to pay attention, the real-time early warning system can ensure that the workers can quickly respond to prevent accidents from expanding when leakage occurs, and under the default condition, due to the tension effect of the tension spring, the top plate can be pulled to move downwards to drive the baffle to reset, so that the safety of the workers is guaranteed. By means of the design, the device can automatically recover to the initial state after giving out early warning, and convenience is provided for follow-up monitoring and repairing work.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a steam seal device for a steam turbine. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power plants. A sealing device is provided between the moving and static parts of the steam turbine shaft system, usually called a steam seal. The number of steam turbines in modern nuclear power plants is increasing rapidly, so a good steam seal device is of great significance to steam turbines.

[0003] Publication No. CN219932261U discloses a steam turbine steam seal device, comprising an isolation shell, a steam turbine body is arranged inside the isolation shell, a steam inlet pipe and a transmission shaft are respectively arranged on both sides of the steam turbine body, the steam inlet pipe and the transmission shaft both extend out of the isolation shell, sealing rings are fixedly connected to positions near the steam inlet pipe and the transmission shaft on both sides of the outer wall of the steam turbine body, an absorption sponge is fixedly connected to a position near the transmission shaft on one side of the inner wall of the isolation shell, the surface of the absorption sponge is covered with a dryer, a steam collecting shell is fixedly connected to the top surface of the isolation shell, an air pump is arranged on the inner wall of the steam collecting shell, a pipeline is fixedly connected to the top surface of the steam collecting shell, the other end of the pipeline is fixedly connected to a filter box, a condensate box and a collecting cylinder in sequence, a refrigeration device is fixedly connected to the top surface of the outer wall of the condensate box, and the output end of the refrigeration device passes through the top surface of the condensate box. Although this steam seal device is provided with an absorbent sponge at the contact position between the transmission shaft and the isolation shell to absorb the steam leaked from the sealing ring, the isolation shell is sealed, and the absorbent sponge can be continuously dried by the dryer for uninterrupted recycling. However, this steam seal device lacks an immediate and effective early warning system when steam leaks, resulting in the staff being unable to quickly know and respond when a leak occurs, which may expand the accident. Therefore, improvements are needed. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problems raised in the above background technology.

[0005] The utility model adopts the following technical scheme: a steam turbine steam seal device, comprising an isolation shell, an inner wall of the isolation shell is installed with a turbine body, one end of the turbine body is connected with a steam inlet pipe, and the other end of the turbine body is installed with a transmission shaft, a sliding rod is penetrated through the top surface of the isolation shell, a stopper is fixedly installed at one end of the sliding rod, a top plate is fixedly installed at the other end of the sliding rod, a tension spring is sleeved on the surface of the sliding rod, a mounting frame is fixedly installed on the top surface of the isolation shell, and an airbag is fixedly installed on the inner side of the mounting frame.

[0006] Preferably, the sliding rod is slidably connected to the isolation shell, and the stopper is made of austenitic stainless steel.

[0007] Preferably, a mounting plate is fixedly mounted on the bottom surface of the isolation shell, and the mounting plates are symmetrically distributed on the bottom surface of the isolation shell.

[0008] Preferably, one end of the tension spring is fixedly connected to the top plate, and the other end of the tension spring is fixedly connected to the isolation housing. Here, the tension spring can be stably installed.

[0009] Preferably, the mounting frame is a "U"-shaped structure, and the mounting frame is made of ferritic stainless steel.

[0010] Preferably, an inner shell is fixedly mounted on the inner wall of the isolation shell, the steam turbine body is arranged on the inner wall of the inner shell, a cooling pipeline is fixedly mounted on the side of the inner shell, one end of the cooling pipeline is connected to a water inlet pipe, and the other end of the cooling pipeline is connected to a water outlet pipe. Here, the sealing effect can be improved.

[0011] Preferably, one end of the water inlet pipe and the water outlet pipe are fixedly mounted with a connecting flange, and the cooling pipeline is fitted with the inner shell.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are:

[0013] 1. The utility model effectively prevents steam leakage by isolating the shell, which not only avoids energy waste, but also significantly improves the safety of the operating environment and prevents operators from being harmed by high-temperature steam. When steam leaks, the airbag is eventually squeezed and ruptured through mechanical linkage, and the noise generated can immediately alert the staff. This instant early warning system can ensure that when a leak occurs, the staff can respond quickly to prevent the accident from expanding. In the default case, due to the tension of the tension spring, the top plate will be pulled downward, thereby driving the baffle to reset. This design enables the device to automatically return to its initial state after issuing an early warning, which provides convenience for subsequent monitoring and repair work.

[0014] 2. The utility model can more effectively prevent steam leakage by setting up a double-layer structure of an inner shell and an isolation shell. This double-layer protection improves the tightness of the steam seal, thereby ensuring the working efficiency and safety of the steam turbine. By connecting cold water to the water inlet pipe and allowing it to flow through the cooling pipeline, the inner shell is continuously cooled, which can effectively prevent the inner shell from expanding due to overheating, thereby avoiding the decline in sealing performance or structural damage caused by thermal expansion and contraction. At the same time, cooling the inner shell can not only prevent its overheating expansion, but also reduce fatigue damage to the material caused by thermal stress, thereby extending the service life of the inner shell and the entire steam seal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a steam turbine steam seal device is provided for the utility model;

[0016] Figure 2 A cross-sectional view of a steam turbine steam seal device is proposed for the utility model;

[0017] Figure 3 A steam turbine seal device is proposed for the utility model Figure 2 Enlarged view of point A in the middle;

[0018] Figure 4 The utility model provides a side-angle sectional view of a steam turbine steam seal device.

[0019] Legend:

[0020] 1. Isolation shell; 2. Steam turbine body; 3. Steam inlet pipe; 4. Drive shaft; 5. Slide rod; 6. Block; 7. Top plate; 8. Tension spring; 9. Mounting frame; 10. Air bag; 11. Mounting plate; 12. Inner shell; 13. Cooling pipeline; 14. Water inlet pipe; 15. Water outlet pipe; 16. Connecting flange. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0022] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0023] Embodiment 1

[0024] See also Figure 1-4The utility model provides a technical solution: a steam turbine seal device, comprising an isolation shell 1, the bottom surface of which is fixedly installed with a mounting plate 11 by a stable bolt connection method, and the mounting plates 11 are symmetrically distributed on the bottom surface of the isolation shell 1, which enhances the overall stability. The inner wall of the isolation shell 1 is installed with a turbine body 2 by precise matching to ensure the smooth operation of the turbine. One end of the turbine body 2 is connected to a steam inlet pipe 3 through a professional interface to ensure smooth steam input. The other end of the turbine body 2 is installed with a transmission shaft 4 through a bearing, so that the turbine body 2 can effectively drive the transmission shaft 4 to rotate. A sliding rod 5 is provided through the top surface of the isolation shell 1, and the sliding rod 5 adopts a precise sliding match, which not only ensures the smoothness of sliding, but also effectively prevents steam leakage. A stopper 6 is fixedly installed at one end of the sliding rod 5 by welding, and the stopper 6 is specially selected from austenitic stainless steel. This material is not only strong and durable, but also has excellent corrosion resistance, and is very suitable for use in high temperature and high humidity steam environments.

[0025] See also Figure 3 , the other end of the slide bar 5 is also fixedly installed with a top plate 7 by welding, ensuring the stability of the structure. A tension spring 8 is sleeved on the surface of the slide bar 5, one end of the tension spring 8 is fixedly connected to the top plate 7 by a hook, and the other end is connected to the isolation shell 1 by a fixing seat. This connection method not only ensures the stable operation of the tension spring 8, but also facilitates future maintenance and replacement. The top surface of the isolation shell 1 is also fixedly installed with a mounting frame 9 by bolt connection. The mounting frame 9 is designed as a "U"-shaped structure, which not only improves the stability of the structure, but also facilitates the installation of the airbag 10. The mounting frame 9 is specially made of ferritic stainless steel. This material has good toughness while ensuring strength, and is very suitable for supporting and protecting the airbag 10. The airbag 10 is fixedly installed on the inner side of the mounting frame 9.

[0026] Embodiment 2

[0027] See also Figure 4 , an inner shell 12 is fixedly mounted on the inner wall of the isolation shell 1, and the turbine body 2 is arranged on the inner wall of the inner shell 12, ensuring the effective use of steam and the stable operation of the turbine. A cooling pipeline 13 is fixedly mounted on the side of the inner shell 12, and this fixation can be achieved by a clamp or welding method to ensure the stability and sealing of the cooling pipeline 13. The cooling pipeline 13 fits tightly on the inner shell 12 to maximize the heat exchange efficiency. One end of the cooling pipeline 13 is connected to a water inlet pipe 14 for receiving cold water, and the other end is connected to a water outlet pipe 15 for discharging water that has absorbed heat. One end of the water inlet pipe 14 and the water outlet pipe 15 are fixedly mounted with a connecting flange 16. The flange connection not only ensures the sealing of the pipeline, but also facilitates the installation and disassembly of the pipeline.

[0028] Working principle: Steam enters through the steam inlet pipe 3 to drive the turbine body 2 to work, and the turbine body 2 can drive the transmission shaft 4 to rotate. The isolation shell 1 can prevent steam leakage, thereby improving safety. When steam leaks, the steam can push the stopper 6 to move, and the stopper 6 can then drive the slide bar 5 to move, and the slide bar 5 can then drive the top plate 7 to move. The top plate 7 can then squeeze the airbag 10 until the airbag 10 ruptures. The noise generated when the airbag 10 splits can alert the staff. In the default case, due to the tension of the tension spring 8, the tension spring 8 can pull the top plate 7 downward, thereby causing the baffle to move downward. , thereby making the top plate 7 away from the airbag 10. The utility model effectively prevents steam leakage by isolating the shell 1, which not only avoids energy waste, but also significantly improves the safety of the operating environment and prevents operators from being harmed by high-temperature steam. When steam leaks, the airbag 10 is finally squeezed and ruptured through mechanical linkage, and the noise generated can immediately alert the staff. This instant early warning system can ensure that when a leak occurs, the staff can respond quickly, thereby preventing the accident from expanding. By default, due to the tension of the tension spring 8, the top plate 7 will be pulled downward, thereby driving the baffle Reset, this design enables the device to automatically restore to its initial state after issuing an early warning, which provides convenience for subsequent monitoring and repair work, and the double-layer structure of the inner shell 12 and the isolation shell 1 can avoid steam leakage to the greatest extent and ensure the steam sealing effect. At the same time, cold water can be connected to the water inlet pipe 14, and then the cold water can enter the cooling pipeline 13. At this time, the inner shell 12 can be cooled through the cooling pipeline 13, and then the cold water can be discharged from the water outlet pipe 15 after it becomes hot. By cooling the inner shell 12, the inner shell 12 can be prevented from overheating and expanding, thereby increasing the service life of the inner shell 12. The double-layer structure of the inner shell 12 and the isolation shell 1 can more effectively prevent steam leakage. This double-layer protection improves the tightness of the steam seal, thereby ensuring the working efficiency and safety of the steam turbine. By connecting cold water to the water inlet pipe 14 and allowing it to flow through the cooling pipeline 13, the inner shell 12 is continuously cooled, which can effectively prevent the inner shell 12 from expanding due to overheating, thereby avoiding the degradation of sealing performance or structural damage caused by thermal expansion and contraction. At the same time, cooling the inner shell 12 can not only prevent its overheating expansion, but also reduce fatigue damage to the material caused by thermal stress, thereby extending the service life of the inner shell 12 and the entire steam seal device.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A steam turbine seal device, comprising an isolation casing (1), characterized in that: A steam turbine body (2) is installed on the inner wall of the isolation shell (1), one end of the steam turbine body (2) is connected to a steam inlet pipe (3), and the other end of the steam turbine body (2) is installed with a transmission shaft (4). A slide bar (5) is provided through the top surface of the isolation shell (1), a stopper (6) is fixedly installed on one end of the slide bar (5), and a top plate (7) is fixedly installed on the other end of the slide bar (5). A tension spring (8) is sleeved on the surface of the slide bar (5), and a mounting frame (9) is fixedly installed on the top surface of the isolation shell (1), and an air bag (10) is fixedly installed on the inner side of the mounting frame (9).

2. The steam turbine seal device according to claim 1, characterized in that: The sliding rod (5) is slidably connected to the isolation shell (1), and the material of the stopper (6) is austenitic stainless steel.

3. The steam turbine seal device according to claim 1, characterized in that: A mounting plate (11) is fixedly mounted on the bottom surface of the isolation shell (1), and the mounting plates (11) are symmetrically distributed on the bottom surface of the isolation shell (1).

4. The steam turbine seal device according to claim 1, characterized in that: One end of the tension spring (8) is fixedly connected to the top plate (7), and the other end of the tension spring (8) is fixedly connected to the isolation shell (1).

5. The steam turbine seal device according to claim 1, characterized in that: The mounting frame (9) is a "U"-shaped structure, and the mounting frame (9) is made of ferritic stainless steel.

6. The steam turbine seal device according to claim 1, characterized in that: An inner shell (12) is fixedly mounted on the inner wall of the isolation shell (1), the steam turbine body (2) is arranged on the inner wall of the inner shell (12), a cooling pipeline (13) is fixedly mounted on the side of the inner shell (12), one end of the cooling pipeline (13) is connected to a water inlet pipe (14), and the other end of the cooling pipeline (13) is connected to a water outlet pipe (15).

7. The steam turbine seal device according to claim 6, characterized in that: One end of the water inlet pipe (14) and the water outlet pipe (15) are both fixedly mounted with a connecting flange (16), and the cooling pipeline (13) is in close contact with the inner shell (12).

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