A carbon deposition prevention device for a steam turbine bearing box oil retaining ring

Abstract

The utility model discloses a steam turbine bearing box oil retaining ring prevents carbon deposit device, and this prevents carbon deposit device includes board body structure, guide structure, inlet and outlet air structure, the board body structure number is two, and is fixed through welding, the guide structure is fixed on every board body structure, and the guide structure constitutes a airflow channel on the board body, the inlet and outlet air structure with the airflow channel intercommunication of guide structure, and form single air inlet and air outlet at the head and tail of airflow channel respectively, through the design of the utility model, add heat insulating device in the steam turbine middle pressure cylinder end face, and design the airflow channel in the inside, the device takes compressed air as cooling medium, when the compressed air flows through these channels, will efficiently take away the radiant heat of steam turbine middle pressure cylinder end face, effectively reduces the heat radiation intensity of middle pressure cylinder end face to bearing box oil retaining ring, avoids the heat transfer to bearing box oil retaining ring, prevents the carbon deposit of oil smoke at the oil retaining ring.

Description

Technical Field

[0001] This utility model belongs to the technical field of turbine bearing housing accessories, specifically relating to a device for preventing carbon buildup on the oil baffle ring of a turbine bearing housing. Background Technology

[0002] In large thermal power plants, steam turbine units are the core power equipment, and their stable operation directly affects the overall production efficiency and safety of the power plant. However, some steam turbine units are currently facing a thorny problem: frequent malfunctions at the oil baffle rings of the turbine unit bearing housings.

[0003] Due to design or installation factors, the distance between the bearing housing and the intermediate pressure cylinder end face is relatively tight. During normal operation of the turbine unit, the intermediate pressure cylinder operates under high temperature and high pressure, and its end face releases a large amount of heat radiation. This heat radiation is transferred unimpeded to the adjacent bearing housing oil baffle ring. Over time, the temperature of the oil baffle ring remains consistently high, far exceeding its normal operating temperature range.

[0004] The high-temperature environment causes the lubricating oil in the bearing housing to evaporate, generating a large amount of oil fumes. As these fumes pass through the sealing teeth of the oil baffle ring, impurities gradually deposit due to the structural characteristics of the sealing teeth and the high temperature, forming carbon deposits. Over time, these carbon deposits accumulate and gradually occupy the gap between the turbine rotor and the oil baffle ring in the bearing housing, causing the originally reasonable gap to continuously decrease or even disappear completely.

[0005] Once the clearance disappears, the turbine rotor will rub against the bearing housing oil retainer ring during high-speed rotation. This rubbing will generate severe vibration, causing the shaft vibration amplitude to exceed the standard range. Both rubbing and excessive vibration not only accelerate equipment wear and shorten its service life, but also pose a serious threat to the safe operation of the entire turbine generator set, potentially leading to major equipment failures, huge economic losses, and safety hazards. Utility Model Content

[0006] The purpose of this utility model is to provide a device for preventing carbon buildup on the oil baffle ring of a turbine bearing housing, so as to solve the problems mentioned in the background art, such as the bearing housing being close to the end face of the intermediate pressure cylinder, heat radiation causing high temperature of the oil baffle ring, oil fume carbon buildup, reduced clearance leading to rubbing, and excessive shaft vibration threatening the safety of the unit.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a device for preventing carbon buildup on an oil baffle ring of a steam turbine bearing housing, the device comprising a plate structure, a guide structure, and an inlet / outlet structure;

[0008] The plate structure consists of two parts, which are fixed together by welding.

[0009] The guide structure is fixed on each plate structure, and the guide structure forms an airflow channel on the plate.

[0010] The air inlet and outlet structures are connected to the airflow channels of the guide structure, and a single air inlet and outlet are formed at the beginning and end of the airflow channels, respectively.

[0011] As a preferred technical solution of this utility model, the plate structure includes an upper bottom plate and a lower bottom plate, both of which are made of stainless steel plate;

[0012] The upper and lower base plates have arc-shaped cross-sections, and when spliced ​​together, they form a complete circular structure, which can be matched with the oil baffle ring of the bearing housing and connected to it.

[0013] As a preferred technical solution of this utility model, the guiding structure is a flow guide plate, the outer wall of the flow guide plate coincides with the outer wall paths of the upper bottom plate and the lower bottom plate, and the upper bottom plate and the flow guide plate, as well as the lower bottom plate and the flow guide plate, each form an independent airflow channel.

[0014] As a preferred technical solution of this utility model, the airflow channel formed by the upper bottom plate and the guide plate, and the lower bottom plate and the guide plate, has only a single flow path.

[0015] As a preferred technical solution of this utility model, the air inlet and outlet structure includes an air inlet pipe and an air outlet pipe;

[0016] The air intake pipe is installed at one end of the guide plate and is connected to the first end of the airflow channel, while the air outlet pipe is installed at the other end of the guide plate and is connected to the end of the airflow channel.

[0017] In use, compressed air is injected into the intake pipe as a cooling medium. The gas then passes through the airflow channel formed by the guide plate and the upper base plate, and the guide plate and the lower base plate. This airflow channel effectively exchanges heat between the cold source compressed air and the high-temperature area corresponding to the bearing housing oil baffle ring, preventing carbon buildup on the turbine bearing housing oil baffle ring due to excessive temperature. The cooled gas is then discharged from the outlet pipe.

[0018] As a preferred technical solution of this utility model, a connection port is formed at both the first and last ends of the guide plate, and the air inlet pipe and air outlet pipe pass through the connection port into the airflow channel.

[0019] As a preferred technical solution of this utility model, the mating surfaces of the upper base plate and the lower base plate are fixed by welding, and the guide plate is fixed to both the upper base plate and the lower base plate by welding, thereby ensuring installation stability.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] This invention adds a heat insulation device to the end face of the intermediate pressure cylinder of a steam turbine and designs an airflow channel inside. The device uses compressed air as a cooling medium. When the compressed air flows through these channels, it efficiently removes the radiant heat emitted from the end face of the intermediate pressure cylinder of the steam turbine, effectively reducing the heat radiation intensity of the intermediate pressure cylinder end face to the bearing housing oil baffle ring, preventing heat transfer to the bearing housing oil baffle ring, and preventing the disappearance of the gap between the steam turbine rotor and the oil baffle ring due to oil fume carbon buildup at the oil baffle ring. This avoids dynamic and static rubbing and the resulting rotor vibration problems, ensuring the safe and stable operation of the steam turbine. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a rear view of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the bottom plate of this utility model;

[0025] Figure 4 This utility model Figure 3 Top view after removing the intake and exhaust pipes;

[0026] Figure 5 This is a schematic diagram of the structure of the guide plate of this utility model.

[0027] In the picture:

[0028] 100. Top plate;

[0029] 200. Bottom plate;

[0030] 300. Deflector plate;

[0031] 401. Intake pipe; 402. Exhaust pipe;

[0032] 500. Connection port. Detailed Implementation

[0033] 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.

[0034] Please see Figures 1 to 5This utility model provides a technical solution: a device for preventing carbon buildup on the oil baffle ring of a steam turbine bearing housing. The device consists of three main parts: a plate structure, a guide structure, and an air inlet and outlet structure. Each part is compact and reasonably designed, and together they achieve the function of preventing carbon buildup on the oil baffle ring.

[0035] There are two plate structures, which are fixed together by welding.

[0036] The guide structure is fixed on each plate structure, and the guide structure forms an airflow channel on the plate.

[0037] The airflow channels of the inlet and outlet structures and the guide structures are connected, and a single air inlet and outlet are formed at the beginning and end of the airflow channels, respectively.

[0038] In this embodiment, preferably, the plate structure includes an upper bottom plate 100 and a lower bottom plate 200, both of which are made of 5 mm thick 304 stainless steel plates. 304 stainless steel has good corrosion resistance and high temperature resistance, and can operate stably for a long time in the high temperature and high pressure steam turbine working environment.

[0039] The upper base plate 100 and the lower base plate 200 both have arc-shaped cross sections. This arc-shaped design can better fit the shape of the turbine bearing housing oil baffle ring, ensuring a tight connection between the device and the oil baffle ring. After splicing, the two form a complete circular structure. The inner diameter of the circular structure matches the outer diameter of the bearing housing oil baffle ring, so that it can be stably installed on the oil baffle ring.

[0040] During the assembly process, the mating surfaces of the upper base plate 100 and the lower base plate 200 are fixed by welding. Argon arc welding is used to ensure welding quality and sealing, preventing air leakage. Before welding, the welding surfaces of the upper and lower base plates need to be cleaned to remove oil, oxide layers, and other impurities to ensure welding quality. During welding, the welding current, voltage, and welding speed must be carefully controlled to ensure a uniform, strong weld free of defects such as porosity and cracks.

[0041] In this embodiment, preferably, the guiding structure is a guide plate 300. The outer wall of the guide plate 300 coincides with the outer wall paths of the upper base plate 100 and the lower base plate 200. An independent airflow channel is formed between the upper base plate 100 and the guide plate 300, and between the lower base plate 200 and the guide plate 300. When installing the guide plate 300, a special fixture is required for positioning to ensure the accurate relative position of the guide plate 300 with the upper and lower base plates. After welding, the airflow channel must be checked for ventilation to ensure there are no blockages or leaks.

[0042] In this embodiment, preferably, the airflow channel formed by the upper base plate 100 and the guide plate 300, and the lower base plate 200 and the guide plate 300 has only a single flow path. This single flow path design can ensure that the compressed air flows smoothly in the channel and avoid airflow turbulence, thereby improving cooling efficiency.

[0043] In this embodiment, preferably, the air inlet and outlet structure includes an air inlet pipe 401 and an air outlet pipe 402;

[0044] The intake pipe 401 is installed at one end of the guide plate 300 and is connected to the first end of the airflow channel, while the exhaust pipe 402 is installed at the other end of the guide plate 300 and is connected to the end of the airflow channel.

[0045] In use, compressed air is injected into the intake pipe 401 as a cooling medium. Then the gas passes through the airflow channel formed by the guide plate 300 and the upper base plate 100, and the guide plate 300 and the lower base plate 200. This airflow channel effectively exchanges heat between the cold source compressed air and the high-temperature area corresponding to the bearing housing oil baffle ring, avoiding carbon buildup on the turbine bearing housing oil baffle ring due to excessive temperature. The cooled gas is then discharged from the exhaust pipe 402.

[0046] In this embodiment, preferably, a connection port 500 is formed at both the first and last ends of the guide plate 300. The inlet pipe 401 and the outlet pipe 402 pass through the connection port 500 into the airflow channel. The size of the connection port 500 must be compatible with the outer diameter of the inlet pipe 401 and the outlet pipe 402, and a sealing weld is used to prevent compressed air leakage. Simultaneously, when installing the inlet pipe 401 and the outlet pipe 402, a suitable bevel needs to be machined at the connection port 500 to ensure the quality of the sealing weld. Furthermore, the ends of the inlet pipe 401 and the outlet pipe 402 need to be ground to remove burrs and flash to prevent damage to the seals. The compressed air pressure is generally controlled between 0.5MPa and 0.8MPa. This pressure range ensures sufficient power for the compressed air to flow within the airflow channel while avoiding damage to the device due to excessive pressure. The compressed air flow rate also needs to be controlled, generally determined based on the turbine's power and operating conditions. The flow rate of compressed air can be adjusted by installing a flow regulating valve on the intake pipe 401 to ensure optimal cooling. At the same time, the quality of the compressed air must be monitored to ensure it is dry and oil-free, preventing impurities in the compressed air from affecting the normal operation of the device.

[0047] In this embodiment, preferably, the mating surfaces of the upper base plate 100 and the lower base plate 200 are fixed by welding, and the guide plate 300 is fixed to both the upper base plate 100 and the lower base plate 200 by welding, thereby ensuring installation stability. After installation, a comprehensive inspection should be carried out to ensure that all components are installed correctly and connected firmly. During the commissioning phase, the compressed air source should be turned on slowly first, and the operation of the device should be observed to check for problems such as air leakage and poor airflow. At the same time, the temperature change of the bearing housing oil baffle ring should be monitored, and the pressure and flow rate of the compressed air should be adjusted according to the temperature until the optimal cooling effect is achieved.

[0048] Although embodiments of the present invention have been shown and described (see the detailed description above), 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. A carbon deposition preventing device for a steam turbine bearing chamber oil retaining ring, characterized by: The anti-carbon buildup device includes a plate structure, a guiding structure, and an air inlet / outlet structure; The plate structure consists of two parts, which are fixed together by welding. The guide structure is fixed on each plate structure, and the guide structure forms an airflow channel on the plate. The air inlet and outlet structures are connected to the airflow channels of the guide structure, and a single air inlet and outlet are formed at the beginning and end of the airflow channels, respectively.

2. A carbon deposition preventing device for a turbine bearing box oil retaining ring according to claim 1, characterized in that: The plate structure includes an upper base plate (100) and a lower base plate (200); The upper base plate (100) and the lower base plate (200) have arc-shaped cross sections, and the two form a complete circular structure after being spliced ​​together.

3. A carbon deposition preventing device for a turbine bearing box oil retaining ring according to claim 2, characterized in that: The guiding structure is a flow guide plate (300). The outer wall of the flow guide plate (300) coincides with the outer wall paths of the upper bottom plate (100) and the lower bottom plate (200). An independent airflow channel is formed on the upper bottom plate (100) and the flow guide plate (300), and on the lower bottom plate (200) and the flow guide plate (300).

4. A carbon deposition preventing device for a turbine bearing box oil retaining ring according to claim 3, characterized in that: The airflow channels formed by the upper base plate (100) and the guide plate (300), and the lower base plate (200) and the guide plate (300) have only a single flow path.

5. A carbon deposition preventing device for a turbine bearing box oil retaining ring according to claim 3, characterized in that: The air inlet and outlet structure includes an air inlet pipe (401) and an air outlet pipe (402); The air intake pipe (401) is installed at one end of the guide plate (300) and is connected to the first end of the airflow channel, while the air outlet pipe (402) is installed at the other end of the guide plate (300) and is connected to the end of the airflow channel.

6. A carbon deposition preventing device for a turbine bearing box oil retaining ring according to claim 5, characterized in that: The guide plate (300) has a connection port (500) at both the first and last ends, and the air inlet pipe (401) and air outlet pipe (402) pass through the connection port (500) into the airflow channel.

7. A carbon deposition preventing device for a turbine bearing box oil retaining ring according to claim 1, characterized in that: The mating surfaces of the upper base plate (100) and the lower base plate (200) are fixed by welding, and the guide plate (300) is fixed to both the upper base plate (100) and the lower base plate (200) by welding.

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