Lubricating device for shaft body of steam turbine

Abstract

The invention discloses a steam turbine shaft body lubricating device which comprises a steam turbine body, a lubricator is installed on the steam turbine body, the lubricator comprises a lubricating box, a U-shaped siphon is installed on the lubricating box and connected to the steam turbine body, and an expansion air bag is installed on the inner side of the lubricating box and connected to the steam turbine body. The invention relates to the technical field of steam turbines, pressure intensity driving and an air bag expansion mechanism which are precisely coordinated by a controller are matched with a U-shaped siphon, so that on-demand and quantitative automatic lubrication is realized, the lubrication precision and controllability are remarkably improved, and the problem of insufficient or excessive lubrication is effectively avoided; and through the design of the arc flow dividing pipe and the multiple drainage pipes with the overturning plates, it is ensured that lubricating oil can uniformly and comprehensively cover the surface of the shaft body, and the uniformity and reliability of lubricating are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, and in particular to a steam turbine shaft lubrication device. Background Technology

[0002] During the operation of a steam turbine, reliable lubrication of key friction components such as the main shaft bearings is crucial, directly affecting the stability, efficiency, and service life of the equipment. Traditional steam turbine shaft lubrication methods often employ independent forced oil supply systems or simple splash lubrication. These existing technologies have several drawbacks: First, the precision and controllability of lubrication are poor. Many lubrication systems lack on-demand, precise lubrication control, often employing continuous or simple intermittent lubrication modes. This can lead to over-lubrication under low-load conditions, resulting in oil waste and equipment contamination; while under high-load or transient conditions, insufficient lubrication may occur, posing a risk of shaft overheating or wear. Existing systems struggle to achieve intelligent lubrication regulation that matches the actual operating conditions of the turbine (such as speed and temperature) in real time.

[0003] Secondly, lubrication uniformity and coverage are insufficient. Traditional single-point or multi-point lubrication methods cannot ensure that the lubricating oil forms a uniform and complete oil film on the surface of the high-speed rotating shaft. This problem is particularly prominent for steam turbines with long shaft systems or multiple support points, affecting the overall lubrication effect and reliability. In view of this, in-depth research was conducted to address the above problems, leading to this case. Summary of the Invention

[0004] The technical solution of the present invention to achieve the above objectives is as follows: a turbine shaft lubrication device, comprising a turbine body, a lubricator installed on the turbine body, the lubricator including a lubrication box, a U-shaped siphon pipe installed on the lubrication box and connected to the turbine body, an expansion air bladder installed inside the lubrication box, a pressure box installed on the side wall of the lubrication box, the pressure box being connected to the lubrication box and the expansion air bladder via a three-way valve, a pressure threaded pipe installed on the pressure box, the pressure threaded pipe being inserted into the lubrication box via a bearing, a pressure threaded rod installed inside the pressure threaded pipe, a pressure extrusion plate installed on the pressure threaded rod, a gear set installed on the lubrication box, the gear set being fitted onto the pressure threaded pipe via a bearing, a pressure drive motor installed on the gear set, and a bevel gear set installed on the pressure drive motor and the pressure threaded pipe.

[0005] Preferably, an arc-shaped diverter pipe is installed on the turbine body, the arc-shaped diverter pipe is inserted into the inner side of the turbine body, the arc-shaped drain pipe is connected to a U-shaped siphon pipe, multiple arc-shaped drain pipes are installed on the arc-shaped diverter pipe, an arc-shaped flip plate is installed on the arc-shaped drain pipe, the arc-shaped flip plate is inserted into the inner side of the arc-shaped drain pipe through a flip shaft, and a horn-shaped rubber ring is installed between the arc-shaped drain pipe and the arc-shaped flip plate.

[0006] Preferably, the pressure drive is a servo motor or a stepper motor; the three valves are electromagnetic control valves and are electrically connected to a controller.

[0007] Preferably, the top of the lubrication tank is provided with a liquid replenishment port and a pressure balance valve.

[0008] Preferably, the horn-shaped rubber ring is made of oil-resistant rubber material.

[0009] Preferably, an oil collection groove is provided at the bottom of the turbine body corresponding to the outlet position of the arc-shaped diversion pipe.

[0010] Preferably, the differential pressure regulating valve is an electric regulating valve and is signal-connected to the central controller for dynamically adjusting the opening degree according to the pressure changes in the combustion chamber.

[0011] Preferably, the lifting tension rope is made of high-temperature resistant steel wire rope, and the floating ball is made of high-temperature resistant buoyancy material.

[0012] Preferably, the three valves are three-way solenoid valves used to control the gas flow direction between the inflation control box and the combustion chamber.

[0013] Preferably, the central controller is also connected to a data storage module.

[0014] The turbine shaft lubrication device manufactured using the technical solution of this invention achieves on-demand and quantitative automated lubrication through a pressure drive and airbag expansion mechanism precisely coordinated by a controller, combined with a U-shaped siphon pipe. This significantly improves the accuracy and controllability of lubrication, effectively avoiding problems of insufficient or excessive lubrication. The design of the arc-shaped diversion pipe and multiple diversion pipes with flipping plates ensures that the lubricating oil can evenly and comprehensively cover the shaft surface, greatly improving the uniformity and reliability of lubrication. Simultaneously, its unique closed-loop circulation system (oil collection tank and return oil pipeline) enables the recycling and reuse of lubricating oil, saving oil, reducing operating costs, and avoiding environmental pollution. The entire device highly integrates drive, control, lubrication, and recycling functions, with a compact and reasonable structure, stable and reliable operation, improving lubrication efficiency while enhancing the protection of the turbine's core components, demonstrating excellent overall performance. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of a turbine shaft lubrication device according to the present invention.

[0016] Figure 2 This is a side view of the turbine shaft lubrication device according to the present invention.

[0017] In the diagram: 1. Steam turbine body; 2. Lubrication tank; 3. U-shaped siphon pipe; 4. Expansion air bladder; 5. Pressure tank; 6. Three-way valve; 7. Pressure threaded pipe; 8. Pressure threaded rod; 9. Pressure extrusion plate; 10. Gear set box; 11. Pressure drive motor; 12. Bevel gear set; 13. Arc-shaped diverter pipe; 14. Arc-shaped drain pipe; 15. Arc-shaped flip plate; 16. Flip shaft; 17. Horn-shaped rubber ring. Detailed Implementation

[0018] Example: Reliable lubrication of key friction components such as main shaft bearings is crucial in steam turbine operation. However, existing technologies such as forced oil supply or splash lubrication have significant shortcomings: First, the accuracy and controllability of lubrication are poor, making it difficult to supply oil on demand according to operating conditions. This can easily lead to over-lubrication at low loads, resulting in waste, or insufficient lubrication at high loads, causing wear. Second, the uniformity of lubrication is poor. Traditional oil injection methods are difficult to form a complete oil film on the surface of high-speed shafts, especially for long shaft systems, which are prone to localized poor lubrication. Third, the systems often have low integration and low energy efficiency, and are mostly open designs, making it impossible to recycle lubricating oil, resulting in high consumption and potential environmental pollution. Therefore, this application protects a turbine shaft lubrication device. A pressure drive 11 operates, driving a bevel gear set 12 on its drive end. The bevel gear set 12 drives a pressure threaded tube 7, which in turn drives a pressure threaded rod 8 on its inner side. This causes the pressure threaded rod 8 to stably rise and fall along the inner side of the pressure threaded tube 7. The pressure threaded rod 8 then drives a pressure extrusion plate 9, thereby extruding the gas at the bottom of the pressure extrusion plate 9 into the inner side of an expansion bladder 4. The expansion of the expansion bladder 4... The expansion changes the height of the lubricating fluid inside the lubrication tank 2. Through the siphon principle, the lubricating fluid is guided to the inside of the U-shaped siphon tube 3. The U-shaped siphon tube 3 then guides the lubricating fluid to the inside of the arc-shaped diversion tube 13. The arc-shaped diversion tube 13 then guides the lubricating fluid to the inside of multiple arc-shaped diversion tubes 14. The arc-shaped flip plate 15 is squeezed by hydraulic pressure, causing it to rotate vertically along the flip axis 16. At the same time, the arc-shaped flip plate 15 drives the horn-shaped rubber ring 17 on it, thereby achieving unidirectional diversion by hydraulic pressure. In summary, when the system starts up, the controller coordinates the following: First, the pressure drive motor 11 (servo or stepper motor) drives the pressure threaded tube 7 to rotate via the bevel gear set 12, causing the pressure threaded rod 8 to push the pressure extrusion plate 9 downward, forcing the gas in the pressure tank 5 into the expansion bladder 4 of the lubrication tank 2 through the three-way valve 6. The expansion of the bladder causes the liquid level in the tank to rise. When the liquid level exceeds the apex of the U-shaped siphon tube 3, the lubricating fluid enters the siphon tube under the action of pressure difference and is transported to the arc-shaped diversion pipe 13 installed on the shaft, and then diverted to each arc-shaped drainage pipe 14. The pressure of the lubricating fluid pushes open the arc-shaped flip plate 15 with a reset torsion spring and squeezes the horn-shaped rubber ring 17. A momentary seal is formed, enabling directional and unidirectional spray lubrication to the shaft. The sprayed lubricating oil collects in the oil collection tank at the bottom of the turbine body 1 under gravity, and finally returns to the lubrication tank 2 through the return oil pipeline, forming a complete circulation loop. When lubrication is finished, the controller commands the three-way valve 6 to switch the passage and drive the pressure drive motor 11 to reverse, pulling the extrusion plate upward, the gas in the air bag flows back, the air bag contracts, the pressure in the tank is released through the air pressure balance valve, the liquid level drops, the siphon is interrupted, and at the same time the arc-shaped flip plate 15 is reset and closed under the action of the torsion spring, and the system returns to the standby state. In addition, the liquid replenishment port on the top of the lubrication tank 2 is used to replenish the oil periodically to ensure the long-term stable operation of the system.

[0019] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts therein embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A turbine shaft lubrication device, characterized in that, The turbine body (1) includes a lubricator installed on the turbine body (1), the lubricator including a lubrication box (2), a U-shaped siphon pipe (3) installed on the lubrication box (2), the U-shaped siphon pipe (3) being connected to the turbine body (1), an expansion air bladder (4) installed on the inner side of the lubrication box (2), a pressure box (5) installed on the side wall of the lubrication box (2), the pressure box (5) being connected to the lubrication box (2) and the expansion air bladder (4) via a three-way valve (6), and a pressure threaded pipe installed on the pressure box (5). 7) The pressure threaded tube (7) is inserted into the lubrication box (2) through a bearing. A pressure threaded rod (8) is installed on the inner side of the pressure threaded tube (7). A pressure extrusion plate (9) is installed on the pressure threaded rod (8). A gear set box (10) is installed on the lubrication box (2). The gear set box (10) is mounted on the pressure threaded tube (7) through a bearing. A pressure drive (11) is installed on the gear set box (10). A bevel gear set (12) is installed on the pressure drive (11) and the pressure threaded tube (7).

2. The turbine shaft lubrication device according to claim 1, characterized in that, An arc-shaped diverter pipe (13) is installed on the turbine body (1). The arc-shaped diverter pipe (13) is inserted into the inner side of the turbine body (1). The arc-shaped drain pipe (14) is connected to the U-shaped siphon pipe (3). Multiple arc-shaped drain pipes (14) are installed on the arc-shaped diverter pipe (13). An arc-shaped flip plate (15) is installed on the arc-shaped drain pipe (14). The arc-shaped flip plate (15) is inserted into the inner side of the arc-shaped drain pipe (14) through a flip shaft (16). A horn-shaped rubber ring (17) is installed between the arc-shaped drain pipe (14) and the arc-shaped flip plate (15).

3. A turbine shaft lubrication device according to claim 2, characterized in that, The pressure drive (11) is a servo motor or a stepper motor; the three valves (6) are electromagnetic control valves and are electrically connected to a controller.

4. A turbine shaft lubrication device according to claim 3, characterized in that, The top of the lubrication box (2) is provided with a liquid replenishment port and a pressure balance valve.

5. A turbine shaft lubrication device according to claim 4, characterized in that, The horn-shaped rubber ring (17) is made of oil-resistant rubber material.

6. A turbine shaft lubrication device according to claim 5, characterized in that, An oil collection trough is provided at the bottom of the turbine body (1) corresponding to the outlet position of the arc-shaped diversion pipe (14).

7. A turbine shaft lubrication device according to claim 1, characterized in that, The differential pressure control valve is an electrically operated regulating valve and is connected to the central controller for dynamically adjusting its opening degree according to the pressure changes in the combustion chamber.

8. A turbine shaft lubrication device according to claim 1, characterized in that, The lifting and tensioning rope is made of high-temperature resistant steel wire rope, and the floating ball is made of high-temperature resistant buoyancy material.

9. A turbine shaft lubrication device according to claim 1, characterized in that, The three valves are three-way solenoid valves used to control the gas flow direction between the gas control box and the combustion chamber.

10. A turbine shaft lubrication device according to claim 1, characterized in that, The central controller is also connected to a data storage module.

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