Oil leakage monitoring and oil leakage buffering device for bulb tubular generator set oil receiver

Abstract

The utility model relates to a lamp bulb tubular flow type generator set oil receiver oil leakage monitoring and oil leakage buffer device, contain oil inlet pipe, buffer oil tank cover plate, oil tank breather, buffer oil tank main part, buffer oil tank main part is cuboid structure, buffer oil tank main part is installed in the side of wheel hub oil tank, buffer oil tank cover plate is installed in the top of buffer oil tank main part and is connected with buffer oil tank main part bolt, oil tank breather is installed in the top of buffer oil tank cover plate median position through bolt, oil inlet pipe is U type pipe, and the oil inlet pipe middle part of oil inlet pipe is bolted and is installed on the side wall in the left top of buffer oil tank main part, one end pipeline of the both ends pipeline of oil inlet pipe is communicated with wheel hub oil tank, and the other end pipeline is communicated with the top of buffer oil tank main part. The utility model greatly reduces the reform difficulty and cost caused by space limitation while solving the problem of oil overflow, improves the economic benefit of power station, improves the safety and stability of unit operation.

Description

Technical Field

[0001] This utility model relates to the field of generator technology, specifically to a device for monitoring and buffering oil leakage in the oil receiver of a bulb-type generator set. Background Technology

[0002] The oil receiver of the axial-flow turbine generator set is installed inside the generator compartment. Its main functions are to supply operating oil to the blades of the bulb turbine and to supply lubricating oil to the hub of the bulb turbine. The operating oil for the blades comes from the power station's speed control system, while the lubricating oil for the hub comes from the hub oil tank.

[0003] The pressure oil system has three oil tanks: a leakage tank located on the 13.7m floor of the plant, a speed control system return oil tank located on the 34.0m floor of the plant, and a hub oil tank located on the 44.7m floor of the plant.

[0004] The main working principle is as follows: The oil leakage tank is located on the lowest floor of the plant and mainly collects oil leakage from the oil receiver, return oil from the segmented shut-off device, return oil from the counterweight shut-off valve, return oil from the locking solenoid valve, and return oil from the overspeed protection device. When the oil level in the leakage tank reaches a certain height, the oil is pumped to the wheel hub oil tank by the leakage pump. The wheel hub oil tank mainly acts as a transfer tank, supplying oil to the runner hub via gravity flow, passing through the oil receiver, and supplying oil to the governor's return oil tank via gravity flow. This achieves the circulation of the pressure oil system.

[0005] The oil receiver connects the opening and closing pressure oil from the governor's main pressure distribution valve to the piston cylinder inside the runner via operating oil pipes (four oil pipes assembled), forming an oil supply system for operating the runner blades. The inner cavity of the oil receiver supplies oil from the hub oil tank to the runner hub, creating a constant pressure oil level. This pressure oil is used to seal the blades and the runner body, preventing water from entering the runner body from the flow channel.

[0006] Oil leakage from the receiver is caused by long-term wear of the receiver's floating bearing. After the floating bearing wears down, the operating oil of the runner blades leaks into the hub lubricating oil and flows back to the hub oil tank along the hub oil supply pipeline. The amount of oil leaking inside cannot be detected during routine inspections. However, once the oil leakage exceeds the critical point, a large amount of oil will overflow from the hub oil tank, causing economic losses due to unplanned unit shutdowns and oil pollution in the plant.

[0007] The shortcomings of existing technology are:

[0008] Since the oil receiver leak is caused by the long-term wear of the floating bearing, the amount of oil leakage inside cannot be detected during routine inspections. Once the leakage exceeds the critical point, a large amount of oil will overflow from the hub tank, resulting in unplanned shutdown of the unit, economic losses, and oil pollution in the plant. Summary of the Invention

[0009] This utility model addresses the aforementioned problems by providing a bulb-type generator set oil receiver oil leakage monitoring and leakage buffering device. Its purpose is to solve the oil spill problem while greatly reducing the difficulty and cost of modification due to space constraints; improving the economic efficiency of the power station; and enhancing the safety and stability of the unit operation.

[0010] To solve the above problems, the technical solution provided by this utility model is as follows:

[0011] A bulb-type generator set oil receiver leakage monitoring and leakage buffering device includes an oil inlet pipe, a buffer tank cover, a tank breather, and a buffer tank body. The buffer tank body is a cuboid structure, installed on the side of the hub tank and used to store overflow from the hub tank. The buffer tank cover is a rectangular flat plate, installed on the top of the buffer tank body and bolted to it. The tank breather is bolted to the top center of the buffer tank cover and is used to draw air into the top of the buffer tank body. The oil inlet pipe is a U-shaped pipe, with its middle section bolted to the upper left side wall of the buffer tank body. Both ends of the oil inlet pipe are welded to the middle section, with one end connected to the hub tank and the other end connected to the top of the buffer tank body.

[0012] Preferably, the bottom wall of the buffer oil tank body is provided with an oil drain pipe; the oil drain pipe is a 7-shaped pipe, one end of the oil drain pipe is fixed to the bottom wall of the buffer oil tank body by bolts and is flush with the bottom wall of the buffer oil tank body, and the other end is connected to the oil supply pipeline from the wheel hub oil tank to the governor return tank.

[0013] Preferably, a magnetic level transmitter is bolted to the right side of the buffer tank body; the magnetic level transmitter is a cylindrical structure, and its two ends are connected to the top and bottom side walls of the buffer tank body via valves and flanges, respectively; the left side of the flange is welded to the right side wall of the buffer tank body, and the right side is welded to the valve; the right side of the valve is bolted to the magnetic level transmitter.

[0014] Preferably, the left side of the oil inlet pipe is 1mm to 20mm higher than the right side; the diameter of the oil inlet pipe is 40mm to 60mm.

[0015] Preferably, the material thickness of the buffer tank cover is 6mm to 10mm; the material thickness of the buffer tank body is 8mm to 10mm.

[0016] Preferably, the nominal diameter of the fuel tank breather ranges from 40mm to 100mm.

[0017] Preferably, the nominal diameter of the valve is in the range of 20 to 40 mm.

[0018] Preferably, the diameter of the oil drain pipe is in the range of 40mm to 60mm.

[0019] Compared with the prior art, this utility model has the following advantages:

[0020] 1. Because the structure of this utility model is simple and clear, and the layout is compact and reasonable, the installation space requirement is minimal. The factory space of the bulb-type flow generator can easily meet its layout requirements, thereby solving the oil spill problem while greatly reducing the difficulty and cost of modification caused by space limitations.

[0021] 2. Because the device of this utility model has low manufacturing and installation costs, its implementation directly reduces the number of unplanned shutdowns for maintenance, directly improves the power generation efficiency of the power station, and thus enhances the economic benefits of the power station.

[0022] 3. Because this utility model uses a level transmitter to dynamically monitor the oil level in the buffer tank, it enables power plant operation and maintenance personnel to grasp the fault dynamics of the oil receiver in real time and accurately, thereby improving the safety and stability of unit operation. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the oil leakage monitoring and oil leakage buffer device for the bulb-type generator set oil receiver, which is a specific embodiment of this utility model.

[0024] The components include: 1. Oil inlet pipe, 2. Buffer tank cover plate, 3. Oil tank breather, 4. Buffer tank body, 5. Magnetic level transmitter, 6. Valve, 7. Flange, 8. Oil drain pipe, and 1.1. Middle section of oil inlet pipe. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0026] This utility model application claims protection for a bulb-type transom generator set oil receiver oil leakage monitoring and leakage buffering device, such as Figure 1As shown, the system includes an inlet pipe 1, a buffer tank cover plate 2, a tank breather 3, and a buffer tank body 4. The buffer tank body 4 is a cuboid structure; it is installed on the side of the wheel hub tank and used to store overflow from the wheel hub tank. The buffer tank cover plate 2 is a rectangular flat plate structure, installed on the top of the buffer tank body 4 and bolted to it. The tank breather 3 is bolted to the top center of the buffer tank cover plate 2 and is used to draw air into the top of the buffer tank body 4. The inlet pipe 1 is a U-shaped pipe, with its middle section 1.1 bolted to the upper left side wall of the buffer tank body 4. Both ends of the inlet pipe 1 are welded to the middle section 1.1, with one end connected to the wheel hub tank and the other end connected to the top of the buffer tank body 4.

[0027] It should be noted that the main cause of the oil overflow in the hub tank is the oil leak inside the receiver. However, the receiver shaft and floating bearing are inspected every year during the power station's annual maintenance. There is no obvious wear on the outside, and the fit between the two has not changed significantly. Since the unit was put into operation, the annual inspection has shown that the wear is about 0.07mm. Therefore, it can be seen that the oil leak in the receiver is somewhat unpredictable, and it is not feasible to fundamentally solve the oil leak problem.

[0028] The fundamental reason for the overflow of the hub oil tank is that after the oil receiver leaks, the operating oil of the runner blades leaks into the hub lubricating oil. Due to the pressure difference, the oil supply pipe from the hub oil tank to the hub becomes a reverse oil supply to the hub oil tank. The reverse oil supply continuously supplies oil to the governor return oil tank through another path of the hub oil tank, thus realizing the oil circuit circulation. When the reverse oil supply reaches a certain flow rate, the oil leakage pump of the leaking tank starts, which will break the circulation balance, causing the hub oil tank to overflow a large amount of oil through the breather, cover plate and other parts.

[0029] It needs further explanation that, since the fundamental problem of oil leakage from the receiver could not be resolved, the focus shifted to studying oil inlet in the wheel hub tank. This issue primarily affects oil spills and unplanned downtime; resolving the oil spill problem would prevent unplanned downtime. Our analysis suggests that overflow can be diverted using a buffer tank. Calculations show the overflow tank volume is 0.6 m³. Therefore, by adding a buffer tank with a volume greater than 0.6 m³ at the wheel hub tank location, and connecting it via pipeline, the overflow can be diverted to the buffer tank for temporary storage. To ensure smooth overflow, an oil breather device can be installed on top of the tank.

[0030] It should be noted that the bottom wall of the buffer oil tank body 4 is provided with an oil drain pipe 8; the oil drain pipe 8 is a 7-shaped pipe, one end of the oil drain pipe 8 is fixed to the bottom wall of the buffer oil tank body 4 by bolts and is flush with the bottom wall of the buffer oil tank body 4, and the other end is connected to the oil supply pipeline from the wheel hub oil tank to the governor return tank.

[0031] It needs further explanation that while the oil spill problem has been solved, how to handle the spill remains an issue. Based on several fault analyses, the oil spill always occurred when the oil pump was started. With the addition of a buffer tank, we can install an oil drain pipe 8 at the bottom of the buffer tank, which is connected to the oil supply pipe from the hub tank to the governor return tank. If an oil spill occurs, the spilled oil will first be drained into the buffer tank. After the oil pump stops, the spilled oil stored in the buffer tank will then be drained by gravity into the governor return tank. This not only solves the oil spill handling problem but also ensures the oil circulation of the pressure oil device.

[0032] It should be noted that a magnetic level transmitter 5 for displaying and outputting the liquid level signal of the buffer tank is fixedly installed on the right side of the buffer tank body 4 by bolts. The magnetic level transmitter 5 has a cylindrical structure. The two ends of the magnetic level transmitter 5 are connected to the top and bottom side walls of the buffer tank body 4 by valves 6 and flanges 7, respectively. The valves 6 and flanges 7 located at the bottom are flush with the bottom of the buffer tank body 4. The left side of the flange 7 is fixedly connected to the right side wall of the buffer tank body 4 by welding, and the right side is fixedly connected to the valve 6 by welding. The right side of the valve 6 is bolted to the magnetic level transmitter 5 and is used for the inspection and maintenance of the magnetic level transmitter 5.

[0033] It should be further explained that, considering the possibility of an oil spill, the above solution can resolve the issue, but the entire process is short and lacks any monitoring signals. If the system operates in this state continuously, power plant maintenance personnel will find it difficult to detect problems in a timely manner and will not be able to understand the operating status of the oil receiver. Therefore, we have installed a magnetic level transmitter 5 on the side of the newly added oil tank. The flange 7 of the magnetic level transmitter 5 is connected to the top and bottom of the oil tank, and the level signal is connected to the unit monitoring system. This ensures that once the buffer tank is filled with oil, the monitoring system will promptly send a signal to the maintenance personnel to alert them to the operating status of the oil receiver.

[0034] In this specific embodiment, the left side of the oil inlet pipe 1 is 1mm to 20mm higher than the right side of the oil inlet pipe 1; the diameter of the oil inlet pipe 1 is 40mm to 60mm.

[0035] In this specific embodiment, the material thickness of the buffer tank cover plate 2 is 6mm to 10mm; the material thickness of the buffer tank body 4 is 8mm to 10mm.

[0036] In this specific embodiment, the nominal diameter of the fuel tank breather 3 ranges from 40mm to 100mm.

[0037] In this specific embodiment, the nominal diameter of valve 6 ranges from 20 to 40 mm.

[0038] In this specific embodiment, the diameter of the oil drain pipe 8 ranges from 40mm to 60mm.

[0039] It should be noted that the innovative technology employed in this invention successfully overcomes the long-standing industry problem of oil spillage from the hub tank of bulb turbine generator sets, effectively preventing environmental pollution caused by oil spills and avoiding unplanned downtime due to spills, thus greatly improving the stability and reliability of the unit's operation. Furthermore, this technology enables power plant maintenance personnel to grasp the dynamic status of the oil receiver's faults in real time and with precision, providing highly authoritative and guiding evidence for the safe operation, scientific maintenance, and efficient upkeep of the unit, effectively guaranteeing the safe production and economic benefits of the power plant.

[0040] It should be further explained that, from a structural design perspective, the oil receiver oil leakage monitoring and oil leakage buffer device of the bulb-type generator set has a simple and clear structure, a compact and reasonable layout, and requires very little installation space. The factory space of the bulb-type generator set can easily meet its layout requirements, which greatly reduces the difficulty and cost of modification caused by space limitations.

[0041] It should be further explained that, from a cost control perspective, based on our station's previous renovation experience, the cost of each unit of this device is strictly controlled within 10,000 yuan. With minimal investment, it directly reduces the number of unplanned downtime maintenance, directly improves the power station's power generation efficiency, and has outstanding overall economic efficiency. It is truly cost-effective and is an ideal choice for the optimization and upgrading of bulb turbine units.

[0042] It should be further explained that, in terms of technology promotion and application, oil overflow from the hub tank is a common technical pain point in bulb turbine generator sets, seriously affecting the reliable operation of the unit and the economic benefits of the power plant. This invention provides a systematic solution with broad applicability and promotional value. During the design and manufacturing stage of the hub tank, the ideas and principles of this invention can be used to optimize and improve the tank structure, such as by rationally setting oil level monitoring points and optimizing the internal structure of the tank, to achieve a similar effect. Furthermore, this technology can be compatible with existing power plant equipment, providing a practical technical path for upgrading and retrofitting older units, and contributing to the technological progress and development of the entire bulb turbine generator set industry.

[0043] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the present invention is in a state with fewer features than all of the disclosed individual embodiments. Therefore, the appended claims are hereby clearly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the present invention.

[0044] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.

[0045] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."

[0046] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A device for monitoring and buffering oil leakage in the oil receiver of a bulb-type generator set, characterized in that: The system includes an oil inlet pipe (1), a buffer tank cover plate (2), a tank breather (3), and a buffer tank body (4), wherein: the buffer tank body (4) is a cuboid structure; the buffer tank body (4) is installed on the side of the wheel hub tank and is used to store the overflow oil from the wheel hub tank; the buffer tank cover plate (2) is a rectangular flat plate structure, the buffer tank cover plate (2) is installed on the top of the buffer tank body (4) and bolted to the buffer tank body (4); the tank breather (3) is bolted to the buffer tank body. At the top center of the fuel tank cover (2), the fuel tank breather (3) is used to draw air into the top of the buffer fuel tank body (4); the fuel inlet pipe (1) is a U-shaped pipe, and the middle part (1.1) of the fuel inlet pipe (1) is bolted to the upper left side wall of the buffer fuel tank body (4); the two ends of the fuel inlet pipe (1) are fixedly connected to the middle part (1.1) of the fuel inlet pipe by welding, one end of the pipe is connected to the hub fuel tank, and the other end of the pipe is connected to the top of the buffer fuel tank body (4).

2. The oil leakage monitoring and buffering device for the oil receiver of a bulb-type generator set according to claim 1, characterized in that: The bottom wall of the buffer oil tank body (4) is provided with an oil drain pipe (8); the oil drain pipe (8) is a 7-shaped pipe, one end of the oil drain pipe (8) is fixed to the bottom wall of the buffer oil tank body (4) by bolts and is flush with the bottom wall of the buffer oil tank body (4), and the other end is connected to the oil supply pipeline from the hub oil tank to the governor return tank.

3. The oil leakage monitoring and buffering device for the oil receiver of a bulb-type generator set according to claim 2, characterized in that: A magnetic level transmitter (5) is fixedly installed on the right side of the buffer tank body (4) by bolts. The magnetic level transmitter (5) is a cylindrical structure. The two ends of the magnetic level transmitter (5) are connected to the top and bottom side walls of the buffer tank body (4) by valves (6) and flanges (7), respectively. The left side of the flange (7) is fixedly connected to the right side wall of the buffer tank body (4) by welding, and the right side is fixedly connected to the valve (6) by welding. The right side of the valve (6) is bolted to the magnetic level transmitter (5).

4. The oil leakage monitoring and buffering device for the oil receiver of the bulb-type generator set according to claim 3, characterized in that: The left side of the oil inlet pipe (1) is 1mm to 20mm higher than the right side; the diameter of the oil inlet pipe (1) is 40mm to 60mm.

5. The oil leakage monitoring and buffering device for the oil receiver of a bulb-type generator set according to claim 4, characterized in that: The material thickness of the buffer tank cover plate (2) is 6mm to 10mm; the material thickness of the buffer tank body (4) is 8mm to 10mm.

6. The oil leakage monitoring and buffering device for the oil receiver of a bulb-type generator set according to claim 5, characterized in that: The nominal diameter of the fuel tank breather (3) ranges from 40 mm to 100 mm.

7. The oil leakage monitoring and buffering device for the oil receiver of a bulb-type generator set according to claim 6, characterized in that: The nominal diameter of the valve (6) is in the range of 20 to 40 mm.

8. The oil leakage monitoring and buffering device for the oil receiver of a bulb-type generator set according to claim 7, characterized in that: The diameter of the drain pipe (8) is in the range of 40mm to 60mm.

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