Uniflow ring type sealing oil system of generator
By setting up two parallel and independently working float tanks in the generator's single-flow ring-type sealing oil system, equipped with bypass pipes and pressure balance doors, the oil level instability caused by the easy sticking of the float valve in the sealing oil float tank is solved. problems, achieving higher equipment reliability and economic benefits.
Patent Information
- Application Number
- CN202420076910.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-11
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-01-11
AI Technical Summary
In the existing generator single-flow ring sealing oil system, the float valve of the sealing oil float tank is prone to jamming, resulting in unstable oil level, poor oil inlet or hydrogen flow out, increasing the risk of hydrogen leakage and oil inlet accidents.
A single-flow ring-type sealed oil system for generators including two parallel and independently working float tanks is designed. Each float tank is equipped with a bypass pipeline and a pressure balance door to ensure that when one float tank fails, the other float tank Can work normally and independently isolate and control the liquid level through the bypass system.
It effectively avoids the problem of oil inflow and hydrogen leakage in the generator, improves the reliability of the equipment, reduces hydrogen leakage accidents and hydrogen replenishment consumption, and increases economic benefits.
Smart Images
Figure CN222377226U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of generator shaft sealing, in particular to a generator single-flow ring type sealing oil system. Background Art
[0002] Hydrogen-cooled generators are cooled by hydrogen. To prevent hydrogen from leaking out along the rotor axis during operation and causing fire or explosion, the unit is equipped with a sealing oil system, which circulates sealing oil with a pressure higher than the hydrogen pressure to the sealing pads at the junction of the shaft and the end cover. Figure 1 As shown in the figure, the sealing oil system adopts a single-flow ring sealing shoe, and there is only one sealing oil circuit, which enters the sealing shoe on the turbine side and the exciter side respectively, flows to the air side and the hydrogen side along the axial gap through the middle oil hole, and the oil film formed plays a role in sealing and lubrication. Then the oil is divided into two circuits (hydrogen side and air side). The oil flows to the hydrogen side and is discharged to the expansion tank, then enters the sealing oil float tank, and finally returns to the sealing oil tank; the oil flows to the air side and the bearing return oil is discharged to the air precipitation tank.
[0003] The existing sealed oil float tank is only one, the role of the float tank is to further separate the hydrogen in the oil, and to control the oil level of the expansion tank to be normal through the automatic adjustment of the float valve. The float tank is equipped with a float valve that automatically controls the oil level to keep the oil level in the tank within a certain range.
[0004] However, the existing single-flow ring sealing oil system has the following shortcomings:
[0005] (1) The float valve in the sealing oil float tank is prone to getting stuck, causing the oil level in the tank to be too high or too low. If the oil level is too high, the generator sealing oil will not return smoothly and the generator will not be able to enter the oil tank. If the oil level is too low, a large amount of hydrogen will flow out of the generator, posing the risk of hydrogen explosion.
[0006] (2) When inspecting the float valve of the sealing oil float tank, it is necessary to isolate the float tank and switch to bypass operation. The bypass system has no bypass pipe and no balancing door, which will cause a large amount of hydrogen to flow out of the generator.
[0007] (3) The bypass system of the sealing oil float tank has a small volume and no float valve, so the liquid level cannot be effectively controlled. The large fluctuation of the liquid level and the poor oil return will cause the generator to enter the oil. At the same time, the separated gas cannot be recovered, and the hydrogen leakage will reach 200m3 / day, which is easy to cause the generator to enter the oil and hydrogen leakage accidents. In view of this, a single-flow ring sealing oil system for the generator is proposed. Summary of the invention
[0008] The technical solution adopted by the utility model to solve the background technical problem is:
[0009] A generator single-flow ring sealing oil system is provided, comprising a sealing oil tank, a sealing oil pump and an oil inlet pipeline. A sealing shoe is arranged on the outer side of the generator rotor shaft, the oil inlet pipeline is connected with the sealing shoe, and oil is supplied to the sealing shoe for sealing through the sealing oil pump. A hydrogen side return oil pipeline is arranged on one side of the sealing shoe, and the end of the hydrogen side return oil pipeline is connected to a sealing oil expansion tank. The rear end of the sealing oil expansion tank is connected with a first float oil tank and a second float oil tank arranged in parallel. The first float oil tank is provided with a first float oil tank bypass pipeline, the second float oil tank is provided with a second float oil tank bypass pipeline, a first float oil tank bypass pressure balancing gate is provided on the first float oil tank bypass pipeline, and a second float oil tank bypass pressure balancing gate is provided on the second float oil tank bypass pipeline; the rear ends of the first float oil tank, the second float oil tank, the first float oil tank bypass pipeline and the second float oil tank bypass pipeline are connected with the sealing oil tank through the oil return pipeline.
[0010] Preferably, the first float tank is provided with a first float tank pressure balancing door, the second float tank is provided with a second float tank pressure balancing door, and the first float tank pressure balancing door and the second float tank pressure balancing door are connected by a pipeline.
[0011] Preferably, the first float oil tank pressure balancing door and the second float oil tank pressure balancing door are both automatic doors.
[0012] Preferably, the first float oil tank pressure balance door and the second float oil tank pressure balance door are connected to the sealing oil expansion tank through an expansion tank pressure balance main door.
[0013] Preferably, a pressure balancing pipeline is provided between the first float oil tank bypass pipeline and the second float oil tank bypass pipeline, connected to the sealing oil expansion tank, and an automatic exhaust valve is provided on the pressure balancing pipeline.
[0014] Preferably, the first float oil tank and the second float oil tank have the same specifications and models.
[0015] The beneficial effect of the utility model is that the utility model sets two parallel and independently working float oil tanks in the sealing oil system. When one float oil tank has a problem, the other float oil tank can work normally, and bypass pipes are respectively set corresponding to the two float oil tanks, and oil inlet gates are added, which can be convenient for isolation and commissioning. When the float oil tank fails or is repaired, the bypass pipe can also work independently through the balance gate. Avoid the problems of oil inlet and hydrogen leakage of the generator, prevent the damage of the generator oil inlet, avoid the occurrence of explosion accidents caused by hydrogen leakage of the generator, prevent the consumption of a large amount of hydrogen supplement caused by hydrogen leakage of the generator, improve the reliability of the equipment, and increase the economic benefits for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0017] Figure 1 It is a schematic diagram of the existing single-flow ring type sealing oil system and the motor shaft installation structure provided by the embodiment of the utility model;
[0018] Figure 2 It is a schematic diagram of the improved structure of the single-flow ring type sealing oil system provided in the embodiment of the utility model;
[0019] In the figure: 1-sealed oil tank, 2-sealed oil pump, 3-oil inlet pipeline, 4-generator, 5-sealed tile, 6-hydrogen side return oil pipeline, 7-sealed oil expansion tank, 8-first float oil tank, 9-second float oil tank, 10-first float oil tank bypass pipeline, 11-second float oil tank bypass pipeline, 12-first float oil tank bypass pressure balance door, 13-second float oil tank bypass pressure balance door, 14-first float oil tank pressure balance door, 15-second float oil tank pressure balance door, 16-expansion tank pressure balance main door, 17-return oil pipeline. DETAILED DESCRIPTION
[0020] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the utility model rather than to limit the scope of the utility model. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are usually the conditions in conventional experiments.
[0021] In a specific embodiment, a generator single-flow ring type sealing oil system is provided, and the same parts as the prior art are that it includes a sealing oil tank 1 for storing sealing oil, a sealing oil pump 2 for supplying sealing oil, and an oil inlet pipeline 3. A sealing shoe 5 is arranged on the outer side of the rotor shaft of the generator 4, and the oil inlet pipeline 3 is connected with the sealing shoe 5, and the sealing oil pump 2 is used to supply oil to the sealing shoe 5 for sealing, and the sealing oil flows along the gap between the sealing shoe 5 and the rotor shaft along the axial air side and the hydrogen side through the middle oil hole, so that the sealing shoe 5 and the rotor shaft of the generator 4 can form an oil film to play a sealing and lubricating role.
[0022] In this example, in order to recycle the sealing oil, the air side return oil is discharged into the air separation tank, and the sealing oil on the hydrogen side is discharged into the sealing oil expansion tank 7, and then enters the float oil tank for further separation of oil and gas, and finally returns to the sealing oil tank 1. Therefore, in this example, a hydrogen side return oil pipeline 6 is provided on one side of the sealing shoe 5, and its end is connected to the sealing oil expansion tank 7.
[0023] In this example, in order to ensure that the sealing oil float tank can maintain stable operation in the system, two sets of float tanks and supporting systems are set up in this example. The two float tanks can be parallel and operate independently. The two float tanks have the same model and specifications, and a bypass system is also provided for each float tank. The details are as follows:
[0024] The first float oil tank 8 and the second float oil tank 9 are connected to the rear end of the sealing oil expansion tank 7. The first float oil tank 8 is provided with a first float oil tank bypass pipeline 10, and the second float oil tank 9 is provided with a second float oil tank bypass pipeline 11. The first float oil tank bypass pipeline 10 is provided with a first float oil tank bypass pressure balance gate 12, and the second float oil tank bypass pipeline 11 is provided with a second float oil tank bypass pressure balance gate 13. The function of the balance gate is to ensure the stability of the oil tank liquid level and recover the separated gas at the same time. After the bypass pipeline is added with a balance gate, the hydrogen leakage can be reduced to 30m3 / day. The rear end of the first float oil tank 8, the rear end of the second float oil tank 9, the rear end of the first float oil tank bypass pipeline 10, and the rear end of the second float oil tank bypass pipeline 11 are connected to the sealing oil tank 1 through the return oil pipeline 17.
[0025] During use, if one float tank fails, the other float tank can work normally to ensure that the hydrogen leakage is less than 12m3 / day, avoiding the unit from stopping unexpectedly; when the other float tank also fails, manually switch to a float tank bypass pipeline operation, and the hydrogen leakage can be controlled to 30m3 / day. Since the hydrogen replenishment capacity is 60m3 / h, the normal operation of the unit can also be maintained. When the bypass pipeline of this float tank also fails and exits operation, it can also switch to another float tank bypass pipeline operation. In this way, the system has three sets of backup modes, among which one set of backup can operate normally, and two sets of backup can maintain operation, avoiding the occurrence of unexpected shutdown of the unit. Therefore, in summary, the problems of generator oil inlet and hydrogen leakage are avoided, the generator oil inlet is damaged, the explosion accident caused by generator hydrogen leakage is avoided, and the consumption of a large amount of hydrogen replenishment caused by generator hydrogen leakage is prevented, the reliability of the equipment is improved, and the economic benefits for the enterprise are increased.
[0026] In order to prevent the oil in one float tank from blocking the pressure balance pipe and affecting the normal operation of the other float tank after a float tank is full of oil due to a fault, the first float tank 8 is provided with a first float tank pressure balance door 14, and the second float tank is provided with a second float tank pressure balance door 15, and the first float tank pressure balance door 14 and the second float tank pressure balance door 15 are connected by pipelines. Here, the first float tank pressure balance door 14 and the second float tank pressure balance door 15 are both automatic doors, which can automatically exhaust gas, and the gas can pass normally but the sealing oil cannot pass.
[0027] Furthermore, the first float oil tank pressure balance door 14 and the second float oil tank pressure balance door 15 are connected to the sealing oil expansion tank 7 through the expansion tank pressure balance main door 16. The pressure of the float oil tank and the sealing oil expansion tank 7 is kept balanced, and the hydrogen separated from the oil in the float oil tank is returned to the expansion tank to prevent the pressure in the float oil tank from being blocked and causing the oil return from the expansion tank to be blocked.
[0028] In order to increase the volume of the bypass pipe system and improve the working reliability of the bypass pipe system, a pressure balancing pipe is arranged between the first float oil tank bypass pipe 10 and the second float oil tank bypass pipe 11, connected to the sealing oil expansion tank 7, and an automatic exhaust valve is arranged on the pressure balancing pipe.
[0029] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the invention through the above description. The technical scope of the invention is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A generator single-flow ring sealing oil system, comprising a sealing oil tank (1), a sealing oil pump (2) and an oil inlet pipeline (3), wherein a sealing shoe (5) is arranged outside the rotor shaft of the generator 4, the oil inlet pipeline (3) is connected to the sealing shoe (5), and the sealing oil pump (2) supplies oil to the sealing shoe (5) for sealing, a hydrogen side oil return pipeline (6) is arranged on one side of the sealing shoe (5), and the end thereof is connected to a sealing oil expansion tank (7), characterized in that: The rear end of the sealing oil expansion tank (7) is connected to a first float oil tank (8) and a second float oil tank (9) which are arranged in parallel; the first float oil tank (8) is provided with a first float oil tank bypass pipeline (10); the second float oil tank (9) is provided with a second float oil tank bypass pipeline (11); a first float oil tank bypass pressure balance valve (12) is provided on the first float oil tank bypass pipeline (10); and a second float oil tank bypass pressure balance valve (13) is provided on the second float oil tank bypass pipeline (11); the rear ends of the first float oil tank (8), the second float oil tank (9), the first float oil tank bypass pipeline (10) and the second float oil tank bypass pipeline (11) are connected to the sealing oil tank through an oil return pipeline (17).
2. A generator single-flow ring sealing oil system as claimed in claim 1, characterized in that: The first float oil tank (8) is provided with a first float oil tank pressure balance door (14), the second float oil tank is provided with a second float oil tank pressure balance door (15), and the first float oil tank pressure balance door (14) and the second float oil tank pressure balance door (15) are connected by a pipeline.
3. A generator single-flow ring sealing oil system as claimed in claim 2, characterized in that: The first float oil tank pressure balancing door (14) and the second float oil tank pressure balancing door (15) are both automatic doors.
4. A generator single-flow ring sealing oil system as claimed in claim 3, characterized in that: The first float oil tank pressure balance door (14) and the second float oil tank pressure balance door (15) are connected to the sealing oil expansion tank (7) through an expansion tank pressure balance main door (16).
5. A generator single-flow ring sealing oil system as claimed in claim 1, characterized in that: A pressure balancing pipeline is provided between the first float oil tank bypass pipeline (10) and the second float oil tank bypass pipeline (11), connected to the sealing oil expansion tank (7), and an automatic exhaust valve is provided on the pressure balancing pipeline.
6. A generator single-flow ring sealing oil system as claimed in claim 1, characterized in that: The first float oil tank (8) and the second float oil tank (9) have the same specifications and models.