Uniflow ring sealing oil system without oil return expansion groove

Abstract

The utility model relates to a uniflow ring sealing oil system without an oil return expansion groove, which belongs to the field of large generator hydrogen sealing and comprises a sealing oil storage tank, a hydrogen side oil return tank and a vacuum oil tank, an inlet of the hydrogen side oil return tank is connected with a steam turbine end defoaming chamber and an exciter end defoaming chamber of a generator, and an outlet of the hydrogen side oil return tank is connected with an inlet of the vacuum oil tank. An inlet of the sealing oil storage tank is connected with a bearing box oil discharge outlet of the generator, an outlet of the sealing oil storage tank is connected with an inlet of the vacuum oil tank, and an outlet of the vacuum oil tank is connected with a sealing ring cavity of the generator. And the gas side space of the steam turbine end defoaming chamber and / or the exciter end defoaming chamber is connected with the top of the inner cavity of the hydrogen side oil return tank through a pressure balance pipe. The device has the advantages that the problem of'gas blockage 'of the oil return pipe caused by gas expansion of the hydrogen-side oil tank and backflow into the generator along the oil return pipe when gas in the generator is depressurized is solved, and a large amount of oil is prevented from entering the generator due to high liquid level of a defoaming chamber of the generator.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of large -scale generator hydrogen seal, in particular to a single -flow ring sealing oil system of no oil return expansion groove. BACKGROUND

[0002] In the operation process of hydrogen-cooled generator, to ensure that the hydrogen in the generator does not leak outward along the rotor, causes fire or explosion and other serious safety accidents, and at the same time maintains the hydrogen purity and pressure in the generator, the sealing oil system plays a vital role.The traditional single-flow ring type sealing oil system is mainly composed of sealing tile, generator defoaming chamber, hydrogen side sealing oil tank, vacuum oil tank, air side sealing oil tank, sealing oil pump, differential pressure regulating valve and corresponding pipeline, valve and instrument etc.Its working principle is to supply sealing oil with pressure higher than hydrogen pressure to the sealing tile at the junction of the shaft and the end cover, forming an oil film to seal the hydrogen in the generator and prevent it from leaking out.The sealing oil circuit has only one way, which enters the sealing tile of the steam turbine side and the exciter side respectively, flows to the air side and the hydrogen side along the axial gap through the intermediate oil hole, and then returns to the oil tank in two ways (hydrogen side and air side).The hydrogen side return oil is discharged to the hydrogen side oil tank through the defoaming chamber;The air side return oil is discharged to the air side sealing oil tank with the bearing return oil, and the hydrogen side sealing oil tank and the air side sealing oil tank supply oil to the vacuum oil tank to meet the system circulation.

[0003] However, the existing generator single-flow ring sealing oil system has the following technical problems: since the hydrogen side sealing oil tank is not provided with an exhaust pipeline, the upper part of the hydrogen side oil tank is the same as the generator during normal operation, and there is high-pressure hydrogen gas, when the generator is depressurized for gas replacement or emergency hydrogen discharge, the hydrogen gas in the hydrogen side return oil tank expands, and flows upward along the hydrogen side return oil pipe to the generator sealing oil defoaming chamber, forming a "gas plug" in the sealing oil return pipeline, which hinders the return of oil, causes poor return of oil in the defoaming chamber, and causes the oil level to rise, causing the generator to enter oil, and at the same time the oil level in the steam turbine lubricating oil tank drops rapidly, threatening the safety of the steam turbine generator unit.

[0004] In view of the above problems, it is necessary to improve and optimize the existing single-flow ring type sealing oil system to improve its stability and safety during operation, reduce the risk of failure, and ensure the normal operation of the hydrogen-cooled generator. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a single-flow ring sealing oil system without oil return expansion groove, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] The utility model provides a single -flow ring sealing oil system of no oil return expansion groove, including sealing oil storage tank, hydrogen side oil return tank and vacuum oil tank, the import of hydrogen side oil return tank is connected through the pipeline turbine end defoaming chamber and exciter end defoaming chamber of generator, the export of hydrogen side oil return tank is connected through the pipeline import of vacuum oil tank, the import of sealing oil storage tank is connected through the pipeline oil discharge port of bearing box of generator, the export of sealing oil storage tank is connected through the pipeline import of vacuum oil tank, the export of vacuum oil tank is connected through the pipeline in proper order cooler, filter and sealing ring cavity of generator in sequence, the gas side space of turbine end defoaming chamber and exciter end defoaming chamber is communicated, and the gas side space of turbine end defoaming chamber and / or exciter end defoaming chamber is connected through pressure balance pipe the inner chamber top of hydrogen side oil return tank.

[0008] On the basis of the above technical scheme, the utility model still can make following improvement.

[0009] Further, the pressure balance pipe is provided with a control valve.

[0010] Further, the control valve is an electromagnetic valve and is connected to a controller.

[0011] Further, the turbine end defoaming chamber and the exciter end defoaming chamber are respectively connected with branch pipelines, the branch pipelines converge and are connected with a main pipeline, and the main pipeline is connected with the import of the hydrogen side oil return tank.

[0012] Further, the branch pipeline connected with the turbine end defoaming chamber is provided with a U-shaped pipe section.

[0013] Further, a differential pressure valve is arranged on the pipeline between the filter and the sealing ring cavity of the generator, and two pressure ports of the differential pressure valve are respectively connected with a downstream pipeline and the bottom of the U-shaped pipe section through pipelines.

[0014] Further, the export of the hydrogen side oil return tank is provided with a first floating ball valve.

[0015] Further, the import of the vacuum oil tank is provided with a second floating ball valve.

[0016] Further, the export of the sealing oil storage tank is further connected with the cooler through an emergency pipeline, and an emergency pump is arranged on the emergency pipeline.

[0017] Further, the export of the filter is connected with floating oil chambers outside sealing pads at two ends of the generator through a pipeline, and a flow control valve is arranged on the pipeline.

[0018] The utility model discloses a beneficial effect is: the structure design is reasonable, utilize pressure balance pipe can effectively solve the gas expansion of hydrogen side oil tank gas when generator inside gas decompression, the phenomenon of " air plug " of oil return pipe when flowing into generator along oil return pipe, thereby avoiding the generator of high liquid level of generator defoaming chamber causes the oil of generator. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structure schematic diagram of single -flow ring sealing oil system of the utility model's no oil return expansion tank,

[0020] Figure 2 It is the local structure schematic diagram of single -flow ring sealing oil system of the utility model's no oil return expansion tank.

[0021] In the drawings, the component list of each sign represented is as follows:

[0022] 1, sealing oil storage tank;2, hydrogen side oil return tank;3, vacuum oil tank;4, generator;5, cooler;6, filter;7, pressure balance pipe;8, control valve;9, differential pressure valve;41, turbine end defoaming chamber;42, exciter end defoaming chamber;411, U-shaped pipe section. DETAILED DESCRIPTION

[0023] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and are not used to limit the scope of the utility model.

[0024] EMBODIMENT

[0025] As Figure 1 And 2 Indicated, the single -flow ring sealing oil system of the utility model's no oil return expansion tank includes sealing oil storage tank 1, hydrogen side oil return tank 2 and vacuum oil tank 3, the import of hydrogen side oil return tank 2 is connected with turbine end defoaming chamber 41 and exciter end defoaming chamber 42 of generator 4 through pipeline, the export of hydrogen side oil return tank 2 is connected with the import of vacuum oil tank 3 through pipeline, the import of sealing oil storage tank 1 is connected with the bearing box oil discharge port of generator 4 through pipeline, the export of sealing oil storage tank 1 is connected with the import of vacuum oil tank 3 through pipeline, the export of vacuum oil tank 3 is connected with cooler 5, filter 6 and sealing ring cavity of generator 4 in proper order through pipeline, the gas side space of turbine end defoaming chamber 41 and exciter end defoaming chamber 42 is communicated in the inside of generator 4, the upper portion of turbine end defoaming chamber 41 and / or exciter end defoaming chamber 42 is connected with the inner chamber top of hydrogen side oil return tank 2 through pressure balance pipe 7.

[0026] In the single-flow ring seal oil system of the oil-return-free enlarged groove of the embodiment, the oil discharged from the hydrogen side of the seal ring at the turbine end and the exciter end of the generator 4 enters the turbine end defoaming chamber 41 and the exciter end defoaming chamber 42 of the generator 4. The seal oil flows from the turbine end defoaming chamber 41 and the exciter end defoaming chamber 42 into the hydrogen side oil return tank 2, which functions to block the gas leakage. Normally, the gas side space pressure in the hydrogen side oil return tank 2 (in the turbine end defoaming chamber 41 and the exciter end defoaming chamber 42) is consistent with the gas pressure in the generator 4. Since the horizontal pipeline is inevitably arranged on site, although the original installation instruction requires that the horizontal pipeline has an inclination of at least 1 / 1000 downward, when the amount of seal oil at the hydrogen side of the seal ring abnormally increases (the oil-hydrogen differential pressure increases during the generator voltage reduction process, the long-time running (or rubbing) gap of the seal shoe becomes large, etc.), or the oil return pipeline has a negative slope due to the loosening of the support hanger, the seal oil will fill the horizontal pipeline section of the hydrogen side oil return pipeline. During the process of reducing the voltage of the generator 4, the high-pressure gas in the hydrogen side oil return tank 2 expands, and most of the gas will flow upward along the pressure balance pipeline 7 to the gas side space of the turbine end defoaming chamber 41 and the exciter end defoaming chamber 42, and will not form a "gas plug" in the oil return pipeline connecting the hydrogen side oil return tank 2 and the defoaming chamber, thereby preventing the oil return, and thus preventing the oil level in the turbine end defoaming chamber 41 and the exciter end defoaming chamber 42 from rising and causing the generator to be filled with oil.

[0027] In the embodiment, the control valve 8 is arranged on the pressure balance pipeline 7. By adjusting the control valve 8, the flow rate or on-off state of the pressure balance pipeline 7 can be adjusted, and the use is relatively flexible.

[0028] In the embodiment, the control valve 8 is an electromagnetic valve, and is connected to a controller. By controlling the controller, the control valve 8 can be controlled, and the operation is relatively flexible.

[0029] In the embodiment, the turbine end defoaming chamber 41 and the exciter end defoaming chamber 42 (the liquid side spaces of the two) are respectively connected to branch pipelines, the branch pipelines are combined and connected to a main pipeline, and the main pipeline is connected to the inlet of the hydrogen side oil return tank 2.

[0030] In the embodiment, a U-shaped pipeline section 411 is arranged on the branch pipeline connected to the turbine end defoaming chamber 41. The U-shaped pipeline section 411 can avoid the problem that the oil fume circulates in the generator 4 due to the inconsistency of the air pressure at the two ends of the generator 4.

[0031] In the embodiment, a first floating ball valve is arranged at the outlet of the hydrogen side oil return tank 2. The first floating ball valve can control the oil outlet according to the oil level in the hydrogen side oil return tank 2, and the outlet is opened when the oil level is higher than a set value, and the outlet is closed when the oil level is lower.

[0032] In the embodiment, a differential pressure valve 9 is arranged on the pipeline between the filter 6 and the seal ring cavity of the generator 4, two pressure ports of the differential pressure valve 9 are connected with the downstream pipeline and the bottom of the U-shaped tube segment 411 through pipelines respectively, so that the oil pressure is greater than the hydrogen pressure in the generator 4.

[0033] In the embodiment, the inlet of the vacuum oil tank 3 is provided with a second floating ball valve. The second floating ball valve can control the oil inlet according to the oil level in the vacuum oil tank 3, and the inlet is opened when the oil level is low, and the inlet is closed when the oil level is high.

[0034] In the embodiment, the outlet of the seal oil storage tank 1 is also connected with the cooler 5 through an emergency pipeline (denoted by b in the figure), and an emergency pump (denoted by e in the figure) is arranged on the emergency pipeline. The emergency pipeline can pump the oil in the seal oil storage tank 1 into the generator 4 in an emergency.

[0035] In the embodiment, the outlet of the filter 6 is connected with the floating oil chamber outside the seal ring of the generator 4 through a pipeline, and a flow control valve (denoted by f in the figure) is arranged on the pipeline. The pipeline can provide a certain pressure to balance the hydrogen pressure force of the hydrogen side end face of the seal ring, so that the seal ring of the generator 4 does not stick to the seal ring shell and jam.

[0036] In the description of the utility model, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, structure and operation, and therefore cannot be understood as limiting the utility model.

[0037] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0038] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can indirectly connect through intermediate medium, can be the communication of two element interiors or the interaction of two elements, unless another definite limitation.For ordinary skilled in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0039] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be direct connection, also can indirectly connect through intermediate medium, can be the communication of two element interiors or the interaction of two elements, unless another definite limitation.For ordinary skilled in the art, can understand the specific meaning of the above terms in the utility model according to specific circumstances.

[0040] In the description of the specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0041] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and modify the above-mentioned embodiments within the scope of the utility model.

Claims

1. A single flow ring seal oil system with no return oil expansion tank, characterized by: The application relates to a sealing oil storage tank (1), a hydrogen-side oil return tank (2) and a vacuum oil tank (3), wherein the inlet of the hydrogen-side oil return tank (2) is connected with the turbine-end defoaming chamber (41) and the exciter-end defoaming chamber (42) of a generator (4) through pipelines, the outlet of the hydrogen-side oil return tank (2) is connected with the inlet of the vacuum oil tank (3) through a pipeline, the inlet of the sealing oil storage tank (1) is connected with the bearing box oil discharge port of the generator (4) through a pipeline, the outlet of the sealing oil storage tank (1) is connected with the inlet of the vacuum oil tank (3) through a pipeline, the outlet of the vacuum oil tank (3) is sequentially connected with a cooler (5), a filter (6) and the sealing ring cavity of the generator (4) through pipelines, the gas side spaces of the turbine-end defoaming chamber (41) and the exciter-end defoaming chamber (42) are in communication, and the gas side spaces of the turbine-end defoaming chamber (41) and / or the exciter-end defoaming chamber (42) are connected with the top of the inner cavity of the hydrogen-side oil return tank (2) through a pressure balance pipe (7).

2. A single flow ring seal oil system with no return oil expansion groove according to claim 1, characterized in that: A control valve (8) is arranged on the pressure balance pipe (7).

3. A single flow ring seal oil system with no return oil expansion groove according to claim 2, characterized in that: The control valve (8) is an electromagnetic valve and is connected with a controller.

4. A single flow ring seal oil system with no return oil expansion groove according to claim 1, characterized in that: The turbine-end defoaming chamber (41) and the exciter-end defoaming chamber (42) are respectively connected with branch pipelines, the branch pipelines are combined and connected with a main pipeline, and the main pipeline is connected with the inlet of the hydrogen-side oil return tank (2).

5. A single flow ring seal oil system with no return oil expansion groove according to claim 4, characterized in that: A U-shaped pipe section (411) is arranged on the branch pipeline connected with the turbine-end defoaming chamber (41).

6. A single flow ring seal oil system with no return oil expansion groove according to claim 5, characterized in that: A differential pressure valve (9) is arranged on the pipeline between the filter (6) and the sealing ring cavity of the generator (4), and two pressure ports of the differential pressure valve (9) are respectively connected with a downstream pipeline and the bottom of the U-shaped pipe section (411) through pipelines.

7. A single flow ring seal oil system with no return oil expansion groove according to claim 1, characterized in that: A first floating ball valve is arranged on the outlet of the hydrogen-side oil return tank (2).

8. A single flow ring seal oil system with no return oil expansion groove according to claim 1, characterized in that: A second floating ball valve is arranged on the inlet of the vacuum oil tank (3).

9. A single flow ring seal oil system with no return oil expansion groove according to claim 1, characterized in that: The outlet of the sealing oil storage tank (1) is also connected with the cooler (5) through an emergency pipeline, and an emergency pump is arranged on the emergency pipeline.

10. A single flow ring seal oil system without return oil expansion groove according to any one of claims 1 to 8, characterized in that: The outlet of the filter (6) is connected with the sealing shoe outer floating oil chamber at both ends of the generator (4) through a pipeline, and a flow control valve is arranged on the pipeline.

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