CN222377226U - Single-flow ring type sealing oil system of generator - Google Patents

Abstract

The utility model provides a generator single-flow ring sealing oil system, including a sealing oil tank, a sealing oil pump and an oil inlet pipeline. A sealing shoe is arranged on the outside of the generator rotor shaft. The oil inlet pipeline is connected to the sealing shoe, and the sealing oil pump is used to supply oil to the sealing shoe for sealing. A hydrogen side oil return pipeline is arranged on one side of the sealing shoe, and its end is connected to a sealing oil expansion tank. The rear end of the sealing oil expansion tank is connected to a first float oil tank and a second float oil tank arranged in parallel, and the first float oil tank is provided with a first float oil tank bypass pipeline. The problems of oil inlet and hydrogen leakage of the generator caused by the generator are avoided, the damage of the generator oil inlet is prevented, the explosion accident caused by hydrogen leakage of the generator is avoided, and the consumption of a large amount of hydrogen supplement caused by hydrogen leakage of the generator is prevented, the reliability of the equipment is improved, and the economic benefits for the enterprise are increased.

Description

Single-flow ring type sealing oil system of generator

Technical Field

The utility model relates to the technical field of generator shaft sealing, in particular to a single-flow ring type sealing oil system of a generator.

Background

The hydrogen cooling generator adopts hydrogen cooling, in order to prevent hydrogen from leaking outwards along the rotor shaft in operation and causing fire or explosion, the unit is provided with a sealing oil system, namely sealing oil higher than hydrogen pressure is circularly supplied to a sealing bush at the joint of the rotating shaft and the end cover. As shown in figure 1, the sealing oil system adopts a uniflow ring type sealing bush, only one path of sealing oil path respectively enters the sealing bush at the turbine side and the exciter side, and flows to the air side and the hydrogen side along an axial gap through the middle oil hole, so that the formed oil film plays a role in sealing and lubricating. Then the oil is returned in two paths (hydrogen side and air side), the oil flows to the hydrogen side and is discharged to the expansion tank, then enters the sealed oil float oil tank and finally returns to the sealed oil tank, and the oil flows to the air side and the bearing return oil is discharged to the air separation tank.

The existing sealed oil float oil tank is only provided with one float oil tank, and the float oil tank has the function of further separating hydrogen in oil and controlling the normal oil level of the expansion tank through automatic adjustment of a float valve. The float oil tank is internally provided with a float valve for automatically controlling the oil level so as to keep the oil level in the oil tank within a certain range.

However, the existing single-flow ring type sealing oil system has the following defects:

(1) The ball float valve in the sealed oil float oil tank is easy to be blocked, the phenomenon that the oil level of the oil tank is too high or too low occurs, the oil level is too high, the sealed oil return of the generator is not smooth, the oil is fed into the generator, the hydrogen in the generator flows out in a large amount due to the too low oil level, and the risk of hydrogen explosion exists.

(2) When the float valve of the sealed oil float oil tank is overhauled, the float oil tank needs to be isolated, the operation is switched to bypass operation, and a bypass system does not have a bypass pipeline and a balance door, so that a large amount of hydrogen in the generator can flow out.

(3) The volume of the sealed oil float oil tank bypass system is smaller, a float valve is not arranged, the liquid level cannot be effectively controlled, the fluctuation of the liquid level is large, the oil return is not smooth, the oil inlet of the generator can be caused, meanwhile, separated gas cannot be recovered, the hydrogen leakage amount can reach 200m < 3 >/day, and the oil inlet and hydrogen leakage accidents of the generator are easily caused. In view of this, a generator single-flow ring seal oil system is proposed.

Disclosure of Invention

The technical scheme adopted for solving the background technical problems is as follows:

The utility model provides a generator uniflow ring type seal oil system, including sealed oil tank, sealed oil pump and oil inlet pipe, be provided with the sealed tile in the generator rotor shaft outside, the oil inlet pipe with sealed tile communicates, and through sealed oil pump to carry out the fuel feeding seal in the sealed tile one side is provided with hydrogen side oil return pipe, and its end communicates in sealed oil expansion tank, sealed oil expansion tank rear end intercommunication has first float oil tank and the second float oil tank of parallel arrangement, first float oil tank is provided with first float oil tank bypass pipeline, the second float oil tank is provided with second float oil tank bypass pipeline be provided with first float oil tank bypass pressure balance door on the first float oil tank bypass pipeline be provided with second float oil tank bypass pressure balance door on the second float oil tank bypass pipeline, first float oil tank rear end, second float oil tank rear end, first float oil tank bypass pipeline rear end and second float oil tank bypass pipeline rear end are through oil return pipe and seal oil tank intercommunication.

Preferably, the first float oil tank is provided with a first float oil tank pressure balance gate, the second float oil tank is provided with a second float oil tank pressure balance gate, and the first float oil tank pressure balance gate and the second float oil tank pressure balance gate are arranged in pipeline communication.

Preferably, the first float tank pressure balance gate and the second float tank pressure balance gate are both automatic gates.

Preferably, the first and second float tank pressure balance gates are in communication with the seal oil expansion tank through an expansion tank pressure balance master gate.

Preferably, a pressure balance pipeline is arranged between the first float oil tank bypass pipeline and the second float oil tank bypass pipeline, is connected with the sealed oil expansion tank, and is provided with an automatic exhaust valve.

Preferably, the first float oil tank and the second float oil tank are identical in specification and model.

The utility model has the beneficial effects that two parallel float oil tanks which can work independently are arranged in the sealing oil system, when one float oil tank has a problem, the other float oil tank can work normally, bypass pipelines are respectively arranged corresponding to the two float oil tanks, oil inlet doors are respectively added, the separate operation can be conveniently carried out, and the bypass pipelines can work independently through the balance doors when the float oil tank fails or is maintained. The problems of oil inlet and hydrogen leakage of the generator caused by the leakage of the generator are avoided, the oil inlet damage of the generator is prevented, the explosion accident caused by the hydrogen leakage of the generator is avoided, the consumption of a large amount of hydrogen supplementing caused by the hydrogen leakage of the generator is prevented, the reliability of equipment is improved, and the economic benefit is increased for enterprises.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a conventional single-flow ring seal oil system and motor shaft installation structure provided by an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an improved structure of a single-flow ring seal oil system according to an embodiment of the present utility model;

In the figure, a 1-sealed oil tank, a 2-sealed oil pump, a 3-oil inlet pipeline, a 4-generator, a 5-sealed tile, a 6-hydrogen side oil return pipeline, a 7-sealed oil expansion tank, an 8-first float oil tank, a 9-second float oil tank, a 10-first float oil tank bypass pipeline, a 11-second float oil tank bypass pipeline, a 12-first float oil tank bypass pressure balance door, a 13-second float oil tank bypass pressure balance door, a 14-first float oil tank pressure balance door, a 15-second float oil tank pressure balance door, a 16-expansion tank pressure balance total door and a 17-oil return pipeline are arranged.

Detailed Description

The above-described aspects are further described below in conjunction with specific embodiments. It is to be understood that these examples are illustrative of the utility model and are not intended to limit the scope of the utility model. The implementation conditions used in the examples may be further adjusted according to the conditions of the specific manufacturer, and the implementation conditions not specified are generally those in routine experiments.

In a specific embodiment, a generator single-flow ring type seal oil system is provided, which is the same as the prior art in that it includes a seal oil tank 1 for storing seal oil, a seal oil pump 2 for seal oil supply, and an oil feed pipe 3. The outside of the rotor shaft of the generator 4 is provided with a sealing tile 5, the oil inlet pipeline 3 is communicated with the sealing tile 5, and oil is supplied to the sealing tile 5 for sealing through the sealing oil pump 2, and sealing oil flows along the gap between the sealing tile 5 and the rotor shaft through the middle oil hole along the axial air side and the hydrogen side, so that the sealing tile 5 and the rotor shaft of the generator 4 form an oil film to play a role in sealing and lubricating.

In this case, in order to recover these seal oils, the return oil on the air side is discharged into the air separation tank, while the seal oil on the hydrogen side is discharged into the seal oil expansion tank 7, then enters the float oil tank for further oil-gas separation, and finally returns into the seal oil tank 1. Therefore, in this example, a hydrogen side oil return pipe 6 is provided on the seal shoe 5 side, and its end is connected to a seal oil expansion tank 7.

In this example, in order to realize that the sealed oil float oil tank can keep stable work in the system, this example sets up two sets of float oil tanks and supporting system, and two float oil tanks can be parallel and independent operation. The types and the specifications of the two float oil tanks are consistent, and a bypass system is arranged corresponding to each float oil tank. The method comprises the following steps:

The sealed oil expansion tank 7 rear end intercommunication has first float oil tank 8 and the second float oil tank 9 of setting side by side, and first float oil tank 8 is provided with first float oil tank bypass pipeline 10, and second float oil tank 9 is provided with second float oil tank bypass pipeline 11, is provided with first float oil tank bypass pressure balance door 12 on first float oil tank bypass pipeline 10, is provided with second float oil tank bypass pressure balance door 13 on second float oil tank bypass pipeline 11, and the effect of balance door is to ensure that the oil tank liquid level is stable and retrieve the gas that separates simultaneously, and after the bypass pipeline increases the balance door, the hydrogen leakage volume can drop to 30m 3/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 pipe 10 and the rear end of the second float oil tank bypass pipe 11 are communicated with the sealed oil tank 1 through an oil return pipe 17.

When the device is used, if one float oil tank fails, the other float oil tank can work normally to ensure that the hydrogen leakage amount is lower than 12m < 3 >/day, so that the device is prevented from being stopped, when the other float oil tank fails, the device is manually switched to the bypass pipeline of the one float oil tank to operate, the hydrogen leakage amount can be controlled to be reduced to 30m < 3 >/day, and the device can also maintain the normal operation of the device because the hydrogen supplementing capability is 60m < 3 >/h, and when the bypass pipeline of the float oil tank fails to operate, the device can also be switched to the bypass pipeline of the other float oil tank to operate. Therefore, the problem of oil inlet and hydrogen leakage of the generator caused by non-stop Fang Sheng of the unit is avoided, the oil inlet damage of the generator is prevented, the explosion accident caused by the hydrogen leakage of the generator is avoided, the consumption of a large amount of hydrogen supplementing caused by the hydrogen leakage of the generator is prevented, the reliability of equipment is improved, and economic benefits are increased for enterprises.

In order to prevent the oil storage from blocking the pressure balance pipeline to affect the normal operation of the other float oil tank after the fault of one float oil tank is full of oil, 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 arranged in pipeline communication. Here, the first float tank pressure balance gate 14 and the second float tank pressure balance gate 15 are both automatic gates, which can automatically vent gas, and gas can normally pass but sealing oil cannot pass.

Further, the first and second float tank pressure balance gates 14, 15 are in communication with the seal oil expansion tank 7 through the expansion tank pressure balance total gate 16. The pressure balance of the float oil tank and the sealed oil expansion tank 7 is kept, hydrogen separated from oil in the float oil tank flows back to the expansion tank, and the phenomenon that the oil return of the expansion tank is not smooth due to the pressure build-up in the float oil tank is prevented.

In order to increase the volume of the bypass pipe system and to increase the operational reliability of the bypass pipe system, a pressure balance pipe is arranged between the first and second float tank bypass pipes 10, 11, connected to the seal oil expansion tank 7, and an automatic exhaust valve is arranged on the pressure balance pipe.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (6)

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 on the outer side of 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 of the hydrogen side oil return pipeline (6) is connected to the 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) arranged in parallel, and the first float oil tank (8) and the second float oil tank (9) are connected to each other. The oil tank (8) is provided with a first float oil tank bypass pipe (10), the second float oil tank (9) is provided with a second float oil tank bypass pipe (11), the first float oil tank bypass pipe (10) is provided with a first float oil tank bypass pressure balance valve (12), and the second float oil tank bypass pipe (11) is provided with a second float oil tank bypass pressure balance valve (13); 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 pipe (10) and the rear end of the second float oil tank bypass pipe (11) are connected to the sealed oil tank through an oil return pipe (17). 2. A generator single-flow ring sealing oil system as described in claim 1, characterized in that the first float oil tank (8) is provided with a first float oil tank pressure balance gate (14), the second float oil tank is provided with a second float oil tank pressure balance gate (15), and the first float oil tank pressure balance gate (14) and the second float oil tank pressure balance gate (15) are connected by a pipeline. 3. A generator single-flow ring sealing oil system as described in claim 2, characterized in that the first float oil tank pressure balance door (14) and the second float oil tank pressure balance door (15) are both automatic doors. 4. A generator single-flow ring sealing oil system as described in claim 3, characterized in that the first float oil tank pressure balance gate (14) and the second float oil tank pressure balance gate (15) are connected to the sealing oil expansion tank (7) through an expansion tank pressure balance main gate (16). 5. A generator single-flow ring sealing oil system as described in claim 1, characterized in that a pressure balancing pipe is arranged between the first float oil tank bypass pipe (10) and the second float oil tank bypass pipe (11), which is connected to the sealing oil expansion tank (7), and an automatic exhaust valve is arranged on the pressure balancing pipe. 6. A generator single-flow ring sealing oil system as described 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.