JP2528376Y2 - Sealing oil control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial Application Field) The present invention relates to a sealing oil supply device for a rotating electric machine such as a hydrogen gas cooled turbine generator.

(Prior Art) Generally, large-capacity rotating electric machines such as turbine generators
Hydrogen gas is sealed in the machine, and the hydrogen gas is circulated through a hydrogen gas cooler to suppress a temperature rise due to heat generated by the rotating electric machine to a predetermined value. This hydrogen gas is extremely efficient in a normal condition and exerts its power as a safe cooling medium.However, if it mixes with air due to leakage to the outside or mixing of air, it may be explosive under certain conditions It becomes a mixed gas.

Therefore, in order to prevent hydrogen gas from leaking from the shaft penetration portion of the rotating electric machine to the atmosphere, a shaft sealing device is provided, and sealing oil is supplied to the shaft sealing device to seal the hydrogen gas.

FIG. 2 shows a system of a conventional sealing oil supply device. In FIG. 2, (1) is a turbine generator, (2) is a bearing device of the turbine generator (1), and (3) is a turbine generator (1).
A shaft sealing device for sealing the hydrogen gas enclosed in the
(4) is a sealing oil supply pipe for supplying sealing oil to the shaft sealing device (3). (5) is an air extraction tank for collecting sealing oil supplied to the shaft sealing device (3) and diverted to the outside of the machine (air side) to temporarily store and extract air contained in the oil, and (6) a shaft sealing device ( This is an expansion tank for collecting and storing sealing oil supplied to 3) to the inside (hydrogen gas side) of the turbine generator (1) and separating the hydrogen gas mixed in the sealing oil. (7) is a float trap tank disposed in the return line of the sealing oil that communicates the expansion tank (6) and the air extraction tank (5), and hydrogen gas in the machine is filled with oil in the float trap tank (7). A valve interlocked with the float is provided so as not to leak out of the turbine generator (1) through the air extraction tank (5) due to the drop.

(9) collects the sealing oil evacuated in the air extraction tank (5) via the return pipe (8) and simultaneously with the turbine generator (1).
A lubricating oil tank for storing lubricating oil to be supplied to the bearing device (2), and (10) a lubricating oil tank (9) that uses the oil in the lubricating oil tank as a lubricating oil for the bearing via a lubricating oil supply pipe (24). An oil feed pump that supplies the oil to the device (2) and feeds the oil as a sealing oil to the sealing oil tank (14) via the conduit (12). (1
1) is an oil cooler that cools lubricating oil or sealing oil, (1)
7) Spray nozzle (15) in sealed oil tank (14),
Moisture contained in the sealing oil sprayed by (16),
A vacuum pump for vacuum degassing hydrogen gas, air, etc., via the suction pipe (13). (19) is a sealing oil pump for feeding the sealing oil in the sealing oil tank (14) to the shaft sealing device (3), and (22) is disposed on the discharge pipe (20) of the sealing oil pump (19). A pressure regulating valve that returns a part of the discharge amount of the sealing oil pump (19) to the sealing oil tank (14) via the recirculation circuit (23) and regulates the discharge pressure of the sealing oil pump (19) to a constant value. I do.

(21) The sealing oil pressure supplied to the shaft sealing device (3) is always higher by a predetermined pressure than the hydrogen gas pressure in the turbine generator (1) by increasing or decreasing the amount of sealing oil to the shaft sealing device (3). A differential pressure regulating valve provided so as to maintain the amount of sealing oil supplied to the sealing oil supply pipe (4) automatically according to each of the pressure signals introduced by the pressure detection pipes (21a) and (21b). I am adjusting.

(Problems to be Solved by the Invention) In the conventional sealing oil supply device configured as described above,
The vacuum pump (17) sucks in moisture contained in the sealing oil during vacuum degassing of the sealing oil, and a large amount of water accumulates in the drain chamber (28) of the vacuum pump (17). During normal operation, the drain valve (26) is operated to drain the water in the drain chamber (28), thereby operating without impairing the function of the vacuum pump (17).

In the permanent oil supply device with two vacuum pumps (17), one is always operated and the other is used as a spare machine.
The switching operation cycle of this pump is one to three months. When the operating vacuum pump (17) is stopped, the water extracted when the sealing oil is vacuum degassed remains in the drain chamber (28), and this water enters the cylinder of the vacuum pump (17). I do. In this state, the vacuum pump (17) is oxidized and rusted while sliding. However, when the rusted vacuum pump is started, the rotary sliding portion is abnormally worn due to rust, and the function of the vacuum pump (17) is reduced, and the load is increased to damage the vacuum pump driving motor.

The present invention has been made in view of such a drawback, and an object of the present invention is to provide a sealing oil supply device capable of smoothly restarting a vacuum pump without causing rust when the operation is stopped.

[Structure of device]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a tank for storing a sealing oil supplied to a shaft sealing device of a rotating electric machine filled with hydrogen gas and a vacuum evacuation of the tank 2 System, and each exhaust system includes a vacuum pump, an on-off valve provided on the suction side of the vacuum pump, a drain chamber provided on the exhaust side of the vacuum pump, and a sealing oil supplied to the tank. A refueling operation valve provided in a pipe for branching and supplying to the drain chamber, a level switch and a drain valve provided in the drain chamber, and an open / close valve of the other exhaust system is provided by an open signal of the open / close valve of one exhaust system. Is closed, the drain valve and the oil supply operation valve are opened, and a controller is provided for supplying a predetermined amount of oil into the drain chamber to perform a cleaning operation of the vacuum pump.

(Operation) In the sealing oil supply device of the present invention having such a configuration, part of the sealing oil is supplied from the supply line of the sealing oil to the drain chamber of the inactive exhaust system, so that the inside of the vacuum pump is reduced. Can be washed with clean oil. After the cleaning operation for a certain period of time, the controller stops the operation of the vacuum pump and closes the drain valve, so that clean oil is stored in the vacuum pump. This amount is detected by a level switch provided in the drain chamber, and the refueling operation valve is closed. In this way, the water in the vacuum pump is discharged out of the pump, and clean oil is held in the vacuum pump. As a result, the suspended exhaust system can be restarted normally without any trouble.

(Embodiment) An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, the same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

The lubricating oil supply pipe (24) that supplies oil to the bearing device (2) of the turbine generator (1) branches off from the conduit (12) that guides oil to the sealed oil tank (14), and further branches off the vacuum pump oil supply pipe (33). I do. A drain chamber (28a) is connected to the end of the vacuum pump oil supply pipe (33) via an automatic oil supply operation valve (27a) (27b).
(28b) is connected. Drain chamber (28a) (28b)
Automatic drain valves (26a) and (26b) are provided at the bottom of the. Further, automatic open / close valves (25a, 25b) are provided on a suction pipe (13) connecting the vacuum pumps (17a) (17b) and the sealed oil tank (14). A relay timer (31) for opening and closing the automatic on-off valves (25a) (25b), the automatic refueling operation valves (27a) (27b), and the automatic drain valves (26a) (26b);
a) Provide a relay (32) to operate (25b). Also,
Automatic refueling operation valve (27a) (2
7b) After the automatic drain valves (26a) (26b) perform a series of operations within a certain period of time, the level switches (29a) (29) (29) are used to store a certain amount of oil in the drain chambers (28a) (28b).
b) is provided.

In the sealing oil supply device configured as above, when the inside of the sealing oil tank (14) is evacuated by the vacuum pump (17b) and the sealing oil is degassed, the automatic on-off valve (25b) is opened by the relay (32). Open. At this time, the automatic refueling operation valve (27b) and the automatic drain valve (26b) are closed.

At this time, the vacuum pump (17a) closes the automatic on-off valve (25a) together with the stop signal, and the relay timer (3
The interlock of 1) is released and the cleaning operation starts.

The operation of the vacuum pump (17a) is not stopped immediately by the stop signal but is continued for a certain period of time by the relay (32). On the other hand, when the automatic on-off valve (25a) was closed,
The automatic drain valve (26a) is first opened by a signal from the relay timer (31), and the water and oil in the drain chamber (28a) are discharged. After a predetermined amount is discharged several seconds later, the drain valve (26a) is closed by the relay timer (31), the automatic refueling operation valve (27a) is opened, and the refueling pipe (3) is opened.
Supply clean oil from 3) into the drain chamber (28a). Then, the vacuum pump (17a) is rotated to circulate the oil to clean the inside of the vacuum pump (17a).

Since the operation time for this cleaning may be a fixed short time, the vacuum pump (17a) stops at the set time of the relay (32). Next, a signal is sent to the relay timer (31) by the level switch (29a) provided in the drain chamber (28a), the automatic refueling operation valve (27a) is closed, and the vacuum pump (17a) is activated by storing oil. Stored in a rust-proof condition.

As described above, according to the present embodiment, when the operation of the vacuum pump is stopped, the inside of the vacuum pump is washed with clean oil, and the inside of the pump is stored in oil. , The vacuum pump can be operated constantly.

Also, even during normal operation, automatic drain and automatic lubrication can be performed by operating the automatic drain valve and the automatic lubrication operation valve in conjunction with the oil level detection signal of the level switch of the drain chamber.

[Effect of the invention]

As described above, according to the present invention, since the inside of the sealed oil vacuum pump is always kept in a clean state, it is not necessary to confirm before starting and the like, and the rotary electric machine can be operated efficiently. In addition, the life of the vacuum pump can be extended.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main part of a sealing oil supply device showing one embodiment of the present invention, and FIG. 2 is a diagram showing a conventional sealing oil supply device. 1 ... rotating electric machine 3 ... shaft sealing device 14 ... sealing oil tank 17a, 17b ... vacuum pump 25a, 25b ... automatic on-off valve 26a, 26b ... automatic drain valve 27a, 27b ... automatic lubrication operation valve 28a , 28b …… Drain chamber 29a, 29b …… Level switch

Claims (1)

(57) [Scope of request for utility model registration] 1. A tank for storing sealing oil supplied to a shaft sealing device of a rotating electric machine filled with hydrogen gas, and two exhaust systems for evacuating the tank, wherein each exhaust system includes a vacuum pump and a vacuum pump. An on-off valve provided on the suction side of the vacuum pump, a drain chamber provided on the exhaust side of the vacuum pump, and a pipe branched from a pipe for supplying sealing oil to the tank and supplying sealing oil to the drain chamber. A refueling operation valve provided, a level switch and a drain valve provided in the drain chamber, and an open / close valve of one exhaust system closes the other exhaust system open / close valve and opens the drain valve to open the drain chamber. Drain the water and oil, then close the drain valve and open the oil supply operation valve to supply clean oil into the drain chamber, circulate this oil through the vacuum pump and clean the inside of the vacuum pump. Sealing oil supply device characterized by comprising a controller for such store the oil in the vacuum pump is closed by a signal level switch refueling valve.