JPH0224108B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sealing oil supply device for a rotating electrical machine, and more specifically, a system for supplying sealing oil to a shaft sealing part of a rotating electrical machine filled with hydrogen gas. The present invention relates to a sealing oil supply device.

[Prior Art] Fig. 2 shows a conventional device of this type, in which a bearing 3 and a sealer 4 are arranged at both ends of a shaft 2 of a rotating electric machine 1, and a bearing oil supply pipe 5 and a sealing oil supply pipe 5 are provided, respectively. A bubble removing box 7 is connected to the supply pipe 6 and installed for the purpose of temporarily retaining the sealing oil discharged from the sealer 4 to the inside of the rotating electrical machine and removing air bubbles in the sealing oil.
An oil level alarm 8 is provided to detect an abnormal oil level inside. Further, there is a bearing oil drain pipe 9 through which the sealing oil discharged from the sealer 4 to the outside of the rotating electric machine and bearing oil discharged from the bearing 3 flow together, and a sealing oil drain through which the sealing oil discharged from the bubble removal box 7 flows. Oil pipe 10, loop seal tank 1 for temporarily retaining sealed oil waste oil and bearing waste oil and exhausting hydrogen gas and air
1. Bearing oil return pipe 12, seal oil return pipe 13, oil leveling box 14 that shuts off hydrogen gas by always maintaining a constant sealed oil level, automatically keeps the oil level in the oil leveling box 14 constant Float valve 1 to maintain
5. An oil level alarm 16 that detects an abnormal oil level in the oil leveling box 14; a vacuum tank 17 that deaerates hydrogen gas and air from the sealed oil; An inlet float valve 18 for automatically maintaining a constant level, an oil level alarm 19 for detecting an abnormal oil level in the vacuum tank 17, a spray nozzle pipe 20 for spraying sealing oil to promote deaeration, and this spray nozzle pipe. In order to deaerate the sealing oil sprayed from 20, there is a deaeration tray 21 configured in multiple stages so that the sealing oil maintains a wide surface area and flows slowly, a pump suction pipe 22, a vacuum exhaust pipe 23, a vacuum pump unit 24, and an atmosphere discharge. Pipe 25, regular pump 26 driven by AC power, emergency pump 27 driven by DC power, relief valve 28, check valve 29, sealer 4
a differential pressure regulating valve 30 that adjusts the pressure so that the sealed oil pressure is always higher than the in-machine hydrogen gas pressure by a certain value;
A seal oil supply pipe 31 for backing up from the bearing oil system in the event of an abnormality in the regular pump 26 or the emergency pump 27, a cooler 32, and a filter for always sending cooled clean oil to the sealer 4. 33 etc., and by guiding the bypassed oil from the regular pump 26 through the differential pressure regulating valve 30 to the spray nozzle pipe 20, the oil is recirculated to the vacuum tank 17 and a deaeration effect is achieved. It was increasing.

In the conventional sealing oil supply device for a rotating electric machine configured as described above, the sealing oil led from the oil leveling box 14 passes through the float valve 15, the sealing oil return pipe 13, and the float valve 18 to the vacuum tank 17. Sent.
A float valve 18 provided in the vacuum tank 17 opens the float valve 18 when the oil level in the vacuum tank 17 decreases, and conversely closes the float valve 18 when the oil level rises. Controls the oil level. Further, the sealing oil led from the oil leveling box 14 and containing a small amount of hydrogen gas and air dissolved therein is sent directly from the float valve 18 to the oil tank of the vacuum tank 17, and is vacuum degassed by the vacuum pump 24. Seal oil is sucked in by a service pump 26. At this time, the gas contained in the sealing oil entering from the float valve 18 is rapidly degassed the moment it enters the vacuum tank 17, so the state of the sealing oil in the vacuum tank 17 changes at the outlet of the float valve 18. Bubbles are generated, the oil surface becomes foamy, and the sealing oil in the vacuum tank 17 also becomes foamy.

[Problems to be Solved by the Invention] In the conventional sealing oil supply device for a rotating electric machine as described above, when sealing oil containing bubbles is led to the pump 26, cavitation occurs within the pump 26, and abnormal noise is generated. I had a problem. In particular, when the height difference between the vacuum tank 17 and the pump 26 is small, the oil head pressure at the inlet of the pump 26 is small.
As the pump suction pressure decreases, the above phenomenon becomes noticeable. In addition, since the sealing oil led to the sealer 4 contains hydrogen gas and air, if the deaeration is not sufficient, a small amount of air may enter the rotating electrical machine 1, causing a decrease in the purity of the hydrogen gas. I was getting used to it. Furthermore, the floats of the float valve 18 and the oil level alarm 19 are floated to the surface by the foaming of the oil surface, making it impossible to obtain a normal oil level in the vacuum tank 17.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it prevents cavitation of the pump and a decrease in the purity of hydrogen gas in the rotating electric machine, and also improves the rotation so that a normal oil level can be obtained in the vacuum tank. The purpose is to obtain a sealing oil supply device for electrical machinery.

[Means for solving the problem] A sealing oil supply device for a rotating electric machine according to the present invention includes:
It is equipped with a degassing bypass pipe that guides the sealed oil that enters from the float valve at the inlet of the sealed tank to the degassing pan.

[Operation] In this invention, the hydrogen gas and air dissolved in the sealing oil are slowly degassed, and bubbling inside the vacuum tank is prevented.

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. In the figure, reference numerals 1 to 33 are the same parts as in FIG. 2, and their explanation will be omitted. 34
is a degassing bypass pipe for guiding the sealing oil led from the oil leveling box 14 to the vacuum tank 17 to the degassing pan 21 of the vacuum tank 17.

Next, the operation will be explained. With the above configuration, the degassing bypass pipe 34 is provided in the vacuum tank 17 to guide sealing oil from the outlet of the float valve 18 to the upper part of the degassing pan 21 configured in multiple stages.
Bubbles produced from the sealing oil led into the vacuum tank 17 from the oil leveling box 14 can be removed while the sealing oil slowly flows over the degassing pan 21 configured in multiple stages.

Therefore, the amount of bubbles contained in the sealing oil is reduced, cavitation of the pump 26 is prevented, and the operation of the float of the float valve 18 and the oil level alarm 19 can be stabilized.

Further, the sealing oil introduced from the oil leveling box 14 into the vacuum tank 17 is placed in a degassing pan 21 configured in multiple stages.
Since the sealing oil is sufficiently degassed while slowly flowing above, the air contained in the sealing oil is reduced, and a decrease in hydrogen gas purity within the rotating electric machine 1 can be prevented.

[Effects of the Invention] As described above, according to the present invention, the deaeration effect can be improved, and cavitation does not occur even if the vacuum tank is installed at a low position, so the entire device can be made compact. , the equipment can be made at low cost. In addition, since air bubbles in the vacuum tank can be removed, the stability of the float valve is improved, and a decrease in hydrogen gas purity can be prevented.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is a system diagram of a conventional device. 1... Rotating electric machine, 3... Bearing, 4... Sealer,
14... Oil leveling box, 17... Vacuum tank, 20
...Spray nozzle pipe, 21 ... Deaeration plate, 26...
...Regular pump, 27...Emergency pump, 29...
Differential pressure regulating valve, 32...cooling pipe, 34...deaeration bypass pipe. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A sealer disposed at both ends of a shaft of a rotating electrical machine filled with hydrogen gas and supplied with sealing oil; and a sealing device that receives the sealing oil discharged from the sealer into the inside of the rotating electrical machine, and receives the sealing oil. an oil leveling box that always maintains a constant oil level and shuts off the hydrogen gas, and a vacuum that receives the sealing oil discharged from the oil leveling box and degasses the hydrogen gas and air from the sealing oil. a tank, a vacuum tank inlet float valve for guiding the sealing oil into the vacuum tank and controlling the sealing oil level at a constant level, a spray nozzle pipe disposed in the vacuum tank and spraying the sealing oil, and the sprayer. a degassing pan configured in multiple stages to receive the sealing oil injected from the nozzle pipe, and a regular seal whose suction side is connected to the vacuum tank and the discharge side is connected to the sealer and the spray nozzle pipe via a differential pressure regulating valve. In the sealing oil supply device that supplies the sealing oil to the sealer of the shaft sealing portion of the rotating electrical machine, the sealing oil supply device includes an oil pump and deaerates the sealing oil that enters the vacuum tank from the vacuum tank inlet float valve. A sealing oil supply device for a rotating electric machine, characterized in that it is equipped with a degassing bypass pipe leading to the upper part of a dish.