JPS5837352A - Fly-wheel device for storage of electric power - Google Patents

Abstract

PURPOSE:To raise the efficiency of a fly-wheel device while facilitating to keep a high vacuum condition by providing a degassing device to remove gases in waste oil extracted from the oil-sealed portion of the fly-wheel shaft. CONSTITUTION:When lubricating oil flows from an oil tank 27 to a lubricating oil pump 11, the occurrence of negative pressure at the inlet of the oil pump 11 is avoided because of the pressure of a head Hp. The oil from the oil pump 11 enters the upper and lower seals 6 and 7, and waste oil on the open air side enters an atmospheric pressure tank 20 due to the presence of the head difference Ha. In a degassing tank 21, degassing is made by a vacuum pump 24 for degassing and a nozzle 23 for oil spraying, and the degassed oil is lastly circulated to the oil tank 27. Also, waste oil on the vacuum side enters the oil tank 27 due to head difference Hv and its circulation is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in flywheel devices for power storage.

An outline of a conventional device of this type is shown in FIG. In the figure, 1 is a flywheel, 2 is a generator/electric motor, 3 is an upper bearing, 4 is a lower bearing, 5 is an emergency thrust bearing, 6 is an upper seal, and 7 is a lower seal.

8 is a casing, 9 is a vacuum pump, 10 is an oil tank, 1
1 is a lubricating oil, 12 is a magnetic bearing.

When storing electric power in the flywheel 1, the electric motor 2 acts as a motor to increase the rotational speed of the flywheel 1 and store it as energy for one rotation. Conversely, when generating electricity, the generator/motor driven by the flywheel 1 is operated as a generator, and the rotational energy of the flywheel 10 is converted into gravity. In order to reduce the energy loss during storage, (a) most of the weight of the flywheel l is supported by the magnetic bearing 12 to reduce the energy loss of the bearings 3 and 4, and (b) the inside of the casing 8 is moved by a vacuum ponder 9.
- By making the flywheel 1 empty, the damage caused by damage to the flywheel 1 is reduced.

This is because the maximum rotation speed of the current flywheel is low.

Lubricating oil/stem (upper and lower bearings 3 by pump in Figure 1)
, 4 (adjacent to the upper and lower seals 6 and 7), there is no problem. Generally, the most effective way to increase stored energy is to increase the number of rotations. However, when the rotation speed is increased by 2, the oil is stirred and a lot of air is included in the oil.

In the same lubricant stem shown in Fig. 1, the vacuum capacity for maintaining the degree of vacuum in the casing 8 forming the flywheel chamber that houses the flywheel l becomes extremely large, reducing the efficiency of the entire system. 〇The purpose of the present invention is to focus on the above-mentioned points, and to create a con-secure lubricating oil system that is capable of sufficient deaeration.

An object of the present invention is to provide a power storage flywheel device that can maintain a necessary degree of vacuum inside a casing.

Its features include a flywheel chamber side oil outlet and an atmosphere side oil outlet that extract waste oil from the oil/ru portion of the flywheel shaft, and a degassed oil outlet from the atmosphere side oil outlet. It is equipped with a degassing device.

The present invention can be applied to power storage flywheel devices and high-speed rotating machines.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is an explanatory diagram showing a flywheel device according to one embodiment of the present invention.

In the figure, 20 is an atmospheric tank, 21 is a deaeration tank,
22 is a flow rate adjustment valve, 23 is an oil ssollet nozzle, 24
is a vacuum pump for deaeration, 27 is an oil tank, 25 is a pipe for initial exhaust of the oil tank + 26! d With the shutoff valve, there is a head difference between the atmospheric side oil drain outlet and the atmospheric tank 20, and a head difference Hv between the flywheel chamber side, that is, the vacuum side oil drain outlet and the oil tank 27.
, the head difference H between the lubricating oil ponzo 11 and the oil tank 27.

FIG. 3 shows an enlarged view of the upper seal 6. In the figure, 30 is a flywheel shaft, 31 is a nut, 32 is a seal sleeve, 33 is an oil gap, 34 is a knob holder, 35 is a seal retainer, 36 is a floating valve 7 (vacuum side), 37 bar 70 seal, sea (atmospheric side), 38 dowel pin, 39 spring, 40 lubricating oil supply hole,
41 is the atmosphere side seal gap, 42 is the vacuum side/le gap, 4
3 is an O-ring.

The same applies to the lower seal 7, but in FIG. 3, the lower side is the atmosphere side and the upper side is the vacuum side.

In terms of position, casing 8 is at the highest position.

Atmospheric tank 20. Below the oil tank 27, the lubricating oil pump 11 is at its lowest position. In FIG. 2, the deaeration tank 2 is located lower than the atmospheric tank 20. However, since the differential pressure is approximately I Kg/cl, it is also possible to provide the deaeration tank 21 at a higher position.

The operation in the case of the above configuration will be described.

Oil flows from the oil tank 27 to the lubricating oil bong 7'll,
Because of the head HP, the inlet of the oil pump 11 is prevented from becoming a leaky room. Oil enters the upper and lower seals 6.7 from the oil pump 11, and the exhaust oil on the atmospheric side enters the atmospheric tank 20 through a head difference HA into the degassing tank 21.
Then, deaeration is performed using the deaeration vacuum pump 24. Atmospheric tank 2
Since there is a pressure difference of about 1 atmosphere between the 0 and the deaeration tank 21, there is a flow rate adjustment valve 22 in the duct connecting the two, and an oil spray nozzle 23 is attached to the tip inside the deaeration tank 21. Completely degassed by spraying oil. The degassed oil enters the oil tank 27 and completes the circulation.

The vacuum side waste oil enters the oil tank 27 due to the difference in Hv and completes the circulation.

At the start of operation, the shutoff valve 26 is opened.

By starting the degassing vacuum pump 24.

Deaeration tank 21. The oil tank 27 is evacuated at the same time. During normal operation, the shutoff valve 26 is closed.

The oil flow in the knoll section is from the lubricating oil supply hole 40 to the atmosphere-side knoll gap 41. as shown by arrow A. It passes through the vacuum 1111 seal gap and becomes waste oil on the atmosphere side as indicated by arrow B and on the vacuum side as indicated by arrow C.

Let the pressure inside the casing 8 be p (Torr), and the amount of air contained in the oil at the /-le position be G (Torr-fΔ).

Exhaust capacity 5 (IVS
) becomes as follows.

S=G/p ・・・・・・・・・・・・・・・
・(1) In the system shown in Figure 2, the pressure in the deaeration tank is p, the exhaust capacity of the deaeration vacuum pump is S (4/s),
Let the amount of degassing be G (Torra#/s). In addition, the pressure inside the casing 8 is p (Torr) + the exhaust capacity of the vacuum pump 9 is 5c (A/s), and the deaeration amount is Gc (Torr).
r-1vS).

G2Ge1Gc=Se-pe+5c-pc ・
(2) Here, "e""S6'p6 r Gc = S, c'pc.

For simplicity, the displacement S and S of the vacuum pump are expressed as s'=s+
s ・・・・・・・・・・・・(3) Then, (
2) The formula is as follows.

G = S'(pe+pc)-8/, p8...
...(4) Here r p e > p c.

Although the pressure p 1 inside the cane puffer 8 is required to be extremely low in order to reduce windage damage, the pressure p 2 inside the degassing tank 21 can be set arbitrarily.

When p > p, equation (4) holds true. From the above, the exhaust capacity S of the vacuum pump in the system shown in Figure 1 is
and the total exhaust capacity 2 S' in the system shown in Figure 2.
The comparison is as follows.

Here, p<p.

Therefore, the required exhaust capacity in the system of FIG. 2 can be made extremely small, increasing the efficiency of the entire system.

In the case of the present invention as described above, the following effects can be achieved:
By providing a degassing tank with a pressure intermediate between atmospheric pressure and casing internal pressure, it is possible to effectively remove air and create a seal that maintains a high vacuum, improving the efficiency of high-speed rotating flywheel devices. .

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional power storage flywheel device, FIG. 2 is an explanatory diagram showing an embodiment of the flywheel device according to the present invention, and FIG. 3 is an enlarged view of the upper seal portion of FIG. 2. FIG. DESCRIPTION OF SYMBOLS 1... Flywheel, 2... Power generator/motor, 3° 4... Bearing, 6... Upper seal, 7... Lower sole, 8... Casing, 9... Vacuum pump, 20・
... Atmospheric tank, 21... Deaeration tank, 23... Nozzle for oil sosolet, 24... Vacuum pump for deaeration, 27
...Oil tank. 731 yen 1 Continued from page 1 ■ Applicant Tokyo Electric Power Company, Inc. 1-1-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo

Claims (1)

[Claims] 1 Equipped with a flywheel chamber-side drain oil outlet that extracts waste oil from the oil seal part of the flywheel shaft, an atmosphere-side drain oil outlet, and a degassing device that deaerates waste oil from the atmosphere-side drain oil outlet. A power storage flywheel device featuring: