JPS6154842A - Cooler of rotary electric machine - Google Patents

Abstract

PURPOSE:To economically control hydrogen gas pressure in a rotary electric machine by absorbing or discharging hydrogen to or from hydrogen storage alloy, and controlling hydrogen gas pressure in the machine in response to a load of a generator. CONSTITUTION:Gas flow control valves 22, 24 are opened in a normal load state, and high temperature and high pressure gas in a cooler inlet region 16 is flowed through a gas supply pipe 19 and a gas return pipe 21 into a tank 17. When the temperature rises to 60-65 deg.C, hydrogen is discharged from a hydrogen storage alloy 18 to cause the gas pressure in a machine to rise, and the gas pressure in the machine arrives at a rated target value. When a generator becomes a light load so that the hydrogen gas pressure can be decreased, the valve 22 is closed, the valves 22, 23 are then opened to flow the low temperature and high pressure gas in a discharging region 15 is flowed into the tank 17, the alloy 18 is cooled, the hydrogen is absorbed to the alloy to reduce the gas pressure in the machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a cooling device for a rotating electrical machine, and particularly to gas pressure control of hydrogen gas sealed as a cooling medium.

[Background of the invention]

Hydrogen gas is used to cool the inside of electric machines operating at high speeds, such as turbine generators, in order to reduce windage losses. Moreover, in order to further reduce windage damage,
A cooling gas pressure control method has been proposed in which the gas pressure is lowered during light loads with less calorific value and the M-shift is performed.

However, conventional IMs involve an increase in equipment and energy consumption for this gas pressure control, and the overall efficiency improvement has been small.

That is, in the conventional system shown in FIG. 3, hydrogen gas is supplied from a hydrogen cylinder 2 into the charger main body l via a gas supply pipe 3, and excess gas inside the machine is discharged into the atmosphere from a gas discharge pipe 4. It is something to be released. Gas flow control valves #5 and 6 installed in the middle of the pipes 3 and 4 control the gas pressure inside the machine, and the gas flow control valve 5 opens when the gas pressure inside the machine drops below the target value to release hydrogen. This is to replenish gas and maintain the gas pressure in the machine at the target value, and the gas flow control valve 6 opens when the target value of gas pressure is lowered under light load to release excess gas in the machine. This is to lower the gas pressure to the target value.

Furthermore, the conventional device shown in FIG. 4 is further equipped with a tank 8 connected to the charger main body (2) via a pipe 7, and excess gas is transferred to the tank 8 by means of a hump press and a gas flow control valve 10 placed in the middle of this pipe 7. Savings, this tank 8 when needed
This is to return the stored gas inside the aircraft.

The conventional equipment shown in Figure 3 consumes a large amount of hydrogen gas and is uneconomical, while the equipment shown in Figure 4 requires the addition of a tank 8 and a compressor 9, making the equipment complex and complicated. The power consumption of the compressor 9 is large and uneconomical.

[Purpose of the invention]

An object of the present invention is to provide a cooling device for a rotating electrical machine that can economically control the hydrogen gas pressure inside the machine.

[Existing requirements of the invention]

To achieve this objective, the present invention includes a fan that circulates hydrogen gas sealed as a cooling medium in a rotating electrical machine;
In the cooling system for the hydrogen gas Wi, which is equipped with a cooler for cooling hydrogen gas provided in the hydrogen gas circulation path, a tank containing a hydrogen storage alloy and a population of the tank are connected to the hydrogen gas circulation path. a gas supply passage connecting the high-temperature, high-pressure gas area and the low-temperature/high-pressure gas area, respectively; a gas circulation passage connecting the outlet of the tank to the low-pressure gas area I of the hydrogen gas circulation path; and these passages. When the load is reduced, low-temperature hydrogen gas is sent into the tank to cool the hydrogen storage alloy, which absorbs hydrogen and lowers the gas pressure inside the aircraft. By pumping gas into the tank and heating the hydrogen storage alloy, this hydrogen is released from the storage alloy, increasing the gas pressure inside the aircraft.

This economically realizes hydrogen gas pressure control according to load conditions.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIG.

Hydrogen gas sealed in the generator body l is energized by a fan 12 provided on the rotor 11 and moves inside the generator in the direction of the arrow II.
I ring. The hydrogen gas cooling cooler 13 is arranged in the second hydrogen gas circulation path, cools the armature winding and the field winding,
The heated hydrogen is cooled and returned to the back of the fan 12. As a result, in the hydrogen gas circulation path in one machine, the outlet region 14 of the cooler 13 is a low temperature/low pressure gas region, and the discharge region 5 of the fan 12 is a low-temperature, low-pressure gas region.
The high-pressure gas area, the 1-1 part area IG of Coo-7713, becomes a high-temperature/high-pressure gas area.

Tank 17 contains hydrogen storage alloy I8.

The water storage alloy 18 is generally made of lanthanum, rich rare earth, nickel, and aluminum alloy, which generates heat and absorbs hydrogen when cooled and/or pressurized; It has the property of absorbing heat and releasing hydrogen when pressurized.

The hydrogen storage alloy 18 is processed into a fiber, I':r, or porous material in order to increase the contact surface with the hydrogen gas in the tank. The inlet 17a of the tank 17 is connected via a gas supply pipe 19 to the cooler inlet region 6 where high-temperature, high-pressure gas of the hydrogen gas circulation path exists, and is connected via a gas supply pipe 20 to the cooler inlet region 6 where high-temperature, high-pressure gas exists.
It is connected to the discharge section hA15 where high pressure gas exists. Further, the outlet of the tank 17 is connected via a gas return pipe 2 to the cooler outlet area 14 where the low-ρ low-pressure gas is present. Gas flow control valves 22 to 24 are provided in the middle of these pipes 19 to 21.

The gas flow control valves 22 to 24 are controlled by detecting the load state of the generator by measuring the magnitude of the load current or field current of the generator or the gas temperature conduction in the cooler inlet area J or 16. Under normal load conditions, the gas flow control valve 22';
24 is opened and the gas flow:'j'l in valve 23 is closed, and in the light load state, the gas flow control valve 23°24 is opened and the gas flow control valve 22 is closed, so that the in-machine gas pressure is adjusted to the generator load state. Set the target value accordingly.

Note that hydrogen gas is charged into the machine from a hydrogen cylinder 2 via a gas supply pipe 3, as in the conventional apparatus.

In the above configuration, hydrogen gas is filled into the interior of the six machines by first evacuating the interior of the machine and the tank and then supplying hydrogen gas, or by filling the interior with carbon dioxide gas and then replacing it with hydrogen gas. This hydrogen gas filling is carried out at room temperature (40'C or higher).
-), the hydrogen storage alloy 18 in Tank F absorbs hydrogen. The hydrogen storage alloy 18 releases hydrogen in an amount such that the gas pressure inside the machine reaches the rated target value. Therefore, at this point, some of the hydrogen on board has been absorbed into the water-4 storage alloy 18, so the gas pressure is lower than the rated target value.

When the generator is operated, the temperature of the hydrogen gas circulating inside the machine rises rapidly. Under normal load conditions, the gas flow control valve 22.24
is open, the high-temperature, high-pressure gas in the cooler inlet region [6 flows through the gas supply pipe '19 and the gas return pipe 21 to the tank 17. Then, when the temperature reaches 60° C. to 65° C., hydrogen is released from the hydrogen storage alloy 18, and the in-machine gas pressure increases, and the in-machine gas pressure reaches the rated target value.

When the generator is under light load and the hydrogen gas pressure can be reduced, the gas flow control valve 22 is closed and the gas flow control valves 23,24 are activated to reduce the f ! , by flowing hot and high-pressure gas into the tank 17, the hydrogen storage alloy 18 is cooled and hydrogen is absorbed into the hydrogen storage alloy 18.
By lowering the gas pressure inside the aircraft, windage loss can be reduced by 1! perish.

Furthermore, if the program is to control the generator so that it is operated at a high load for five days and at a light load during the night, the gas pressure inside the machine can be controlled by the progera 11 accordingly.

Further, in the case of a sudden increase in load, if the hydrogen gas pressure cannot be increased by releasing hydrogen from the hydrogen meter alloy 18 alone, replenishment can be made from the hydrogen cylinder 2.

FIG. 2 shows an example in which the above embodiment is modified to improve the responsiveness of the hydrogen storage alloy 18. The heating device 25 is provided in the middle of the gas supply pipe 19 and directly heats the hydrogen gas supplied to the tank 17 to further raise the temperature. The cooling device 26 is provided in the middle of the gas supply pipe 20 and directly cools the hydrogen gas supplied to the tayunok 17 to further lower the temperature. In addition, the device 27
is for directly cooling or heating the tank 17.

The addition of each of these devices includes absorption of the hydrogen storage alloy 18,
It has the effect of increasing the release action and improving responsiveness. However, it is possible to save energy by using these heat sources (cooling, heating) that are conventionally attached to generators. [Effects of the Invention] As described above, the present invention provides hydrogen storage alloys using.

More times! Iti4? Heat generation of TI machine, cooling by cooler,
Hydrogen I? using the hydrogen gas circulation flow by the cooling fan.
Since the hydrogen contained in the metal alloy is absorbed or released and the hydrogen gas pressure inside the machine is controlled according to the load of the generator, there is an effect that the gas pressure can be controlled economically.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a generator cooling device according to the present invention. Figure 2 is a system diagram showing a modified example, and Figures 3 and 4 are conventional generator cooling systems! This is a system diagram of Hospital A. 1...Filming machine body, 12...Fan, 13...Cooler, )4...
Low-temperature/low-pressure gas outlet head, 15... Low-temperature/high-pressure gas discharge area, 16... High-temperature/high-pressure gas inlet area, 17... Tank , 1
8...Hydrogen storage alloy, 19.20...
Gas supply pipe, 21...Gas return pipe. 22-24... Gas flow control valve. Figure 1 Second doctor

Claims (1)

[Claims] 1. In a cooling device for a rotating electrical machine that includes a fan that circulates hydrogen gas sealed as a cooling medium within the rotating electrical machine and a hydrogen gas cooling cooler provided in the hydrogen gas circulation path, a hydrogen storage alloy is used. A built-in tank, a gas supply passage connecting the inlet of the tank to the high temperature/high pressure gas region and the low temperature/high pressure gas region of the hydrogen gas circulation path, and the outlet of the tank to the low pressure gas region of the hydrogen gas circulation path. 1. A cooling device for a rotating electric machine, comprising: a gas return passageway connected to a gas return passage; and a control valve disposed in these passageways.