JPS61227651A - Hydrogen pressure regulator of hydrogen-cooled rotary electric machine - Google Patents

Abstract

PURPOSE:To eliminate operations for filling and discharging hydrogen gas by automatically regulating the hydrogen gas pressure in a machine of cooling medium in response to a variation in a load. CONSTITUTION:A plurality of racks 18 are formed in a hydrogen gas circulating path in a hydrogen-cooled rotary electric machine, cases 17 for containing powder hydrogen storage alloy 19 filled in a housing are held on the racks 18. Hydrogen gas 15 circulated in the machine is freely passed through the cases 17 to rise or fall the temperature of the alloy 19, thereby automatically regulating the hydrogen pressure in the machine in response to the magnitude of a load. Thus, the efficiency of the rotary electric machine can be improved. Since the case 17 containing the alloy 19 is provided in the hydrogen gas circulating passage in the machine, the absorbing and discharging phenomenon of the hydrogen of the alloy 19 for the temperature change of the gas in the machine can be effectively utilized.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a hydrogen-cooled rotating electric machine, in particular a hydrogen storage alloy installed in a hydrogen gas circulation system so that the hydrogen gas pressure inside the machine can be adjusted according to load fluctuations. This invention relates to a hydrogen pressure adjustment device for a cooling rotary electric machine.

[Technical background of the invention and its problems]

Some rotating electric machines, such as turbine generators, use hydrogen gas as a cooling medium.

In this case, it is necessary to increase the heat capacity of the hydrogen gas in the aircraft as the capacity of the turbine generator increases, i.e., (specific weight) x (specific heat) to improve the cooling effect. Some have a gas pressure of, for example, 5.2 at-.

However, in recent years, turbine generators have been used more frequently, and are sometimes used not only at 100% load but also at partial load. During this partial load, the electrical loss of the generator is small, and there is no need to keep the hydrogen gas pressure at 5.2 atl for cooling purposes. If the hydrogen gas pressure inside the machine is kept at 5.2 atlB during partial load, the windage loss of the rotor and the fan power will decrease by 100%.
% load, so the efficiency of the generator decreases.

Therefore, in such a case, by lowering the hydrogen gas pressure inside the machine, the windage loss of the rotor and the fan power can be reduced, and the efficiency of the generator can be improved.

By the way, in conventional hydrogen-cooled rotating electric machines, the hydrogen gas inside the machine is injected using a high-pressure hydrogen gas cylinder. Therefore, in order to adjust the hydrogen gas pressure inside the machine according to load fluctuations, it is necessary to release hydrogen gas from inside the machine. The hydrogen gas was then re-injected from a high-pressure hydrogen gas cylinder. However, this method has the disadvantage that the operations for injecting and discharging hydrogen gas are complicated and that a large amount of hydrogen gas is consumed.

(Object of the Invention) The present invention was made to eliminate the above-mentioned drawbacks, and its purpose is to eliminate the need for operations for injecting and releasing hydrogen gas, and to save energy by eliminating the consumption of hydrogen gas. An object of the present invention is to provide a hydrogen pressure regulating device for a hydrogen-cooled rotating electric machine that can effectively utilize hydrogen.

[Summary of the invention]

In order to achieve such an object, the present invention is an electric rotating machine that uses hydrogen gas as a cooling medium and releases heat inside the machine via a cooler. It is equipped with a powdered hydrogen storage alloy that releases gas or adsorbs hydrogen gas inside the machine, so that the hydrogen gas pressure inside the machine can be automatically adjusted in response to load fluctuations.

Here, a hydrogen storage alloy is a combination of metal atoms such as titanium and Mitsushi metal, which have the property of absorbing hydrogen very well.When the temperature is lowered or the pressure is increased, the hydrogen storage alloy absorbs hydrogen gas and generates heat. When the temperature is raised or the pressure is lowered, the absorbed hydrogen gas is released and heat is taken away from the surroundings.Also, the concentration of the alloy itself changes depending on the pressure of the hydrogen gas being sent, and conversely the temperature of the alloy itself changes. There is a correlation in that the pressure of the hydrogen gas generated will also differ depending on the change.

[Embodiments of the invention]

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

First, the outline of this embodiment will be explained with reference to FIGS. 1 and 2. In FIG. 1, reference numeral 1 denotes a rotary N machine, into which hydrogen gas is injected as a cooling medium. 2 is heat generated inside the rotating electrical machine as heat such as iron loss, Jl loss, and copper loss, which are simulated as heaters. 3 is heater 2
This is a simulated representation of a cooler that cools down the heat.

In addition, 5 is a case connected to the cooling gas system inside the aircraft via piping 4. This case 5 is filled with a powdered hydrogen storage alloy, so that hydrogen gas flows between it and the inside of the aircraft. .

Next, the operation of the hydrogen pressure regulating device for the hydrogen-cooled rotating electric machine constructed as described above will be described with reference to FIG. FIG. 2 shows an example of the characteristics of the powdered hydrogen storage alloy filled in the case 5. In other words, the load on the rotating electric machine is 10
When it is 0%, the temperature of hydrogen gas, which is a cooling medium, is 50°
C, the gas pressure inside the machine is in equilibrium at 5.2 atm. When the load decreases from this state and the heat generated by the heater 2 decreases, the cooler 3 cools the hydrogen gas that is the cooling medium. If the temperature of the hydrogen gas reaches 40°C, the hydrogen gas will be adsorbed by the hydrogen storage alloy, and the pressure inside the aircraft will rise to 40°C. The pressure is reduced to Qat■. Strictly speaking, reducing the cabin pressure reduces the cooling capacity of hydrogen gas, suppressing the drop in gas temperature, and reducing the hydrogen gas concentration due to wind damage and reduced fan power. Ru. Since the windage loss of the rotor of the rotating electric machine and the fan power are reduced in this way, the efficiency of the rotating electric machine can be improved.

Conversely, when the load increases and the temperature of hydrogen gas, which is a cooling medium, rises, hydrogen gas is released from the hydrogen storage alloy, so the internal pressure increases and the cooling effect can be increased.

In this way, the hydrogen gas pressure inside the machine can be automatically adjusted by simply adsorbing hydrogen gas in the machine or releasing hydrogen gas into the machine in response to changes in the load of the rotating electric machine by using the characteristics of the hydrogen storage alloy. There is no need for any mechanical mechanism, resulting in high reliability, and there is no need to release hydrogen gas into the atmosphere to adjust the hydrogen gas pressure inside the aircraft.

Next, the specific configuration of this embodiment will be explained with reference to FIG.

As shown in FIG. 3, the case 5 is constructed such that an upper header 5a is provided at approximately the center of the circumferential surface of the cylinder, and inside the case 5, a plurality of heat transfer tubes 6 are arranged along the longitudinal direction of the cylinder. The space outside the heat transfer tubes 6 formed between the heat transfer tubes 6 is filled with the above-mentioned powdered hydrogen storage alloy 7.

The openings at both ends of the case 5 are connected to pipes 4a and 4b which are arranged to communicate with the inside of the rotating electric machine 1, so that part of the gas in the hydrogen gas circulation system inside the machine flows through each heat transfer tube 6. It's Nishide. Also, the upper header 5a of the case 5
is provided with a filter 8 having air permeability, and is connected to a pipe 4C that communicates with the interior of the machine, through which hydrogen is released from the hydrogen storage alloy 7 or adsorbed by the hydrogen storage alloy 7. This allows gas to flow to and from the cabin.

In addition, 9a, 9b, and 9c are valves installed in the middle of each pipe 4a, 4b, and 4C that connect the case 5 and the inside of the rotating electrical machine 1, and these valves are used to remove the hydrogen inside the machine when the case 5 is removed from the rotating electrical machine 1 side. This is to prevent gas from being released into the atmosphere.

Next, the operation of the hydrogen pressure 11M device for the hydrogen-cooled rotating electric machine constructed as described above will be described. Now, the pipe 4a connecting the case 5 and the inside of the rotating electric machine 1 is connected to the discharge gas system of the hydrogen gas circulation fan inside the machine, and the pipe 4b
is connected to the suction gas system, hydrogen gas flows between the inside of the machine and the case 5 as shown by the arrow.

In this case, the hydrogen gas that has flowed into the case 5 from the pipe 4a flows through each heat transfer tube 6, warms or cools the hydrogen storage alloy 7 filled in the space outside the tube, and then flows into the case 5.
It will flow out from the pipe 4b. Furthermore, when the hydrogen storage alloy 7 is warmed by the hydrogen gas flowing through the heat transfer tube 6, the hydrogen gas released from the hydrogen storage alloy 7 is introduced into the machine from the upper header 5a through the filter 8 and the piping 4C; When the storage alloy 7 is cooled, it is passed from the inside of the machine through the pipe 4C and the filter 8 to the upper header 5a.
Hydrogen gas introduced into the hydrogen storage alloy 7 is adsorbed by the hydrogen storage alloy 7.

Therefore, when the temperature of hydrogen gas inside the machine increases or decreases as shown in Figures 1 and 2 due to an increase or decrease in the load on the rotating electric machine, hydrogen gas flows from the hydrogen storage alloy 7 into the machine. Since the hydrogen gas inside the machine is adsorbed by the hydrogen storage alloy 7, the hydrogen gas pressure inside the machine is automatically adjusted according to load fluctuations.

As described above, in this embodiment, a plurality of heat transfer tubes 6 are provided inside the case 5, and the space outside the tubes is filled with hydrogen storage alloy 7, so that the hydrogen gas inside the machine is circulated through each heat transfer tube 6. , heat exchange with the hydrogen storage alloy 7 becomes good. In addition, a filter 8 is attached to the upper header 5a of the case 5.
is provided, so even if hydrogen gas released from the hydrogen storage alloy 7 flows into the interior of the machine from the upper header 5a, there is no fear that the powdered hydrogen storage alloy will scatter and enter the interior of the machine. Further, since valves 98 to 9C are provided in each of the pipes 4a to 4C connecting the case 5 and the interior of the rotary type g11, when the hydrogen storage alloy 7 reaches the end of its life, the valves 9a to 9
By sealing in the hydrogen gas inside the machine, the case 5 can be removed and replaced with a new one without stopping the operation of the rotating electric machine.

In the above embodiment, the upper header 5a of the case 5 is rotated N.
Although the pipe 4C is connected directly to the inside of the machine 1, the pipe 4C may be connected to the pipe 4b side that introduces the hydrogen gas flowing out from the case 5 into the machine, as shown in FIG. It may be connected to the piping 4a side that introduces hydrogen gas from inside the machine into the case 5. Further, in the above embodiment, each pipe 48 to 4C is provided with one valve 9a to 9C, but as shown in FIG.
~4C with two valves 9a~9C each.

10a-10. c may be provided to seal in the hydrogen gas inside the machine and the case when the case 5 is removed. Further, in the above embodiment, a configuration is shown in which one case 5 filled with hydrogen storage alloy 7 is connected to the rotating electrical machine 1, but the sixth embodiment
As shown in the figure, two cases 5 may be provided and connected to the rotary mold 111 in parallel by piping through valves, so that one of them can be used as a spare.

In this example, the effect was described with a configuration in which the hydrogen storage alloy is filled outside the tube, but the same effect can be obtained even if the hydrogen storage alloy is filled inside the tube and the in-machine circulating hydrogen gas passes through the outside of the tube. Needless to say, it is effective.

Next, another embodiment of the present invention will be described with reference to FIGS. 7 and 8.

FIG. 7 shows an example of a configuration in which a case containing a hydrogen storage alloy is provided as part of an in-machine hydrogen gas circulation system of a hydrogen-cooled rotating electric machine. In FIG. 7, reference numeral 11 denotes a stator frame of a rotating electric machine, and a stator core 12 is attached to the inner peripheral surface of the stator frame 11, and a gas ventilation path is formed on the back surface of the stator frame. 13 is a rotor supported by a bearing (not shown), and a self-fan 14 is attached to this rotor 13.
This is for forced circulation of hydrogen gas 15 sealed inside the machine at a pressure higher than atmospheric pressure. Reference numeral 16 denotes a cooler installed at an appropriate location in the hydrogen gas circulation path formed inside the machine. This is for cooling and lowering the temperature.

In the hydrogen-cooled rotating electric machine having such a configuration, in this embodiment, the hydrogen gas circulation path inside the machine is located at an appropriate position.

In the figure, a case 17 containing a powdered hydrogen storage alloy is attached to the upstream side of a cooler 16 provided near both ends of the stator frame 11 in the axial direction. This case 17
As shown in FIG. 8, the case 17 is formed into a cylindrical shape through which hydrogen gas flows through openings at both ends, and a plurality of shelves 18 are formed inside the case 17. On each of these shelves 18, a powdered hydrogen storage alloy 19 filled in a highly thermally conductive housing with air permeability that also serves as a filter is provided.

In the hydrogen pressure regulating device for the hydrogen-cooled rotating electric machine configured as described above, the hydrogen gas 15 in the current is transferred to the self-fan 14.
Assuming that the hydrogen gas is circulating through the gas circulation path as indicated by the arrow in the figure, the hydrogen storage alloy 19 has approximately the same temperature as the hydrogen gas passing through the case 17. In such a state, if the load on the rotating electric machine decreases, the amount of heat generated inside the machine decreases, and the temperature of the hydrogen gas also decreases accordingly. At this time, the hydrogen storage alloy 19 is cooled by the circulating hydrogen gas 15, and the temperature of the alloy itself decreases. Therefore, the hydrogen gas 15 inside the machine is adsorbed by the hydrogen storage alloy 19, so the total amount of hydrogen gas circulating inside the machine decreases.
Hydrogen gas pressure inside the aircraft decreases.

Further, when the load on the rotating electric machine increases, the temperature of the hydrogen gas 15 inside the machine increases, so the temperature of the hydrogen storage alloy 19 also increases, and the hydrogen gas that has been adsorbed thus far starts to be released. Therefore, the pressure of hydrogen gas inside the aircraft increases.

As described above, in this embodiment, a plurality of shelves 18 are formed in the hydrogen gas circulation path inside the hydrogen-cooled rotating electric machine, and the shelves 18 are
Powdered hydrogen storage alloy 19 filled in the housing on top of 8
The hydrogen gas 15 circulating inside the machine is freely passed through the case 17 to raise or lower the temperature of the hydrogen storage alloy 19, thereby controlling the hydrogen pressure inside the machine. Since it can be automatically adjusted according to the size of the load, the efficiency of the rotating electric machine can be improved. Furthermore, in this embodiment, the case 17 containing the hydrogen storage alloy 19 is installed in the hydrogen gas circulation path inside the aircraft, so that the phenomenon of adsorption and release of hydrogen gas by the hydrogen storage alloy 19 due to temperature changes in the hydrogen gas inside the aircraft can be prevented. Can be used effectively.

In the above embodiment, the hydrogen storage alloy 19 filled in the casing was directly provided on the multiple stages 1118 formed in the casing 17, but this was installed on each shelf as shown in FIG. A heater 20 is installed on the rotating electrical machine 18, and when the load on the rotating electric machine increases, the heater 20 electrically heats the hydrogen storage alloy 19 in advance to increase the pressure of hydrogen gas inside the machine. Inu Samurai is able to suppress the temporary temperature rise of the rotating electric machine to a low level. In addition, in the above embodiment, the case 17 is installed horizontally along the flow direction of hydrogen gas, but if the case 17 is installed vertically, the shelves should be installed so that the hydrogen gas flows in a zigzag pattern. It is also possible to have an array configuration in which the positions are shifted every other row or every multiple rows.

Although the embodiments of the present invention have been described using a powdered hydrogen storage alloy, it goes without saying that the same effect can be obtained even if a porous hydrogen storage alloy with air permeability is used.

〔Effect of the invention〕

As described above, according to the present invention, in a rotating electric machine that uses hydrogen gas as a cooling medium and releases heat inside the machine via a cooler, temperature changes may occur in a part of the hydrogen gas circulation system in which hydrogen gas inside the machine circulates. By installing a hydrogen storage alloy that releases hydrogen gas or adsorbs hydrogen gas inside the aircraft, we have made it possible to automatically adjust the hydrogen gas pressure inside the aircraft in response to load fluctuations, so it is no longer necessary to inject or release hydrogen gas as before. It is possible to provide a hydrogen pressure regulating device for a hydrogen-cooled rotating electrical machine that does not require any additional operations and can also eliminate consumption of hydrogen gas and effectively utilize energy.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of an embodiment of a hydrogen pressure regulating device for a hydrogen-cooled rotating electric machine according to the present invention, Fig. 2 is a characteristic diagram of a hydrogen storage alloy used in the embodiment, and Fig. 3 is a diagram of the hydrogen storage alloy used in the embodiment. Specific configuration explanatory diagrams, FIGS. 4 to 6 are configuration explanatory diagrams showing modified examples of FIG. 3, FIG. 7 is a configuration explanatory diagram showing another embodiment of the present invention, and FIG. 8 is the same. FIG. 9 is a structural explanatory diagram of a case for housing the hydrogen storage alloy in the embodiment, and FIG. 9 is a structural explanatory diagram showing a modification of FIG. 8. 1...Rotating electric machine, 2...Heater simulated 3...Tara simulated, 4,4
a to 4c... Piping, 5... Case housing hydrogen storage alloy, 6... Heat exchanger tube, 7...
...Hydrogen storage alloy, 8...Filter, 9a
~9C, 108~10c...Valve, 11...
... Stator frame, 12 ... Stator core, 13 ... Rotor, 14 ... Self-fan, 15 ... Hydrogen gas, 16 ...Cooler, 17...Case, 18...Shelf, 1
9... Hydrogen storage alloy, 20... Heater. Applicant's agent Patent attorney Takehiko Suzue No. 111 $3!11 14@1 116 Figure

Claims (7)

[Claims] (1) In a rotating electric machine that uses hydrogen gas as a cooling medium and releases heat inside the machine via a cooler, a part of the hydrogen gas circulation system in which hydrogen gas circulates inside the machine may release hydrogen gas into the machine or 1. A hydrogen pressure adjustment device for a hydrogen-cooled rotating electric machine, characterized in that a hydrogen storage alloy that adsorbs hydrogen gas is provided to adjust in-machine hydrogen gas pressure in accordance with load fluctuations. (2) The hydrogen pressure regulating device for a hydrogen-cooled rotating electric machine according to claim 1, wherein the hydrogen storage alloy is provided in a hydrogen gas circulation system outside the machine that communicates with a hydrogen gas circulation system inside the machine. (3) Hydrogen gas released from the hydrogen storage alloy to the hydrogen gas circulation system inside the aircraft is filtered through a filter that has air permeability in a part of the circulation path between the hydrogen gas circulation system inside the aircraft and the hydrogen gas circulation system outside the aircraft. A hydrogen pressure regulating device for a hydrogen-cooled rotating electric machine according to claim 2, which is provided with a hydrogen pressure regulating device. (4) Claims 2 or 3, wherein a plurality of valves are provided upstream and downstream of the hydrogen gas circulation system outside the machine so as to be partitionable, which communicates with the hydrogen gas circulation system inside the machine. A hydrogen pressure adjustment device for a hydrogen-cooled rotating electric machine as described in 2. (5) The hydrogen storage alloy is held on a plurality of shelves formed in a case provided to allow hydrogen gas to flow through the hydrogen gas circulation system in the aircraft.Claim 1
A hydrogen pressure adjustment device for a hydrogen-cooled rotating electric machine as described in 2. (6) The hydrogen pressure regulating device for a hydrogen-cooled rotating electric machine according to claim 5, further comprising an electric heater that heats a hydrogen storage alloy built into a housing installed in the case. (7) The casing installed on a shelf in a case provided in the in-flight hydrogen gas circulation system and containing the hydrogen storage alloy has air permeability that also serves as a filter and has high thermal conductivity. A hydrogen pressure adjustment device for a hydrogen-cooled rotating electric machine according to item 5 or 6.