JPS61293132A - Adjusting method for hydrogen pressure for hydrogen-cooled rotary electric machine - Google Patents

Abstract

PURPOSE:To enable a load to cope with sudden fluctuation, by setting the hydrogen balanced pressure of hydrogen storage alloy contained in a case connected to the outer section of a hydrogen-gas-cooled rotary electric machine, to be the highest limit or more/ the lowest limit or less of regulated pressure in the machine. CONSTITUTION:The headers 8a, 8b at the both ends of stator coils 2 formed with hollow conductors are connected to out-of-machine pipings 10a, 10b to organize water- cooled system consisting of a tank 11, a pump 12, and a cooler 13. The tank 11 is by-passed with valves 22a, 22b and pipings 21, and current is returned to the tank 11 via the valve 22a, a case 14, and a pipe 18b. Hydrogen storage alloy 17 is contained in the case 14 and is heated/cooled with circulation water, and is set, for example, at the temperature of 60-80 deg.C and the hydrogen pressure of 5.2kg/cm<2>, or at the temperature of 40-45 deg.C and the hydrogen pressure of 1.0kg/cm<2>. In accordance with the fluctuation of a load, a valve 22c is opened or closed to communicate with or intercept a space section 4 in the machine. As a result, the device can cope with the sudden increment of the load, and the windage loss of a self-fan on a low load is reduced, and operation efficiency can be improved.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a hydrogen-cooled rotating electric machine, and particularly to a hydrogen-cooled rotating electric machine that uses a hydrogen storage alloy to adjust the hydrogen gas pressure inside the machine according to load fluctuations. Related to pressure adjustment method.

[Technical background of the invention and its problems]

Some rotary 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 increase the cooling effect. Especially in large capacity aircraft, the hydrogen gas in the aircraft Some have a pressure of 5.2 atm, for example.

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 atm for cooling purposes. If the hydrogen gas pressure inside the machine is left at 5.2 atm during partial load, the windage loss of the rotor and the fan power will be reduced to 100%.
Since it is the same as when under load, 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 at partial load can be improved. Also,
If the hydrogen pressure is kept constant regardless of the load, supercooling will occur at partial load, and a heat cycle depending on the load will be applied to the components of the rotating electrical machine, such as insulators. Changing the pressure keeps the temperature of the rotating electrical machine constant, which has the advantage of extending the life of the rotating electrical machine.

Therefore, in the past, the hydrogen gas pressure inside the rotating electric machine was adjusted by releasing the hydrogen gas inside the machine to the atmosphere or reinjecting it from a high-pressure hydrogen gas cylinder depending on load fluctuations. However, this method requires complicated operations for injecting and discharging hydrogen gas, requires sufficient safety measures when handling hydrogen gas, and consumes a large amount of hydrogen gas. There are also problems from the perspective of effective energy use.

In addition, as a solution to this problem, for example, as in the invention described in Japanese Utility Model Application Publication No. 12720/1983, the hydrogen gas pressure inside the turbine generator can be adjusted by a pressure adjustment control mechanism according to load fluctuations. There is something like this.

FIG. 10 shows a hydrogen gas pressure adjustment system in such a conventional hydrogen-cooled turbine generator. That is, as shown in FIG. 10, in a turbine generator 31 connected to an external load system, hydrogen gas filled in a hydrogen gas cylinder 33 can be supplied to the interior 32 of the turbine generator 31 via a pressure regulating valve 34. Also, as a control system for adjusting the hydrogen gas pressure inside the machine, there is a relief hydrogen reserve chamber 36 that communicates with the inside of the machine via a pressure regulating valve 35, and a piston 37 that adjusts the volume of this reserve chamber 36 and allows hydrogen gas in and out of the machine interior 32 to flow in and out. The size of the load is detected by the output of the piston drive mechanism 38 that drives the piston 37 and the turbine power generator 131, and a drive command is given to the piston drive mechanism 38 according to the load fluctuation, and the pressure regulating valve 35 is opened/closed. It is composed of a load following control mechanism 39 that gives commands.

Therefore, in the hydrogen gas pressure adjustment system of a turbine generator with such a configuration, the pressure in the hydrogen gas cylinder 33 is normally controlled to be constant by reducing the pressure by the pressure adjustment valve 34, and when there is a load change, the pressure in the hydrogen gas cylinder 33 is controlled to be constant. Follow-up control mechanism 3
Based on the command from 9, the piston 37 is driven to adjust the volume of the reserve chamber 36, and the opening of the pressure regulating valve 35 is controlled to adjust the in-machine hydrogen gas pressure of the turbine generator 32 according to load fluctuations. be able to.

However, in the hydrogen gas pressure adjustment system of such a turbine generator, the volume of the reserve chamber 36 is adjusted by a piston 37 that slides on the circumferential surface of the reserve chamber. If the seal is not adequate, there is a risk that hydrogen gas, which is under high pressure on the side communicating with the inside of the machine, may leak to the back of the piston, which is in atmospheric conditions, leading to an explosion.

Therefore, recently, a method has been developed that allows the hydrogen gas pressure inside the aircraft to be easily adjusted without using the relief hydrogen reserve chamber described above or a driving device such as a piston that adjusts the volume of this reserve chamber, and without the consumption of hydrogen gas. The use of hydrogen storage alloys is being considered.

This hydrogen storage alloy is made by combining metal atoms such as titanium and Mitsushi metal, which have the property of absorbing hydrogen very well, and when the temperature is lowered or the pressure is increased, it absorbs hydrogen gas and generates heat, and vice versa. When the pressure is raised or lowered, the absorbed hydrogen gas is released and heat is taken away from the surroundings.Also, the temperature of the alloy itself changes depending on the pressure value of the hydrogen gas being sent; conversely, by changing the temperature of the alloy itself, There is a correlation in that the pressure of the generated hydrogen gas is also different.

FIG. 7 shows an example of the characteristics of a hydrogen storage alloy. In other words, as shown in Figure 7, the characteristics of the hydrogen storage alloy are upward-sloping characteristics with an almost flat part in the center. The solid solution stage, the flat part in the center is the stage where metal hydrides are formed by a hydrogenation reaction, and the upward-sloping part on the right side of the characteristics is the solid solution stage where all the metals are hydrogenated and hydrogen enters the interstitial spaces to become supersaturated.

Of these, the most hydrogen is absorbed during the hydrogen compound formation stage, and because the reaction proceeds at a nearly constant pressure, this part is called the equilibrium zone, and the pressure at this stage is called the equilibrium pressure. This equilibrium pressure varies depending on the temperature of the hydrogen storage alloy and also varies depending on the type of hydrogen storage alloy. An example of the relationship between equilibrium pressure and temperature is shown in FIG. 8.

When a hydrogen storage alloy having such characteristics is placed in a closed container and heated and cooled, the hydrogen gas pressure in the container changes as shown in the following equation.

Let the volume of the container be V (m3) and the initial pressure inside the container PO (K
fl/c#, hydrogen storage capacity k(m3/
When sufficient cooling and heating are performed to absorb and release hydrogen gas, the pressure inside the container is P = Pa ± KM/V, where + indicates release and - indicates absorption. show.

By utilizing the above-mentioned characteristics of the hydrogen storage alloy, it is possible to adjust the hydrogen pressure within the rotating electric machine by making it stationary, but in this case, it is necessary to heat and cool the hydrogen storage alloy. In heating and cooling this hydrogen storage alloy, it would be advantageous in terms of energy if possible to utilize the exhaust heat of the cooling medium used in the rotating electric machine.

Therefore, when the load on the rotating electric machine is large, the internal pressure is increased by heating the hydrogen storage alloy and releasing hydrogen gas, and when the load is reduced, the hydrogen storage alloy is cooled and hydrogen gas is adsorbed. It is sufficient to reduce the pressure inside the machine, but in that case, it is conceivable to use stator winding cooling water, which is a cooling medium for the rotating electric machine whose temperature changes according to changes in load.

On the other hand, there is a permissible pressure in the relationship between the load of a rotating electric machine and hydrogen gas pressure, and the electrical loss when the load decreases and the temperature rise of the rotating electric machine parts due to cooling of the reduced pressure hydrogen gas at 100% load. The allowable hydrogen gas pressure is determined based on the condition that it is the same as the humidity increase.

Therefore, when heating and cooling a hydrogen storage alloy using the exhaust heat of the cooling medium of a rotating electric machine, the hydrogen storage alloy's hydrogen balance is determined by the allowable hydrogen pressure for the load of the rotating electric machine and the exhaust heat temperature of the cooling medium generated by the load. If the pressures are equal, if the hydrogen storage alloy is heated and cooled using the exhaust heat, it is possible to completely automatically adjust the hydrogen gas pressure according to the load of the rotating electric machine.

However, for example, when exhaust heat of stator winding cooling water is used, the characteristics of the hydrogen storage alloy (a) as shown in Figure 9.
, (b), (c), and (d) do not match the relationship between the exhaust heat temperature and the allowable hydrogen gas pressure (A>) for the load. Also, hydrogen storage alloys are generally in powder form and there is a gap between the particles. Due to the presence of hydrogen gas, heat conduction is poor compared to solid metals, and there is a time lag between cooling or heating until the hydrogen equilibrium pressure of the hydrogen storage alloy is reached, especially when the load increases rapidly.
A delay in the rise of hydrogen gas pressure leads to heating of the components of the rotating electrical machine, so time lags must be avoided.

In this way, when hydrogen storage alloys are used to adjust hydrogen gas and pressure in rotating electric machines, problems arise such as inconsistency in the characteristics of the hydrogen storage alloys and time lag.

[Object of the Invention] The present invention was made to solve these problems, and it facilitates the selection of a hydrogen storage alloy and reduces the time lag between cooling or heating until the hydrogen storage alloy reaches hydrogen equilibrium pressure. An object of the present invention is to provide a hydrogen pressure adjustment method for a hydrogen-cooled rotating electrical machine, which can quickly adjust the pressure of hydrogen gas inside the machine even if the load changes rapidly.

[Summary of the invention]

In order to achieve such an object, the present invention provides a case housing a hydrogen storage alloy that releases or adsorbs hydrogen gas in response to temperature changes outside a rotating electrical machine that is cooled by hydrogen gas. A pipe for introducing hydrogen into the machine is connected to communicate with the inside of the machine, and a pipe for flowing hydrogen gas into and out of the hydrogen gas circulation system inside the machine is connected, and a valve is provided in the middle of each pipe, and a valve is provided in the middle of each pipe. When adjusting the in-machine hydrogen gas pressure according to load fluctuations by cooling or heating the hydrogen storage alloy by flowing a cold medium of the rotating electrical machine into and out of the flow path, the cooling medium of the rotating electrical machine is used as the hydrogen storage alloy. Select a hydrogen storage alloy whose hydrogen equilibrium pressure is above the maximum regulated pressure inside the machine at the discharge temperature, and whose hydrogen equilibrium pressure is below the minimum regulated pressure inside the machine at the supply temperature of the cooling medium of the rotating electric machine. The gas pressure in the case is kept above the maximum adjustment pressure limit or below the minimum adjustment pressure limit, and the valve is opened and closed according to load fluctuations to release hydrogen gas into the aircraft or to adsorb hydrogen gas inside the aircraft. It is characterized by adjusting the hydrogen gas pressure.

[Embodiments of the invention]

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

Figure 1 shows the hydrogen cooling rotation NI! according to the present invention! This figure shows an example of the structure of the hydrogen pressure regulating device of I. In Figure 1,
Reference numeral 1 denotes a stator frame of a rotating electrical machine, for example, a turbine generator.A stator core 3 having a stator winding 2 made of a hollow conductor through which cooling water can flow in and out is attached to the inner peripheral surface of the stator frame, and a stator core 3 is attached to the back of the stator frame. A gas ventilation space 4 is formed therein.

Reference numeral 5 denotes a rotor supported by a bearing, and a self-supporting fan 6 is attached to the rotor 5 to forcefully circulate hydrogen gas 7 sealed inside the machine at a pressure higher than atmospheric pressure. Further, 8a and 8b are headers for passing cooling water through the hollow conductor of the stator winding 2, and these headers 8a,
A pure water supply device 9 provided outside the machine is connected to the pipe 10a in 8b.
, 10b. This pure water supply device 9
Tank 11° Pump 12. It is composed of a cooler 13 and an ion exchange resin (not shown). On the other hand, 14 is a case provided outside the machine, and this case 14 has an upper header 15 at approximately the center of the circumferential surface of the cylinder, and a plurality of heat exchanger tubes 16 are arranged inside the cylinder in the longitudinal direction of the cylinder. A powdered hydrogen storage alloy 17 is filled in the extra-tube space formed between the heat transfer tubes 16 along the heat exchanger tubes 16 .

In such a case 14, a stator is connected to one opening of the cylindrical body, and a pipe 10a connecting the cooling water outlet header 8a of the winding 2 and the tank 11 of the pure water supply device 9 is connected to the middle of the stator. At the same time as connecting the pipe 18a
A and a pipe 1'Ob near the outlet of the cooler 13 are connected by a pipe 21, and a pipe 18b for returning the cooling water to the tank 11 of the pure water supply device 9 is connected to the other opening of the cylinder. A bypass path is formed to bypass a portion of the cooling water.

Furthermore, the upper header 15 of the case 14 is provided with a breathable filter 19 to prevent dust and particulates from floating or scattering into the cabin, and this part is connected to the gas ventilation space 4 of the cabin via piping 20. They are connected in communication so that hydrogen gas released from or adsorbed by the hydrogen storage alloy 17 can flow between the hydrogen storage alloy 17 and the inside of the machine. Further, 22a, 22b, and 22c are a pipe 18a that forms a cooling water bypass path connected to one opening of the case 14, and a cooler 13 connected to the pipe 18a.
A pipe 21 that connects the pipe 10b near the outlet of the pipe 21 and a pipe 20 that serves as a hydrogen gas flow path that connects the upper header 15 and the inside of the machine.
These are solenoid valves installed at appropriate locations.

In the hydrogen pressure adjustment system of the hydrogen-cooled turbine generator configured as described above, the hydrogen storage alloy filled in the case 14 has a hydrogen equilibrium pressure of 5.2 K'i/cr1 at a temperature of, for example, 80° to 60°C. With the above, the hydrogen equilibrium pressure is 1.0 Kfl/c when the cooling water temperature on the low temperature side is 45° to 40°C.
It is assumed that the one that is equal to or less than M is selected. Under these conditions, the solenoid valve 22a is now open, and the solenoid valve 22a is now open.
b, 22c are in the closed state, the cooling water flows from the tank 11 of the pure supply bag N9 to the hollow conductor of the stator winding 2 through the piping 10b,
Inflow through the inflow side header 8b, and the outflow side header 8
Tank 11 of pure water supply device 9 through pipe 10a from a
The stator winding 2 is cooled by the stator winding cooling water circulation system, and at this time, the temperature of the stator winding cooling water rises due to heat due to electrical loss in the windings, and becomes waste hot water.

This waste hot water is further transferred to the bypass pipe 18a and the solenoid valve 22.
a into the case 14, where the hydrogen storage alloy 1
After heating 7, it returns to tank 11 through piping 18b.

Therefore, since the solenoid valve 22c is closed, case 1
4 is pressurized by the hydrogen gas generated from the hydrogen storage alloy 17 to the hydrogen equilibrium pressure at the temperature of the discharged hot water.

On the other hand, when the solenoid valves 22a and 22b are closed and the solenoid valve 22C is opened, the low-temperature cooling water flowing out from the outlet of the cooler 13 flows into the case 14 through the pipe 21.
The hydrogen storage alloy 17 inside is cooled and returned to the tank 11. Therefore, in this case, the hydrogen gas in the case 14 is adsorbed by the hydrogen storage alloy 17, so the hydrogen gas pressure in the case 14 is reduced to the hydrogen equilibrium pressure at the temperature of the cooling water.

Here, its specific effect will be explained based on the load pattern shown in FIG.

In FIG. 2, when the load is low such as at night (as shown between D and A), the solenoid valve 22a in FIG.
2b and 22c are kept closed.

In this way, as described above, the hot water flowing out from the header 8a on the cooling water outflow side of the stator winding 2 can be transferred to the case 14.
The hydrogen storage alloy 17 filled in the case 14 is warmed by flowing through the tank 11 of the pure water supply device 9, and the hydrogen gas generated from the hydrogen storage alloy 17 causes the inside of the case 14 to rotate at 100% load. The allowable hydrogen pressure for electrical equipment is 5.2 atm or more. When you are in a situation like this,
In the morning (shown between A and 8), when the load increases, the opening degree of the solenoid valve 22C is adjusted according to the load. Case 1
4, hydrogen gas is released into the machine through piping 20.

Therefore, the hydrogen gas pressure inside the machine increases to the permissible hydrogen gas pressure for the load.

Note that the solenoid valve 22G is opened only when necessary and is normally closed.

When the load increase is completed and the load reaches the eight stable points, the solenoid valves 22a and 22C are closed, the solenoid valve 22b is opened, and the low temperature cooling water flowing out from the cooler 13 flows into the case 14. Therefore, since the hydrogen storage alloy 17 inside the case 14 is cooled, the hydrogen gas pressure inside the case 14 is 1. C1
/m or less, in preparation for the evening load reduction.

In the evening, when the load decreases as shown between C and D in the figure, the electromagnetic valve 19c is opened according to the load at that time, and its opening degree is adjusted to allow the hydrogen gas inside the aircraft to flow into the case 14 and to release hydrogen. It is adsorbed onto the storage alloy 17 and adjusted to an allowable hydrogen gas pressure for the load.

Then, when the load reduction is completed and the load reaches the stable point shown in the figure, the solenoid valve 22a is opened in the opposite direction.
2b and 22c are closed, and the waste hot water flowing out from the cooling water outflow side header 8a of the stator winding 2 flows into the case 14 in the same manner as described above, and the hydrogen storage alloy 1 in the case 14 is transferred to the heat exchanger 14.
7 and increase the hydrogen gas pressure in the case 14 to 5.2 kg/
Keep it above CD to prepare for the rise in load in the morning.

As described above, according to this embodiment, the hydrogen storage alloy 17
The characteristics of the hydrogen equilibrium pressure are 5.2Kg/80° to 60°C.
cil1 or more, hydrogen equilibrium pressure at 456-40°C is 1. C
The conditions are less than 1/CIj, which makes it easy to select a hydrogen storage alloy, and since hydrogen storage alloys are in powder form, they have poor thermal conductivity, which reduces the time lag between when heating and cooling start until the specified pressure is reached. However, since the system prepares for the next load once the load has stabilized, it is possible to quickly adjust the pressure in response to load fluctuations. Furthermore, since the hydrogen storage alloy is heated using waste hot water after cooling the stator windings, it is extremely advantageous in terms of energy. Furthermore, since the hydrogen storage alloy is in powder form, when hydrogen gas is released from the case 14, there is a risk that it may enter the machine as dust and deteriorate the electrical withstand voltage.
Since the filter 19 is provided on the upper header 15 of the case 14, there is no need to worry about this, and reliability can be improved.

Of course, since the hydrogen gas pressure inside the machine is adjusted according to the load, wind loss and fan power during partial loads are reduced, improving the efficiency of the rotating electrical machine and reducing heat cycles of the rotating electrical machine components. Therefore, the life of the rotating electric machine becomes longer and reliability increases. In addition, it is possible to adjust the hydrogen gas pressure without consuming hydrogen gas, and the rotation Nl1
During periodic inspection of the III, all hydrogen gas can be recovered in the hydrogen storage alloy without being released into the atmosphere, so energy can be used effectively.

Next, another embodiment of the present invention will be described.

Figure 3 shows another configuration example of the hydrogen pressure adjustment system of a hydrogen-cooled rotating electric machine. The same parts as in Figure 1 are given the same symbols and their explanations are omitted, and only the different parts will be described here. . In this embodiment, as shown in FIG. 3, two cases 14A and 14B are provided, and one opening of each of the cylinders is connected to a cooling water outlet header 88 and a pure supply bag M9.
A pipe 18a1 is placed in the middle of the pipe 10a connecting the tanks 11.
18a2 and its piping 18a1.
A solenoid valve 23, 24 is provided in the middle of 18a2, and piping 18b1, 18b2 for returning the cooling water to the tank 11 of the pure supply bag M9 is connected to the other opening, and the case 14A,
Solenoid valves 25 and 26 are provided in the middle of the branch pipes branching off from the pipes 18a1 and 18a2 near one opening of the cooler 14B, and these are commonly connected. Connect to piping 10b. In addition, the upper headers of cases 14A and 14B are connected to piping 20, respectively.
A and '20b are connected to the inside of the machine, and solenoid valves 27 and 28 are provided in the middle of these pipings 20a and 20b, and furthermore, the upper header is commonly connected by two pipings, and a solenoid valve 30 is installed in the middle of the piping. The configuration is such that the following is provided.

Next, the operation of the above configuration will be explained based on the load pattern shown in FIG.

In FIG. 4, it is assumed that at point F in the morning in the drawing, one case 14A is in a high pressure state and the other case 14B is in a low pressure state. In this state, morning, afternoon,
Pressure adjustment for load fluctuations from E to F in the evening is performed as follows. First, case 14 occurs when the load increases.
The solenoid valve 27 on the A side is opened and its opening degree is adjusted to release hydrogen gas into the machine and increase the hydrogen gas pressure inside the machine.

On the other hand, when the load is reduced, the electromagnetic valve 28 on the case 14B side is opened and its opening degree is adjusted to adsorb hydrogen gas inside the machine and reduce the hydrogen gas pressure inside the machine.

In this case, as in the embodiment of FIG. 1, solenoid valves 23 and 26 are open, solenoid valves 24 and 25 are closed, and solenoid valve 3o is also closed.

As a result of the above daytime operations, case 14A releases a certain amount of hydrogen gas, and case 14B adsorbs hydrogen gas inside the aircraft. Here, this state will be explained with reference to the characteristic curve diagram of the hydrogen storage alloy shown in FIG. That is, in FIG. 5 showing the relationship between the amount of hydrogen in the hydrogen storage alloy in cases 14A and 14B and the hydrogen equilibrium pressure, if the load is now at one point in FIG. If the load is at point F, it will move to point 2 due to the release of hydrogen gas. Further, in case 14B, when the load is at one point, it is at point 4, and when it is at point F, it moves to point 5 due to absorption of hydrogen gas. When the load passes point F in Figure 4 and enters the night, and the load becomes stable at a low level, the solenoid valve 3o is opened to communicate between the heat exchangers 14A and 14B, and the hydrogen storage alloy is filled. Allow hydrogen gas to flow in and out of the room.

In this case, it goes without saying that the solenoid valves 26 and 27 are closed. In this way, in the characteristic curve of the hydrogen storage alloy shown in Fig. 5, the hydrogen gas pressures in cases 14A and 14B will be the same, and the value will be P = (Pa + Pb)
/2. That is, case 14A releases hydrogen gas to case 14B, case 14B adsorbs hydrogen gas, and case 14A moves to point 3 and case 14B moves to point 6.

Therefore, the hydrogen gas content in case 14A is small, and the hydrogen gas content in case 14B is large, so that the hydrogen content is completely reversed from point E in the load pattern shown in FIG. When this state reaches an equilibrium state, the solenoid valve 30 is closed, and the solenoid valves 23 and 26 are further closed and the solenoid valves 24 and 25 are opened to reverse the temperature of the cooling water that heats and cools the hydrogen storage alloy. In this case, the solenoid valve 25.27
Of course, it is in a closed state. If you do this,
Case 14A is at low pressure and case 14.8 is at high pressure in preparation for morning load fluctuations.

In the above embodiment, when the load at night is extremely low and the exhaust heat temperature of the stator winding cooling water is low, the hydrogen storage alloy adjusts the maximum pressure 1 at the exhaust heat temperature, for example, 5.2 Kg/crd.
If the above does not occur, as shown in Figure 6, a cooling water reheater 3 is connected to the pipe 10a connected to the cooling water discharge side Hellagu.
1 may be provided to increase the exhaust heat temperature.

In addition, if the load pattern fluctuates extremely frequently day and night, there is no time to switch between the high-pressure case and the low-pressure case in advance, so in such cases, two sets of high-pressure and low-pressure cases are prepared. You may also make it correspond by doing so.

By providing a plurality of cases (two in the above embodiment) in this manner, it is possible to quickly adjust the in-machine hydrogen gas pressure of the rotating electrical machine in accordance with the load even when the load pattern changes.

In the embodiments shown in FIGS. 1 and 3 described above, a stator winding water cooling system is used as the medium for cooling and heating the hydrogen storage alloy, but it is also possible to use hydrogen gas, which is the cooling medium of the rotating electric machine. You can also do this.

In this case, for heating the hydrogen storage alloy, high-temperature hydrogen gas is introduced into the case before the inlet of the hydrogen gas cooler installed in the machine, and low-temperature hydrogen gas is introduced into the case at the outlet of the hydrogen gas cooler. This can be carried out by introducing the liquid into the case for cooling.

〔Effect of the invention〕

As described above, in the present invention, a case containing a hydrogen storage alloy that releases or adsorbs hydrogen gas according to temperature changes is provided outside the rotating electrical machine that is cooled by hydrogen gas, and the cooling medium for the rotating electrical machine is installed in this case. The pipe to be introduced is connected to communicate with the inside of the machine, and the pipes for flowing hydrogen gas into and out of the hydrogen gas circulation system inside the machine are connected, and a valve is provided in the middle of each pipe. When the in-machine hydrogen gas pressure is adjusted in accordance with load fluctuations by letting the cooling medium of the rotating electrical machine flow in and out of the flow path to cool or heat the hydrogen storage alloy, the cooling medium of the rotating electrical machine is used as the hydrogen storage alloy. Select a hydrogen storage alloy whose hydrogen equilibrium pressure is equal to or higher than the maximum regulated pressure inside the machine at the discharge temperature, and whose hydrogen equilibrium pressure is below the minimum regulated pressure inside the machine at the supply temperature of the cooling medium of the rotating electric machine. The gas pressure in the case is kept above the maximum adjustment pressure limit or below the minimum adjustment pressure limit, and the valve is opened and closed according to load fluctuations to release hydrogen gas into the aircraft or to adsorb hydrogen gas inside the aircraft. It is designed to adjust the hydrogen gas pressure. Therefore, the conditions for selecting a hydrogen storage alloy are extremely relaxed, making it easy to select a hydrogen storage alloy.Also, by heating or cooling the hydrogen storage alloy in advance, the hydrogen gas pressure inside the case can be adjusted to exceed the maximum pressure limit. or below the minimum limit, so even if the load suddenly changes, the inside of the aircraft can be maintained by opening the solenoid valve installed in the middle of the pipe that flows hydrogen gas into and out of the hydrogen gas circulation system inside the aircraft. It is possible to provide a hydrogen pressure adjustment method for a hydrogen-cooled rotating electrical machine that can quickly adjust hydrogen gas pressure.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a hydrogen pressure adjustment system of a hydrogen-cooled rotating electric machine showing an example for explaining the method of the present invention, and Fig. 2 is a load pattern diagram of the rotating electric machine for explaining the operation of the same embodiment. , FIG. 3 is a configuration diagram of a hydrogen pressure adjustment system of a hydrogen-cooled rotating electrical machine for explaining another embodiment of the present invention, and FIG. 4 is a load pattern diagram of the rotating electrical machine for explaining the operation of the same embodiment. , 26- Fig. 5 is a state diagram of adsorption and release of hydrogen gas by the hydrogen storage alloy for the load pattern shown in Fig. 4, and Fig. 6 is a cooling diagram in which stator winding cooling water is introduced into the heat exchanger in Fig. 3. A partial configuration diagram showing a modified example of the water introduction system, Figures 7 and 8 are diagrams for explaining an example of the characteristics of the hydrogen storage alloy, and Figure 9 shows the characteristics of the hydrogen storage alloy and the stator winding. FIG. 10 is a diagram illustrating the relationship between cooling water outlet temperature and allowable in-machine hydrogen gas pressure, and is a configuration diagram showing a hydrogen pressure adjustment system of a conventional turbine generator. 1...Stator frame, 2...Stator winding, 3...Stator core, 4...Space, 5...・Rotor, 6... Self-fan, 7... Hydrogen gas, 8a, 3b... Header, 10a11ob... Piping, 11...
... Tank, 12 ... Pump, 13 ...
... Cooler, 14.14A, 14B ... Case, 15 ... Upper header of case, 16 ...
... Heat exchanger tube, 17 ... Hydrogen storage alloy, 18a
, 18a1, 18a2゜18b, 18bl, 18b2・
...Piping, 19...Filter, 20.2
0a, 20b...Piping, 22a-22c, 23
~30...Solenoid valve. Fig. 4 Fig. 5 Fig. 6 Shikiichi e, to R B Son Chiang Shen/) 7 ↑ Shinshi Ji A Zan Fig. 8 Reikin ri Fig. 9 Fig. 7 Fig. 10

Claims (4)

[Claims] (1) A case containing a hydrogen storage alloy that releases or adsorbs hydrogen gas depending on changes in humidity is installed outside the rotating electric machine that is cooled by hydrogen gas, and piping for introducing the cooling medium for the rotating electric machine into this case is connected to the inside of the machine. At the same time, pipes for inflowing and outflowing hydrogen gas are connected to the hydrogen gas circulation system inside the machine, and a valve is provided in the middle of each pipe. When adjusting the in-machine hydrogen gas pressure according to load fluctuations by cooling or heating the hydrogen storage alloy by letting the cooling medium in and out, the hydrogen storage alloy is used to maintain hydrogen equilibrium at the discharge temperature of the cooling medium of the rotating electric machine. By selecting a hydrogen storage alloy whose pressure is above the maximum regulated pressure inside the machine and whose hydrogen equilibrium pressure is below the minimum regulated pressure inside the machine at the supply temperature of the cooling medium of the rotating electric machine, the gas inside the case is The pressure is kept above the maximum adjustment pressure limit or below the minimum limit, and the hydrogen gas pressure inside the machine is adjusted by opening and closing the valve according to load changes to release hydrogen gas into the machine or adsorb hydrogen gas inside the machine. A method for adjusting hydrogen pressure in a hydrogen-cooled rotating electric machine, characterized by: (2) The cooling medium of the rotating electric machine that flows in and out of the flow path formed in the case is cooling water for the windings.Claim 1
Hydrogen pressure adjustment method for hydrogen-cooled rotating electric machines described in Section 1. (3) The method for adjusting hydrogen pressure in a hydrogen-cooled rotating electric machine according to claim 1, wherein the cooling medium of the rotating electric machine flowing in and out of the flow path formed in the case is hydrogen gas from an internal circulation system. (4) A patent claim in which a plurality of cases are provided to be connected to the hydrogen gas circulation system in the machine and the cooling medium inflow/outflow system of the rotating electric machine, and these are divided into high pressure states and low pressure states to cope with load fluctuations. A method for adjusting hydrogen pressure in a hydrogen-cooled rotating electric machine according to any one of items 1 to 3.