JP2003088040A - Flywheel accumulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flywheel device which can be mounted on a mover. SOLUTION: The interior of a casing 2 is partitioned into a depressurizing chamber 11 and an oil chamber 12, and the insides of both chambers are depressurized and kept at around 0.2 atmospheric pressure. Within the depressurizing chamber 11, a rotor 18 is supported rotatably with bearing unit 25 and 30. An oil pump 14 for supplying the bearing units 25 and 30 with oil is provided within the oil chamber 12. An oil shade 44 is provided above the rotor 18, and an upper discharge passage 45 to lead the oil discharged from the bearing unit 25 and 30 is made between the oil shade 44 and the casing 2. A flinger ring 46 is provided in the section of the rotor 18 opposed to the above discharge path 45, and the peripheral end of the flinger ring 45 is positioned within the upper discharge path 45. The oil discharged from the bearing unit 25 is led into the upper discharge path 45, being flung off by the flinger ring 46, and it is returned into the oil chamber 12, being carried along the inside periphery of the casing 2 from the upper discharge path 45.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flywheel power storage that stores electric power in the form of rotational energy by rotating a flywheel (hereinafter referred to as a rotating body) at high speed, and converts the rotational energy into electric power as necessary. The present invention relates to a device, and more particularly to a flywheel power storage device suitable for a moving body (for example, a bus, a passenger car, a tram, a railroad, etc.) that frequently repeats running and stopping.

[0002]

2. Description of the Related Art As an example of a flywheel power storage device of this type, a rotary container made of carbon fiber is rotatably supported by a magnetic levitation bearing inside a vacuum container, and a rotary container is installed inside a normal pressure container. There is known a structure in which a rotating body made of a steel material is rotatably supported by a pivot bearing (JP-A-7-322533).

[0003]

In the former case, since the inside of the container is evacuated, it is possible to sufficiently reduce the windage loss at the time of high speed rotation of the rotating body and to secure a high energy density. .

However, if the inside of the container is evacuated, the following problems occur. Since there is no heat transfer due to air in the container,
It becomes difficult to dissipate internally generated heat such as electric motors and bearings. Since the lubricating oil of the bearing evaporates, it is not possible to construct a bearing using oil. For this reason, the magnetic levitation type bearing has to be used, but the magnetic levitation type bearing has the following problems. a. The device is complicated and expensive. b. Since it is used in a non-contact manner, it has a long lifespan, but tends to become unstable, and once it becomes unstable, it cannot be restored again, so support fails. Therefore, it cannot be mounted on a moving body with a high go-stop frequency. c. Since the magnetic bearing of the superconducting type is expensive, and a separate cooling means is required, the device becomes large-scale and can be mounted on a moving body with a high go-stop frequency. Can not. d. Since additional electric power is required to maintain the magnetic bearing, an additional loss is generated. High-strength materials such as carbon fiber are used for the rotating body because steel materials do not have enough strength to rotate at high speeds.However, because the materials are expensive and it is difficult to fit and assemble different materials, rotation is difficult. The body becomes expensive. Insulation characteristics deteriorate due to the absence of air, and it is difficult to operate the motor because sufficient insulation cannot be obtained.
From the above, it is far from practical use.

The latter can be manufactured at low cost, but has the following problems. Since the rotating body is rotated in the atmospheric air, the wind loss is extremely large. For this reason, the device has a large loss. Since the rotating body is supported only by the pivot bearing, the support becomes unstable and becomes difficult to use in an environment where tilting and vibration constantly occur, such as a moving body with a high go-stop frequency.

The present invention has been made in view of the above problems, and has a long life, is safe, has a low loss, is inexpensive, does not break down against an oscillating load, is compact, An object of the present invention is to provide a flywheel power storage device that can be easily mounted on a moving body with a high gostop frequency.

[0007]

Up to now, a vertical flywheel power storage device using an oil-lubricated bearing that operates in a reduced pressure environment has not been seriously studied. It is 1. There is a problem with the treatment (seal) of lubricating oil for the bearings located on the upper side. 2. Lubricating oil easily evaporates when the pressure is reduced. Was the cause. In the present invention, with respect to the problem 1, the contact between the swing-off ring having a small diameter and the rotating body is avoided by the oil umbrella, and with respect to the problem 2, the atmospheric pressure is set to 0.0 instead of vacuum.
By setting the pressure to 5 atm to 0.33 atm, preferably around 0.2 atm, while suppressing wind loss, preventing evaporation of oil,
Made it possible to operate electric equipment such as pumps and electric motors normally. In addition, by incorporating the oil tank, when the gimbal is supported, it acts as a damper, and a new effect can be obtained.

In order to solve the above problems, based on the above background, the present invention employs the following means. That is, the invention according to claim 1 is such that a casing whose interior is divided into two chambers of a decompression chamber and an oil chamber, a rotating body made of a steel material and the like rotatably provided in the decompression chamber, and a rotating body for rotating the rotating body. An oil-lubricated bearing unit that supports freely, an oil pump that is provided in the oil chamber and that supplies oil in the oil chamber to the bearing unit, a stator that is provided in the decompression chamber, and a rotor that also serve as the rotor. A rotor and a generator, and the stator includes a support shaft fixed in the decompression chamber and made of a metal having good heat conductivity, and an iron core and windings provided around the support shaft. Is composed of the rotating body and a permanent magnet provided in the rotating body, and is configured to maintain the decompression chamber and the oil chamber at 0.05 atm to 0.33 atm. Characterized in that it was. According to the flywheel power storage device of the present invention, the decompression chamber and the oil chamber are depressurized and maintained at a predetermined atmospheric pressure. Further, the oil lubrication type bearing unit is lubricated by the oil supplied from the oil pump. Furthermore, the rotating body
The load reduction device will support a given percentage of its own weight. In addition, the wind loss is greatly reduced, the oil is hardly evaporated, and the electric motor is sufficiently insulated.

The invention according to claim 2 is the flywheel power storage device according to claim 1, wherein an oil umbrella is provided at an upper end portion of the decompression chamber, and the bearing is provided between the oil umbrella and the casing. An upper discharge passage for guiding oil from the unit is formed, a swing-off ring is provided on the rotating body, and an outer peripheral end portion of the swing-off ring is positioned in an inlet portion of the upper discharge passage. According to the present invention, the oil discharged from the bearing unit is shaken off by the swing-off ring and guided into the upper discharge path, so that the oil is prevented from coming into contact with the rotating body.

The invention according to claim 3 is the flywheel power storage device according to claim 2, wherein an oil cover for covering the rotating body is provided on the oil umbrella, and the oil cover is provided between the oil cover and the casing. A side discharge passage is formed to connect the upper discharge passage and the oil chamber. According to the flywheel power storage device of the present invention, the oil guided from the bearing unit into the upper discharge passage is guided from the upper discharge passage into the side discharge passage to prevent contact with the rotating body. Become.

The invention according to claim 4 is the flywheel power storage device according to any one of claims 1 to 3, characterized in that a radiation fin is provided on an outer peripheral portion of the casing. According to the flywheel power storage device of the present invention,
The heat dissipation area of the casing is increased, and the heat inside the casing is more effectively dissipated to the outside.

The invention according to claim 5 is the flywheel power storage device according to claim 4, characterized in that a radiation fin is provided in a portion of the casing corresponding to the bottom surface of the oil chamber. According to the flywheel power storage device of the present invention, the heat of the oil chamber is radiated to the outside more effectively.

The invention according to claim 6 is the flywheel power storage device according to any one of claims 1 to 5, wherein a spiral or vertically folded oil passage is provided in the support shaft of the stator, It is characterized in that the oil is circulated in the oil passage. According to the flywheel power storage device of the present invention, the heat of the support shaft of the stator is taken by the oil flowing in the oil passage, and the heat of the support shaft of the stator is radiated more effectively.

The invention according to claim 7 is the flywheel power storage device according to any one of claims 1 to 6, wherein a clearance is formed in a portion of the rotating body facing the winding of the stator, or It is characterized in that a metal having good conductivity is attached. According to the flywheel power storage device of the present invention, the induction heating is significantly reduced by the magnetic flux generated from the winding, and an extra loss is not generated.

The invention according to claim 8 is the flywheel power storage device according to any one of claims 1 to 7, wherein a drain port for guiding the oil from the bearing unit into the oil chamber is provided in the oil chamber. A partition is provided to keep away from the suction port of the oil pump. According to the flywheel power storage device of the present invention, the hot oil discharged from the bearing unit is prevented from being immediately introduced into the suction port, and the sufficiently cooled oil is guided to the suction port.

The invention according to claim 9 is the flywheel power storage device according to any one of claims 1 to 8, characterized in that the entire device is supported by a gimbal mechanism. According to the flywheel power storage device of the present invention, the influence of the gyro moment generated by the tilt of the moving body is eliminated, and the load applied to the bearing unit can be reduced.

The invention according to claim 10 is the flywheel power storage device according to any one of claims 1 to 9, characterized in that an orifice is provided in the oil chamber. According to the flywheel power storage device of the present invention, resistance is generated when the oil moves due to the inclination of the device, and the oil in the oil tank functions as a damper.

The invention according to claim 11 is the flywheel power storage device according to any one of claims 1 to 10, characterized in that a helium gas cylinder and a pressure adjusting mechanism are provided, and the inside of the casing is replaced with helium gas. And According to the flywheel power storage device of the present invention, the same performance as when the pressure is reduced to a predetermined atmospheric pressure is obtained.
In addition, the characteristics relating to insulation and heat dissipation are further improved.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a flywheel power storage device according to the present invention.
The flywheel power storage device 1 includes a casing 2 and a rotating body 18 rotatably provided in the casing 2.

The casing 2 has a cylindrical upper side wall 3, a disc-shaped upper end plate 4 that closes an upper end opening of the upper side wall 3, and an aluminum disc-shaped upper end plate 4 that closes a lower end opening of the upper side wall 3. Lower end plate 6, tubular lower side wall 9 whose upper end opening is closed by lower end plate 6, and disk-shaped bottom plate 1 which closes the lower end opening of lower side wall 9
It is composed of 0 and 0.

A sealed decompression chamber 11 is formed in a portion surrounded by the upper mirror plate 4, the upper side wall 3, and the lower mirror plate 6, and a rotary body 18 is rotatably provided in the decompressed chamber 11. There is. A sealed oil chamber 12 is formed in a portion surrounded by the lower side wall 9, the lower end plate 6, and the bottom plate 10, and the upper bearing unit 25 and the lower bearing unit 30 which are oil lubricated bearings are lubricated in the oil chamber 12. Oil 13 for filling is filled.

The decompression chamber 11 and the oil chamber 12 communicate with each other through a communication hole 7 provided in the lower end plate 6, and the oil 13 discharged from the upper bearing unit 25 through this communication hole 7 Are returned to the oil chamber 12. The decompression chamber 11 and the oil chamber 12 are connected to a decompression device (not shown) composed of a decompression pump and the like, and the decompression device is operated to maintain a reduced pressure of about 0.2 atm. An oil pump 14 is provided in the oil chamber 12, and the oil 13 in the oil chamber 12 is transferred by the oil pump 14 to the upper bearing unit 25 and the lower bearing unit 3.
It is supplied to 0.

The rotating body 18 is made of a general steel material, and is composed of a main body portion 19 and a rotary shaft 22 integrally provided in the central portion of the main body portion 19. The rotating body 18 is rotatably supported by an upper bearing unit 25 having an upper end portion of a rotating shaft 22 provided at a central portion of the upper end plate 4, and a lower bearing described later having a lower end portion of the rotating shaft 22 provided at a central portion of the lower end plate 6. By being pivotally supported by the unit 30, it becomes rotatable within the decompression chamber 11.

The main body 19 has a cylindrical shape with its upper end closed, and a rotary shaft 22 is integrally provided on its axis. The inner peripheral surface of the side plate of the main body portion 19 is formed in two stages of a large diameter portion 20 and a small diameter portion 21.
A cylindrical permanent magnet 43 that constitutes the rotor 42 of the electric motor 35 is attached to the.

The rotary shaft 22 is provided integrally with the upper shaft 23 integrally provided at the central portion of the upper surface of the upper plate of the main body portion 19, and integrally provided at the central portion of the lower surface of the upper plate, and the tip end thereof is lower than the lower end of the side plate. And a lower shaft 24 that protrudes inward. An upper end of the upper shaft 23 of the rotary shaft 22 is rotatably supported by an upper bearing unit 25 described later, and a lower shaft 24
The lower end of the shaft is rotatably supported by a lower bearing unit 30 described later.

The upper bearing unit 25 is attached to the central portion of the upper mirror plate 4, and has a base 26 fitted in the bearing mounting hole 5 in the central portion of the upper mirror plate 4 and the base 2.
6 is a roller bearing 2 mounted at the inlet of the shaft insertion hole 27.
8 and a bearing 2 for emergency touch-up, which is a dynamic pressure type thrust bearing mounted inside the shaft insertion hole 27 of the base 26.
And the rotary shaft 22 on the inner peripheral side of the roller bearing 28.
The upper shaft 23 is rotatably supported. A predetermined gap is formed between the emergency touch-up bearing 29 and the upper end of the upper shaft 23 of the rotating shaft 22, and the gap causes the emergency touch-up bearing 29 to be in a normally inoperative state.
The emergency touch-up bearing 29 is prevented from causing a loss.

The lower bearing unit 30 is attached to the central portion of the lower end plate 6, and has a base 31 fitted in the bearing mounting hole 8 in the central portion of the lower end plate 6 and a base 3.
1 and an angular contact ball bearing 34 mounted at the inlet of the shaft insertion hole 33, the lower shaft 24 of the rotary shaft 22 is rotatably supported on the inner peripheral side of the angular contact ball bearing 34. ing.

In this embodiment, the roller bearing 28 is used for the upper bearing unit 25 and the angular ball bearing 34 is used for the lower bearing unit 30, but other mechanical bearings such as ball bearings and needle bearings are used. Alternatively, a dynamic pressure radial bearing, a dynamic pressure thrust bearing, a dynamic pressure pivot bearing, or the like may be used, or a combination of these may be used to support the thrust load and the radial load. In addition,
The upper bearing unit 25 does not necessarily have to support the thrust load.

A cylindrical support shaft 37 made of aluminum is integrally erected at the center of the upper surface of the lower end plate 6, and the lower shaft 24 of the rotary shaft 22 of the rotary body 18 is rotatable around the center of the support shaft 37. It is designed to be inserted into. The iron core 3 is provided around the support shaft 37.
8 is attached, and a winding 39 is attached to the iron core 38. Between the upper coil projecting portion 40 of the winding 39 and the rotating body 18 facing it,
The large diameter portion 20 of the side plate of the main body portion 19 of the rotating body 18 forms an escape 41 at a predetermined distance.

The support shaft 37, the iron core 38, and the windings 39 form a stator 36, the permanent magnet 43 and the rotating body 18 form a rotor 42, and the stator 36 and the rotor 42 form an electric motor 35. It is something.

A disk-shaped oil umbrella 4 is provided at the upper end of the decompression chamber 11 so as to face the lower surface of the upper mirror plate 4 at a predetermined interval.
4 is provided, and the oil 1 discharged from the upper bearing unit 25 is between the upper surface of the oil umbrella 44 and the lower surface of the upper end plate 4.
3 upper discharge passages 45 are formed.

A ring-shaped swing-off ring 46 is integrally attached to a portion of the upper shaft 23 of the rotary shaft 22 of the rotary body 18 corresponding to the upper discharge passage 45, and an outer peripheral end portion of this swing-off ring 46 is discharged to the upper side. It is located in the entrance of the passage 45. Therefore, the swing-off ring 46 is
The oil 13 discharged from the upper bearing unit 25 is shaken off by the centrifugal force of the shake-off ring 46 and is guided into the upper discharge passage 45 when it is rotated integrally with.
The oil 13 introduced into the upper discharge passage 45 is the oil umbrella 4
Since the outer peripheral end surface of 4 is close to the inner peripheral surface of the upper side wall 3, the inner peripheral surface of the upper side wall 3 is dropped from a minute gap between the outer peripheral end surface and the inner peripheral surface of the upper side wall 3, It is guided to the communication hole 7 of the lower end plate 6 and returned from the communication hole 7 into the oil chamber 12. The oil 13 discharged from the lower bearing unit 30 is returned to the oil chamber 12 through a discharge hole 32 provided in the base 31 of the lower bearing unit 30.

A permanent magnet type load reducing device 47 is provided on the lower surface side of the oil umbrella 44 facing the outer peripheral edge of the upper surface of the rotating body 18. Load reduction device 47
Is fixed to the upper end plate 4 side integrally with the oil umbrella 44 by a bolt penetrating the load reducing device 47 and the oil umbrella 44. Rotating body 1 by load reducing device 47
50 to 80% of its own weight is supported.

A rotation detecting device 48 is provided above the upper shaft 23 of the rotating shaft 22 of the rotating body 18.
The rotation angle of the rotating body 22 is detected by 8.

The discharge port 15 of the oil pump 14 and the upper bearing unit 25 and the lower bearing unit 30 are interconnected via an oil supply pipe 17, and the upper bearing unit 25 and the upper bearing unit 25 are connected via the oil supply pipe 17. Oil is supplied to the lower bearing unit 30.

When a voltage is applied to the winding 39 of the stator 36 from an external power source, the rotor 18, which is the rotor 42, rotates at high speed, and electrical energy is converted into rotational energy and stored. Then, if necessary, the rotational energy of the rotating body 18 is converted into electric energy and supplied to an external load.

In the flywheel power storage device 1 according to this embodiment configured as described above, since the upper and lower end portions of the rotating body 18 are supported by the upper bearing unit 25 and the lower bearing unit 30, the swinging motion is suppressed. The support does not break due to dynamic vibration, and it can be effectively used in a moving body (bus, passenger car, tram, railroad, etc.) having a high go-stop frequency.

Further, since the oil-lubricated upper bearing unit 25 and the lower bearing unit 30 are used to support the rotating body 18, the material of the rotating body 18 needs to be a carbon fiber composite material which is expensive and difficult to assemble. Not both bearing units 25, 30
Since it can be made of a general steel material in accordance with the upper limit of the bearing rotation speed of, the structure can be made very inexpensively.

Further, the oil 13 discharged from the upper bearing unit 25 is shaken off at a low frequency by the small-diameter swing-off ring 46 and guided into the upper discharge passage 45, and the inner peripheral surface of the upper side wall 3 is discharged from the upper discharge passage 45. Since it is transmitted back to the inside of the oil chamber 12 without causing a shake-off loss, it does not come into contact with the rotating body 18.
Therefore, the oil 13 discharged from the upper bearing unit 25 comes into contact with the rotating body 18 and is shaken off by the outer edge portion of the rotating body 18 having a high peripheral speed, resulting in a very large energy loss, and the high rotating speed of the rotating body 18 is increased. There is no problem that the oil shaken off due to the speed is mist or vaporized, which raises the wind loss and is sucked out by decompression, and the energy loss that occurs when the oil is shaken off is greatly reduced. You will be able to

Further, since the oil 13 discharged from the upper bearing unit 25 is shaken off by the shake-off ring 46 having a small diameter, the mist particle size at the time of shake-off becomes large and the oil is hard to evaporate, so that it is vaporized. Wind loss does not increase due to the oil.

Further, since 50-80% of the weight of the rotating body 18 is supported by the load reducing device 47, the loss of the lower bearing unit 30 is greatly reduced, and the life of the oil 12 is greatly extended. become.

Further, since the pressure inside the casing 2 is reduced to around 0.2 atm, the wind loss is greatly reduced, the oil 13 is hardly evaporated, and the electric motor 35 is sufficiently insulated. Secured in.

Further, the upper coil protruding portion 4 of the electric motor 35
The large-diameter portion 20 is provided in the portion of the rotating body 18 facing 0, and the large-diameter portion 20 forms the escape 41 at a predetermined distance. Therefore, induction heating is greatly reduced by the magnetic flux generated from the winding 39. Therefore, unnecessary loss will not occur. Instead of the escape 41, as shown in FIG.
The same effect can be obtained by attaching a metal plate 49 having a small electric resistance, such as a copper or aluminum plate, to the portion of the rotating body 18 facing the upper coil projecting portion 40.

Further, since the support shaft 37 and the lower end plate 6 are made of a material having good heat conductivity, the heat generated by the iron core 38 of the electric motor 35 is well conducted, and the heat is sufficiently radiated from the surface of the casing 2. Will be done.

Further, the longer the amount of deterioration of the oil 13 is, the longer the amount of oil 13 is. However, in this embodiment, a sufficient volume of the oil 13 can be secured in the oil chamber 12, so that the maintenance period is significantly long. It will be possible to continue operation for a long time (minimum 8 years) in a maintenance-free state.

Further, since all of the components such as the oil pump 14 are provided in the depressurized casing 2, the entire apparatus becomes compact, and the pressure difference is taken into consideration when circulating the oil 13 despite the depressurization. There is no such thing.

As shown in FIG. 3, a cylindrical oil cover 50 is integrally provided on the lower surface side of the outer peripheral end portion of the oil umbrella 44, and an upper portion is provided between the oil cover 50 and the inner peripheral surface of the upper side wall 3. By forming the side discharge passage 51 that communicates between the discharge passage 45 and the oil chamber 12, the oil 13 from the upper discharge passage 45 can be completely covered.
Since the oil 13 that drops inside 1 is not scattered by the air flow generated by the rotation of the rotating body 18, even some of the misted oil is liquefied by the collision with the upper side wall 3, and the oil is more completely oiled. It can be collected in the chamber 12. Further, as shown in FIG. 4, by providing a partition plate 52 inside the oil chamber 12 for partitioning the drain port 32 for oil discharged from the lower bearing unit 30 and the suction port 16 of the oil pump 14, Hot oil returned from the lower bearing unit 30 into the oil chamber 12 is not immediately guided to the suction port 16, so that sufficiently cooled oil can be supplied to the upper bearing unit 25 and the lower bearing unit 30. is there.

FIG. 5 shows a second embodiment of the flywheel power storage device according to the present invention. In this flywheel power storage device 1, the peripheral surface of the upper side wall 3 of the casing 2 and the lower side wall 9 are shown. Radiating fins 53, 54, 55 are provided on the peripheral surface and the bottom surface of the bottom plate 10, and an oil passage 56 (spiral shape (FIG. 6), top and bottom folded shape (FIG. 7)) is provided inside the front surface side of the support shaft 37. The other configurations are the same as those shown in the first embodiment.

In this case, the oil passage 56 is connected to an oil pump (not shown). In addition,
The oil passage 56 may be connected to the oil pump 14 for the upper bearing unit 25 and the lower bearing unit 30.

Also in this embodiment, in addition to showing the same effect as in the first embodiment, the casing 2
Since the heat transfer area is expanded by the heat dissipation fins 53 on the upper side wall 3, the heat inside the device is more efficiently dissipated to the outside. Further, since the oil circulates in the oil passage 56 provided inside the surface of the support shaft 37, the heat of the iron core 38 of the electric motor 35 is taken away by this oil, and the temperature of the iron core 38 is reduced. It can be lowered. Further, since the heat radiation fins 54 and 55 are provided also on the peripheral surface of the lower side wall 9 of the oil chamber 12 and the lower surface side of the bottom plate 10, the heat of the oil in the oil chamber 12 is also efficiently radiated. .

Further, also in this embodiment, FIG.
As shown in, by providing a partition plate 52 inside the oil chamber 12 for partitioning the drain port 6a for oil discharged from the lower bearing unit 25 and the support shaft 30 and the suction port 16 of the oil pump 14, The hot oil returned from the lower bearing unit 25 and the support shaft 37 into the oil chamber 12 is not immediately guided to the suction port 16, so that sufficiently cooled oil can be supplied to the upper bearing unit 25, the lower bearing unit 30, and the support shaft 37. Can be supplied to.

In each of the above-described embodiments, by supporting the entire apparatus by the known gimbal support mechanism, the influence of the gyro moment generated by the tilt of the moving body is eliminated, and the load applied to each bearing is reduced. Is what you can do.

Further, as shown in FIG. 8, the oil chamber 12
The inside of the partition is divided into a plurality of small chambers by the partition wall 57, and the partition wall 5
7, a circular orifice 58 that communicates between the small chambers adjacent to 7.
May be provided. In this case, the oil moves between the small chambers via the orifice 58 due to the inclination of the entire apparatus, and the resistance at this time can function as a damper, so that the damper of the gimbal mechanism can be omitted. Is. The orifice may have a semicircular shape (FIG. 9), a gap (FIG. 10), a square shape (FIG. 11), or the like.

Further, in each of the above-mentioned embodiments, the inside of the casing 2 is depressurized to about 0.2 atm, but since the helium gas has a wind loss almost equal to 0.2 atm, the pressure adjustment with the helium gas cylinder is performed. The same performance can be obtained even if a vessel is installed side by side and helium is filled at about 1 atm. In this case, the characteristics relating to insulation and heat dissipation are further improved. The pressure inside the casing 2 is preferably in the range of 0.05 atm to 0.33 atm. The reason is that, in the Perschen characteristic shown in FIG. 12, that is, in the characteristic showing the relationship between the dielectric breakdown voltage (KV unit) and the pressure (atmospheric pressure unit), the atmospheric pressure at which the dielectric breakdown does not occur at the voltage value (600 V) in the embodiment is The lower limit value is 0.05 atm, and the lower limit value of the pressure that does not cause dielectric breakdown is selected according to the voltage value. Further, the upper limit value of the pressure is set according to the number of rotations so that the windage loss with respect to the rotational movement is within the allowable range. When the rotation speed is 10,000 rpm as in the embodiment, the upper limit is 0.33 atm. Becomes

Further, in each of the above-mentioned embodiments, the rotation detecting device 48 is required because it is constituted by the synchronous motor, but when it is constituted by the induction motor, the rotation detecting device 48 is required.
Is not necessarily required.

[0056]

As described above, according to the present invention, the inside of the casing has a predetermined atmospheric pressure (0.
Since the pressure is maintained at a reduced pressure (about 2 atm), the wind loss is greatly reduced, the oil is hardly evaporated, and the insulation of the electric motor is sufficiently ensured. Further, since the load reducing device supports a predetermined percentage (for example, 50 to 80%) of the weight of the rotating body, the loss of the bearing unit can be significantly reduced, and the life of the oil can be significantly extended. Become. further,
Since all parts such as the oil pump are provided in the casing, the entire device can be made compact.
Further, it is not necessary to consider the atmospheric pressure when circulating the oil, even though the pressure is reduced. Furthermore, since a sufficient volume of oil can be secured in the oil chamber, the maintenance period can be greatly extended, and the maintenance-free state can be operated for a long period of time.

Further, according to the second or third aspect, the oil discharged from the bearing unit is shaken off by the swing-off ring and guided into the upper discharge passage, and the oil is discharged from the upper discharge passage into the side discharge passage. Since the oil is prevented from coming into contact with the rotating body and is not directly applied to the rotating body, the energy loss generated when the oil is shaken off can be significantly reduced. Further, since the oil from the bearing unit is shaken off by the shaker ring with a small diameter, the mist particle size at the time of shakeoff becomes large, and the oil becomes difficult to vaporize, so the vaporized oil will not increase the windage loss. . Further, when the oil is transmitted from the oil umbrella through the side wall portion and drops, the side wall can also be cooled.

Further, according to the fourth aspect, the heat inside the casing is efficiently radiated to the outside. Further, according to the fifth aspect, the heat in the oil chamber is efficiently dissipated to the outside. Further, according to the sixth aspect, the heat of the winding of the stator is taken by the oil in the oil passage, so that the temperature of the winding can be lowered.

Further, according to the seventh aspect of the invention, the induction heating is greatly reduced by the magnetic flux generated from the winding, and an unnecessary loss is eliminated.

Further, according to the eighth aspect, the hot oil discharged from the bearing unit is not immediately introduced into the suction port, and the sufficiently cooled oil can be introduced into the intake port. .

Further, according to the ninth aspect of the invention, the influence of the gyro moment generated by the inclination of the moving body is eliminated, so that the load applied to the bearing unit can be reduced. Further, according to the tenth aspect, since the resistance can be generated when the oil moves due to the inclination of the device, the oil in the oil chamber can function as a damper.

Further, according to the eleventh aspect, it is possible to obtain the windage loss equivalent to that when the pressure is reduced to a predetermined atmospheric pressure, and the equivalent performance is obtained.

[Brief description of drawings]

FIG. 1 is a first flywheel power storage device according to the present invention.
3 is a vertical cross-sectional view showing the entire embodiment of FIG.

FIG. 2 is a partial view showing a modified example of the first embodiment.

FIG. 3 is a partial view showing a modified example of the first embodiment.

FIG. 4 is a partial view showing a modified example of the first embodiment.

FIG. 5 shows a second flywheel power storage device according to the present invention.
3 is a vertical cross-sectional view showing the entire embodiment of FIG.

FIG. 6 is a partial view showing a modification of the second embodiment.

FIG. 7 is a partial view showing a modification of the second embodiment.

FIG. 8 is a partial view showing a modified example of the first and second embodiments.

9 is a partial view showing a modified example of the one shown in FIG.

FIG. 10 is a partial view showing a modified example of the one shown in FIG.

FIG. 11 is a partial view showing a modified example of that shown in FIG.

FIG. 12 is a chart showing the relationship between the pressure inside the casing and the dielectric breakdown voltage.

[Explanation of symbols]

1 ... Flywheel power storage device 2 ... Casing 11 ... Decompression room 12 ... Oil chamber 14 ... Oil pump 18 ... Rotating body 25 ... Upper bearing unit 30 ... Lower bearing unit 35 ... Generator 36 ... Stator 37 ... Support shaft 38 ... Iron core 39 ... Winding 41 ... run away 42 ... rotor 43 ... Permanent magnet 44 ... oil umbrella 45 ... Upper discharge path 46 ... Shaking off ring 47 ... Load reduction device 50 ... Oil cover 51 ... Side discharge path 52 ... Partition board 53, 54, 55 ... Radiating fins 58 ... Orifice

Continued front page    (72) Inventor Hiroyuki Kondo             Shinkoden 150, Motoyashiki, Miyaya-cho, Toyohashi City, Aichi Prefecture             Machinery Toyohashi Works F term (reference) 5H607 AA02 AA04 BB01 BB02 BB07                       BB14 BB17 BB25 CC01 DD01                       DD02 DD16 EE42 FF12 GG07                       GG08 GG25 HH01 KK10

Claims (11)

[Claims] 1. A casing whose interior is divided into two chambers, a decompression chamber and an oil chamber, a rotating body rotatably provided in the decompression chamber, and an oil-lubricated bearing unit for rotatably supporting the rotating body. An oil pump that is provided in the oil chamber and supplies oil in the oil chamber to the bearing unit; a rotor that is provided in the decompression chamber and that is also provided in the decompression chamber and that also serves as the rotating body; And a stator formed of a metal support shaft fixed in the decompression chamber, an iron core and windings provided around the support shaft, and the rotor includes the rotor. And a permanent magnet provided on the rotating body, wherein the pressure reducing chamber and the oil chamber are depressurized from approximately 0.05 atm to 0.33 atm. Power storage device. 2. The flywheel power storage device according to claim 1, wherein an oil umbrella is provided at an upper end portion of the decompression chamber,
An upper discharge passage for guiding oil from the bearing unit is formed between the oil umbrella and the casing, a swing-off ring is provided on the rotating body, and an outer peripheral end portion of the swing-off ring is provided in an inlet portion of the upper discharge passage. A flywheel power storage device characterized in that it is located at. 3. The flywheel power storage device according to claim 2, wherein the oil umbrella is provided with an oil cover for covering the rotating body, and the upper discharge path and the casing are provided between the oil cover and the casing. A flywheel power storage device, characterized in that a side discharge passage communicating with the oil chamber is formed. 4. The flywheel power storage device according to claim 1, wherein a radiation fin is provided on an outer peripheral portion of the casing. 5. The flywheel power storage device according to claim 4, wherein a radiation fin is provided on a portion of the casing corresponding to a bottom surface of the oil chamber. 6. The flywheel power storage device according to claim 1, wherein the support shaft of the stator comprises:
A flywheel power storage device comprising a spiral or vertically folded oil passage and allowing oil to circulate in the oil passage. 7. The flywheel power storage device according to claim 1, wherein a clearance is formed in a portion of the rotating body facing the winding of the stator, or a metal having good conductivity is used. A flywheel power storage device characterized by being attached. 8. The flywheel power storage device according to claim 1, wherein the oil chamber has a drain port for introducing oil from the bearing unit into the oil chamber.
A flywheel power storage device, characterized in that a partition plate is provided to keep away from the suction port of the oil pump. 9. The flywheel power storage device according to claim 1, wherein the entire device is supported by a gimbal mechanism. 10. The flywheel power storage device according to claim 1, wherein an orifice is provided in the oil chamber. 11. The flywheel power storage device according to claim 1, further comprising a helium gas cylinder and a pressure adjusting mechanism, wherein the inside of the casing is replaced with helium gas. apparatus.