JP2015019565A - Power storage device and electric power system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable electric energy, input into a motor, to be efficiently converted to rotational energy of a rotary member and stored, without causing complication and upsizing of a structure, in a power storage device comprising the motor and the rotary member.SOLUTION: In a power storage device (10) comprising a rotary member (1) and a motor (30), electric energy input into the motor (30) is converted to rotational energy of the rotary member (1) and stored. On the premise of the power storage device (10), the rotary member (1) is at least partially formed of ceramic, carbon fiber or fiber-reinforced plastic, and suspended from a motor shaft (31) of the motor (30).

Description

  The present invention relates to a power storage device that stores electrical energy as rotational energy of a rotating member.

  2. Description of the Related Art Conventionally, a power storage device that stores electrical energy as energy obtained by rotation of a rotating member (hereinafter also referred to as rotational energy) is known. And among these electrical storage apparatuses, as shown to patent document 1, there exists a thing in which a rotating member has a flywheel.

  The power storage device of Patent Document 1 is configured to store electric energy supplied to the motor as rotational energy of the flywheel by supplying electric power to the motor and rotating the flywheel. Even if power supply to the motor is stopped, the flywheel continues to rotate. And by transmitting the rotational force of a flywheel to a motor as needed, a motor becomes a generator and generates electricity.

  Here, the conventional power storage device increases the rotational energy of the flywheel and stores more electric energy by increasing the mass of the flywheel as much as possible.

JP 2002-95209 A

  However, when the mass of the flywheel increases, the friction loss of the bearing that supports the flywheel shaft portion increases, and there is a problem that electrical energy cannot be efficiently stored as rotational energy.

  In the power storage device of Patent Document 1, a permanent magnet is fixed to the lower surface of the flywheel, and a superconducting magnet is disposed below the permanent magnet with a space therebetween, and electromagnetic generated between the permanent magnet and the superconducting magnet. The flywheel is lifted by force. This reduces the friction loss of the rolling bearing that supports the upper and lower parts of the shaft portion of the flywheel. However, in order to make the above superconducting magnet function, it is necessary to provide a cryogenic refrigerator. As a result, the structure of the power storage device becomes complicated and large.

  The present invention has been made in view of such a point, and in an electric storage device including a motor and a rotating member, the electric energy input to the motor can be efficiently rotated without causing a complicated structure and an increase in size. The object is to be able to convert and store the rotational energy of the member.

  The first invention includes a rotating member (1, 1a) and a motor (30), and converts electrical energy input to the motor (30) into rotational energy of the rotating member (1, 1a) and stores it. A power storage device is assumed. The rotating member (1, 1a) of the power storage device is at least partially formed of ceramics, carbon fiber, or fiber reinforced plastic, and is suspended from the motor shaft (31) of the motor (30).

  In a second aspect based on the first aspect, the rotating member (1) includes an inertial body (3) and a motor shaft (31) of the motor (30) in a state where the inertial body (3) is fixed. And a shaft portion (2) containing ceramics, carbon fiber, or fiber reinforced plastic.

  In a third aspect based on the second aspect, the inertial body (3) of the rotating member (1) is made of ceramics, carbon fiber, or fiber reinforced plastic.

  According to a fourth invention, in any one of the first to third inventions, the first permanent magnet (12a) fixed to a lower end portion of the shaft portion (2) of the rotating member (1), and the rotation The first and second permanent magnets having a second permanent magnet (12b) embedded in the bottom surface of the storage chamber (22) containing the member (1) and arranged so as not to contact each other (12a, 12b) It is provided with the suppression part (11) which suppresses the whirling at the time of rotation of the said rotation member (1) with the magnetic force which acts between (12a, 12b).

  According to a fifth invention, in any one of the first to fourth inventions, the fifth invention includes a joint portion (5) having a plurality of magnets stacked vertically and attracted to each other, and the motor shaft (31) of the motor (30). ) Is fixed to the uppermost magnet, and the shaft (2) of the rotating member (1) is located between the magnets adjacent to the flange (4) formed at the upper end of the shaft (2). It is fixed by being pinched.

  In a sixth aspect based on any one of the first to fifth aspects, the ceramic included in the rotating member (1, 1a) is an aluminum titanate ceramic.

  According to a seventh invention, in any one of the first to sixth inventions, the seventh invention includes a casing (20, 80) for accommodating the rotating member (1, 1a), and the ceramic of the rotating member (1, 1a) is The sintered body of the aluminum titanate ceramics, when the load exceeding the limit value is applied to the rotating member (1,1a), the sintered body of the aluminum titanate ceramics of the rotating member (1,1a) Is configured to be crushed in the casing (20, 80).

  In an eighth aspect based on the seventh aspect, the wall body facing the storage chamber (22, 90) of the casing (20, 80) contains an aluminum titanate ceramic.

  In a ninth aspect based on the first aspect, the rotating member (1a) includes an inertial body (3a) suspended directly from a motor shaft (31) of the motor (30), and the inertial body (3a) is formed of ceramics, carbon fiber, or fiber reinforced plastic.

  A tenth invention is the ninth invention, comprising a casing (80) containing the inertial body (3a), wherein the lower end surface of the inertial body (3a) is formed by a convex curved surface (81). The casing (80) has an inner surface facing the curved surface (81) of the inertial body (3a) as a concave curved surface (82), and the center of the curved surface (81) of the inertial body (3a). And the central portion of the curved surface (82) of the casing (80) are in contact with each other.

  An eleventh invention is the ninth or tenth invention, wherein the first permanent magnet (85) fixed to the lower end portion of the rotating member (1a) and a storage chamber for storing the rotating member (1a) 90) having a second permanent magnet (86) embedded in the bottom surface thereof, and acting between the first and second permanent magnets (85, 86) arranged so as to be in non-contact with each other. Thus, a suppression portion (87) that suppresses the swinging of the rotating member (1a) during rotation is provided.

  In a twelfth aspect of the invention according to any one of the first to eleventh aspects, the rotation member (1, 1a) is attached to the rotation center of the rotation member (1, 1a) along the circumferential direction along the outer circumferential surface of the rotation member (1, 1a). The marker (55) attached at a certain height, the marker position sensor (56) for detecting the amount of blur at the position of the marker (55), and the amount of blur detected by the marker position sensor (56) are predetermined. An abnormality detection unit (57) for a rotating member that outputs an abnormality signal when the value exceeds the value is provided.

  According to a thirteenth aspect, in the first aspect, the casing (20, 80) in which the rotating member (1, 1a) is accommodated, and the bubble tube level (60, 80) fixed to the casing (20, 80). ), A bubble position sensor (63) for reading the position of the bubble (62) of the bubble tube level (60), and the position of the bubble (62) read by the position sensor, the casing (20, 80) An abnormality detection unit (64) for the casing that outputs an abnormality signal when it is detected that the levelness or verticality is outside the predetermined range is provided.

  In a fourteenth aspect of the present invention, the rotational energy stored in the plurality of power storage devices (10) of any one of the first to thirteenth aspects and the rotating member (1, 1a) of the power storage device (10) is converted into electrical energy. When causing all the power storage devices (10) to perform the discharge operation after conversion, the output amount of the electric energy of all the power storage devices (10) is changed in the same cycle and the output of the power storage device (10) is changed. And a system control unit (75) for providing a phase difference so that the changes in the strength over time are inconsistent.

  According to the present invention, since at least a part of the rotating member is formed of any one of ceramics, carbon fiber, and fiber reinforced plastic, when the entire rotating member is formed of a metal such as steel. In comparison, the weight of the rotating member can be reduced. Conventional power storage devices have been designed to store rotational energy by making the mass of the rotating member as heavy as possible, but the power storage device of the present invention can rotate a lighter rotating member at a higher speed than before. The peripheral speed ratio of the rotating member is increased, and the rotational energy equal to or higher than that of the conventional one is stored.

  By reducing the weight of the rotating member, the rotating member can be suspended and rotated on the motor shaft of the motor, and the structure of the power storage device can be simplified as compared with the related art.

  In addition, by reducing the weight of the rotating member, energy loss due to friction of the bearing that supports the motor shaft of the motor can be reduced, and electric energy input to the motor can be efficiently converted into rotational energy of the rotating member and stored. Can do.

  Here, all of the rotating members may be formed of any one of ceramics, carbon fibers, and fiber reinforced plastics. In addition, a part of the rotating member is formed of one of ceramics, carbon fiber, and fiber reinforced plastic, and the remaining part of the rotating member is formed of the rotating member of ceramics, carbon fiber, and fiber reinforced plastic. It may be formed of a different part. The remaining part of the rotating member may be formed of a material other than ceramics, carbon fiber, or fiber reinforced plastic.

  The rotating member may include an inertial body, and the inertial body may be directly suspended from the motor shaft of the motor. The rotating member may be composed only of an inertial body. The rotating member may include an inertial body and a shaft portion, and the inertial body may be suspended from the motor shaft of the motor via the shaft portion.

  In addition, when the rotating member is suspended from the motor shaft and the lower end of the rotating member is a free end, the rotating member is easily swung around, but since the permanent magnet is provided in both the rotating member and the storage chamber, The magnetic force acting between these permanent magnets can prevent the rotating member from swinging around.

  In addition, the motor shaft and the rotating member can be connected simply by superimposing a plurality of magnets on the top and bottom, and the connection work between the motor shaft and the rotating member can be easily performed as compared with, for example, bolt fastening. it can.

  Further, if the rotating member is formed of any one of ceramics, carbon fiber, and fiber reinforced plastic, eddy current loss that hinders the rotating motion of the rotating member can be reduced. If aluminum oxide ceramics are used, the eddy current loss that hinders the rotational movement of the rotating member can be further reduced. Moreover, since the aluminum titanate ceramics are excellent in heat resistance, thermal deformation of the rotating member during high rotation is suppressed. Moreover, since the aluminum titanate-based ceramics are excellent in mechanical strength, damage to the rotating member during high rotation is suppressed within the limit load.

  In addition, since the rotating member itself is crushed when a load exceeding the limit load is applied to the rotating member, the damage to the motor is reduced compared to the case where the rotating member does not pulverize and buckles like steel. can do. In other words, when the rotating member buckles, the buckled rotating member collides with the inner surface of the casing, and the impact of the collision is transmitted to the motor through the shaft of the rotating member, and the motor may be damaged. In the case of the invention, since the rotating member is pulverized without buckling, the impact is not transmitted to the motor, so that damage to the motor can be minimized.

  In addition, if a load exceeding the limit load acts on the rotating member and the rotating member is pulverized, the pulverized product pops out at supersonic speed due to the rotating member rotating at a higher speed than before. Here, when the wall of the casing is made of metal, when the supersonic pulverized material collides, a pressure exceeding the Yugonio elastic limit acts on the wall, and the pulverized material passes through the liquefied wall. However, by including aluminum titanate-based ceramics in the wall, it is possible to prevent the wall from becoming liquefied and prevent the pulverized material from penetrating. Can do.

  In addition, when a supersonic pulverized product collides with an aluminum titanate ceramic wall, the collided portion generates heat between 1500 ° C. and 1800 ° C., but aluminum titanate ceramic has heat resistance and thermal shock resistance. Since the low expansion characteristic is excellent, even if the collision portion is recessed, the casing wall body is not completely damaged by the expansion due to the heat generated by the collision described above.

  Further, since the rotating member rotates while being suspended from the motor shaft, when the rotating member is not swung around, the rotation posture is constant, and the marker attached to the rotation center of the rotating member, Or, the position of the marker attached to the outer peripheral surface of the rotating member at a certain height along the circumferential direction does not fluctuate, but if the rotating member swings around, the rotating member's posture during rotation is disturbed. The position of the marker is blurred. In the present invention, when the sensor detects the positional deviation of the marker, the abnormality detection unit of the rotating member outputs an abnormality signal. From this abnormal signal, it is possible to determine that the rotating member is swung without viewing the rotating member.

  Further, when the rotating member is suspended from the motor shaft, for example, in a cantilever state, the axial direction of the rotating member is always along the vertical direction if there is no swing. Even when the casing is installed in an inclined state, the axial direction of the rotating member is the vertical direction. For this reason, the rotating member easily comes into contact with the inner surface of the casing. In the present invention, when the casing is installed at an inclination, the sensor detects the deviation of bubbles in the bubble tube level and the abnormality detection unit of the casing outputs an abnormality signal. From this abnormal signal, it can be determined that the casing is installed tilted without looking at the bubble tube level.

  In addition, in an electric power system including a plurality of power storage devices according to any one of the first to thirteenth inventions, when a plurality of power storage devices perform a discharging operation, the output amount of electric energy of all the power storage devices is set to the same period. And the phase difference is provided so that the change over time in the output amount of the power storage device does not match, so that electric energy can be efficiently extracted from the plurality of power storage devices.

It is a longitudinal cross-sectional view of the electrical storage apparatus which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the electrical storage apparatus which concerns on the modification 1 of 1st Embodiment. It is a longitudinal cross-sectional view of the suppression part vicinity of the electrical storage apparatus which concerns on the modification 2 of 1st Embodiment. It is a longitudinal cross-sectional view of the joint part of the electrical storage apparatus which concerns on the modification 3 of 1st Embodiment. It is a longitudinal cross-sectional view of the joint part of the electrical storage apparatus which concerns on the modification 4 of 1st Embodiment. It is a longitudinal cross-sectional view of the electrical storage apparatus which concerns on the modification 5 of 1st Embodiment. It is a figure which shows the relationship between the flywheel of the electrical storage apparatus which concerns on the modification 6 of 1st Embodiment, a marker, a marker position sensor, and an abnormality detection part. It is a figure which shows the relationship between the flywheel of the electrical storage apparatus which concerns on the modification 7 of 1st Embodiment, a marker, a marker position sensor, and an abnormality detection part. It is a figure which shows the electrical storage apparatus which concerns on the modification 8 of 1st Embodiment, (a) shows the relationship between a casing and a bubble tube type level, (b) shows a bubble tube type level, a bubble position sensor, The relationship with an abnormality detection part is shown. It is a figure which shows the electrical storage apparatus which concerns on the modification 8 of 1st Embodiment, (a) shows the relationship between a casing and a bubble tube type level, (b) shows a bubble tube type level, a bubble position sensor, The relationship with an abnormality detection part is shown. It is the schematic of the electric power system which concerns on 2nd Embodiment. It is a graph of the output voltage of each electrical storage apparatus of an electric power system. It is a side view of the flywheel concerning other embodiments. It is a longitudinal cross-sectional view of the electrical storage apparatus which concerns on other embodiment. It is a longitudinal cross-sectional view of the electrical storage apparatus which concerns on other embodiment. It is a longitudinal cross-sectional view of the electrical storage apparatus which concerns on other embodiment.

<< First Embodiment >>
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

  The power storage device (10a) according to the first embodiment of the present invention stores electrical energy as rotational energy, converts the stored rotational energy into electrical energy as necessary, and takes it out. Since this power storage device (10a) is simpler than the conventional one and can be reduced in size, it is used for small-scale business establishments or general households.

  As shown in FIG. 1, the power storage device (10a) includes a casing (20), a rotating member (1), a joint portion (5), a motor (30), a vacuum pump (40), and a control unit (50). I have. The motor (30) and the rotating member (1) are accommodated in the casing (20), and the vacuum pump (40) and the control unit (50) are disposed outside the casing (20).

  The casing (20) is formed in a substantially cylindrical shape whose upper and lower ends are closed. The casing (20) includes an upper member (20a) and a lower member (20b) disposed above and below, and a partition plate (6) disposed between the upper member (20a) and the lower member (20b). And are joined by welding. In the present embodiment, the upper member (20a) and the lower member (20b) are joined by welding. However, the present invention is not limited to this. For example, the upper member (20a) and the lower member (20b) Both members (20a, 20b) may be connected by fastening a male screw formed on one side and a female screw formed on the other side. Thereby, the inside of a casing (20) can be open | released easily.

  The inside of the casing (20) is vertically divided by a disk-shaped partition plate (6). The upper side of the partition plate (6) is the motor chamber (21), and the lower side of the partition plate (6) is the accommodating chamber (22) of the rotating member (1).

  Two openings (23a, 23b) into which the suction pipe (41) of the vacuum pump (40) is inserted are formed on the side wall of the casing (20). Of these openings (23a, 23b), one opens to the motor chamber (21) and the other opens to the accommodation chamber (22) of the rotating member (1). When the vacuum pump (40) is started, the motor chamber (21) and the storage chamber (22) are evacuated through the suction pipe (41) of the vacuum pump (40). An insertion port for the power line (53) of the motor (30) is formed in the side wall of the casing (20). The motor (30) and the control unit (50) are electrically connected via the power line (53).

  The motor (30) is located in the motor chamber (21) in the casing (20). The motor (30) has a rotor (not shown), a stator (not shown), and a motor shaft (31). A stator formed in a substantially cylindrical shape is fixed inside the motor (30). A rotor to which the motor shaft (31) is fixed is arranged in the hollow portion of the stator. One end of the power line (53) of the motor (30) is connected to the stator.

  The control unit (50) includes a vacuum pump operating unit (51) and a motor operating unit (52). The vacuum pump operating part (51) controls the start / stop operation of the vacuum pump (40). The motor operating unit (52) controls the switching operation between the charging operation and the discharging operation. During the charging operation, the motor operating unit (52) supplies external power to the motor (30) through the power line (53), so that the motor (30) becomes an electric motor and rotates the rotating member (1). Thus, the electrical energy supplied to the motor (30) is stored as the rotational energy of the rotating member (1). Even when the supply of power to the motor (30) is stopped, the rotating member (1) continues to rotate until there is no rotational energy.

  In the power storage device (10a) of the present embodiment, the vacuum pump operating unit (51) activates the vacuum pump (40) while the rotating member (1) is rotating. Thereby, the inside of a casing (20) will be in a vacuum state and the windage loss of a rotating member (1) will reduce. Due to this reduction in windage loss, the rotational resistance of the rotating member (1) decreases, and the rotating member (1) continues to rotate for a longer time even after the power supplied to the motor (30) is stopped. In the present embodiment, the inside of the casing (20) is evacuated to reduce the windage loss of the rotating member (1). However, the present invention is not limited to this. For example, nitrogen gas or helium gas is supplied into the casing (20). You may make it enclose in. Since nitrogen gas and helium gas have a specific gravity smaller than that of air, the windage loss of the rotating member (1) can be reduced.

  On the other hand, in the motor operating section (52), during the discharge operation, the rotor of the motor (30) rotates with the rotation of the rotating member (1), and the motor (30) becomes a generator with the rotation of the rotor. Power generation. Electric power generated by the motor (30) is sent to the outside. In this way, electric energy is extracted from the rotational energy of the rotating member (1).

  The rotating member (1) includes a shaft portion (2) and a plurality of flywheels (3) as inertial bodies. The shaft portion (2) is formed of an aluminum titanate ceramic. A disc-shaped flange (4) is formed at the upper end portion of the shaft (2). The parts other than the collar part (4) are formed in a long and thin cylindrical shape. The bearing (25) of the motor shaft (31) in the partition plate (6) of the casing (20) is formed of a sintered body of an aluminum titanate ceramic.

  The flywheel (3) is made of a carbon fiber material. The flywheel (3) is non-magnetic. The flywheel (3) is formed in a disk shape having a constant axial thickness as a whole. A plurality of flywheels (3) are fixed in the axial direction at predetermined intervals in the cylindrical portion of the shaft portion (2). The flywheel (3) may be composed of a spread carbon fiber thin-layer laminate.

  Thus, in the rotating member (1), the shaft (2) is formed of an aluminum titanate ceramic and the flywheel (3) is formed of a carbon fiber material. The rotating member (1) can be reduced in weight as compared with the case where the rotating member (1) is formed of metal such as.

  The conventional power storage device stores rotational energy by increasing the mass of the rotating member (1) as much as possible. However, in the power storage device (10a) of the first embodiment, the rotating member ( By rotating 1) at a higher speed than before, it is configured to store rotational energy equivalent to or higher than that of the conventional one.

  Here, since the flywheel (3) is rotated at a higher speed than before, it is possible that the flywheel (3) becomes hot and causes thermal deformation, but the flywheel (3) is made of carbon fiber material. By doing so, the above-described thermal deformation can be prevented.

  In addition, the weight of the rotating member (1) can be reduced by suspending the rotating member (1) from the motor shaft (31) and rotating it. There is no need to rotate while floating by a superconducting magnet, and the structure of the power storage device (10a) can be made simpler and smaller than before.

  Further, the weight reduction of the rotating member (1) can reduce energy loss due to friction between the motor shaft (31) and the bearing (25) of the partition plate (6) of the casing (20). (1) can continue to turn longer.

  In addition, in the conventional power storage device, the flywheel (3) was rotated while being floated by the superconducting magnet, so an eddy current caused by the superconducting magnet was generated in the flywheel (3), and the flywheel (3) was rotated. However, in the power storage device (10a) according to the first embodiment, the rotating member (1) is reduced in weight by the superconducting magnet. Since it is not necessary to float 1), eddy currents caused by superconducting magnets do not occur. Thereby, electrical energy can be efficiently stored as rotational energy.

  The joint portion (5) connects between the motor shaft (31) of the motor (30) and the shaft portion (2) of the rotating member (1). The joint portion (5) includes four disc-shaped neodymium magnets for joint (6a to 6d) which are stacked one above the other and adsorb to each other. The lower end portion of the motor shaft (31) is fixed to the center portion of the first neodymium magnet for coupling (6a) from the top. Further, a through hole is formed in the center of the fourth joint neodymium magnet (6d) from the top. The inner peripheral surface of the through hole is formed such that the inner diameter of the upper part is larger than the inner diameter of the lower part. The flange part (4) of the shaft part (2) described above is fitted into the upper part of the through hole, and the cylindrical part of the shaft part (2) passes through the lower part of the through hole. And, when the collar part (4) of the shaft part (2) of the rotating member (1) is sandwiched between the third and fourth neodymium magnets for coupling (6c, 6d) from the top, the rotating member (1) Is fixed to the joint (5). In this way, the steel motor shaft (31) and the ceramic shaft (2) are firmly connected by utilizing the attractive force of the joint neodymium magnets (6a, 6b, 6c, 6d). .

(Modification 1 of the first embodiment)
The power storage device (10b) of Modification 1 shown in FIG. 2 is different from the power storage device (10a) of the first embodiment in that the power storage device (10b) of the first embodiment includes a suppression unit (11) that suppresses the swing of the rotating member (1). . Only the differences will be described below.

  The suppression portion (11) has two suppression neodymium magnets (12a, 12b) as first and second permanent magnets. One suppressing neodymium magnet (12a) has a hemispherical shape. This hemispherical suppressing neodymium magnet (12a) is fixed to the lower end of the shaft (2) of the rotating member (1). The other suppressing neodymium magnet (12b) is formed in an annular shape. The annular restraining neodymium magnet (12b) is embedded in the inner surface of the recess (26) formed in the center of the bottom surface of the storage chamber (22). The inner diameter of the annular suppression neodymium magnet (12b) is formed larger than the diameter of the hemispherical suppression neodymium magnet (12a).

  The shaft portion (2) of the rotating member (1) is arranged so that the lower end portion thereof is positioned at the inner center of the recess (26) of the storage chamber (22). Thereby, it comprises so that the inner peripheral surface of a cyclic | annular suppression neodymium magnet (12b) may surround the outer surface of a hemispherical suppression neodymium magnet (12a). Since the outer surface of the hemispherical suppression neodymium magnet (12a) and the inner peripheral surface of the annular suppression neodymium magnet (12b) have the same magnetic pole, these suppression neodymium magnets (12a, 12b) have a repulsive force. Arise. Due to this repulsive force, the lower end of the shaft (2) of the rotating member (1) tends to be positioned at the center of the inner surface of the recess (26) of the storage chamber (22). Thereby, the whirling of the shaft part (2) of the rotating member (1) is suppressed.

(Modification 2 of the first embodiment)
The power storage device (10c) of Modification 2 shown in FIG. 3 is that the suppression unit (11) has two suppression neodymium magnets (12a, 12b) formed in a flat plate shape. Different from 10b). Only the differences will be described below.

  In the suppressing portion (11) of the second modification, one suppressing neodymium magnet (12a) is fixed to the lower end surface of the shaft portion (2) of the rotating member (1). The other neodymium magnet for suppression (12b) is embedded in the center of the bottom surface of the storage chamber (22). When the rotating member (1) is suspended from the motor shaft (31), both the suppressing neodymium magnets (12a, 12b) are configured to face each other with a gap therebetween. In the case of the modification 2, similarly to the modification 1, the swinging of the shaft portion (2) of the rotating member (1) can be suppressed by the repulsive force between the suppressing neodymium magnets (12a, 12b). Compared to the case of the first modification, the neodymium magnet for suppression (12a, 12b) can be easily molded.

(Modification 3 of the first embodiment)
The power storage device of Modification 3 includes two joint neodymium magnets (6a, 6b) whose joint portions (5) are stacked one above the other and adsorbed to each other, and the first embodiment and Modification 1 This is different from the power storage device (10a, 10b) of Modification 2. Only the differences will be described below.

  In the joint part (5) of Modification 3, as shown in FIG. 4, the motor shaft (31) is fixed to the upper surface of the upper joint neodymium magnet (6a) via the knock pin (35). Also, the flange (4) of the shaft (2) of the rotating member (1) is fitted into the space (36) formed between the two joint neodymium magnets (6a, 6b). Is fixed by sandwiching it with neodymium magnets (6a, 6b) on both sides. Thereby, compared with the joint part (5) of 1st Embodiment, the number of the neodymium magnets for joints (6a, 6b) can be reduced, and the cost reduction of an electrical storage apparatus can be aimed at.

(Modification 4 of the first embodiment)
The power storage device of Modification 4 includes three stainless steel members (46a, 46b, 46c) whose joint portions (45) are vertically stacked, and a plurality of hexagons that fasten these stainless steel members (46a, 46b, 46c). It differs from 1st Embodiment and the modifications 1-3 by the point provided with a volt | bolt (47). Only the differences will be described below.

  In the joint part (45) of the modified example 4, as shown in FIG. 5, an upper space part (48) is formed between the first and second stainless steel members (46a, 46b) from the top, and 2 from the top. A lower space (49) is formed between the third and third stainless steel members (46b, 46c). The flange (4) formed at the lower end of the motor shaft (31) is fitted into the upper space (48), and the flange (4) of the shaft (2) of the rotating member (1) is moved to the lower space ( 49) Insert and tighten the four hexagon bolts (47) in the vertical direction. Thus, the motor shaft (31) and the rotating member (1) can be connected without using the joint neodymium magnets (6a, 6b, 6c, 6d). The joint portion (45) is not limited to a stainless steel member, and may be a non-magnetic member, for example, an aluminum alloy.

(Modification 5 of the first embodiment)
The power storage device (10d) of Modification 5 is the first in that the rotating member (1) is formed of a sintered body of an aluminum titanate ceramic and the wall of the casing (20) is formed of a multilayer structure. 1 and the power storage devices of Modification 1 to Modification 4 are different. Only the differences will be described below. In addition, in FIG. 6 which shows the electrical storage apparatus (10d) of the modification 5, the suppression part (11) of the modification 2 is illustrated, and the joint part (45) of the modification 4 is illustrated.

  The casing (20) includes a base (27b) and a body (27a). The base (27b) is formed in a rectangular parallelepiped shape. The body (27a) is formed in a substantially cylindrical shape. A body (27a) is erected vertically to the upper surface of the base (27b). The casing (20) has an aluminum titanate ceramic layer (28a), a non-woven fabric layer (28b) containing carbon fiber yarns, a stainless steel or aluminum metal layer (28c). Is a multilayer structure laminated from the inside to the outside of the casing (20). The carbon fiber yarn of the nonwoven fabric layer (28b) is an example, and may be a glass fiber yarn, for example.

  The rotating member (1) is configured so that the rotating member (1) itself is crushed when a load exceeding the limit load is applied. The damage of the motor (30) can be reduced as compared with the case where the rotating member (1) buckles like a steel material without being crushed. That is, when the rotating member (1) is buckled, the rotating member (1) in the buckled state collides with the inner surface of the casing (20), and the impact of the collision is transmitted through the shaft (2) of the rotating member (1). It is considered that the motor (30) is damaged by being transmitted to the motor (30). However, in the case of the modified example 5, since the rotating member (1) is crushed without buckling, the impact is not transmitted to the motor (30). Damage to the motor (30) can be minimized.

  Here, if the rotating member (1) is pulverized, the pulverized material pops out at supersonic speed because the rotating member (1) rotates at a higher speed than before. Here, when the wall of the casing (20) is made of metal, when the supersonic pulverized material collides with the wall, a pressure exceeding the Yugonio elastic limit acts on the wall, and the wall is liquid. There is a problem that the crushed material passes through the liquefied wall and jumps out of the casing (20).

  As described above, the casing (20) is provided with the aluminum titanate ceramic layer (28a) excellent in heat resistance and low expansion characteristics. Thereby, the liquefaction of the wall body of the casing (20) due to the collision of the pulverized material is eliminated, and the pulverized material can be prevented from penetrating the wall body.

(Modification 6 of the first embodiment)
The power storage device of Modification 6 includes the first embodiment and Modifications 1 to 5 in that the marker (55), the marker position sensor (56), and the abnormality detection unit (57) for the rotating member are provided. It differs from the power storage device up to. Only the differences will be described below.

  As shown in FIG. 7, the marker (55) is attached at the same height over the entire circumference of the outer peripheral surface of the flywheel (3). Specifically, it is attached to the center of the outer peripheral surface of the flywheel (3). Two marker position sensors (56) are provided at an interval of 180 ° in the circumferential direction of the flywheel (3). Each marker position sensor (56) is fixed to the inner surface of the accommodating chamber (22) of the casing (20) so as to face the marker (55). These marker position sensors (56) are electrically connected to the abnormality detection unit (57) for the rotating member.

  Here, since the rotating member (1) rotates while being suspended from the motor shaft (31), when the rotating member (1) is not swung around, the rotating posture is constant, and the marker The position of (55) is not blurred. When the rotation of the rotating member (1) occurs, the posture of the rotating member (1) during rotation is disturbed and the position of the marker (55) is shifted. The marker position sensor (56) detects the blur amount of the marker (55) and inputs it to the abnormality detection unit (57) for the rotating member. Then, the abnormality detection unit (57) for the rotating member outputs an abnormality signal to the control unit (50) when the amount of blurring of the marker (55) exceeds a predetermined value. When the abnormal signal is input, the control unit (50) decelerates or stops the motor (30).

  According to the modified example 6, it is possible to determine the swinging of the rotating member (1) without viewing the rotating member (1). Also, if the rotating member (1) swings, the control unit (50) decelerates or stops the motor (30), so that the rotating member (1) does not collide with the inner wall of the casing (20). can do.

(Modification 7 of the first embodiment)
The power storage device of Modification 7 is different from the power storage device of Modification 6 in the position of the marker (55) and the arrangement of the marker position sensor (56). Only the differences will be described below.

  As shown in FIG. 8, the marker (55) is attached to the center of the lower end surface of the shaft portion (2) of the rotating member (1). The center of this lower end surface is the rotation center of the rotating member (1), and the position of the marker (55) is not displaced when the rotating member (1) is not swung around. However, when the whirling occurs in the rotating member (1), the position of the marker (55) is shifted. The blur amount of the marker (55) is detected by a marker position sensor (56) fixed to the bottom surface of the housing chamber (22) of the casing (20). Thus, even in the case of the modified example 7, the same effect as that of the modified example 6 can be obtained. In the case of the heat storage device of the first modification, the marker position sensor (56) may be provided in the hollow portion of the annular suppression neodymium magnet (12b). Thereby, the cyclic | annular suppression neodymium magnet (12b) and marker position sensor (56) can be arrange | positioned compactly.

(Modification 8 of the first embodiment)
The power storage device of the modification 8 includes the bubble tube level (60), the bubble position sensor (63), and the casing abnormality detection unit (64), from the first embodiment and the modification 1. This is different from the power storage device up to the seventh modification. Only the differences will be described below. In addition, in Fig.9 (a) and FIG.10 (a), the casing (20) of the modification 5 is illustrated as an example.

  As shown in FIG. 9 (a), on the upper surface of the base (27b) of the casing (20), a plurality of bubble-pipe levels (with a space in the circumferential direction of the body (27a) of the casing (20) ( 60) is installed. Liquid and bubbles (62) are sealed in the transparent bubble tube (61) of the bubble tube level (60). Also, four marked lines are marked on the outer peripheral surface of the bubble tube (61). If the bubble (62) is located between the two marked lines on both sides, the surface on which the bubble tube level (60) is installed is horizontal.

  The upper surface of the base (27b) of the casing (20) is formed along the direction orthogonal to the axial direction of the body (27a) of the casing (20). Each bubble tube level (60) is installed such that the axis of the bubble tube (61) is oriented sideways. Therefore, if the bubble (62) of the bubble tube (61) is located between the two marked lines, the upper surface of the base (27b) of the casing (20) is horizontal, and the body (27a ), The axial direction coincides with the vertical direction.

  As shown in FIG. 9 (b), in the casing (20), the bubble position is located so as to face the outside of each marked line marked on the bubble pipe (61) of each bubble pipe type level (60). The sensor (63) is fixed. The bubble position sensor (63) outputs the position information of the bubble (62) to the abnormality detection unit (64) for the casing. When the abnormality detection unit for casing (64) detects that the bubble (62) is located outside the marked line based on the position information of the bubble position sensor (63), the abnormality detection unit for casing (64 ) Outputs an abnormal signal to the control unit (50). The control unit (50) displays to the outside that the casing (20) is tilted. In this way, it is possible to determine that the casing (20) is installed tilted without visually observing the bubble tube level (60). As shown in FIG. 10 (a), the bubble tube level (60) is installed on the side surface of the base (27b) of the casing (20) so that the axis of the bubble tube (61) is vertical. May be. In this case, as shown in FIG. 10 (b), only one bubble position sensor (63) corresponding to each bubble tube level (60) is required, so the cost of the power storage device can be reduced. .

<< Second Embodiment >>
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 11, the power system (70) according to the second embodiment of the present invention includes a plurality of power storage devices (10) and a system control unit (75). The system control unit (75) includes an inverter circuit, a power control circuit, a microcomputer control circuit, and a threshold circuit. The power storage device includes the first embodiment described above and any one of the power storage devices from Modification 1 to Modification 8. A plurality of power storage devices are electrically connected to each other.

  When the system control unit (75) causes all the power storage devices to perform a discharging operation, the system controller (75) changes the output amount of the electrical energy of all the power storage devices in the same cycle, and the change over time in the output amount of the power storage devices becomes inconsistent Thus, a phase difference is provided. The result is shown in FIG. Thus, by performing operation control of a plurality of power storage devices, electric energy can be efficiently extracted from the plurality of power storage devices.

(Method for producing aluminum titanate-based sintered body)
Next, a method for producing an aluminum titanate sintered body will be described. First, after describing the manufacturing method in the case of including the step of mixing Ti-containing material, Al-containing material, Li-containing material, and Mg-containing material, the step of not using the above-mentioned Mg-containing material, that is, the Ti-containing material, A manufacturing method (hereinafter, also referred to as a modification of the manufacturing method) in the case of including a step of mixing the Al-containing material and the Li-containing material will be described.

(material)
(Ti-containing material)
The Ti-containing material used in the present invention is not particularly limited as long as it contains titanium and can synthesize an aluminum titanate-based sintered body by firing. Titanium oxide powder is preferred.

  As the titanium oxide, anatase type and / or rutile type titanium oxide can be used. Specifically, a rutile type titanium oxide produced by a chlorine method and an anatase type titanium oxide produced by a sulfuric acid method can be used.

  Furthermore, as the Ti-containing material, a material that is guided to titanium oxide by firing in air can also be used. Examples of such materials include titanium salts, titanium alkoxides, titanium hydroxide, titanium nitride, titanium sulfide, and titanium metal.

(Al-containing material)
The Al-containing material used in the present invention is not particularly limited as long as it contains aluminum and can synthesize an aluminum titanate-based sintered body by firing. Alumina (aluminum oxide) powder is preferred. Examples of the crystal type of alumina include γ-type, δ-type, θ-type, and α-type, and may be indefinite (amorphous). α-type alumina is preferably used.

  As the Al-containing material, a powder of a material that is guided to alumina by firing in air can also be used. Examples of such a material include aluminum salts, aluminum alkoxides, aluminum hydroxide, and metal aluminum.

  When anatase type or rutile type titanium oxide is used as the Ti-containing material and easy-sintering alumina α-type is used as the Al-containing material, the reactivity of both components is good. Aluminum oxide can be formed.

  The mixing ratio of the Ti-containing material and the Al-containing material is 75 to 25 parts by weight with respect to 25 to 75 parts by weight of the Ti-containing material based on 100 parts by weight of the total of the Ti-containing material and the Al-containing material. Weight part. Preferably, 70 to 30 parts by weight of the Al-containing material with respect to 30 to 70 parts by weight of the Ti-containing material, more preferably 60 to 40 parts by weight of the Al-containing material with respect to 40 to 60 parts by weight of the Ti-containing material. is there.

In addition, the weight part of Ti-containing material is converted into titanium oxide (TiO ₂ ), and the weight part of Al-containing material is converted into alumina (Al ₂ O ₃ ). That is, the amount of Ti-containing material is calculated based on the weight after it is converted to titanium oxide. The amount of the Al-containing material is calculated based on the weight after it is converted to alumina.

  When the blending ratio of the Al-containing material is too small (when the blending ratio of the Ti-containing material is too large), the mechanical strength may be lowered and the thermal stability may be deteriorated.

  When the blending ratio of the Al-containing material is too large (when the blending ratio of the Ti-containing material is too small), the mechanical strength increases, but the linear expansion coefficient may increase.

(Li-containing material)
Examples of the Li-containing material used in the present invention include petalite, spodumene, lithium carbonate, and lithium oxide. A material containing Li and Al is preferred. A material containing Li and Al and Si (for example, a silicate containing Li and Al) is more preferable. When the Li-containing material in the form of silicate is used, when an aluminum titanate-based fired body is formed by firing, a part of Si in the Li-containing material is dissolved in the crystal lattice and is replaced with Al. Since Si has a smaller ionic radius than Al, the bond distance with surrounding oxygen atoms is short, and the lattice constant is smaller than that of pure aluminum titanate. As a result, it is considered that the obtained sintered body has a stabilized crystal structure and improved mechanical strength, and further exhibits extremely high thermal stability, thus greatly improving the fire resistance.

  The content of the Li-containing material is preferably 1 to 10 parts by weight and more preferably 3 to 6 parts by weight with respect to a total of 100 parts by weight of the Ti-containing material and the Al-containing material. Most preferably, it is 4 to 5 parts by weight. By adjusting the content of the Li-containing material within an appropriate range, an aluminum titanate-based sintered body having a thermal expansion coefficient closer to zero, that is, a smaller volume change due to heat, can be obtained.

  When the content of the Li-containing material is too small, the thermal expansion coefficient of the aluminum titanate-based sintered body may not be sufficiently reduced. When it is too large, the heat resistance is lowered, and the aluminum titanate-based sintered body may be reduced. The mechanical strength of the sintered body may decrease. Furthermore, even if the content of the Li-containing material is too much or too little, the hysteresis may not be improved.

The content of the Li-containing material is determined as an amount in terms of petalite (Li (AlSi ₄ O ₁₀ )) with respect to a total of 100 parts by weight of the Ti-containing material in terms of titanium oxide and the Al-containing material in terms of alumina. And That is, when petalite is used as the Li-containing material, the amount is calculated as the content of the Li-containing material. When Li-containing material other than petalite is used as the Li-containing material, the weight of petalite (Li (AlSi ₄ O ₁₀ )) containing the same amount of Li as the Li-containing material is calculated as the content of the Li-containing material. .

  Moreover, when using the material containing Li and Al, the usage-amount of the material is calculated including both the usage-amount of Li containing material and the usage-amount of Al containing material. That is, when using a material containing Li and Al, the weight of the Li-containing material having the same amount of petalite as the amount of Li in the material and the weight of alumina containing the same amount of Al as the amount of Al in the material It is calculated that the Al-containing material is used.

(Mg-containing material)
The Mg-containing material used in the present invention is not particularly limited as long as it contains magnesium and can synthesize an aluminum titanate-based sintered body by firing. For example, in addition to the powder of magnesium oxide, a powder of a material that is guided to magnesium oxide by firing in air can be used.

  Examples of the material led to magnesium oxide by firing in air include magnesium salt, magnesium alkoxide, magnesium hydroxide, magnesium nitride, and magnesium metal.

As the Mg-containing material, a powder that also serves as an Al-containing material can be used. Examples of such powder include magnesium oxide spinel (MgAl ₂ O ₄ ) powder.

  In addition, when using the material containing Mg and Al, the usage-amount of the material is calculated including both the usage-amount of Mg-containing material and the usage-amount of Al-containing material. That is, when a material containing Mg and Al is used, the Mg-containing material having a weight of MgO corresponding to the amount of Mg in the material and the weight of alumina containing the same amount of Al as the amount of Al in the material. It is calculated that an Al-containing material is used.

  Moreover, when using the material containing Mg and Ti, the usage-amount of the material is calculated including both the usage-amount of Mg containing material and the usage-amount of Ti containing material. That is, when a material containing Mg and Ti is used, the weight of the Mg-containing material having the weight of MgO corresponding to the amount of Mg in the material and the weight of titanium oxide containing the same amount of Ti as the amount of Ti in the material It is calculated that a Ti-containing material is used.

Preferred Mg-containing materials are oxides having a spinel structure containing Mg, MgCO ₃ and MgO.

Examples of the oxide having a spinel structure containing Mg include MgAl ₂ O ₄ and MgTi ₂ O ₄ . As the oxide having such a spinel structure, a natural mineral may be used, or a spinel oxidation obtained by firing a raw material containing MgO and Al ₂ O ₃ , a raw material containing MgO and titanium oxide, or the like. You may use thing.

  The content of the Mg-containing material is preferably 1 to 10 parts by weight, more preferably 3 to 8 parts by weight with respect to 100 parts by weight of the total of the Ti-containing material and the Al-containing material. By containing the Mg-containing material in an appropriate range, the linear expansion coefficient is stabilized and the hysteresis is improved. Therefore, resistance to heat shock is increased.

  When the content of the Mg-containing material is too small, the heat resistance may be lowered and the strength may be lowered. Even when the content of the Mg-containing material is too large, the strength is lowered, the thermal expansibility is lowered, and decomposition may occur due to high heat.

  The content of the Mg-containing material is determined as the weight in terms of magnesium oxide (MgO) with respect to a total of 100 parts by weight of the Ti-containing material in terms of titanium oxide and the Al-containing material in terms of alumina.

  Each of the Ti-containing material, Al-containing material, Li-containing material, and Mg-containing material may be a separate material, and is a material that includes two or more metal components of Ti, Al, Li, and Mg. May be.

  This material is appropriately selected from those used as raw materials for various ceramics such as alumina ceramics, titania ceramics, magnesium oxide ceramics, aluminum titanate-based sintered bodies, magnesium titanate ceramics, spinel ceramics, aluminum magnesium titanate ceramics. The

Preferred material includes Al ₂ O _3, TiO _2, LiO, oxides such as MgO, two or more metal components such as the spinel structure containing _{MgAl 2 O 4, Al 2 TiO} 5, Mg and Ti There are compounds containing one or more metal components selected from the group consisting of complex oxides, Al, Ti and Mg (carbonates, nitrates, sulfates, etc.).

If necessary, inorganic materials other than the Ti-containing material, Al-containing material, Li-containing material, and Mg-containing material described above can be used as an additive. Such inorganic materials, SiO _2, iron oxide, zirconia, zircon, yttria, strontium, such as SiC and the like. One or more of these additives can be added in an amount of 15 parts by weight or less based on 100 parts by weight of the raw material mixture. Preferably it is 1-15 weight part, More preferably, it is 4-10 weight part, Most preferably, it is 3-6 weight part.

(Preparation of raw material mixture)
In the production method of the present invention, a mixture can be obtained by mixing raw materials of the Ti-containing material, Al-containing material, Mg-containing material, and Li-containing material.

  The raw material powders are thoroughly mixed and, if necessary, fired and then ground to an appropriate particle size. The mixing and pulverization of the raw materials are not particularly limited and are performed according to known methods.

  For example, it is performed using a ball mill, a medium stirring mill or the like. The degree of pulverization of the raw material mixture is not particularly limited. The average particle size is preferably 30 μm or less, particularly preferably 8 to 15 μm. This is preferably as small as possible as long as secondary particles are not formed.

  The raw material mixture can be baked as it is, but preferably it is preliminarily molded into a molded body as a final use form and then baked. When molding, a molding aid can be added to the raw material mixture. As molding aids, known ones such as binders, mold release agents, antifoaming agents, and peptizers can be used. As the binder, polyvinyl alcohol, microwax emulsion, methylcellulose, carboxymethylcellulose and the like are preferable. As the releasing agent, stearic acid emulsion and the like are preferable, as the antifoaming agent, n-octyl alcohol, octylphenoxyethanol and the like are preferable, and as the peptizer, diethylamine, triethylamine and the like are preferable. These are used to increase the dispersibility of each raw material when mixing the raw material mixture.

  The amount of the molding aid used is not particularly limited. With respect to a total of 100 parts by weight of each of the Al-containing material, Ti-containing material, Mg-containing material, and Li-containing material (raw material mixture) used as the raw material as oxides, It is preferable to do this.

  That is, 0.2 to 0.6 parts by weight of the binder, 0.2 to 0.7 parts by weight of the release agent, 0.5 to 1.5 parts by weight of the antifoaming agent, and 0. 5 to 1.5 parts by weight are used. The raw material mixture to which the molding aid is added is mixed, kneaded and molded.

  There are also no particular limitations on the method of forming the raw material mixture. For example, known molding methods such as press molding, sheet molding, cast molding, extrusion molding, injection molding, CIP molding, HIP molding, and recently 3D (three-dimensional) molding. May be adopted as appropriate.

  As a method for firing the formed body, a general ceramic firing method can be used.

  Firing is usually performed using a conventional firing furnace such as a tubular electric furnace, a box-type electric furnace, a tunnel furnace, a far-infrared furnace, a microwave heating furnace, a shaft furnace, a reflection furnace, a rotary furnace, or a roller hearth furnace. Firing may be performed batchwise or continuously. Moreover, you may carry out by a stationary type and may carry out by a fluid type.

  The atmosphere for firing can be air, vacuum (degree of vacuum of 1 Pa or less), nitrogen atmosphere, reducing atmosphere, inert atmosphere (argon, neon, helium, etc.). Preferably firing in the atmosphere.

  The firing temperature is usually about 1000 to 1750 ° C., preferably about 1200 to 1600 ° C.

  The firing time is not particularly limited, and may be fired until the sintering proceeds sufficiently, depending on the shape of the molded body, etc., and is usually maintained within the above temperature range for 1 to 10 hours. There are no particular limitations on the rate of temperature rise and the rate of temperature drop during firing, and conditions that do not cause cracks in the sintered body may be set as appropriate.

  In order to sufficiently remove the molding aids such as moisture and binder contained in the mixture, it is preferable to gradually increase the temperature without rapidly increasing the temperature. Moreover, before heating to the above-described firing temperature, if necessary, preferably in the temperature range of 700 to 1000 ° C., by carrying out temporary sintering at a moderate temperature rise of 10 to 30 hours, an aluminum titanate system The stress in the sintered body that causes the generation of cracks when the sintered body is formed can be relieved, and the generation of cracks in the sintered body can be suppressed to obtain a uniform sintered body.

  By the above-described method, an aluminum titanate-based sintered body (hereinafter also simply referred to as a sintered body) can be obtained. The aluminum titanate-based sintered body can be represented by a chemical formula, Ti—Al—Li—Mg—O-based (preferably, Ti—Al—Li—Mg—Si—O-based) crystal. The raw material of the sintered body of the present invention can contain a natural product as an Al-containing material, a Ti-containing material, an Mg-containing material, and a Li-containing material. Therefore, it can contain impurities. Moreover, elements other than Ti, Al, Li, Mg, and O can also be included. Therefore, the exact chemical formula of the sintered body of the present invention cannot be expressed accurately.

  In addition, as a formula of the main component in one preferred embodiment, for example, alumina is used as the Al-containing material, titanium oxide is used as the Ti-containing material, magnesium oxide is used as the Mg-containing material, and petalite is used as the Li-containing material. When used, the following equation is obtained.

(Al2O3) _a (TiO2) _b (MgO) _c (Li (AlSi4O10)) _d

  Here, the values of a, b, c, and d are determined by the amount of each material used.

  As described above, the sintered body of the present invention has heat resistance and high mechanical strength. Moreover, the sintered body of the present invention is excellent in durability and thermal shock resistance.

(Axis of rotation)
The rotating shaft used in the present invention can be formed from the aluminum titanate ceramic sintered body. After the powder is formed into a cylindrical shape or a rod shape, the rotating shaft is obtained by firing at the predetermined temperature described above.

(Modified example of manufacturing method of aluminum titanate sintered body)
Next, the modification of the manufacturing method of an aluminum titanate sintered compact is demonstrated. The modification of this manufacturing method includes the step of mixing the Ti-containing material, the Al-containing material, and the Li-containing material as described above. Only the differences from the manufacturing method described above will be described below.

As a preferable raw material of a modified example of this manufacturing method, a composite oxidation containing two or more kinds of metal components such as oxides such as Al ₂ O ₃ , TiO ₂ and LiO, and spinel structures containing Al ₂ TiO ₅ and Ti, etc. And compounds containing one or more metal components selected from the group consisting of Al, Ti (carbonates, nitrates, sulfates, etc.).

If necessary, inorganic materials other than the Ti-containing material, Al-containing material, and Li-containing material can be used as additives. Examples of such inorganic materials include MgO, SiO ₂ , iron oxide, zirconia, zircon, yttria, strontium, SiC, and the like. One or more of these additives can be added in an amount of 30 parts by weight or less based on 100 parts by weight of the raw material mixture. Preferably it is 1-25 weight part, More preferably, it is 1-15.

  By this modification of the manufacturing method, an aluminum titanate-based sintered body (hereinafter also simply referred to as a sintered body) can be obtained. The aluminum titanate-based sintered body can be represented by a chemical formula, a Ti—Al—Li—O-based (preferably a Ti—Al—Li—Si—O-based) crystal. The raw material of the sintered body can contain natural products as an Al-containing material, a Ti-containing material, and a Li-containing material. Therefore, it can contain impurities. Moreover, elements other than Ti, Al, Li, and O can also be included. Therefore, the exact chemical formula of the sintered body of the present invention cannot be expressed accurately.

  As a main component formula in one preferred embodiment, for example, when alumina is used as the Al-containing material, titanium oxide is used as the Ti-containing material, and petalite is used as the Li-containing material, the following formula is used. It becomes.

(Al2O3) _a (TiO2) _b (Li (AlSi4O10)) _c

  Here, the values of a, b, and c are determined by the amount of each material used.

  Similar to the above-described manufacturing method (including a step of mixing Ti-containing material, Al-containing material, Li-containing material, and Mg-containing material), the sintered body obtained by the modification of the manufacturing method is heat resistant. And high mechanical strength. Moreover, this sintered body is excellent in durability and thermal shock resistance. The rotating shaft used in the present invention can be formed from this sintered body. After the powder is formed into a cylindrical shape or a rod shape, the rotating shaft is obtained by firing at the predetermined temperature described above.

Hereinafter, the present invention will be described in more detail with reference to examples.
The present invention is not limited to the examples as long as the gist thereof is not exceeded.
The materials used in the following examples are as follows.

Example 1
30 parts by weight of titanium oxide (A-110, Sakai Chemical Co., Ltd.), 70 parts by weight of easily sintered alumina (AES-11, Sumitomo Chemical Co., Ltd.), 4 parts by weight of petalite, magnesium oxide (Ube Materials Co., Ltd.) )) 4 parts by weight, appropriate amount of warm water, 1.5 parts by weight of diethanolamine as a peptizer, 0.1 parts by weight of polyvinyl alcohol as an organic binder, and 0.5 parts by weight of polypropylene glycol as an antifoaming agent Got.
This slurry was dried to obtain a clinker. The clinker was pulverized with a ball mill for 24 hours and classified with a sieve. An aluminum titanate-based powder (raw material powder) having a sieve size of 80 to 100 μm and an average particle size x = 90 μm was obtained.
The obtained raw material powder was pressed at a molding pressure of 60 MPa to obtain a molded body of 50 mm × 100 mm × 10 mm. The molded body was fired at 1450 ° C. in the air and then allowed to cool to obtain an aluminum titanate-based sintered body.

(Example 2)
Instead of magnesium oxide (Ube Materials Co., Ltd.), except that 4 parts by weight of magnesium oxide (Kamishima Chemical Industry Co., Ltd.) was used, it was molded and fired in the same manner as in Example 1 to form an aluminum titanate-based fired product. A ligature was obtained.

Example 3
40 parts by weight of titanium oxide (A-110, Sakai Chemical Co., Ltd.), 60 parts by weight of easily sintered alumina (AES-11, Sumitomo Chemical Co., Ltd.), 4 parts by weight of petalite, magnesium oxide (Kanjima Chemical) Except that 4 parts by weight of Kogyo Co., Ltd. was mixed, it was molded and fired in the same manner as in Example 1 to obtain an aluminum titanate-based sintered body.

Example 4
25 parts by weight of titanium oxide (A-110, Sakai Chemical Co., Ltd.), 50 parts by weight of easily sintered alumina (AES-11, Sumitomo Chemical Co., Ltd.), 250 parts by weight of fused silica and 4 parts by weight of petalite An aluminum titanate-based sintered body was obtained by molding and firing in the same manner as in Example 1 except that 0.4 part by weight of yttria was mixed.

(Example 5)
23 parts by weight of titanium oxide (A-110, Sakai Chemical Co., Ltd.), 60 parts by weight of easily sintered alumina (AES-11, Sumitomo Chemical Co., Ltd.), 170 parts by weight of fused silica and 4 parts by weight of petalite An aluminum titanate-based sintered body was obtained by molding and firing in the same manner as in Example 1 except that 0.4 part by weight of yttria was mixed.

(Other embodiments)
In the present embodiment, the flywheel (3) is formed in a disk shape having a constant axial thickness as a whole. However, the present invention is not limited to this. For example, as shown in FIG. ) May increase in the axial direction from the radially outer side to the inner side. This flywheel (3) may be formed by bonding two members up and down, or may be formed by adjusting the thickness of the roving carbon fiber bundle. By forming in this way, the rotational resistance of the flywheel (3) can be reduced, and the flywheel (3) can be rotated at a higher speed. As a result, the power storage efficiency of the power storage device can be improved.

  In the present embodiment, the flywheel (3) is formed of a carbon fiber material. However, the present invention is not limited to this, and the flywheel (3) may be formed of ceramics. Here, the ceramic is preferably an aluminum titanate ceramic. If it carries out like this, the whole rotation member (1) can be formed with an aluminum titanate ceramic, and efficiency improvement of formation of a rotation member (1) can be achieved. Further, the efficiency of the formation of the rotating member (1) can be further increased by integrally forming the shaft portion (2) of the rotating member (1) and the flywheel (3).

  In the present embodiment, the shaft portion (2) of the rotating member (1) is formed of an aluminum titanate ceramic, but is not limited thereto, and may be formed of carbon fiber or fiber reinforced plastic. At this time, the flywheel (3) of the rotating member (1) may be formed of ceramics, carbon fiber or fiber reinforced plastic, or may be formed of a material other than these. At this time, the shaft portion (2) and the flywheel (3) may be made of the same material or different materials.

  Here, the fiber reinforced plastic is preferably glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP).

  In glass fiber reinforced plastics, when glass fiber is processed into a plate or rod shape, be sure to use epoxy resin, polypropylene (PP), polyethylene (PE), polystyrene (PS), ABS resin, polyethylene terephthalate (PET), etc. It hardens | cures using a curable resin or a thermoplastic resin, However, Glass fiber (General specific gravity is 2.16-2.55) by mixing fertile barium sulfate (specific gravity 4.5) with these resin. The specific gravity can be increased more than the molded body of only the above. By using this material for the shaft part (2) and the flywheel (3) of the rotating member (1), the specific gravity can be increased as compared with the glass fiber, so that the efficiency can be further increased. The blending ratio of the resin and barium sulfate is preferably 30 to 90% by weight and more preferably 45 to 75% with respect to the resin.

  In the present embodiment, the power storage device is used for a small-scale office or a general household. However, the present invention is not limited to this. For example, an accelerator (accelerator for cancer particle beam therapy, etc.) uses a large amount of power. Therefore, it may be used for this accelerator. Further, it can be used in combination with solar power generation, wind power generation, nuclear power generation, gas turbine, steam turbine, or the like, or can be used as a power generation and power storage device for home appliances, electric vehicles and the like. It can also be used in general housing, apartment houses such as condominiums, tenant buildings, convenience stores, department stores, various factories, research laboratories, chemical companies, plants, and the like. Even in such a case, the same effect as in the present embodiment can be obtained.

  In the present embodiment, the flywheel (3) is used as the inertial body, but the invention is not limited to this. For example, the section perpendicular to the axis may be polygonal or elliptical. Even in this case, the same effect as in the present embodiment can be obtained.

  In the present embodiment, the rotating member (1) includes the shaft portion (2) and the plurality of flywheels (3). However, the rotating member (1) is only an inertial body (3a). It may be configured. For example, the inertial body (3a) may be formed in a cylindrical shape like the power storage device (10e) shown in FIG. The shape of the inertial body (3a) is an example.

  Here, when the rotating member (1) is configured only by the inertial body (3a), the inertial body (3a) is directly connected to the motor shaft (31) of the motor (30). In the power storage device (10e) shown in FIG. 14, the motor shaft is constituted by a male screw portion (38a) at the lower end portion of the motor shaft (31) and a female screw portion (38b) formed in a recess in the upper surface of the inertial body (3a). (31) and inertial body (3a) are fastened. At this time, it is preferable that the male thread part (38a) and the female thread part (38b) are threaded in the direction opposite to the rotation direction of the inertial body (3a). By doing so, it is possible to prevent the male screw part (38a) and the female screw part (38b) from being loosened by the rotation of the inertial body (3a).

  Further, the inertial body (3a) of the power storage device (10e) shown in FIG. 14 is formed of fiber reinforced plastic. Here, the fiber reinforced plastic is preferably glass fiber reinforced plastic (GFRP) or carbon fiber reinforced plastic (CFRP). These plastics are excellent in workability because they are easy to perform pultrusion molding. In addition, these plastics, unlike magnetic materials such as ferrous and non-ferrous metals, do not cause eddy current loss when the inertial body (3a) rotates.

  In the present embodiment, both the storage chamber (22) of the rotating member (1) and the motor chamber (21) of the motor (30) are configured to be kept in a vacuum state, but the present invention is not limited to this. Only the storage chamber (22) may be kept in a vacuum state. As in the power storage device (10e) shown in FIG. 14, the motor (30) may be exposed outside the casing (80).

  In the power storage device (10e) shown in FIG. 14, the wall of the casing (80) includes a ceramic layer (80a), a carbon-based felt layer (80b), and a stainless or aluminum-based metal layer (80c). ) Is a multilayer structure laminated from the inside to the outside of the casing (80). Here, a carbon-based chopped fiber layer may be used instead of the carbon-based felt layer.

  Further, in the power storage device (10e) shown in FIG. 14, the inertial body (3a) is formed in a cylindrical shape. However, the inertial body (3f) is not limited to this. The lower end surface of 3a) may be formed of a convex curved surface (81). In this case, the bottom surface on the inner surface side of the casing (80) of the power storage device (10f) shown in FIG. 15 is a concave curved surface (82), and the center of the convex curved surface (81) of the inertial body (3a). The inertial body (3a) is rotatably supported by bringing the portion into contact with the central portion of the concave curved surface (82) of the casing (80). Thereby, the whirling at the time of rotation of an inertial body (3a) can be eliminated.

  Here, the curvature of the curved surface (82) of the casing (80) is set to be equal to or greater than the curvature of the curved surface (81) of the inertial body (3a). Thereby, the inertial body (3a) can be easily rotated and supported.

  In addition, the power storage device (10f) illustrated in FIG. 15 includes a suppression unit (87) that suppresses swinging of the inertial body (3a) during rotation. The suppression unit (87) includes first and second neodymium magnets (85, 86) as first and second permanent magnets. The first neodymium magnet (85) is attached to the lower end of the inertial body (3a). The second neodymium magnet (86) is formed in an annular shape. The annular second neodymium magnet (86) is embedded in the curved surface (82) of the casing (80).

  The first and second neodymium magnets (85, 86) are arranged by arranging them so that the axis of the annular second neodymium magnet (86) substantially coincides with the axis of the inertial body (3a). The repulsive force between them can be exerted around the axis of the inertial body (3a), and the swinging of the inertial body (3a) during rotation can be further eliminated.

  In the power storage device (10f) shown in FIG. 15, the curved surface (81) of the inertial body (3a) and the curved surface (82) of the casing (80) are made of cemented carbide non-ferrous metal (for example, industrial diamond) (88 ), Wear friction during rotation of the inertial body (3a) can be suppressed.

  Further, unlike the power storage device (10f) shown in FIG. 15, the lower end of the inertial body (3a) is not in contact with the curved surface (82) of the casing (80) in the power storage device (10g) shown in FIG. . An annular second neodymium magnet (86) is attached so as to protrude from the curved surface (82). As described above, since the inertial body (3a) and the casing (80) are not in contact with each other, the super hard nonferrous metal of the power storage device (10f) in FIG. 15 is not attached. In addition, the axis of the annular second neodymium magnet (86) and the axis of the inertial body (3a) are substantially coincident. Even with such a configuration, it is possible to eliminate the whirling during rotation of the inertial body (3a).

  In the power storage device (10e, 10f, 10g) shown in FIGS. 14, 15, and 16, the marker (55), marker position sensor (56), and rotating member shown in the sixth and seventh modifications of the first embodiment are used. If the abnormality detection unit (57) is provided, the rotating member (1a) can be prevented from colliding with the inner wall of the casing (80). Further, if the bubble tube level (60), the bubble position sensor (63), and the abnormality detecting section (64) for the casing shown in the modified example 8 of the first embodiment are provided, the casing (80) Can be prevented from being inclined.

  The power storage device (10) of the power system (70) according to the second embodiment includes the power storage devices (10a to 10d) of the first embodiment and the first modification to the eighth modification, FIG. 14, FIG. 15, and FIG. 16 may be at least one of the power storage devices (10e, 10f, 10g) shown in FIG.

  In addition, embodiment mentioned above is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

  As described above, the present invention is useful for a power storage device that stores electrical energy as rotational energy of a rotating member.

1, 1a Rotating member 2 Shaft 3 Flywheel (Inertial body)
4 Shaft part 5 Joint part 10, 10a to 10f Power storage device 11 Suppressing part 20 Casing 21 Motor room 22 Storage room 30 Motor 40 Vacuum pump 50 Control part

Claims (14)

A rotating member (1, 1a) and a motor (30);
A power storage device that stores electrical energy input to the motor (30) by converting it into rotational energy of the rotating member (1, 1a),
The rotating member (1, 1a) is at least partially formed of ceramics, carbon fiber, or fiber reinforced plastic, and is suspended from a motor shaft (31) of the motor (30). apparatus.   The rotating member (1) is suspended from an inertial body (3) and a motor shaft (31) of the motor (30) in a state where the inertial body (3) is fixed, and ceramics, carbon fiber, or fiber The power storage device according to claim 1, further comprising a shaft portion (2) containing reinforced plastic.   The power storage device according to claim 2, wherein the inertial body (3) of the rotating member (1) is made of ceramics, carbon fiber, or fiber reinforced plastic.   A first permanent magnet (12a) fixed to the lower end of the shaft (2) of the rotating member (1), and a first embedded in the bottom surface of the storage chamber (22) containing the rotating member (1). Of the rotating member (1) by a magnetic force acting between the first and second permanent magnets (12a, 12b) arranged to be in non-contact with each other. The power storage device according to any one of claims 1 to 3, further comprising a suppressing unit (11) that suppresses the whirling during rotation. Comprising a joint part (5) having a plurality of magnets stacked vertically and adsorbed to each other;
The motor shaft (31) of the motor (30) is fixed to the uppermost magnet,
The shaft portion (2) of the rotating member (1) is fixed by sandwiching a flange portion (4) formed at the upper end portion of the shaft portion (2) between the adjacent magnets. The power storage device according to any one of claims 1 to 4, wherein the power storage device is characterized.   The electrical storage device according to any one of claims 1 to 5, wherein the ceramics of the rotating member (1, 1a) are aluminum titanate ceramics. A casing (20, 80) for accommodating the rotating member (1, 1a);
The ceramic of the rotating member (1, 1a) is a sintered body of an aluminum titanate ceramic, and when a load exceeding a limit value is applied to the rotating member (1, 1a), the rotating member (1, 1a) The power storage device according to any one of claims 1 to 6, wherein the sintered body of aluminum titanate-based ceramics is pulverized in the casing (20, 80). .   The power storage device according to claim 7, wherein the wall body facing the storage chamber (22, 90) of the casing (20, 80) contains an aluminum titanate ceramic.   The rotating member (1a) includes an inertial body (3a) suspended directly from a motor shaft (31) of the motor (30), and the inertial body (3a) is ceramic, carbon fiber, or fiber reinforced. The power storage device according to claim 1, wherein the power storage device is made of plastic. A casing (80) containing the inertial body (3a);
The lower end surface of the inertial body (3a) is formed of a convex curved surface (81),
The casing (80) is formed with a concave curved surface (82) whose inner surface facing the curved surface (81) of the inertial body (3a),
The power storage device according to claim 9, wherein a center portion of the curved surface (81) of the inertial body (3a) and a center portion of the curved surface (82) of the casing (80) are in contact with each other. .   The 1st permanent magnet (85) fixed to the lower end part of the said rotation member (1a), and the 2nd permanent magnet (86) embedded in the bottom face of the storage chamber (90) which accommodated the said rotation member (1a). ), And the magnetic force acting between the first and second permanent magnets (85, 86) arranged so as to be in non-contact with each other, The power storage device according to claim 9 or 10, further comprising a suppression unit (87) that suppresses. A marker (55) attached to the rotation center of the rotating member (1, 1a) or attached to the outer peripheral surface of the rotating member (1, 1a) at a constant height along the circumferential direction;
A marker position sensor (56) for detecting a blur amount at the position of the marker (55);
The abnormality detection unit (57) for a rotating member that outputs an abnormality signal when the amount of blur detected by the marker position sensor (56) exceeds a predetermined value is provided. The electrical storage apparatus as described in any one. A casing (20, 80) containing the rotating member (1, 1a);
A bubble tube level (60) fixed to the casing (20, 80);
A bubble position sensor (63) for reading the position of the bubble (62) of the bubble tube level (60);
An anomaly detector (64) for the casing that outputs an anomaly signal when it is detected that the horizontality or verticality of the casing (20, 80) is out of a predetermined range based on the position of the bubble (62) read by the position sensor. When,
The power storage device according to claim 1, comprising: A plurality of power storage devices (10) according to any one of claims 1 to 13;
When all the power storage devices (10) perform a discharging operation for converting the rotational energy stored in the rotating member (1, 1a) of the power storage device (10) into electric energy and outputting the electric energy, And (10) a system control unit (75) that changes the output amount of electrical energy in the same cycle and provides a phase difference so that the change over time of the output amount of the power storage device (10) becomes inconsistent. Power system characterized by