JP2019121418A - Power supply system and radar system - Google Patents

Abstract

To provide a power supply system capable of achieving reduction in manufacturing cost by simplifying its configuration.SOLUTION: The power supply system includes: a fuel cell for generating electric power by a chemical reaction of hydrogen; a casing for storing the fuel cell; a plurality of hydrogen tanks disposed to surround the casing and generating a buoyancy against water by charging hydrogen.SELECTED DRAWING: Figure 5

Description

  Embodiments of the present invention relate to a power supply system and a radar system.

  As buoys and light marks installed on the sea, for example, those emitting light by electric power supplied from a battery and transmitting radio waves are known. This type of buoy or lamppost comprises, for example, a container floating in water, a battery accommodated in the container, an oscillating device, and the like.

Patent document 1: JP-A-2001-278183

  In the above-described buoys and light marks, containers for floating them in water become large according to the weight of the battery and the transmitter. In particular, the weight of the battery increases if the buoy or lamppost is operated for a long time. As a result, the size of the container for generating the buoyancy increases, resulting in an increase in manufacturing cost and difficulty in handling.

  The present invention has been made in view of the above circumstances, and its object is to reduce the manufacturing cost by simplifying the device configuration.

  The power supply system according to the present embodiment is arranged to surround a fuel cell that generates electricity by causing a chemical reaction of hydrogen, a fuel cell storage case, and a casing, and is filled with hydrogen to provide buoyancy against water. And a plurality of hydrogen tanks to be generated.

It is a perspective view of a radar system provided with a power supply system concerning this embodiment. It is a sectional view of a radar system. It is a figure which shows schematic structure of a radar system. It is a top view of a radar system. It is a figure which shows the use aspect of a radar system. It is a figure which shows the gravity center of a radar system. It is a figure which shows the gravity center of a power supply system. It is a figure which shows the floating mind of a radar system.

  Hereinafter, a radar system according to the present embodiment will be described with reference to the drawings. In the description, an orthogonal coordinate system consisting of mutually orthogonal X, Y, and Z axes is used.

  FIG. 1 is a perspective view of a radar system 1 provided with a power supply system 100 according to the present embodiment. The radar system 1 is an isolated radar system that does not require external power supply. The radar system 1 includes a power supply system 100 and a radar device 200.

  As shown in FIG. 1, the power supply system 100 includes a fuel cell unit 10, six hydrogen tanks 20, and four hydrogen storage units 30. The fuel cell unit 10 generates electric power using hydrogen supplied from the hydrogen tank 20 or the hydrogen storage unit 30, and supplies the generated electric power to the radar device 200.

  FIG. 2 is a cross-sectional view of the radar system 1. FIG. 3 is a view showing a schematic configuration of the radar system 1. As shown in FIGS. 2 and 3, the fuel cell unit 10 includes a casing 11, a fuel cell 12, pipes 13 and 14, and a control device 18.

  The casing 11 is a substantially cylindrical casing having an open upper surface whose longitudinal direction is the Z-axis direction, and the opening of the upper surface is closed by an octagonal plate-like lid 11 a. The casing 11 has a pressure resistant structure made of glass fiber.

  The fuel cell 12 is housed inside the casing 11, and generates electricity by causing a chemical reaction between hydrogen and oxygen in the air.

  The pressure sensor 15 and the check valve 16 are provided in the pipe 13. The pipe 13 includes a pipe 13 a and a plurality of pipes 13 b branched from the pipe 13 a. The pipe 13 a is connected to the fuel cell 12. The plurality of pipes 13 b are respectively connected to the hydrogen tank 20.

  The pipe 14 is provided with a check valve 16 and a solenoid valve 17. The pipe 14 includes a pipe 14 a and a plurality of pipes 14 b branched from the pipe 14 a. The pipe 14 a is connected to the fuel cell 12. The plurality of pipes 14 b are respectively connected to the hydrogen storage unit 30.

  The pressure sensor 15 is provided in the pipe 13a. The pressure sensor 15 measures the pressure inside the pipe 13a, and outputs a signal of a value according to the measurement result.

  The check valve 16 is provided in each of the pipe 13 b and the pipe 14 b. The check valve 16 only allows passage of gas from the hydrogen tank 20 or hydrogen storage unit 30 to the fuel cell 12.

  The solenoid valve 17 is provided in the pipe 14 b. The solenoid valve 17 is a normally closed solenoid valve and opens when it is applied.

  The controller 18 receives a signal output from the pressure sensor 15. Then, the control device 18 controls the solenoid valve 17 based on the received signal.

  The controller 18 operates with the power supplied from the fuel cell 12.

  As shown in FIG. 1, six hydrogen tanks 20 and four hydrogen storage units 30 are disposed along the side surface of the casing 11.

  FIG. 4 is a plan view of the radar system 1. As shown in FIG. 4, the hydrogen tank 20 is detachably fixed to the side surface of the casing 11 by a fixing device 11 b provided on the side surface of the casing 11.

  The hydrogen tank 20 is a substantially cylindrical container made of glass fiber and having the longitudinal direction as the Z-axis direction. The length of the hydrogen tank 20 in the Z-axis direction is equal to or less than half of the length of the casing 11 in the Z-axis direction, and the radius of the hydrogen tank 20 is substantially the same as the radius of the casing 11.

  The inside of the hydrogen tank 20 is filled with compressed hydrogen, and the pressure inside the hydrogen tank 20 is about 70 MPa. The specific gravity of the hydrogen tank 20 filled with hydrogen is smaller than the specific gravity of water.

  The hydrogen tank 20 includes a connecting portion 21 connected to the pipe 13 b. The hydrogen filled in the hydrogen tank 20 is supplied to the fuel cell 12 via the pipe 13 and the connection portion 21.

  As shown in FIG. 1, six hydrogen tanks 20 provided in the power supply system 100 are equally spaced to surround the casing 11 of the fuel cell unit 10.

  The length of the hydrogen tank 20 in the Z-axis direction is equal to or less than half the length of the casing 11 in the Z-axis direction. The hydrogen tank 20 is fixed to the upper end of the casing 11.

  As shown in FIG. 1, the four hydrogen storage units 30 are arranged at equal intervals so as to surround the casing 11.

  The hydrogen storage unit 30 has a substantially cylindrical shape with the longitudinal direction as the Z-axis direction. The length of the hydrogen storage portion 30 in the Z-axis direction is half or less of the length of the casing 11 in the Z-axis direction, and the radius of the hydrogen storage portion 30 is substantially the same as the radius of the casing 11. The hydrogen storage unit 30 has a housing provided with a pressure resistant structure made of glass fiber, and stores hydrogen using a Ni-based hydrogen storage alloy inside the housing.

  The hydrogen stored in the hydrogen storage unit 30 is supplied to the fuel cell 12 through a pipe 14 connected to the hydrogen storage unit 30.

  The hydrogen storage unit 30 is fixed to the lower end of the casing 11.

  The radar device 200 is provided on the fuel cell unit 10. The radar device 200 includes a dome 201 and a radar transmitter 202 housed in the dome 201. The radar transmitter 202 is a radar array and transmits a radar transmission wave L.

  Next, the operation of the radar system 1 will be described.

  As shown in FIG. 2, the radar system 1 is used with the hydrogen tank 20 and the hydrogen storage unit 30 attached to the casing 11 of the fuel cell unit 10. As a premise, the solenoid valve 17 is assumed to be closed.

  As shown in FIG. 4, the hydrogen tank 20 is attached to the fixture 11 b of the casing 11. The connection portion 21 of the hydrogen tank 20 is connected to the pipe 13 b. The hydrogen filled in the hydrogen tank 20 is supplied to the fuel cell 12 through the pipe 13 and the connection part 21. The fuel cell 12 generates electricity by causing a chemical reaction between the supplied hydrogen and the oxygen in the taken-in air.

  The hydrogen tank 20 that has finished using the hydrogen that has been filled is replaced with a new hydrogen tank 20 that is filled with hydrogen. Replacement of the hydrogen tank 20 is performed after the radar system 1 is collected on the ship using a ship.

  If the hydrogen stored in the six hydrogen tanks 20 is consumed before being replaced with a new hydrogen tank 20 and power generation by the fuel cell 12 becomes difficult, the fuel cell 12 receives The stored hydrogen and oxygen in the taken-in air are chemically reacted to generate electricity.

  The pressure sensor 15 starts operation by the power generated by the fuel cell 12. The pressure sensor 15 measures the pressure inside the pipe 13 a and transmits information of the measured pressure to the control device 18. The pressure inside the pipe 13a decreases as the remaining amount of hydrogen in the hydrogen tank 20 decreases.

  The controller 18 starts operation by the electric power generated by the fuel cell 12. The controller 18 controls the solenoid valve 17 based on the information received from the pressure sensor 15. For example, when the pressure inside the pipe 13 a received from the pressure sensor 15 becomes equal to or less than a predetermined pressure, the control device 18 applies the pressure to the solenoid valve 17. The solenoid valve 17 is applied by the control device 18 and is opened.

  The hydrogen stored in the hydrogen storage unit 30 is supplied to the fuel cell 12 through the pipe 14 when the solenoid valve 17 is opened.

  The electric power generated by the fuel cell 12 is supplied to the radar transmitter 202 of the radar device 200. The radar transmitter 202 supplied with power generates a transmission signal, and transmits the generated transmission signal as a radar transmission wave L.

  FIG. 5 is a view showing a use mode of the radar system 1. As shown in FIG. 5, the radar transmission wave L transmitted by the radar system 1 spreads in the form of radiation and strikes a flying object F passing near the radar system 1 to become a reflected wave R. Although not shown, it is possible to detect an aircraft F passing near the radar system 1 by receiving the reflected wave R with a large receiver installed at a position distant from the radar system 1. .

  The radar system 1 operating as described above is used in a floating state on the water surface S. Then, a large receiver that receives the reflected wave R is installed on the ground.

  The hydrogen tank 20 filled with hydrogen has buoyancy because it has a specific gravity smaller than that of water. Therefore, the hydrogen tank 20 filled with hydrogen functions as a float, and the radar system 1 floats on the water surface S.

  The overturning difficulty of an object floating on water changes depending on the center of gravity acting on the object and the position of the floating center (center of buoyancy). When the downward force acting line of gravity acting on the center of gravity of the object and the upward acting force acting line on the floating center of the object are on the same axis, the gravity and the buoyant moment of the object are not generated, and the object is stabilized. The floating center of an object floating on water is the center of the volume below the surface of the object.

  In general, when an object floating on water inclines due to a wave or the like, the height (metacenter height) of the point connecting the center line of the object floating on water and the working line of the floating center of the object is the center of gravity of the object When it becomes lower than the height of, the moment of gravity and buoyancy acts further in the direction of tilting the object, and the object is overturned.

  When the center of gravity of the object is located on the side closer to the tilt than the floating center of the object, the metacenter height is lower than the height of the center of gravity of the object.

  For example, when an object floating on water inclines in one direction, the center of gravity of the object moves in the inclination direction. At the same time, the tilting direction side of the object sinks deeper, and the volume under the water surface on the tilting direction side of the object increases. Therefore, the floating center of the object also moves toward the tilt direction.

  The amount of movement of the center of gravity of an object moving toward the tilt direction is larger as the position of the center of gravity of the object is higher, and smaller as the position of the center of gravity of the object is lower. Therefore, when the object floating on the water stably inclines, the line of downward gravity acting on the center of gravity of the object and the upward buoyancy acting on the floating center of the object may not be on the same axis. As a result, in the object, moments of gravity and buoyancy of the object are generated.

  When the floating center of the object is positioned on the side of the tilt direction with respect to the center of gravity of the object, a moment (restoring force) in the direction opposite to the tilt direction is generated, and the object tries to return to the pre-tilt state. Then, when the gravity and buoyancy lines of action of the object are on the same axis, the object becomes stable.

  In addition, when the center of gravity of the object is positioned on the side of the inclination direction relative to the floating center of the object, a moment in the inclined direction is generated to further incline the object. And the object overturns.

  The distance between the center of gravity of the object and the floating center before the object tilts is used as a measure of the recovery force. For example, when the center of gravity of the object is at a position higher than the floating center of the object, the shorter the distance between the center of gravity of the object and the floating center, the greater the recovery force, and the more stable it returns to a stable state. Generally, the lower the position of the center of gravity of an object, the greater the recovery power.

  FIG. 6 is a diagram showing the center of gravity G of the radar system 1. As shown in FIG. 6, the center of gravity G of the radar system 1 is the center of gravity obtained by combining the center of gravity G1 of the power supply system 100 and the center of gravity G10 of the radar device 200. The radar device 200 is disposed on the top surface of the fuel cell unit 10 of the power supply system 100.

  The position of the center of gravity G of the radar system 1 changes depending on the position of the center of gravity G1 of the power supply system 100 and the mass ratio of the power supply system 100 to the radar apparatus 200 when the position of the center of gravity G10 of the radar device 200 is constant.

  FIG. 7 is a diagram showing the center of gravity G1 of the power supply system 100. As shown in FIG. The center of gravity G1 of the power supply system 100 is a center of gravity obtained by combining the center of gravity G2 of the fuel cell unit 10, the center of gravity G3 of the entire six hydrogen tanks 20, and the center of gravity G3 of the entire four hydrogen storage units 30.

  The position of the center of gravity G1 of the power supply system 100 changes depending on the mass ratio of the fuel cell unit 10, the entire six hydrogen tanks 20, the entire four hydrogen storage units 30, and the position of the respective centers of gravity.

  As shown in FIGS. 1 to 4, the six hydrogen tanks 20 and the four hydrogen storage units 30 of the power supply system 100 are equally spaced to surround the casing 11 of the fuel cell unit 10. In the vicinity of the + Z side end of the fuel cell unit 10, hydrogen is filled, and a hydrogen tank 20 having a specific gravity smaller than that of water is disposed. In the vicinity of the -Z side end of the fuel cell unit 10, a hydrogen storage unit 30 having a specific gravity greater than that of water is disposed.

  As shown in FIGS. 6 and 7, the center of gravity G2 of the fuel cell unit 10 is located on the central axis Q of the cylindrical casing 11 parallel to the Z-axis.

  Since the six hydrogen tanks 20 are arranged at equal intervals so as to surround the casing 11 along the side surface of the casing 11, the centers of gravity G3 of the entire six hydrogen tanks 20 are cylindrical casings parallel to the Z axis. It is located on the central axis Q of 11.

  The center of gravity G3 of all the six hydrogen tanks 20 and the center of gravity G2 of the fuel cell unit 10 are located on the same axis parallel to the Z axis. Further, the position of the center of gravity G3 of the entire six hydrogen tanks 20 in the Z-axis direction is located on the + Z side of the position of the center of gravity G2 of the fuel cell unit 10 in the Z-axis direction.

  The four hydrogen storage units 30 function as weights because they have a specific gravity greater than that of water. Since the four hydrogen storage units 30 are equally spaced to surround the casing 11 along the side surface of the casing 11, the centers of gravity G3 of all the four hydrogen storage units 30 have a cylindrical shape parallel to the Z axis. Located on the central axis Q of the casing 11 of FIG.

  The center of gravity G3 of all the four hydrogen storage units 30 and the center of gravity G2 of the fuel cell unit 10 are located on the same axis parallel to the Z axis. Further, the position of the center of gravity G3 of the four hydrogen storage units 30 in the Z-axis direction is located on the −Z side of the position of the center of gravity G2 of the fuel cell unit 10 in the Z-axis direction.

  That is, the center of gravity G2 of the fuel cell unit 10, the center of gravity G3 of the entire hydrogen tank 20, and the center of gravity G4 of the entire hydrogen storage unit 30 are on the same axis parallel to the Z axis. The position of the center of gravity G3 of the entire hydrogen tank 20 in the Z-axis direction is located on the + Z side of the position of the center of gravity G2 of the fuel cell unit 10 in the Z-axis direction. The position of the center of gravity G4 of the hydrogen storage unit 30 in the Z-axis direction is located on the −Z side of the position of the center of gravity G2 of the fuel cell unit 10 in the Z-axis direction.

  The center of gravity G1 of the power supply system 100 is a center of gravity obtained by combining the center of gravity G2 of the fuel cell unit 10, the center of gravity G3 of the entire six hydrogen tanks 20, and the center of gravity G3 of the entire four hydrogen storage units 30. The center of gravity G1 of the power supply system 100, the center of gravity G2 of the fuel cell unit 10, the center of gravity G3 of the entire six hydrogen tanks 20, and the center of gravity G3 of the entire four hydrogen storage units 30 are on the same axis parallel to the Z axis .

  The positions of the + Z side end of the hydrogen tank 20 and the + Z side end of the casing 11 in the Z-axis direction are substantially the same, and the −Z side end of the hydrogen tank 20 is the + Z side of the −Z side end of the fuel cell unit 10 Located in Therefore, the position of the center of gravity G3 of the entire six hydrogen tanks 20 in the Z-axis direction is located on the + Z side of the position of the center of gravity G2 of the fuel cell unit 10 in the Z-axis direction. The position of is biased to the + Z side.

  The + Z side end of the hydrogen storage unit 30 is located on the −Z side of the −Z side end of the hydrogen tank 20, and the −Z side end of the hydrogen storage unit 30 is more than the −Z side end of the fuel cell unit 10 Located on the Z side. Therefore, the position in the Z-axis direction of the center of gravity G3 of all the four hydrogen storage units 30 is located on the −Z side of the position in the Z-axis direction of the center of gravity G2 of the fuel cell unit 10 The axial position is biased to the -Z side.

  The position of the center of gravity G1 of the power supply system 100 in the Z-axis direction is on the + Z side of the position of the center of gravity G2 of the fuel cell unit 10 in the Z-axis direction by the balance of all six hydrogen tanks 20 and all four hydrogen storage units 30. Biasing is suppressed.

  Therefore, the radar system 1 suppresses the bias of the position of the center of gravity G of the radar system 1 in the Z-axis direction to the + Z side, and the recovery force increases, so that it is difficult for the radar system 1 to overturn.

  In the radar system 1, since the center of gravity G1 of the power supply system 100 and the center of gravity G10 of the radar device 200 are located on the same axis parallel to the Z axis, a moment of the center G1 of the power supply system 100 and the center of gravity G10 of the radar device 200 is generated. Instead, it can be submerged in water sequentially from the -Z side end of the radar system 1.

  FIG. 8 is a diagram showing the floating center H of the radar system. As shown in FIG. 8, the floating center H of the radar system 1 is located on the central axis Q of the cylindrical casing 11, and the center of gravity G and floating center H of the radar system 1 are the same axes parallel to the Z axis It is above. Therefore, when floating on water, a moment due to the center of gravity G of the radar system 1 and the center of floating H does not occur.

  The specific gravity of the hydrogen tank 20 is changed by using the filled hydrogen. Therefore, when the amount of hydrogen filled in each of the six hydrogen tanks 20 differs, the volume under the water of the radar system 1 changes, and the radar system 1 tilts.

  However, since the six hydrogen tanks 20 are arranged at equal intervals so as to surround the casing 11 of the fuel cell unit 10, even if the specific gravity of a part of the hydrogen tanks 20 changes, the entire six hydrogen tanks 20 are The position of the center of gravity G3 of is difficult to change. Therefore, the position of the center of gravity G of the radar system 1 and the position of the floating center H do not change easily, and a large inclination that the radar system 1 overturns does not occur. Then, in the radar system 1, the recovery force acts so that the action lines of gravity and buoyancy of the radar system 1 are on the same axis, and the radar system 1 is in a stable state.

  Thus, the radar system floats on the water surface S by arranging the hydrogen tanks 20 at equal intervals so as to surround the casing 11 of the fuel cell unit 10 along the side surface of the casing 11 of the fuel cell unit 10 The balance of 1 is improved, and overturning of the radar system 1 can be prevented.

  As described above, in the radar system 1 according to the present embodiment, the hydrogen tank 20 constituting the power supply system functions as a float, and the radar system 1 floats on water in a stable state. Therefore, no special configuration such as a container for generating buoyancy is required to keep the radar system 1 floating on water stable. As a result, the radar system 1 according to the present embodiment has a simple configuration, and the manufacturing cost can be reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited by the said embodiment. For example, in the above embodiment, the hydrogen storage unit 30 functions as a weight, but instead of the hydrogen storage unit 30, or separately from the hydrogen storage unit 30, a weight may be provided at the lower end of the fuel cell unit 10.

  Although the power supply system 100 includes six hydrogen tanks 20 and four hydrogen storage units 30 in the above embodiment, the number of hydrogen tanks 20 and hydrogen storage units 30 is not limited thereto.

  In the above embodiment, the hydrogen tank 20 that has finished using the hydrogen that has been filled is manually replaced with a new hydrogen tank 20 that is filled with hydrogen, by recovering the radar system 1 on the ship, for example, an unmanned operation It is possible to replace the hydrogen tank 20 which has been filled with hydrogen by machine etc. with the new hydrogen tank 20 filled with hydrogen.

  In the above embodiment, although the power supply system 100 is provided with the solenoid valve 17 only in the pipe 14b connected to the hydrogen storage unit 30, for example, a battery is provided and the pipe 13b connected to the hydrogen tank 20 is connected to the solenoid valve 17 may be provided. Then, the solenoid valve 17 may be controlled to use the hydrogen tanks 20 one by one in order. Furthermore, the solenoid valve 17 may be controlled to use the six hydrogen tanks 20 in a diagonal order.

  In the above embodiment, the radar transmitter 202 for transmitting the radar transmission wave L has only the transmission function, but may be a transceiver having the reception function. The radar device 200 may have a function of acquiring position information and the like, and the radar transmitter 202 may transmit information such as position information when transmitting the radar transmission wave L.

  In the above embodiment, the power supply system 100 is used to operate the radar device 200, but may be used to operate, for example, a lamp.

  As mentioned above, although embodiment of this invention was described, this embodiment is shown as an example and it is not intending limiting the range of invention. This novel embodiment can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. The present embodiment and the modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Reference Signs List 1 radar system 10 fuel cell unit 11 casing 11a lid 11b fixing device 12 fuel cell 13, 13a, 13b, 14, 14a, 14b piping 15 pressure sensor 16 check valve 17 solenoid valve 18 controller 20 hydrogen tank 21 connecting part 30 Hydrogen storage unit 100 Power supply system 200 Radar device 201 Dome 202 Radar transmitter F Vehicle L radar transmission wave R Reflected wave S Water surface G, G1, G2, G3, G4, G10 Center of gravity Q Center axis H Floating core

Claims (5)

A fuel cell which generates hydrogen by chemical reaction;
A casing for housing the fuel cell;
A plurality of hydrogen tanks disposed so as to surround the casing and filled with the hydrogen to generate buoyancy against water;
Power supply system comprising:   The power supply system according to claim 1, wherein the hydrogen tanks are equally spaced around the casing.   The power supply system according to claim 1 or 2, wherein a weight having a specific gravity larger than that of water is provided in the casing at a position below the hydrogen tank.   The power supply system according to claim 3, wherein the weight comprises a hydrogen storage alloy. A radar system installed on the water,
The power supply system according to any one of claims 1 to 4.
A radar device installed in the casing and operated by the power supplied from the fuel cell;
Radar system.

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