JP2011012764A - Device and method for manufacturing high-pressure tank for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for manufacturing a high-pressure tank for a vehicle capable of controlling the excessive temperature rise of a workpiece in a manufacturing process.SOLUTION: The manufacturing device includes a furnace body 20 that rises the temperature of the workpiece W obtained by wrapping a fiber-reinforced plastic material around a liner 101, a rotation rod 30 that rotates the workpiece W, a pressure regulating valve 401 that controls the pressure in the liner 101, and a liquid supply and exhaust system 40 that supplies a liquid in the liner 101 and exhausts a gas, that is the vaporized liquid, from the liner 101.

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method for a vehicle-mounted high-pressure tank.

  As a vehicle-mounted high-pressure tank, a tank in which the periphery of a liner is reinforced with a fiber-reinforced plastic layer is known. As a method for manufacturing such a vehicle-mounted high-pressure tank, a method described in Patent Document 1 below has been proposed. In the manufacturing method described in Patent Document 1 below, an inner shell corresponding to a liner is formed, and a fiber reinforced plastic (FRP: Fiber Reinforced Plastics) material is wound around the outer periphery of the inner shell by a filament winding method or the like. A high pressure tank is formed by raising the temperature (see Patent Document 1 below).

JP 2008-286297 A

  By the way, when a workpiece is formed by winding a fiber-reinforced plastic material around a liner and the workpiece is put into a curing furnace and the temperature is raised, a so-called overheating phenomenon occurs. Specifically, when the furnace temperature of the curing furnace is increased, the temperature of the workpiece decreases after a primary curing period in which the temperature of the workpiece increases rapidly after a temperature rising period in which the temperature of the workpiece gradually increases. Curing is completed by the main curing period at a constant temperature. In this case, it is considered that in the primary curing, the resin in the fiber reinforced plastic material layer is polymerized and heat is generated due to the polymerization reaction of the resin. In the main curing, a cross-linking reaction between the polymers occurs. It is considered a thing. Excessive temperature rise is a phenomenon in which the temperature of the fiber-reinforced plastic material layer rises above the curing temperature due to the heat generated by the polymerization reaction of the resin.

  If the temperature of the workpiece rises above the curing temperature in this way, there is a risk that thermal degradation will occur in the liner or fiber reinforced plastic material layer. For this reason, it is desirable to suppress the temperature rise as much as possible even if overheating does not occur as much as possible. However, as described above, overheating is caused by a chemical reaction. Even if the temperature is lowered, it is difficult to achieve a temperature rise suppression effect commensurate with the temperature drop. Nevertheless, if the temperature in the curing furnace is kept low in order to suppress the excessive temperature rise, it is assumed that the workpiece is not heated up to the curing temperature and poorly cured.

  It is also assumed that the fiber-reinforced plastic material layer is cooled using a refrigerant so as not to lower the temperature of the workpiece. However, when a gas is used as the refrigerant, the cooling effect is low because the heat capacity is small, and it is difficult to suppress overheating. On the other hand, when a liquid is used as the refrigerant, although the heat capacity is large, if a liquid refrigerant having a temperature lower than the curing temperature is supplied, the temperature distribution becomes uneven and local curing failure may occur. If a liquid refrigerant having a temperature equal to the curing temperature is supplied in order to improve such a curing failure, the cooling effect is lowered and the original purpose cannot be achieved.

  The present invention has been made in view of such problems, and an object thereof is a manufacturing apparatus and a manufacturing method for a vehicle-mounted high-pressure tank in which the periphery of a liner is reinforced with a fiber-reinforced plastic layer, and the manufacturing process An object of the present invention is to provide a manufacturing apparatus and a manufacturing method for a vehicle-mounted high-pressure tank capable of suppressing an excessive temperature rise of a workpiece.

  In order to solve the above-described problems, a vehicle-mounted high-pressure tank manufacturing apparatus according to the present invention is a vehicle-mounted high-pressure tank manufacturing apparatus in which the periphery of a liner is reinforced with fiber-reinforced plastic, and a fiber is provided around the liner. A temperature raising means for raising the temperature of the work around which the reinforced plastic material is wound, a rotating means for rotating the work, a pressure adjusting means for adjusting the pressure in the liner, a liquid is supplied into the liner, and the liquid Liquid supply / discharge means for discharging the vaporized gas from the liner.

  According to the manufacturing apparatus of the present invention, the pressure in the liner can be increased from the atmospheric pressure by the pressure adjusting means, and liquid can be supplied into the liner while maintaining the high pressure state. The liquid can be evaporated at a temperature matched to the temperature. Since the workpiece including the liner can be rotated, the evaporated liquid fills the inside of the liner, and evenly contacts the inner surface of the liner, thereby removing heat of vaporization from the liner. As a result, the liner can be cooled evenly by boiling cooling, and as a result, overheating of the fiber-reinforced plastic material can be suppressed. In addition, by evaporating the liquid inside the liner and filling it, and rotating the workpiece including the liner, the vaporization heat is removed uniformly from the inner surface of the liner, ensuring the necessary amount of cooling (vaporization heat amount) regardless of the inner volume of the liner. can do. In this way, overheating of the fiber-reinforced plastic material is suppressed from the inside by boiling cooling, and the temperature of the workpiece by the temperature raising means can maintain the temperature, so both curing failure and avoidance of overheating are achieved. Can be made.

  In order to solve the above problems, a method for manufacturing a high-pressure tank for mounting on a vehicle according to the present invention is a method for manufacturing a high-pressure tank for mounting on a vehicle in which the periphery of the liner is reinforced with fiber-reinforced plastic, and the step of preparing the liner And a step of winding a fiber reinforced plastic material around the liner to form a workpiece, and a step of curing the fiber reinforced plastic material to form a fiber reinforced plastic, the step of curing the fiber reinforced plastic material Then, an internal pressure higher than the atmospheric pressure is applied to the liner, a liquid is poured into the liner while maintaining a high pressure in the liner, and the pressure and the amount of liquid in the liner are adjusted while rotating the workpiece. The temperature is raised while holding.

  According to the manufacturing method of the present invention, the pressure in the liner is increased from the atmospheric pressure, and the liquid is supplied into the liner while maintaining the high pressure state. Therefore, the liquid is heated at a temperature that matches the curing temperature of the fiber-reinforced plastic material. Can be evaporated. Since the work including the liner is rotated, the vaporized liquid fills the inside of the liner and can contact the inner surface of the liner evenly to take heat of vaporization from the liner. As a result, the liner can be cooled evenly by boiling cooling, and as a result, overheating of the fiber-reinforced plastic material can be suppressed. In addition, by evaporating the liquid inside the liner and filling it, and rotating the workpiece including the liner, the vaporization heat is removed uniformly from the inner surface of the liner, ensuring the necessary amount of cooling (vaporization heat amount) regardless of the inner volume of the liner. can do. Thus, since the temperature rise of the workpiece can be maintained while suppressing the excessive temperature rise of the fiber reinforced plastic material from the inside by boiling cooling, it is possible to achieve both the poor curing and the avoidance of the excessive temperature rise. .

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing apparatus and manufacturing method of the high-pressure tank for vehicle mounting which can suppress the excessive temperature rise of the workpiece | work in a manufacture process can be provided.

It is sectional drawing which shows the vehicle-mounted high-pressure tank manufactured by the manufacturing method of the vehicle-mounted high-pressure tank which is embodiment of this invention. It is a flowchart for demonstrating the manufacturing method of the high-pressure tank for vehicle mounting which is embodiment of this invention. In the manufacturing method shown in FIG. 2, it is a figure for demonstrating the state which installed the workpiece | work which wound the fiber reinforced plastic material on the liner in the curing furnace. In the manufacturing method shown in FIG. 2, it is a figure for demonstrating the temperature relationship at the time of heating up a workpiece | work in a furnace.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same components are denoted by the same reference numerals as much as possible in the drawings, and redundant descriptions are omitted.

  First, a vehicle-mounted high-pressure tank manufactured by a manufacturing method according to an embodiment of the present invention will be described. FIG. 1 is a cross-sectional view of a vehicle-mounted high-pressure tank 10. As shown in FIG. 1, the vehicle-mounted high-pressure tank 10 includes a sealed cylindrical container body 2 as a whole and caps 102 a and 102 b attached to both ends of the container body 2 in the longitudinal direction. . The inside of the container body 2 is a storage space 5 for storing various gases. The vehicle-mounted high-pressure tank 10 can be filled with a normal pressure gas, or can be filled with a gas whose pressure is higher than that of the normal pressure. That is, the vehicle-mounted high-pressure tank 10 of the present invention can function as a high-pressure gas container.

  For example, in a fuel cell system, the fuel gas prepared in a high pressure state is decompressed and used for power generation of the fuel cell. The vehicle-mounted high-pressure tank 10 can be applied to store high-pressure fuel gas, and can store hydrogen as a fuel gas, compressed natural gas (CNG gas), and the like. The pressure of hydrogen charged in the vehicle-mounted high-pressure tank 10 is, for example, 35 MPa or 70 MPa, and the pressure of CNG gas is, for example, 20 MPa.

  The container body 2 has a two-layer structure of an inner liner 101 having gas barrier properties and a fiber reinforced plastic layer 103 disposed on the outer periphery of the liner 101. The fiber reinforced plastic layer 103 is made of, for example, FRP containing carbon fiber and an epoxy resin, and is configured to cover the outer surface of the liner 101.

  The bases 102 a and 102 b are made of a metal such as stainless steel or aluminum, for example, and are provided at the center of the hemispherical end wall portion of the container body 2. Female threads are engraved on the inner peripheral surfaces of the openings of the caps 102a and 102b, and the male threads of functional parts such as pipes and valve assemblies 14 (valve bodies) are screwed into the female threads to function. Components can be screwed into the caps 102a and 102b. In FIG. 1, an example in which the valve assembly 14 is provided only on the base 102a is indicated by a two-dot chain line.

  For example, the vehicle-mounted high-pressure tank 10 on the fuel cell system is connected between the storage space 5 and an external gas flow path (not shown) via a valve assembly 14 in which piping elements such as valves and joints are integrated. Are connected, hydrogen is filled into the storage space 5 and hydrogen is released from the storage space 5.

  The liner 101 is constituted by joining a pair of liner constituent members 101a and 101b having substantially the same shape divided into two at the center in the longitudinal direction by laser welding. That is, the liner 101 inside the hollow is configured by joining the liner structural members 101a and 101b of the half hollow body by laser welding.

  Then, the manufacturing method of the vehicle-mounted high-pressure tank which is embodiment of this invention is demonstrated, referring FIG. FIG. 2 is a flowchart for explaining a method of manufacturing a high-pressure tank for mounting on a vehicle. The vehicle-mounted high-pressure tank 10 manufactured in the present embodiment has a cylindrical shape with both ends closed as described with reference to FIG. 1, and is provided with caps 102a and 102b at both ends. Is.

  In step S01, a workpiece W formed by wrapping a fiber reinforced plastic material around a liner 101 having caps 102a and 102b at both ends to form a fiber reinforced plastic material layer 103p is placed in a curing furnace. The workpiece W is prepared by preparing a liner 101 provided with the caps 102a and 102b and winding a fiber reinforced plastic material around the prepared liner 101. Next, FIG. 3 shows a configuration of the curing furnace F.

  As shown in FIG. 3, the curing furnace F is provided with a furnace body 20 (temperature raising means) and a liquid supply / discharge system 40 (liquid supply / discharge means). The liquid supply / discharge system 40 includes a liquid pipe 41, a gas pipe 42, and a connection pipe 43. The connection pipe 43 branches so that a part thereof extends into the furnace body 20, and is connected to the base 102 a of the workpiece W in the furnace body 20. A water level confirmation unit 431 is provided in the vicinity of the branching portion of the connection pipe 43 so that the water level of the liquid in the connection pipe 43 and the workpiece W can be confirmed. The water level confirmation unit 431 has a transparent window (not shown) so that the water level of the liquid in the workpiece W can be visually recognized, and the water level of the liquid in the workpiece W is visually recognized through the transparent window, and the water level is data. It is configured to be obtainable as.

  A pressure regulating valve 401 and a pressure sensor 402 are provided on the downstream side of the branch portion of the connection pipe 43. The internal pressure in the work W can be adjusted by adjusting the pressure regulating valve 401, and the pressure sensor 402 is configured to be able to measure the internal pressure.

  A liquid pipe 41 and a gas pipe 42 pass through the connection pipe 43. The liquid pipe 41 and the gas pipe 42 are introduced from the upstream side of the branch part of the connection pipe 43 through the branch part into the furnace body 20 and are arranged to extend into the workpiece W.

  A heater 411 and a liquid pump 412 are arranged in the liquid pipe 41. The liquid pipe 41 is configured so that the liquid heated by the heater 411 (water (hot water) heated in this embodiment) can be fed into the workpiece W by the liquid pump 412. A gas pump 421 is disposed in the gas pipe 42. The gas pipe 42 is configured so that gas (air in this embodiment) can be sent into the workpiece W by the gas pump 421.

  By adjusting the pressure regulating valve 401 and the gas pump 421 as described above, the pressure in the work W connected to the connection pipe 43 can be adjusted, and functions as pressure regulating means. The connection pipe 43 is connected to the base 102a of the workpiece W, and the internal pressure of the liner 101 of the workpiece W is adjusted by the operation of each part as described above. A rotating rod 30 (rotating means) is attached to the other base 102b of the work W, and the work W can be appropriately rotated during the curing process. In the furnace body 20, a temperature sensor 20a for measuring the temperature in the furnace body 20 and a temperature sensor 20b for measuring the temperature of the workpiece W are provided. In the following description, FIG. 3 will be referred to as appropriate.

  In step S02 following step S01, a temperature rise in the furnace body 20 of the curing furnace F is started, and it is determined whether the temperature in the furnace body 20 has reached 100 ° C. If the temperature in the furnace body 20 does not reach 100 ° C., this determination is repeated, and if the temperature in the furnace body 20 reaches 100 ° C., the process proceeds to step S03.

  Here, the relationship between the temperature in the furnace body 20 and the internal pressure of the liner 101 of the workpiece W is shown in FIG. 4A is a graph showing the temperature, where WT indicates the temperature of the workpiece W and FT indicates the temperature in the furnace body 20. FIG. 4B is a graph showing the amount of water in the liner 101 of the workpiece W. FIG. 4C is a graph showing the pressure in the liner 101 of the workpiece W. Step S02 is a state from t0 to t1 in FIG. 4, in which the temperature in the furnace body 20 and the temperature of the workpiece W are rising. Further, the pressure in the liner 101 of the workpiece W is P1 equivalent to the atmospheric pressure.

  In step S03 following step S02, pressure adjustment in the liner 101 of the workpiece W is started. Specifically, the pressure in the liner 101 of the workpiece W is raised to P2 higher than the atmospheric pressure. In step S04 following step S03, hot water heated to about 95 ° C. is put into the liner 101 of the workpiece W. The hot water in the liner 101 of the work W is monitored via the water level confirmation unit 431 so as not to rise above the center line of the work W. The liquid pipe 41 and the gas pipe 42 are disposed above the center line of the workpiece W so as not to be submerged in this state. The workpiece W is rotated by the rotating rod 30.

  In the processing stage from step S03 to step S04, the state of the workpiece W corresponds to a state after t1 to t2 in FIG. Accordingly, the temperature of the workpiece W and the temperature in the furnace body 20 reach the curing temperature T of the fiber reinforced plastic material layer 103p. In this state, the liner 101 of the workpiece W is maintained at a pressure higher than the atmospheric pressure, so that the boiling temperature of water is adjusted to correspond to the curing temperature T. For example, when the curing temperature T is 130 ° C., the internal pressure of the liner 101 of the workpiece W is adjusted to about 0.27 MPa, and when the curing temperature T is 150 ° C., the internal pressure of the liner 101 of the workpiece W is about 0.47 ° C. Adjusted. After t2, the fiber reinforced plastic material layer 103p overheats and rises to a temperature that greatly exceeds the curing temperature T as indicated by the alternate long and short dash line in FIG. 4 when no measures are taken. However, in this embodiment, since warm water is supplied into the liner 101 of the workpiece W and the internal pressure is adjusted so that the boiling temperature of the water becomes the curing temperature T of the fiber reinforced plastic material layer 103p, the fiber reinforced plastic material The layer 103p is boiled and cooled from the inside through the liner 101. Therefore, as shown in FIG. 4, the degree of excessive temperature rise is reduced, and an excessive temperature rise is suppressed.

  In step S05 following step S04, it is determined whether or not the overheating completion time has been reached. In the case of this embodiment, the determination is made based on whether or not the time t3 has been reached. This determination is repeated if the overheating completion time t3 has not been reached, and if the overheating completion time t3 has been reached, the process proceeds to step S06.

  In step S06 following step S05, the warm water supply to the liner 101 of the workpiece W is stopped. Since the water in the liner 101 of the workpiece W continues to evaporate, the amount of water in the liner 101 decreases when the warm water supply to the liner 101 is stopped.

  In step S07 following step S06, it is determined whether or not the time when the water in the liner 101 of the workpiece W evaporates and disappears is reached. In the present embodiment, the determination is made based on whether or not the time t4 has been reached. If the evaporation completion time t4 has not been reached, this determination is repeated. If the evaporation completion time t4 has been reached, the process proceeds to step S08.

  In step S08 following step S07, the pressure adjustment in the liner 101 of the workpiece W is finished, and the pressure is reduced to a pressure P1 corresponding to the atmospheric pressure. Thereafter, the temperature FT of the furnace body 20 of the curing furnace F is lowered (time t5), and air is sent into the workpiece W and cooled also from the inside, whereby the fiber reinforced plastic material layer 103p is cured and the fiber reinforced plastic layer 103 is cooled. The vehicle-mounted high-pressure tank 10 is taken out.

2: Container body 5: Storage space 10: High-pressure tank 14 mounted on vehicle: Valve assembly 20: Furnace body 20a: Temperature sensor 20b: Temperature sensor 30: Rotating rod 101: Liner 101a, 101b: Liner components 102a, 102b: Base 103: Fiber reinforced plastic layer 103p: Fiber reinforced plastic material layer F: Curing furnace FT: Furnace body temperature W: Work WT: Work temperature 40: Liquid supply / discharge system 41: Liquid pipe 42: Gas pipe 43: Connection pipe 401: Pressure regulating valve 402: Pressure sensor 411: Heater 412: Liquid pump 421: Gas pump 431: Water level confirmation unit

Claims (2)

An apparatus for manufacturing a high-pressure tank for mounting on a vehicle in which the periphery of a liner is reinforced with fiber reinforced plastic,
A temperature raising means for raising the temperature of a work in which a fiber reinforced plastic material is wound around the liner;
Rotating means for rotating the workpiece;
Pressure adjusting means for adjusting the pressure in the liner;
A liquid supply / discharge means for supplying a liquid into the liner and discharging a gas vaporized from the liner from the liner;
A vehicle-mounted high-pressure tank manufacturing apparatus comprising: A method for manufacturing a high-pressure tank for mounting on a vehicle, in which the periphery of a liner is reinforced with fiber reinforced plastic,
Preparing the liner;
Winding a fiber reinforced plastic material around the liner to form a workpiece;
Curing the fiber reinforced plastic material to form a fiber reinforced plastic;
Including
In the step of curing the fiber reinforced plastic material, an internal pressure higher than atmospheric pressure is applied to the liner, a liquid is poured into the liner while maintaining a high pressure in the liner, and the workpiece is rotated while the workpiece is rotated. A method for manufacturing a vehicle-mounted high-pressure tank that raises the temperature while maintaining the pressure and the amount of liquid in the liner.

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