JP2010267553A - Fuel gas supply device for fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce noises generated from an injector capable of adjusting flow rates of a fuel gas and a fuel off-gas supplied to a fuel cell. <P>SOLUTION: A fuel gas supply device 1 for supplying a hydrogen gas to the fuel cell and circulating a hydrogen off-gas from the fuel cell to the fuel cell by mixing the hydrogen off-gas into a hydrogen gas includes an ejector 6 for mixing the hydrogen gas and the hydrogen off-gas, the injector 5 for injection-supplying the hydrogen gas to the ejector 6 and adjusting a flow rate of the hydrogen gas, a plate-shaped first soundproof wall 23 mounting the injector 5 on an upper surface, a soundproof cover 22 mounted on the upper surface of the first soundproof wall 23 so as to cover an outer periphery of the injector 5, and a plate-shaped second soundproof wall 24 mounted by piling up on a lower surface of the first soundproof wall 23. The ejector 6 is arranged between the first soundproof wall 23 and the second soundproof wall 24, and a communication hole 22c for forming a passage to supply a fuel to the injector 5 is formed on the soundproof cover 22. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a fuel cell system including a fuel cell, and more particularly to a fuel gas supply device used for supplying fuel gas to a fuel cell.

  Conventionally, as this type of technology, for example, fuel cell systems described in Patent Documents 1 to 3 below are known. The fuel cell system described in Patent Document 1 includes a fuel cell that generates power upon receiving supply of fuel gas (hydrogen gas or the like) and oxygen gas (air or the like). Here, the off gas discharged from the fuel cell includes fuel gas that has not reacted for power generation of the fuel cell. Therefore, in the fuel cell system described above, unreacted fuel off-gas is mixed with the fuel gas and circulated to the fuel cell.

  On the other hand, in the fuel cell systems described in Patent Documents 2 and 3, an ejector and an injector are used to stabilize the small flow rate control of the fuel gas and the fuel off-gas to the fuel cell. The fuel gas is injected by the injector toward the nozzle of the ejector, and a negative pressure is generated at the nozzle to suck the fuel off gas. Therefore, since the injection amount of the fuel gas from the injector to the ejector can be adjusted, the small flow rate control of the fuel gas and the fuel off-gas from the ejector to the fuel cell can be stabilized.

JP 2004-319413 A JP 2008-190336 A JP 2008-196401 A

  However, in the fuel cell system described in Patent Document 2, since the fuel gas is injected using the injector, the operation sound of the injector may be a noise source of the system. In this fuel cell system, the injector is simply attached to the ejector, and no measures are taken against the noise caused by the operating sound of the injector. Here, the noise generated due to the injector operating sound includes (1) sound transmitted from the injector surface to the injector body and radiated from the injector surface to the outside (in the air). 2) The operating vibration of the injector valve element is transmitted to the piping, etc., and is radiated to the outside (in the air) from the surface. (3) The fluid pulsation is generated by the operation of the injector valve element. There are three possible sounds: (vibration) vibrates downstream piping and the like, and radiates from the surface to the outside (in the air). As described above, as a fuel cell system using an injector as a noise source, it is demanded to make the system quiet when mounted on an electric vehicle.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to adjust the flow rates of the fuel gas and the fuel off-gas supplied to the fuel cell by the injector, and to reduce the noise emitted from the injector. It is to provide a fuel gas supply device of a system. In addition to the above object, another object of the present invention is to provide a fuel gas supply device for a fuel cell system equipped with an ejector and an injector in a compact manner.

  In order to achieve the above object, the invention described in claim 1 supplies a fuel gas to a fuel cell constituting a fuel cell system and mixes a fuel off-gas discharged from the fuel cell with the fuel gas. A fuel gas supply device for a fuel cell system that circulates to an ejector, an ejector that mixes fuel gas and fuel off-gas, and an injector that is configured to inject and supply fuel gas to the ejector and to adjust the fuel gas injection amount The first soundproof wall having a plate shape and the injector attached to the upper surface, the soundproof cover attached to the upper surface of the first soundproof wall so as to cover the outer periphery of the injector, and the soundproof cover are provided with fuel to the injector. The purpose is to provide a communication hole constituting a passage for supplying.

  According to the configuration of the invention, the fuel gas is supplied to the injector through the communication hole of the soundproof cover. The fuel gas injected and supplied from the injector to the ejector is supplied to the fuel cell. Further, the fuel off-gas discharged from the fuel cell is sucked into the ejector, mixed with the fuel gas injected from the injector, and circulated to the fuel cell. By adjusting the injection amount of fuel gas to the ejector by the injector, the supply flow rate of fuel gas to the ejector can be adjusted stably in a small flow rate range, and accordingly the flow rate of fuel off gas to the ejector is also stable. Adjusted. Here, vibrations emitted from the injector during operation of the injector are attenuated and absorbed by the first soundproof wall, and radiated sound that is about to be emitted from the injector to the outside is blocked by the first soundproof wall and the soundproof cover.

  In order to achieve the above object, the invention described in claim 2 further includes a plate-like second soundproof wall attached to the lower surface of the first soundproof wall in the invention described in claim 1, The purpose is that an ejector is provided between the first soundproof wall and the second soundproof wall.

  According to the configuration of the above invention, in addition to the operation of the invention according to the first aspect, vibration emitted from the injector is attenuated and absorbed by the second soundproof wall in addition to the first soundproof wall. Further, since the ejector is provided between the first soundproof wall and the second soundproof wall, and the injector is attached to the upper surface of the first soundproof wall, the ejector and the injector are modularized.

  In order to achieve the above object, the invention described in claim 3 is that, in the invention described in claim 1 or 2, a soundproof material is interposed between the first soundproof wall and the injector. .

  According to the configuration of the invention described above, in addition to the operation of the invention according to claim 1 or 2, vibration emitted from the injector is also attenuated and absorbed by the soundproofing material.

  To achieve the above object, the invention according to claim 4 is the invention according to claim 2 or 3, further comprising a pump for pumping fuel off-gas to the ejector, wherein the pump is a lower surface of the second soundproof wall. It is intended that it was attached to.

  According to the structure of the said invention, in addition to the effect | action of the invention of Claim 2 or 3, in addition to an ejector and an injector, they and a pump are modularized and comprised. The vibration coming out of the pump is attenuated and absorbed by the second sound barrier and the first sound barrier.

  In order to achieve the above object, according to a fifth aspect of the present invention, in the fourth aspect of the present invention, the pump includes a pump unit for sucking and discharging the fuel off-gas, and a driving unit for driving the pump unit. The pump is attached to the second soundproof wall via the pump unit.

  According to the configuration of the above invention, in addition to the operation of the invention according to the fourth aspect, vibration emitted from the pump portion of the pump is attenuated and absorbed by the second soundproof wall and the first soundproof wall.

  In order to achieve the above object, according to a sixth aspect of the present invention, in the fourth aspect of the present invention, the pump includes a pump unit for sucking and discharging the fuel off-gas, and a drive unit for driving the pump unit. The pump is attached to the second soundproof wall via the drive unit.

  According to the configuration of the invention described above, in addition to the operation of the invention according to claim 4, vibrations emitted from the drive unit of the pump are attenuated and absorbed by the second sound insulation wall and the first sound insulation wall, and are generated by heat emitted from the drive unit. The second sound barrier and the first sound barrier are warmed.

  To achieve the above object, the invention according to claim 7 is the invention according to any one of claims 1 to 6, further comprising a buffer case for reducing pulsation of high-pressure fuel gas, The buffer case is attached to the upper surface side of the first soundproof wall so as to cover the outer periphery of the soundproof cover, and the buffer case is provided with an introduction hole for introducing fuel gas into the inside.

  According to the configuration of the invention, in addition to the operation of the invention according to any one of claims 1 to 6, the radiated sound to be radiated to the outside from the injector is blocked by the first soundproof wall and the soundproof cover. Further, it is blocked by a buffer case. Further, the high-pressure fuel gas is introduced into the inside through the introduction hole of the buffer case, and is supplied to the injector through the communication hole of the soundproof cover. Here, the fuel gas layer in the internal space between the buffer case and the soundproof cover also acts as an absorption layer that absorbs radiation sound from the injector. Further, the high-pressure fuel gas is suppressed in pulsation in the internal space of the buffer case, and the fuel gas is supplied to the injector with the pulsation suppressed.

  In order to achieve the above object, according to an eighth aspect of the present invention, fuel gas is supplied to a fuel cell constituting a fuel cell system, and a fuel off-gas discharged from the fuel cell is mixed with the fuel gas to thereby provide a fuel cell. A fuel gas supply device for a fuel cell system that circulates to an ejector, an ejector that mixes fuel gas and fuel off-gas, and an injector that is configured to inject and supply fuel gas to the ejector and to adjust the fuel gas injection amount A plate-shaped first soundproof wall having an injector attached to the upper surface, a cover attached to the upper surface of the first soundproof wall so as to cover the outer periphery of the injector, an inner space of the cover, and a storage chamber for accommodating the injector A partition provided so as to divide into two into a buffer chamber for introducing fuel gas, and provided in the partition for supplying fuel to the injector A communication hole that constitutes the road, and the spirit that a introduction hole provided in the cover for introducing fuel gas into the buffer chamber.

  According to the configuration of the invention, the fuel gas injected and supplied from the injector to the ejector is supplied to the fuel cell. Further, the fuel off-gas discharged from the fuel cell is sucked into the ejector, mixed with the fuel gas injected from the injector, and circulated to the fuel cell. By adjusting the injection amount of fuel gas to the ejector by the injector, the supply flow rate of fuel gas to the ejector can be adjusted stably in a small flow rate range, and accordingly the flow rate of fuel off gas to the ejector is also stable. Adjusted. Here, vibrations emitted from the injector during operation of the injector are attenuated and absorbed by the first sound barrier, and radiated sound to be radiated from the injector to the outside is blocked by the first sound barrier, the cover, and the partition. The Further, the high-pressure fuel gas is introduced into the buffer chamber from the introduction hole of the cover, and is supplied to the injector through the communication hole of the partition wall. Here, the gas layer in the buffer chamber between the cover and the partition wall also acts as an absorption layer that absorbs radiation sound from the injector. Furthermore, pulsation of the high-pressure fuel gas is suppressed in the buffer chamber of the cover, and the fuel gas is supplied to the injector with the pulsation suppressed.

  In order to achieve the above object, the invention according to claim 9 is the invention according to any one of claims 4 to 6, wherein the first soundproof wall and the first soundproof wall are provided to absorb vibrations from the injector and the pump. It is intended that the second sound barrier is disposed between the injector and the pump.

  According to the configuration of the invention, in addition to the operation of the invention according to any one of claims 4 to 6, vibrations emitted from the injector and the pump are attenuated and absorbed by the first soundproof wall and the second soundproof wall, respectively. Is done.

  According to the first aspect of the present invention, the small flow rate control of the fuel gas and the fuel off-gas from the ejector to the fuel cell can be stabilized, the noise emitted from the injector can be reduced, and the quietness of the fuel cell system can be achieved. Can be improved.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, noise emitted from the injector can be further reduced, and the ejector and the injector can be compactly equipped.

  According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, noise emitted from the injector can be further reduced.

  According to the invention described in claim 4, in addition to the effect of the invention described in claim 2 or 3, it is possible to reduce the noise emitted from the pump and to equip the ejector, the injector and the pump in a compact manner.

  According to the fifth aspect of the invention, in addition to the effect of the fourth aspect of the invention, noise generated from the pump portion of the pump can be reduced.

  According to the sixth aspect of the invention, in addition to the effect of the fourth aspect of the invention, it is possible to reduce noise particularly from the pump drive section and to prevent problems due to freezing of the ejector.

  According to the invention described in claim 7, in addition to the effect of the invention described in any one of claims 1 to 6, noise emitted from the injector can be further reduced, and the fuel gas can be stably supplied from the injector. The fuel gas and the fuel off-gas supply from the ejector to the fuel cell can be stabilized.

  According to the eighth aspect of the invention, it is possible to stabilize the small flow rate control of the fuel gas and the fuel off-gas from the ejector to the fuel cell, reduce the noise emitted from the injector, and reduce the noise of the fuel cell system. Can be improved. In addition, the fuel gas can be stably injected from the injector, and the supply of the fuel gas and the fuel off-gas from the ejector to the fuel cell can be stabilized.

  According to the ninth aspect of the present invention, an effect equivalent to that of the fourth aspect of the present invention can be obtained.

The front sectional view concerning a 1st embodiment and showing a fuel gas supply device. Similarly, the bottom view of FIG. 1 which shows a fuel gas supply apparatus. Similarly, sectional drawing which followed the AA line of FIG. 1 which shows a fuel gas supply apparatus. Similarly, sectional drawing which followed the BB line of FIG. 1 which shows a fuel gas supply apparatus. Similarly, the schematic block diagram which shows the fuel cell system which uses a fuel gas supply apparatus. The front view which concerns on 2nd Embodiment and cuts and shows a fuel gas supply apparatus partially. Similarly, sectional drawing along CC line of FIG. 6 which shows a fuel gas supply apparatus. The front view which concerns on 3rd Embodiment and cuts and shows a fuel gas supply apparatus partially. Similarly, sectional drawing which followed the DD line | wire of FIG. 8 which shows a fuel gas supply apparatus. The front sectional view concerning a 4th embodiment which shows a fuel gas supply device. The front sectional view showing a fuel gas supply device concerning a 5th embodiment. The front sectional view concerning a 6th embodiment and showing a fuel gas supply device.

[First Embodiment]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fuel gas supply device for a fuel cell system according to a first embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front sectional view showing a fuel gas supply device 1 of this embodiment. FIG. 2 shows the fuel gas supply device 1 from the bottom view of FIG. FIG. 3 shows the fuel gas supply device 1 in a cross-sectional view along the line AA in FIG. FIG. 4 shows the fuel gas supply device 1 in a cross-sectional view along the line BB in FIG. FIG. 5 schematically shows a fuel cell system 2 using the fuel gas supply device 1.

  As shown in FIG. 5, the fuel cell system 2 of this embodiment includes a fuel cell 3, and on the anode side of the fuel cell 3, a hydrogen tank 4, a hydrogen injector 5, an ejector 6, a hydrogen pump 7, a gas-liquid separation. A vessel 8 and an exhaust / drain valve 9 are provided. An air compressor 10, a humidifier 11, and a pressure regulating valve 12 are provided on the cathode side of the fuel cell 2.

  In the fuel cell system 2, the air as the oxidant gas is pressurized by the air compressor 10, humidified by the humidifier 11, and supplied to the fuel cell 3. The air supplied to the fuel cell 3 is used for power generation in the battery 3, and then discharged from the fuel cell 3 as air off-gas and is discharged to the outside through the pressure regulating valve 12. The pressure regulating valve 12 adjusts the air pressure in the fuel cell 3.

  In the fuel cell system 2, hydrogen gas as fuel gas stored in the hydrogen tank 4 is supplied to the fuel cell 3 via the hydrogen injector 5 and the ejector 6. The hydrogen gas supplied to the fuel cell 3 is used for power generation in the battery 3 and then discharged from the fuel cell 3 as hydrogen offgas which is fuel offgas. The discharged hydrogen off-gas is separated from the water contained in the gas by the gas-liquid separator 8, and then discharged to the ejector 6 by the hydrogen pump 7, mixed with the hydrogen gas flowing through the ejector 6, and circulated to the fuel cell 3. To do. The water recovered by the gas-liquid separator 8 is appropriately discharged by opening the exhaust / drain valve 9 as necessary. In this embodiment, the hydrogen injector 5 and the ejector 6 constitute the fuel gas supply device 1.

  As shown in FIGS. 1 and 2, the fuel gas supply device 1 is attached to the body 21 so as to cover the body 21 constituting the ejector 6, the hydrogen injector 5 attached to the body 21, and the outer periphery of the hydrogen injector 5. And a soundproof cover 22. The body 21 has a quadrangular shape in plan view and bottom view, and is configured in a thick plate shape. The hydrogen injector 5 is vertically mounted on the upper surface of the body 21 so that the hydrogen injector 5 and the ejector 6 (body 21) are modularized. The hydrogen injector 5 is provided to inject and supply hydrogen gas to the ejector 6 and to adjust the injection amount of hydrogen gas. The hydrogen injector 5 is composed of an electromagnetic valve, and has a well-known configuration in which the injection amount of hydrogen gas can be adjusted by moving the valve body 5b by exciting the coil 5a by energization. The hydrogen injector 5 is provided with a power supply connector 5c. A conductive wire drawn into the soundproof cover 22 from the outside is connected to the connector 5c.

  As shown in FIG. 1, the body 21 includes a plate-shaped first soundproof wall 23 and a plate-shaped second soundproof wall 24 attached to the lower surface of the first soundproof wall 23. These soundproof walls 23 and 24 have a soundproofing function, for example, are formed from metal or resin. The hydrogen injector 5 is attached to the upper surface of the first soundproof wall 23. The ejector 6 is provided between the first soundproof wall 23 and the second soundproof wall 24.

  As shown in FIG. 1, the body 21 is provided with a nozzle 25 for injecting hydrogen gas, and an attachment port 26 to which the hydrogen injector 5 is attached is provided upstream of the nozzle 25. The body 21 is provided with a suction port 27 for sucking hydrogen off gas below the nozzle 25. The body 21 is provided with a diffuser 28 that mixes the hydrogen gas injected from the nozzle 25 and the hydrogen off-gas sucked from the suction port 27 on the downstream side of the nozzle 25. The body 21 is provided with a discharge port 29 for discharging the mixed hydrogen gas and hydrogen off-gas to the outside on the downstream side of the diffuser 28. In this embodiment, the nozzle 25 is formed separately from the body 21 and assembled to the body 21. The nozzle 25 and the diffuser 28 are disposed on substantially the same axis. The axes of the attachment port 26 and the suction port 27 intersect perpendicularly to the axis of the nozzle 25 and the like. The attachment port 26 opens upward of the body 21, and the suction port 27 opens downward of the body 21.

  As shown in FIG. 1, the upper half of the diffuser 28 and the attachment port 26 are formed in the first soundproof wall 23. A cylindrical base 30 including the attachment port 26 is formed on the upper surface of the first soundproof wall 23 so as to protrude upward. The tip of the hydrogen injector 5 is fitted and fixed to the pedestal 30. A soundproof material 31 is interposed between the pedestal 30 and the tip of the hydrogen injector 5. The soundproof material 31 is made of, for example, metal or resin. The hydrogen injector 5 attached to the pedestal 30 is disposed upright from the upper surface of the first soundproof wall 23. The lower half of the diffuser 28 and the like, the suction port 27 and the discharge port 29 are formed in the second soundproof wall 24. The first soundproof wall 23 and the second soundproof wall 24 are joined to each other to form a diffuser 28 and the like, and the attachment port 26, the suction port 27, and the discharge port 29 are configured to communicate with each other. . As shown in FIGS. 1 and 4, a circumferential groove 32 that forms an annular shape around the attachment port 26 is formed on the lower surface of the first soundproof wall 23. An O-ring 33 for hermetic sealing is disposed in the circumferential groove 32.

  The soundproof cover 22 provided on the upper surface of the first soundproof wall 23 includes a bottomed cylindrical portion 22a and a flange portion 22b formed on the outer periphery of the lower end of the cylindrical portion 22a. The flange portion 22 b is in surface contact with the upper surface of the first soundproof wall 23 and is fixed by a bolt 34. A communication hole 22c constituting a passage for supplying fuel gas to the hydrogen injector 5 is formed on the upper surface side of the cylindrical portion 22a. A fuel port 5d of the hydrogen injector 5 is disposed in the communication hole 22c. The soundproof cover 22 has a soundproof function, for example, is formed of metal or resin.

  As described above, according to the fuel gas supply device 1 of this embodiment, hydrogen gas is introduced from the hydrogen tank 4 into the fuel port 5d of the hydrogen injector 5 through the communication hole 22c of the soundproof cover 22. The hydrogen gas injected and supplied from the hydrogen injector 5 to the ejector 6 is supplied from the ejector 6 to the fuel cell 3. Further, the hydrogen off-gas discharged from the fuel cell 3 is sucked into the ejector 6, mixed with the hydrogen gas injected from the hydrogen injector 5, and circulated to the fuel cell 3. Here, by adjusting the injection amount of the hydrogen gas to the ejector 6 by the hydrogen injector 5, the supply flow rate of the hydrogen gas to the ejector 6 can be stably adjusted in a small flow rate region, and accordingly, to the ejector 6. The hydrogen off-gas intake flow rate is also stably adjusted. For this reason, the small flow control of the hydrogen gas and hydrogen off-gas supplied from the ejector 6 to the fuel cell 3 can be stabilized.

  Here, the vibration emitted from the injector 5 during the operation of the hydrogen injector 5 is attenuated and absorbed by the first soundproof wall 23, and the sound radiated from the injector 5 to be radiated to the outside is the first soundproof wall 23. And the soundproof cover 22. For this reason, the noise emitted from the hydrogen injector 5 can be reduced, and the quietness of the fuel cell system 2 can be improved.

  In this embodiment, since the second soundproof wall 24 is integrally attached to the first soundproof wall 23, the vibration emitted from the hydrogen injector 5 is attenuated by the second soundproof wall 24 in addition to the first soundproof wall 23. And absorbed. For this reason, the noise emitted from the hydrogen injector 5 can be further reduced.

  In addition, since the soundproofing material 31 is interposed between the first soundproofing wall 23 and the hydrogen injector 5, vibrations emitted from the hydrogen injector 5 are also attenuated and absorbed by the soundproofing material 31. Also in this sense, noise emitted from the hydrogen injector 5 can be further reduced.

  In addition, since the ejector 6 is provided between the first soundproof wall 23 and the second soundproof wall 24 and the hydrogen injector 5 is attached to the upper surface of the first soundproof wall 23, the ejector 6 and the hydrogen injector 5 are modularized. Composed. For this reason, the ejector 6 and the hydrogen injector 5 can be equipped compactly.

[Second Embodiment]
Next, a second embodiment in which the fuel gas supply device of the fuel cell system according to the present invention is embodied will be described in detail with reference to the drawings.

  In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described below.

  In FIG. 6, the fuel gas supply apparatus 41 of this embodiment is partly cut and shown in a front view. FIG. 7 shows the fuel gas supply device 41 in a cross-sectional view along the line CC in FIG. The fuel gas supply device 41 of this embodiment is the same as that of the first embodiment in that a hydrogen pump 7 for pumping hydrogen off gas to the ejector 6 is attached to the lower surface of the second soundproof wall 24 constituting the ejector 6. The configuration is different from that of the fuel gas supply device 1. That is, in this embodiment, in order to absorb vibrations from the hydrogen injector 5 and the hydrogen pump 7, the first soundproof wall 23 and the second soundproof wall 24 are disposed between the hydrogen injector 5 and the hydrogen pump 7.

  As shown in FIG. 6, the hydrogen pump 7 includes a pump unit 42 including a pump member (not shown) such as an impeller for sucking and discharging hydrogen off-gas, and a motor (not shown) for driving the pump member. And a built-in drive unit 43. In this embodiment, the hydrogen pump 7 is attached to the lower surface of the second soundproof wall 24 via the pump unit 42. The pump unit 42 and the second soundproof wall 24 are connected to each other by, for example, a bolt (not shown).

  Here, as shown in FIG. 7, on the lower surface of the second soundproof wall 24, a discharge hole 44 provided on the upper surface of the pump portion 42 and a suction port formed substantially at the center of the lower surface of the second soundproof wall 24. A communication groove 45 is formed to communicate with the terminal 27. As shown in FIGS. 6 and 7, an annular circumferential groove 46 is formed on the lower surface of the second soundproof wall 24 so as to surround the suction port 27 and the communication groove 45. An airtight sealing packing 47 is arranged in the circumferential groove 46.

  Therefore, in this embodiment, in addition to the ejector 6 and the hydrogen injector 5, they and the hydrogen pump 7 are configured as a module. For this reason, the ejector 6, the hydrogen injector 5, and the hydrogen pump 7 can be equipped compactly.

  Moreover, in this embodiment, the vibration which comes out of the pump part 42 of the hydrogen pump 7 is attenuated and absorbed by the second soundproof wall 24 and the first soundproof wall 23. For this reason, noise emitted from the hydrogen pump 7, particularly noise emitted from the pump unit 42 can be reduced.

[Third Embodiment]
Next, a third embodiment in which the fuel gas supply device of the fuel cell system according to the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 8 is a partial sectional view showing a front view of the fuel gas supply device 51 of this embodiment. FIG. 9 shows the fuel gas supply device 51 in a cross-sectional view along the line DD in FIG. Similar to the second embodiment, the fuel gas supply device 51 of this embodiment differs in configuration from the fuel gas supply device 1 of the first embodiment in that the hydrogen pump 7 is attached to the lower surface of the second soundproof wall 24. .

  In this embodiment, unlike the second embodiment, the hydrogen pump 7 is attached to the lower surface of the second soundproof wall 24 via the drive unit 43. The drive unit 43 and the second soundproof wall 24 are connected to each other by, for example, a bolt (not shown).

  Here, as shown in FIG. 9, a communication hole 52 extending from the suction port 27 and opening on the side surface of the soundproof wall 24 is formed inside the second soundproof wall 24. A pipe (not shown) extending from the discharge hole (not shown) of the pump portion 42 of the hydrogen pump 7 is connected to the communication hole 52.

  Therefore, in this embodiment, in addition to the ejector 6 and the hydrogen injector 5, they and the hydrogen pump 7 are configured as a module. For this reason, the ejector 6, the hydrogen injector 5, and the hydrogen pump 7 can be equipped compactly.

  Moreover, in this embodiment, the vibration which comes out from the drive part 43 of the hydrogen pump 7 is attenuated and absorbed by the second soundproof wall 24 and the first soundproof wall 23. For this reason, the noise emitted from the hydrogen pump 7, particularly the noise emitted from the drive unit 43 can be reduced.

  Furthermore, in this embodiment, the drive part 43 generates heat by the heat generated by the motor. Accordingly, the second soundproof wall 24 and the first soundproof wall 23 are warmed by the heat emitted from the drive unit 43. Further, it is also warmed by heat emitted from the coil 5a of the injector 5. For this reason, it is possible to prevent the ejector 6 from freezing during cold weather, and it is possible to prevent problems of the ejector 6 due to freezing.

[Fourth Embodiment]
Next, a fourth embodiment that embodies the fuel gas supply device of the fuel cell system according to the present invention will be described in detail with reference to the drawings.

  FIG. 10 is a front sectional view showing the fuel gas supply device 61 of this embodiment. The fuel gas supply device 61 of this embodiment further includes a buffer case 62 for reducing the pulsation of high-pressure hydrogen gas from the hydrogen tank 4, and the buffer case 62 covers the outer periphery of the soundproof cover 22. The configuration differs from the fuel gas supply device 1 of the first embodiment in that it is attached to the upper surface side of the soundproof wall 23.

  The buffer case 62 includes a bottomed cylindrical portion 62a and a flange portion 62b formed on the outer periphery of the lower end of the cylindrical portion 62a. The flange portion 62 b is in surface contact with the upper surface of the flange portion 22 b of the soundproof cover 22 and is fixed by a bolt 63. An introduction hole 62c for introducing hydrogen gas into the case 62 is formed on the upper surface side of the cylindrical portion 62a.

  Therefore, according to the fuel gas supply device 61 of this embodiment, the radiated sound that is about to be radiated from the hydrogen injector 5 is blocked by the first soundproof wall 23 and the soundproof cover 22, and is also blocked by the buffer case 62. Is done. Further, the high-pressure hydrogen gas is introduced into the inside through the introduction hole 62 c of the buffer case 62, and is introduced into the fuel port 5 d of the hydrogen injector 5 through the communication hole 22 c of the soundproof cover 22. Here, the hydrogen gas layer in the internal space 64 between the buffer case 62 and the soundproof cover 22 also functions as an absorption layer that absorbs sound radiated from the hydrogen injector 5. For this reason, the noise emitted from the hydrogen injector 5 can be further reduced as compared with the fuel gas supply apparatus 1 of the first embodiment.

  In this embodiment, the high-pressure hydrogen gas introduced from the introduction hole 62c of the buffer case 62 to the inside thereof is suppressed in pulsation in the internal space 64 between the buffer case 62 and the soundproof cover 22, thereby suppressing pulsation. In this state, hydrogen gas is supplied to the hydrogen injector 5. For this reason, hydrogen gas can be stably injected from the hydrogen injector 5, and supply of hydrogen gas and hydrogen off-gas from the ejector 6 to the fuel cell 3 can be stabilized. Other functions and effects of this embodiment are basically the same as those of the first embodiment.

[Fifth Embodiment]
Next, a fifth embodiment in which the fuel gas supply device of the fuel cell system according to the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 11 is a front sectional view showing the fuel gas supply device 71 of this embodiment. The fuel gas supply device 71 of this embodiment schematically differs from the fuel gas supply device 61 of the fourth embodiment in that the soundproof cover 22 is omitted. Specifically, in this fuel gas supply device 71, a cover 72 is attached to the upper surface of the first soundproof wall 23 so as to cover the outer periphery of the hydrogen injector 5. The configuration of the cover 72 is substantially the same as the buffer case 62 of the fourth embodiment. The cover 72 has a flange portion 72 b in surface contact with the upper surface of the first soundproof wall 23 and is fixed by a bolt 73. A partition wall 74 is horizontally arranged and fixed inside the cover 72. The partition 74 divides the internal space of the cover 72 into a storage chamber 75 that stores the hydrogen injector 5 and a buffer chamber 76 that introduces hydrogen gas. The partition wall 74 is formed with a communication hole 74 a that constitutes a passage for supplying fuel gas to the hydrogen injector 5. A fuel port 5d of the hydrogen injector 5 is disposed in the communication hole 74a. An introduction hole 72 c for introducing hydrogen gas into the buffer chamber 76 is formed on the upper surface of the cylinder portion 72 a of the cover 72.

  Therefore, according to the fuel gas supply device 71 of this embodiment, vibrations emitted from the hydrogen injector 5 during the operation of the hydrogen injector 5 are attenuated and absorbed by the first sound barrier 23 and radiated from the hydrogen injector 5 to the outside. The radiated sound is blocked by the first soundproof wall 23, the cover 72, and the partition wall 74. Further, high-pressure hydrogen gas is introduced into the buffer chamber 76 through the introduction hole 72 c of the cover 72, and is introduced into the fuel port 5 d of the hydrogen injector 5 through the communication hole 74 a of the partition wall 74. Here, the hydrogen gas layer in the buffer chamber 76 between the cover 72 and the partition wall 74 also functions as an absorption layer that absorbs radiation sound from the hydrogen injector 5. For this reason, the noise emitted from the hydrogen injector 5 can be reduced, and the quietness of the fuel cell system 2 can be improved.

  Further, in this embodiment, the high-pressure hydrogen gas introduced into the buffer chamber 76 from the introduction hole 72c of the cover 72 is suppressed in pulsation in the buffer chamber 76, and in a state where the pulsation is suppressed, the hydrogen gas is supplied to the hydrogen injector 5. To be supplied. For this reason, hydrogen gas can be stably injected from the hydrogen injector 5, and supply of hydrogen gas and hydrogen off-gas from the ejector 6 to the fuel cell 3 can be stabilized. Other functions and effects of this embodiment are basically the same as those of the first embodiment.

[Sixth Embodiment]
Next, a sixth embodiment in which the fuel gas supply device of the fuel cell system according to the present invention is embodied will be described in detail with reference to the drawings.

  FIG. 12 is a front sectional view showing the fuel gas supply device 81 of this embodiment. The fuel gas supply device 81 of this embodiment is different in configuration from the fuel gas supply device 71 of the fifth embodiment in that the accommodation chamber 75 is filled with a soundproof material 82. As the soundproof material 82, for example, urethane or non-woven fabric can be used.

  Therefore, in this embodiment, the soundproofing material 82 in the storage chamber 75 functions as an absorption layer that absorbs the radiated sound from the hydrogen injector 5. For this reason, the noise emitted from the hydrogen injector 5 can be further reduced, and the quietness of the fuel cell system 2 can be further improved.

  The present invention is not limited to the above-described embodiments, and a part of the configuration can be changed as appropriate without departing from the spirit of the invention.

  The present invention is a fuel cell system including a fuel cell, and can be applied to, for example, a fuel cell system mounted on an electric vehicle.

DESCRIPTION OF SYMBOLS 1 Fuel gas supply apparatus 2 Fuel cell system 3 Fuel cell 5 Hydrogen injector 6 Ejector 7 Hydrogen pump (pump)
22 soundproof cover 22c communication hole 23 first soundproof wall 24 second soundproof wall 31 soundproof material 41 fuel gas supply device 42 pump unit 43 drive unit 51 fuel gas supply device 61 fuel gas supply device 62 buffer case 62c introduction hole 71 fuel gas supply Device 72 Cover 72c Introduction hole 74 Partition 75 Storage chamber 76 Buffer chamber

Claims (9)

A fuel gas supply device for a fuel cell system that supplies fuel gas to a fuel cell constituting the fuel cell system, and mixes fuel off-gas discharged from the fuel cell with the fuel gas and circulates the fuel gas into the fuel cell. ,
An ejector for mixing the fuel gas and the fuel off-gas;
Injecting and supplying the fuel gas to the ejector, and an injector provided to adjust the flow rate of the fuel gas;
A first soundproof wall having a plate shape and the injector attached to an upper surface;
A soundproof cover attached to the upper surface of the first soundproof wall so as to cover the outer periphery of the injector;
A fuel gas supply device for a fuel cell system, comprising a communication hole provided in the soundproof cover and constituting a passage for supplying fuel to the injector. It further comprises a plate-like second soundproof wall attached to the lower surface of the first soundproof wall, and the ejector is provided between the first soundproof wall and the second soundproof wall. The fuel gas supply device for a fuel cell system according to claim 1. 3. The fuel gas supply device for a fuel cell system according to claim 1, wherein a soundproof material is interposed between the first soundproof wall and the injector. 4. The fuel gas supply for a fuel cell system according to claim 2 or 3, further comprising a pump for pumping the fuel off gas to the ejector, wherein the pump is attached to a lower surface of the second soundproof wall. apparatus. The pump includes a pump unit for sucking and discharging the fuel off-gas and a drive unit for driving the pump unit, and the pump is attached to the second soundproof wall via the pump unit. The fuel gas supply device for a fuel cell system according to claim 4. The pump includes a pump unit for sucking and discharging the fuel off-gas and a drive unit for driving the pump unit, and the pump is attached to the second soundproof wall via the drive unit. The fuel gas supply device for a fuel cell system according to claim 4. A buffer case for reducing pulsation of high-pressure fuel gas is further provided, and the buffer case is attached to an upper surface side of the first soundproof wall so as to cover an outer periphery of the soundproof cover, and the fuel gas is attached to the buffer case. The fuel gas supply device for a fuel cell system according to any one of claims 1 to 6, wherein an introduction hole for introducing the gas into the interior is provided. A fuel gas supply device for a fuel cell system that supplies fuel gas to a fuel cell constituting the fuel cell system, and mixes fuel off-gas discharged from the fuel cell with the fuel gas and circulates the fuel gas into the fuel cell. ,
An ejector for mixing the fuel gas and the fuel off-gas;
Injecting and supplying the fuel gas to the ejector, and an injector provided to adjust the flow rate of the fuel gas;
A plate-shaped first soundproof wall having the injector attached to the upper surface;
A cover attached to the upper surface of the first soundproof wall so as to cover the outer periphery of the injector;
A partition provided so as to divide the internal space of the cover into a storage chamber for storing the injector and a buffer chamber for introducing the fuel gas;
A communication hole that is provided in the partition and forms a passage for supplying fuel to the injector;
A fuel gas supply device for a fuel cell system, comprising: an introduction hole provided in the cover for introducing the fuel gas into the buffer chamber. 7. The system according to claim 4, wherein the first soundproof wall and the second soundproof wall are disposed between the injector and the pump in order to absorb vibrations from the injector and the pump. The fuel gas supply device of the fuel cell system according to claim 1.

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