JP5845977B2 - Duct coupling device - Google Patents

Description

  The present invention relates to a duct coupling device in which a gasket is interposed between ducts through which a gas such as high-temperature steam or gas flows.

  In recent years, expanded graphite gaskets, gaskets based on other inorganic materials, and the like have been used as heat-resistant gaskets for high-temperature gases of about 300 ° C to 400 ° C.

  For example, in the technique disclosed in Patent Document 1, the gasket has a structure that is mounted with at least a plurality of sets of bolts and nuts.

Japanese Patent Laying-Open No. 2005-240956

  However, in the technology disclosed in Patent Document 1, such a high-temperature gas gasket is flexible and has a soft surface. Therefore, in order to mount the gasket at a predetermined surface pressure, a plurality of bolts are used. The nut is gradually tightened with respect to the bolt, and tightening of the nut with respect to the bolt per pair requires about 2 to 3 times. Therefore, in order to perform a predetermined mounting of one gasket, there is a problem that a complicated operation is required since the tightening of the nuts per set is performed two or three times with a plurality of sets of nuts. In addition, if the tightening of the nuts to the bolts is uneven, the gasket cannot obtain a predetermined surface pressure and cannot secure a sealing property.

  The present invention has been made in view of the above problems, and adjustment of tightening of a nut with respect to a bolt in order to couple a duct with a gasket in which a gasket is uniformly mounted with a predetermined surface pressure by bolts and nuts. It is an object of the present invention to provide a duct coupling device that can reduce the labor of the operation.

In order to solve the above problems, a duct coupling device according to claim 1 is a duct coupling device that couples a first duct and a second duct through which a high-temperature fluid flows with a gasket interposed therebetween,
A first flange provided at the end of the first duct so as to extend outward from the opening of the flow path;
A fitting shaft portion protruding from the first flange in a direction perpendicular to the first flange and away from the first duct, and having a fitting diameter between a predetermined length from the contact surface of the first flange; And a tapered portion having a diameter that gradually decreases from the contact surface of the first flange beyond the predetermined length, and a male screw portion in which a male screw into which a nut is screwed is engraved on the tip side. A plurality of connecting bolts arranged to surround the opening;
A second flange provided at the end of the second duct so as to extend outward from the opening of the flow path;
Formed on the contact surface side of the second flange so that when the first flange and the second flange approach each other, the taper portion contacts and the distance between the contact surfaces facing each other is regulated. A tapered hole portion, and a through hole portion formed in the second flange subsequent to the tapered hole portion so that the male screw portion of the connection bolt penetrates, and the second flange includes the plurality of the plurality of tapered hole portions. A connection hole formed at a position facing the connection bolt;
A plurality of fitting holes that are formed at positions facing the plurality of connecting bolts and are fitted to the fitting shaft portion are formed, and the plurality of fitting holes are fitted to the plurality of connecting bolts, The first flange and the second flange are interposed between opposing contact surfaces, and when the nut is screwed into the plurality of male screws, the first flange and the second flange approach each other. comprising a gasket that is compressed in the thickness direction is pressed by the contact surface facing the flange and a second flange, and
The second duct is provided in a hot module of the fuel cell system, and the opening opens toward the back side of the fuel system to lead out stack off gas and extends outward from the opening in the vertical direction. Is a capacitor duct provided with the second flange,
The first duct is a duct provided in a main body of a heat exchanger connected to a hot module of the fuel cell system, and the opening is a front surface of the fuel system in a state where the heat exchanger is attached to the condenser duct. The stack off gas is introduced by opening toward the side, and the first flange is provided so as to extend outward from the opening in the vertical direction;
With the heat exchanger attached to the capacitor duct, the plurality of fitting holes are fitted into the plurality of connecting bolts that protrude toward the front side of the fuel cell system, and the gasket is held by the first flange. The plurality of connection bolts are inserted into the connection holes from the back side of the fuel cell system, the nuts are fastened to the plurality of male screws from the front side of the fuel cell system, and the gasket is connected to the first flange. The gist is to press the contact surface with the second flange .

To solve the above problems, the duct coupling device according to claim 2, in claim 1, wherein the first flange in a state of mounting the heat exchanger to the condenser duct, the plurality of connecting bolts the fuel cell system It is inclined to incline upward toward the front side of
The gist is that the second flange provided in the capacitor duct is also inclined at the same angle as the first flange.

According to the invention of the duct coupling device according to claim 1, the nut is screwed into the connecting bolt projecting from the first flange provided in the first duct, and is provided in the tapered portion of the connecting bolt and the second duct. The taper hole portion of the second flange is brought into contact with each other to obtain a metal touch between the first flange and the second flange, and the distance between the facing contact surfaces of the first flange and the second flange is determined by the metal touch. Since the tightening allowance of the gasket by each bolt is made uniform and the gasket can be mounted between the first flange and the second flange at a uniform and predetermined surface pressure, the first duct and the second duct can be coupled. The trouble of adjusting the tightening of the nut with respect to the bolt can be reduced. Further, the taper portion of the connecting bolt also functions as a guide, and since the fitting hole of the gasket can be guided to the fitting shaft portion of the connecting bolt, the gasket can be easily mounted without causing the gasket to be bitten. Even when the gasket is arranged on the back side of the second flange in a hidden position due to the presence of the second flange, that is, when the gasket is arranged at a position where visual work is difficult to perform the gasket mounting, Since the nut can be tightened and removed from the front side of the fuel cell system where the connecting bolt protrudes, maintenance such as installation, inspection and replacement of the heat exchanger is facilitated.

According to the invention of the duct coupling equipment according to claim 2, connecting bolts for inclined upward toward the front side of the fuel cell system can be prevented from falling from the connecting bolt of the gasket to a gasket There is no need to support the gasket by hand.

It is sectional drawing which shows the duct coupling device which concerns on embodiment of this invention. It is an enlarged view of the duct coupling device concerning an embodiment of the invention. It is the schematic which shows the outline of the fuel cell system which can apply the duct coupling device which concerns on embodiment of this invention.

  Embodiments according to the present invention will be described below with reference to the drawings. In the duct coupling device 10, as shown in FIG. 1, a first duct 11 and a second duct 12 through which a high-temperature gas flows are coupled by screwing a connecting bolt 14 and a nut 15 with a gasket 13 interposed. . A first flange 11b is provided at an end of the first duct 11 so as to extend outward from the opening 11a of the flow path. A second flange 12b is provided at the end of the second duct 12 so as to extend outward from the opening 12a of the flow path.

  As shown in FIG. 2, the connecting bolt 14 projects from the first flange 11 b in a direction perpendicular to the first flange 11 b and away from the first duct 11. The connecting bolt 14 has a fitting shaft portion 14a having a fitting diameter for a predetermined length from the contact surface of the first flange, and has a diameter as the distance from the contact surface of the first flange exceeds the predetermined length. Has a taper portion 14b that gradually decreases, and a male screw portion 14c in which a male screw is engraved with a diameter equal to or smaller than the minimum diameter of the taper portion 14b on the tip side. A plurality of connecting bolts 14 are arranged so as to surround the opening 11a. The connecting bolt 14 can be provided on the first flange 11b by brazing or the like. Further, the connecting bolt 14 is constituted by a stud bolt having a threaded portion at both ends, and can be provided by screwing to the first flange 11b.

  As shown in FIG. 2, the second flange 12 b is formed with a connection hole 12 c through which the connection bolt 14 is inserted at a position facing the plurality of connection bolts 14. When the first flange 11b and the second flange 12b approach each other, the connecting hole 12c comes into contact with the tapered portion 14b and restricts the distance between the contact surfaces facing each other of the first flange 11b and the second flange 12b. 12b has a tapered hole portion 12d formed on the contact surface side, and a through-hole portion 12e formed in the second flange 12b following the tapered hole portion 12d so that the male screw portion 14c of the connecting bolt 14 passes therethrough. .

  For the gasket 13, for example, expanded graphite or the like is used. As shown in FIG. 2, the gasket 13 has a plurality of fitting holes 13 a that are fitted with the fitting shaft portions 14 a of the connecting bolts 14 at positions facing the connecting bolts 14. The gasket 13 is interposed between the facing contact surfaces of the first flange 11b and the second flange 12b in a state where the plurality of fitting holes 13a are fitted to the plurality of connecting bolts 14. The gasket 13 is pressed by the opposing contact surfaces of the first flange 11b and the second flange 12b when the nut 15 is screwed into the plurality of male screw portions 14c and the first flange 11b and the second flange 12b approach each other. Thus, the first flange 11b and the second flange 12b become a metal touch by the contact between the tapered portion 14b and the tapered hole portion 12d.

  By the metal touch between the first flange 11b and the second flange 12b, the distance between the contact surfaces facing each other of the first flange 11b and the second flange 12b is regulated, and the gasket 13 is made uniform with a uniform tightening allowance. The first flange 11b and the second flange 12b can be mounted with a uniform and predetermined surface pressure while ensuring a sealing property, and are connected to the first duct 11 and the second duct 12.

  Next, a case where the coupling between the first duct 11 and the second duct 12 is released will be described. The first flange 11b and the second flange 12b are separated from each other by loosening the nuts 15 screwed into the male threaded portions 14c of the plurality of connecting bolts 14 and operating the connecting pins 14 in the direction in which they are removed from the second flange 12b. Thus, the coupling between the first duct 11 and the second duct 12 can be released.

  Next, an example in which the duct coupling device 10 is applied to a fuel cell system will be described with reference to FIGS. 1 and 2. The second duct 12 is provided at the bottom 31a of the casing of the hot module of the fuel cell system, and the opening 12a through which the stack-off gas, which is a high-temperature gas of 300 ° C. to 400 ° C., is led out (see FIG. 1 and FIG. 2 is a capacitor duct provided with a second flange 12b so as to open toward the right side of 2) and to extend outwardly from the opening 12a in the vertical direction.

  The first duct 11 is a heat exchanger duct provided in the casing 17a of the heat exchanger 17 connected to the hot module of the fuel cell system. In the heat exchanger duct 11, an opening 11 a into which the stack off gas is introduced in a state where the heat exchanger 17 is attached to the capacitor duct 12 opens toward the front side of the fuel cell system (left side in FIGS. 1 and 2). A first flange 11b is provided so as to extend outward from 11a in the vertical direction.

  The duct coupling relating to the mounting of the heat exchanger 17 to the condenser duct 12 will be described. A gasket 13 is formed by fitting a plurality of fitting holes 13a to a plurality of connecting bolts 14 protruding in the front direction of the fuel cell system (left direction in FIGS. 1 and 2) with the heat exchanger 17 attached to the capacitor duct 12. The first flange 11b is held. In the operation from the front side (left side in FIGS. 1 and 2) of the fuel cell system, the plurality of connection bolts 14 are inserted into the plurality of connection holes 12c of the second flange 12 from the rear side (right side in FIG. 1). Each nut 15 is fastened from the front side of the fuel cell system (left side in FIG. 1) to the male screws of the plurality of male screw portions 14c. By the fastening, the gasket 13 is pressed by the contact surface between the first flange 11b and the second flange 12b.

  The first flange 11b and the second flange 12b are made of metal by the contact between the tapered portion 14b of the connecting bolt 14 attached to the first flange 11b and the tapered hole portion 12d of the second flange 12b by screwing the nut 15. Touch. Due to the metal touch between the first flange 11b and the second flange 12b, the gasket 13 is uniform and has a predetermined surface pressure, and the heat exchanger duct 11 and the capacitor duct 12 are coupled with each other while ensuring sealing performance. As a result, the attachment of the heat exchanger 17 to the condenser duct 12 is completed.

  Next, the case where the heat exchanger 17 is removed from the condenser duct 12 will be described. In the operation from the front side (the left side in FIGS. 1 and 2) of the fuel cell system, the nuts 15 screwed into the male screw portions 14c of the plurality of connecting bolts 14 are loosened, and the connecting pins 14 are connected to the second flange. By operating in the direction in which 12b is pulled out, the first flange 11b and the second flange 12b are separated from each other, and the coupling between the heat exchanger duct 11 and the condenser duct 12 can be released. As a result, the heat exchanger 17 can be removed from the condenser duct 12.

  Further, the first flange 11b and the second flange 12b can be configured as follows. In the state where the heat exchanger 17 is attached to the condenser duct 12, the first flange 11b has a plurality of connecting bolts 14 upward toward the front side of the fuel cell system (left side in FIGS. 1 and 2) as shown in FIG. Tilt. And the 2nd flange 12b provided in the capacitor | condenser duct 12 can also be comprised by the same angle inclination as the 1st flange 11b, as shown in FIG. According to this configuration, since the fitting hole 13a of the gasket 13 is passed through the connecting bolt 14 whose tip is directed upward and the gasket 13 is supported by the connecting bolt 14, the fall of the gasket 13 from the connecting bolt 14 is prevented. This eliminates the need to support the gasket 13 by hand when mounting the gasket 13.

  Hereinafter, a fuel cell system to which the duct coupling device 10 can be applied will be described with reference to FIG. This fuel cell system includes a box-shaped housing 20, a hot module 30, an exhaust heat recovery system 40, an inverter device 50, and a control device 60.

  The hot module 30 includes a casing 31, an evaporation unit 32, a reforming unit 33, and a fuel cell 34. An evaporation unit 32, a reforming unit 33, a fuel cell 34, and a combustion unit 36 are disposed in the casing 31.

  The evaporating unit 32 is heated by a combustion gas to be described later, evaporates the supplied reforming water to generate water vapor, and preheats the supplied reforming raw material. The evaporation section 32 mixes the steam generated in this way and the preheated reforming raw material and supplies the mixture to the reforming section 33. The reforming raw materials include gas fuels for reforming such as natural gas and LP gas, and liquid fuels for reforming such as kerosene, gasoline, and methanol. In this embodiment, natural gas will be described.

  One end (lower end) of the water supply pipe 71 disposed in the water tank 73 is connected to the evaporation unit 32, and the reforming water is transferred from the water tank 73 to the evaporation unit 32 by the reforming water pump 71a. To be supplied.

  Further, the reforming material from the reforming material supply source Gs is supplied to the evaporation section 32 via the reforming material supply pipe 72. The supply source Gs is, for example, a gas supply pipe for city gas or a gas cylinder for LP gas. A raw material pump 72 a is provided in the reforming raw material supply pipe 72, and the raw material pump 72 a supplies fuel (reforming raw material) to the fuel cell 34.

  The reforming unit 33 is heated by a combustion gas to be described later and supplied with heat necessary for the steam reforming reaction, so that the reformed gas is converted from the mixed gas (reforming raw material, steam) supplied from the evaporation unit 32. Is generated and derived. The reforming section 33 is filled with a catalyst (for example, Ru or Ni-based catalyst), and the mixed gas reacts with the catalyst and is reformed to generate hydrogen gas and carbon monoxide gas (so-called so-called). Steam reforming reaction). At the same time, a so-called carbon monoxide shift reaction occurs in which carbon monoxide generated in the steam reforming reaction reacts with steam to transform into hydrogen gas and carbon dioxide. These generated gases (so-called reformed gas) are led out to the fuel electrode of the fuel cell 34. The reformed gas contains hydrogen, carbon monoxide, carbon dioxide, steam, unreformed natural gas (methane gas), and reformed water (steam) that has not been used for reforming. The steam reforming reaction is an endothermic reaction, and the carbon monoxide shift reaction is an exothermic reaction.

  The fuel cell 34 is configured by laminating a fuel electrode, an air electrode (oxidant electrode), and a plurality of cells 34a made of an electrolyte interposed between the two electrodes. The fuel cell of this embodiment is a solid oxide fuel cell, and uses zirconium oxide, which is a kind of solid oxide, as an electrolyte. Hydrogen, carbon monoxide, methane gas, etc. are supplied to the fuel electrode of the fuel cell 34 as fuel. The operating temperature is about 400 ° C to 1000 ° C. Not only hydrogen but also natural gas and coal gas can be used directly as fuel. In this case, the reforming unit 33 can be omitted.

  On the fuel electrode side of the cell 34a, a fuel flow path 34b through which the reformed gas as the fuel flows is formed. An air flow path 34c through which air (cathode air) that is an oxidant gas flows is formed on the air electrode side of the cell 34a.

  The fuel cell 34 is provided on the manifold 35. The reformed gas from the reforming unit 33 is supplied to the manifold 35 via the reformed gas supply pipe 73. The lower end (one end) of the fuel flow path 34b is connected to the fuel outlet of the manifold 35, and the reformed gas led out from the fuel outlet is introduced from the lower end and led out from the upper end. . Cathode air delivered by the cathode air blower 74a is supplied via a cathode air supply pipe 74, introduced from the lower end of the air flow path 34c, and led out from the upper end.

In the fuel cell 34, power generation is performed by the fuel supplied to the fuel electrode and the oxidant gas supplied to the air electrode. That is, oxide ions (O ²⁻ ) generated at the air electrode permeate the electrolyte and react with hydrogen at the fuel electrode to generate electrical energy. Therefore, the reformed gas and the oxidant gas (air) that have not been used for power generation are derived from the fuel flow path 34b and the air flow path 34c.

  Then, the reformed gas (anode off gas) that is derived from the fuel flow path 34b and the air flow path 34c and is not used for power generation enters the combustion space 36 between the fuel cell 34 and the evaporation section 32 (reforming section 33). The oxidant gas (cathode off-gas) that has not been used for power generation is combusted, and the evaporation part 32 and the reforming part 33 are heated by the combustion gas (flame 37). Furthermore, the inside of the hot module 30 is heated to the operating temperature. Thereafter, the combustion gas is exhausted as the stack off gas to the outside of the casing 31 of the hot module 30 through the capacitor duct 12 attached to the bottom 31a of the casing 31 of the hot module 30.

  The exhaust heat recovery system 40 is an exhaust heat recovery system that recovers and stores exhaust heat in stored hot water by exchanging heat between the exhaust heat of the fuel cell 34 and the stored hot water. The exhaust heat recovery system 40 exchanges heat between a hot water tank 41 for storing hot water, a hot water circulation line 42 for circulating the hot water, and a stack off gas of 300 ° C. to 400 ° C. from the hot module 30 and the hot water. And a heat exchanger 17 for performing the above. A hot water circulation pump 42 a serving as a hot water circulation means is provided on the hot water circulation line 42.

  The heat exchanger 17 is a heat exchanger in which the stack off gas exhausted from the hot module 30 is supplied and the hot water stored in the hot water storage tank 41 is supplied to exchange heat between the stack off gas and the hot water. The heat exchanger 17 is provided in the lower part of the hot module 30.

  The heat exchanger 17 includes a casing 17a. A heat exchanger duct 11 is provided on the upper portion of the casing 17a. The heat exchanger duct 11 is provided at the bottom 31a of the casing 31 of the hot module 30 and is connected to the condenser duct 12 from which the stack off gas is led out by the duct coupling device 10 as described above with reference to FIG. The description regarding the duct coupling is omitted here. A condensed water supply pipe 77 connected to the deionizer 74 is connected to the bottom of the casing 17a. Inside the casing 17a, a heat exchange part (condensing part) 17b connected to the hot water circulation line 42 is disposed.

  In the heat exchanger 17 configured as described above, the stack off gas from the hot module 30 is introduced into the casing 17a through the condenser duct 12 and the heat exchanger duct 11, and the heat exchange section 17b through which the hot water is circulated. When passing through, heat is exchanged with the hot water and condensed and cooled. The condensed stack off gas is discharged to the outside through the exhaust pipe 76 through the exhaust port 20a. Condensed condensed water is supplied to the deionizer 74 through the condensed water supply pipe 77 (falls by its own weight). On the other hand, the hot water stored in the heat exchange unit 17b is heated and discharged.

  The fuel cell system also includes a water tank 73 and a pure water device 74. The water tank 73 stores the pure water derived from the pure water device 74. The deionizer 74 communicates with the water tank 73 through a pipe 78, and the deionized water in the deionizer 74 is led out to the water tank 73 through the pipe 78.

  Further, the fuel cell system includes an inverter device 50. Inverter device 50 receives a DC voltage output from fuel cell 34, converts it to a predetermined AC voltage, and outputs it to power supply line 52 connected to AC system power supply 51 and external power load 53; The second function is to input an AC voltage from the system power supply 51 through the power supply line 52, convert the voltage into a predetermined DC voltage, and output the converted voltage to the auxiliary device or the control device 60.

  The system power supply (or commercial power supply) 51 supplies power to the power load 53 via a power supply line 52 connected to the system power supply 51. The fuel cell 24 is connected to a power supply line 52 via an inverter device 50. The power load 53 is a load driven by an AC power supply, and is an electrical appliance such as a dryer, a refrigerator, or a television.

  The auxiliary equipment includes motor-driven pumps 72a and 42a for supplying reforming raw material, water, and air to the hot module 30, and a cathode air blower 74a. This auxiliary machine is driven by a DC voltage.

  The control device 60 of the fuel cell system includes a microcomputer (not shown), and the microcomputer includes an input / output interface, a CPU, a RAM, and a ROM (all not shown) connected via a bus. Yes. The CPU is operating the fuel cell system. The RAM temporarily stores variables necessary for executing the program, and the ROM stores the program.

  The front side of the fuel cell system is the left side in FIG. 3, and the back side of the fuel cell system is the right side in FIG. The exhaust heat recovery system 40 exists on the back side (right side in FIG. 3) of the casing 20 of the fuel cell system, and there is no available space. Further, the inside of the casing 20 of the fuel cell system includes a hot module 30, a heat exchanger 17, an inverter 50, a control device 60, a water tank 73 and a deionizer 74, pumps 72a and 42a, a cathode air blower 74a, and the like. Wiring and piping are provided, and from the front side of the housing 20 (left side in FIG. 3), the heat exchanger 17 and a space in which tools can be taken in and out are arranged toward the duct coupling device 10. Yes. Accordingly, the heat exchanger duct 11 and the condenser duct 12 are coupled from the front side of the housing 20 (left side in FIG. 3), that is, from the front side of the fuel system, and maintenance such as installation, inspection, and replacement of the heat exchanger 17 can be performed. it can.

  DESCRIPTION OF SYMBOLS 10 ... Duct coupling apparatus, 11 ... 1st duct (heat exchanger duct), 11a ... Opening, 11b ... 1st flange, 12 ... 2nd duct (capacitor duct), 12a. ..Opening, 12b ... second flange, 12c ... connection hole, 12d ... tapered hole, 13 ... gasket, 13a ... fitting hole, 14 ... connection bolt, 14a ..Fitting shaft part, 14b ... Taper part, 14c ... Male thread part, 15 ... Nut, 31a ... Bottom part of casing of hot module of fuel cell system, 17 ... Heat exchanger

Claims (2)

A duct coupling device for coupling a first duct and a second duct through which a high-temperature fluid flows with a gasket interposed therebetween,
A first flange provided at the end of the first duct so as to extend outward from the opening of the flow path;
A fitting shaft portion protruding from the first flange in a direction perpendicular to the first flange and away from the first duct, and having a fitting diameter between a predetermined length from the contact surface of the first flange; And a tapered portion having a diameter that gradually decreases from the contact surface of the first flange beyond the predetermined length, and a male screw portion in which a male screw into which a nut is screwed is engraved on the tip side. A plurality of connecting bolts arranged to surround the opening;
A second flange provided at the end of the second duct so as to extend outward from the opening of the flow path;
Formed on the contact surface side of the second flange so that when the first flange and the second flange approach each other, the taper portion contacts and the distance between the contact surfaces facing each other is regulated. A tapered hole portion, and a through hole portion formed in the second flange subsequent to the tapered hole portion so that the male screw portion of the connection bolt penetrates, and the second flange includes the plurality of the plurality of tapered hole portions. A connection hole formed at a position facing the connection bolt;
A plurality of fitting holes that are formed at positions facing the plurality of connecting bolts and are fitted to the fitting shaft portion are formed, and the plurality of fitting holes are fitted to the plurality of connecting bolts, The first flange and the second flange are interposed between opposing contact surfaces, and when the nut is screwed into the plurality of male screws, the first flange and the second flange approach each other. comprising a gasket that is compressed in the thickness direction is pressed by the contact surface facing the flange and a second flange, and
The second duct is provided in a hot module of the fuel cell system, and the opening opens toward the back side of the fuel system to lead out stack off gas and extends outward from the opening in the vertical direction. Is a capacitor duct provided with the second flange,
The first duct is a duct provided in a main body of a heat exchanger connected to a hot module of the fuel cell system, and the opening is a front surface of the fuel system in a state where the heat exchanger is attached to the condenser duct. The stack off gas is introduced by opening toward the side, and the first flange is provided so as to extend outward from the opening in the vertical direction;
With the heat exchanger attached to the capacitor duct, the plurality of fitting holes are fitted into the plurality of connecting bolts that protrude toward the front side of the fuel cell system, and the gasket is held by the first flange. The plurality of connection bolts are inserted into the connection holes from the back side of the fuel cell system, the nuts are fastened to the plurality of male screws from the front side of the fuel cell system, and the gasket is connected to the first flange. A duct coupling device pressed by a contact surface with the second flange . In a state where the heat exchanger is attached to the capacitor duct, the first flange is inclined such that the plurality of connecting bolts are inclined upward toward the front side of the fuel cell system,
The duct coupling device according to claim 1, wherein the second flange provided in the capacitor duct is also inclined at the same angle as the first flange.

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