JP5038978B2 - Piping connection structure of fuel cell system - Google Patents

Description

  The present invention relates to a pipe connection structure of a fuel cell system having a refrigerant circuit.

  In a refrigerant circuit that cools a fuel cell with a refrigerant, a tube is provided as a conduit through which the refrigerant flows. For example, by tightening a connection portion of the tube with an annular band to ensure a predetermined tightening force, the tube The sealing property of the refrigerant circulating in the interior at a relatively high pressure is maintained.

  With regard to this type of refrigerant circuit, for example, in FIG. 1 of Patent Document 1 proposed by the present applicant, a pump, an ion exchanger, and the like are interposed in the middle of the piping, and the right side of the vehicle body is moved rearward from the radiator in front of the vehicle body. A cooling system is disclosed in which a water pipe extending toward the water pipe is provided and the fuel cell is cooled by water circulating through the water pipe.

Patent Document 2 discloses a quick connector for connecting a pipe body and a resin tube, which is a counterpart member, with respect to gasoline fuel piping of an automobile.
JP 2001-71753 A JP-A-2005-214240

  By the way, when performing fuel cell maintenance work or ion exchanger exchange work that is performed regularly, it is necessary to loosen the tightened band and remove the tube connected to the pipe. There are problems such as the pipe connection port creeping due to aging, etc., or the tube connection port of the tube is fixed to the pipe connection part due to the tightening force of the band, and it can not be easily detached, etc. The entire pipe that was used from the beginning was replaced with a new pipe.

  Thus, in the prior art, it is difficult to reuse the pipes that have been used conventionally due to the above-mentioned problems, and the replacement work for replacing all the pipes that have been used conventionally with new pipes is required. There is a problem that maintenance costs increase with the purchase of new piping.

  The present invention has been made in view of the above points, and by achieving the reuse of the pipes that have been used conventionally, the fuel cell is capable of improving the maintainability and reducing the maintenance cost. It aims at providing the piping connection structure of a system.

  In addition, Patent Document 1 discloses a water pipe for circulating cooling water, but the pipe connection structure of the water pipe is not specifically disclosed or suggested. It is unknown. Further, the quick connector disclosed in Patent Document 2 is used for gasoline fuel piping of automobiles, and there is no disclosure or suggestion about the point of application to a refrigerant circuit pipeline. Furthermore, even in consideration of Patent Document 1 and Patent Document 2, the technical idea of providing a quick connector at a connection portion between the pipes constituting the refrigerant circuit of the fuel cell system, and the pipes that have been conventionally used are reused. No technical idea is disclosed or suggested.

To achieve the above object, the present invention provides a fuel cell stack, a radiator that functions as a cooler for cooling the refrigerant, a pump that circulates the refrigerant, a switching valve that switches a passage through which the refrigerant flows, A pipe connection structure for use in a refrigerant circuit of a fuel cell system mounted on a vehicle, comprising: an ion exchanger that performs ion exchange of refrigerant; and a refrigerant passage composed of a plurality of pipes. A first joint member and a second joint member which are provided at a branching portion of the passage and detachably connect the refrigerant passage; and the fuel disposed in a second frame of the vehicle, which is an underfloor portion of the vehicle. A fuel cell unit including a battery stack and the ion exchanger; and a motor unit including the switching valve and the pump, wherein the first joint member is connected to the radiator. A first port to which the first tube is connected, a second port to be used as a bypass passage for bypassing the radiator and connected to the second tube connected to the pump, and a connection pipe between the fuel cell stack A third port to which a third tube is connected, and the second joint member includes a first port to which a fifth tube that is a connection pipe to the pump is connected, and the fuel cell stack. A second port to which a sixth tube that is a connection pipe is connected, and a third port to which a seventh tube that is a connection pipe to the ion exchanger is connected, and the first joint member and the first port The two joint members are provided so as to be substantially flush with the bottom surface of the first frame disposed in the lower floor portion of the motor room of the vehicle, and the fuel cell unit and the motor unit Characterized in that it is arranged in the boundary portion.

According to the present invention, by Rukoto provided with the first joint member and a second coupling member for connecting the refrigerant passage detachably to the branches of the refrigerant passage, the entire pipe as in the prior art to be replaced with a new pipe This eliminates the need for the pipes, and makes it possible to improve the maintainability by effectively using the pipes that have been used conventionally. Further, according to the present invention, the first joint member and the second joint member are disposed at the boundary portion between the fuel cell unit and the motor unit, so that separation and connection between the fuel cell unit and the motor unit are facilitated, Maintenance can be further improved.

In the present invention, the first joint member and the second joint member are each provided with first to third ports to which various tubes are connected, so that various devices and pipes (tubes) can be efficiently attached and detached. can do.

Furthermore, in the present invention, the first joint member and the second joint member are convenient because they are arranged together on either the motor unit side or the fuel cell unit side, and the workability of pipe connection is improved. be able to.

Furthermore, in the present invention, after the under cover is removed, the attachment / detachment operation with respect to various tubes can be easily performed through the first joint member and the second joint member attached at the visible position. it can.

Furthermore, the present invention can be easily attached and detached by the female connector and the male connector.

Furthermore, in the present invention, since the first joint member and the second joint member are formed of a resin material, it is possible to ensure good electrical insulation of the pipe itself with respect to the outside and reduce the weight of the entire pipe. In addition, cost reduction can be achieved. In addition, the first joint member and the second joint member have electrical insulation and are formed of a material with low ion elution, thereby ensuring electrical insulation at a high voltage site near the fuel cell stack. In addition, the electrical insulation of the refrigerant itself flowing through the refrigerant passage can be ensured. In addition, ion low elution means that it is hard to discharge | release ion to a refrigerant | coolant.

Furthermore, in the present invention, the pressure loss of the refrigerant in the refrigerant passage ( flow path connecting the second port and the third port) from the fuel cell stack to the pump is reduced to the refrigerant passage ( from the fuel cell stack to the radiator ) It is good to set large compared with the pressure loss of the refrigerant | coolant in the flow path which connects a 1st port and a 3rd port . That is, the pressure loss of the refrigerant passage toward the radiator is larger than the refrigerant passage toward the pump due to the pressure loss of the refrigerant in the radiator itself and the difference in the length of the pipes constituting the refrigerant passage. It may be set so as to facilitate distribution to the radiator side (first port side) . As a result, in the present invention, balance control can be performed by controlling the pressure loss of the refrigerant at each port of the first joint member .

Furthermore, in this invention, the 4th port connected to an ion exchanger is provided with respect to a 1st coupling member other than a 1st-3rd port, and piping connection with various apparatuses is integrated. Centralized piping is possible, and various devices and piping can be attached and detached more efficiently. In this case, the refrigerant circuit is configured including the ion exchanger, and the connecting portion of the pipe communicating with the ion exchanger is detachably connected, thereby simplifying the replacement work of the ion exchanger that needs to be periodically replaced. Can be accomplished.

Furthermore, in the present invention, the refrigerant discharge operation can be performed smoothly by discharging the refrigerant from the refrigerant discharge holes provided in the first joint member and the second joint member.

Still further, in the present invention, a detachable connection part of the female connector and the male connector is provided with a fitting state determination mechanism for determining whether the connection part is in a completely fitted state or an incompletely fitted state. It should be done. The operator can easily determine whether the female connector and the male connector are in a completely fitted state or an incompletely fitted state by the fitting state discriminating mechanism, thereby achieving simplification of management of the seal portion. can do.

  According to the present invention, it is possible to obtain a fuel cell system pipe connection structure capable of improving the maintainability and reducing the maintenance cost by achieving the reuse of the pipes used conventionally.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a circuit configuration diagram of a refrigerant circuit to which a pipe connection structure of a fuel cell system according to an embodiment of the present invention is applied.

<Configuration of refrigerant circuit>
As shown in FIG. 1, the refrigerant circuit 10 is a fuel cell that generates electric power by an electrochemical reaction between a fuel gas (for example, hydrogen gas) supplied to the anode and an oxidant gas (for example, air) supplied to the cathode. A stack 12, a radiator 14 that functions as a cooler for cooling the refrigerant, a circulation path 16 that circulates the refrigerant between the fuel cell stack 12 and the radiator 14, and a refrigerant provided in the circulation path 16 A pump 18 that circulates at a flow rate and a flow path switching valve 22 that is provided in a bypass path 20 that bypasses the radiator 14 and switches a flow path through which a refrigerant flows to either the circulation path 16 or the bypass path 20. Including. Instead of the flow path switching valve 22, a flow rate control valve for controlling the flow rate of the refrigerant may be used.

  The flow path switching valve 22 functions as a thermostat valve that is a temperature control mechanism that adjusts the flow rate of the refrigerant to the radiator 14 and adjusts the temperature of the refrigerant supplied to the fuel cell stack 12. Examples of the refrigerant circulating in the refrigerant circuit 10 include liquid refrigerants such as ethylene glycol and antifreeze, and fluorocarbon refrigerants such as Freon (registered trademark).

  The fuel cell stack 12 has a stack body having a substantially rectangular parallelepiped shape, and a refrigerant introduction for cooling the fuel cell stack 12 by circulating the refrigerant into the stack body is provided on the front surface (front side) of the stack body. A port 30a and a refrigerant outlet port 30b are provided. A branch passage 32 that branches from the upstream side of the circulation passage 16 and joins the downstream side is provided between the refrigerant introduction port 30a and the refrigerant outlet port 30b. The branch passage 32 includes, for example, cation exchange. An ion exchanger 34 filled with resin and anion exchange resin is provided.

  A first joint member 36 having a so-called quick connector is disposed at a junction of the circulation passage 16, the bypass passage 20, and the branch passage 32. The merging site is a downstream circulation passage 16 returning from the refrigerant outlet port 30b of the fuel cell stack 12 to the radiator 14, a bypass passage 20 communicating with the pump 18, and a downstream where the return refrigerant from the ion exchanger 34 circulates. The three passages including the side branch passage 32 are in communication with each other, and the first joint member 36 is disposed at a junction (intersection) of the three passages. Details of the first joint member 36 will be described later.

  A second joint member 37 having a so-called quick connector is disposed at a branch portion between the circulation passage 16 and the branch passage 32. The branch portion includes an upstream circulation passage 16 formed between the refrigerant introduction port 30a of the fuel cell stack 12 and the pump 18, and an upstream branch passage 32 through which the refrigerant supplied to the ion exchanger 34 is branched. These two passages are made up of portions branched from each other, and a second joint member 37 is disposed at a branch portion of the two passages. The details of the second joint member 37 will be described later.

  Further, as shown in FIG. 1, the refrigerant circuit 10 derives a drive signal for driving the pump 18 and a control for deriving a valve switching signal (valve operation control signal) to the flow path switching valve 22. An ECU (Electric Control Unit) 38 that functions as means is provided. The ECU 38 is constituted by an electronic control unit including a microcomputer including a RAM, a ROM, a CPU, an I / O port and the like (not shown).

<Configuration of first joint member>
FIG. 2 is a schematic configuration diagram of the first joint member, showing a state where the female connector portion and the male connector portion constituting the connector are detached.

  The first joint member 36 includes a joint body 40 having three large-diameter ports and one small-diameter port. A first port 46a and a second port 46b each having a large diameter are disposed at both ends of the joint body 40, and a first tube 48a through which refrigerant flows toward the radiator 14 is disposed in the first port 46a. A second tube 48b through which the refrigerant flows to the pump 18 is detachably connected to the second port 46b on the opposite side via the second connector 50b. The

  A band for tightening and fixing the outer peripheral surface of the connection portion of the first tube 48a and the second tube 48b having substantially the same inner diameter with a predetermined tightening force at a portion close to the first connector 50a and the second connector 50b. 52 are respectively mounted.

  Further, the joint body 40 is provided with a third port 46c having a large diameter and intersecting with an axis of the joint body 40 connecting the first port 46a and the second port 46b with an inclination of a predetermined angle. A third tube 48 c for circulating the return refrigerant derived from the refrigerant outlet port 30 b of the fuel cell stack 12 is directly connected to the third port 46 c via a band 52. In this way, the joint body 40 is provided with three-way paths when paying attention to the large-diameter first to third ports 46a to 46c.

  In this case, the third port 46c into which the return refrigerant from the fuel cell stack 12 is introduced is inclined by a predetermined angle with respect to the axis of the joint body 40 (a straight line connecting the first port 46a and the second port 46b). Thus, the balance between the pressure loss of the refrigerant led out to the radiator 14 side via the first port 46a and the pressure loss of the refrigerant led out to the pump 18 side via the second port 46b is controlled. Can do.

  That is, if the third port 46c is provided so as to be orthogonal to the axis of the joint body 40 connecting the first port 46a and the second port 46b (in the case of a complete T-shape). In the radiator 14 side (first port 46a side) and the pump 18 side (second port 46b side), substantially the same pressure loss occurs, but it is inclined by a predetermined angle with respect to the axis as in this embodiment. Thus, by providing the third port 46c, the pressure loss balance control can be performed so as to avoid the substantially same pressure loss and to suppress the pressure loss on the radiator 14 side compared to the pump 18 side. .

  In other words, in this embodiment, the pressure loss of the refrigerant in the refrigerant passage (circulation passage 16 including the bypass passage 20 in FIG. 1) from the fuel cell stack 12 to the pump 18 is directed from the fuel cell stack 12 to the radiator 14. The pressure loss is balanced by being set larger than the refrigerant pressure loss in the refrigerant passage (circulation passage 16 not passing through the bypass passage 20 in FIG. 1). The pressure loss of the refrigerant passage toward the radiator 14 is larger than the refrigerant passage toward the pump 18 due to the pressure loss of the refrigerant in the radiator 14 itself and the difference in the length of the pipe constituting the refrigerant passage. Is provided so as to be easily distributed to the radiator 14 side.

  Further, the joint body 40 is provided with a fourth port 46 d, and a fourth tube 48 d for circulating the return refrigerant from the ion exchanger 34 is directly connected to the fourth port 46 d through a band 53.

  A modification of the first joint member is shown in FIG. In the first joint member 36a according to this modification example, the first to third ports 46a to 46c are respectively distributed in the circumferential direction with respect to the joint body 40a, thereby disposing the first to third ports. Separation intervals of the first to third tubes 48a to 48c connected to 46a to 46c become substantially uniform, and attachment / detachment work is further facilitated.

<Configuration of second joint member>
The second joint member 37 has a joint body in which three ports are formed. As shown in FIG. 1, the joint body is provided with a first port 58a and a second port 58b, and a fifth tube through which the refrigerant fed from the pump 18 is circulated in the first port 58a. 48e is detachably connected via the third connector 50c. The second port 58b is connected to a sixth tube 48f for circulating the refrigerant toward the refrigerant introduction port 30a of the fuel cell stack 12.

  The joint body 54 is provided with a third port 58c. The third port 58c has a seventh tube 48g that branches from the upstream circulation passage 16 and supplies the refrigerant toward the ion exchanger 34. Connected.

  Note that the first joint member 36, the second joint member 37, and the first to seventh tubes 48a to 48g each have a predetermined strength and electrical insulation and low ion elution materials (for example, ions are difficult to be derived). Resin material, ceramic material, etc.). Further, the first joint member 36 and the like have electrical insulation properties and are formed of a material with low ion elution, so that electrical insulation properties at a high voltage site near the fuel cell stack 12 can be secured. In addition, the electrical insulation of the refrigerant itself flowing through the refrigerant passage can be ensured. In addition, ion low elution means that it is hard to discharge | release ion to a refrigerant | coolant.

<Configuration of each connector>
The first to third connectors 50a to 50c provided in the first joint member 36 and the second joint member 37, respectively, will be described in detail below. Since the first to third connectors 50a to 50c are composed of the same components, for convenience of explanation, only the first connector 50a is described in detail, and descriptions of the second connector 50b and the third connector 50c are omitted. .

  As shown in FIG. 2, the first connector 50a includes a female connector portion 62 having an insertion portion (not shown) that is fitted into the end opening of the first tube 48a, and the female connector provided on the joint body 40 side. And a male connector portion 64 connected to the portion 62. A seal ring (for example, an O-ring) (not shown) is attached to the inner wall surface of the opening of the female connector portion 62 via an annular groove, and the seal ring is connected between the male connector portion 64 and the female connector portion 62. The part is hermetically or liquid tightly sealed.

  In addition, in this embodiment, although demonstrated using three connectors (quick connector) which consist of the 1st-3rd connectors 50a-50c, it is not limited to this, For example, the modification of FIG. As shown in the refrigerant circuit 10a, two connectors 50d and 50e can be used.

  In this case, in the refrigerant circuit 10a according to the modified example, the number of parts can be reduced to reduce the cost, and the number of connection points can be reduced, so that the maintenance work can be performed more easily. Furthermore, the connector may be appropriately provided at a portion where the tube is directly connected to each port. Furthermore, the connector may be appropriately provided only in a portion requiring maintenance. In other words, the connector may be appropriately provided in a piping portion where a member requiring maintenance can be easily removed.

<Installation Position and Installation Structure of First Joint Member and Second Joint Member in Refrigerant Circuit>
FIG. 5 is a schematic plan view of the refrigerant circuit, and FIG. 6 is a schematic side view of the refrigerant circuit.
Next, the installation relationship (arrangement relationship) between the first joint member 36 and the second joint member 37 will be described below. The first joint member 36 is provided on a first frame 78 constituting the motor unit 76. The motor unit 76 is provided in a motor room in front of the vehicle body and includes at least components such as a motor 80 driven by electric power generated in the fuel cell stack 12, a pump 18, and a flow path switching valve 22. The first frame 78 is disposed at an under floor portion of the motor room of the fuel cell vehicle.

  The motor unit 76 is disposed at a position corresponding to an engine room in an engine specification vehicle below a bonnet (not shown), and is provided at a place where a motor 80 for driving a fuel cell vehicle is attached. The radiator 14 is attached to a vehicle body (not shown) of the fuel cell vehicle, but may be attached to the motor unit 76.

  The first joint member 36 including the first connector 50a and the second connector 50b is provided on the first frame 78, so that the bottom surface of the first frame 78 is substantially the same as the bottom surface of the fuel cell vehicle. It arrange | positions so that it may become one, and is arrange | positioned in the lowermost part in the refrigerant circuit 10. FIG. In other words, the attachment / detachment part of the first connector 50 a and the second connector 50 b constituting the first joint member 36 is provided in the lowermost part in the refrigerant circuit 10.

  The second joint member 37 is provided on the second frame 86. In this case, like the first joint member 36, the second joint member 37 is disposed so as to be substantially flush with the bottom surface of the first frame 78, and is disposed at the lowermost part in the refrigerant circuit 10.

  As shown in FIG. 6, a single under cover 84 is disposed on the lower side of the refrigerant circuit 10, and this under cover 84 is, for example, a body of a fuel cell vehicle via a removable member such as a bolt. The first frame 78 and the second frame 86 arranged at the lower part of the passenger compartment of the body are detachably provided. In this case, since the first to third connectors 50a to 50c are disposed at a boundary portion between the motor unit 76 and a fuel cell unit 100 described later, the first to third connectors 50a to 50c are passed through the opening from which the under cover 84 is removed. The three connectors 50a to 50c can be visually checked, and the detachability of the first to third connectors 50a to 50c can be improved.

  Thus, in the present embodiment, after removing the under cover 84 at the lower part of the floor, the first joint member 36 and the second joint member 37 disposed at the lowermost part in the refrigerant circuit 10 are operated to operate the first to first parts. By releasing the connection of the three connectors 50a to 50c, it is possible to easily perform the pipe tube disconnecting operation and improve the maintainability.

  Moreover, in this embodiment, the attachment part of each connector provided in the 1st joint member 36 and the 2nd joint member 37 is provided in the lowest part in the refrigerant circuit 10, Therefore A piping tube is connected via each said connector. When separated, the refrigerant remaining in the piping tube can be suitably discharged to the outside. In other words, by disposing each connector at the lowermost part in the refrigerant circuit 10, each connector provided with a detachable piping tube can be used as a discharge mechanism.

  Furthermore, in the present embodiment, a drain hole (refrigerant discharge hole) (not shown) is provided in the joint body 40 of the first joint member 36 and the second joint member 37, and the drain hole is closed by a blind plug. Good. For example, by removing the blind plug from the joint body 40 during maintenance, the refrigerant in the pipe tube can be discharged to the outside through the drain hole without removing the pipe tube via the connector.

  Furthermore, in this embodiment, the fuel cell unit 100 including the fuel cell stack 12 supported by the second frame 86, the ion exchanger 34, and the like is disposed in the lower part of the passenger compartment of the fuel cell vehicle.

  In this case, the first joint member 36 and the second joint member 37 are disposed between the motor unit 76 and the fuel cell unit 100 and on a separation boundary line that is a separation site of the piping tube. In addition, it is convenient that the first joint member 36 and the second joint member 37 are arranged together on either the motor unit 76 side or the fuel cell unit 100 side.

  Furthermore, in the present embodiment, after the under cover 84 is removed, the piping tubes (the third tube 48c, the fourth tube 48d, the sixth tube 48f, and the seventh tube 48g detached from the first to third connectors 50a to 50c). ), And the entire fuel cell unit 100 having the fuel cell stack 12 and the ion exchanger 34 mounted on the second frame 86 can be exchanged for each frame. This can be further improved.

<Mechanism for determining connector mating state>
Fig.7 (a) is a side view which shows the perfect fitting state of a female connector part and a male connector part, FIG.7 (b) is a side view which shows an incomplete fitting state.

  When the female connector portion 62 and the male connector portion 64 constituting each connector are mounted, the female connector portion 62 and the male connector portion 64 are coaxially positioned and completely fitted (completely fitted) Or the axial line T2 of the female connector part 62 and the axial line T1 of the male connector part 64 do not coincide with each other and are located in different axes and are incompletely fitted (incompletely fitted) It is necessary to confirm whether it is in the combined state.

  In this case, in order to visually determine the incompletely fitted state, it is necessary to closely monitor the connection part of the connector. By simply discriminating between the completely fitted state and the incompletely fitted state, the seal part Simplification of management is required.

  Therefore, in this embodiment, when the female connector part 62 and the male connector part 64 are attached, a fitting state determination mechanism that visually recognizes and determines a complete fitting state and an incomplete fitting state is provided. As shown in FIG. 2, the fitting state determination mechanism is configured by a marking 102 provided on the outer peripheral surface of the male connector portion 64, for example.

  The shape of the marking 102 is indicated by a star shape in FIG. 2, but is not limited to this, for example, a polygon such as a circle, a triangle, or a rectangle, a composite shape thereof, or an axis Various shapes such as a line (not shown) along the direction and a line along the circumferential direction are included.

  As shown in FIG. 7A, in the fully fitted state, the axis T2 of the female connector portion 62 and the axis T1 of the male connector portion 64 coincide with each other in a straight line, and the outer periphery of the male connector portion 64 at the mounting site. The marking 102 provided on the surface is completely covered by the female connector portion 62, and the marking 102 cannot be viewed from the outside. As a result, the operator cannot easily see the marking 102 from the outside, and can easily determine that the connector is mounted in a completely fitted state.

  On the other hand, as shown in FIG. 7B, in the incompletely fitted state, the axis T2 of the female connector 62 and the axis T1 of the male connector 64 are in a different axial state, and the female connector 62 The marking 102 provided on the outer peripheral surface of the male connector portion 64 is exposed to the outside without being covered with the female connector portion 62, and the operator removes the marking 102. It can be easily visually recognized from the outside. As a result, the operator can easily determine that the connector is mounted in an incompletely fitted state by visually recognizing the marking from the outside.

  As described above, in this embodiment, it is possible to easily confirm the fitting state when the tubes are connected to each other via the connectors by the marking 102, and to simplify the management of the seal portion.

It is a circuit block diagram of the refrigerant circuit to which the piping structure of the fuel cell system which concerns on embodiment of this invention was applied. It is a schematic block diagram of the 1st coupling member which shows the state which the male connector part and female connector part which comprise a connector removed. It is a schematic block diagram which shows the modification of the said 1st coupling member. It is a circuit block diagram of the refrigerant circuit which concerns on a modification. FIG. 2 is a schematic configuration plan view of the refrigerant circuit shown in FIG. 1. It is a schematic structure side view of the refrigerant circuit shown by FIG. (A) is a side view which shows the complete fitting state of a female connector part and a male connector part, (b) is a side view which shows an incomplete fitting state.

Explanation of symbols

10, 10a Refrigerant circuit 12 Fuel cell stack 14 Radiator 18 Pump 22 Flow path switching valve (switching valve)
34 Ion exchanger 36 First joint member 37 Second joint member 40, 40a Joint body 46a-46d Port 48a-48g Tube 50a-50c, 50 Connector 58a-58c Port 62 Female connector part 64 Male connector part 76 Motor unit 84 Under Cover 78, 86 Frame 100 Fuel cell unit 102 Marking (fitting state discrimination mechanism)

Claims (10)

A fuel cell stack;
A radiator that functions as a cooler for cooling the refrigerant;
A pump for circulating the refrigerant;
A switching valve for switching a passage through which the refrigerant flows;
An ion exchanger that performs ion exchange of the refrigerant;
A refrigerant passage composed of a plurality of pipes;
A pipe connection structure used in a refrigerant circuit of a fuel cell system mounted on a vehicle,
A first joint member and a second joint member, which are provided at a branch portion of the refrigerant passage and detachably connect the refrigerant passage;
A fuel cell unit that is an underfloor part of the vehicle and includes the fuel cell stack and the ion exchanger disposed in a second frame of the vehicle;
A motor unit including the switching valve and the pump;
With
The first joint member is
A first port to which a first tube, which is a connecting pipe to the radiator, is connected;
A second port connected to a second tube used as a bypass passage for bypassing the radiator and communicating with the pump;
A third port to which a third tube that is a connection pipe to the fuel cell stack is connected;
Have
The second joint member is
A first port to which a fifth tube that is a connection pipe with the pump is connected;
A second port to which a sixth tube that is a connection pipe to the fuel cell stack is connected;
A third port to which a seventh tube which is a connection pipe to the ion exchanger is connected;
Have
The first joint member and the second joint member are provided so as to be substantially flush with a bottom surface of a first frame disposed in a lower floor portion of a motor room of the vehicle, and the fuel cell unit and the motor unit A fuel cell system pipe connection structure, wherein the pipe connection structure is arranged at a boundary portion between In the fuel cell system pipe connection structure according to claim 1 ,
The pipe connection structure of a fuel cell system, wherein the first joint member and the second joint member are arranged together in either the motor unit or the fuel cell unit. In the pipe connection structure of the fuel cell system according to claim 1 or 2 ,
Under the refrigerant circuit, an under cover detachably attached to the first frame and the second frame is provided ,
It said first coupling member and the second coupling member, the pipe connecting structure of a fuel cell system characterized mounted Rukoto the visible position through the opening for removal of the under cover. In the piping connection structure of the fuel cell system according to any one of claims 1 to 3,
The first to third tubes that constitute the refrigerant circuit and are connected to the first joint member and the fifth to seventh tubes connected to the second joint member are inserted into end openings. Have a female connector,
It said first coupling member and the second coupling member, the pipe connecting structure of a fuel cell system characterized Rukoto that having a male connector which is the detachably connected female connector and the end opening. In the fuel cell system pipe connection structure according to any one of claims 1 to 4 ,
The pipe connection structure of a fuel cell system, wherein the first joint member and the second joint member are formed of a resin material. In the fuel cell system pipe connection structure according to any one of claims 1 to 5 ,
The fuel cell system pipe connection structure, wherein the first joint member and the second joint member are formed of a material having electrical insulation and low ion elution. In the fuel cell system pipe connection structure according to any one of claims 1 to 6 ,
Said third port of said first coupling member is non-orthogonal to the virtual straight line connecting said first port with said second port, and in Rukoto provided inclined at a predetermined angle, and the second port fuel cell system flow path for communicating the third port is set to the first port and the third port so that the pressure loss of the refrigerant than the flow path communicating with increases and wherein Rukoto Piping connection structure. In the fuel cell system pipe connection structure according to any one of claims 1 to 7 ,
It said first coupling member further includes a fourth port fourth tube is connected pipes of the ion exchanger is connected,
The fuel cell system pipe connection structure, wherein the fourth port has a male connector, and the fourth tube is detachably connected. In the fuel cell system pipe connection structure according to any one of claims 1 to 8 ,
A pipe connection structure for a fuel cell system, wherein the first joint member and the second joint member are provided with a coolant discharge hole. In the pipe connection structure of the fuel cell system according to any one of claims 4 to 9 ,
The detachable connection part of the female connector and the male connector is provided with a fitting state determination mechanism for determining whether the connection part is in a completely fitted state or an incompletely fitted state. A fuel cell system piping connection structure.

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