JP2009286240A - Pipe connecting structure of fuel cell cooling system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve workability in connection of pipes and moderate stress concentration to the connecting part of the pipes. <P>SOLUTION: A unit includes a motor unit 76 having a pump 18 and the like, and a fuel cell unit 100 having a fuel cell stack 12 and the like. The unit is assembled and fixed to a fuel cell automobile via a first frame 78 and a second frame 86. In this state, a first to third connectors arranged in the vicinity of the fuel cell stack 12 and functioning as shaft seal mechanisms are provided for a first joint member 36 and a second joint member 37 for connecting pipes between different units. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  In the refrigerant circuit that directly cools the fuel cell with the refrigerant, a tube is provided as a conduit through which the refrigerant flows.For example, after the connection end portion that the tube opens is pressed against the pipe connection portion, By tightening the connecting portion of the tube with an annular band to ensure a predetermined tightening force, the sealing performance of the refrigerant circulating in the tube at a relatively high pressure is maintained.

  The refrigerant circuit includes a pump, a switching valve, and the like, and constitutes a cooling system that cools the fuel cell with cooling water that circulates through a pipe extending from a radiator disposed in front of the vehicle body. In this case, the pipe is formed of a rubber or resin tube in order to ensure electrical insulation.

Patent Document 1 includes a piping member having a piping main body formed of a fluororesin and a sleeve having a linear expansion coefficient lower than that of the piping main body provided at a connecting portion, and having a simple configuration and electrical insulation. An excellent fuel cell system is disclosed.
JP 2006-59652 A

  By the way, in a fuel cell vehicle equipped with a fuel cell, for example, a pump, a switching valve, etc. constituting a cooling system are mounted on a frame to form a unit, and a fuel cell stack constituting a cooling system is different from the frame. When unitized by mounting on another frame, it is necessary to connect pipes between the units mounted on the different assembled frames after fixing the different frames unitized to the fuel cell vehicle. There is.

  A tube joint to which the resin tube is connected when piping connection between one unit and the other unit, which are mounted on different frames and fixed to the fuel cell vehicle, with a resin tube and tube joint In some cases, excessive stress may be applied to the connection part of the tube, and there is a possibility that the tube joint formed of the resin material is damaged.

  That is, one cooling system unit mounted on a frame that is pre-assembled and fixed to the fuel cell vehicle, and the other cooling system unit mounted on another frame that is pre-assembled and fixed to the fuel cell vehicle. When connecting using a resin tube and a resin tube joint, it extends from the other cooling system unit to the resin tube joint piping connection of one cooling system unit. There is a problem that it is difficult to directly connect (insert) the opening at the connection end of the resin tube to be performed, and workability in pipe connection is deteriorated.

  Further, for example, by forcibly screwing the opening at the connection end of the resin tube into the cylindrical pipe connection, stress is applied to the stay that supports the pipe connection with respect to the frame (other frame). There is a possibility that an excessive load is applied to the stay in a concentrated manner, and the pipe connection portion including the stay is damaged.

  On the other hand, when pipe connection is made with a resin tube in the same frame, the frame (other frame) can be assembled in advance in the unit before being fixed (mounted) to the fuel cell vehicle. Therefore, problems such as the above-described deterioration in workability and damage to the pipe connection portion do not occur.

  The present invention has been made in view of the above points, and when connecting pipes between different frames assembled to a fuel cell vehicle with a resin joint member, the workability of the pipe connection is improved. An object of the present invention is to provide a fuel cell cooling system pipe connection structure that can alleviate stress concentration on the pipe connection part.

  To achieve the above object, the present invention provides a piping connection structure of a cooling system for cooling a fuel cell mounted on a fuel cell vehicle, wherein the cooling system includes a fuel cell unit frame that supports a fuel cell stack, a pump A fuel cell stack supported by the fuel cell unit frame and a cooling system unit supported by the motor unit frame are connected to the motor unit frame supporting the fuel cell and the vehicle body frame of the fuel cell vehicle. Or a pipe joint for connecting the fuel cell stack supported by the fuel cell unit frame and the cooling system unit supported by the vehicle body frame, respectively, and a joint member made of resin is disposed, The joint member is provided with a shaft seal mechanism. And wherein the Rukoto.

  According to the present invention, when the fuel cell stack and the cooling system unit supported by the motor unit frame or the vehicle body frame are connected by piping, the distance (insulation distance) from the fuel cell stack is short, so In order to ensure the properties, a resin joint member is required. In this case, since the resin joint member has a lower load bearing strength than the metal joint member, the resin joint member may not be able to withstand the load applied during pipe connection. By providing the member with the shaft seal mechanism, the load applied to the pipe connection portion at the time of pipe connection is suitably reduced.

  In addition, if the cooling system unit connected to the fuel cell stack by piping is arranged in the same frame, the positional relationship between the units is appropriately changed or adjusted when connecting the piping. It has a degree of freedom, and it is possible to avoid stress concentration on the pipe connection part. On the other hand, in the state where different frames such as a fuel cell unit frame and a motor unit frame are assembled and fixed in advance to the vehicle body of the fuel cell vehicle, piping connection between the units mounted on the different frames is performed. In this case, for example, an excessive load may be applied to the pipe connection part such as forcibly screwing and inserting a resin pipe into the pipe connection part.

  Therefore, in the present invention, when connecting pipes between units mounted on different frames that are assembled and fixed in advance to the vehicle body, the pipe connection is facilitated by providing a shaft seal mechanism on the joint member of the pipe connecting part. The stress concentration applied during pipe connection can be relaxed and the pipe connection portion can be suitably prevented from being damaged.

  In the present invention, the shaft sealing mechanism includes a small-diameter member that is detachably connected to each other, a large-diameter member into which the small-diameter member is inserted, and a seal member that seals a connection portion between the small-diameter member and the large-diameter member. It is characterized by being a connector containing these.

  According to the present invention, the shaft seal mechanism is configured by a connector that detachably connects the small-diameter member and the large-diameter member, so that the small-diameter member and the large-diameter member can be easily and quickly connected, It is excellent in insertion at the time of connection, and workability in pipe connection work can be improved.

  Furthermore, in the present invention, when the small-diameter member and the large-diameter member constituting the connector are connected in an incompletely fitted state, the marking provided on the small-diameter member side becomes visible, and the small-diameter member and the large-diameter member are visible. When the diameter member is connected in a completely fitted state, the marking is hidden by the large-diameter member so that the marking is not visible.

  According to the present invention, when the small-diameter member and the large-diameter member constituting the connector are connected, the connection between the small-diameter member and the large-diameter member is in a completely fitted state or incompletely fitted state. This can be easily confirmed by visually confirming the connection of the small diameter member and the large diameter member and checking the marking.

  Furthermore, in the present invention, the resin material forming the joint member is made of a material having electrical insulation and low ion elution, so that electrical insulation at a high voltage site near the fuel cell stack is achieved. The electrical insulation of the refrigerant itself flowing through the refrigerant system can be ensured. In addition, ion low elution means that it is hard to discharge | release ion to a refrigerant | coolant.

  In the present invention, when pipes are connected between different frames assembled to a fuel cell vehicle with a resin tube, the workability of the pipe connection can be improved and stress concentration on the pipe connection part can be reduced. A piping connection structure of the fuel cell cooling system can be obtained.

  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 cooling system according to an embodiment of the present invention is applied.

<Configuration of refrigerant circuit>
As shown in FIG. 1, the refrigerant circuit (cooling system) 10 is formed 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 fuel cell stack 12 that generates power, a radiator 14 that functions as a cooler that cools the refrigerant, a circulation passage 16 that circulates the refrigerant between the fuel cell stack 12 and the radiator 14, and a circulation passage 16. And a flow path switch for switching a flow path through which the refrigerant flows in a bypass passage 20 for bypassing the radiator 14 to the circulating path 16 or the bypass path 20. And a valve 22. 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 are disposed at both ends of the joint body 40, and a first tube 48a through which a coolant flows toward the radiator 14 is provided in the first port 46a. A second tube 48b for allowing the refrigerant to flow toward the pump 18 is detachably connected to the second port 46b on the opposite side via the second connector 50b.

  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 that intersects the 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.

  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.

<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 50 a includes a female connector portion 62 that has an insertion portion (not shown) that is fitted into the end opening of the first tube 48 a and functions as a large-diameter member, and a joint body 40. And a male connector portion 64 that functions as a small-diameter member provided on the side and connected to the female connector portion 62. A seal ring (for example, an O-ring) 66 is attached to the inner wall surface of the opening of the female connector portion 62 via an annular groove, and the seal ring 66 is connected between the male connector portion 64 and the female connector portion 62. The part is hermetically or liquid tightly sealed.

  In the present embodiment, the connector with the seal ring (O-ring) 66 attached is depicted in FIG. 2 as the shaft seal mechanism, but the present invention is not limited to this. A so-called Wilson seal type that sandwiches two elastomer sheets and seals a shaft that passes through a hole formed in the center of the elastomer sheet, or a bellows seal (not shown) that covers and covers the shaft is fitted. It goes without saying that various shaft seal structures such as the bellows seal type used can be adopted.

  In the present embodiment, the first to third connectors 50a to 50c and the three connectors (quick connectors) having the shaft seal mechanism are described. However, the present invention is not limited to this. For example, The quick connector composed of a shaft seal mechanism may be appropriately provided at a portion where the tube is directly connected to each port.

  Further, the shaft seal mechanism is not limited to the quick connector, and for example, as shown in FIG. 4, the shaft seal mechanism is provided on one flange portion 77a provided on the male connector portion 64a and on the female connector portion 62a. The other flange portion 77b may be connected to the pipe by integrally fastening with a fastening member 79 such as a bolt.

<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 structure of 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 the motor room 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 functions as a motor unit frame, and is disposed in a lower floor portion of the motor room of a fuel cell vehicle (fuel cell vehicle). The motor unit 76 includes a cooling system unit supported by the motor unit frame (first frame 78). In this case, 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 at a place where a motor 80 for driving a fuel cell vehicle is attached. Provided. 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 1, 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. By removing the under cover 84, for example, maintenance work of the fuel cell stack 12 or the ion exchanger 34 is performed. Exchange work can be performed.

  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.

  In the present embodiment, the motor unit 76 including the motor 80 and the like is configured to be supported by the first frame 78 including the motor unit frame. However, the present invention is not limited to this, and the motor 80 and the like are not limited thereto. All or part of the components of the motor unit 76 including the motor unit 76 may be supported by a vehicle body frame (not shown).

  In this case, the motor unit 76 including the motor 80 and the like is configured as a cooling system unit supported by the vehicle main body frame, and the refrigerant circuit 10 (cooling system) is a fuel cell unit frame (first assembly) that supports the fuel cell stack 12. 2 frames 86), a motor unit frame (first frame 78) that supports the motor 80 and the like, and a vehicle body frame of the fuel cell vehicle.

<Piping connection work after frame assembly>
Next, the piping connection work using the second joint member 37 will be described in detail below.
In this pipe connection work, the motor unit 76 including the motor 80 and the like supported by the first frame 78 is assembled and fixed in the motor room of the fuel cell vehicle, and the fuel cell supported by the second frame 86. This is performed after the fuel cell unit 100 including the stack 12 is assembled and fixed to the lower part of the passenger compartment.

  That is, in this embodiment, in the assembly process of the fuel cell vehicle, the motor unit 76 supported by the first frame 78 and including various tubes is assembled in the motor room of the fuel cell vehicle for each frame, and the fuel cell stack 12 The fuel cell unit 100 including the piping tubes (the sixth tube 48f and the third tube 48c) connected to the refrigerant introduction port 30a and the refrigerant outlet port 30b is assembled in the lower part of the passenger compartment of the fuel cell vehicle.

  In the present embodiment, in this manner, in a state where different units including the motor unit 76 and the fuel cell unit 100 are fixed to the fuel cell vehicle via the first frame 78 and the second frame 86, respectively, the second joint member The female connector portion 62 provided at the distal end portion of the fifth tube 48e extending from the motor unit 76 side is connected to the male connector portion 64 constituting the third connector 50c of 37.

  In this case, the third connector 50c is constituted by a shaft seal mechanism formed of a so-called quick connector, and the female connector portion 62 is easily inserted along the male connector portion 64, thereby improving workability in pipe connection. Can be made.

  Since the second joint member 37 is disposed in the fuel cell unit 100 having a short distance (insulation distance) from the fuel cell stack 12 (see FIG. 6), it is made of a resin material in order to ensure electrical insulation. Need to be formed. At that time, the second joint member 37 formed of a resin material has a lower load bearing strength than a metal joint member (not shown), and therefore may not be able to withstand the load applied at the time of pipe connection. However, in this embodiment, by providing the second connector member 37 made of resin with the third connector 50c as a shaft seal mechanism, the load applied to the joint body 54 at the time of pipe connection is suitably reduced. Is done.

  Further, if the fuel cell unit 100 including the fuel cell stack 12 and the motor unit 76 are disposed in the same frame, the positional relationship between the units is freed when connecting the piping tubes. It has a certain degree of freedom, and it is possible to avoid stress concentration on the pipe connection part. On the other hand, in a state where different frames such as the first frame 78 and the second frame 86 are assembled and fixed in advance to the vehicle body of the fuel cell vehicle, piping connection between the units mounted on the different frames is performed. When performing, for example, an excessive load may be applied to the pipe connection part such as forcibly screwing and inserting a resin pipe tube into the pipe connection part.

  For example, in the comparative example in which the shaft seal mechanism is not provided, when trying to forcibly screw in the opening of the resin piping tube and connect it to the cylindrical tube (port) of the resin joint body, There is a possibility that an excessive load is applied to the cylindrical tubular body and the cylindrical tubular body and the joint body are broken.

  In the present embodiment, when connecting each unit mounted on different frames fixed and assembled in advance to the vehicle body, a male connector is provided by providing a shaft seal mechanism on the second connector 50c of the second joint member 37. The connection between the portion 64 and the female connector portion 62 is facilitated, and the stress concentration applied at the time of connection can be relaxed, and the joint body 40 can be suitably prevented from being damaged.

  In other words, in this embodiment, when the piping tube is connected to the fixed side, the piping tube is formed by adopting a joint structure (shaft seal mechanism) that reduces the load applied to the fixed side. The workability when connecting can be improved, and the assembly time can be shortened.

  In the above description, the assembly process of the fuel cell vehicle is described as an example. This is because the first joint member 36 and the second joint member 36 in the maintenance operation of the fuel cell stack 12 and the replacement operation of the ion exchanger 34 are described. The same effect can be obtained when pipe connection of the joint member 37 is performed.

<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 part (large-diameter member) 62 and the male connector part (small-diameter member) 64 constituting each connector are mounted, the female connector part 62 and the male connector part 64 are positioned coaxially and completely Or the axial line T2 of the female connector part 62 and the axial line T1 of the male connector part 64 are inconsistent and located in a different axis and are incomplete. It is necessary to confirm whether or not it is in a fitted state (incompletely fitted 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.

  In the present embodiment, the female connector portion 62 is described as a large-diameter member and the male connector portion 64 is described as a small-diameter member. However, by contriving the shape of the connector, the female connector portion is opposite to the present embodiment. 62 may be a small-diameter member and the male connector portion 64 may be a large-diameter member. At this time, the marking 102 can be attached to the female connector portion 62.

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 disassembled perspective view which shows the modification of the shaft seal mechanism provided in the joint member. 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

DESCRIPTION OF SYMBOLS 10 Refrigerant circuit 12 Fuel cell stack 14 Radiator 36 1st joint member 37 2nd joint member 50a-50c Connector (shaft seal mechanism)
62 Female connector (large diameter member)
64 Male connector (small diameter member)
66 Seal ring (seal member)
76 Motor unit (cooling system unit)
78 First frame (motor unit frame)
80 motor 86 second frame (fuel cell unit frame)
100 Fuel cell unit 102 Marking

Claims (4)

In the piping connection structure of the cooling system for cooling the fuel cell mounted on the fuel cell vehicle,
The cooling system is disposed across a fuel cell unit frame that supports a fuel cell stack, a motor unit frame that supports a pump, and a vehicle body frame of the fuel cell vehicle,
Piping connections for connecting the fuel cell stack supported by the fuel cell unit frame and the cooling system unit supported by the motor unit frame, respectively, or the fuel cell stack supported by the fuel cell unit frame and the vehicle body A joint member made of resin is arranged in each pipe connection portion connecting the cooling system units supported by the frame,
A pipe connection structure for a fuel cell cooling system, wherein the joint member is provided with a shaft seal mechanism. In the fuel cell cooling system pipe connection structure according to claim 1,
The shaft seal mechanism is a connector including a small-diameter member that is detachably connected to each other, a large-diameter member into which the small-diameter member is inserted, and a seal member that seals a connection portion between the small-diameter member and the large-diameter member. A piping connection structure for a fuel cell cooling system. In the fuel cell cooling system pipe connection structure according to claim 2,
When the small-diameter member and the large-diameter member constituting the connector are connected in an incompletely fitted state, the marking provided on the small-diameter member side becomes visible, and the small-diameter member and the large-diameter member are completely fitted. A pipe connection structure for a fuel cell cooling system, wherein the marking is hidden by the large-diameter member so that the marking is not visible when connected in a combined state. In the fuel cell cooling system pipe connection structure according to claim 1,
A pipe connection structure of a fuel cell cooling system, wherein the resin material forming the joint member is made of a material having electrical insulation and low ion elution.

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