JP2018141539A - Fluid connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid connector which reduces a force necessary for holding a corresponding flow passage member.SOLUTION: This fluid connector 10 fluidly connects an outside fluid supply source and a pressure sensor 22. A flow passage connecting member 14 is arranged in a first passage 24 of a cylindrical main body member 12, and a valve member 16 is arranged in a second flow passage 40 of the flow passage connecting member 14. When relative pressure at an inlet opening 34 side with respect to pressure at an outlet opening 38 side of the second passage 40 reaches a constant magnitude or higher, the valve member 16 is displaced against an energization force of a coil spring 64, and takes an opening position for opening the second passage 40. The flow passage connecting member 14 receives a force to the pressure sensor 22 side by the relative pressure, and an abutment face 44 of a nozzle part 42 is pressed against a tip face 68 of the pressure sensor 22. By this constitution, the abutment face 44 and the tip face 68 are sealed and engaged with each other by a metal seal.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fluid connection device for fluidly connecting two flow path members.

  Various fluid connection devices for fluidly connecting an external fluid supply source with a flow path member have been developed. For example, in Patent Document 1, when supplying hydrogen to a fuel cell vehicle at a hydrogen gas supply station, a hydrogen supply hose on the hydrogen gas supply station side and a plug serving as a hydrogen supply port of a hydrogen tank mounted on the fuel cell vehicle A socket (female joint member) for fluidly connecting (male joint member) is shown. A hydrogen supply hose is connected to one end of the socket, and a plug is detachably held at the other end. When the socket connects and holds the plug, the socket and the plug are hermetically engaged and the flow paths are in communication with each other, and the hydrogen gas supply station and the plug are fluidly connected by the socket. As a result, the hydrogen from the hydrogen gas supply station can be filled into the hydrogen tank of the fuel cell vehicle through the socket and plug.

  The sealing engagement between the socket and the plug described above is made by a seal ring made of a rubber material. That is, a seal ring is attached to the inner peripheral surface of the plug flow path, and the socket nozzle (locking member) is inserted into the plug flow path, so that the inner peripheral surface of the plug and the outer periphery of the nozzle are inserted. The seal ring is crushed between the surfaces and brought into close contact with each surface, whereby the socket and the plug are hermetically engaged. The sealing engagement between the fluid connection device and the corresponding flow path member is often performed by a seal ring formed of an elastic member such as a rubber material.

  However, in some cases it may be desirable or impossible to use a seal ring due to a sealing engagement. The conventional fluid connection apparatus 1 shown in FIG. 7 fluidly connects an external fluid supply source (not shown) to a pressure sensor 2 as a corresponding flow path member, and supplies the test gas from the external fluid supply source to the pressure sensor 2. The pressure sensor 2 is inspected by supplying it with a predetermined pressure. In this fluid connection device 1, it is difficult to secure a place where the seal ring is disposed, and the seal ring is attached to the pressure sensor 2 by bringing the seal ring into contact with the pressure sensor 2. It may be necessary to prevent the rubber material constituting the material from adhering, and the contact surface 5 of the nozzle portion 4 of the flow path coupling member 3 of the fluid connection device 1 is directly applied to the tip surface 6 of the pressure sensor 2. A so-called metal seal is used for sealing engagement. In this fluid connection device 1, the tip surface 6 of the pressure sensor 2 is pressed by the biasing force of the coil spring 7 when the pressure sensor 2 is held by the fluid connection device 1 as shown in the figure. The metal seal is formed between the contact surface 5 of the nozzle portion 4 and the tip surface 6 of the pressure sensor 2 by the biasing force of the coil spring 7.

JP 2016-27280 A

  In order to ensure a sufficient sealing performance with a metal seal without a seal ring, it is necessary to press the contact surface against the flow path member with a relatively strong force. For this reason, in the above-described conventional fluid connection device 1, the coil spring 7 for urging the nozzle portion 4 toward the pressure sensor 2 has a relatively strong urging force. However, when the pressure sensor 2 is attached to the fluid connection device 1, the coil spring 7 having this strong biasing force must be compressed. Therefore, the pressure sensor 2 is attached with a large force proportional to the biasing force of the coil spring 7. Was necessary and this was a burden on the user.

  Therefore, the present invention is necessary for holding the corresponding flow path member in the fluid connection device that is in fluid connection with the corresponding flow path member by directly abutting the contact surface like a metal seal. It is an object of the present invention to provide a fluid connection device capable of reducing the required force.

That is, the present invention
A fluid connection device for connecting a fluid member between the external fluid supply source and the flow path member by holding a corresponding flow path member connected to the external fluid supply source,
A fluid supply port that receives a fluid from an external fluid supply source, a flow channel member holding portion that holds the corresponding flow channel member, and a first passage that extends between the fluid supply port and the flow channel member holding portion. A tubular body member;
A flow path connecting member disposed in the first passage so as to be displaceable in the direction of the longitudinal axis of the first passage, and is held by the flow path member holding portion, an inlet opening for receiving fluid from the fluid supply port An outlet opening connected to the flow path of the flow path member formed, extends from the inlet opening to the outlet opening, communicates with the first passage, and forms a flow path of the fluid connection device together with the first flow path. Two passages are formed around the outlet opening and are in contact with the flow passage member held by the flow passage member holding portion so that the second passage and the flow passage of the flow passage member communicate with each other at the outlet opening. A flow path coupling member having an abutment surface that sealingly engages the flow path member,
A side of the inlet opening with respect to pressure on the side of the outlet opening, the closed state being disposed in the second passage and having a closed state for closing or substantially closing the second passage and an open state for opening the second passage; A valve member adapted to be in the open state when the relative pressure of
A fluid connection device is provided.

  In the fluid connection device, the valve member is disposed in the second passage of the flow path coupling member, and the second pressure is obtained when the relative pressure on the inlet opening side with respect to the pressure on the outlet opening side becomes a certain level or more. The passage is opened. That is, since the second passage is closed or substantially closed until the relative pressure becomes a certain magnitude, a pressure difference is generated between the inlet opening and the outlet opening, and the flow path connecting member Is pressed toward the outlet opening by the fluid pressure. As a result, the contact surface formed around the outlet opening is pressed against the flow path member held by the flow path member holding portion so that the second flow path communicates with the flow path of the flow path member. The sealing member is in sealing engagement with the flow path member. As described above, in the fluid connection device, the contact surface of the flow channel coupling member is pressed against the fluid member using the fluid pressure supplied from the external fluid supply source. Thus, there is no need to use a coil spring having a strong biasing force to press the flow path connecting member toward the flow path member. Therefore, it is possible to reduce the force required when holding the flow path member in the flow path member holding portion.

  Preferably, when the valve member is in the closed state, the valve member can have a micro flow path communicating between the inlet opening and the outlet opening.

  Specifically, the minute channel may be constituted by a gap formed between the outer peripheral surface of the valve member and the inner peripheral surface of the second passage.

  By having such a micro flow path, even when the relative pressure on the inlet opening side with respect to the pressure on the outlet opening side falls below a certain level and the valve member returns to the closed state, the micro flow path Then, the fluid gradually flows from the inlet opening to the outlet opening. As a result, the relative pressure can be reduced so that the pressure on the outlet opening side becomes equal to the pressure on the inlet opening side. For example, when the corresponding flow path member is a pressure sensor and a predetermined pressure is applied to the pressure sensor to check whether the pressure sensor operates as specified, the fluid supplied from the external fluid supply source If there is a difference between the pressure and the pressure applied to the pressure sensor, correct inspection cannot be performed. However, by having the micro flow path as described above, the fluid supply pressure from the partial fluid supply source and the pressure sensor It is possible to make the applied pressure equal, and an appropriate inspection can be performed.

Preferably,
The flow path connecting member between the closed position where the valve member is in the closed state and the open position where the valve member is located closer to the outlet opening in the direction of the longitudinal axis than the closed position and is in the open state Can be displaced with respect to
A biasing member that biases the valve member toward the closed position can be further provided.

  With such a configuration, the magnitude of the pressure when the valve member changes from the closed state to the open state can be adjusted by changing the urging force of the urging member.

Preferably,
The second passage has a small-diameter passage portion on the inlet opening side and a large-diameter passage portion on the outlet opening side connected to the small-diameter passage portion and having an inner diameter larger than the small-diameter passage portion;
The valve member has a valve main body portion inserted into the small diameter passage portion, and a flange portion positioned in the large diameter passage portion and extending radially outward from the valve main body portion,
A notch is provided at an end of the valve main body on the inlet opening side, and when the valve member is in the open position, the small-diameter passage portion and the large-diameter passage portion are interposed through the notch. Can be communicated.

Preferably,
The biasing member has a first end supported by the flange portion and a second end supported by the flow path coupling member, and the opening from the first end to the opening of the second end A coil spring defining an internal space extending in the direction of the longitudinal axis;
The flange portion may partially support the first end of the coil spring so that the internal space and the second passage communicate with each other through the opening of the first end.

  When the coil spring is greatly compressed, the wires constituting the coil spring come into contact with each other and the fluid cannot pass therethrough, which may prevent the flow of fluid. However, with the above-described configuration, the fluid can flow from the opening of the coil spring through the inner space toward the outlet opening, so that the coil spring is greatly compressed. Even in this case, it is possible to prevent the flow of fluid from being blocked.

  Further, the flow path connecting member may further include a coil spring that urges the contact surface in a direction in which the contact surface is pressed against the flow path member.

  Since the force by which the contact surface is pressed against the flow path member is assisted by such a coil spring, the sealing engagement between the contact surface and the flow path member can be made more reliable. It becomes. In addition, since this coil spring can be made into a thing with small biasing force compared with the conventional similar coil spring, it is required when hold | maintaining the flow-path member when using this coil spring in a flow-path member holding part. The force is smaller than that required in conventional fluid connection devices.

  Hereinafter, an embodiment of a fluid connection device according to the present invention will be described with reference to the accompanying drawings.

It is sectional drawing of the fluid connection apparatus which concerns on one Embodiment of this invention, and is a figure which shows the state before a pressure sensor is connected. The valve member is shown as a cross-sectional view taken along the line aa in FIG. It is a figure which shows the state by which the pressure sensor was hold | maintained at the pressure sensor holding | maintenance part in the fluid connection apparatus of FIG. It is a figure which shows the state which the valve member of the fluid connection apparatus of FIG. 2 displaced to the open position. It is a perspective view of the valve member with which the fluid connection apparatus of FIG. 1 is provided. It is a front view of the valve member of FIG. FIG. 2 is an enlarged view around a valve member of the fluid connection device of FIG. 1. It is a figure which shows the conventional fluid connection apparatus.

  As shown in FIG. 1, a fluid connection device 10 according to an embodiment of the present invention includes a cylindrical main body member 12, a flow path connecting member 14 disposed in the main body member 12, and a flow path connecting member 14. An external fluid supply source (not shown) connected to the fluid supply port 18 of the main body member 12, and a pressure sensor holding portion (flow channel member holding portion) 20 of the main body member 12. And a pressure sensor (flow path member) 22 held in the fluid.

  The body member 12 is connected to an external fluid supply source and receives a fluid supply port 18 that receives fluid supplied from the external fluid supply source, a pressure sensor holding portion 20 that holds the pressure sensor 22, and a first extending between them. And a passage 24. The pressure sensor holding part 20 is provided with a spherical locking element 26 held so as to be displaceable in the radial direction, a collar 28 for supporting the locking element 26 from the inside, and a sleeve 30 for holding the locking element 26 from the outside. ing. When the pressure sensor 22 is inserted into the collar 28, and the holding plug 32 is put on the outside of the pressure sensor 22, and the holding plug 32 is pushed into the main body member 12, the holding plug 32 is locked as shown in FIG. Locked by the child 26, the pressure sensor 22 is held by the pressure sensor holding unit 20 via the holding plug 32. When releasing the holding of the pressure sensor 22 in the pressure sensor holding unit 20, the sleeve 30 is pulled (to the left as viewed in the figure). If it does so, the latching with respect to the holding | maintenance plug 32 by the locking element 26 will be cancelled | released, and the pressure sensor 22 will be in the state which can be removed from the pressure sensor holding | maintenance part 20 with the holding | maintenance plug 32.

  The flow path connecting member 14 is disposed in the first passage 24 of the main body member 12 so as to be displaceable in the direction of the longitudinal axis L of the first passage 24. The flow path connecting member 14 includes an inlet opening 34 that receives fluid from the fluid supply port 18 of the main body member 12, and an outlet opening 38 that is connected to the flow path 36 of the pressure sensor 22 held by the pressure sensor holding unit 20. And a second passage 40 extending between them. The flow path connecting member 14 further has a nozzle portion 42, and the outlet opening 38 is formed in the nozzle portion 42. A contact surface 44 having a tapered shape is formed around the outlet opening 38 at the tip of the nozzle portion 42. A seal ring 46 is attached to the outer peripheral surface 14 a of the flow path connecting member 14 so that the inner peripheral surface 12 a of the main body member 12 and the outer peripheral surface 14 a of the flow path connecting member 14 are hermetically engaged. . As a result, the second passage 40 of the flow passage connecting member 14 communicates with the first passage 24 of the main body member 12 and constitutes the flow passage 48 of the fluid connection device 10 together with the first passage 24. The second passage 40 has a small-diameter passage portion 40a extending from the inlet opening 34, a large-diameter passage portion 40b connected to the small-diameter passage portion 40a having an inner diameter larger than that of the small-diameter passage portion 40a, and an outlet from the large-diameter passage portion 40b through the nozzle portion 42. The nozzle channel portion 40c reaches the opening 38.

  A coil spring 50 is disposed between the flow path coupling member 14 and the main body member 12, and the flow path coupling member 14 is urged toward the pressure sensor holding portion 20 side of the main body member 12 by the coil spring 50. Yes. In a state where the pressure sensor 22 is not attached to the pressure sensor holding part 20, the nozzle part 42 of the flow path connecting member 14 is inserted into and supported by the nozzle support part 52 of the main body member 12, as shown in FIG. It becomes a state. The nozzle part 42 is supported by the nozzle support part 52, thereby positioning in the radial direction.

  The valve member 16 is disposed so as to be displaceable in the direction of the longitudinal axis L in the second passage 40 of the flow path connecting member 14. As can be seen from FIGS. 4 and 5, the valve member 16 includes a generally cylindrical valve main body 54 and a flange 56 extending radially outward from the valve main body 54. A notch 60 is formed at one end 58 of the valve body 54. A notch 62 is also formed in the other end portion 59, and the flange portion 56 is shaped to extend radially outward from only a part of the outer periphery of the valve main body portion 54. The valve member 16 is urged by a coil spring 64 and is held at the closed position shown in FIGS. 1 and 2 in a state where no fluid is supplied from an external fluid supply source. When in the closed position, the flange portion 56 contacts the inner peripheral surface 14b of the flow path connecting member 14 in the direction of the longitudinal axis, and a part of the valve main body portion 54 is inserted into the small diameter passage portion 40a of the second passage 40. It has become a state. As shown in FIG. 6, the outer diameter of the portion of the outer peripheral surface 16 a of the valve main body portion 54 without the notch 60 is slightly smaller than the inner diameter of the small-diameter passage portion 40 a of the second passage 40, and the valve member 16. A small gap is formed between the outer peripheral surface 16a of the first flow passage and the inner peripheral surface 14b of the small-diameter passage portion 40a of the flow path connecting member 14. Due to this gap, a minute flow channel 66 is formed which communicates between the inlet opening 34 and the outlet opening 38 even when the valve member 16 is in the closed position. Therefore, even when the valve member 16 is in the closed position, the second passage 40 is not completely closed, and is in a state of being opened very slightly through the minute flow path 66. The incomplete closing in which the second passage 40 is opened only slightly through the minute flow path 66 in this manner is referred to as substantially closing here. In the fluid connection device 10, the second passage 40 is substantially closed by the valve member 16 when the valve member 16 is in the closed position.

  When the pressure sensor 22 is inserted into the pressure sensor holding portion 20 of the main body member 12 together with the holding plug 32 from the state of FIG. 1, the tip surface 68 of the pressure sensor 22 contacts the nozzle portion 42 of the flow path connecting member 14. Abutting on the surface 44, the flow path connecting member 14 is pushed against the urging force of the coil spring 50. Then, the holding plug 32 is locked by the lock 26 as described above, and the pressure sensor 22 is held by the pressure sensor holding portion 20 as shown in FIG. At this time, the abutting surface 44 of the flow path connecting member 14 is pressed against the distal end surface 68 of the pressure sensor 22 by the urging force of the coil spring 50, and the urging force of the coil pull ring 50 causes the abutting surface 44 to move toward the distal end surface 68. Therefore, the flow path 48 of the fluid connection device 10 and the flow path 36 of the pressure sensor 22 are not yet in a sufficiently sealed state and in communication with each other.

  When the fluid is supplied from the external fluid supply source in the state of FIG. 2, the fluid is prevented from flowing to the outlet opening 38 because the second passage 40 is in a closed state in which the valve member 16 is substantially closed. The pressure on the inlet opening 34 side relative to the member 16 is higher than the pressure on the outlet opening 38 side. Then, the flow path connecting member 14 is pushed to the outlet opening 38 side, that is, the pressure sensor 22 side. Thereby, the contact surface 44 of the flow path connecting member 14 is pressed against the distal end surface 68 of the pressure sensor 22 by the fluid pressure. As the relative pressure on the inlet opening 34 side with respect to the pressure on the outlet opening 38 side increases, the force with which the contact surface 44 is pressed increases, and the contact surface 44 and the front end surface 68 of the pressure sensor 22 are sufficiently sealed. The metal seal is formed by being engaged. When the relative pressure is further increased and exceeds a certain level, and the force received by the valve member 16 from the fluid exceeds the biasing force of the coil spring 64, the valve member 16 compresses the coil spring 64 toward the outlet opening 38. It is displaced toward the open position of FIG. In this open position, the small-diameter passage portion 40a and the large-diameter passage portion 40b of the second passage 40 communicate with each other through the notch 60 of the valve member 16, and the second passage 40 is opened. The fluid flows through the notch 60 toward the outlet opening 38, and further reaches the flow path 36 of the pressure sensor 22 from the outlet opening 38.

  The coil spring 64 that biases the valve member 16 has a first end 70 supported by the valve member 16 and a second end 72 supported by the flow path connecting member 14, and the fluid that has passed through the valve member 16 is It reaches the outlet opening 38 through an internal space 76 that extends between the opening 74 at the first end 70 and the opening 75 at the second end 72. When the coil spring 64 is greatly compressed, the wires constituting the coil spring 64 may come into contact with each other in the direction of the longitudinal axis L, and the fluid may not pass between the wires. That is, when the valve member 16 is in the open position, the fluid may not flow from the outside of the coil spring 64 to the internal space 76 through the wires. As described above, the valve member 16 of the fluid connection device 10 has a shape in which the flange portion 56 extends radially outward from only a part of the valve main body portion 54 in the circumferential direction. The flange portion 56 only partially supports the first end 70 of the coil spring 64, and the opening portion 74 of the first end 70 of the coil spring 64 is not completely blocked by the valve member 16, and a part thereof. It will be in the state opened through the notch 62 with respect to the 2nd channel | path 40. FIG. That is, the internal space 76 of the coil spring 64 is in a state of communicating with the second passage 40 at the opening 74 of the first end 70. With such a configuration, even when the wire members come into contact with each other when the valve member 16 is in the open position and the gap between them is blocked, the fluid flows from the opening 74 of the first end 70 to the coil spring 64. It can flow through the interior space 76 to the outlet opening 38.

  When the valve member 16 is displaced to the open position, fluid flows toward the outlet opening 38 and the pressure on the outlet opening 38 side rapidly increases. Accordingly, the relative pressure on the inlet opening 34 side with respect to the pressure on the outlet opening 38 side becomes smaller. When the relative pressure becomes less than a certain level, the valve member 16 is returned to the closed position in FIG. 2 again by the biasing force of the coil spring 64. Immediately after the valve member 16 returns to the closed position, the pressure on the inlet opening 34 side is still higher. In this state, the fluid on the inlet opening 34 side exits through a micro flow channel 66 (FIG. 6) formed between the outer peripheral surface 16 a of the valve member 16 and the inner peripheral surface 14 b of the flow channel connecting member 14. It reaches the side of the opening 38. As a result, the pressure difference gradually decreases, and the pressure on the outlet opening 38 side eventually becomes equal to the pressure on the inlet opening 34 side. As a result, the pressure sensor 22 is in a state where a pressure of the same magnitude as that of the external fluid supply source is applied. The output value of the pressure sensor 22 is thus measured in a state where a predetermined pressure is applied from the external fluid supply source, and it is inspected whether the pressure sensor 22 has performance as specified.

  As described above, in the fluid connection device 10, when the supply of the fluid from the external fluid supply source is started, the relative pressure on the inlet opening 34 side temporarily increases, and the contact surface of the flow path connecting member 14. 44 is pressed strongly against the front end surface 68 of the pressure sensor 22 so that the contact surface 44 and the front end surface 68 are sufficiently sealed and engaged to form a metal seal. That is, in the fluid connection device 10, the metal seal is formed mainly by the fluid pressure. Therefore, unlike the conventional fluid connection device, the coil spring for biasing the flow path connecting member is formed to form the metal seal. It is not necessary to have such a large urging force as is required for Thereby, when attaching the pressure sensor 22 to the pressure sensor holding | maintenance part 20, since it becomes unnecessary to compress the coil spring which has such a big urging | biasing force, it becomes possible to make small force required for attachment work.

  Although one embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible. For example, in the above embodiment, the device for holding the pressure sensor 22 is used, but it is used for fluid connection with other forms of flow path members, such as a pipe joint for connecting pipes. Also good. Further, the valve member 16 is displaced between the closed position and the open position in the direction of the longitudinal axis L, so that the second passage 40 is substantially closed and opened. It has other valve structures such as pivoting to change from a closed state to an open state, or elastically deforming by fluid pressure to open a flow path. It can also be. The minute channel can be a minute hole penetrating the valve body 54, or the channel connecting member 14 has a minute channel different from the second channel 40, which is used as the minute channel. You may do it. If the pressure on the inlet opening 34 side and the pressure on the outlet opening 38 side do not have to be made equal to each other, the second passage 40 is closed when the valve member 16 is closed without the minute flow path. The valve member 16 may be completely closed. In addition, the flow path connecting member 14 and the pressure sensor 22 in the above embodiment are formed of a metal material, and therefore, the direct contact between the contact surface 44 of the flow path connecting member 14 and the front end surface 68 of the pressure sensor 22. However, this is not intended to limit the sealing engagement according to the present invention to the abutting of metals. One or both may be made of a material other than a metal such as a resin material.

Fluid connection device 10; body member 12; inner peripheral surface 12a; flow path coupling member 14; outer peripheral surface 14a; inner peripheral surface 14b; valve member 16; outer peripheral surface 16a; Holding part) 20; pressure sensor (flow path member) 22; first passage 24; lock 26; collar 28; sleeve 30; holding plug 32; inlet opening 34; flow path 36; outlet opening 38; Large-diameter passage portion 40a; Large-diameter passage portion 40b; Nozzle passage portion 40c; Nozzle portion 42; Contact surface 44; Seal ring 46; Channel 48; Coil spring 50; Nozzle support portion 52; 56; one end 58; the other end 59; notch 60; notch 62; coil spring 64; microchannel 66; tip surface 68; first end 70; second end 72; Internal space 76;
Longitudinal axis L;

Claims (7)

A fluid connection device for connecting a fluid member between the external fluid supply source and the flow path member by holding a corresponding flow path member connected to the external fluid supply source,
A fluid supply port that receives a fluid from an external fluid supply source, a flow channel member holding portion that holds the corresponding flow channel member, and a first passage that extends between the fluid supply port and the flow channel member holding portion. A tubular body member;
A flow path connecting member disposed in the first passage so as to be displaceable in the direction of the longitudinal axis of the first passage, and is held by the flow path member holding portion, an inlet opening for receiving fluid from the fluid supply port An outlet opening connected to the flow path of the flow path member formed, extends from the inlet opening to the outlet opening, communicates with the first passage, and forms a flow path of the fluid connection device together with the first flow path. Two passages are formed around the outlet opening and are in contact with the flow passage member held by the flow passage member holding portion so that the second passage and the flow passage of the flow passage member communicate with each other at the outlet opening. A flow path coupling member having an abutment surface that sealingly engages the flow path member,
A side of the inlet opening with respect to pressure on the side of the outlet opening, the closed state being disposed in the second passage and having a closed state for closing or substantially closing the second passage and an open state for opening the second passage; A valve member adapted to be in the open state when the relative pressure of
A fluid connection device comprising:   2. The fluid connection device according to claim 1, wherein the fluid connection device has a minute flow path communicating between the inlet opening and the outlet opening when the valve member is in the closed state.   The fluid connection device according to claim 2, wherein the minute flow path is configured by a gap formed between an outer peripheral surface of the valve member and an inner peripheral surface of the second passage. The flow path connecting member between the closed position where the valve member is in the closed state and the open position where the valve member is located closer to the outlet opening in the direction of the longitudinal axis than the closed position and is in the open state Can be displaced with respect to
4. The fluid connection device according to claim 1, further comprising a biasing member that biases the valve member toward the closed position. 5. The second passage has a small-diameter passage portion on the inlet opening side and a large-diameter passage portion on the outlet opening side connected to the small-diameter passage portion and having an inner diameter larger than the small-diameter passage portion;
The valve member has a valve main body portion inserted into the small diameter passage portion, and a flange portion positioned in the large diameter passage portion and extending radially outward from the valve main body portion,
A notch is provided at an end of the valve main body on the inlet opening side, and when the valve member is in the open position, the small-diameter passage portion and the large-diameter passage portion are interposed through the notch. The flow path connecting device according to claim 4, wherein the communication is established. The biasing member has a first end supported by the flange portion and a second end supported by the flow path coupling member, and the opening from the first end to the opening of the second end A coil spring defining an internal space extending in the direction of the longitudinal axis;
6. The flange portion partially supports the first end of the coil spring, and the internal space and the second passage communicate with each other through an opening at the first end. The fluid connection device according to 1.   The fluid connection device according to any one of claims 1 to 6, further comprising a coil spring that urges the flow path connecting member in a direction in which a corresponding contact surface is pressed against the flow path member.

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