JP2011174606A - One-way valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an one-way valve 20 in which a flow channel resistance is reduced in opening the valve, by realizing, with a simple structure, a means for preventing a closing section 31 of a valve plate 30 for opening and closing an outflow opening 21b from excessively opened. <P>SOLUTION: The one-way valve 20 includes a channel forming member 21 and the valve plate 30 formed by cutting and bending an elastic thin plate. The channel forming member 21 includes a mounting section 24 for mounting the valve plate 30. The valve plate 30 comprises the closing section 31, a section 34 to be mounted thereon, and an elastically deforming section 36. An opening degree regulating section 28 of the section 24 to be mounted thereon includes a regulating face 28a. When the closing section 31 is pushed by the fluid flowing through a flow channel 21a, the regulating section 28a forms an elastically deforming space while substantially preserving an angled state, with a coupled position between the elastically deforming section 36 and the section 34 to be mounted thereon as a supporting point. Then, the elastically deforming section 36 abuts against the closing section 31 to thereby regulate an angle made when the closing section 31 opens in relation to the outflow opening 21b. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a check valve attached to a fuel supply pipe for introducing fuel into a fuel tank of a vehicle.

  2. Description of the Related Art Conventionally, a fuel tank of an automobile includes a check valve for preventing fuel from returning to the outside due to an increased tank internal pressure when refueling is stopped (for example, a patent) Reference 1). That is, the check valve includes a passage forming member provided with an outflow port through which fuel flows out from the passage, and a valve plate attached to the passage forming member to open and close the outflow port. The valve plate is formed by bending the attached portion at one end of the closing portion, and attaching the attached portion to the attaching portion formed on the outer peripheral portion of the passage forming member, thereby opening and closing the outlet at the closing portion. Yes.

  In the above check valve, if the closing portion of the valve plate receives excessive fuel flow in the passage and opens too much, the bent portion of the closing portion and the attached portion is plastically deformed, and the closing body completely closes the outlet. There is no possibility. As a means for preventing the closing body from opening too much, an opening degree restricting portion is provided in a part of the valve plate. However, the opening degree control part has a problem that the shape is complicated and the molding is troublesome. In addition, since the valve plate is elastically deformed and greatly opened, there is a problem that the flow path resistance increases and it is difficult to supply fuel smoothly.

JP2009-202836

  The present invention solves the above-mentioned problems of the prior art, and realizes a means for preventing the closing portion of the valve plate that opens and closes the outlet from opening too much with a simple configuration, and the flow path at the time of opening the valve. An object is to provide a check valve with reduced resistance.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
Application Example 1 includes a passage forming member having a passage and an outflow port for flowing out the fluid flowing through the passage, and a valve plate formed by cutting and bending an elastic thin plate and opening and closing the outflow port. In the check valve
The passage forming member includes an attachment portion that is formed on an outer peripheral portion of the passage forming member for attaching the valve plate,
The valve plate connects a closing portion that opens and closes the outlet, a mounted portion for mounting the valve plate to the mounting portion, one end portion of the outer periphery of the closing portion, and the mounted portion. An elastic deformation part bent at a predetermined angle with respect to the closing part,
The attachment portion has an opening degree restriction portion formed on the opening end side of the outlet, and the opening degree restriction portion is elastically deformed when the closing portion is pushed by the fluid flowing through the passage. A space for elastic deformation so that the closing portion opens while substantially maintaining the bent state at the predetermined angle with the connection portion between the mounting portion and the mounted portion as a fulcrum, and the elastic deformation portion hits the above Having a regulating surface that regulates an angle at which the closing portion opens with respect to the outlet,
It is characterized by.

  When the check valve described in Application Example 1 is used in a fuel tank, the outlet of the passage forming member is opened and closed by a valve plate. The valve plate uses a thin plate having elasticity, and integrally forms a closing portion and an elastic deformation portion and a mounting portion bent at a predetermined angle from a part of the outer periphery of the closing portion, and the passage forming member is formed by the mounting portion. It is attached to the mounting part. The elastically deforming portion acts as a spring that applies an urging force in the direction in which the closing portion is seated on the seat portion, and when a fluid force is applied to the closing portion, the elastic deformation portion is bent at a predetermined angle with the connection portion with the attached portion as a fulcrum While maintaining this state, it is elastically deformed so that the closing part opens in the space formed by the opening degree restricting part. Then, the fuel flows out to the fuel tank by the opening operation of the closing portion. At this time, when the opening angle of the closing portion reaches a predetermined angle, the opening operation of the closing portion is restricted by the opening degree restricting portion formed in the attachment portion. That is, the opening angle of the closing part is restricted by the elastic deformation part hitting the restriction surface of the opening degree restricting part. Therefore, it does not undergo plastic deformation at the elastically deforming portion or the connecting portion between the elastically deforming portion and the attached portion, has excellent durability, and can perform the closing operation of the closing portion reliably. Moreover, since the opening degree restriction part is formed integrally with the attachment part, the number of parts does not increase and the configuration is simple.

[Application Example 2]
The elastic deformation part of the application example 2 can take the structure provided with the arm arrange | positioned in parallel. With this configuration, even if a twisting force is applied to the closing portion, a reaction force is generated in a direction to eliminate the twisting, and thus the closing portion is quickly returned to the original position. Therefore, fluttering of the closing portion can be suppressed.

[Application Example 3]
In Application Example 3, the elastic deformation portion has a curved portion that is curved to bend at an angle between the closing portion and the attached portion, and is provided between the outer peripheral surface of the passage forming member and the curved portion. The structure which has the step part which forms a gap | interval can be taken. In this configuration, when the angle between the attached portion and the closing portion does not become a predetermined angle, the bending portion can be further elastically deformed to finely adjust the angle so that the closing portion can be brought into close contact with the seat surface. . That is, the bending portion does not receive a bending force that directly contacts the outer peripheral surface of the passage forming member and deviates from a predetermined angle by the gap, and can be finely adjusted by itself.

[Application Example 4]
The restricting surface of Application Example 4 can be configured to be a curved surface that follows the elastic deformation of the elastic deformation portion. With this configuration, when the check valve is opened, the elastically deforming portion of the valve plate bends uniformly along the regulating surface, so that no excessive stress is applied to the connecting portion with the mounted portion. It does not cause plastic deformation.

[Application Example 5]
Application Example 5 has a configuration in which the outlet side of the passage forming member includes an inclined portion inclined with respect to the axis of the passage forming member, and the outlet is formed in an oval shape. Further, the outlet side of the passage forming member may be formed at right angles to the axis of the passage forming member as long as it does not hinder the opening and closing of the valve plate.

[Other application examples]
A passage forming member according to another application example includes a locking portion formed at an opening peripheral edge portion of the outlet, and the valve plate protrudes from an outer peripheral portion of the closing portion and hits the locking portion. And the said closing part is the structure provided with the to-be-latched part which regulates the movement along the said inclination part. With this configuration, even if the closing portion receives a force in a direction that causes a displacement due to the flow in the direction toward the check valve from the inside of the fuel tank, the locked portion hits the locking portion and the displacement is regulated. Is done. Therefore, it is possible to prevent the sealing performance from being lowered due to the positional deviation of the closing portion. As such an application example, the locking portion is a pressure receiving surface that protrudes at a predetermined angle with respect to the inclined portion, and the locked portion is between the outer peripheral portion of the closing portion and the elastic deformation portion. It is possible to provide a pressing surface which is formed by bending with respect to the elastic deformation portion and hits the locking portion. Moreover, the latching | locking part concerning another application example is an outer peripheral part of the said channel | path formation member, and is provided in the outer peripheral end on the opposite side to the said attachment part, The said to-be-latched part is the outer periphery of the said closing part. It is the structure which was formed by bending from the part and made into the protrusion piece which hits the said latching | locking part.

It is the schematic which shows the fuel supply apparatus for supplying a fuel to the fuel tank of a motor vehicle. It is sectional drawing to which the fuel tank pipe connection body and check valve of the fuel tank were expanded. It is the perspective view which decomposed | disassembled the pipe connection body and check valve for fuel tanks. It is sectional drawing to which the check valve of FIG. 2 was expanded. It is explanatory drawing which shows the valve opening state of a non-return valve. It is explanatory drawing explaining the state before attaching a valve plate to the attaching part of a channel | path formation member. It is explanatory drawing explaining the state which assembled | attached the valve plate to the attachment part of the channel | path formation member. It is sectional drawing which shows the non-return valve concerning another Example. It is the perspective view which decomposed | disassembled the non-return valve concerning another Example. It is sectional drawing which shows a non-return valve. It is sectional drawing which shows the non-return valve concerning another Example. It is sectional drawing which shows the non-return valve concerning another Example.

(1) Schematic Configuration of Refueling Device FS FIG. 1 is a schematic view showing a fueling device FS for supplying fuel to a fuel tank FT of an automobile. As shown in FIG. 1, the fueling device FS is connected to a fuel tank FT and sends fuel supplied from a fueling gun (not shown) to the fuel tank FT, and has an inlet that is opened and closed by a fuel cap FC. A filler neck FN, a metal or resin inlet pipe IP connected to one end of the filler neck FN, a rubber inlet hose H connected to the inlet pipe IP, and a fuel connected to one end of the inlet hose H A fuel tank pipe connector 10 welded to the tank FT and a check valve 20 assembled integrally with the fuel tank pipe connector 10 are provided. The inlet hose H is press-fitted into the fuel tank pipe connector 10 and fastened by a clamp CP. With the configuration of the fueling device FS, when the fuel cap FC is removed during fueling and fuel is injected from the fueling gun into the filler neck FN, the fuel flows through the inlet pipe IP, the inlet hose H, and the fuel tank connector 10. Further, the check valve 20 is opened and supplied to the fuel tank FT. On the other hand, when the refueling is stopped, the check valve 20 is in a closed state, and therefore prevents the fuel from being pushed back by the increased tank internal pressure and flowing out to the outside.

(2) Configuration and operation of each unit The configuration of each unit will be described below.
(2) -1 Fuel tank FT
The fuel tank FT is formed of a plurality of resin layers including a barrier layer formed of an ethylene vinyl alcohol copolymer (EVOH) excellent in fuel permeation resistance and an outer layer formed of polyethylene (PE). . A tank opening FTa is formed in the upper part of the side wall of the fuel tank FT, and a fuel tank pipe connector 10 is welded so as to surround the tank opening FTa.

(2) -2 Pipe connection body 10 for fuel tank
2 is an enlarged cross-sectional view of the fuel tank pipe connector 10 and the check valve 20 of the fuel tank FT, and FIG. 3 is an exploded perspective view of the fuel tank pipe connector 10 and the check valve 20. In FIG. 2, the fuel tank pipe connector 10 includes a passage forming portion 12, a connecting weld portion 14 formed in two colors on the passage forming portion 12, and a metal reinforcing pipe 16. The passage forming portion 12 includes a passage portion 12 a that forms a passage connected to the inlet hose H. One end of the passage portion 12a is expanded from the outer peripheral end of the passage portion 12a, thereby forming a retaining extension portion 12b for retaining the inlet hose H (FIG. 1). A flange 12c is formed at the other end of the passage portion 12a. One surface of the flange 12c is a surface that is welded to the inner wall of the welding portion 14 for connection. The passage forming part 12 is made of, for example, polyamide (PA) such as nylon-12. The welding part 14 for connection is provided with the outer cylinder part 14a, the flange 14b extended from the outer periphery of the end of the outer cylinder part 14a, and the welding end 14c projected in the annular | circular shape at the one end surface of the flange 14b. The welding part 14 for connection is formed from the modified polyethylene which can be heat-welded to the fuel tank FT. The modified polyethylene is a resin material in which a polar functional group, for example, a functional group modified with maleic acid is added to polyethylene (PE), and is a material that is reactively bonded to PA by heat during injection molding. Therefore, the welding part 14 for connection is integrated with the passage forming part 12 by reactive adhesion by two-color molding. The reinforcing tube 16 is a metal tube, and includes a tube body 16a, a retaining portion 16b formed on one end of the tube body 16a, and three retaining pieces obtained by bending a part of the other end. 16c, and is attached to the inner wall of the passage forming portion 12 to reinforce the passage forming portion 12. As shown in FIG. 3, the retaining piece 16c is formed straight from the end of the pipe body 16a and caulked to the end of the passage forming portion 12 as shown in FIG. Can be installed.

(2) -3 Configuration of Check Valve 20 The check valve 20 is formed integrally with the passage forming portion 12 and includes a passage forming member 21 having a passage 21a. The check valve 20 is attached to one end of the passage forming member 21 and has an outlet 21b. And a valve plate 30 that opens and closes. The passage forming member 21 is a tube formed from the same PA as the passage forming portion 12, and the inlet hose H side is an inflow port 21c.

  4 and 5 are enlarged cross-sectional views of the check valve 20 of FIG. 2, FIG. 4 shows a closed state of the check valve 20, and FIG. 5 shows a opened state of the check valve 20. In FIG. 4, the outlet 21 b side of the passage forming member 21 is an inclined portion 23 that is inclined with respect to the center line CL (axis) of the passage forming member 21. The inclined portion 23 is inclined at an angle θ with respect to the center line CL. A seat surface 23a to which the valve plate 30 is attached and detached is formed in an oval shape along the opening peripheral edge portion of the outlet 21b of the inclined portion 23. A mounting portion 24 for mounting the valve plate 30 is formed on the outer peripheral portion of the upper portion of the outlet 21b of the passage forming member 21. The configuration of the attachment portion 24 will be described later.

  In FIG. 3, the valve plate 30 is formed by integrally forming a closing portion 31, a mounted portion 34, and an elastic deformation portion 36 as a leaf spring by pressing and bending a thin metal plate. The closing portion 31 has substantially the same shape as the outer shape of the seat surface 23a and opens and closes the outlet 21b of the passage forming member 21, that is, is formed so as to be attached to and detached from the seat surface 23a. The attached portion 34 is a portion that supports the closing portion 31 so that it can be opened and closed by being attached to the attaching portion 24 of the passage forming member 21, and includes a retaining piece 34 a. The retaining piece 34a is formed by cutting and raising a part of the attached portion 34 by press molding or the like. The elastic deformation portion 36 is a portion that connects one end portion of the outer periphery of the closing portion 31 and the attached portion 34, and is bent so that an angle with respect to the closing portion 31 is α. The elastic deformation portion 36 includes an arm 36a arranged in parallel, and the arm 36a connects one end of the outer periphery of the closing portion 31 and the attached portion 34. The end portion of the arm 36a and the outer peripheral end of the closing portion 31 are slightly curved portions 36b.

  FIG. 6 is an explanatory diagram for explaining a state before the valve plate 30 is assembled to the mounting portion 24 of the passage forming member 21, and FIG. 7 is an explanatory diagram for explaining a state where the valve plate 30 is assembled to the mounting portion 24 of the passage forming member 21. These are shown partially broken. The attachment part 24 includes a side wall part 25, a bridge part 26, an attachment groove 27, and an opening degree restriction part 28. The side wall portion 25 is provided with restriction walls 25a on both sides that are erected substantially in parallel from the outer periphery of the passage forming member 21, and a back wall 25b that connects the restriction walls 25a. The part 34 is positioned. The bridge portion 26 is stretched over the regulation wall 25 a of the side wall portion 25. The mounting groove 27 is a groove for positioning and guiding the mounted portion 34 and the elastic deformation portion 36, and includes a step portion 27a, an insertion hole 27b, and an engaging portion 27c. The step portion 27a is disposed with a gap from the bending portion 36b of the elastic deformation portion 36, and allows the bending portion 36b to be deformed. The insertion hole 27b is formed between the bridge portion 26 and the outer peripheral surface of the passage forming member 21, so that the attached portion 34 can be inserted. The engaging portion 27c is formed in a recess from the bottom of the insertion hole 27b, and the attached portion 34 is prevented from being pulled out by engaging with the retaining piece 34a.

  5 and 6, the opening degree restricting portion 28 is formed integrally with the bridge portion 26 on the opening end side of the outflow port 21b, and has a predetermined angle β (180 ° −α) with respect to the center line CL. ) Has a regulating surface 28a that is inclined by an angle. When the closing portion 31 is pushed by the fluid flowing through the passage 21a, the restricting surface 28a substantially maintains a state where it is bent by a predetermined angle α with the connecting portion between the elastically deforming portion 36 and the attached portion 34 as a fulcrum. A space that is elastically deformed so as to open the closing portion 31 is formed, and the closing portion 31 is restricted to an angle β that is opened with respect to the outflow port 21b by contact with the elastic deformation portion 36.

  As shown in FIGS. 6 and 7, in order to attach the attached portion 34 of the valve plate 30 to the attaching portion 24 of the passage forming member 21, the attached portion 34 is inserted into the insertion hole 27 b of the attachment groove 27. At this time, the to-be-attached part 34 is inserted into the back side of the attachment groove 27 while the retaining piece 34 a is compressed between the bridge part 26 and the groove bottom of the attachment groove 27. The to-be-attached part 34 is fixed to the attaching part 24 because the retaining piece 34a reaches the engaging part 27c and is inserted into the engaging part 27c by elastic force. Here, when the angle α of the bending portion 36b in FIG. 3 does not coincide with the angle γ (180−θ) in the vicinity of the stepped portion 27a with respect to the closing portion 31, the attached portion 34 has a bending portion 36b. Is elastically deformed in the gap with the stepped portion 27a, whereby the closing portion 31 can be brought into close contact with the seat surface 23a.

(2) -4 Operation of Check Valve Next, the operation of the check valve 20 will be described. As shown in FIGS. 1 and 4, during refueling, the fuel that has entered from the inlet 21 c of the passage forming member 21 reaches the outlet 21 b through the passage 21 a and pushes the closing portion 31 of the valve plate 30. As shown in FIG. 5, the valve plate 30 is attached to the attachment portion 24 of the passage forming member 21 by the attached portion 34, so that the valve plate 30 is opened with the connection portion of the attached portion 34 and the elastic deformation portion 36 as a fulcrum. . That is, when the closing part 31 is pushed by the fuel, the closing part 31 is inclined with respect to the elastic deformation part 36 and is bent between the elastic deformation part 36 and the outlet 21b. A gap is formed and fuel flows out. At this time, when the opening angle of the closing portion 31 reaches the predetermined angle β, the opening angle of the closing portion 31 is regulated by the closing portion 31 coming into contact with the regulating surface 28a of the opening degree regulating portion 28.

(3) According to the check valve according to the above embodiment, the following actions and effects can be obtained.
(3) -1 When the fluid force is applied to the closing portion 31, the elastically deforming portion 36 of the valve plate 30 maintains a bent state by a predetermined angle α with the connection portion with the attached portion 34 as a fulcrum. On the other hand, by elastically deforming, it acts as a spring that applies a biasing force in the direction in which the closing portion 31 is seated on the seat portion, so that the configuration can be simplified without requiring a coil spring or the like.

(3) -2 When the opening angle of the closing portion 31 reaches the predetermined angle β, the valve plate 30 opens the closing portion 31 by the elastic deformation portion 36 of the closing portion 31 hitting the restricting surface 28a of the opening restricting portion 28. The angle is regulated. Therefore, the closing portion 31 does not open too much, does not plastically deform at the connecting portion between the closing portion 31 and the attached portion 34, has excellent durability, and can reliably perform the closing operation of the closing portion 31. . Here, the angle β is preferably 30 to 60 ° in consideration of the above-described effects, that is, the flow rate of the fluid and the plastic deformation resistance.

(3) -3 Since the opening degree restricting portion 28 is integrally formed with the mounting portion 24, the number of parts does not increase and the configuration is simple.

(3) -4 The elastic deformation portion 36 of the valve plate 30 increases the distance between the outlet 21b and the closing portion 31 by the length from the connecting portion of the attached portion 34 when elastically deforming. The space through which the liquid flows from the outlet 21b becomes wider. Therefore, the elastic deformation portion 36 can be opened by being elastically deformed with a small load, and the pressure loss is small, and the fuel can be supplied smoothly.

(3) -5 Since the passage forming member 21 includes the inclined portion 23 inclined at a predetermined angle with respect to the passage 21a and increases the area of the outlet 21b, the passage forming member 21 is large even if the opening of the closing portion 31 is small. The flow path area can be secured, the pressure loss is small, and the fuel can be supplied smoothly.

(3) -6 Since the elastically deforming portion 36 is constituted by two arms 36a arranged in parallel, even if a twisting force is applied to the closing portion 31, a reaction force is generated in a direction to eliminate the twist, Therefore, the closing part 31 is quickly returned to the original position. Therefore, the flutter of the closing part 31 can be suppressed.

(3) -7 The valve plate 30 is provided with an elastic deformation portion 36 between the closing portion 31 and the attached portion 34, and is elastically deformed from a connecting portion of the elastic deformation portion 36 on the attached portion 34 side. The valve is not opened with the portion 31 where the seat 31 hits the seat surface 23a as a fulcrum. Therefore, it is possible to obtain a smooth valve opening operation without being caught at a portion where the end portion of the closing portion 31 and the elastic deformation portion 36 are connected.

(3) -8 When the angle 34 of the bending portion 36b of FIG. 3 does not coincide with the angle γ in the vicinity of the stepped portion 27a with respect to the closing portion 31, the attached portion 34 changes the stepped portion 36b to the stepped portion 31. The closing portion 31 can be brought into close contact with the seat surface 23a by being elastically deformed in the gap with the 27a. That is, the bending portion 36b can be finely adjusted by itself without receiving a bending force that directly hits the outer peripheral surface of the passage forming member 21 and deviates from a predetermined angle due to the gap with the stepped portion 27a.

(3) -9 Since the attachment portion 24 restricts both sides of the attachment portion 34 with the restriction wall 25a of the side wall portion 25, the attachment portion 34 can be prevented from rattling.

(4) Other Embodiments The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

(4) -1 In the above embodiment, the elastic deformation portion 36 is configured by two parallel arms 36a. However, the elastic deformation portion 36 is not limited to this, and may be one, or three or more as long as it is easily deformable. You may comprise with an arm.

(4) -2 FIG. 8 is a cross-sectional view showing a check valve according to another embodiment. The present embodiment is characterized by the shape of the regulating surface 28Ba of the opening degree regulating portion 28B. That is, the regulation surface 28Ba is formed as a curved surface that is curved from the lower part. When the check valve 20B is opened, the elastically deforming portion 36B of the valve plate 30B bends uniformly along the regulating surface 28Ba, so that excessive stress is not applied to the connecting portion with the attached portion 34B. Plastic deformation does not occur in the part.

(4) -3 FIG. 9 is a perspective view showing a check valve 20C according to still another embodiment, and FIG. 10 is a cross-sectional view showing the check valve 20C. The present embodiment is characterized by a stopper mechanism that prevents a decrease in sealing performance due to the displacement of the valve plate 30C. The outlet 21Cb side of the passage forming member 21C has an inclined portion 23C inclined with respect to the axis of the passage forming member 21C, and the outlet 21Cb has an oval shape corresponding to the inclined portion 23C. The stopper mechanism includes a locking portion 29Ca formed at the opening peripheral edge portion of the outlet 21Cb of the passage forming member 21C, and a locked portion 37Ca protruding from the outer peripheral portion of the closing portion 31C of the valve plate 30C. Yes. The locking portion 29Ca is formed by a pressure receiving surface that protrudes at a predetermined angle with respect to the inclined portion 23C. The locked portion 37Ca is provided between the outer peripheral portion of the closing portion 31C and the elastically deforming portion 36C and hits the locking portion 29Ca so that the closing portion 31C regulates the movement along the inclined portion 23C. It is configured.

  As shown in FIG. 10, in the configuration of the check valve 20C, when a flow in the direction d1 from the fuel tank toward the check valve 20C occurs and hits the closing portion 31C of the valve plate 30C, the closing portion 31C It receives a force in the direction d2 that causes a positional deviation along the sheet surface 23Ca of 23C. The closing portion 31C that has received such a force is restrained from being displaced when the locked portion 37Ca hits the locking portion 29Ca. Therefore, it is possible to prevent a decrease in sealing performance due to the positional deviation of the closing portion 31C.

  Further, as shown in FIG. 9, the locked portion 37Ca of the valve plate 30C is formed in a plane perpendicular to the direction d3 to be inserted into the mounting portion 24C when the valve plate 30C is mounted. If the stop portion 37Ca is pushed, the valve plate 30C can be easily assembled to the mounting portion 24C.

(4) -4 FIG. 11 is a sectional view showing a check valve 20D according to another embodiment. This embodiment is a modification of the stopper mechanism shown in FIGS. That is, in the stopper mechanism, the locked portion 37Da is formed of a protruding piece bent from the outer peripheral portion of the closing portion 31D of the valve plate 30D. In other words, the locked portion 37Da has an outer peripheral end locking portion 29Da provided on the side opposite to the mounting portion 24D of the passage forming member 21D when the closing portion 31D receives a force in the direction along the inclined portion 23D. By engaging with, it is possible to prevent displacement of the closing portion 31D.

(4) -5 FIG. 12 is a cross-sectional view showing a check valve 20E according to still another embodiment. The passage forming member according to the embodiment shown in FIG. 1 and the like has a configuration in which the outlet side is an inclined portion, but as shown in FIG. 12, the outlet 21Eb side of the passage forming member 21E is the side of the passage forming member 21E. It may be a valve plate 30E that opens and closes the outlet 21Eb formed at a right angle to the axis. Even with the shape of the passage forming member 21E in the present embodiment, there are effects such as that the elastic deformation portion 36E of the valve plate 30E can be elastically deformed with a small load to be opened.

DESCRIPTION OF SYMBOLS 10 ... Fuel tank pipe connection body 12 ... Passage formation part 12a ... Passage part 12b ... Prevention extension part 12c ... Flange 14 ... Connection welding part 14a ... Outer cylinder part 14b ... Flange 14c ... Weld end 16 ... Reinforcement pipe 16a ... Pipe Main body 16b ... Stopping part 16c ... Stopping piece 20 ... Check valve 20B ... Check valve 20C ... Check valve 20D ... Check valve 20E ... Check valve 21 ... Passage forming member 21C ... Passage forming member 21D ... Passage forming member 21E ... Passage forming member 21a ... Passage 21b ... Outlet 21c ... Inlet 21Cb ... Outlet 21Eb ... Outlet 23 ... Inclined part 23C ... Inclined part 23D ... Inclined part 23a ... Seat surface 23Ca ... Seat surface 24 ... Installation part 24C ... Installation Part 24D: Mounting part 25 ... Side wall part 25a ... Restriction wall 25b ... Back wall 26 ... Bridge part 27 ... Mounting groove 27a ... Step part 27b ... Insertion hole 27c ... Joint part 28 ... Opening restriction part 28B ... Opening restriction part 28a ... Restriction surface 28Ba ... Restriction surface 29Ca ... Locking part 29Da ... Locking part 30 ... Valve plate 30B ... Valve plate 30C ... Valve plate 30D ... Valve plate 30E ... Valve plate 31 ... Closed portion 31C ... Closed portion 31D ... Closed portion 34 ... Mounted portion 34B ... Mounted portion 34a ... Removal piece 36 ... Elastic deformation portion 36B ... Elastic deformation portion 36C ... Elastic deformation portion 36E ... Elastic deformation portion 36a ... Arm 36b ... Curved portion 37Ca ... Locked portion 37Da ... Locked portion CP ... Clamp FC ... Fuel cap FN ... Filler neck FS ... Fueling device FT ... Fuel tank FTa ... Tank opening H ... Inlet hose IP ... Inlet pipe

Claims (9)

A passage forming member (21) having a passage (21a) and an outlet (21b) for flowing out the fluid flowing through the passage (21a), and the outlet ( In a check valve comprising a valve plate (30) for opening and closing 21b),
The passage forming member (21) includes an attachment portion (24) formed on the outer peripheral portion of the passage forming member (21) for attaching the valve plate (30),
The valve plate (30) includes a closing portion (31) for opening and closing the outlet (21b), a mounted portion (34) for mounting the valve plate (30) to the mounting portion (24), and An elastically deformable portion (36) that connects one end of the outer periphery of the closing portion (31) and the attached portion (34) and is bent at a predetermined angle with respect to the closing portion (31),
The attachment part (24) has an opening degree restricting part (28) formed on the opening end side of the outlet (21b), and the opening restricting part (28) is formed by the closing part (31). When pressed by the fluid flowing through the passage (21a), the bent portion is substantially maintained at the predetermined angle with the connecting portion between the elastically deformable portion (36) and the mounted portion (34) as a fulcrum. A space that is elastically deformed so that the closing portion (31) opens is formed, and the angle at which the closing portion (31) opens with respect to the outlet (21b) is restricted when the elastic deformation portion (36) hits. Having a regulating surface (28a),
Check valve characterized by. The check valve according to claim 1,
The elastic deformation part (36) is a check valve provided with an arm (36a) arranged in parallel. The check valve according to claim 1 or 2,
The elastically deformable portion (36) has a curved portion (36b) that is curved to bend at an angle between the closed portion (31) and the attached portion (34), and the passage forming member (21) is In the closed state of the closing portion (31), the step portion (27a) that forms a gap between the outer peripheral surface of the passage forming member (21) and the curved portion (36b) is reversed. Stop valve. The check valve according to any one of claims 1 to 3,
The regulation surface (28Ba) is a check valve that is a curved surface following the elastic deformation of the elastic deformation portion 36B. The check valve according to any one of claims 1 to 4,
The outlet (21Cb) side of the passage forming member (21C) includes an inclined portion (23C) inclined with respect to the axis of the passage forming member (21C), and the outlet (21Cb) is formed in an oval shape. Check valve that has been. The check valve according to claim 5,
The passage forming member (21C) includes a locking portion (29Ca) formed on the opening peripheral edge of the outlet (21Cb),
The valve plate (30C) protrudes from the outer peripheral portion of the closing portion (31C) and hits the locking portion (29Ca), whereby the closing portion (31C) moves along the inclined portion (23C). Check valve provided with a locked portion (37Ca) that regulates the pressure. The check valve according to claim 6,
The locking portion (29Ca) is a pressure receiving surface that protrudes at a predetermined angle with respect to the inclined portion (23C),
The locked portion (37Ca) is provided between the outer peripheral portion of the closing portion (31C) and the elastic deformation portion (36C), and is bent with respect to the elastic deformation portion (36C). A check valve that is a pressing surface that hits the locking portion (29Ca). The check valve according to claim 6,
The locking portion (29Da) is an outer peripheral portion of the passage forming member (21D) and provided on the opposite side of the mounting portion (24D),
The said to-be-latched part (37Da) bends from the outer peripheral part of the said closing part (31D), and is a non-return valve which is a protrusion piece which hits the said latching | locking part (29Da). The check valve according to claim 4,
A check valve formed on the outlet (21Eb) side of the passage forming member (21E) at a right angle to the axis of the passage forming member (21E).

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