JP2009202835A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve capable of obtaining a means for preventing the excessive opening of the closing portion 31 of a valve plate 30 by a simple constitution without increasing the number of components. <P>SOLUTION: This check valve 20 includes a passage forming member 22, and the valve plate 30 attached to a mounting portion 27 on the periphery of the passage forming member 22. The valve plate 30 has the closing portion 31 for opening and closing an outflow port 23a, a mounted portion 34 formed by being bent from the periphery of the valve plate 30 and attached to the mounting portion 27, and a stopper 36 formed from the periphery of the closing portion 31, and the closing portion 31 is integrally formed by being bent from a thin plate having elasticity for applying a pressing force in a valve closing direction. The periphery of the passage forming member 22 is formed with an opening regulating portion 29 for regulating the opening angle of the closing portion 31 by being engaged with the stopper 36 when the closing portion 31 reaches a predetermined angle. <P>COPYRIGHT: (C)2009,JPO&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. Various means for preventing the closing body from opening too much have been studied.

JP2007-245824

  The present invention solves the above-described problems of the prior art, and realizes means for preventing the valve plate closing portion for opening and closing the outlet from opening too much with a simple configuration without increasing the number of parts. An object of the present invention is to provide a check valve capable of performing the above.

  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 including a passage and an outflow port through which a fluid flows out from 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 for attaching the valve plate,
The valve plate includes a closing portion that opens and closes the outlet, and a mounted portion that is bent from an outer peripheral portion of the valve plate and is attached to the mounting portion, and the closing portion is pushed by the fluid Sometimes it is configured to open the outlet by tilting the mounted part as a fulcrum,
Furthermore, it comprises an opening angle restricting means for restricting an angle at which the outlet is opened when the closing portion is inclined at the fulcrum,
The opening angle restricting means includes a stopper portion bent from an end portion of the closing portion, and an opening formed on an outer peripheral portion of the passage forming member to restrict the opening angle by engaging with the stopper portion. With a regulatory department,
It is characterized by.

  In the check valve described in Application Example 1, the outlet of the passage formed in the passage forming member is opened and closed with a valve plate. The valve plate uses an elastic thin plate to integrally form the closed portion and the attached portion bent from a part of the outer periphery of the closed portion, and the attached portion is attached to the attachment portion of the passage forming member. ing. The mounted portion acts as a spring that applies a biasing 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 attached portion is closed by tilting with a connection portion with the closing portion as a fulcrum. Open the part and operate. 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 angle restricting means. That is, the opening angle restricting means restricts the opening angle of the closing portion when the stopper portion formed at the end of the closing portion hits the opening degree restricting portion of the passage forming member. Therefore, the closing portion can be reliably closed without plastic deformation at the connecting portion between the closing portion and the attached portion.

  Further, the opening angle restricting means is formed by cutting and raising the stopper portion of the valve plate from the outer peripheral portion of the closing portion, and the opening degree restricting portion is formed on the outer peripheral portion of the passage forming member. There is no increase and the configuration is simple.

As another application example, the opening restriction portion includes a restriction main body protruding from an outer peripheral portion of the passage forming member, and a slide hole that is formed through the restriction main body and is slidably inserted through one end of the stopper portion. It can take the composition provided with.
As still another application example, the stopper portion includes a locking piece obtained by cutting and raising a part of the stopper portion, and the locking piece slides when the closing portion opens to the opening angle. It can be configured to engage the opening edge of the hole.
Furthermore, as another application example, the closing portion may be formed in a substantially disk shape, and the stopper portion may be disposed on the opposite side of the attachment portion with respect to the center of the closing portion. it can.

(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 tank connected to one end of the inlet hose H A fuel tank pipe connector 10 welded to the FT and a check valve attached to 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. Note that a breather pipe (not shown) is connected to the fuel tank FT at the filler neck FN. 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
FIG. 2 is an enlarged cross-sectional view of the fuel tank pipe connector 10 and the check valve 20 of the fuel tank FT. The fuel tank pipe connector 10 includes a passage forming portion 12 and a welding portion 14 for connection, which are integrally formed by two-color molding. 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 12 c is a surface that is welded to the inner wall of the connecting weld portion 14, and the other surface is a weld portion 12 d for welding one end of the check valve 20. 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.

(2) -3 Configuration of Check Valve 20 The check valve 20 includes a cylindrical passage forming member 22 and a valve plate 30 that is attached to one end of the passage forming member 22 and opens and closes the outlet 23a. Yes. The passage forming member 22 has a cylindrical shape formed from the same PA as the passage forming portion 12, and has a passage 22a connected to the inlet hose H therein, and the inlet hose H side is an inflow port 23b. . A flange 25 is provided at the end of the inlet 23b of the passage forming member 22, and a flow path is formed integrally with the welded portion 12d of the passage forming portion 12 by welding.

  FIG. 3 is an enlarged sectional view showing a state before the valve plate 30 is assembled to the passage forming member 22. A seat step portion 26 to which the valve plate 30 is attached and detached is formed in a substantially annular shape along the outer peripheral edge portion of the outlet 23 a of the passage forming member 22. The bottom surface of the sheet step portion 26 is a sheet surface 26a. Further, a mounting portion 27 for mounting the valve plate 30 projects from the outer peripheral portion of the outlet 23 a of the passage forming member 22. In addition, an opening degree restricting portion 29 (opening angle restricting means) for restricting excessive opening of the valve plate 30 is formed on the outer peripheral portion of the passage forming member 22 on the side opposite to the attachment portion 27. In addition, the structure of the attachment part 27 and the opening degree control part 29 is mentioned later.

  4 is a perspective view showing a state in which the valve plate 30 is removed from the passage forming member 22, FIG. 5 is a sectional view showing the vicinity of the valve plate 30, FIG. 6 is a plan view showing the valve plate 30, and FIG. It is the figure seen from arrow AD. The valve plate 30 is formed by press-cutting a metal thin plate and bending it so that the closing portion 31, the arm portions 32 and 32, the connecting portions 33 and 33, the attached portion 34 and the stopper portion 36 are integrated into a leaf spring. Is formed.

  The closing portion 31 has substantially the same shape as the outer shape of the seat surface 26a, and opens and closes the outlet 23a of the passage forming member 22. That is, the closing portion 31 is formed so as to be attached to and detached from the seat surface 26a. The arm portions 32 and 32 are formed so as to surround a substantially semicircle of the outer peripheral portion of the closing portion 31. Each of the one end portions of the arm portions 32 and 32 is connected to the closing portion 31 via the connecting portions 33 and 33, and each of the other end portions is connected to the attached portion 34. The attached portion 34 is a portion that supports the closing portion 31 so as to be opened and closed by being inserted into the attaching portion 27 of the passage forming member 22, and is bent with respect to the closing portion 31. As shown in FIG. 3, the attached portion 34 is 10 ≦ β−α ≦ 20, where α is the angle formed with respect to the closing portion 31 and β is the angle of the opening peripheral edge of the outlet 23 a of the passage forming member 22. It is bent to be in the range of ゜. This is because if the angle (β−α) is greater than 20 °, the force with which the closing portion 31 presses against the seat surface 26a increases, and it is not possible to ensure a fuel outflow amount greater than or equal to a predetermined value. If the angle is less than 10 °, the force that the closing portion 31 presses against the seat surface 26a becomes small, and the valve plate 30 is caused to vibrate due to the vibration of the vehicle, so that abnormal noise is likely to occur.

  FIG. 8 is an enlarged cross-sectional view of the vicinity of the attachment portion 27 of the passage forming member 22 and the attachment portion 34 of the valve plate 30. As shown in FIG. 4 and FIG. 8, the attachment portion 27 includes side wall portions 27 a and 27 a erected substantially in parallel from the outer peripheral portion of the passage forming member 22. Each side wall portion 27a includes a standing wall 27b and a pressing portion 27c extending from the upper end of the standing wall 27b so as to face each other, and is formed in an L-shaped cross section by the standing wall 27b and the pressing portion 27c. A bridge portion 27d is formed across the holding portions 27c and 27c. Further, between the side wall portions 27a and 27a, there is an attachment groove 28 for accommodating the attached portion 34. An inclined surface 28b that is inclined upward from the insertion port 28a toward the back side is formed at the bottom of the mounting groove 28, and the insertion workability of the mounted portion 34 is enhanced. Further, an engaging portion 28c formed in a recess from one end of the inclined surface 28b is formed.

  On the other hand, the attached portion 34 of the valve plate 30 includes a rectangular main body plate 34a, a retaining portion 34b, and an elastic piece 34c. The retaining portion 34b and the elastic piece 34c are formed by being cut and raised at about 45 ° from the main body plate 34a by press molding or the like. The retaining portion 34 b engages with the engaging portion 28 c to prevent the attached portion 34 from being removed from the attaching portion 27, and the elastic piece 34 c is a groove bottom between the pressing portion 27 c and the attaching groove 28. The backlash in the radial direction is suppressed by compressing with.

  In order to attach the attached portion 34 of the valve plate 30 to the attaching portion 27 of the passage forming member 22, the attached portion 34 is inserted into the insertion port 28a along the inclined surface 28b. While the retaining portion 34 b and the elastic piece 34 c are compressed between the bridge portion 27 d and the groove bottom of the mounting groove 28, the mounted portion 34 is inserted into the back side of the mounting groove 28. The to-be-attached part 34 is fixed to the attaching part 27 by the retaining part 34b reaching the engaging part 28c and being inserted into the engaging part 28c by elastic force.

  4 and 5, the check valve 20 includes an opening angle restricting means for restricting the valve plate 30 to open with respect to the passage forming member 22 at a predetermined opening θ or less. The opening angle restricting means includes a stopper portion 36 bent at the lower portion of the valve plate 30 and an opening degree restricting portion 29 engaged with the stopper portion 36. The stopper portion 36 includes a connecting piece 36a formed downward from the lower portion of the closing portion 31, a slide piece 36b obtained by bending the connecting piece 36a substantially at a right angle, and a engagement piece obtained by bending the other end of the slide piece 36b at a substantially right angle. A stop piece 36c is provided, and these are formed in an L shape. On the other hand, the opening degree restriction portion 29 includes a restriction main body 29 a that protrudes downward from the lower portion of the passage forming member 22. A slide hole 29b is formed through the restriction main body 29a. The slide hole 29b holds the slide piece 36b in a slidable manner, and can be inserted when the locking piece 36c is elastically deformed. Therefore, the opening angle regulating means elastically deforms the locking piece 36c with respect to the slide piece 36b so as to reduce the angle, and when the locking piece 36c is inserted into the slide hole 29b, the locking piece 36c is elastically applied. It is assembled by restoring. When the closing portion 31 is tilted about the fulcrum of the attached portion 34 in the assembled state, the slide piece 36b slides on the slide hole 29b and the locking piece 36c hits the opening end of the slide hole 29b. The opening angle of the closing part 31 is regulated.

(2) -4 Operation of Check Valve 20 Next, the operation of the check valve 20 will be described. As shown in FIG. 9, during refueling, the fuel that has entered from the inlet 23 b of the passage forming member 22 reaches the outlet 23 a through the passage 22 a and pushes the closing portion 31 of the valve plate 30. Since the valve plate 30 is attached to the attachment portion 27 of the passage forming member 22 by the attached portion 34, the valve plate 30 is opened using the attached portion 34 as a fulcrum. That is, when the closing portion 31 is pushed by the fuel, the closing portion 31 is inclined with respect to the arm portions 32 and 32 around the connecting portions 33 and 33 to form a gap between the outlet 23a and the fuel. Leaks. At this time, when the opening angle of the closing portion 31 reaches the predetermined angle θ, the opening angle of the closing portion 31 is regulated by the locking piece 36c of the stopper portion 36 hitting the opening end of the opening degree regulating portion 29.

(3) According to the check valve 20 according to the above embodiment, the following actions and effects can be obtained.
(3) -1 When the opening angle of the closing portion 31 reaches the predetermined angle θ, the valve plate 30 has an opening angle of the closing portion 31 because the locking piece 36c of the stopper portion 36 hits the end of the opening degree restricting portion 29. Is regulated. Therefore, since the closing part 31 does not open too much and does not plastically deform at the connecting portion between the closing part 31 and the attached part 34, the closing operation of the closing part 31 can be performed reliably.
(3) -2 The stopper portion 36 of the valve plate 30 is formed by being cut and raised from the outer peripheral portion of the closing portion 31, and the opening degree restricting portion 29 is formed on the outer peripheral portion of the passage forming member 22. The configuration is simple without increasing the score.
(3) -3 The opening angle θ of the closing portion 31 of the valve plate 30 is desirably set to 30 ° ≦ θ ≦ 50 °. This is because if the angle θ is larger than 50 °, the connecting portion between the closing portion 31 and the mounted portion 34 is likely to be plastically deformed. If the angle θ is smaller than 30 °, the amount of fuel outflow cannot be set large. is there.

(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 FIG. 10 is a perspective view showing a valve plate 30B according to another embodiment. In the present embodiment, a stopper portion 36B is formed at the lower end of the closing portion 31B, and the locking piece 36Bc of the stopper portion 36B is cut and raised from a part of the slide piece 36Bb. The stopper portion is not limited to the lower end of the closing portion, and may be formed on both sides. In any case, various shapes and configurations can be adopted as long as the opening angle of the closing portion can be regulated.

(4) -2 The closing part of the valve plate can take various shapes in accordance with the shape of the fuel passage. In addition to the circle and the fan shape divided as described above, the valve plate can be a polygon such as a triangle or a rectangle. It may be formed. Although stainless steel was used as the material for the valve plate, the material is not limited to this, and any material having spring characteristics may be used. For example, resin may be used.

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 pipe connection body for fuel tanks and the check valve were expanded. It is sectional drawing which expands and shows the state before attaching a valve plate to a channel | path formation member. It is a perspective view which shows the state which removed the valve plate from the channel | path formation member. It is sectional drawing which shows the state which attached the valve plate to the channel | path formation member. It is a top view which shows a valve plate. It is the figure seen from arrow AD of FIG. It is sectional drawing to which the vicinity of the attachment part of a channel | path formation member and the to-be-attached part of a valve plate was expanded. It is explanatory drawing explaining operation | movement of a non-return valve. It is a perspective view which shows the valve plate concerning another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Fuel tank pipe connection body 12 ... Passage formation part 12a ... Passage part 12b ... Prevention extension part 12c ... Flange 12d ... Welding part 14 ... Welding part for connection 14a ... Outer cylinder part 14b ... Flange 14c ... Welding end 20 ... Reverse Stop valve 22 ... Passage forming member 22a ... Passage 23a ... Outlet 23b ... Inlet 25 ... Flange 26 ... Seat step part 26a ... Seat surface 27 ... Mounting part 27a ... Side wall part 27b ... Standing wall 27c ... Holding part 27c ... Holding part 27d ... Bridge part 28 ... Mounting groove 28a ... Insertion port 28b ... Inclined surface 28c ... Engagement part 29 ... Opening restriction part 29a ... Regulation body 29b ... Slide hole 30 ... Valve plate 30B ... Valve plate 31 ... Closed part 31B ... Closed part 32 ... Arm portion 33 ... Connecting portion 34 ... Mounted portion 34a ... Main body plate 34b ... Stopping portion 34c ... Elastic piece 36 ... Stopper portion 36B Stopper 36a ... Connecting piece 36b ... Slide piece 36c ... Locking piece 36Bb ... Sliding piece 36Bc ... Locking piece CP ... Clamp FC ... Fuel cap FN ... Filler neck FS ... Fueling device FT ... Fuel tank FTa ... Tank opening H ... Inlet Hose IP ... Inlet pipe

Claims (4)

A passage-forming member (22) having a passage (22a) and an outlet (23a) through which fluid flows out from the passage (22a), and the outlet (23a) formed by cutting and bending an elastic thin plate A check valve comprising a valve plate (30) for opening and closing
The passage forming member (22) includes an attachment portion (27) for attaching the valve plate (30),
The valve plate (30) has a closing part (31) that opens and closes the outlet (23a), and a mounted part that is bent from the outer periphery of the valve plate (30) and is attached to the attachment part (27). Part (34), and when the closing part (31) is pushed with the fluid, the outlet part (23a) is opened by tilting with the attached part (34) as a fulcrum,
Furthermore, an opening angle restricting means for restricting an angle of opening the outlet (23a) when the closing portion (31) is inclined at the fulcrum is provided,
The opening angle restricting means is formed at the outer periphery of the stopper portion (36) bent from the end of the closing portion (31) and the passage forming member (22) and hits the stopper portion (36). And an opening degree restricting part (29) for restricting the opening angle.
Check valve characterized by. The check valve according to claim 1,
The opening degree restricting portion (29) includes a restricting body (29a) projecting from the outer periphery of the passage forming member (22) and one end of the stopper portion (36) formed through the restricting body (29a). A check valve provided with a slide hole (29b) that is slidably inserted therethrough. The check valve according to claim 2,
The stopper portion (36) includes a locking piece (36c) obtained by cutting and raising a part of the stopper portion (36), and the locking piece (36c) is formed up to the opening angle of the closing portion (31). A check valve configured to engage with the opening edge of the slide hole (29b) when opened. The check valve according to any one of claims 1 to 3,
The closing part (31) is formed in a substantially disc shape,
The stopper portion (36) is a check valve disposed on the opposite side of the attachment portion (27) with respect to the center of the closing portion (31).

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