JP2007245824A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve excellent in assembling workability without assembling it erroneously to a mounting part 27 of a passage forming member 22. <P>SOLUTION: This check valve 20 is provided with the passage forming member 22 and a valve 30 mounted at the mounting part 27 of the passage forming member 22 and to open and close an outflow port 23a. The valve plate 30 is mounted to the mounting part 27 formed at the passage forming member 22. The mounting part 27 is has a mounting groove 29 formed on an outer peripheral part of the passage forming member 22 and to store a mounted part 34 and a bridge 28c to position the mounted part 34 stored in the mounted part 34 by passing a part of an upper part of the mounting groove 29. <P>COPYRIGHT: (C)2007,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 having a passage and an outflow port through which fluid 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 can be opened and closed by bending the attached part at one end of the closing part and inserting this attached part into a slit in which a part of the outer periphery of the passage forming member is cut out. I support it.

  However, with this check valve, the valve plate may be assembled with the valve plate tilted in error when the mounted portion of the valve plate is inserted into the slit. There was a problem that it was not good.

JP-A-8-268092 (FIG. 24)

  An object of the present invention is to solve the above-described problems of the prior art, and to provide a check valve excellent in assembling workability without erroneous assembly.

The check valve according to the present invention made to solve the above problems is
A check valve comprising a passage and a passage forming member provided with an outflow port through which fluid flows out from the passage, and a valve plate attached to a mounting portion formed on an outer peripheral portion of the passage forming member and opening and closing the outflow port In
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 biased in the valve closing direction. Formed integrally from a thin plate having elasticity,
The attached portion includes a flat main plate and a retaining portion protruding from the main plate,
The mounting portion is formed on an outer peripheral portion of the passage forming member, and a mounting groove for storing the mounting portion, and the mounting portion stored in the mounting portion by crossing a part of the upper portion of the mounting groove. And an engaging portion that is formed facing an opening in which the bridge portion is not formed in the upper portion of the mounting groove and engages with the retaining portion. .

  In the check valve according to the present invention, the outlet of the passage formed in the passage forming member is opened and closed by 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 part acts as a spring that applies a biasing force in the direction in which the closing part is seated on the seat part. Open the part.

Further, the mounting portion for mounting the mounted portion of the valve plate includes a mounting groove formed on the outer peripheral portion of the passage forming member and housing the mounted portion, and the mounted portion by crossing a part of the upper portion of the mounting groove. And a bridge portion for positioning the attached portion housed in the housing. The bridge portion can position the mounted portion of the valve plate housed in the mounting groove by a simple configuration that crosses a part of the upper portion of the mounting groove.
Further, since the mounted portion of the valve plate is housed in the mounting groove and positioned by the bridge portion, there is no possibility of incorrect assembly such that the valve plate is mounted in a tilted state.
Furthermore, since the bridge part crosses only a part of the mounting groove and the other part of the mounting groove is opened, the mounting part stored in the mounting groove can be visually recognized from the outside, and incorrect assembly is ensured. Can be prevented.
In addition, the retaining portion of the attached portion can be easily formed by punching such as a press, and the engaging portion can be undercut using a slide mold through the opening at the top of the mounting groove in injection molding. And can be easily formed.

  Further, as a preferred configuration of the present invention, the mounting portion includes a side wall portion standing substantially parallel to the outer peripheral portion of the passage forming member and forming the mounting groove therebetween, and the bridge portion includes both of the above-described bridge portions. The structure currently formed over a side wall part can be taken. With this configuration, the attachment portion can be easily formed on the outer peripheral portion of the passage forming member by injection molding. The mounting groove may be formed as a recess in the outer periphery of the passage forming member.

  Further, as a preferred aspect of the present invention, the retaining portion is formed by cutting and raising a part of the mounted portion, while the engaging portion is a recess formed in the mounting groove and engaged with the retaining portion. Can be configured according to the location.

  As a preferred aspect of the attached portion, the attaching portion includes a pressing portion that protrudes along at least a part of both sides of the attaching groove, and the attached portion is one of the attached portions. An elastic piece formed by cutting and raising the portion, and the elastic piece is compressed between the pressing portion and the groove bottom of the attachment groove to prevent the attachment portion from being removed from the attachment portion. Can be configured. With this configuration, it is possible to prevent backlash in the radial direction by using the elastic force of the elastic piece.

  Furthermore, as a preferable aspect of the valve plate, it is possible to adopt a configuration including an arm portion that surrounds at least a part of the closing portion and connects the closing portion and the mounting portion.

  Further, as a preferred aspect of the present invention, the valve plate is configured such that the angle between the closed portion and the mounted portion is α and the outlet of the passage forming member in a state where the valve plate is removed from the mounting portion. When the angle between the peripheral edge of the opening and the mounting portion is β, a configuration in which 10 ° ≦ β−α ≦ 20 ° can be adopted. Such an angle is preferable because if the angle (β−α) is greater than 20 °, the force that the closing portion presses against the seat surface increases, and it is not possible to secure a flow rate that exceeds a predetermined flow rate. On the other hand, if the angle (β−α) is smaller than 10 °, the force with which the closing portion presses against the seat surface becomes small, and the valve plate due to the vibration of the vehicle vibrates and is likely to generate abnormal noise. .

(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 20 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 cross-sectional view showing a state before the valve plate 30 is assembled from 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 upper part of the sheet step portion 26 is a sheet surface 26a, and the outer peripheral portion thereof is an outer peripheral surface 26b. 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. A structure for attaching the valve plate 30 to the attachment portion 27 will be described later.

4 is a plan view showing the valve plate 30, and FIG. 5 is a view as seen from the arrow AD in FIG. The valve plate 30 is formed by press-cutting a metal thin plate to integrally form the closing portion 31, the arm portions 32 and 32, the connecting portions 33 and 33, and the attached portion 34 as a leaf spring.
The closing portion 31 has substantially the same shape as the outer shape of the sheet step portion 26 shown in FIG. 3, and opens and closes the outlet 23a of the passage forming member 22. That is, the closing portion 31 is attached to the seat surface 26a of the sheet step portion 26. It is formed so as to be separated.
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 shown in FIG. 3, 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.

(2) -4 Operation of Check Valve 20 Next, the operation of the check valve 20 will be described. As shown in FIG. 6, 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 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.

(2) -5 Attachment Structure of Valve Plate 30 FIG. 7 is an enlarged 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, and FIG. 8 is an attachment portion 27 of the passage formation member 22. It is a perspective view which shows the state which removed the valve plate 30 from. The attachment portion 27 includes side wall portions 28, 28 erected substantially in parallel from the outer peripheral portion of the passage forming member 22. Each side wall portion 28 includes a standing wall 28a and a pressing portion 28b extending from the upper end of the standing wall 28a so as to face each other, and is formed in an L-shaped cross section by the standing wall 28a and the pressing portion 28b. A bridge portion 28c is formed across the holding portions 28b and 28b. The bridge portion 28c is curved upward and is formed so as not to reduce the space of the mounting groove 29 due to resin-molded sink marks.
Further, between the side wall portions 28, 28 is an attachment groove 29 for accommodating the attached portion 34. The mounting groove 29 serves as an insertion port 29a for inserting the mounted portion 34 on the valve plate 30 side. An inclined surface 29b that is inclined upward from the insertion port 29a toward the back side is formed at the bottom of the mounting groove 29, thereby enhancing the insertion workability of the mounted portion 34. In addition, an engaging portion 29c formed in a recess from one end of the inclined surface 29b is formed, and a lightening portion 29d is further formed on the back side. A portion of the upper portion of the mounting groove 29 where the bridge portion 28c is not formed is an opening 29e.

  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 serves to prevent the attached portion 34 from being removed from the attaching portion 27 by engaging with the engaging portion 29 c, and the elastic piece 34 c is a groove bottom between the pressing portion 28 b and the attaching groove 29. 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 from the insertion port 29a along the inclined surface 29b. While the retaining portion 34 b and the elastic piece 34 c are compressed between the bridge portion 28 c and the groove bottom of the attachment groove 29, the attached portion 34 is inserted into the back side of the attachment groove 29. The to-be-attached part 34 is fixed to the attaching part 27 by the retaining part 34b reaching the engaging part 29c and being inserted into the engaging part 29c by elastic force.

(3) According to the check valve 20 according to the above embodiment, the following actions and effects can be obtained.

(3) -1 The operation of attaching the valve plate 30 to the passage forming member 22 can be performed by inserting the attached portion 34 of the valve plate 30 into the attachment groove 29 of the attaching portion 27 of the passage forming member 22. Even simple.

(3) -2 The bridge portion 28c of the attachment portion 27 positions the attached portion 34 of the valve plate 30 accommodated in the attachment groove 29 by a simple configuration that crosses a part of the upper portion of the attachment groove 29. Can do. In addition, since the mounted portion 34 of the valve plate 30 is housed in the mounting groove 29 and positioned by the bridge portion 28c, it is misassembled so as to be mounted in an inclined state in the mounting groove 29. There is nothing.

(3) -3 The bridge portion 28c traverses only a part of the attachment groove 29 and opens the other part of the attachment groove 29, so that the attachment portion 27 housed in the attachment groove 29 can be viewed from the outside. It is possible to prevent erroneous assembly.

(3) -4 The mounting portion 27 includes a side wall portion 28 which is provided substantially in parallel with the outer periphery of the passage forming member 22 and forms the mounting groove 29 therebetween, and the bridge portion 28c Since the structure formed over the side wall portion 28 is adopted, the mounting portion 27 can be easily formed on the outer peripheral portion of the passage forming member 22 by injection molding.

(3) -5 Since the engaging portion 29c of the mounting portion 27 is formed at a position different from the bridge portion 28c, it does not become an undercut by using a slide mold through the opening 29e above the mounting groove 29. In addition, it can be easily formed by injection molding.

The present invention is not limited to the above embodiment, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.
The closing portion of the valve plate can take various shapes according to the shape of the fuel passage, and may be formed in a polygon such as a triangle or a quadrangle in addition to a circle or a fan shape divided as described above. .
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 fuel tank pipe connection body and check valve of the fuel tank 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 top view which shows a valve plate. It is the figure seen from arrow AD of FIG. It is explanatory drawing explaining operation | movement of a non-return valve. 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 a perspective view which shows the state which removed the valve plate from the attaching part of the channel | path formation member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Pipe connection body for fuel tanks 12 ... Passage formation part 12a ... Passage part 12b ... Expansion extension part 12c ... Flange 12d ... Welding part 14 ... Welding part 14a for connection ... outer cylinder part 14b ... flange 14c ... welding end 20 ... check valve 22 ... passage forming member 22a ... passage 23a ... outlet 23b ... inlet 25. ..Flange 26 ... Sheet step part 26a ... Seat surface 26b ... Outer peripheral surface 27 ... Mounting part 28 ... Side wall part 28a ... Vertical wall 28b ... Presser part 28c ... Bridge 29 ... Mounting groove 29a ... Insertion port 29b ... Inclined surface 29c ... engagement part 29d ... Thinning part 29e ... Opening 30 ... Valve plate 31 ... Closed part 32 ... Arm part 33 ... Connection part 34 ... Mounted part 34a ... Main body plate 34b ... Detachment part 34c ... Elastic 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 (6)

A passage forming member (22) having a passage (22a) and an outlet (23a) through which fluid flows out from the passage (22a), and an attachment portion (27) formed on the outer peripheral portion of the passage forming member (22) And a check valve provided with a valve plate (30) for opening and closing the outlet (23a).
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 the closing part (31) is integrally formed from a thin plate having elasticity to apply a biasing force in the valve closing direction,
The attached portion (34) includes a flat main plate (34a) and a retaining portion (34b) projecting from the main plate (34a).
The attachment portion (27) includes an attachment groove (29) formed on an outer peripheral portion of the passage forming member (22) and accommodating the attached portion (34), and a part of an upper portion of the attachment groove (29). A bridge part (28c) for positioning the attached part (34) housed in the attached part (34) by traversing and the bridge part (28c) among the upper part of the attaching groove (29) are formed. A check valve comprising: an engaging portion (29c) that faces the opening (29e) that is not formed and engages with the retaining portion (34b). The check valve according to claim 1,
The mounting portion (27) is provided with a side wall portion (28) standing substantially parallel to the outer periphery of the passage forming member (22) and forming the mounting groove (29) therebetween, and the bridge portion (28c). Is a check valve formed across both the side walls (28). The check valve according to claim 2,
The attached portion (34) includes the retaining portion (34b) obtained by cutting and raising a part of the attached portion (34).
The engagement portion (29c) is a check valve that is a recess formed in the attachment groove (29) and engaged with the retaining portion (34b). The check valve according to any one of claims 1 to 3,
The mounting portion (27) includes a pressing portion (28b) projecting along at least a part of both sides of the mounting groove (29),
The attached part (34) includes an elastic piece (34c) formed by cutting and raising a part of the attached part (34), and the elastic piece (34c) includes the pressing part (28b) and the above-described part. A check valve configured to prevent the attached portion (34) from being removed from the attaching portion (27) by being compressed between the bottom of the attaching groove (29). The check valve according to any one of claims 1 to 4,
The valve plate (30) includes an arm portion (32, 32) that surrounds at least a part of the closing portion (31) and connects the closing portion (31) and the mounting portion (27). Stop valve. The check valve according to any one of claims 1 to 5,
In the valve plate (30), the angle between the closed portion (31) and the mounted portion (34) is α and the passage in a state where the valve plate (30) is removed from the mounting portion (27). A check valve which is set to 10 ° ≦ β−α ≦ 20 °, where β is the angle between the opening periphery of the outlet (23a) of the forming member (22) and the mounting portion (27).

Images