JP5040904B2 - Check valve - Google Patents

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 flowing out from an inlet pipe due to an increased tank internal pressure when refueling is stopped (for example, Patent Document 1). The check valve includes a passage forming member having 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.

  Since the conventional check valve does not require a strict sealing property in the closed state, the fuel is accumulated in the passage forming member when the fuel tank is filled to the vicinity of the full tank. The fuel in the passage forming member swings and pushes and opens and closes the valve plate when the vehicle starts suddenly or travels on a step road. Such a closing operation of the valve plate may generate an abnormal noise that is annoying to the occupant.

JP2007-245824

  The present invention is based on solving the above-described problems of the prior art, and increases the number of parts with a simple structure as a means for preventing annoying noise when the valve plate closing portion that opens and closes the outlet is closed. An object of the present invention is to provide a check valve that can be realized without any problems.

  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, a seat surface formed at an opening peripheral edge portion of the outlet, and a seat step portion protruding from the seat surface,
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 closing portion 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,
Further, a part of the outer peripheral portion of the closing portion has a contact portion that hits the seat step portion in the closed state of the closing portion, and the contact portion is a contact that the outer peripheral portion of the closing portion hits the seat surface. It is configured to reduce the area.

  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. And if the force of the fuel which pushes a closing part falls below the force of the valve closing direction which has applied to the closing part, a closing part will close an outflow port.

  Here, it is assumed that the fuel is filled in the fuel tank to the vicinity of the full tank and the fuel is accumulated in the passage forming member. In such a state, when the vehicle starts suddenly or travels on a step road, the fuel in the passage forming member swings and pushes the valve plate to open and close, the contact portion formed integrally with the closing portion is the seat. Hit the step. When the contact portion hits the sheet step portion, the area where the outer peripheral portion of the closing portion excluding the contact portion collides with the opening peripheral edge portion of the outflow port is reduced, and a slight gap is generated between the closing portion and the seat surface. . For this reason, due to the reduction of the collision area and the gap, the collision noise associated with the opening and closing of the closing portion is reduced, the resonance of the passage of the passage forming member is eliminated, and the annoying noise that is annoying to the passenger can be eliminated. The check valve mainly aims to prevent the fuel from blowing back during refueling, and therefore does not require high sealing performance between the closing portion and the seat surface.

  Further, the structure for preventing abnormal noise due to the check valve is the contact step formed on the outer peripheral portion of the closing portion of the valve plate and the seat step portion protruding from the passage forming member, so that the number of parts increases. There is no configuration.

[Application Example 2]
The closing portion of the check valve described in Application Example 2 is formed in a substantially disc shape, and the contact portion protrudes on the opposite side of the mounting portion with respect to the center of the closing portion. is there.

[Application Example 3]
The contact part of the application example 3 is configured to protrude from the outer peripheral part of the closing part.

[Application Example 4]
Application Example 4 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, and a seat surface formed on an opening peripheral edge portion of the outlet.
The valve plate includes a closing portion that opens and closes the outlet, a mounted portion that is bent from the outer peripheral portion of the closing portion and is attached to the mounting portion, and an outlet from a part of the outer peripheral portion of the closing portion. A contact portion bent to the side,
When the closing part is pushed by the fluid, the outlet is opened by tilting with the attached part as a fulcrum, and the contact part hits the seat surface in the closed state of the closing part. Thus, the outer peripheral portion of the closing portion is formed so as to reduce a contact area where it hits the seat surface. As a configuration for avoiding the outer peripheral portion of the closing portion from hitting the entire periphery as in this configuration, a contact portion may be provided to protrude from the outer peripheral portion of the closing valve.

(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 sectional view showing a state before the valve plate 30 is assembled to the passage forming member 22. A seat surface 26a to which the valve plate 30 is attached and detached is formed in a substantially annular shape along the outer peripheral edge of the outlet 23a of the passage forming member 22. A sheet step portion 26b is formed so as to surround the outer periphery of the lower semicircle of the 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. The configuration of the attachment portion 27 will be described 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 pressing and bending a metal thin plate to bend the closing portion 31, the arm portions 32 and 32, the connecting portions 33 and 33, the attached portion 34, and the contact portion 36 as a plate 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. This is because if the angle is less than 10 °, the closing force of the closing portion 31 is small.

  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 to 6, the check valve 20 includes noise prevention means for preventing noise when the closing portion 31 of the valve plate 30 closes the outlet 23 a. The noise preventing means is composed of a seat step portion 26b formed at the opening peripheral edge portion of the outlet 23a of the passage forming member 22 and a contact portion 36 protruding in a rectangular shape below the valve plate 30. When the valve plate 30 is closed, the contact portion 36 hits the seat step portion 26b and curves together with the closing portion 31 to reduce the area where the outer peripheral portion of the closing portion 31 hits the seat surface 26a, and with the seat surface 26a. A slight gap is secured between them. The seat step portion 26b surrounds the lower half of the outer peripheral portion of the closing portion 31 so as to prevent the valve plate 30 from being unintentionally hooked and plastically deforming the valve plate 30 and preventing it from closing. As an effect.

(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, 32 around the connecting portions 33, 33, and forms a flow path between the outlet 23a, Fuel spills. And if the force of the fuel which pushes the closing part 31 falls below the force of the valve closing direction which has applied to the closing part 31, the closing part 31 will close.

(3) According to the check valve 20 according to the above embodiment, the following actions and effects can be obtained.
(3) -1 It is assumed that the fuel tank is filled with fuel up to the vicinity of the full tank and the fuel is accumulated in the passage forming member. In such a state, when the vehicle starts suddenly or travels on a step road, the fuel in the passage forming member 22 swings and pushes the valve plate 30 to open and close, as shown in FIG. The contact portion 36 integrally formed with 31 contacts the sheet step portion 26b. When the contact part 36 hits the sheet step part 26b, the area where the outer peripheral part of the closing part 31 excluding the contact part 36 collides with the opening peripheral part of the outlet 23a decreases, and the contact between the closing part 31 and the seat surface 26a. There is a slight gap between them. For this reason, due to the reduction of the collision area and the gap, the collision sound accompanying the opening and closing of the closing portion 31 is reduced, the resonance of the passage 22a of the passage forming member 22 is eliminated, and the noise that is harsh to the passenger can be eliminated. The check valve is mainly intended to prevent fuel blowback during refueling, and therefore does not require high sealing performance between the closing portion 31 and the seat surface 26a.

(3) -2 The structure for preventing the abnormal noise caused by the check valve 20 is the contact portion 36 formed on the outer peripheral portion of the closing portion 31 of the valve plate 30 and the seat step portion 26 b protruding from the passage forming member 22. Therefore, the number of parts does not increase and the configuration is simple.

(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 an exploded perspective view of a check valve 20B according to another embodiment. The present embodiment is characterized by a structure in which the sheet step portion 26Bb is formed on the sheet surface 26Ba of the passage forming member 22B and the contact portion 36B on the lower outer periphery of the closing portion 31B hits the sheet step portion 26Bb as noise preventing means. Have. That is, the sheet step 26Bb is formed at the lower inner periphery of the sheet surface 26Ba, and the sheet protection step 26Bc is formed at the outer peripheral half periphery. As described above, the sheet protection step portion 26Bc prevents plastic deformation of the valve plate 30B due to hooking, and is formed separately from the sheet step portion 26Bb, unlike the above-described embodiment. In this embodiment, in the closed state, the contact portion 36B at the lower outer periphery of the closing portion 31B hits the seat step portion 26Bb, so that the entire outer peripheral portion of the closing portion 31B avoids colliding with the seat surface 26Ba and is annoying. Sound is lost.

(4) -2 FIG. 11 is a sectional view showing a check valve 20C according to still another embodiment. The present embodiment is characterized by a configuration in which a contact portion 36C is bent at the lower end of the closing portion 31C of the valve plate 30C as an abnormal noise preventing means. That is, the contact portion 36C has a configuration in which a part of the lower outer periphery of the closing portion 31C is cut and raised so that the lower end leg portion 36Ca of the contact portion 36C hits the seat surface 26Ca. Further, the seat protection step portion 26Cc for preventing plastic deformation of the valve plate 30C is formed to be higher than the lower end of the closing portion 31C in the closed state so as to protect the contact portion 36C. In this embodiment, the leg portion 36Ca at the lower end of the contact portion 36C hits the seat surface 26Ca, and the entire outer peripheral portion of the closing portion 31C is avoided from colliding with the seat surface 26Ca, thereby eliminating annoying noise.

(4) -3 The closing part of the valve plate can take various shapes according to the shape of the fuel passage, and as described above, in addition to a circle or a fan shape obtained by dividing it, it 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 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 perspective view which shows the state which removed the valve plate from the channel | path formation member. It is sectional drawing which shows the vicinity of a valve plate. It is a top view which shows a valve plate. It is the figure seen from the arrow 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 the effect | action of a non-return valve. It is the perspective view which decomposed | disassembled the non-return valve concerning another Example. It is sectional drawing 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 20B ... Check valve 20C ... Check valve 22 ... Passage forming member 22B ... Passage forming member 22a ... Passage 23a ... Outlet 23b ... Inlet 25 ... Flange 26a ... Seat surface 26Ba ... Seat surface 26Ca ... Seat surface 26b ... Sheet step portion 26Bb ... Sheet step portion 26Bc ... Sheet protection step portion 26Cc ... Sheet protection step portion 27 ... Mounting portion 27a ... Side wall portion 27b ... Vertical wall 27c ... Presser portion 27d ... Bridge portion 28 ... Mounting groove 28a ... Insertion slot 28b ... Inclination Surface 28c ... engaging portion 30 ... valve plate 30B ... valve plate 30C ... valve plate 31 ... closing portion 31B ... closing portion 31C: Closing part 32 ... Arm part 33 ... Connecting part 34 ... Mounted part 34a ... Main body plate 34b ... Detaching part 34c ... Elastic piece 36 ... Contact part 36B ... Contact part 36C ... Contact part 36Ca ... Leg part 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), a seat surface (26a) formed on an opening peripheral edge of the outlet (23a), and the seat surface. A sheet step (26b) protruding from (26a),
The valve plate (30) includes a closing part (31) for opening and closing the outlet (23a), and a mounted part that is bent from the outer periphery of the closing part (31) and 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, a part of the outer peripheral portion of the closing portion (31) has a contact portion (36) that contacts the seat step portion (26b) in the closed state of the closing portion (31), and the contact portion (36 ) Is configured to reduce the contact area where the outer peripheral portion of the closing portion (31) hits the seat surface (26a). The check valve according to claim 1,
The closing part (31) is formed in a substantially disc shape,
The contact portion (36) is a check valve that protrudes on the opposite side of the attachment portion (27) with respect to the center of the closing portion (31). The check valve according to claim 1 or 2,
The contact portion (36) is a check valve that protrudes from the outer peripheral portion of the closing portion (31). In a check valve comprising a passage and a passage forming member having a flow outlet that flows out fluid from the passage, and a valve plate that is formed by cutting and bending an elastic thin plate to open and close the outlet.
The passage forming member includes an attachment portion for attaching the valve plate (30C), and a seat surface (26Ca) formed on the opening peripheral edge portion of the outlet.
The valve plate (30C) includes a closing portion (31C) that opens and closes the outlet, a mounted portion that is bent from an outer peripheral portion of the closing portion (31C) and is attached to the mounting portion, and the closing portion A contact portion (36C) bent from a part of the outer peripheral portion of (31C) to the outlet side,
When the closing part (31C) is pushed by the fluid, the outlet is opened by tilting with the attached part as a fulcrum, and the contact part is closed when the closing part (31C) is closed. The check valve is characterized in that the outer peripheral portion of the closing portion (31C) is formed so as to reduce the contact area of the seat surface (26Ca) when the portion (36C) contacts the seat surface (26Ca). .

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