JP5548836B1 - Check valve for fuel supply pipe - Google Patents

Abstract

An object of the present invention is to provide a check valve which has a small number of parts and can be easily assembled.
A body 321 attached along a pipe wall of an oil supply pipe 2, a flapper 323 that opens and closes a flow path of the oil supply pipe 2, and the body 321 and the flapper 323 are connected to each other, and the flapper 323 is connected to the oil supply pipe by its elasticity. This is solved by a check valve including a connecting portion 324 that presses the second flow path in the closing direction. The connecting portion 324 is surrounded by a slit 326 that is disposed on the peripheral wall 325 of the body 321 and penetrates the peripheral wall 325. One end is connected to the body 321 and the other end is connected to the flapper 323. The connecting portion 324 is elastically deformed with a connecting portion between the connecting portion 324 and the body 321 as a fulcrum 327. The body 321, the flapper 323, and the connecting portion 324 are integrally formed.

Description

The present invention relates to a check valve in a fuel supply pipe that prevents backflow of fuel.

When refueling an automobile, a refueling nozzle is inserted into the refueling port, and fuel is poured into the fuel tank through a refueling pipe communicating with the refueling port. Since the fuel is supplied vigorously from the fuel filler nozzle, when the liquid level in the fuel tank becomes high, the fuel may flow backward through the fuel filler pipe and overflow from the fuel filler port.

In order to prevent the backflow of fuel, a check valve is attached to the fuel supply pipe. For example, Patent Document 1 discloses a check valve including an insertion portion for a fuel supply pipe and a valve body. The valve element is pressed against the opening of the insertion portion by the torsion coil spring. When the fuel flows in from the proximal end of the insertion portion, the valve body pressed against the opening at the distal end is pushed open by the pressure of the fuel, allowing the fuel to pass. On the other hand, since the opening at the distal end of the insertion portion is blocked by the valve body, fuel does not flow into the insertion portion from the distal end side.

Patent Document 2 discloses a check valve including a body and a valve plate. The body is a cylindrical body and is fitted into the oil supply pipe. The valve plate is attached to the opening at the front end of the body, and opens and closes the opening at the front end of the body by elastic deformation of the arm as shown in FIG. When the fuel flows from the base end of the body, the fuel is pushed against the opening at the front end, and the arm is deformed to allow the passage of the fuel. On the other hand, since the valve body is supported by the support protrusion (reference numeral 38), it is difficult for the fuel to flow into the body from the front end side.

Japanese Patent No. 3656691 Japanese Patent No. 3152100

A conventional check valve generally has a configuration in which a flapper is pressed against an opening using a torsion coil spring as disclosed in Patent Document 1. The configuration using the torsion coil spring has a large number of parts and the assembly work is complicated. Although the check valve of Patent Document 2 is not configured to use a torsion coil spring, it requires at least two members, and the assembly work is also complicated.

An object of the present invention is to provide a check valve that has a small number of parts and is easy to assemble.

A body including a peripheral wall attached along the pipe wall of the oil supply pipe, a flapper that opens and closes the flow path of the oil supply pipe, and connects the body and the flapper and presses the flapper in a direction to close the flow path of the oil supply pipe by its elasticity. The above-described problem is solved by a check valve for a fuel supply pipe formed of a connecting portion. The connecting portion is disposed on the peripheral wall of the body and is surrounded by a slit penetrating the peripheral wall. One end of the connecting portion is connected to the body, and the other end of the connecting portion is connected to the flapper. The connecting portion is elastically deformed with a connecting portion with the body as a fulcrum. The body, the flapper, and the connecting portion are integrally formed.

In the present invention, the check valve is configured with a small number of members by integrally forming the body, the flapper, and the connecting portion. The connecting portion is formed by providing a slit that penetrates the peripheral wall of the body. That is, a slit is formed in the peripheral wall of the body, and a plate material constituting the peripheral wall of the body surrounded by the slit is used as the connecting portion. For this reason, it is not necessary to assemble an elastic member such as a torsion coil spring. And since a connection part is provided in the surrounding wall of a body, the shape of a connection part can be designed freely. For example, in order to increase the elasticity of the connecting portion, the length of the peripheral wall may be designed to be long, and the length of the connecting portion may be set to be long.

It is preferable that the shape of the connecting portion is a zigzag folded shape in which one or more foldings are continuous. By forming the zigzag folded shape, a long connecting portion can be formed on the body without lengthening the body. Thereby, the size and weight of the check valve can be reduced. Further, by adopting a zigzag folded shape and configuring the connecting portion to be long, it is possible to reduce the stress applied to the connecting portion and the connecting portion of the body, which are fulcrums for elastic deformation of the connecting portion. Thereby, fatigue of the fulcrum of the connecting portion can be reduced, and the flapper can be prevented from falling off due to the breaking of the connecting portion. Further, by configuring the connecting portion to be long, it is possible to increase the opening amount of the flapper with a small force. That is, since the flapper opens even with a small hydraulic pressure, the flow of fuel into the tank is not obstructed during refueling.

The check valve of the present invention may be attached to the outside of the end portion of the oil supply pipe, or may be fitted inside the oil supply pipe. In the former case, depending on the layout around the fuel supply pipe of the automobile, the connecting portion may come into contact with other members, and the movement of the connecting portion and the flapper may be hindered. Therefore, the check valve of the present invention is preferably configured to be fitted inside the oil supply pipe. That is, the body is a cylindrical member having a flat portion disposed on the outer side of the peripheral wall and openings disposed on both ends of the body, and the member is fitted inside the oil supply pipe. The connecting portion has one end connected to the body and the other end connected to the flapper. The connecting portion presses the flapper in the direction of closing the opening at one end of the body due to its elasticity. The flapper is a member that opens and closes an opening at one end of the body, and is pressed in a direction to close the opening at one end of the body by the elasticity of the connecting portion. And a connection part is distribute | arranged to the flat part of the surrounding wall of a body. If comprised in this way, since a space is formed between the inner side of an oil supply pipe and a flat part, a connection part can be elastically deformed in this space. Since the connection portion is isolated from the outside by the oil supply pipe, the connection portion does not interfere with other members and the movement is not hindered.

It is preferable to provide a rib around the connecting portion provided in the flat portion. If a slit is provided in the body, the fuel may flow into the check valve through the slit and the fuel may flow backward. Therefore, the reverse flow of the fuel can be effectively prevented by providing the rib so as to surround the slit. Furthermore, the rigidity of the check valve can be improved by providing the rib. If the end of the rib is in contact with the inside of the oil supply pipe, the check valve can be firmly fixed to the oil supply pipe.

The check valve of the present invention is formed by integrally forming a body, a flapper, and a connecting portion. Since the connecting portion is formed by a slit that penetrates the peripheral wall of the body, it is easy to mold. In addition, since it is not necessary to assemble an elastic member such as a torsion coil spring, manufacturing is easy and the torsion coil spring does not fall off.

It is a fragmentary sectional view which shows the mounting position of the non-return valve of this invention. It is a perspective view which shows an example of the non-return valve of this invention. FIG. 3 is a plan view of the check valve of FIG. 2. It is sectional drawing of the AA part of FIG. FIG. 3 is a right side view of the check valve of FIG. 2. It is a fragmentary sectional view which shows the state which fitted the non-return valve of FIG. 2 in the 2nd pipe. It is sectional drawing of the BB part of FIG. It is a perspective view which shows an example of the non-return valve of this invention. It is a perspective view which shows the state which assembled | attached the non-return valve of FIG. 8 to the oil supply pipe | tube.

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.

FIG. 1 shows a general fuel tank 1 (hereinafter simply referred to as a tank) and a fuel oil supply pipe 2 (hereinafter simply referred to as a fuel supply pipe). The oil supply pipe 2 includes a first pipe 21 located on the oil supply port side, a second pipe 22 located on the tank side, and a flexible hose 23 that connects the first pipe 21 and the second pipe 22. The check valve of the present invention, as schematically shown by a hatched rectangular member in FIG. 1, is the inner side of the tip of the first pipe 21, the outer side or the inner side of the tip of the second pipe 22, or the second It is used by being fitted inside the proximal end of the pipe 22. In FIG. 1, check valves 31, 32, 33 and 34 are shown in order from the fuel filler side. Hereinafter, a check valve 32 that is used by being fitted inside the proximal end of the second pipe 22 and a check valve 34 that is used by being attached to the outside of the distal end of the second pipe 22 will be described as examples. The bodies 331 and 431 are members attached so as to be in contact with the tube wall of the second pipe 22, and include peripheral walls that are in contact with the tube wall of the oil supply tube. The peripheral wall of the body is a wall surface around the pipe wall of the oil supply pipe, and includes both the case where it contacts the inside of the oil supply pipe and the case where it contacts the outside of the oil supply pipe. The flapper 323 is a plate-like lid that opens and closes the flow path of the oil supply pipe.

[Check valve 32]
As shown in FIG. 2, the check valve 32 fitted inside the proximal end of the second pipe 22 includes a cylindrical body 321 having openings at both ends, and a flapper 323 that opens and closes the opening 322 at the distal end of the body 321. And a connecting portion 324 that connects the body 321 and the flapper 323. The connecting portion 324 is surrounded by two slits 326 that penetrate the peripheral wall 325 of the body 321. That is, the connecting portion 324 is a plate material of the body 321 surrounded by the two slits 326. The two slits 326 communicate with the opening 322.

As shown in FIG. 6, the check valve 32 of this embodiment is fitted into the base end of the second pipe 22. As shown in the cross-sectional view of FIG. 4, the check valve 32 includes openings 322 and 329 at both the distal end and the proximal end. As schematically shown in FIG. 6, the fuel flows into the body 321 from the opening 329 on the proximal end side of the second pipe 22 and pushes the flapper 323 on the distal end side by the elasticity of the connecting portion 324. When the inflow of fuel stops, the flapper 323 is pressed against the opening 322 by the elasticity of the connecting portion 324. The opening 322 is closed by the flapper 323 when no stress is applied to the connecting portion 324. When the fuel flows in from the front end side of the second pipe 22, the front end of the flapper 323 comes into contact with the front end of the body 321 so that the flapper 323 does not open. . That is, the flapper 323 opens and closes the fuel flow path of the second pipe.

The connecting portion 324 is distorted when stress is applied to the connecting portion, but a shape that returns to the original shape when the stress is removed can be employed. For example, a square, a strip shape, and a zigzag folded shape are mentioned. Since the connecting portion 324 elastically deforms with the connecting portion of the connecting portion 324 and the body 321 as a fulcrum 327 (see FIG. 3), the connecting portion 324 often breaks from the fulcrum 327 when the connecting portion 324 is broken. For this reason, it is preferable to set the length of the connecting portion 324 to be long and reduce the fatigue of the fulcrum 327. In this case, when the connecting portion 324 has a zigzag shape, the long connecting portion 324 can be formed on the body 321 without lengthening the body 321. By configuring the connecting portion 324 to be long, the deformation amount of the connecting portion 324 can be increased with a small force. That is, since the flapper 323 can be opened even with a small hydraulic pressure, the inflow of fuel during refueling is not hindered. Further, if the zigzag shape is used, the stress is distributed to the curved portion 328, so that the fatigue of the fulcrum 327 can be reduced. When using a zigzag fold, fold it one or more times. The number of times of folding is determined by the material of the connecting portion 324 and the required elasticity. In the connection part 324 of the present embodiment, it is folded back in a direction orthogonal to the insertion direction of the check valve 32, but the direction of the folding is not particularly limited, and may be folded back in parallel with the insertion direction.

The check valve 32 of this embodiment includes a flange 330. As shown in FIG. 6, the flange 330 abuts the proximal end of the second pipe 22 to fix the check valve 32 to the proximal end. The check valve 32 includes a flat portion 331 on the peripheral wall 325 of the body 321. As shown in FIG. 7, since the flat portion 331 is provided, the cross-sectional shape orthogonal to the insertion direction of the body 321 is a circle obtained by cutting out about the upper third. When the body 321 is fitted into the second pipe 22, the peripheral wall 325 of the body 321 contacts the inner wall of the second pipe 22 except for the flat portion 331. That is, a space G is formed between the body 321 and the inner wall of the second pipe 22 at the location of the flat portion 331. As shown in FIG. 6, the flapper 323 is displaced up and down using the space. Since the connecting portion 324 connected to the flapper 323 is elastically deformed inside the second pipe 22, the connecting portion 324 comes into contact with other members and the movement thereof is not hindered.

The check valve 32 according to the present embodiment includes a rib 332 around the connecting portion 324 provided in the flat portion 331. The rib 332 functions as a wall that prevents the fuel that flows backward from the slit 326 from flowing into the check valve 32, and prevents the fuel from flowing backward. That is, the shape of the body 321 is such that the peripheral wall 325 and the rib 332 are in contact with the inner wall of the second pipe 22 without a gap, except for the gate 333 (see FIG. 2). The rib 332 also functions as a reinforcing material that compensates for the decrease in rigidity caused by providing the slit 326 in the peripheral wall 325 of the body 22. The upper end of the rib 332 abuts against the inner wall of the second pipe 22 and fixes the check valve 32 to the second pipe 22. The rib 332 includes a gate 333 (see FIG. 2), and the connecting portion 324 passes between the gates 333. The connecting part 324 moves up and down between the gates 333, and the gates 333 prevent lateral shaking.

As shown in FIG. 5, the check valve 32 of the present embodiment has its tip cut obliquely, and the end surface of the opening 322 is also slanted. In accordance with this, the flapper 323 is also arranged obliquely. By arranging the flapper 323 obliquely, the area where the fuel comes into contact is increased, and the flapper 323 is opened immediately upon the inflow of fuel.

[Check valve 34]
As described above, the check valve 34 is configured to be fitted outside the tip of the second pipe 23. As shown in FIGS. 8 and 9, the check valve 34 includes a flapper 323, a connecting portion 324, and a body 431, similarly to the check valve 32. The function of these members is not different from the check valve 32. However, the peripheral wall 432 of the body 431 does not cover the entire pipe wall of the second pipe, but is configured as a plate material that covers a part of the pipe wall. Thereby, the weight of the check valve 34 is reduced. The same is true for forming the connecting portion 324 by providing the slit 326 in the plate material. The plate thickness of the peripheral wall 432 is set according to the elasticity required for the connecting portion 324. The body 431 may be configured to cover the entire tube wall of the second pipe 23 similarly to the check valve 32 and may be configured to be fitted to the outside of the tip of the second pipe. The body 431 shown in FIGS. 8 and 9 has a shape extending downward from the rib 332, and has a claw that engages with a hole provided in the oil supply pipe at the lower end of the body 431.

In FIG. 8, the shape of the 2nd pipe 23 is a shape which cut off upper 1/3. If the shape of the second pipe is a perfect circle, the flat portion 331 of the body 431 may be curved along the shape of the second pipe.

As described above, the check valve 32 is fitted inside the proximal end of the second pipe 22, and the check valve 34 is fitted outside the distal end of the second pipe 22. When the tank 1 is formed of a metal material, it is preferable to arrange the check valve 32 at the position indicated by reference numeral 32. When the tank 1 is made of a metal material, the check valve 32 may be deformed by heat (for example, 20 to 30 minutes at 120 to 180 ° C.) due to the coating of the anticorrosive paint in powder coating. Because. When the tank 1 is formed of a resin material, a check valve 34 may be disposed at a position 34.

On the other hand, in order to mount the check valve of the present invention at the position 31 or 33 in FIG. 1, a hole is provided in the oil supply pipe 2 and a claw that engages with the hole is provided in the body 321.

In the check valve of the present invention, the body 321, the flapper 323, and the connecting portion 324 are integrally formed. Therefore, it can be easily mass-produced by injection molding. The check valve is made of a material having oil resistance, strength, and moldability. For example, a synthetic resin such as polyacetal, high-density polyethylene, or nylon can be used.

DESCRIPTION OF SYMBOLS 1 Fuel tank 2 Fuel supply pipe 21 1st pipe 22 2nd pipe 23 Flexible hose 31 Check valve 32 Check valve 321 Body 322 Opening 323 Flapper 324 Connection part 325 Peripheral wall 326 Slit 327 Supporting point 328 Curved part 329 Opening 330 Flange 331 Flat Portion 332 Rib 333 Gate 33 Check valve 34 Check valve 430 Flange 431 Body 432 Perimeter wall

Claims (4)

A body including a peripheral wall attached along the pipe wall of the oil supply pipe;
A flapper that opens and closes the flow path of the oil supply pipe;
It consists of a connecting part that connects the body and the flapper and presses the flapper in the direction to close the flow path of the oil supply pipe by its elasticity,
The connecting portion is disposed on the peripheral wall of the body and is surrounded by a slit penetrating the peripheral wall, one end of which is connected to the body and the other end is connected to the flapper, and the connecting portion between the connecting portion and the body is A member that elastically deforms as a fulcrum,
A check valve for a fuel supply pipe, wherein the body, the flapper, and the connecting portion are integrally formed. 2. The check valve for a fuel supply pipe according to claim 1, wherein a shape of the connecting portion is a zigzag folded shape in which one or more turns are continued. The body is a cylindrical member having a flat part arranged on the outer side of the peripheral wall and openings arranged on both ends thereof, and is fitted inside the oil supply pipe.
The connecting portion is a member that has one end connected to the body and the other end connected to the flapper, and presses the flapper in the direction of closing the opening of one end of the body by its elasticity,
The flapper is a member that opens and closes the opening at one end of the body and is pressed in the direction to close the opening by the elasticity of the connecting portion,
3. The check valve for a fuel supply pipe according to claim 1, wherein the connecting part is arranged in the flat part and elastically deforms in a space defined by the inside and the flat part of the fuel supply pipe. The check valve for a fuel supply pipe according to claim 3, wherein a rib is provided around a connecting portion provided in the flat part, and a peripheral wall of the body and an end of the rib are brought into contact with the inside of the supply pipe.

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