JP2579846Y2 - Check valve - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve for preventing backflow in a fuel supply system of a fuel tank of an automobile, for example.

[0002]

2. Description of the Related Art Conventionally, a check valve for preventing a backflow in a fuel supply system of a fuel tank of an automobile has been disclosed in Japanese Utility Model Application Laid-Open No.
What is described in -191628 is known. This is inserted and mounted in a short pipe formed in the tank body to connect a filler hose (supply hose), and comprises a cylindrical valve housing and a valve body seated at one end of the valve housing. .

As shown in FIG. 3 of the above-mentioned publication, the check valve has an outer shape which fits entirely in the short pipe and can be attached from the outside of the tank (external type).
As shown in FIG. 7 of the above-mentioned publication, there is a type in which the end provided with the valve body 8 has a large diameter and can be attached only from the inside of the tank (inner type).

[0004]

The above-mentioned check valve is intended to prevent a problem such as that fuel is blown out by internal pressure when a fuel filler is opened, but is provided separately from a short pipe of a tank. Although it is a configuration that is installed inside this short pipe, it is necessary to form a short pipe for connecting the filler hose in the tank, and it is also essential to ensure the inner diameter accuracy of this short pipe. However, there is a problem that the cost of the connection portion of the filler hose is increased.

[0005] That is, in recent years, fuel tanks for automobiles are manufactured by blow molding using synthetic resin as a material. However, if there is the short pipe required to have a certain length to connect a filler hose, this blow molding is required. The shape of the mold for the mold becomes complicated, and the cost of the mold increases. In addition, blow molding generally has poor inner diameter accuracy, and in some cases, the inner diameter of the short pipe needs to be finished by cutting in order to mount a check valve, and this processing cost is also required.

In addition, since the valve is mounted inside the short pipe, the flow path area is reduced by at least the thickness of the valve housing. (Especially, in the case of the internal type, the opening where the valve element is seated is narrow and the flow path is narrowed. ), There is a problem that the resistance increases and the fuel supply property deteriorates. In addition, the inner type needs to be inserted through an opening (a cap mounting portion or the like provided on the upper surface) different from the connection portion of the filler hose and mounted by groping, and it is difficult to confirm the mounting state. Therefore, there is a problem in that the workability of the attachment is poor, and the probability of occurrence of a work failure such as forgetting to attach the valve body is increased.

The present invention has been made in view of the above-mentioned problems of the prior art. The production of a tank is easy and inexpensive, and a large flow passage area can be secured.
The object of the present invention is to provide a check valve that is excellent in case assembling workability, reduces assembling cost, is excellent in rigidity of a case supporting portion, and can improve operation stability and sealing performance of a valve body. I have.

[0008]

SUMMARY OF THE INVENTION To achieve the above object, the gist of the present invention is as follows. (1) In a synthetic resin tank (60) supplied with fluid from a hose (50), the tank (60) A) a check valve for preventing backflow of fluid from the inside to the hose (50) side, comprising a cylindrical case (10) and a valve body (20), wherein the case (10) is inserted Department (1
1), connection part (12), brim-shaped part (13), shaft support part (1
6) and the valve seat is integrally formed of a synthetic resin material,
The insertion portion (11) is provided at one end of the case (10) through an opening (61) in a wall surface of the tank (60).
The connection part (12) is formed so as to be freely inserted into the inside.
Is formed so that a hose (50) can be connected to the other end of the case (10), and the brim-shaped portion (13) is connected to an insertion portion (11) on the outer periphery of the case (10). The tank (60) formed between (12);
The valve body (20) is swingably attached to one end of the case (10), and is closed by closing one end of the case (10). It prevents backflow and opens only when fluid flows in from the hose (50) side to allow this forward flow, and the insertion portion (11) and the opening (61) on the wall surface of the tank (60) A check valve characterized in that it is configured to be fitted and positioned with each other. (2) The shaft support (16) is provided at a distal end of the insertion portion (11) of the case (10) so as to protrude from a distal end of the insertion portion (11) in a forward direction of the flow. The check valve according to the paragraph. 3. A spring (40) for urging the valve body (20) in a direction to close the valve body is wound around a swinging central axis of the valve body (20), and one end of the spring (40) is connected to the valve by the valve. Body (20)
The other end of the spring (40) is elastically supported by a recess formed around the outer diameter of the insertion portion (11) of the case (10). 2. The check valve according to claim 1, wherein the check valve is supported in a contact state. (4) The collar portion (13) has an annular groove (14), and the annular groove (14) is close to the outer periphery of the insertion portion (11) and the outer periphery of the insertion portion. Wherein the check valve is provided so as to surround the check valve.

[0009]

According to the check valve of the present invention, only the opening (61) corresponding to the insertion portion (11) of the case (10) is formed at the connecting position of the hose (50) on the wall of the tank (60). (60) can be easily attached from outside. That is, the insertion portion (11) of the case (10) is
1), and the collar (13) is inserted into this opening (61).
(61) If it is brought into close contact with the peripheral edge and fixed by welding or the like, the mounting operation can be completed while checking the mounting state from the outside.

In addition, the hose (50) is connected to the connection (12) formed at the other end of the case (10) of the present check valve, so that a short pipe is not formed in the tank (60). Can be connected to the tank (60) via the check valve, and the inner diameter of the check valve (minimum inner diameter of the injection portion) is set to the hose (5).
If the size (inner diameter) of 0) is constant, the conventional tank (6)
It can be enlarged to the same size as the inner diameter of the short tube formed in 0). In addition, a synthetic resin case (1
The opening (61) of the synthetic resin tank (60) into which the insertion portion (11) of (0) is inserted can be a single hole close to the outer circumference of the insertion portion (11). (60)
And the insertion part (11) can be inserted using the opening (61) of the tank (60) as a guide, so that the assembling workability is good, and the insertion part (11) and the tank (6) can be easily inserted.
0) The case (10) can be positioned by fitting the opening (61) in the wall surface with each other, so that a special assembling tool is not required, and the assembling cost can be reduced. As a result, the assembling workability can be further improved. Further, since the synthetic resin case (10) is directly and integrally supported on the synthetic resin tank (60) by welding or bonding, compared with the case where bolts, nuts and other supporting means are used, The support rigidity of the portion to be welded or bonded can be easily increased. Furthermore, the insertion part (1) of the case (10)
1) Not only the connecting part (12) and the brim-shaped part (13), but also the bearing part (16) and the valve seat are the tank (6).
0) and the valve body (2)
The opening and closing operation of 0) is stabilized, and the sealing performance between the valve body (20) and the valve seat can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the check valve of this embodiment includes a cylindrical case 10 as a whole,
The valve body 20 is swingably attached to the distal end side (left side in FIG. 1) of the case 10 and closes the distal end opening of the case 10 when it swings to the closed position inside. And a spring 40 that urges the valve body 20 to the closing side.

The case 10 has, at the distal end side, an insertion portion 11 whose outer shape is cylindrical and can be inserted through a circular opening, and a hose can be fitted and connected to the proximal end side (right side in FIG. 1). A connecting portion 12 is formed, and a brim-like portion 13 having a larger diameter than the inserting portion 11 is formed between the inserting portion 11 and the connecting portion 12 on the outer periphery. It can be manufactured at low cost by injection molding.

An annular concave portion 14 (so-called relief) is formed on the inner peripheral side of the front end side surface of the brim-shaped portion 13 of the case 10, whereby the outer peripheral portion 15 on the side surface is relatively extended. The outer peripheral portion 15 is a flat surface having an appropriate surface roughness so as to be in close contact with the periphery (flat surface) of the opening into which the insertion portion 11 is inserted.

On both sides of the upper end of the case 10 on the side of the insertion portion 11, as shown in FIG. 2, shaft supports 16, 16 for supporting the shaft 30 are formed. Is hose connectivity (sealability, reliability against disconnection)
Is formed to increase the diameter.

The valve body 20 is formed by forming two shaft supports 21 and 21 on the upper surface of a disk-shaped main body at intervals outside the shaft supports 16 and 16 of the case 10. . The valve element 10 is provided on the shaft support 1 of the case 10.
The shaft 30 is attached through the shaft supports 21, 21 of the valve body 10 so as to be rotatable around the shaft 30, and close to the distal end surface of the insertion portion 11 in the case 10. Swingable to open from the position. The valve body 40 can also be manufactured at low cost by, for example, injection molding using synthetic resin as a material.

The spring 40 is formed by bending a linear material having elasticity such as metal into a coil shape and extending both ends thereof. The coil portion is wound around the shaft 30 between the shaft support portions 16, and has one end. Is attached to the surface of the valve body 20 with the other end elastically in contact with the upper surface of the insertion portion 11 of the case 10. The insertion portion 11 with which the spring 40 elastically contacts.
Has a slightly concave shape so that the spring 40 does not interfere with the insertion of the insertion portion 11 into the opening.

Next, the operation will be described. For example, when the check valve is used for an automobile fuel tank 60 to which fuel is supplied by a filler hose 50, an opening 61 corresponding to the insertion portion 11 of the case 10 is formed as shown in FIG.
It can be easily attached to the tank 60 from the outside only by forming it at the filler hose connection position on the wall surface in. That is, the insertion portion 11 of the case 10 is
1 and the outer peripheral portion 15 of the side face of the brim portion 13 is brought into close contact with the peripheral edge of the opening 11 and fixed by welding or bonding, etc., so that the mounting operation can be completed while checking the mounting state from the outside. .

When fuel is supplied, the valve body 20
4, the valve body 20 is closed by the urging force of the spring 40 except when the valve is being supplied, and when a pressure difference causing a reverse flow occurs, the valve body 20 is closed when the supply is not being performed. Due to the planar contact between the front end surface of the case 10 and the inner surface of the valve body 20 which is further pressed against the front end surface by this pressure, the larger the differential pressure (backflow pressure), the higher the sealing property and the case 10 is closed, and the backflow is completely eliminated Is prevented.

Further, with the above-described check valve, the filler hose 50 is connected to the connecting portion 12 formed on the base end side of the case 10.
To the fuel tank 60 through this check valve.
If the size (inner diameter) of the filler hose 50 is constant, the inner diameter of the case 10 (the minimum inner diameter of the injection portion) is substantially the same as the inner diameter of the above-described short pipe conventionally formed in the fuel tank. Therefore, the resistance at the time of fuel injection can be reduced.

That is, as shown in FIG. 3, the check valve case 10 functions as a conventional short pipe (in other words, a valve body is directly attached to the tip of the conventional short pipe). As compared with the conventional configuration in which the check valve housing is further provided inside the short pipe inside the filler hose, the flow path area is increased by at least the thickness of the housing.

Therefore, the above-mentioned check valve functions as a connection portion of the filler hose 50 while maintaining the function of the check valve sufficiently, and serves to connect the filler hose 50 to the fuel tank 60. There is no need to form a short pipe, and the manufacturing cost of the fuel tank can be reduced. In addition, various effects can be obtained such that the fuel supply can be smoothly performed by enlarging the flow path area, and the work of installing the check valve is facilitated and the reliability of the work is improved.

It should be noted that the present invention is not limited to the above-described embodiment, and may have various modifications. For example, the sealing configuration of the peripheral edge of the opening into which the insertion portion of the case is inserted is not limited to the above-described welding and bonding. Also, even when welding or bonding is performed, an annular protrusion is formed on one of the joining surface of the brim-shaped portion and the peripheral edge of the opening of the tank, and an annular groove is formed on the other to fit the annular protrusion. For example, the reliability of the seal may be improved.

Further, in the case of the above embodiment, the positioning of the check valve is performed only by fitting the opening into the insertion portion of the case.

[0024]

[Effects of the Invention] With the check valve of the present invention, a short pipe for connecting the hose to the tank is formed, while maintaining the function of the check valve sufficiently and also functioning as a hose connection part. This eliminates the need to perform the process, and can reduce the manufacturing cost of the fuel tank. In addition, various effects can be obtained such that the flow area can be increased at least by the amount corresponding to the elimination of the conventional short pipe, fuel can be supplied smoothly, and the check valve installation work becomes easy and the work reliability is improved. Are simultaneously obtained. Further, the opening of the synthetic resin tank can be a single hole close to the outer circumference of the insertion portion of the synthetic resin case, so that the processing of the tank becomes easy and the insertion portion closes the opening of the tank. As it can be inserted as a guide, assembly workability is good and the case can be positioned by fitting the insertion part and the opening of the tank wall,
A special assembling tool becomes unnecessary, the assembling cost can be reduced, and the assembling workability can be further improved. Furthermore, since the synthetic resin case is directly supported by welding and bonding in the synthetic resin tank, the rigidity of the support portion is easier than when bolts, nuts and other supporting means are used. Can be higher. further,
Since even the shaft support and the valve seat are integrally supported with the tank with high rigidity, the opening and closing operation of the valve body is stabilized, and the sealing performance between the valve body and the valve seat can be enhanced.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a side sectional view showing a usage example of the embodiment of the present invention;

FIG. 4 is a side sectional view showing the operation of the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Case 11 ... Insertion part 12 ... Connection part 13 ... Flange part 20 ... Valve body

Claims (4)

(57) [Scope of request for utility model registration] 1. A check valve for preventing backflow of a fluid from the inside of a tank to a hose side in a synthetic resin tank to which a fluid is supplied from a hose, comprising a cylindrical case and a valve body. In the above, the case is configured such that an insertion portion, a connection portion, a flange portion, a shaft support portion, and a valve seat are integrally formed of a synthetic resin material, and the insertion portion has an opening of a tank wall surface at one end side of the case. The connection portion is formed so as to be freely inserted into the tank, the connection portion is formed so that a hose can be connected to the other end of the case, and the collar portion is connected to an insertion portion on the outer periphery of the case. The valve body is fixed to the wall surface of the tank by welding or bonding, and the valve body is swingably attached to one end of the case, and closes one end of the case. Prevents the backflow It opens only when a fluid flows in from the hose side to allow this forward flow, and the insertion portion and the opening in the tank wall are configured to be fitted and positioned with each other. Check valve. 2. The check valve according to claim 1, wherein the shaft supporting portion is provided at a distal end of the insertion portion of the case and protrudes from the distal end of the insertion portion in a forward direction of the flow. . 3. A spring for urging the valve body in a direction to close the valve body is wound around a pivot center axis of the valve body, and one end of the spring elastically contacts the surface of the valve body. The other end of the spring is supported in a state of being elastically in contact with a recess formed on an outer circumference of an insertion portion of the case. 2. The check valve according to claim 1. 4. The collar-shaped portion has an annular concave groove, the annular concave groove is close to the outer periphery of the insertion portion, and
The check valve according to claim 1, wherein the check valve is provided so as to surround an outer periphery of the insertion portion.