JP3656691B2 - Check valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a backflow prevention valve for preventing backflow in a fuel system of a fuel tank of an automobile, for example.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a backflow prevention valve for preventing backflow in a fuel system of an automobile fuel tank, a valve described in Japanese Utility Model Laid-Open No. 5-90062 is known. This includes a case attached to the end of the flow path, a bearing provided at one upper edge of the case, a shaft that is pivotally supported by the bearing and extends to both sides, and the shaft And a single urging spring inserted respectively from both end sides of the shaft portion.
[0003]
[Problems to be solved by the invention]
The above-described backflow prevention valve is not sufficiently configured to support the shaft portion stably because the center portion of the shaft portion is pivotally supported by the bearing portion formed in one place. It is difficult to ensure the smooth operation of the body, and the biasing spring must be inserted from both sides of the shaft part by bending its central part, so it is difficult to insert and the assembly including mounting properties is difficult. There was a problem that there was a point to be improved in the sex.
[0004]
The present invention has been made paying attention to such problems of the prior art, and allows the backflow prevention valve to be inserted into a small-diameter pipe such as a tank intake pipe from the inlet side to rotate the valve body. Back flow prevention that can improve the support stability of the shaft portion by a pair of bearing portions that support the shaft portion that is the shaft, and can improve the assemblability including the mounting ability of the biasing means composed of a torsion coil spring. The purpose is to provide a valve.
[0005]
[Means for Solving the Problems]
The gist of the present invention for achieving this object resides in the matters described in the following sections.
[1] A cylindrical case (10) inserted into an intake pipe for supplying fluid into the tank (50);
A bearing portion (26) provided at the end of the cylindrical case (10) so as to protrude in the direction of fluid flow;
A shaft portion (31) pivotally supported by the bearing portion (26) is integrally formed, and is swingably mounted around the shaft portion, thereby closing one end of the case (10). A valve body (30) that prevents a reverse flow in the direction opposite to the outflow direction of the fluid and rotates when the fluid flows in from the intake pipe side to allow the forward flow;
A backflow prevention valve comprising biasing means (40) for biasing the valve body (30) in a closing direction;
The bearing portion (26) is formed in a pair of bearing portions (26) having a space between each other,
The shaft (31) is supported by the valve body (30) in a cantilever state extending to one side with a gap from the valve body (30),
The urging means (40) is constituted by a torsion coil spring that is inserted into the shaft portion (31) from the cantilevered side of the shaft portion (31) and located between the pair of bearing portions (26). ,
The valve body (30) integrally forms a support part (32),
The support portions (32) are provided in pairs at positions corresponding to one of the pair of bearing portions (26) so as to sandwich the one bearing portion (26) from both sides. valve.
[0006]
[2] The other bearing portion (26) of the pair of bearing portions (26, 26) has an opening stopper (27) that comes into contact with the valve body (30) when the valve body (30) is opened. The backflow prevention valve according to claim 1, wherein the backflow prevention valve is provided.
[0007]
Next, the operation of the invention described in each of the above items will be described.
In the check valve according to [1],
In the backflow prevention valve of the present invention, a pair of bearing portions (26) are protruded from the end portion of the case (10) in the direction of fluid flow through a space between them, and a biasing force comprising a torsion coil spring is provided in the space. Since the means (40) is arranged and the torsion coil spring is inserted into the cantilevered shaft portion (31), the pair of bearing portions (26) are provided in the tank (50) into which the case (10) is inserted. Since the inner diameter of the intake pipe is reduced, the backflow prevention valve can be inserted into a small diameter pipe such as an intake pipe or a hose. Further, by arranging the torsion coil spring in the space between the pair of bearing portions (26), the pair of bearing portions (26) can be arranged away from each other on both ends of the shaft portion (31). The pair of bearing portions (26) has sufficient support rigidity for supporting the shaft portion (31), the support stability of the shaft portion (31) is increased, and the valve element (30) operates smoothly. Can be secured.
[0008]
Further, one end of the shaft (31) is supported via the valve body (30) and the support part (32), and the torsion coil extends from the other end extending in a cantilevered state from one end of the shaft (31). A spring can be inserted through the shaft (31). After inserting the torsion coil spring into the shaft portion (31), if both ends of the shaft portion (31) are fitted into the pair of bearing portions (26), the torsion coil spring can be prevented from falling off. The assembling property including the mounting property of the spring can be improved.
The valve element (30) is urged in a direction to close one end of the case (10) by a sufficient urging force of the urging means (40) composed of a torsion coil spring, whereby the fluid flows backward to the hose side. Can be prevented.
[0009]
In the check valve described in [2],
Since the opening stopper (27) is provided on the other bearing portion (26) to keep it from opening further against the inflowing liquid when the inflow speed is high, the load applied to the valve body (30) is high. Sometimes, one bearing part (26) and the other bearing part (26) support the valve body (30), and the support rigidity and support strength of the valve body (30) can be increased.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view of a backflow prevention valve according to an embodiment. FIG. 2 is a cross-sectional view of a main part of the check valve according to the embodiment. FIG. 7 shows the intake pipe of the tank 50 into which the present check valve is inserted.
[0011]
As shown in FIGS. 1 and 2, the cylindrical case 10 as a whole, a support 20 sandwiched between the upper edge of the fluid outlet on the fluid outlet side (left side in FIG. 1) of the case 10, A valve body 30 that is swingably attached to the upper edge of the fluid outlet via a support 20 and closes the fluid outlet of the case 10 when it is swung to the inner closing position, and the valve body 30 is closed. And a torsion coil spring 40 biased to the side. The case 10 is made of metal, has an outer shape that is cylindrical, and is formed with an insertion portion 11 that can be inserted from the intake pipe port of the tank having a circular cross section. The rim of the fluid outlet is larger than the general outer diameter of the case 10. On the other hand, a flange portion 13 having a diameter larger than that of the insertion portion 11 is formed on the fluid inlet side (right side in FIG. 1) while being formed to have a small diameter taper. In addition, a seat 12 that extends in the horizontal direction is formed at the upper edge of the fluid outlet, and a locking hole 15 is formed in the center of the seat 12.
[0012]
FIG. 3 shows a plan view of the support 20 according to the embodiment. FIG. 4 shows a side view of the support 20 according to one embodiment.
As shown in FIGS. 1 to 4, a resin support 20 is attached to the seat 12 of the case 10. The support 20 has a clip portion 21, and the clip portion 21 is sandwiched between the seat portion 12 from the direction of the fluid outlet. The clip portion 21 is formed in a U-shaped cross section so as to sandwich the seat portion 12 from above and below, and has an upper clip 22 and a lower clip 23. The upper clip 22 is formed with an engaging projection 24 that engages with the locking hole 15 of the seat portion 12, and the lower clip 23 is provided with an engaging projection 24 and an insertion hole 25 for mold release. . The upper clip 22 and the lower clip 23 are formed with warped leading edges so as to be easily sandwiched.
[0013]
A pair of bearing portions 26 are integrally formed on both sides of the base end edge of the clip portion 21. A pair of bearing part 26 is formed in the ditch | groove cross-sectional shape opened upwards. An opening stopper 27 is formed on one bearing portion 26.
FIG. 5 is a front view of the valve body 30 according to the embodiment. FIG. 6 is a side view of the valve body 30 according to the embodiment.
[0014]
As shown in FIGS. 1, 2, 5, and 6, the valve body 30 is formed by integrally forming a shaft portion 31 that is rotatably fitted to the pair of bearing portions 26. The axis of the shaft portion 31 is positioned so as to be shifted from the fluid outlet in the fluid outflow direction, and is slightly lowered in the direction of the outlet central axis of the fluid outlet. Thereby, the shaft portion 31 is within the tube inner diameter of the intake tube and secures a predetermined length.
Further, a contacted surface portion 37 is formed on the valve body 30 so as to correspond to the opening degree stopper 27. The height of the surface of the contacted surface portion 37 is set so that the valve body 30 has a maximum opening angle (for example, 60 degrees) when the contacted surface portion 37 contacts the opening degree stopper 27.
[0015]
A shaft portion 31 is installed on the pair of bearing portions 26, and a torsion coil spring 40 that constitutes an urging means is wound around the installed portion of the shaft portion 31.
The torsion coil spring 40 is formed by bending a linear material having elasticity such as metal into a coil shape and extending both ends, one end of which is elastically applied to the surface of the valve body 30 and the other end to the clip portion 21. It is attached in contact.
[0016]
Next, the operation will be described.
The backflow prevention valve can be easily inserted into the intake pipe of the tank 50 from the outside when used in an automobile fuel tank 50 to which fuel is supplied by, for example, a filler hose (fuel supply hose). That is, if the insertion part 11 of the case 10 is inserted into the intake pipe port, the collar 13 is brought into close contact with the peripheral edge of the intake pipe port and fixed by welding or adhesion, the attachment state can be confirmed from the outside. Work can be completed.
[0017]
When the fuel is supplied, the valve body 30 is largely opened as shown in FIG. 2 to allow the forward flow, while the valve body 30 is closed by the biasing force of the torsion coil spring 40 except during the supply. When a pressure difference that causes backflow occurs, the valve body 30 is pressed against the lip of the fluid outlet of the case 10, so that the larger the differential pressure (backflow pressure), the higher the sealing performance and the case 10 is closed. , Backflow is completely prevented.
[0018]
In the backflow prevention valve of the present invention, the clip portion 21 of the support 20 is sandwiched between the mouth of the fluid outlet of the case 10, and the width of the clip portion 21 is the intake pipe of the tank 50 into which the case 10 is inserted. The pair of bearing portions 26 formed on both sides of the base end edge of the clip portion 21 are also accommodated within the tube inner diameter of the intake tube, and incorporate a backflow prevention valve. The pair of bearing portions 26 are not caught when inserted into the tube, and the backflow prevention valve can be easily inserted into the intake tube. In addition, the pair of bearing portions 26 formed on both sides of the base end edge of the clip portion 21 has sufficient support strength to support the shaft portion 31, and the clearance between both is wide, and the wide clearance The torsion coil spring 40 can be wound around the torsion coil spring 40, and the torsion coil spring 40 disposed in such a wide gap can exhibit a sufficient urging force.
[0019]
When the backflow prevention valve is inserted into the intake pipe of the tank 50, the case is formed so that the edge of the fluid outlet has a smaller diameter than the general outer diameter of the case 10.
In such a tapered case 10, the shaft portion 31 of the valve body 30 is disposed at a position shifted from the fluid outlet in the fluid outflow direction. Accordingly, if the shaft portion 31 is lowered from the shifted position toward the outlet central axis of the fluid outlet, the shaft portion 31 that is within the tube inner diameter of the intake pipe and has a sufficient length is obtained. The torsion coil spring 40 that exhibits a predetermined biasing force can be wound around the shaft portion 31 having such a sufficient length.
[0020]
The present invention is not limited to the above-described embodiment, and various modifications can be made.
FIG. 8 shows a partial front view of a valve body 30 according to another embodiment of the present invention, and FIG. 9 shows a partial side view of the valve body. FIG. 10 shows a partial front view of a valve body 30 according to still another embodiment, and FIG. 11 is a sectional view taken along line XI-XI in FIG.
[0021]
As shown in FIGS. 8 and 9, the valve body 30 may be formed with an opening degree stopper that protrudes laterally on the side wall of the left bearing portion 26 toward the paper surface of FIG. 8. Since the opening stopper abuts on the support portion 32 on the side where the shaft portion 31 is cantilevered, the twist of the shaft portion 31 is suppressed, and the valve body 30 can be reliably set to the specified maximum opening angle.
Further, as shown in FIGS. 10 and 11, an opening stopper that projects obliquely downward may be formed at the lower end portion of the left bearing portion 26 toward the paper surface of FIG. Thus, similarly, the twist of the shaft portion 31 is suppressed, and the valve body 30 can be reliably limited to the specified maximum opening angle.
[0022]
【The invention's effect】
In the backflow prevention valve of the present invention, the torsion coil spring is disposed in the space between the pair of bearing portions, so that the pair of bearing portions can be disposed away from each other on both ends of the shaft portion. Thus, the support stability of the shaft portion can be improved and the smooth operation of the valve body can be ensured. Further, one end portion of the shaft portion is supported by the valve body via a support portion, and a torsion coil spring is inserted into the shaft portion from the other end portion side extending from the one end portion of the shaft portion in a cantilevered state. After the shaft is inserted into the shaft, if both ends of the shaft are fitted into the pair of bearings, the torsion coil spring can be prevented from falling off, and the torsion coil spring can be easily assembled. Can be improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a backflow prevention valve according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of a backflow prevention valve according to an embodiment of the present invention.
FIG. 3 is a plan view of a support according to an embodiment of the present invention.
FIG. 4 shows a side view of a support according to an embodiment of the present invention.
FIG. 5 shows a front view of a valve body according to an embodiment of the present invention.
FIG. 6 shows a side view of a valve body according to an embodiment of the present invention.
FIG. 7 is a cross-sectional view of an intake pipe of a tank into which a backflow prevention valve according to an embodiment of the present invention is inserted.
FIG. 8 is a partial front view of a valve body according to another embodiment of the present invention.
FIG. 9 is a partial side view of a valve body according to another embodiment of the present invention.
FIG. 10 is a partial front view of a valve body according to still another embodiment of the present invention.
11 is a cross-sectional view taken along line XI-XI in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Case 11 ... Insertion part 12 ... Seat part 13 ... Collar-shaped part 20 ... Support body 21 ... Clip part 26 ... Bearing part 27 ... Opening stopper 30 ... Valve element 31 ... Shaft part 32 ... Supporting part 40 ... Torsion coil spring (Biasing means)
50 ... Tank

Claims (2)

A cylindrical case inserted into an intake pipe for supplying fluid into the tank;
A bearing portion provided at the end of the cylindrical case so as to protrude in the fluid outflow direction;
A shaft portion pivotally supported by the bearing portion is integrally formed, and is pivotably attached around the shaft portion. By closing one end of the case, the outflow direction of the fluid Is a valve element that prevents reverse flow in the reverse direction and rotates when fluid flows in from the intake pipe side to allow this forward flow,
A backflow prevention valve comprising biasing means for biasing the valve body in a closing direction;
The bearing portion is formed in a pair of bearing portions having a space between each other,
The shaft portion is supported by the valve body in a cantilever state extending to one side through a gap with the valve body,
The urging means is constituted by a torsion coil spring that is inserted between the pair of bearing portions through the shaft portion from the cantilevered side of the shaft portion,
The valve body integrally forms a support portion,
The backflow prevention valve according to claim 1, wherein a pair of the support portions are provided at a position corresponding to one of the pair of bearing portions so as to sandwich the one bearing portion from both sides.   2. The backflow prevention valve according to claim 1, wherein the other bearing portion of the pair of bearing portions has an opening degree stopper that contacts the valve body when the valve body is opened.

Images