JP2008106807A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow smooth passing of fluid during opening. <P>SOLUTION: A valve element 14 comprised of a pair of valve plates 24 is incorporated in a housing 6 composed of the check valve so as to open and close a fluid passage. Rotary shafts 15 are integrally formed on both valve plates 24, and the rotary shaft 15 is rotatably inserted such that it can be displaced in an axial direction of the housing 6 in an oval hole like bearing hole formed in a housing side. Pins 17 protrude from both valve plates 24, and they are inserted such that they can be displaced along a cam groove 18 formed on the housing 6. A ring like return spring 25 is incorporated on an inner side of a circumferential wall of the housing 6 to mount the rotary shaft 15. When a fluid pressure acts on the valve element 14, the rotary shaft 15 is displaced in the bearing hole while deflecting the return spring 25, and by moving the pin 17 along the cam groove 18, opening action of the valve element 14 is carried out. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a check valve incorporated in, for example, a fuel supply pipe to a fuel tank of an automobile.

In order to prevent the fuel vapor in the fuel tank of an automobile from being released into the atmosphere during refueling, or to prevent the backflow of fuel, there is known a fuel valve equipped with a check valve. As a check valve that can be used in such a place, the following Patent Document 1 is known.
JP 10-292874 A

  Each of the check valves has a valve body formed in a semicircular shape, and the fluid passage can be opened and closed by assembling the valve body around the hinge pin in the main body. Further, a return coil spring is wound around the hinge pin and urges the valve body in the closing direction.

  Thus, the check valve has a structure in which a hinge pin is arranged along the diameter direction of the main body, and a return coil spring is wound around the hinge pin. Therefore, the coil spring is naturally larger in diameter than the hinge pin. Since the coil spring having such a large diameter is arranged at the center of the fluid passage, the result is that the fluid passage area is reduced.

  This invention is completed based on the above situations, Comprising: It is providing the check valve which can let a fluid pass smoothly at the time of opening.

As means for achieving the above object, the invention according to claim 1 is incorporated in a fluid piping, and a housing in which the inside is formed as a fluid passage penetrating in the axial direction of the piping, and is attached to the housing. A check valve comprising: a valve body capable of opening and closing the fluid passage; and a biasing means for biasing the valve body in a closing direction,
The valve body includes a rotation shaft arranged so as to intersect the axial direction of the fluid passage, and is rotatable about the rotation shaft and moves along the axial direction of the fluid passage. A pair of semi-disc-shaped valve plates supported in a possible manner, and a pin disposed at a position spaced apart from the rotation shaft from the edge of each valve plate and projecting parallel to the rotation shaft. The biasing means is assembled to a wall constituting the fluid passage so as to be engageable with both end portions of the rotating shaft, and both the valve plates are disposed upstream of the fluid along the axial direction of the fluid passage in the fluid passage. The valve plates can be urged in the return direction when moving from the side to the downstream side, and the valve element moves on the wall constituting the fluid passage from the upstream side to the downstream side. As a result, the pins are guided to displace the valve bodies in the opening direction. Part has a feature where the is formed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the urging means is formed by a return spring having a substantially ring shape that is arranged along the circumferential direction of the peripheral wall constituting the fluid passage. In addition, the urging means is characterized in that the urging force is biased by locking the rotating shaft and deforming it downstream when a fluid pressure acts on the valve plate. .

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a part of each of the valve plates is integrally formed so as to share the rotating shaft with the end edges of the two valve plates that face each other. By being formed and combining both valve plates, both rotating shafts are formed so as to be positioned coaxially.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the pin is integrally formed so as to protrude outward in the diametrical direction from an end edge where the two valve plates abut each other. When the valve plates are combined, they are arranged at positions that are symmetric with respect to the rotation shaft, while the tips of the pins are displaced at positions corresponding to the pins on the wall surface that constitutes the fluid passage. The cam groove as the guide part for guiding the displacement operation of the both valve plates is formed symmetrically about the rotation shaft so that the valve body can be opened and closed. It is characterized by this.

<Invention of Claim 1>
According to the first aspect of the present invention, since the valve body holds the fluid passage in the closed state by the urging force of the urging means at the normal time when the fluid does not flow through the fluid passage in the housing, the reverse flow of the fluid is thereby caused. It is blocked. However, when both valve plates receive pressure from the fluid as the fluid passes, the pivot shafts of both valve plates move along the axial direction of the fluid passage against the biasing means. In conjunction with this operation, the two valve plates are operated so that the pin is guided by the guide portion to open the valve body. Thus, fluid can pass through the check valve and flow down the fluid passage.

  When the fluid flow stops and the fluid pressure no longer acts on the valve body, the rotating shaft returns to the original position by the urging force of the urging means. Then, the pin returns to the guide portion with the return operation, so that the valve body returns to the closed state again to prevent the back flow of the fluid.

  In particular, since the urging means is arranged at the end of the rotating shaft, it is effective for securing the passage area of the fluid.

<Invention of Claim 2>
According to the invention of claim 2, since the urging means is formed by the return spring having a substantially ring shape, the assembling work into the housing can be smoothly performed, and the urging means is provided on the peripheral surface of the fluid passage. Since it is the shape which follows, becoming resistance of a flow is relieved effectively.

<Invention of Claim 3>
According to the invention of claim 3, since the rotation shaft is formed integrally with the valve plate, the number of parts can be reduced.

<Invention of Claim 4>
According to the invention of claim 4, since the opening and closing operation of the valve plate is positively performed by the pin and the cam groove, the opening and closing operation of the valve plate can be stably performed.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, reference numeral 1 denotes a fuel tank of an automobile, and a lower pipe 2 projects from the upper part. On the other hand, an upper pipe 3 is attached so as to communicate with an oil filler port of the automobile body, and the upper and lower pipes 2 and 3 are connected by a rubber hose 4. The connecting portion between the hose 4 and the lower pipe 2 is firmly tightened by a metal hose clamp HC.

  A check valve 5 is incorporated in the projecting end portion from the fuel tank 1 inside the lower pipe 2. The check valve 5 includes a substantially cylindrical housing 6 (made of synthetic resin) that penetrates along the axial direction of the lower pipe 2. The housing 6 is formed in the lower pipe 2 so as to be fitted therein, and the inside thereof is a fluid passage 7. In addition, a flange edge 9 is formed so as to project along substantially the entire circumference excluding a retaining piece 8 described below on one opening edge (upstream side in the fuel flow direction) of the housing 6. The flange edge 9 is engaged with the projecting end edge of the lower pipe 2 from the outside to regulate the depth at which the housing 6 is fitted into the lower pipe 2. The protruding end edge of the lower pipe 2 swells in a ring shape along the entire circumference, and a mounting edge 10 is formed. Further, a pair of retaining pieces 8 described above are arranged symmetrically at a position near one opening edge of the housing 6 and slightly retracted from the flange edge 9. Both retaining pieces 8 can be bent inward and outward by cutting two slits 11 along the axial direction of the peripheral wall of the housing 6 to a predetermined depth. It can be locked. Thus, when the housing 6 is fitted from the upstream end of the lower pipe 2, the mounting edge 10 of the lower pipe 2 is locked while being sandwiched between the flange edge 9 and the retaining piece 8, and as a result, the housing 6 is fixed to the lower pipe 2. 2 is assembled so that it cannot move in the axial direction.

  As shown in FIG. 3, the opening edge of the other side of the housing 6 (on the downstream side in the fuel flow direction) is cut out so as to form a symmetrical shape by a pair of tapered surfaces 12. Has a horizontal portion 13. Both the tapered surfaces 12 are located at a position substantially perpendicular to the position where the retaining pieces 8 are provided. When both the corresponding valve plates 24 are in the closed state, they are in contact with the peripheral edge of the valve plate 24. Functions as a sealing surface.

  Between the portion of the housing 6 where the horizontal portion 13 is provided and the flange 9, the bearing hole 16 into which the shaft end of the rotating shaft 15 of the valve body 14 is inserted and the tip portion of the pin 17 of the valve body 14 are inserted. A pair of cam grooves 18 are formed so as to communicate with each other and sandwich the shaft center. Both bearing holes 16 have a long hole shape in the axial direction of the housing 6, and the cam groove 18 is formed to extend obliquely upward from the upstream end of the bearing hole 16. However, the extending directions of both cam grooves 18 are formed symmetrically with respect to the axis. Further, for smooth assembly of the valve body 14, along the axial direction from the upstream end edge of the housing 6 toward the location where the bearing hole 16 and the cam groove 18 are provided on the inner surface of the peripheral wall of the housing 6. Thus, the positioning groove 19 is formed in a recessed shape so that the rotating shaft 15 and the pin 17 can be assembled together in a positioned state.

  On the other hand, a pair of spring receiving portions 20A and 20B for the return spring 25 (biasing means) are arranged on the inner surface of the peripheral wall of the housing 6 on the downstream side of the both retaining pieces 8 described above, both radially inward. Protrudes toward. Further, both the spring receiving portions 20A and 20B are arranged at a position shifted by approximately 90 degrees in the circumferential direction from the location where the bearing hole 16 and the cam groove 18 are provided. One spring receiving portion (shown on the right side in FIG. 5, the first spring receiving portion 20A) protrudes in a rib shape from the downstream end edge of the housing 6 along the axial direction, and its upper end is a retaining piece 8. The receiving surface 21 forms a horizontal plane and extends directly below the base portion. Similarly, the other spring receiving portion (shown on the left side in FIG. 5, the second spring receiving portion 20B) protrudes in the shape of a rib while extending in the axial direction to just below the base of the retaining piece 8 and has a wide width at its upper end. A partition plate 22 is disposed at the center in the width direction. As shown in FIG. 4, the return spring 25 of the present embodiment is made of a metal wire and has a C shape slightly smaller than the inner diameter of the housing 6, as shown in FIG. This is because both ends of the return spring 25 are supported on both sides of the partition plate 22 in 20B. In addition, a plurality of guide ribs 23 (four in this embodiment: see FIG. 4) are formed on the inner surface of the peripheral wall of the housing 6 at equal angular intervals over the entire length of the housing 6. Each guide rib 23 has a projecting amount so that it can come into contact with the outer peripheral edge of the return spring 25 and also serves to correct the return spring 25 so as to maintain roundness. Thus, the return spring 25 is supported by the two spring receiving portions 20A and 20B, but the two spring receiving portions 20A and 20B are in a floating state with no support, and therefore the return spring 25 is in this floating region. Is allowed to bend.

  Next, the valve body 14 will be described. The valve body 14 is formed by two substantially semicircular valve plates 24 each having the same shape, and the valve body 14 can be assembled in a state in which they are reversed. (See FIGS. 9A and 9B). A bearing portion 26 is formed to protrude in the thickness direction of the valve plate 24 at one end of the base side edges (butting edges) of both the valve plates 24 and facing the upstream side of the fluid. . When the shaft holes 30 pass through both the bearing portions 26 and the both valve plates 24 are combined, the both bearing portions 26 are arranged at symmetrical positions, and the shaft holes 30 are coaxial with each other along the diameter direction of the valve body 14. It has come to make. A rotating shaft 15 is integrally formed along the same edge on the opposite side to the bearing portion 26 provided at the butt edge 24A of both valve plates 24. The pivot shaft 15 is provided so as to project forward from the butt edge 24A of the valve plate 24 in the plane direction and to have a step from the plate surface in the height direction, and when both the valve plates 24 are combined. They are coaxial with each other and are inserted into the shaft holes 30 of the corresponding bearing portions 26 in a rotatable state.

  When the valve body 14 is assembled in the housing 6, both the pivot shafts 15 are placed on the return spring 25 (upstream side of the fluid). At this time, the rotating shaft 15 is located at the upstream end of the bearing hole 16. Furthermore, as shown in FIG. 7, in both valve plates 24, the interval between the rotating shaft 15 and the bearing portion 26 (assembly space 27) is set wider than the entire length of each rotating shaft 15, When the plates 24 are combined, the pivot shaft 15 of the counterpart valve plate 24 is fitted in the assembly space 27 of the valve plate 24, and the two valve bodies 14 are moved in opposite directions along the butt edge 24A. The pivot shaft 15 can be passed through the shaft hole. In addition, a receiving groove 28 is formed along the entire circumference of the rotating shaft 15 at a portion protruding outward from the bearing portion 26, and can be engaged with the return spring 25.

  Further, in the range corresponding to the assembly space 27 at the butt edge 24A of both valve plates 24, a support wall 29 that receives the outer surface of the rotating shaft 15 of the counterpart valve plate 24 along the length direction is integrally formed. Is provided. The support wall 29 has a cylindrical shape that is divided into four so as to be adapted to the outer surface shape of the rotating shaft 15, and opens in the direction in which the counterpart rotating shaft 15 enters.

  Furthermore, a pin 17 projects in parallel with the rotation shaft 15 at the end of each bearing portion 26 on the opposite side to the valve plate 24. Both pins 17 are arranged on the upstream side of the fluid with respect to the rotating shaft 15, and when the valve body 14 is assembled to the housing 6, the pins 17 are inserted into the corresponding cam grooves 18 so as to be displaceable. When the valve element 14 closes the fluid passage 7, both pins 17 are positioned at the upstream end of the cam groove 18, and the valve plate 24 receives fluid pressure so that the rotating shaft 15 moves downstream in the bearing hole 16. With the movement to the side, the cam groove 18 moves toward the bearing hole 16 side. As the pin 17 moves along the cam groove 18, the valve plate 24 can be opened and closed as shown in FIGS.

  Next, the operation and effect of the present embodiment configured as described above will be described in detail. The check valve 5 closes the fluid passage 7 in the housing 6 in a state where no fuel is supplied. In other words, both rotating shafts 15 of the valve body 14 are placed on the peripheral edge of the return spring 25 and are held at the upstream end in the bearing hole 16, and at the same time, both pins 17 are also upstream of the corresponding cam groove 18. Located at the end. As a result, the two valve plates 24 are held at a mutually expanded angle (for example, 90 degrees) position as shown in FIG. As a result, the peripheral edges of the two valve plates 24 are in close contact with the peripheral edges of the two tapered surfaces 12 on the housing 6 side, and the space between them is sealed to prevent the fuel in the fuel tank 1 from flowing back. Yes.

  On the other hand, when fuel is supplied from the fuel filler port, fluid pressure accompanying the fueling acts on the plate surfaces of both valve plates 24. However, since both the valve plates 24 have their pins 17 inserted into the cam grooves 18 and their operations are restricted and cannot be immediately rotated, the rotating shaft 15 first passes through the bearing hole 16 on the downstream side. Displace to At the same time, the pin 17 is similarly displaced downstream in the cam groove 18 so that both valve plates 24 gradually rotate in a direction in which they approach each other. As a result, the valve body 14 opens the fluid passage, Thus, fuel can be supplied into the tank 1.

  When the rotating shaft 15 is displaced downstream in the bearing hole 16, the return spring 25 is bent downstream as shown in FIG. 3, so that the oil supply is stopped and the fluid pressure acts on the valve plate 24. When it disappears, the rotating shaft 15 moves backward toward the upstream side by the spring force of the return spring 25, and at the same time, the pin 17 also returns to the original position, so that the valve body 14 again closes the fluid passage.

  As described above, according to the present embodiment, the return spring 25 is disposed on the inner surface of the peripheral wall of the housing 6 and is not disposed on the diameter portion of the fluid passage as in the prior art. In addition to being arranged along the periphery, it contributes to a smooth flow of fuel.

  In this embodiment, since the return spring 25 has a substantially ring shape having a relatively large diameter along the peripheral wall in the housing 6, there is an advantage that the assembling work to the housing 6 can be easily performed. In addition, since a plurality of guide ribs are provided on the inner surface of the peripheral wall to guide the return spring 25, further smooth operation can be expected. Even if the return spring 25 is slightly deformed and its roundness is impaired, the shape can be corrected by these guide ribs.

  Further, since the rotary shafts 15 are integrally formed on both valve plates 24, the workability and the cost can be reduced by reducing the number of parts. Furthermore, since the valve body 14 is a combination of two valve plates 24 having the same shape, the mold cost can be reduced.

  Furthermore, since the opening / closing operation of the valve plate 24 is positively performed by the pin 17 and the cam groove 18, an effect that the opening / closing operation of the valve plate 24 can be stably performed is also obtained.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.

  (1) In this embodiment, the rotating shaft 15 is formed integrally with both valve bodies 14, but a rotating shaft 15 that is separate from the valve body 14 may be set. In that case, what is necessary is just to use the one rotating shaft 15 instead of the form which divides | segments between both valve plates 24 like this embodiment.

  (2) In the present embodiment, the return spring 25 has a C shape (ring shape with a cut), but may have a ring shape without a cut.

  (3) The return spring 25 is not necessarily in the form of a ring, and may be anything as long as it acts on the shaft end portion of the rotating shaft 15, for example, a coil spring arranged along the axial direction of the housing 6. It can also be considered.

(4) In this embodiment, the bearing hole 16 and the cam groove 18 are formed to communicate with each other, but these may be independent and non-communication.
(5) In this embodiment, the cam groove is used as the guide portion. However, the guide portion is not necessarily a groove, and may be configured to guide the pin between the pair of protrusions.

Sectional view showing check valve arrangement Cross section of check valve in closed state Cross section of check valve in open state Top view of check valve Sectional view showing components of check valve Cross section of housing Plan view showing the state of assembly between valve plates Plan view showing the state after assembly of the valve plates Sectional view showing assembly work between valve plates Side view showing check valve opening / closing operation Explanatory drawing of the operation of the valve body when opening and closing the valve body

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 ... Check valve 14 ... Valve body 15 ... Turning axis 16 ... Bearing hole 17 ... Pin 18 ... Cam groove 24 ... Valve plate 25 ... Return spring 26 ... Bearing part

Claims (4)

A housing that is incorporated in a fluid pipe and has a fluid passage that penetrates in the axial direction of the pipe, a valve body that is attached to the housing and that can open and close the fluid passage, and the valve body. A check valve comprising biasing means for biasing in the closing direction,
The valve body includes a rotation shaft arranged so as to intersect the axial direction of the fluid passage, and is rotatable about the rotation shaft and moves along the axial direction of the fluid passage. While having a pair of semi-disc-shaped valve plates supported in a possible manner, and a pin that is arranged at a position spaced from the rotating shaft from the edge of each valve plate and protrudes in parallel with the rotating shaft,
The biasing means is assembled to a wall constituting the fluid passage so as to be engageable with both end portions of the rotating shaft, and the both valve plates pass through the fluid passage along the axial direction of the fluid passage. When the valve plate moves from the upstream side to the downstream side, both the valve plates can be biased in the return direction,
In addition, a guide portion that guides the pin and displaces both valve bodies in the opening direction as the valve body moves from the upstream side to the downstream side in the fluid passage on the wall constituting the fluid passage. Is a check valve. The biasing means is formed by a return spring that is arranged along the circumferential direction of the peripheral wall constituting the fluid passage and has a substantially ring shape made of a wire,
2. The reverse of claim 1, wherein the biasing means latches the rotating shaft and deforms downstream when a fluid pressure acts on the valve plate, thereby biasing the biasing force. Stop valve. A part of each of the valve plates is integrally formed at the edge where the valve plates abut each other so as to share the rotation shaft, and both the valve plates are combined so that both the rotation shafts are coaxial. The check valve according to claim 1 or 2, wherein the check valve is formed to be positioned. The pin is integrally formed so as to protrude outward in the diametrical direction from an end edge portion where the two valve plates abut each other, and is symmetrical with respect to the rotating shaft when the two valve plates are combined. While being placed at the position
Displacement of the tip of both pins is inserted into a position corresponding to the two pins on the wall surface constituting the fluid passage so that the valve bodies can be opened and closed, and the displacement operation of the two valve plates is guided. The check valve according to any one of claims 1 to 3, wherein a cam groove as the guide portion is formed in a symmetric shape about the rotation axis.

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