KR20100130950A - Check valve - Google Patents

Abstract

PURPOSE: A check valve is provided to improve sealability of the valve by using a sealing member and to prevent a valve body from horizontally shaking. CONSTITUTION: A check valve comprises a housing, a valve body(3), elastic units(5), a ring-shaped elastic sealing member. A flow passage is formed in the housing. The valve body is formed inside the housing and is moved along a flowing direction of liquid. The elastic units elastically support the valve body in a closing direction of the valve and have flow passage openings(41). When the valve is closed, the valve body is inserted into the flow passage openings.

Description

Backflow Check Valve {CHECK VALVE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-return valve for preventing a back flow of a fluid, and more particularly to a non-return valve suitable for preventing a back flow of fuel in a fuel supply path of a fuel tank.

Conventionally, the fuel supply path of a fuel tank in an automobile or the like opens a valve by the pressure of the fuel at the time of refueling, thereby allowing the inflow of fuel into the fuel tank and by the spring holding force at the time of refueling stop. The backflow prevention valve which prevents a backflow of fuel by closing a valve is provided. Examples of this kind of check valve include: a valve body held by a spring in a valve closing direction in a housing; A valve seat having an abutting surface formed in a direction perpendicular to the moving direction of the valve body; A valve body support piece which is formed along the periphery of the valve body and opens and closes the valve by being in contact with the valve seat; It is known that it is arrange | positioned along the periphery of a valve body, and the elastic sealing member clamped between a valve body support piece and a valve seat at the time of valve closing (refer patent document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 2005-226617

By the way, the non-return valve of the said patent document 1 has the contact surface of the contact surface of the valve seat formed in the direction perpendicular | vertical to the moving direction of a valve body in the valve closing state, and the contact surface of the valve body support which opposes this. Because of the configuration in which the elastic sealing member is sandwiched between, the valve body easily swings in the lateral direction (that is, the direction perpendicular to the moving direction of the valve body). In addition, in the configuration in which the elastic sealing member is sandwiched between the abutting surface of the valve seat and the abutting surface of the valve body support piece as described above, the required pressing contact force of the valve body support piece (elastic sealing member) with respect to the valve seat. There is also a problem that it is difficult to secure a stable.

The present invention was devised in view of the problems of the prior art, and an object thereof is to provide a non-return valve which prevents fluctuation of the valve body in the lateral direction and improves the sealing property of the valve.

The 1st invention for solving the said subject is the backflow prevention valve 1 provided in the liquid supply path | route (fuel supply path P), Comprising: The housing 2 in which the flow path was formed, and the liquid flow to the said housing 2 A valve body 3 movably accommodated in a direction, a gripping means (compression spring 5) for holding the valve body 3 in the valve closing direction, and the valve body 3 is inserted when the valve is closed. And a ring-shaped elastic sealing member 4 having a flow path opening 41 to be formed, wherein the valve body 3 has an annular inclined surface 43a at the end of the flow path opening 41 when the valve is closed. 41a).

Further, as a second invention, the elastic sealing member 4 is formed along the circumferential direction on the inner circumferential surface thereof, and is a groove portion (sealed groove 4b) which is compressed by pressing contact with the valve body 3 when the valve is closed. )} Can be configured.

Moreover, as a 3rd invention, the said housing 2 is connected to the 1st member (fuel discharge pipe 11) which accommodates the said valve body 3, and the said valve closing direction side of the 1st member 11. As shown in FIG. It has a 2nd member (connection pipe 12), and the said elastic sealing member 4 can be set as the structure clamped by the said 1st member 11 and the said 2nd member 12. As shown in FIG.

According to the first aspect of the present invention, since the annular inclined surface of the valve body is pressed in contact with the end edge of the opening portion of the flow path of the elastic sealing member when the valve is closed, the valve body is in the transverse direction (that is, the moving direction of the valve body). The fluctuation in the vertical direction) is prevented, and the pressure contact force of the valve body against the elastic sealing member (valve seat) is increased, thereby improving the sealing property of the valve.

Further, according to the second aspect of the invention, since the groove portion of the elastic sealing member is compressed by the pressing contact with the valve body when the valve is closed, the adhesion between the valve body and the elastic sealing member is increased, so that the sealing property of the valve is increased. It is possible to further improve.

Further, according to the third aspect of the invention, since the elastic sealing member is configured to be clamped by the first member and the second member, it is not necessary to install a member for fixing the elastic sealing member to the housing or the like. It becomes possible to reduce.

1 is a perspective view of a non-return valve according to an embodiment;
2 is an exploded perspective view of the non-return valve according to the embodiment;
3 is a cross-sectional view of the non-return valve in the valve open state according to the embodiment;
4 is a sectional view of a non-return valve in a valve closed state according to the embodiment;
FIG. 5 is an enlarged cross-sectional view of part X in FIG. 4. FIG.
6 is an enlarged cross sectional view showing a first modification of the elastic sealing member;
7 is an enlarged cross sectional view showing a second modification of the elastic sealing member;

EMBODIMENT OF THE INVENTION Hereinafter, the backflow prevention valve 1 which concerns on embodiment of this invention with reference to drawings is demonstrated in detail.

The non-return valve 1 which concerns on embodiment of this invention is arrange | positioned in the downstream end of the fuel supply path P (refer FIG. 3) of the fuel tank T of an automobile, and opens a valve at the time of oil supply. This permits the inflow of fuel (gasoline or the like) into the fuel tank T, and closes the valve at the stop of refueling to prevent backflow of the fuel (including evaporated gas).

As shown in FIGS. 1 and 2, the non-return valve 1 includes a housing 2 in which a flow path is formed, and a valve body accommodated in the housing 2 along the fuel flow direction (see arrow A in FIG. 3) to move forward and backward. (3), a ring-shaped elastic sealing member 4 functioning as a valve seat in which the valve body 3 is seated when the valve is closed, and a compression spring 5 for holding the valve body 3 in the valve closing direction. And the spring support member 6 which supports the compression spring 5 as a main member.

The housing 2 includes a fuel discharge tube 11 as a first member that accommodates the valve body 3 and discharges fuel into the fuel tank T, and an upstream side of the fuel discharge tube 11 (valve). And a connecting pipe 12 as a second member fixed to the fuel tank T as well as connected to the closing direction side).

The fuel discharge pipe 11 has a substantially cylindrical shape, and a plurality of fuel discharge openings 21 are formed in the circumferential wall thereof. A plurality of guide ribs 22 are formed on the inner circumferential surface of the fuel discharge pipe 11 to guide the movement of the valve body 3 along the axial direction thereof. Each guide rib 22 is disposed between adjacent fuel discharge openings 21 so as to be spaced apart from each other in the circumferential direction. Further, a plurality of locking holes 23 are formed on the downstream side of the circumferential wall of the fuel discharge pipe 11, and each of the locking holes 23 has a plurality of locking protrusions 24 protruding from the outer circumferential surface of the spring support member 6. ) Are each fitted. As a result, the spring supporting member 6 is inserted into and attached to the downstream opening of the fuel discharge pipe 11. In addition, a plurality of cutout grooves 25 are formed at the lower end of the circumferential wall of the fuel discharge pipe 11, and each cutout groove 25 has a plurality of restriction ribs 26 protruding from the outer circumferential surface of the spring support member 6. Are fitted respectively. As a result, the rotational movement of the spring support member 6 with respect to the fuel discharge pipe 11 is restricted. Moreover, the shaft diameter part 27 located in the upper end side of the fuel discharge pipe 11 is used for connection with the said connection pipe 12. As shown in FIG.

The connecting pipe 12 has a substantially cylindrical shape, an upstream portion 12a to which an oil supply pipe 30 (see FIG. 3) having an oil supply port (not shown) is connected, and a downstream portion connected to the fuel discharge pipe 11 ( 12b) and a flange portion 12c formed between these upstream portions 12a and downstream portions 12b. Inside the upstream portion 12a, a metal collar member 31 for reinforcing the connection portion connected to the oil supply pipe 30 is inserted. The plurality of locking projections 32 protruding on the outer circumferential surface of the downstream portion 12b are engaged with the locking holes 33 formed in the shaft diameter portion 27 of the fuel discharge pipe 11, respectively. Thereby, the connection pipe 12 is connected with respect to the fuel discharge pipe 11 in the state in which the downstream part 12b was inserted in the inside of the shaft diameter part 27 of the fuel discharge pipe 11. In addition, the plurality of regulating ribs 34 protruding on the outer circumferential surface of the downstream portion 12b are fitted into the cutout grooves 35 formed on the upper end of the circumferential wall of the shaft diameter portion 27 of the fuel discharge pipe 11, respectively. Thereby, the rotational movement of the connecting pipe 12 with respect to the fuel discharge pipe 11 is regulated. As shown in Fig. 3, the connecting pipe 12 is connected to the resin fuel tank T made of resin while the downstream portion 12b is inserted into the insertion hole 36 of the fuel tank T. It is fixed by welding.

2 to 4, the valve body 3 has a cross-sectional shape that is approximately X-shaped in the valve closing direction and is inserted into the flow path opening 41 of the elastic sealing member 4 when the valve is closed. And a shoulder portion 43 which is formed so as to be connected to the downstream periphery of the protruding portion 42 and which is in pressure contact with the end edge 41a of the flow path opening 41 of the elastic sealing member 4 when the valve is closed. ) And a vertical trunk portion 44 formed on the downstream side of the shoulder portion 43. The protrusion part 42 is arrange | positioned at the center part through which the axis line of the valve body 3 passes, and has comprised the longitudinal form or the terrace shape. The shoulder portion 43 has an annular inclined surface 43a that forms a rotating curved surface (that is, a curved surface obtained by rotating a line segment or curve in the axial circumferential direction of the valve body 3). Moreover, the spring accommodating part 45 which accommodates the one end side of the compression spring 5 is formed in the downstream of the valve body 3. The other end side of the compression spring 5 is fitted to a spring fixing protrusion 6a formed at the center of the spring support member 6. A plurality of openings 6b are formed around the spring fixing protrusion 6a.

The elastic sealing member 4 is made of an elastic material such as rubber, and the mounting groove 4a formed along the circumferential direction on the outer peripheral surface thereof protrudes on the inner peripheral surface of the downstream end of the shaft diameter portion 27 of the fuel discharge pipe 11. It is attached by fitting in the formed annular piece 51. Moreover, the elastic sealing member 4 is formed along the circumferential direction in the inner peripheral surface, and has the sealing groove 4b compressed by press contact with the valve body 3 at the time of valve closing. The inner circumferential surface of the passage opening portion 41 is formed to be substantially connected to the inner circumferential surface of the connecting pipe 12. Moreover, the elastic sealing member 4 is clamped between the lower end of the connection pipe 12 (downstream part 12b) and the upper surface of the annular protrusion 51 of the fuel discharge pipe 11.

In addition, the housing 2, the valve body 3, and the spring support member 6 constituting the non-return valve 1 may have swelling resistance or permeability to fuel in addition to mechanical properties. It can be formed from a resin material (for example, polyacetal) in consideration of the property.

In the non-return valve 1 configured as described above, as shown in FIG. 3, fuel flows in the direction of arrow A through the fuel supply path P when the vehicle is refueled. At this time, the valve body 3 opens the fuel discharge opening 21 in the closed position to close the fuel supply path P shown in FIG. 4 while the valve body 3 compresses the compression spring 5 by the pressure of the introduced fuel. Move downstream to the open position. As a result, the fuel is discharged into the fuel tank T by flowing from the central protrusion 42 to the respective fuel discharge openings 21 along the shoulder portion 43 around it as indicated by arrow B. Moreover, the pressure of the fuel for moving the valve body 3 to the downstream side can be adjusted by changing the shape and size of the protrusion part 42.

On the other hand, when oil supply of the automobile is stopped, the valve body 3 returns to the closed position again by the holding force of the compression spring 5 as shown in FIG. At this time, as shown in FIG. 5, the shoulder part 43 of the valve body 3 is pressed against the edge 41a of the elastic sealing member 4, and the sealing groove 4b is compressed. As a result, the elastic sealing member 4 is brought into close contact with the valve body 3 by elastically deforming the end edge 41a along the annular inclined surface 43a.

In this way, the non-return valve 1 according to the present invention has an annular inclined surface 43a of the valve body 3 at the end edge 41a of the flow path opening 41 of the elastic sealing member 4 when the valve is closed. Since the structure is in press-contact, swinging in the horizontal direction of the valve body 3 (that is, the direction perpendicular to the moving direction of the valve body 3) is prevented, and the valve with respect to the elastic sealing member 4 is prevented. As the pressing contact force of the sieve 3 increases, the sealing property of the valve improves.

In the non-return valve 1, the sealing groove 4b of the elastic sealing member 4 is compressed by pressing contact with the valve body 3 when the valve is closed. By increasing the adhesiveness of the elastic sealing member 4, it is possible to further improve the sealing property of the valve.

Further, in the non-return valve 1, the elastic sealing member 4 is clamped by the fuel discharge pipe 11 and the connecting pipe 12, so that the member for fixing the elastic sealing member 4 is fixed. Need not be attached to the housing 2 or the like, so that the number of parts can be reduced.

FIG. 6 is an enlarged cross-sectional view as shown in FIG. 5, illustrating a first modification of the elastic sealing member 4. In addition, the matters which are not specifically mentioned below are the same as the elastic sealing member 4 shown in FIG.

As shown in Fig. 6, the elastic sealing member 4 has a sealing groove 4b on the outer circumferential surface side thereof, which is compressed by the pressing contact with the valve body 3 when the valve is closed. The end edge 41a of the elastic sealing member 4 is inclined downward in the initial state (before deformation) as indicated by the dashed-dotted line in FIG. 6, and the magnitude of the inclination is the ring of the shoulder 43. It is set larger than the shape inclined surface 43a. Then, the annular inclined surface 43a is pressed against the end edge 41a of the elastic sealing member 4 so that the end edge 41a is elastically deformed to follow the annular inclined surface 43a so that the valve body 3 Is in close contact with.

Thus, by forming the sealing groove 4b and the end edge 41a of the elastic sealing member 4, the fall of the sealing property by the pressure in a fuel tank can be suppressed. That is, the pressure in the fuel tank acting on the outer circumferential surface side of the elastic sealing member 4 acts in the direction of pressing the end edge 41a of the elastic sealing member 4 by the annular inclined surface 43a.

FIG. 7 is an enlarged cross-sectional view as shown in FIG. 5, illustrating a second modification of the elastic sealing member 4. In addition, the matters which are not specifically mentioned below are the same as the elastic sealing member 4 shown in FIG.

As shown in FIG. 7, the elastic sealing member 4 does not have the sealing groove 4b as shown in FIG. 5, but the end edge 41a protrudes horizontally from the lower part of the inner peripheral surface toward the inside. Then, the annular inclined surface 43a is push-contacted to the end edge 41a of the elastic sealing member 4 so that the end edge 41a is elastically deformed to follow the annular inclined surface 43a so that the valve body 3 is reduced. Is in close contact with.

Thus, the elastic sealing member 4 has the advantage that the structure is not provided with the sealing groove 4b, and the manufacturing becomes easy.

Although this invention was demonstrated in detail based on the specific embodiment, the said embodiment is only an illustration to the last, and this invention is not restrict | limited by these embodiment. For example, the housing of the non-return valve according to the present invention does not necessarily need to be configured as an independent member. For example, the housing may be formed as part of an oil supply pipe.

1-check valve 2-housing
3-valve body 4-elastic sealing member
4b-Sealed Groove 5-Compression Spring
6-spring support member 11-fuel discharge tube (first member)
12-connector (second member) 21-fuel discharge opening
27-Shaft diameter 30-Lubrication pipe
41-flow path opening 41a-end edge
42-overhang 43-over shoulder
43a-Annular inclined surface 51-Annular stone piece
P-Fuel Supply Path (Liquid Supply Path) T-Fuel Tank

Claims (3)

As a non-return valve 1 installed in the liquid supply passage P,
A housing (2) having a flow path formed therein, a valve body (3) housed in the housing (2) so as to be movable along the liquid flow direction, and a holding means (5) for holding the valve body (3) in the valve closing direction; And a ring-shaped elastic sealing member 4 having a flow path opening portion 41 into which the valve body 3 is inserted when the valve is closed.
The valve body (3) is a check valve, characterized in that the annular inclined surface (43a) is in pressure contact with the end edge (41a) of the flow path opening 41 when the valve is closed.
The method according to claim 1,
The resilient sealing member (4) has a groove (4b) formed along its circumferential direction on the inner circumferential surface thereof and having a groove portion (4b) compressed by the pressing contact with the valve body (3) when the valve is closed.
The method according to claim 1 or 2,
The housing 2 has a first member 11 for receiving the valve body 3 and a second member 12 connected to the valve closing direction side of the first member 11,
The elastic sealing member (4) is a non-return valve, characterized in that the holding by the first member (11) and the second member (12).

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