JP4881659B2 - Liquid shut-off valve device - Google Patents

Description

  The present invention relates to a liquid shut-off valve device which is installed at the upper part in a sealed container and has a function of communicating with the outside, and exhausts the gas in the container with the supplied liquid.

  The liquid shut-off valve device is arranged at an upper part in a fuel tank of an automobile, for example, and is configured to communicate with an external canister. This liquid shut-off valve device exhausts the evaporative gas to the canister as the fuel is supplied into the fuel tank. When the fuel supply reaches a predetermined level, the communication with the canister is automatically shut off. As a result, the liquid shut-off valve device can detect the fuel amount and prevent the fuel from flowing out. Examples of this type of device include the vent valve assembly disclosed in Patent Document 1.

  Here, the ventilation valve assembly of Patent Document 1 will be briefly described. The ventilation valve assembly includes a housing and a float assembly housed in the housing. By raising and lowering the float assembly, a ventilation passage with the canister is provided. It is configured to open and close. In addition, the float assembly contains an elastic seal member at the upper end of the interior, and when the fuel supply reaches a predetermined level, the elastic seal member and the valve seat of the housing come into contact with each other to be sealed, and the ventilation passage Communication is interrupted.

  In the liquid cutoff valve device, a certain gap is formed between the wall surface of the housing and the float so that the float can slide smoothly in the housing. For this reason, when the liquid shut-off valve device swings in the lateral direction, the float also swings in the lateral direction, and as a result, the close contact state (sealed state) between the elastic seal member provided at the upper end of the float and the valve seat is destroyed, There was a risk that the fuel would blow into the ventilation passage.

In particular, when the elastic seal member that abuts the valve seat is formed on a flat surface as in the vent valve assembly of Patent Document 1, the resistance to lateral external force is small, and thus the above seal breakage occurs. Cheap.
Further, in the fuel shut-off valve disclosed in Patent Document 2, the seat member that comes into contact with the seal portion is made plastic, and further, as the fuel level rises, the seat member comes into contact with the seal portion in a stepwise manner to block outflow of fuel. is doing. According to this fuel shut-off valve, the resistance force against the lateral external force is large, and therefore it seems possible to maintain the sealed state against small rolls. If a large lateral load is applied and the float swings sideways, there is a risk that the seal will be broken.
JP 2003-193925 A JP 2005-297787 A

  The present invention has been made in view of such circumstances. Even when a lateral external force acts on the float, the sealing performance by the valve means provided at the upper end of the float is maintained, and leakage of liquid to the outside is prevented. An object of the present invention is to provide a liquid shut-off valve device that can be prevented.

In order to achieve the above object, the invention according to claim 1 is provided in an upper space in a sealed container for storing a liquid, allows gas to flow into and out of the outside, and prevents leakage of the liquid from the sealed container. A liquid shut-off valve device for shutting off,
A housing divided into an upper chamber and a lower chamber across a partition plate having an opening, and a float that is slidably accommodated in the lower chamber and rises by receiving buoyancy from the liquid in the sealed container,
In the upper chamber, an exhaust port communicating with the outside of the sealed container is opened,
The upper end of the float is provided with valve means for closing the opening of the partition plate as the float rises.
The valve means is provided with a movable valve that is in contact with the peripheral edge of the opening of the partition plate and is movable in a radial direction perpendicular to the center axis of the float with respect to the float. The movement allowable range is set larger than a range in which the float can move in the same direction with respect to the housing.

According to a second aspect of the present invention, on the premise of the first aspect, a guide wall for accommodating the movable valve inside is formed at an upper end portion of the float, and a peripheral surface of the movable valve is formed on the guide wall. The range of movement of the movable valve in the radial direction is limited by contact,
And a convex part is formed in either one of the upper end surface central part of the float or the lower surface central part of the movable valve, and a concave part with which the convex part abuts is formed on the other. The swing fulcrum of the movable valve is configured.

Furthermore, the invention of claim 3 is based on claim 2, and the movable valve includes a movable valve body and a valve member made of an elastic material,
The valve member has a plate-like elastic valve portion that contacts the periphery of the opening portion of the partition plate and closes the opening portion, and a mounting convex portion that is formed at a central portion of the lower surface of the elastic valve portion,
The movable valve main body includes a first floor plate in which the convex portion or the concave portion is formed on a lower surface, and a second floor plate provided above the first floor plate via a predetermined gap,
Further, the second floor plate is formed with a mounting hole penetrating both the upper and lower surfaces, and the mounting convex portion of the valve member is pushed into the mounting hole from the upper surface and fixed. A part of the mounting convex portion pushed out from the lower surface is disposed in a gap formed between the first and second floor boards.

Further, the invention of claim 4 is based on claims 1 to 3, wherein the movable valve is housed inside a guide wall formed at the upper end of the float, and the upper end of the float A movable valve holding cap that is mounted and prevents the movable valve from falling off from the upper end of the float and restricts the vertical movement range of the movable valve;
The movable valve is always urged upward by an urging member.

  According to the first aspect of the present invention, the float can move in the same direction relative to the housing even when an external force in the radial direction (also referred to as a lateral direction) acts on the float in a state where the opening is closed by the movable valve. Since the allowable movement range of the movable valve in the same direction with respect to the float is larger than the range, the movable valve does not follow the movement of the float, so that the movable valve is in close contact with the opening and maintains the closed state. Can do.

  Here, as in the second aspect of the invention, the movable valve swings with respect to the float by forming the swinging fulcrum of the movable valve by the convex part and the concave part that are in contact with each other. When the external force is applied, it is possible to absorb the radial external force acting on the float by swinging the float around the swing fulcrum, so that an excessive external force acts on the possible valve. Without this, the closed state can be maintained by keeping the posture of the movable valve constant with respect to the opening.

  Further, by configuring the movable valve body as in the invention of claim 3, it is possible to simply push the mounting convex part of the valve member into the gap provided between the first and second floor plates, and no adhesive is required. Since the valve member can be easily and reliably attached to the movable valve main body, good assembly workability can be obtained.

  Furthermore, according to the invention of claim 4, the movable valve can be flexibly moved while preventing the movable valve from dropping off from the upper end of the float by the movable valve holding cap.

  As described above, according to the present invention, the float and the valve seat are kept sealed during the swinging, so that the liquid can be reliably prevented from flowing out.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 16 are diagrams showing a configuration of a liquid shut-off valve device according to an embodiment of the present invention. 1 is a perspective view showing the overall configuration of the liquid shut-off valve device, and FIG. 2 is a side sectional view showing a state in which the liquid shut-off valve device is installed in the fuel tank.
As shown in FIG. 1, in the liquid shut-off valve device, an outer shell is formed by a housing 1 that is resin-molded into a cylindrical shape. As shown in FIG. 2, this liquid shut-off valve device is provided in an upper space in a fuel tank 2 (sealed container) that stores liquid fuel (hereinafter simply referred to as fuel) of an automobile or the like, and is connected to an exhaust connection passage 3. And communicates with an external canister 4. When fuel is supplied into the fuel tank 2, a gas such as fuel vapor (hereinafter referred to as evaporative gas) filling the fuel tank 2 is discharged to the external canister 4 through the liquid shut-off valve device. Further, when the fuel supply fuel is nearly full, the gas discharge path in the liquid shut-off valve device is closed, and fuel leakage is blocked.

[Configuration of each member of liquid shut-off valve device]
FIG. 3 is a development view showing the overall configuration of the liquid shut-off valve device according to the present embodiment, wherein (a) is a front view, (b) is a side view, (c) is a top view, and (d) is a bottom view. It is. 4 is a cross-sectional view showing the overall configuration of the liquid shut-off valve device, where (a) is a front cross-sectional view, (b) is a cross-sectional view taken along line AA in FIG. 3, and (c) is B in FIG. FIG. 5 is an exploded perspective view showing the overall configuration of the liquid shut-off valve device, and FIG. 6 is a perspective view showing the configurations of the housing body and the cap member.

  As shown in FIGS. 3 to 6, the housing 1 that forms the outer shell of the liquid shut-off valve device has a cover head member 20 attached to one end (upper end) of the housing main body 10, and other housing main body 10. The cap member 30 is attached to the end (lower end). In the housing 1, an upper chamber 21 is formed in a portion corresponding to the inside of the lid head member 20, and a lower chamber 11 is formed in a portion corresponding to the inside of the housing main body 10 (see FIG. 4A). A float 40 and a spring 41 are accommodated in the lower chamber 11 of the housing 1 (see FIG. 5).

  As shown in FIG. 6, the housing body 10 includes a cylindrical outer cylinder 12, a partition plate 13 that covers the upper end surface of the outer cylinder 12, and an inner wall that extends in the axial direction inside the outer cylinder 12. 14. The lower chamber 11 described above is formed by the internal space of the outer cylinder 12. On the side peripheral surface of the outer cylinder 12, first ventilation holes 15 are formed at opposing positions. Further, a second vent hole 16 is formed at a position below the first vent hole 15. These vent holes 15 and 16 are for allowing the evaporative gas and fuel in the fuel tank 2 to flow into and out of the internal space of the outer cylinder 12.

  The upper chamber 21 and the lower chamber 11 of the housing 1 are divided by a partition plate 13 (see FIG. 4A). An opening 17 is provided at the center of the partition plate 13. The opening 17 allows the upper chamber 21 and the lower chamber 11 of the housing 1 to communicate with each other. On the upper surface side of the partition plate 13, as shown in FIG. 6, a cylindrical partition wall 18 extends upward from the periphery of the opening 17. The partition wall 18 has a notch 18a. The cutout portion 18 a is formed so as to cut off from the upper end of the partition wall 18 to the edge of the opening portion 17 in the axial direction.

  Further, as shown in FIG. 5, the partition plate 13 has an outer peripheral edge extending outward from the outer cylinder 12, and further, a position on the upper surface of the partition plate 13 is located at a certain distance inside from the outer peripheral edge. Further, an annular convex portion 13a is projected. The annular convex portion 13a prevents burrs that are generated when the lid head member 20 and the partition plate 13 described later are welded. Further, the opening 17 of the partition plate 13 is formed with a convex portion 17a that protrudes downward from the peripheral edge of the opening end on the lower surface side (lower chamber side).

  As shown in FIG. 6, the inner wall 14 of the housing main body 10 is configured to substantially hang downward from the bottom surface of the partition plate 13 in the lower chamber 11. The inner wall 14 is provided concentrically with a certain gap inside the outer cylinder 12. The inner walls 14 are provided at positions facing each other. As shown in FIG. 4C, the pair of inner walls 14 has an inner surface curved in an arc shape to form a float guide support surface 14a so that the float 40 accommodated in the lower chamber 11 can slide freely. It has a function to support and guide. A plurality of ribs 14b (total of six in this embodiment) extending in the axial direction are formed on the inner peripheral surfaces of the inner walls 14.

As shown in FIG. 6, the pair of inner walls 14 is disposed at a position facing the first ventilation hole 15 formed in the outer cylinder 12. The widths of both inner walls 14 are larger than the opening width of the first vent hole 15. Accordingly, the inner wall 14 is disposed over the entire area inside the first vent hole 15.
Here, the outer peripheral surface of the inner wall 14 and the inner peripheral surface of the outer cylinder 12 are connected via a connecting wall 19 extending in the axial direction. The connecting wall 19 extends in the axial direction at the intermediate portion of the first vent hole 15, and the opening of the first vent hole 15 is divided into right and left by the connecting wall 19. Therefore, the evaporative gas in the fuel tank 2 flows into the outer cylinder 12 from the first vent hole 15 while being divided in the left-right direction of the connecting wall 19. The vaporized gas that has flowed in this way flows into the lower chamber 11 of the housing 1 so as to circulate from both left and right ends of the inner wall 14.

  The lid head member 20 of the housing 1 is resin-molded in a cup shape, and the opening surface at the lower end is welded and fixed to the upper surface of the partition plate 13 of the housing body 10. The internal space of the lid head member 20 forms an upper chamber 21. The lid head member 20 takes in the exhaust gas in the fuel tank 2 through the exhaust port 22 communicating with the outside of the fuel tank 2 via the exhaust connection passage 3 shown in FIG. A gas introduction port 23 leading to the port 22 is provided on each outer peripheral wall.

  Here, the function of each device and component provided in the fuel tank 2 will be described. When the fuel is full, the liquid shut-off valve device closes the opening 17 of the partition plate 13 as will be described later. Prevents fuel leakage. However, when the opening 17 is closed, the evaporative gas discharge is also blocked, and the internal pressure in the fuel tank 2 increases. In order to prevent this, a cut valve 6 and a check valve 7 are provided in the fuel tank 2 so that the evaporated gas can be discharged even when the tank is full (see FIG. 2). The cut valve 6 has a function of taking in the evaporated gas in the fuel tank 2, and the check valve 7 evaporates sent from the cut valve 6 when the pressure received from the cut valve 6 rises above a certain value. It has the function of a safety valve that introduces gas into the liquid shut-off valve device.

  The gas introduction port 23 of the lid head member 20 has a function of receiving the evaporated gas sent from the cut valve 6 and the check valve 7 into the upper chamber 21. Note that the evaporative gas may be discharged when the tank is full without exhausting the liquid shut-off valve device directly to the external canister 4. In this case, it is not necessary to provide the gas introduction port 23 in the liquid cutoff valve device.

  In addition, openings 22a and 23a of the exhaust port 22 and the gas introduction port 23 communicated from the outer peripheral wall are formed in the inner peripheral surface of the lid head member 20 (see FIG. 4A). The opening 22 a of the exhaust port is provided at a position protruding inward from the inner peripheral surface of the upper chamber 21. On the other hand, the opening 23a of the gas introduction port is shifted in the circumferential direction to a position not facing the opening 22a of the exhaust port.

  The cap member 30 of the housing 1 is resin-molded into a bottomed cylindrical shape and closes the lower end opening surface of the outer cylinder 12 when the housing body 10 is assembled. As shown in FIG. 6, a first hole group 31 is formed on the bottom wall of the cap member 30 on the outer side than the inner diameter of the inner wall 14 of the housing body 10. The hole group 32 is formed. The first hole group 31 is a set of through holes having a relatively large diameter, while the second hole group 32 is a set of through holes smaller than the first hole group 31. The sum total of the opening areas of the through holes constituting the first hole group 31 is larger than the sum of the opening areas of the through holes constituting the second hole group 32. Therefore, in particular, the evaporative gas easily flows into the lower chamber 11 of the housing 1 from the first hole group 31.

  Further, on the peripheral surface of the cap member 30 is provided a vent hole incision 33 for opening the second vent hole 16 provided on the peripheral wall of the outer cylinder 12 (see FIGS. 3A and 6). ). Further, a valve seat 34 on which the float 40 and the spring 41 are placed is provided on the inner bottom surface of the cap member 30 (see FIG. 4A).

  The float 40 is slidably accommodated in the lower chamber 11 of the housing 1 and has a function of receiving buoyancy from the fuel in the fuel tank 2 and rising (see FIG. 4A). A movable valve 50 (valve means) that closes the opening 17 of the partition plate 13 as the float 40 rises is provided at the upper end of the float 40.

  The float 40 is a resin-molded member having a substantially cylindrical shape whose upper end is closed. A spring seat 42 is formed in the internal space of the float 40, and the spring 41 is inserted into the internal space when the float 40 is accommodated in the lower chamber 11. The float 40 is configured with an arbitrary weight so as to obtain a buoyancy by the supplied fuel and an elastic force by the spring 41 so as to rise appropriately. The outer diameter of the float 40 is set to be slightly smaller than the inner diameter of the inner wall 14 formed in the housing body 10.

FIG. 7 is an exploded perspective view showing a float of the liquid shut-off valve device according to the present embodiment.
As shown in the figure, on the outer peripheral surface of the float 40, four ribs 43 are provided in the axial direction, and a pair of flat surfaces 44 serving as a positioning reference when accommodated in the lower chamber 11 are provided. Yes. A guide wall 45 extending in the axial direction with a predetermined inner diameter is formed at the upper end of the float 40, and a convex portion 46 is formed at the center of the upper end surface of the guide wall 45. As for the convex part 46 of the float 40 of this embodiment, the top part is formed in the circular arc surface. In addition to the movable valve 50, an urging member 47 and a movable valve holding cap 48 are provided at the upper end of the float 40.

  The urging member 47 is arranged around the convex portion 46 provided at the upper end portion of the float 40 and urges the movable valve 50 accommodated inside the guide wall 45. The movable valve holding cap 48 is an annular resin molded member having an open center. The movable valve holding cap 48 is attached to the outer peripheral surface of the guide wall 45 of the float 40 in a state where the movable valve 50 is accommodated inside the guide wall 45.

  The movable valve 50 serving as valve means includes a movable valve main body 51 and a valve member 52. The movable valve main body 51 includes a first floor plate 54 in which a concave portion 53 that contacts the convex portion 46 of the float 40 is formed on the lower surface, and a second floor plate provided above the first floor plate 54 via a predetermined gap. 55 (see FIG. 7). The concave portion 53 of the movable valve 50 is formed on an arc surface having a large curvature with respect to the convex portion 46 of the float 40. The second floor plate 55 of the movable valve main body 51 is formed with mounting holes 56 that penetrate both the upper and lower surfaces. Furthermore, a plurality of groove portions 55a (total of six in this embodiment) extending radially from the hole edge of the mounting hole 56 to the outer peripheral edge of the second floor plate 55 are formed radially on the upper surface of the second floor plate 55. ing.

FIG. 8 is an enlarged view of the movable valve of the liquid shut-off valve device according to the present embodiment, where (a) is a side view of the valve member, (b) is a side sectional view of the valve member, and (c) is a side view. Side surface sectional drawing of a movable valve, (d) is a perspective view of a movable valve.
As shown in FIGS. 8A and 8B, the valve member 42 of the movable valve 50 is formed of an elastic material and is mounted on the upper surface of the second floor plate 55 of the movable valve main body 51. The valve member 52 includes a plate-like elastic valve portion 57 whose upper surface is a flat surface, and a mounting convex portion 58 formed at the center of the lower surface of the elastic valve portion 57.

Next, the configuration of the liquid shut-off valve device according to this embodiment will be described in more detail along the assembly procedure.
As shown in FIGS. 7 and 8C, the movable valve 50 is configured to push the mounting convex portion 58 of the valve member 52 into the mounting hole 56 of the movable valve body 51 from the upper surface and fix it. At this time, in the movable valve 50, a part of the mounting convex portion 58 pushed out from the lower surface of the mounting hole 56 is disposed in a gap formed between the first and second floor plates 54 and 55.

  The movable valve 50 assembled as described above is accommodated together with the urging member 47 inside the guide wall 45 formed at the upper end portion of the float 40. By this urging member 47, the movable valve 50 is always urged upward. Further, a movable valve holding cap 48 is fitted into the upper end of the float 40 from above. The movable valve holding cap 48 restricts the movable range of the movable valve 50 in the vertical direction and prevents the movable valve 50 from falling off from the upper end of the float 40.

Further, when the movable valve 50 is assembled, the concave portion 53 of the first floor plate 54 and the convex portion 46 of the float 40 are in contact with each other to constitute a swing fulcrum of the movable valve 50. For this reason, the movable valve 50 is movable in the radial direction orthogonal to the central axis of the float 40 within the allowable movement range. Further, the allowable movement range of the movable valve 50 is formed by the inner peripheral surface of the guide wall 45 of the float 40, and is regulated by the peripheral surface of the movable valve 50 coming into contact with the guide wall 45.
In the present embodiment, the convex portion 46 is provided on the upper end of the float 40 and the concave portion 53 is provided on the bottom surface of the movable valve main body 51. However, it goes without saying that the location of the concave and convex portions may be reversed. .

FIG. 9 is a view showing the upper chamber of the liquid shut-off valve device according to the present embodiment, wherein (a) is a perspective view, (b) is a cross-sectional view taken along the line CC of FIG. 3, and (c) is a diagram. 4 is an enlarged view of a portion D of FIG.
As shown in FIGS. 4 and 9, an upper chamber 21 is formed in the upper portion of the housing 1 by welding the opening surface of the lid head member 20 to the upper surface of the partition plate 13 of the housing body 10. The upper chamber 21 is formed by an annular convex portion 13 a provided on the partition plate 13 and an inner peripheral surface of the lid head member 20. Moreover, as shown in FIG.9 (c), the welding of the housing main body 10 and the lid head member 20 of this embodiment is firmly fixed by vibration welding. The housing main body 10 is provided with burr pools 13b on both sides of the vibration welding position with the lid head member 20 to prevent inflow of burrs that may occur due to vibration welding. Thereby, the lid head member 20 is welded without impairing the inside of the upper chamber 21 or the appearance of the liquid shut-off valve device.

As shown in FIGS. 9A and 9B, the welding position of the housing body 10 and the lid head member 20 is determined by the positional relationship of the notches 18 a provided in the cylindrical partition wall 18. That is, in the upper chamber 21, the notch 18a is adjusted to be on the opposite side not facing the opening 22a of the exhaust port. Further, the position of the notch 18a is a position that does not oppose the above-described opening 23a of the gas introduction port. Thereby, even if the liquid is sent from the gas introduction port, it is prevented in the upper chamber, and the liquid does not flow out to the exhaust port.
Of course, the positional relationship between the openings 22a and 23a of the exhaust port and the gas introduction port and the notch portion 18a is not limited to the present embodiment. The opening 22a, the gas introduction port opening 23a, and the notch 18a may be positioned at 120 ° intervals.

  As shown in FIGS. 4 and 5, in the liquid shutoff valve device, the float 40 and the spring 41 assembled with the movable valve 50 are accommodated in the lower chamber 11 of the housing 1 and are closed by the cap member 30. The float 40 is inserted along the float guide support surface 14 a of the inner wall 14 of the housing body 10, and is arranged so that a flat surface 44 formed on the side peripheral surface is located in a gap between the paired inner walls 14. At this time, the float 40 is placed on the valve seat 34 of the cap member 30, and the second hole group 32 of the cap member 30 is located just below the float 40. The spring 41 is elastically interposed between the valve seat 34 of the cap member 30 and the spring seat 42 inside the float 40.

  In addition, a certain clearance C is formed between the float 40 and the inner wall 14 when the lower chamber 11 is accommodated in the float 40. In this clearance C, ribs 43 provided on the side peripheral surface of the float 40 or ribs 14b provided on the inner wall 14 side are interposed, so that the peripheral surfaces facing each other when the float 40 swings or the like. It is the structure which is line-contacted with respect to. Thereby, when the float 40 slides, rotation of the float 40 itself is prevented and contact friction with the inner wall 14 is suppressed.

[Operation of liquid shut-off valve device]
10A and 10B are side cross-sectional views showing the operation of the liquid shut-off valve device according to the present embodiment during fuel supply. FIG. 10A is a state before the fuel reaches the liquid shut-off valve device, and FIG. An initial state where the shut-off valve is reached, (c) is a state where the fuel is full.
As shown in FIG. 10A, in the liquid shut-off valve device installed at the upper part in the fuel tank 2, when the fuel does not reach the device, the float 40 in the lower chamber 11 is replaced by the valve seat 34 of the cap member 30. It is in the state where it was mounted. At this time, the opening 17 that communicates the upper chamber 21 and the lower chamber 11 is open, and the evaporative gas can flow freely. Therefore, when fuel is supplied into the fuel tank 2, the internal pressure in the tank rises, and the evaporative gas can be guided in the order of the lower chamber 11 and the upper chamber 21 and discharged to the outside.

  As shown in FIG. 10B and FIG. 6, when the fuel that has been supplied reaches the fuel cutoff valve device, it enters the lower chamber 11 from the first hole group 31 and the second hole group 32 of the cap member 30. Inflow. As described above, the cap member 30 is configured such that the first hole group 31 has a larger total opening area than the second hole group 32. Therefore, the fuel flowing into the lower chamber 11 is stronger in the first hole group 31 than in the second hole group 32. For this reason, the fuel in the lower chamber 11 creates convection from the periphery of the float 40 toward the center, and prevents the float 40 from being pushed up suddenly from directly below. Thereby, the liquid shut-off valve device can slide the float 40 stably even if the fuel flows into the lower chamber 11.

  Further, when fuel is supplied, the fuel flows into the lower chamber 11 also from the side surfaces in the order of the second vent hole 16 and the first vent hole 15 of the outer cylinder 12. The respective vent holes 15 and 16 are symmetric with respect to the connecting wall 19 in the lower chamber 11, and the fuel flowing in from the respective vent holes 15 and 16 is equally divided into left and right, and further bypassed laterally by the inner wall 14. Convection so that. For this reason, it is possible to prevent the fuel from flowing smoothly into the lower chamber 11 and applying a large external force to the float 40.

  When the fuel in the fuel tank 2 is nearly full, the float 40 rises on the inner wall 14 due to the buoyancy of the fuel and the bias of the spring 41. In the inner wall 14, the float 40 and the inner wall 14 are in line contact with each other via the ribs 43 and 14b, so that the frictional resistance is reduced, and the float 40 can be easily slid. Furthermore, as shown in FIG. 10C, the valve member 52 of the movable valve 50 at the upper end portion of the float 40 abuts against the opening portion 17 of the partition plate 13 in a full tank state. As a result, the opening 17 is closed, so that the evaporating gas does not flow into the upper chamber 21 from the lower chamber 11.

FIG. 11 is an enlarged side cross-sectional view showing the shut-off state of the valve means by the liquid shut-off valve device according to the present embodiment.
As shown in FIG. 11, when the opening portion 17 is blocked by the float 40, the elastic valve portion 57 of the valve member 52 is elastically bent to form a sealed state. At this time, the convex portion 46 on the upper end surface of the float 40 presses the concave portion 53 of the first floor plate 54 of the movable valve main body 51 so that the movable valve 50 is held between the float 40 and the opening 17. Here, since the convex part 46 of the float 40 has a smaller curvature of the arc surface than the concave part 53 of the movable valve main body 51, the movable valve 50 is supported in a swingable manner. Further, the urging member 47 in the movable valve main body 51 elastically urges the movable valve 50 to swing up and down. The movable valve 50 is supported in a three-dimensional manner by the contact between the concave portion 53 and the convex portion 46 and the biasing member 47 so as to be swingable in three dimensions. For example, the movable valve 50 is kept closed even when the fuel tank is tilted. It becomes easy.

  The movement allowable range S of the swing of the movable valve 50 is limited by a gap formed between the side peripheral surface of the movable valve main body 51 and the side peripheral surface of the guide wall 45 of the float 40. Further, when the opening 17 is blocked by the float 40, a clearance C for freely sliding between the float 40 and the inner wall 14 is formed. This clearance C is within a range in which the float 40 can move in the radial direction with respect to the housing 1.

FIG. 12 is a side cross-sectional view showing the operation at the time of swinging in the shut-off state of the valve means of the liquid shut-off valve device according to the present embodiment.
The fuel tank 2 may be greatly vibrated due to road surface conditions, sudden braking, or the like during driving of the automobile. At this time, the liquid shutoff valve device and the fuel also swing together with the fuel tank 2. As shown in FIG. 12, when the liquid shut-off valve device swings, the float 40 moves in the left-right direction in the inner wall 14 in the lower chamber 11 due to the clearance C between the housing 1 and the float 40. Conventionally, a gap is often generated in the opening 17 by the valve means due to the swing of the liquid shut-off valve device. In such a case, the fuel droplets are likely to be scattered from the gap between the opening 17 and the valve means, and the fuel may be blown into the upper chamber 21.

  In the liquid shut-off valve of the present embodiment, the float 40 and the movable valve 50 are separated from each other, and the radial movement allowable range S of the float 40 and the movable valve 50 is set to be larger than the clearance C in order to suppress the scattering of the fuel. It is set large (see FIG. 11). Therefore, even if the float 40 swings with respect to the clearance C, the movable valve 50 itself is prevented from swinging integrally with the float 40 because the movable valve 50 is kept within the allowable movement range S of the movable valve 50. As a result, the closed state of the movable valve 50 and the opening 17 can be maintained.

  Further, as shown in FIG. 8D, a groove portion 55 a is formed on the upper surface of the second floor plate 55 of the movable valve main body 51, and the elastic valve portion 57 of the valve member 52 is formed on the upper surface of the movable valve main body 51. The structure is not attached. By preventing the elastic valve portion 57 from adhering, even if the movable valve 50 slightly swings simultaneously with the float 40, the elastic valve portion 57 can maintain the closed state of the opening portion 17.

  Further, when the fuel tank 2 swings, a wave is generated in the stored fuel. In this case, there is a risk that a wave of fuel may enter from the first vent hole 15 or the like of the housing body 10, but by making the inner wall 14 of the housing body 10 face each other, it is possible to effectively suppress the entry of the wave.

FIG. 13 is an enlarged cross-sectional view showing the upper chamber of the liquid shut-off valve device according to this embodiment, where (a) is when the valve means is closed, and (b) is when the liquid shut-off valve device is tilted.
As shown in FIG. 13 (a), the fuel in the lower chamber 11 may be scattered as droplets when the opening 17 is closed by the rise of the float 40 or when the liquid shut-off valve device is swung. In the liquid shut-off valve device of the present embodiment, as described above, the cylindrical partition wall 18 is provided in the upper chamber 21 so as to face the opening 22a of the exhaust port. Therefore, the splash of fuel scattered from the opening 17 collides with the cylindrical partition wall 18 and is prevented from flowing into the exhaust port 22.
Further, the fuel scattered from the cylindrical partition wall 18 and the fuel flowing from the notch 18a of the partition wall 18 are separated from the opening 17 side by the flat floor surface (upper surface of the partition plate 13) in the upper chamber 21. The fuel can be returned through the notch 18a.
In addition, in this embodiment, although the upper surface of the partition plate 13 was formed flat, it is not limited to this, For example, you may form in the mortar shape that the opening part 17 becomes the lowest bottom part. If formed in this way, the fuel that has entered the upper chamber 21 can be more smoothly guided to the opening 17.

  As shown in FIG. 13B, for example, when the automobile is on a hill or the like, the liquid blocking device is also inclined at the same time. At this time, even if the fuel flows into the upper chamber 21 of the liquid shut-off valve device, the exhaust port opening 22a can store a certain amount of fuel in the upper chamber 21 as much as the exhaust port opening 22 protrudes. Is possible. The structure of the exhaust port opening 22a can more reliably prevent fuel from flowing out of the exhaust port 22. In addition, the opening of the lower chamber can be blocked by the movable valve, and the movable valve can be inclined with respect to the float from the swinging fulcrum to maintain the opening.

  When the fuel in the fuel tank 2 is used and the fuel level is reduced, the upper chamber 21 and the lower chamber 11 are unblocked. In general, fuel such as gasoline has high volatility and exhausts evaporated gas. Therefore, it is preferable that the upper chamber 21 and the lower chamber 11 are quickly disconnected. However, the valve means may continue to keep the opening 17 closed due to the influence of the internal pressure in the fuel tank 2. Therefore, it is preferable that the liquid shut-off valve device has a low restart valve pressure for releasing the blockage of the opening 17.

  In addition, when the fuel flows out from the lower chamber 11 into the fuel tank 2 due to the decrease in the fuel, the first and second hole groups 31 and 32 of the cap member 30 or the first and second passages of the outer cylinder 12 are used. Out of the pores 15 and 16. Contrary to the inflow of the fuel, the outflow of the fuel creates a convection that flows out from the outside of the center, so that the float 40 can be stably lowered. Further, the cap member 30 can be attached so that the vent hole incision 33 is shifted with respect to the housing body 10 and the second vent hole 16 is not opened. This is particularly applicable to the case where it is desired to moderate the flow of fuel from the lower chamber 11, and it is possible to provide a versatile liquid shut-off valve device.

  It should be noted that the liquid shut-off valve device of the present embodiment is not limited to the above-described embodiment, and it is needless to say that various application implementations or modification implementations are possible as necessary. For example, the cutout portion 18a provided in the cylindrical partition wall 18 is configured to be cut out in the axial direction from the upper end portion in the present embodiment, but basically only needs to be provided at a position in contact with the opening portion. The shape and size may be arbitrarily set.

It is a perspective view which shows the whole structure of the liquid cutoff valve apparatus which concerns on this embodiment. It is side surface sectional drawing which shows the state which installed the liquid cutoff valve apparatus which concerns on this embodiment in the fuel tank. It is an expanded view which shows the whole structure of the liquid cutoff valve apparatus which concerns on this embodiment, (a) is a front view, (b) is a side view, (c) is a top view, (d) is a bottom view. It is sectional drawing which shows the whole structure of the liquid cutoff valve apparatus which concerns on this embodiment, (a) is front sectional drawing, (b) is the sectional view on the AA line of FIG. 3, (c) is B-B of FIG. It is B line sectional drawing. It is a disassembled perspective view which shows the whole structure of the liquid cutoff valve apparatus which concerns on this embodiment. It is a perspective view which shows the housing main body and cap member of the liquid cutoff valve apparatus which concern on this embodiment. It is a disassembled perspective view which shows the float of the liquid cutoff valve apparatus which concerns on this embodiment. It is a figure which expands and shows the movable valve of the liquid cutoff valve apparatus which concerns on this embodiment, (a) is a side view of a valve member, (b) is side surface sectional drawing of a valve member, (c) is a side surface of a movable valve Sectional drawing and (d) are perspective views of a movable valve. It is a figure which shows the upper chamber of the liquid cutoff valve apparatus which concerns on this embodiment, (a) is a perspective view, (b) is CC sectional view taken on the line of FIG. 3, (c) is D section of FIG. FIG. It is side surface sectional drawing which shows the operation | movement at the time of fuel supply of the liquid cutoff valve apparatus which concerns on this embodiment, (a) is the state before a fuel reaches a liquid cutoff valve apparatus, (b) The fuel reached the liquid cutoff valve The initial state, (c), is the state where the fuel is full. It is the expanded side sectional view which showed the interruption | blocking state of the valve means by the liquid cutoff valve apparatus concerning this embodiment. It is an expanded side sectional view showing the operation at the time of swinging in the shut-off state of the valve means of the liquid shut-off valve device according to the present embodiment. It is an expanded sectional view which shows the upper chamber of the liquid cutoff valve apparatus which concerns on this embodiment, (a) is at the time of valve means obstruction | occlusion, (b) is at the time of inclination of a liquid cutoff valve apparatus.

Explanation of symbols

1: housing, 2: fuel tank, 3: exhaust connection passage, 4: canister, 5: gas introduction connection passage, 6: cut valve, 7: check valve,
10: housing body, 11: lower chamber, 12: outer cylinder, 13: partition plate, 13a: annular convex portion, 14: inner wall, 14a: float guide support surface, 14b: rib, 15: first vent hole, 16 : Second vent hole, 17: opening, 17a: convex portion, 18: cylindrical partition, 18a: notch, 19: connecting portion,
20: Lid head member, 21: Upper chamber, 22: Exhaust port, 22a: Opening of exhaust port, 23: Gas introduction port, 23a: Opening of gas introduction port,
30: cap member, 31: first hole group, 32: second hole group, 33: incision for vent hole, 34: valve seat,
40: float, 41: spring, 42: spring seat, 43: rib, 44: flat surface, 45: guide wall, 46: convex portion, 47: biasing member, 48: movable valve holding cap,
50: movable valve, 51: movable valve body, 52: valve member, 53: recess, 54: first floor plate, 55: second floor plate, 56: mounting hole, 57: elastic valve portion, 58: convex for mounting Part,
C: Clearance, S: Movement tolerance

Claims (3)

A liquid shut-off valve device that is provided in an upper space in a sealed container that contains a liquid, allows gas to flow into and out of the outside, and blocks leakage of the liquid from the sealed container,
A housing divided into an upper chamber and a lower chamber across a partition plate having an opening, and a float that is slidably accommodated in the lower chamber and rises by receiving buoyancy from the liquid in the sealed container,
In the upper chamber, an exhaust port communicating with the outside of the sealed container is opened,
The upper end of the float is provided with valve means for closing the opening of the partition plate as the float rises.
The valve means is provided with a movable valve that is in contact with the peripheral edge of the opening of the partition plate and is movable in a radial direction perpendicular to the center axis of the float with respect to the float. A movement allowable range is set larger than a range in which the float can move in the same direction with respect to the housing;
Furthermore, a guide wall that accommodates the movable valve inside is formed at the upper end portion of the float, and the circumferential surface of the movable valve comes into contact with the guide wall and moves in the radial direction of the movable valve. Is restricted,
And a convex part is formed in either one of the upper end surface central part of the float or the lower surface central part of the movable valve, and a concave part with which the convex part abuts is formed on the other. A liquid shut-off valve device comprising a swing fulcrum of a movable valve. The movable valve includes a movable valve main body and a valve member made of an elastic material,
The valve member has a plate-like elastic valve portion that contacts the periphery of the opening portion of the partition plate and closes the opening portion, and a mounting convex portion that is formed at a central portion of the lower surface of the elastic valve portion,
The movable valve main body includes a first floor plate in which the convex portion or the concave portion is formed on a lower surface, and a second floor plate provided above the first floor plate via a predetermined gap,
Further, the second floor plate is formed with a mounting hole penetrating both the upper and lower surfaces, and the mounting convex portion of the valve member is pushed into the mounting hole from the upper surface and fixed. 2. The liquid shut-off valve device according to claim 1, wherein a part of the mounting convex portion pushed out from the lower surface is disposed in a gap formed between the first and second floor plates. A liquid shut-off valve device that is provided in an upper space in a sealed container that contains a liquid, allows gas to flow into and out of the outside, and blocks leakage of the liquid from the sealed container,
A housing divided into an upper chamber and a lower chamber across a partition plate having an opening, and a float that is slidably accommodated in the lower chamber and rises by receiving buoyancy from the liquid in the sealed container,
In the upper chamber, an exhaust port communicating with the outside of the sealed container is opened,
The upper end of the float is provided with valve means for closing the opening of the partition plate as the float rises.
The valve means is provided with a movable valve that is in contact with the peripheral edge of the opening of the partition plate and is movable in a radial direction perpendicular to the center axis of the float with respect to the float. A movement allowable range is set larger than a range in which the float can move in the same direction with respect to the housing;
Further, the movable valve is housed inside the guide wall formed at the upper end of the float and is attached to the upper end of the float to prevent the movable valve from falling off from the upper end of the float. And having a movable valve holding cap that regulates the vertical movement range of the movable valve,
The liquid shut-off valve device, wherein the movable valve is constantly urged upward by an urging member.

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