JP2002172941A - Liquid shut-off valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid shut-off valve device for preventing excessive rising of the liquid surface in a liquid supply part, and allowing additional lubrication and good opening/closing of a float valve. SOLUTION: This shut-off valve has an umbrella valve 14 having a fin for closing a second discharge route different from a discharge route in which the float valve 7 is closed prior to the closing of the float valve 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid shut-off valve device provided with a float valve capable of discharging gas in a sealed container such as a fuel tank.

[0002]

2. Description of the Related Art A fuel vapor discharge device as a liquid shut-off valve device is a fuel vapor discharge device (hereinafter, a mixed gas of air and vaporized fuel) in a fuel tank of an automobile equipped with an engine using gasoline or light oil as fuel. Is included in the fuel vapor outflow control system for controlling the fuel vapor outflow control system.

[0003] The fuel supply section including the fuel tank and the fuel vapor outflow control system of an automobile is a critical safety component. The fuel leakage occurs during a collision, the fuel vapor generated inside the fuel tank due to the vibration caused by the running of the vehicle or the change in the environmental temperature. It is subject to safety regulations related to pressure control, etc., and laws and regulations such as pollution regulations that prevent fuel vapor from being released into the atmosphere.
From a safety point of view, it is necessary to consider various points so that fuel does not leak even when the vehicle leans or turns.

FIG. 9 is a sectional view showing a conventional fuel vapor discharge device. The fuel vapor discharge device is disposed above the fuel tank and prevents overcharging at the time of refueling.

[0005] In the figure, a fuel vapor discharge device 101 comprises:
The opening and closing state of the discharge port 103 can be controlled by closing the upper part of the float 105 with the valve seat 104 serving as a valve seat at the lower end of the discharge port 103 which opens downward and communicates with the canister. And

In FIG. 9, the float valve 102
In order to explain the operation, the float valve 102 is closed (full) on the left side of the axis A-A, and the float valve 102 is open on the right side.

The float valve 10 of the fuel vapor discharge device 101
Reference numeral 2 indicates that the float 105 floats when the liquid level rises and tilts or falls, thereby closing the valve seat 104 to close the valve, thereby preventing the fuel from leaking from the fuel tank.

[0008] The fuel vapor discharge device 101 having such a configuration is described.
By using, if it becomes full when refueling,
When the liquid level rises, the float valve 102 closes, the internal pressure of the fuel tank is temporarily increased, and the liquid level in the oil supply pipe as a liquid supply unit into which the fuel gun is inserted is raised to activate the automatic stop function of the fuel gun. Let me.

[0009]

However, in the fuel vapor discharge device 101 as described above, the float valve 102
In the valve closing operation accompanying the liquid level rise at the time of refueling in
Since the float valve 102 shifts from the open state to the closed state at once, the internal pressure of the fuel tank rapidly rises, and the liquid level in the fuel supply pipe rises excessively.

[0010] Therefore, there is a possibility that the liquid level in the fuel supply pipe temporarily approaches the fuel supply port so that the fuel leaks from the fuel supply port.

Further, when the tank is almost full at the time of refueling and the float valve 102 is once closed, the conduction path to the canister is closed, and the internal pressure of the fuel tank cannot be released, and the pressure in the refueling pipe is reduced. The liquid level is also maintained in an elevated state.

For this reason, even if the fuel tank is in a state in which refueling is possible, further refueling (additional refueling) cannot be performed.

Further, since the valve seat portion 104 is provided in a large opening from the necessity of reducing the pressure loss at the time of refueling, when the float valve 102 is closed, the float 10 is closed.
The sticking force (pressure × pressure receiving area) of No. 5 increases.

For this reason, if the sticking force of the float 105 when the valve is closed is greater than the valve opening force due to the weight of the float 105, the float 105 may stick while the valve seat 104 is closed.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to prevent the liquid level of a liquid supply unit from rising excessively,
It is an object of the present invention to provide a liquid shut-off valve device capable of replenishing and refueling, and capable of opening and closing a float valve in a favorable manner.

[0016]

According to the present invention, in order to achieve the above object, the present invention is provided on an upper portion of a sealed container for containing a liquid, and is provided in accordance with a liquid surface position of the liquid supplied into the sealed container. Liquid shutoff valve having a float valve having a float that moves and a valve that closes a discharge path for discharging gas in the sealed container when the float rises to a predetermined position in response to a rise in the liquid level. In the valve device, a second discharge path different from the first discharge path in which the float valve closes is movably connected to the float within a predetermined range, and the sealing is performed prior to closing the float valve. A floating mechanism that moves independently of the float by floating with the flow or pressure of the gas moving through the second discharge path from within the container as an urging force, the floating mechanism floating at a predetermined position It wants characterized by comprising a lifting valve for closing the the second discharge path.

Therefore, when the liquid level in the sealed container rises above a predetermined height, the float valve closes. However, the floating valve closes the second discharge path prior to closing the float valve, The discharge of gas from inside the sealed container becomes only the first discharge path where the float valve is opened, and the discharge flow rate of gas can be reduced. Before the float valve closes, the pressure inside the sealed container is gradually reduced. This makes it possible to suppress a sudden pressure change and excessive pressure due to the float valve closing at once.

As described above, by reducing the pressure change gradient inside the sealed container, the rise in the liquid level of the liquid supply unit (oil supply pipe) provided in the sealed container can be reduced. To prevent the liquid level from rising excessively.

In addition, as the pressure inside the sealed container rises due to the closing of the lift valve, the liquid supply unit (oil supply pipe) becomes so large that the automatic stop function of the liquid supply means (oil supply gun) operates.
Even if the liquid level of the liquid rises, once the refueling is stopped, the discharge of the fuel vapor gradually stops, so the lift valve also opens again, the pressure inside the sealed container decreases, and the liquid supply section (refueling pipe) ), The liquid level drops, so that the liquid can be supplied and filled up to the maximum allowable amount of the sealed container in which the float valve closes (filling and refueling).

Further, the gas is discharged from the sealed container during the liquid supply through the first discharge path in which the float valve is open and the second discharge path in which the floating valve is open. It is not necessary to provide only a large opening in the valve seat of the float valve in order to reduce the pressure loss at the time of opening. Therefore, the opening in the valve seat of the float valve is reduced to reduce the sticking force of the float when closing (pressure × pressure receiving area). The size of the float valve can be reduced, the float valve can be reliably opened by its own weight, and the float valve can be properly opened and closed.

Here, there is no connecting means or elastic biasing means such as a spring between the floating mechanism and the float, and the floating mechanism moves independently of the float, so that the floating mechanism is operated by the movement of the gas. Since the pressure (suction pressure) is suppressed from being transmitted to the float, it may affect the behavior of the float in an unstable state (a state that the valve is closed by a slight trigger) near the closing of the float valve. Suppressed, it is possible to suppress a sudden pressure change and excessive pressure due to the float valve closing at once.

Further, the lifting mechanism is movably connected to the float, so that even when a closed lifting valve is stuck, the float is forced by its own weight due to the drop of the float due to a decrease in the liquid level. Can be pulled back.

It is preferable that the lifting mechanism is connected to the float outside the outer periphery of the float.

Thus, even if a structure for connecting the floating mechanism to the float is formed in the float, the underfill, crack or crack due to insufficient filling of the molding material at the time of molding is less likely to occur, and high precision and high quality can be achieved. Floats can be created.

It is preferable that the lifting mechanism includes a valve body for absorbing the pressing of the float when the float valve is closed.

Thus, when the float valve closes after the lift valve closes before the float valve closes,
When the lifting mechanism is pressed further upward by the float, the valve element of the lifting mechanism absorbs the pressing of the float and the lifting valve can be properly closed.

For this reason, when the assembly of the apparatus is completed, at the closing position of the floating valve which is closed prior to closing of the float valve, the floating mechanism is further pushed upward by the float when the float valve is closed. The device can operate satisfactorily even if there are various correlations.

Therefore, the tolerance of the error when the assembly of the apparatus is completed is increased, so that the precision of the components of the float and the lifting mechanism is not so required at the time of manufacture, and the production can be easily performed.

The opening of the valve seat that the float valve closes is
It is preferable that the floating valve is smaller than the opening of the valve seat that closes.

Thus, the float sticking force (pressure × pressure receiving area) when the valve is closed can be reduced, the float valve can be reliably opened by its own weight, and the float valve can be properly opened and closed.

[0031] It is preferable that the lifting mechanism includes a horizontal blade portion that receives, as an urging force, a flow or pressure of a gas moving through the second discharge path from inside the sealed container.

Thus, the floating mechanism is easily lifted by using the flow or pressure of the gas moving through the second discharge path as an urging force, and the floating valve is reliably closed prior to closing the float valve.

Further, by changing the height position at which the horizontal blade portion is arranged, it is possible to adjust the time at which the lifting mechanism is lifted (the higher the higher, the higher the lifting speed).

The lifting mechanism includes a pressure receiving portion that receives, as an urging force, the flow or pressure of the gas moving from the inside of the sealed container through the second discharge path, a lower surface of the pressure receiving portion that protrudes upward from the pressure receiving portion and is recessed downward. And a guide member provided on the upper surface of the pressure receiving portion and sliding with the inner wall of the device as a guide surface, and a connection mechanism for connecting the floating mechanism and the float is provided inside the recess. It is preferable to have a stopper provided, and a projection extending upward from the float having a top portion which is retained in the recess by the stopper.

As a result, the recess of the lifting mechanism is recessed downward, and the lifting mechanism expands the pressure receiving area for receiving the flow of gas or the urging force of the pressure inside the recess.
The lifting mechanism is easily moved by receiving the urging force. In addition, since the liquid does not stay in the concave portion and there is no change in the weight of the lifting mechanism, the response characteristics of the lifting mechanism that moves by the urging force are stably maintained. Further, the recess is sealed except for the opening, so that there is no gas leakage and the valve can be closed satisfactorily.

Further, the lifting mechanism is movably supported by the guide member, so that the posture during the movement is stabilized, and the lifting mechanism can be operated more stably.

Further, since the connection mechanism is provided in the downwardly concave recess of the lifting mechanism, the connection mechanism does not come into contact with the liquid, so that dust and the like contained in the liquid can be prevented from adhering to the connection mechanism. The lifting mechanism can smoothly move independently of the float via the connection mechanism.

The connecting mechanism allows the lifting mechanism to move up and down within a predetermined range independently of the float.

[0039]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The materials, shapes, relative arrangements, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

A fuel vapor discharge device as a liquid shut-off valve device according to the embodiment will be described below. The fuel vapor discharge device is provided in a fuel vapor outflow control system similar to the conventional one. The fuel vapor outflow control system has been described in the prior art, and will not be described here.

FIGS. 1 to 4 are views for explaining the configuration of the fuel vapor discharge device according to the embodiment. FIG. 5 is a view for explaining a main part of the fuel vapor discharge device according to the embodiment of FIG.

The fuel vapor discharge device 1 is surrounded by a case member 2. A lower part of the inside of the case member 2 is a float chamber 4 for housing the float 3.

The float 3 has a buoyancy due to fuel as a liquid flowing into the inside of the float chamber 4 from the communication hole 5a of the cap 5 attached to the lower end of the case member 2 (and the vent hole 2a at the upper part of the float chamber 4). Occurs and moves upward in the figure.

The upper part of the float 3 is provided with a projection 3a as a valve body of the float valve at the center.

On the other hand, the partition wall 6, which is the upper wall of the float chamber 4, is provided with an annular valve seat portion 6a as a float valve seat corresponding to the projection 3a of the float 3.

As described above, the projection 3a and the valve seat portion 6
a constitutes an on-off valve, and the on-off valve and the float 3 together constitute a float valve 7.

Here, in the present embodiment, the projection 3a and the valve seat portion 6a are provided along the central axis of the float 3. For this reason, the structure of the float valve 7 is simplified, and the valve can be closed satisfactorily.

Further, a spring 8 is provided in the float 3 and functions as a biasing means for adjusting the buoyancy of the float 3. The spring 8 always urges the float 3 with a load smaller than the weight of the float 3, but does not close the float valve 7 by pushing up the float 3 unless the buoyancy is exerted at the time of erecting.

Further, on the upper part of the float 3, there is provided a second projection 3b which protrudes outside the outer periphery of the float 3 main body and protrudes upward.

The second projection 3b has a top 3b1 and a large diameter portion 3b3 at the root that are larger in diameter than the intermediate small diameter portion 3b2 (see FIG. 5 for details).

The float 3 provided with the protrusions 3a and the second protrusions 3b separates the protrusions 3a and the second protrusions 3b, and in particular, connects the second protrusions 3b (structure for connecting the fin-mounted umbrella mechanism 9). Since it is provided outside the outer periphery of the float 3, molding distortion is suppressed, and underfilling, cracking or cracking due to insufficient filling of the molding material at the time of molding is less likely to occur, and a high-quality float 3 with high accuracy is produced. Can be. Therefore,
The protrusion 3a and the second protrusion 3b can also be formed with high accuracy.

In the present embodiment, the second protrusion 3b is provided outside the outer periphery of the float 3, but the present invention is not limited to such a case due to the device configuration.

Then, the second projection 3b of the float 3
A finned umbrella mechanism 9 as a lifting mechanism is connected.

The finned umbrella mechanism 9 is provided on the upper surface of the flow rate regulating portion 10 which spreads like a flange serving as a pressure receiving portion and which slides on the inner wall of the cylindrical portion 6 b provided on the partition wall 6. Fins 11 (four in the present embodiment) serving as guide members, and a cylindrical shape protruding downward from the upper surface of the flow rate regulating portion 10 so as to retain and accommodate the second protrusions 3b formed on the float 3. A concave portion 12 is formed on the lower surface of the flow regulating portion 10, and a packing 13 is provided on the flow regulating portion 10 as a valve body of the finned umbrella valve.

The flow restricting portion 10 has a disk shape, and the lower surface is a tapered surface inclined downward by about 10 degrees from the outside toward the center, and is provided on the upper peripheral wall surface of the float chamber 4. It receives a flow and a pressure when the fuel vapor passes from the pores 2a toward the cylindrical portion 6b as an urging force, and moves upward when the urging force exceeds the weight of the finned umbrella mechanism 9.

The fin 11 has a length which is guided by sliding on the inner wall of the cylindrical portion 6b even when the float 3 is located at the lowermost position. In order to smoothly discharge the steam, it is provided with dimensions suitable for reducing the weight and preventing sticking while securing rigidity. The shape of the fin 11 is not limited to a trapezoid as in the present embodiment, as long as it can slide on the inner wall of the cylindrical portion 6b. The number of sheets can be appropriately changed.

The outer edge of the flow restricting portion 10 protrudes outward from the fins 11 (plurality), and when the flow restricting portion 10 moves upward to the lower end 6c of the cylindrical portion 6b as a valve seat of the floating valve. The gasket 13 provided on the upper surface of the flow rate regulating section 10 contacts the flow control section 10.

As described above, the packing 13 on the flow rate regulating portion 10 and the lower end 6c of the cylindrical portion 6b constitute an opening / closing valve of a lift valve, and this is combined with the finned umbrella mechanism 9 to provide a fin as a lift valve. An umbrella valve 14 is configured.

The opening at the lower end 6c of the cylindrical portion 6b is provided to be larger than the opening at the valve seat 6a.

The concave portion 12 is provided at the center of the upper part of the flow regulating portion 10, and the second protrusion 3b of the float 3 is inserted therein. As shown in FIG. 5, the diameter of the opening 12a of the recess 12 is smaller than the inner diameter of the recess 12 and serves as a stopper for holding the top 3b1 of the second projection 3b in the recess 12. Of the second protrusion 3
The range of the small diameter portion 3b2 of b can be moved.

For this reason, the concave portion 12 has a predetermined (vertical)
With being movable within the range, the finned umbrella mechanism 9 is connected to the float 3 so as to be movable within a predetermined (up-down direction) range. That is, the concave portion 12 and the second protrusion 3b constitute a connection mechanism 15 that movably connects the finned umbrella mechanism 9 to the float 3.

The connecting mechanism 15 itself has
The connection mechanism 15 does not come into contact with the fuel, so that dust and the like contained in the fuel can be prevented from adhering to the connection mechanism 15. The movement independent of the float 3 can always be performed smoothly.

By the way, only the valve seat 6a and the cylinder 6b are provided on the partition wall 6 of the case member 2, and if the valve 6 does not pass through the valve seat 6a or the cylinder 6b, the upper chamber of the float chamber 4 will be closed. The room 16 cannot be accessed.

That is, by using the valve seat portion 6a and the cylinder portion 6b, the discharge path becomes two parallel routes (the valve seat portion 6a and the cylinder portion 6b) branched from the float chamber 4 and joined again in the chamber chamber 16. It is supposed to. In the present embodiment, the valve seat portion 6a side is a first discharge route, and the cylinder portion 6b side is a second discharge route.

The chamber 16 is provided above the float chamber 4 and is divided into a predetermined space by the case member 2, the partition wall 6, and the upper cap 17.

In the chamber 16, the cylindrical portion 6 b is formed to extend vertically upward to approach the upper cap 17. Therefore, when fuel enters the cylinder 6b when the fuel tank is inclined or the like, a certain amount of fuel is retained in the cylinder 6b to prevent the fuel from entering the chamber 16 and flowing out to the discharge path. are doing.

In the chamber 16, a discharge port 18 (conductive to the canister) is provided so as to open to the side wall of the case member 2.

The fuel vapor discharge device 1 as described above is interposed in the discharge path for discharging the fuel vapor from the fuel tank, and plays the role of discharging the fuel vapor in the fuel tank at the time of refueling or the like.

That is, when the float 3 is located below without receiving the buoyancy of the fuel, and when the internal pressure of the fuel tank rises at the time of refueling or the like, the fuel vapor is supplied to the float valve 7 and the fins in the open state. Through the umbrella valve 14, that is, passing through the valve seat portion 6a and the cylindrical portion 6b, it flows into the chamber 16 and can flow out of the chamber 16 to the discharge port 18.

Next, the operation of the fuel vapor discharge device 1 during refueling will be described.

FIG. 1 shows the initial stage of refueling (when the liquid level is still lower than the position where the fuel vapor discharge device 1 is provided), and the float 3 is located below the float chamber 4 because the liquid level is low. ing. In addition, the finned umbrella mechanism 9 does not operate, and is supported by the large diameter portion 3b3 at the base below the small diameter portion 3b2 of the second protrusion 3b of the float 3 and moves integrally with the float 3. In the state of FIG. 1, the valve seat portion 6a
In addition, a sufficiently open flow path in which both the cylinder portion 6b and the cylinder portion 6b do not interfere with the refueling property is secured, and the pressure loss in the fuel tank is reduced to quickly discharge the fuel vapor.

FIG. 2 shows a state in which the refueling progresses, the liquid level A becomes nearly full, the float 3 obtains buoyancy, and the float valve 7 is almost closed. With the rise of the float 3, the finned umbrella mechanism 9 also rises and approaches the lower end 6c of the cylindrical portion 6b.

FIG. 3 shows a state in which the liquid level B is changed from the state shown in FIG. 2 and the flow of the fuel vapor discharged from the cylindrical portion 6b (ie, the second exhaust path) and the fuel vapor entering the lower surface of the flow rate regulating portion 10. The flow regulating section 10 receives the urging force due to the pressure difference generated in the fin, and the finned umbrella mechanism 9 moves in the fuel vapor discharging direction (FIG.
(Upward in FIG. 3), the flow regulating portion 10 has moved, and the packing 13 is in contact with the lower end portion 6c of the cylindrical portion 6b.

When the finned umbrella mechanism 9 is moved,
Since the fins 11 slide along the inner wall of the cylindrical portion 6b, the finned umbrella mechanism 9 is held in a posture and does not tilt. After the packing 13 contacts the lower end portion 6c of the cylindrical portion 6b, the fuel vapor flows through the valve seat portion 6a, so that the discharge of the fuel vapor is reduced as compared with the state shown in FIG.

As described above, when the finned umbrella mechanism 9 moves and the finned umbrella valve 14 closes, the valve seat portion 6a
Exhaust is performed only in the middle (that is, the first exhaust path), and the amount of discharged fuel vapor is reduced.

Then, by performing the throttling, it is possible to gradually increase the pressure inside the fuel tank before the float valve 7 is closed, and a sudden change in pressure due to the sudden closing of the float valve 7 and excessive pressure Pressure can be suppressed.

As described above, by making the pressure change gradient inside the fuel tank gentle, it is possible to moderate the rise in the liquid level of the oil supply pipe provided in the fuel tank, and the liquid level of the oil supply pipe becomes excessive. Prevent it from rising. Therefore, there is no possibility that the liquid level in the fuel supply pipe temporarily approaches the fuel supply port too much and the fuel leaks from the fuel supply port.

Since the finned umbrella mechanism 9 moves independently of the float 3, the pressure (suction pressure) applied to the finned umbrella mechanism 9 due to the discharge of fuel vapor is suppressed from being transmitted to the float 3. Can be

For this reason, it is possible to suppress the influence on the behavior of the float 3 in an unstable state (a state in which the float valve 7 is closed by a slight trigger) near the closing time of the float valve 7, and to close the float valve 7 at once. Abrupt pressure change and excessive pressure can be suppressed.

Then, the pressure inside the fuel tank rises,
Once the automatic refueling gun is operated and the refueling is stopped, the discharge of the fuel vapor gradually stops, so that the urging force on the lower end 6c of the cylindrical portion 6b of the finned umbrella mechanism 9 is also eliminated, and the finned umbrella mechanism is stopped. 9 returns to a state in which the cylinder 6b is opened by dropping.

In the state shown in FIG. 3, the discharge of the fuel vapor accompanying the supply of the fuel can be performed at a reduced discharge flow rate, and it is possible to perform replenishment and refueling.

If the refueling speed is increased in the refilling refueling, the finned umbrella mechanism 9 reacts and the pressure inside the fuel tank rises immediately, and the auto stop of the refueling gun also functions. When the fuel is supplied one by one, the reaction of the finned umbrella mechanism 9 becomes slow.

FIG. 4 is a view showing the state of the float valve 7 and the finned umbrella valve 14 which have reached the liquid level C and have been completely closed. When the refilling is continued from the state of FIG. Thus, the float valve 7 and the finned umbrella valve 14 are completely closed. In other words, replenishment can be performed up to the maximum allowable amount of the fuel tank in which the float valve 7 is closed.

When fuel is consumed from the full state in FIG. 4 and the liquid level is lowered, the float 3 floating on the liquid level due to buoyancy naturally drops. At this time, since the opening of the valve seat portion 6a is small, the sticking force (pressure × pressure receiving area) of the float 3 when the valve is closed can be reduced, and the float valve 7 can be reliably opened by its own weight of the float 3. The float valve 7 can be opened and closed favorably. Therefore, the float 3 does not adhere to the valve seat 6a while blocking it.

When the float valve 7 is opened, the inside of the fuel tank and the inside of the chamber 16 become the same pressure, the finned umbrella mechanism 9 drops from the lower end 6c of the cylindrical portion 6b, and the finned umbrella valve 14 is also opened. Give a valve.

In some cases, the finned umbrella mechanism 9 sticks to the lower end 6c of the cylindrical portion 6b, but the top 3b1 of the second projection 3b that stays in the recess 12 when the float 3 falls falls on the opening 12a of the recess 12. The umbrella mechanism 9 with fins is dropped by the weight of the float 3 by the stopper of the float 3 and the sticking is eliminated.

Note that the finned umbrella mechanism 9 in which the packing 13 in FIG. 3 contacts the lower end 6c of the cylindrical portion 6b is further pushed upward by the float 3 when the float valve 7 in FIG. 4 is closed. In such a case, poor sealing of the finned umbrella valve 14 may occur.

Therefore, as shown in FIG. 6, even if such a mutual relationship occurs, the structure may be such that the pressing of the float 3 is absorbed.

FIG. 6 shows a structure in which a gap S is provided between the upper surface of the flow regulating portion 10 and the back of the packing 13 abutting on the lower end portion 6c of the cylindrical portion 6b. In FIG. 6A, packing 1 is used.
3 is separated from the upper surface of the flow regulating unit 10, and in FIG.
0 The shape is separated from the upper surface.

As shown on the right side of FIGS. 6 (a) and 6 (b), the deformation of the packing 13 for crushing the gap S is allowed, and the pressing of the float 3 is allowed to move the packing 13 to the lower end of the cylindrical portion 6b. It surely contacts the part 6c. Thereby, the finned umbrella valve 14 can be properly closed.

For this reason, even when such a mutual relationship occurs when the assembly of the fuel vapor discharge device 1 is completed, the fuel vapor discharge device 1 can operate well by adopting the configuration as shown in FIG. it can.

Therefore, the tolerance of the error when the assembly of the fuel vapor discharge device 1 is completed is increased, so that the float 3 and the components of the finned umbrella mechanism 9 are not required to have much accuracy when they are manufactured, and can be easily manufactured.

The finned umbrella mechanism 9 is provided with a float valve 7.
It is necessary to float up and close the finned umbrella valve 14 surely prior to the closing of the valve. Therefore, as shown in FIG. 7, the finned umbrella mechanism 9 may be provided with a horizontal blade portion 19.

The horizontal blade portion 19 receives, as the urging force, the flow and the pressure when the fuel vapor passes toward the cylindrical portion 6b, similarly to the flow regulating portion 10.

The operation of the horizontal blade 19 will be described with reference to FIG.

FIG. 8 (a) shows that the cylinder 6
This is a state where a sufficient flow path to b is formed.

FIG. 8 (b) shows a state in which the liquid level rises and the position of the float 3 rises, so that the finned umbrella mechanism 9 also rises and approaches the lower end 6c of the cylindrical portion 6b. At this time, the flow path to the cylindrical portion 6b is narrowed, and the flow is generated by the flow of the fuel vapor discharged through the cylindrical portion 6b (that is, the second exhaust path) and the fuel vapor entering the lower surface of the horizontal blade portion 19. Due to the differential pressure, the horizontal blade 1 together with the flow regulating unit 10
9 receives the urging force, and the finned umbrella mechanism 9 is easily lifted.

FIG. 8 (c) shows a state in which the finned umbrella mechanism 9 has moved and the packing 13 has contacted the lower end 6c of the cylindrical portion 6b.

As described above, the fin-mounted umbrella mechanism 9 is easily lifted by using the flow or pressure of the fuel vapor moving through the cylindrical portion 6b as an urging force, and the fin-mounted umbrella valve is surely preceded before the float valve 7 is closed. 14 is closed.

Further, by changing the height position at which the horizontal blade portion 19 is arranged, the time at which the fin-mounted umbrella mechanism 9 rises can be adjusted (the higher the higher, the more the fin-mounted umbrella mechanism 9 rises). In the past, such an adjustment had to be adjusted by newly constructing the float 3 and the case member 2, but this is no longer necessary.
Adjustment can be easily performed.

[0101]

According to the present invention described above, the second discharge path different from the first discharge path in which the float valve closes is provided.
On the discharge path, the float is movably connected within a predetermined range with respect to the float, and floats as a biasing force on the flow or pressure of gas moving through the second discharge path from within the sealed container prior to closing the float valve, Having a lifting mechanism that moves independently of the float, and having a lifting valve that closes the second discharge path when the lifting mechanism rises to a predetermined position, the liquid level in the sealed container is equal to or higher than a predetermined height. When the float valve is closed, the float valve closes. However, the floating valve closes the second discharge path prior to closing the float valve, and discharge of gas from inside the sealed container opens the float valve. Only the first discharge path can reduce the discharge flow rate of gas, and it is possible to gradually increase the pressure in the sealed container before closing the float valve, so that the float valve closes at once. Rapid pressure variation and excessive pressure can be suppressed that.

As described above, by reducing the pressure change gradient inside the sealed container, the rise in the liquid level of the liquid supply unit (oil supply pipe) provided in the sealed container can be reduced. To prevent the liquid level from rising excessively.

Further, as the pressure inside the sealed container rises due to the closing of the lift valve, the liquid supply unit (oil supply pipe) becomes so large that the automatic stop function of the liquid supply means (oil supply gun) operates.
Even if the liquid level of the liquid rises, once the refueling is stopped, the discharge of the fuel vapor gradually stops, so the lift valve also opens again, the pressure inside the sealed container decreases, and the liquid supply section (refueling pipe) ), The liquid level drops, so that the liquid can be supplied and filled up to the maximum allowable amount of the sealed container in which the float valve closes (filling and refueling).

Further, since the gas is discharged from the sealed container at the time of liquid supply through the second discharge path in which the floating valve is largely opened, the opening of the valve seat of the float valve is reduced to close the valve. Sticking force of float (pressure x pressure receiving area)
Can be reduced, the float valve can be reliably opened by its own weight, and the float valve can be opened and closed favorably.

Since the floating mechanism is connected to the float outside the outer periphery of the float, even if a structure for connecting the floating mechanism to the float is formed on the float, it is caused by insufficient filling of the molding material during molding. It is possible to produce a high-precision, high-quality float that is unlikely to cause underfill, cracks, or cracks.

The lifting mechanism has a valve body for absorbing the pressing of the float when the float valve is closed, so that when the float valve closes after the float valve closes before the float valve closes, When the lifting mechanism is pressed further upward by the float, the valve element of the lifting mechanism absorbs the pressing of the float and the lifting valve can be properly closed.

For this reason, when the assembly of the apparatus is completed, when the float valve is closed, the float mechanism is further pushed upward by the float when the float valve is closed. The device can operate satisfactorily even if there are various correlations.

[0108] Therefore, the tolerance of the error at the time of completing the assembly of the device is increased, so that the precision of the components of the float and the lifting mechanism is not so required at the time of manufacturing, and the device can be easily manufactured.

The opening of the valve seat where the float valve closes is smaller than the opening of the valve seat where the lift valve closes, so that the sticking force of the float when closing the valve (pressure × pressure receiving area) can be reduced. The valve can be reliably opened by its own weight, and the float valve can be opened and closed favorably.

The lifting mechanism has a horizontal blade portion which receives the flow or pressure of the gas moving from the inside of the sealed container through the second discharge path as an urging force, thereby reducing the flow or pressure of the gas moving through the second discharge path. As the urging force, the lifting mechanism is easily lifted, and the lifting valve is reliably closed prior to closing the float valve.

Further, by changing the height position at which the horizontal blade portion is arranged, it is possible to adjust the time at which the lifting mechanism rises (the higher the higher the height, the higher the lifting).

The lifting mechanism includes a pressure-receiving portion for receiving the flow or pressure of the gas moving from the inside of the sealed container through the second discharge path as an urging force, and a concave portion projecting upward from the pressure-receiving portion and recessed downward to open on the lower surface of the pressure-receiving portion. A guide member provided on the upper surface of the pressure receiving portion and sliding with the inner wall of the device as a guide surface;
The connecting mechanism for connecting the floating mechanism and the float includes a stopper provided inside the concave portion, and a protrusion extending upward from the float having a top portion that is held in the concave portion by the stopper, thereby raising the floating portion. The concave portion of the mechanism is concave downward, and the lifting mechanism expands the pressure receiving area for receiving the urging force of the gas flow or the pressure inside the concave portion, so that the lifting mechanism is easily moved by receiving the urging force. In addition, since the liquid does not stay in the concave portion and there is no change in the weight of the lifting mechanism, the response characteristics of the lifting mechanism that moves by the urging force are stably maintained. Further, the recess is sealed except for the opening, so that there is no gas leakage and the valve can be closed satisfactorily.

Further, the lifting mechanism is movably supported by the guide member, so that the posture during the movement is stabilized, and the lifting mechanism can be operated more stably.

Further, since the connection mechanism is provided in the downwardly concave recess of the lifting mechanism, the connection mechanism does not come into contact with the liquid, so that dust and the like contained in the liquid can be prevented from adhering to the connection mechanism. The lifting mechanism can smoothly move independently of the float via the connection mechanism.

Then, the lifting mechanism can be moved up and down independently of the float within a predetermined range by the connection mechanism.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a fuel vapor discharge device according to an embodiment.

FIG. 2 is a schematic sectional view showing a fuel vapor discharge device according to the embodiment.

FIG. 3 is a schematic sectional view showing a fuel vapor discharge device according to the embodiment.

FIG. 4 is a schematic sectional view showing a fuel vapor discharge device according to the embodiment.

FIG. 5 is an enlarged sectional view showing a main part of the fuel vapor discharge device according to the embodiment.

FIG. 6 is an enlarged sectional view showing packing of a finned umbrella valve according to another example of the embodiment.

FIG. 7 is a diagram showing a finned umbrella valve according to another example of the embodiment.

FIG. 8 is an explanatory view showing an operation of a finned umbrella valve according to another example of the embodiment.

FIG. 9 is a schematic sectional view showing a conventional fuel vapor discharge device.

[Explanation of symbols]

 Reference Signs List 1 fuel vapor discharge device 2 case member 2a ventilation hole 2b projection 3 float 3a projection 3b second projection 3b1 top part 3b2 small diameter part 3b3 large diameter part 4 float chamber 5 cap 5a communication hole 6 partition wall 6a valve seat part 6b cylindrical part 6c lower end Part 7 float valve 8 spring 9 umbrella mechanism 10 flow regulating part 11 fin 12 recess 12a opening 13 packing 14 umbrella valve 15 connection mechanism 16 chamber chamber 17 upper cap 18 discharge port 19 horizontal blade part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16K 31/18 B60K 15/02 G F-term (Reference) 3D038 CA15 CA23 CB01 CC03 3G044 BA30 CA17 DA03 EA05 FA23 GA03 GA08 GA23 3H055 AA02 AA11 AA22 BA12 CC04 CC17 CC20 CC21 CC25 GG02 GG26 GG40 HH05 JJ03 3H068 AA01 BB12 BB66 BB74 BB90 CC02 DD05 DD12 EE01 FF07 GG07 GG11

Claims (6)

[Claims] 1. A float provided on an upper portion of a sealed container for storing a liquid, the float being moved in accordance with a liquid surface position of a liquid supplied in the sealed container, and the float being provided in accordance with a rise in the liquid surface position. An on-off valve that closes a discharge path that discharges the gas in the sealed container when raised to a position, wherein the liquid discharge valve device includes a float valve having a float valve that is different from the first discharge path that the float valve closes. Second
On the discharge path, the float is movably connected to the float within a predetermined range, and floats as a biasing force with the flow or pressure of the gas moving through the second discharge path from within the sealed container prior to closing the float valve. A liquid shut-off valve device comprising: a lifting mechanism that moves independently of the float; and a lifting valve that closes a second discharge path when the lifting mechanism rises to a predetermined position. 2. The liquid shut-off valve device according to claim 1, wherein the lifting mechanism is connected to the float outside the outer periphery of the float. 3. The liquid shut-off valve device according to claim 1, wherein the lifting mechanism includes a valve element that absorbs pressing of the float when the float valve is closed. 4. An opening of a valve seat that the float valve closes,
4. The liquid shut-off valve device according to claim 1, wherein the lift valve is smaller than an opening of a valve seat that closes. 5. The lifting mechanism according to claim 1, wherein the lifting mechanism includes a horizontal blade portion for receiving a flow or pressure of a gas moving through the second discharge path from inside the sealed container as an urging force. The liquid shutoff valve device according to any one of the above. 6. A pressure receiving portion for receiving, as an urging force, a flow or pressure of a gas moving through a second discharge path from inside the sealed container, and the pressure receiving portion protruding upward from the pressure receiving portion and being recessed downward. And a guide member provided on the upper surface of the pressure receiving portion and sliding on the inner wall of the apparatus as a guide surface, and a connection mechanism for connecting the floating mechanism and the float includes the concave portion. 6. The device according to claim 1, further comprising: a stopper provided on an inner side, and a protrusion extending upward from the float having a top portion fixed in the recess by the stopper. Liquid shutoff valve device.