JPH11257527A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the ease of valve opening and a large opening amount of a valve simultaneously. SOLUTION: In a valve davice employed by a pump housed in an oil feeding device feeding fuel oil to an automobile and the like, the valve device is formed out of a valve seat 26 provided for the upper end of an outflow pipe 29, a guide 28 fixed to the outflow pipe 29, and of a valve element 25 in which a valve 21 brought into contact with the valve body 26 is provided at one end, and a shaft 23 to be guided by a guide 28 to the intermediate part of an arm 24 is provided with a float 22 at the other end, and the shaft 23 abuts against the upper end of the guide 28 under a condition that the valve 21 is brought into contact closely with the valve seat 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device used for a pump housed in a fueling device installed in a gas station.

[0002]

2. Description of the Related Art In a refueling system of a gas station, oil liquid pumped by a pump is supplied to a fuel tank of an automobile. However, a small amount of air is mixed in the oil liquid. As shown in FIG. 1, a gas-liquid separation chamber 6 is provided on the discharge side of the pump, and an oil liquid containing a relatively large amount of air is separated into air and a liquid containing air in the gas-liquid separation chamber 6. The air flows into the float chamber 10 through the flow path 14 by the valve device 15 for air outflow, is discharged to the atmosphere from the air vent 12, and the liquid is returned to the pump P again.

[0003]

When the oil liquid in the underground tank is emptied or the piping is damaged, a large amount of air flows into the gas-liquid separation chamber 6 at a time, and a large amount of air is discharged. The inside of the gas-liquid separation chamber 6 is filled. As a result, air leaks to the discharge port O, and the flow meter connected to the discharge port O measures the air. In order to prevent an error in the measurement of the refueling amount, the gas-liquid separation chamber 6 is used. A flow passage 14 for releasing air is provided therein, and a valve device 15 for outflow of air is provided in the flow passage 14. However, the pressure in the gas-liquid separation chamber 6 is higher than the pressure in the float chamber 10 communicating with the atmosphere, so that the valve is pressed against the valve seat and it is difficult to open the valve.

[0004] The present invention has been made in view of such a problem, and an object of the present invention is to provide a valve device capable of simultaneously obtaining easy valve opening and a large valve opening.

[0005]

According to the present invention, there is provided a valve device for use in a pump housed in a fuel supply device for supplying fuel oil to an automobile or the like. A provided valve seat, a guide fixed to the outflow pipe, a valve close to the valve seat provided at one end, and a shaft guided by the guide provided at an intermediate portion of an arm provided with a float at the other end. The shaft is in contact with the upper end of the guide when the valve is in close contact with the valve seat.

Therefore, according to the present invention, when the valve is opened, the fulcrum is located near the valve to facilitate the valve opening, and as the valve opening progresses, the fulcrum is moved to a position away from the valve to obtain a large valve opening. be able to. In addition, since it is composed of two parts, the outflow pipe and the valve element, the number of assembly steps can be reduced.

Further, since the guide has an arc shape centered on the guide side of the contact portion between the valve seat and the valve, the valve can be opened and closed smoothly.

Further, since the valve has a hemispherical shape, it can be easily seated on the valve seat, the requirement for dimensional accuracy is small, and the variation in product accuracy is reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view of a pump device to which the valve device of the present invention is applied, FIG. 2 is a partially enlarged sectional view showing a valve device for air outflow, and FIG. 3 is a partially enlarged plan view showing a valve device for air outflow. FIG. 4 is a partially enlarged sectional view showing a valve device for air outflow when the valve is opened, and FIG. 5 is a partially enlarged sectional view showing a valve device for liquid outflow showing a second embodiment.

As shown in FIG. 1, the pump device 1 includes a casing C, and the casing C is provided with an inlet I at a lower portion and an outlet O at an upper portion. A suction strainer 2 and a check valve 3 are provided at the inner end of the inflow port I, and a pump P is provided at substantially the center of the casing C. The pump P has a suction port 4 and a discharge port 5, and the discharge port 5 of the pump P communicates with the gas-liquid separation chamber 6. This gas-liquid separation chamber 6
The liquid containing no air is formed to be guided to the outlet O through the discharge strainer 7 on the discharge side and the control valve 8.

On the other hand, at the inlet 9 of the gas-liquid separation chamber 6, a liquid passage 11 through which a liquid containing much air flows out to the float chamber 10.
The float chamber 10 is provided with an air vent 12 for discharging the air flowing through the liquid passage 11 to the atmosphere and a liquid outlet valve device 13 for returning the liquid from which the air has been separated to the inflow side. In addition, a valve device 15 for air outflow of the present invention is provided at the upper portion of the gas-liquid separation chamber 6 for allowing air to flow into the float chamber 10 through the flow path 14 when a large amount of air flows in. .

2 and 3, the main part of the present invention will be described. First, a hemispherical valve 21 is connected to one end, a float 22 which swings by the liquid level is connected to the other end, and a valve body 25 composed of an arm 24 having a shaft 23 in the middle, and a valve seat 26 receiving the valve 21 at the upper end. A support 27 is formed near the valve seat 26.
And an outflow pipe 29 in which a guide 28 movably guiding the shaft 23 provided on the arm 24 is formed on the support 27. The outflow pipe 29 is inserted into the flow path 14. A step 30 is formed in the outflow pipe 29 to prevent the outflow pipe 29 from falling out of the flow path 14. Guide 28
Represents an arc centered on the guide 28 side of the contact portion between the valve 21 and the valve seat 26 so that the valve 21 can be automatically aligned with the valve seat 26.

A projection 32 is formed on the guide 28 side of the valve seat 26 and at a distance from the valve seat 26. The projection 32 contacts the end 31 of the arm 24.
The slope is formed so as to become lower toward the side. The convex portion 32 forms a corner portion 32a with which the end portion 31 contacts, and a corner portion 32b with which the back surface of the arm 24 contacts. Further, the end portion 33 on the guide 28 side is formed so as to contact the back surface of the arm 24. Normally, the float 22 floats due to the buoyancy of the oil and the valve 21 is closed.

Next, the operation will be described. For example, when the oil liquid in the underground tank becomes empty or the pipe is broken, a large amount of air flows into the gas-liquid separation chamber 6, and the oil liquid in the gas-liquid separation chamber 6 flows out to remove the air. This fills the gas-liquid separation chamber 6. When the float 22 is lowered by its own weight, the contact between the valve seat 26 and the guide 21 of the valve 21 on the guide 28 side becomes the first fulcrum, and the valve is opened. Then, the end 3 of the arm 24
1 and the corner 32a formed on the projection 32 come into contact with each other and open as a second fulcrum, and the back surface of the arm 24 comes into contact with the corner 32b to move the valve 21 upward as a third fulcrum. When the valve is further opened, the back surface of the arm 24 and the end 33 come into contact with each other and the valve is opened as a fourth fulcrum. And as shown in FIG.
When the shaft 23 moves downward in the guide 28 and abuts on the lower end, the shaft 23 becomes a fifth fulcrum and pushes the valve 21 further upward. In this way, the fulcrum automatically moves away from the valve 21 to increase the valve opening. Further, since the fulcrum at the time of opening the valve is located near the valve 21 and the guide 28 for guiding the shaft 23 has an arc shape, the valve can be easily opened and the air can be instantaneously introduced to the outlet O without being guided. Can be guided to the float chamber 10 and released to the atmosphere.

When the inside of the gas-liquid separation chamber 6 is filled with the oil liquid, the float 22 is pushed upward by the oil liquid, contrary to the above operation, and the fulcrum moves in the direction approaching the valve 21 to move the valve 21.
Is automatically aligned by the play between the shaft 23 and the guide 28 and the valve 2
1 closes the valve seat 26. At this time, the hemispherical valve 2
1 is seated on the valve seat 26 as the shaft 23 moves. Further, since these are all made of synthetic resin, it is only necessary to fit the shaft 23 into the guide 28 formed on the support 27, so that the number of assembly steps and the number of parts can be reduced. In addition, dimensional accuracy is not required, and variations in accuracy due to the assembling method are eliminated.

The present invention is not limited to the above embodiment, but can be applied to a valve device 13 for liquid outflow as shown in FIG. 5, and an arm 24 provided with a shaft 23 on one side and a float 22 on the other side. A valve 21 is provided in the middle of the valve seat, and the other points are the same as those in the above-described embodiment.
When the fulcrum moves from the axis to the shaft 23, the valve is opened as shown by the dashed line.

[0017]

As described in detail above, the valve device according to the present invention is provided at the upper end of the outflow pipe in a valve device used for a pump housed in a fuel supply device for supplying fuel oil to an automobile or the like. A valve seat, a guide fixed to the outflow pipe, and a valve close to the valve seat provided at one end, and a shaft guided by the guide provided at an intermediate portion of an arm provided with a float at the other end. The shaft is in contact with the upper end of the guide when the valve is in close contact with the valve seat. Therefore, according to the present invention, the opening of the valve is facilitated, and the fulcrum moves as the opening of the valve progresses, so that a large valve opening can be obtained. In addition, since it is composed of two parts, the outflow pipe and the valve element, the number of assembly steps can be reduced. Further, since the guide has an arc shape centered on the guide side of the contact portion between the valve seat and the valve, the opening and closing of the valve can be performed smoothly. Further, since the valve has a hemispherical shape, the valve can be easily seated on the valve seat, and the requirement for dimensional accuracy is small, and the variation in product accuracy is reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pump device to which a float valve according to the present invention is applied.

FIG. 2 is a partially enlarged sectional view showing a float valve for air outflow.

FIG. 3 is a partially enlarged plan sectional view showing an air outflow float valve.

FIG. 4 is a partially enlarged sectional view showing a float valve for outflow of air when the valve is opened.

FIG. 5 is a partially enlarged sectional view showing a liquid outflow float valve according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Suction strainer 3 Check valve 4 Suction port 5 Discharge port 6 Gas-liquid separation chamber 7 Discharge strainer 8 Control valve 9 Inlet part 10 Float chamber 11 Liquid path 12 Air vent 13 Liquid discharge valve device 14 Flow path 15 Air outflow Valve device 21 Valve 22 Float 23 Shaft 24 Arm 25 Valve body 26 Valve seat 27 Support 28 Guide 29 Outflow pipe 30 Stepped section 31, 33 End 32 Convex part 32a, 32b Corner C Casing I Inlet O Outlet P pump

Claims (3)

[Claims] A valve seat provided at an upper end of an outflow pipe; a guide fixed to the outflow pipe; A valve body provided at one end with a valve that is in close contact with the valve seat, and a valve body provided with a shaft guided by the guide at an intermediate portion of an arm provided with a float at the other end, and in a state where the valve is in close contact with the valve seat. A valve device, wherein a shaft is in contact with an upper end of a guide. 2. The valve device according to claim 1, wherein the guide has an arc shape centered on a guide side of a contact portion between the valve seat and the valve. 3. The valve device according to claim 1, wherein the valve has a hemispherical shape.