JP3843585B2 - Valve device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a valve device used for a pump housed in a fueling device installed in a fueling station.
[0002]
[Prior art]
In the oil supply device of the gas station, the oil liquid pumped up by the pump is supplied to the fuel tank of the automobile. However, since a small amount of air is mixed in the oil liquid, it is shown in FIG. Thus, the gas-liquid separation chamber 6 is provided on the discharge side of the pump, and the oil liquid containing a relatively large amount of air is separated into the air and the liquid containing the air in the gas-liquid separation chamber 6, and the air flows out of the air. Then, it flows into the float chamber 10 through the flow path 14 by the valve device 15 for use, is discharged to the atmosphere from the air vent 12, and the liquid is returned to the pump P again.
[0003]
[Problems to be solved by the invention]
Further, when the oil liquid in the underground tank is emptied or the pipe is broken, a large amount of air flows into the gas-liquid separation chamber 6 at a time, and a large amount of air fills the gas-liquid separation chamber 6. . As a result, air leaks to the discharge port O, and the flow meter connected to the discharge port O measures the air, and in order to prevent an error in the measurement of the amount of oil supply, the gas-liquid separation chamber 6 A flow path 14 through which air is released is provided, and a valve device 15 for air outflow is provided in the flow path 14. However, the pressure in the gas-liquid separation chamber 6 is higher than the pressure in the float chamber 10 communicated with the atmosphere, and the valve is pressed against the valve seat, so that it is difficult to open the valve.
[0004]
The present invention has been made in view of such problems, and an object of the present invention is to provide a valve device that can simultaneously obtain ease of valve opening and a large valve opening amount.
[0005]
[Means for Solving the Problems]
In order to solve such a problem, in the present invention, in a valve device used in a pump housed in a fuel supply device that supplies fuel oil to an automobile or the like, a valve seat provided at an upper end of an outflow pipe; A valve fixed to a pipe and a valve body provided with a valve closely contacting the valve seat at one end, and provided with a shaft guided by the guide in the middle of an arm provided with a float at the other end. The shaft is in contact with the upper end of the guide while being in close contact with the valve seat.
[0006]
Therefore, according to the present invention, when the valve is opened, the fulcrum is positioned near the valve to facilitate valve opening, and as the valve is opened, the fulcrum is moved away from the valve to obtain a large valve opening amount. . In addition, since it is composed of two parts, an outflow pipe and a valve body, the number of assembling steps is reduced.
[0007]
Further, since the guide has an arc shape centering on the guide side of the contact portion between the valve seat and the valve, the valve is smoothly opened and closed.
[0008]
Further, since the valve is hemispherical, it is easy to be seated on the valve seat, requiring less dimensional accuracy and reducing variations in product accuracy.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described 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 sectional 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.
[0010]
As shown in FIG. 1, the pump device 1 includes a casing C, and the casing C is provided with an inlet I at the lower part and an outlet O at the upper part. 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 substantially at 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. In the gas-liquid separation chamber 6, the liquid not containing air is formed so as to be guided to the outlet port O via the discharge-side discharge strainer 7 and the control valve 8.
[0011]
On the other hand, a liquid passage 11 is provided at the inlet 9 of the gas-liquid separation chamber 6 to allow a liquid containing a large amount of air to flow out to the float chamber 10, and an air vent 12 for releasing the air flowing in through the liquid passage 11 to the atmosphere, The float chamber 10 is provided with a liquid outflow valve device 13 for returning the separated liquid to the inflow side. In addition, an air outflow valve device 15 according to the present invention is provided above the gas-liquid separation chamber 6 to allow air to flow into the float chamber 10 via the flow path 14 when a large amount of air flows. .
[0012]
The main part of the present invention will be described with reference to FIGS. First, a hemispherical valve 21 is connected to one end, a float 22 that swings according to the liquid level is connected to the other end, and a valve body 25 comprising an arm 24 having a shaft 23 in the middle, and a valve seat 26 that receives the valve 21 on the upper end. An outflow pipe 29 formed with a support body 27 in the vicinity of the valve seat 26 and a guide 28 for movably guiding the shaft 23 provided on the arm 24 is formed on the support body 27. 29 is inserted into the flow path 14. A step portion 30 is formed in the outflow pipe 29 in order to prevent the outlet pipe 29 from coming out of the flow path 14. Further, the guide 28 has a circular arc centered on the guide 28 side of the valve 21 and valve seat 26 contact portion so that the valve 21 can automatically align with the valve seat 26.
[0013]
A convex portion 32 is formed on the guide 28 side from the valve seat 26 and at a distance from the valve seat 26 so that the end portion 31 of the arm 24 abuts. The convex portion 32 is lowered toward the float 22 side. A slope is formed. The convex portion 32 forms a corner portion 32 a with which the end portion 31 abuts and a corner portion 32 b with which the back surface of the arm 24 abuts. 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 is lifted by the buoyancy of the oil and the valve 21 is closed.
[0014]
Next, the operation will be described. For example, when the oil liquid in the underground tank is emptied 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 the air As a result, the gas-liquid separation chamber 6 is filled. When the float 22 is lowered by its own weight, the contact on the guide 28 side of the valve seat 26 and the valve 21 becomes the first fulcrum and valve opening is started. And the edge part 31 of the arm 24 and the corner | angular part 32a formed in the convex part 32 contact | abut, it opens as a 2nd fulcrum, the back surface of the arm 24 and the corner | angular part 32b contact | abut, and the valve | bulb 21 is made into a 3rd fulcrum. Move upward. When the valve is further opened, the back surface of the arm 24 and the end 33 come into contact with each other to open the valve as a fourth fulcrum. Then, as shown in FIG. 4, the shaft 23 moves downward in the guide 28 and comes into contact with the lower end to become a fifth fulcrum and push the valve 21 further upward. Thus, the fulcrum automatically moves away from the valve 21 to increase the valve opening amount. Further, since the fulcrum when the valve is opened is located in the vicinity of the valve 21 and the guide 28 for guiding the shaft 23 has an arc shape, the valve is easy to open and air is not led to the outlet O. To the float chamber 10 to be released into the atmosphere.
[0015]
Further, when 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 so that the valve 21 is moved to the shaft 23. The valve 21 closes the valve seat 26 by automatically aligning with the backlash of the guide 28. At this time, the hemispherical valve 21 is seated on the valve seat 26 as the shaft 23 moves. Furthermore, 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. Further, dimensional accuracy is not required, and variations in accuracy due to the assembly method are eliminated.
[0016]
The present invention is not limited to the above specific example, but can be applied to a liquid outflow valve device 13 as shown in FIG. 5, and is provided in the middle of an arm 24 provided with a shaft 23 on one side and a float 22 on the other side. The valve 21 is provided, and the other points are the same as in the previous embodiment, and the valve is opened as indicated by the alternate long and short dash line when the fulcrum moves from the valve seat 26 to the shaft 23 by the rise of the liquid in the float chamber 10.
[0017]
【The invention's effect】
The valve device according to the present invention is as described above in detail, and 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 provided at the upper end of the outflow pipe; The valve is provided with a guide fixed to the outflow pipe and a valve close to the valve seat at one end and a shaft guided by the guide at an intermediate portion of the 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 valve can be opened easily, and the fulcrum can be moved as the valve is opened to obtain a large valve opening. In addition, since it is composed of two parts, an outflow pipe and a valve body, the number of assembling steps is reduced. Further, since the guide has an arc shape centering on the guide side of the contact portion between the valve seat and the valve, the valve is smoothly opened and closed. Furthermore, since the valve has a hemispherical shape, it is easy to be seated on the valve seat, requiring less dimensional accuracy and reducing variations in product accuracy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a pump device to which a float valve of the present invention is applied.
FIG. 2 is a partially enlarged sectional view showing an air outflow float valve.
FIG. 3 is a partially enlarged plan sectional view showing a float valve for outflow of air.
FIG. 4 is a partially enlarged cross-sectional view showing an air outflow float valve when the valve is open.
FIG. 5 is a partially enlarged cross-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 Valve apparatus 14 for liquid outflow 14 Flow path 15 Air outflow Valve device 21 Valve 22 Float 23 Shaft 24 Arm 25 Valve body 26 Valve seat 27 Support body 28 Guide 29 Outflow pipe 30 Step part 31, 33 End part 32 Projection part 32a, 32b Corner part C Casing I Inlet O Outlet P pump

Claims (3)

In a valve device used for a pump housed in an oil supply device for supplying fuel oil to an automobile or the like,
A valve seat provided at the upper end of the outflow pipe, a guide fixed to the outflow pipe, a valve in close contact with the valve seat is provided at one end, and the guide is guided to the intermediate section of the arm provided with a float at the other end. A valve device comprising: a valve body provided with a shaft, wherein the shaft is in contact with the upper end of the guide when the valve is in close contact with the valve seat. The valve device according to claim 1, wherein the guide has an arc shape centering on a guide side of a contact portion between the valve seat and the valve. The valve device according to claim 1, wherein the valve has a hemispherical shape.

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