JPH0128077Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a refueling nozzle with an automatic stop function used when refueling an automobile with oil such as gasoline at a refueling station. This is effective when hydraulic pressure acts on the auxiliary valve when oil supply is stopped.

(b) Prior Art A type of nozzle in which the main valve automatically closes and stops refueling when the nozzle is filled with oil is used at almost all filling stations. It is widely known that these nozzles have a built-in auxiliary valve that is opened by oil pressure, and that they automatically close by utilizing the negative pressure created by the oil passing through the valve.

On the other hand, in recent years, oil supply devices have come into use that stop the pump or close the oil supply path using a solenoid valve or the like to end the oil supply when a pre-specified amount of oil is reached. However, at the end of this process, the main valve of the nozzle remains open, so the pressure of the oil corresponding to the difference in head exerts a large effect on the auxiliary valve of the nozzle, especially in the case of an oil supply system that is suspended from the ceiling. As a result, oil pushes the auxiliary valve open and flows out, resulting in inconveniences such as more oil being supplied or being sprayed than expected.

Although the auxiliary valve is lightly biased in the direction of closing by a spring, there is a problem in that if the spring is made stronger to eliminate the above problem, the flow velocity during refueling will decrease.

(c) Purpose The purpose of the present application is to strongly close the auxiliary valve without strengthening the spring of the auxiliary valve, and at the same time, prevent the flow rate from decreasing during refueling.

(d) Structure and operation The structure for achieving the above purpose consists of a main valve whose oil flow path inside the main body is opened and closed by lever operation, and a negative pressure generating means installed downstream of the main valve to control the oil flow. In a nozzle that has an auxiliary valve that is biased in a direction that resists the flow of oil and is opened by the flow of oil to generate negative pressure, a special resistance part that is integral with the auxiliary valve has a auxiliary valve that is perpendicular to the displacement direction of the auxiliary valve. A direction in which a plurality of pressing means are provided to apply a force in a direction such that when the auxiliary valve is at or near the valve closing position, the specific portion on which the pressing means acts is applied to the auxiliary valve in a direction that causes a component force in the valve closing direction to be applied to the auxiliary valve. The specific portion on which the pressing means acts when the auxiliary valve is not at or near the closed position is formed parallel to the displacement direction of the auxiliary valve, and the auxiliary valve is at or near the closed position. The component force of the action of the pressing means acts in the valve closing direction to forcefully close the auxiliary valve, but this component force does not work when the auxiliary valve is in another position.

(e) Embodiment FIG. 1 shows a nozzle according to an embodiment of the present application, where 2 is the nozzle body, 4 is a valve that opens and closes the oil flow path 6, and 8 is the main valve 4.
A lever 10 for opening and closing is a diaphragm chamber divided into an upper chamber 14 and a lower chamber 16 by a diaphragm 12.

Reference numeral 18 denotes a negative pressure passage which guides the negative pressure generated when oil flows through the auxiliary valve 20 against the bias of the spring 22 to the upper chamber 14 .

24 is an air compensation path, and its open end 24 to the outside air
is opened at the tip of the nozzle pipe 28, and the other end is opened to the negative pressure passage 18, and the generated negative pressure is compensated by the air flowing in from the open end 26, and the upper chamber 1
The negative pressure value within the main valve 4 displaces the diaphragm 12 upwardly and operates the automatic closing mechanism 30, causing the main valve 4 to close.
It is maintained to the extent that it does not close, that is, to the extent that it does not exceed a certain value.

As is well known, the oil level rises during refueling and the open end 2
6, and when air cannot be supplied via the air compensation path 24, the negative pressure value in the upper chamber 14 changes beyond a certain value, displacing the diaphragm 12 upward and operating the automatic closing mechanism 30. and close the main valve 4 to stop oil discharge.

Since the above-mentioned configuration and operation are well known, the details thereof are only shown in the drawings and will not be described.

In FIG. 2, 32 is a connecting block that connects the main body 2 and the pipe 28, and the central axis (specific portion) 34 of the auxiliary valve 20 is connected to the boss 36 of the connecting block 32.
It is slidable with respect to the guide hole 38 drilled in the
The valve seat 4 of the main body 2 is moved by the spring 22 described above.
0, the umbilical valve body portion 42 is always biased in the direction in which it is seated.

44 is a hole bored through the boss 36 in a direction perpendicular to the axial direction of the guide hole 38, and a steel ball 48 biased by a spring 46 is disposed in this hole. 4
8 is always in contact with somewhere on the central shaft 34.

Reference numeral 50 indicates a sloped portion formed into a conical shape on the central axis 34;
2 is a stopper formed at the end of the central shaft 34 to prevent the steel ball 48 from falling into the guide hole 38 and to prevent the central shaft 34 from falling out from the guide hole 38.

54 is attached to the outer periphery of the boss 36 and the spring 4
One end of the spring 22 is pressed against the flange portion 46 at the lower end of the cylindrical stopper to prevent the spring 22 from popping out from the hole 44, and the spring 22 is virtually fixed at the position shown.

In the above configuration, during oil supply (while the pump pressure is acting on the auxiliary valve 20), the auxiliary valve 20 is pushed open by the oil flowing through the flow path 6 and is placed in the position indicated by the two-dot chain line in FIG. come. At this time, since the center shaft 34 also moves, the steel ball 48 is removed from the inclined portion 50, and even though it is biased by the spring 46 in the direction of the center shaft 34, the center shaft 34 does not move. It simply rolls against the valve and has no effect on the auxiliary valve. However, when the pump (not shown) is stopped or the pipe leading to the nozzle is closed by a solenoid valve (not shown), so that the pressure of the pump no longer acts, the auxiliary valve 20 is moved by the solid line due to the elasticity of the spring 22. The steel ball 48 returns to the position, seats on the valve seat 40, and closes the valve. At this time, the steel ball 48 is in contact with the inclined portion 50 of the central shaft 34.
The force exerted by the steel ball 48 in the direction perpendicular to the axial direction of the central shaft 34 is divided to generate a component force in the direction to close the auxiliary valve 20, which, together with the bias from the spring 22, overcomes the hydraulic pressure due to the head. This will ensure that the valve is closed.

In addition, in this embodiment, a method was adopted in which an inclined part was provided on the central axis and a steel ball was pressed against this central axis. Alternatively, a steel ball may be used to press against the steel ball, or a ball made of resin or ceramic may be used instead of the steel ball, or a non-rolling pressing method using slippery Teflon taps may be used. The number of pressing means is not limited to two.

(F) Effect As detailed above, since the configuration is such that when the auxiliary valve is at or near the closing position, the component force in the closing direction by the pressing means is added, it is possible to avoid the head difference that would occur when a conventional nozzle is used. This eliminates the natural opening of the auxiliary valve due to hydraulic pressure, which eliminates the risk of discharging more than the expected amount of oil.Furthermore, there is no reduction in the flow rate of oil due to the presence of a pressing means during refueling, making the refueling work easier. It is possible to obtain an effective nozzle that does not cause any adverse effects such as prolonged water flow.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a main part of an automatic stop nozzle according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the inner auxiliary valve shown in FIG. 1. 2... Main body, 20... Auxiliary valve, 48... Steel ball, 50... Inclined portion.

Claims (1)

[Scope of utility model registration request] The oil flow path inside the main body has a main valve that can be opened and closed by lever operation, and is installed downstream of the main valve as a means for generating negative pressure and is biased in a direction against the oil flow. In a nozzle that has an auxiliary valve that is opened to generate negative pressure, a plurality of pressing means that apply a force in a direction perpendicular to the direction of displacement of the auxiliary valve are provided on a specific part that is integral with the auxiliary valve, while the auxiliary valve When the auxiliary valve is at or near the valve-closing position, the specific portion on which the pressing means acts is inclined in a direction that generates a component force in the valve-closing direction on the auxiliary valve, and when the auxiliary valve is not at or near the valve-closing position. A refueling nozzle characterized in that the specific portion on which the pressing means acts is formed parallel to the displacement direction of the auxiliary valve.