Fuel nozzle

Abstract

[Problem] To provide a refueling nozzle capable of easily adjusting a minute flow rate while improving durability of a main valve constituting a flow rate control mechanism. [Solution] This refueling nozzle receives a liquid from a refueling hose at an inflow port 11, and discharges the liquid out of a nozzle end part 16 through a main valve 15 which is opened and closed by a refueling lever 14 via a valve rod 13 constantly biased in a valve closing direction. The refueling nozzle comprises a flow rate control mechanism 19 that is located upstream of the main valve 15 and that can be operated by the refueling lever. The flow rate control mechanism 19 comprises a through-hole 17 formed in the main valve 15, and a small valve having a protruded part 21 that can close the through-hole 17 and that can be advanced and retreated in the through-hole 17.

Description

Technical Field

[0001] The present invention relates to a fueling nozzle, and more particularly to the structure of a flow rate adjustment mechanism.

Background Art

[0002] When fueling with a fueling nozzle, in the case of full-tank fueling to fill the fuel tank of a vehicle, preset fueling to fuel a set amount or a set amount of fuel oil, or integer fueling to end the fueling amount with an integer value, etc., micro fueling with a minute flow rate is required at the final stage of fueling.

[0003] For this reason, as seen in Patent Document 1, in the case of preset fueling or integer fueling, a method of adjusting the flow rate by a solenoid valve of the fueling device main body or a fueling operator manually finely adjusts the fueling lever of the fueling nozzle to throttle the flow rate.

[0004] As a fueling nozzle suitable for the latter case of manually performing micro fueling, as shown in FIG. 10, a through hole 5 is formed in a main valve 4 provided on a valve stem 3 that is interlocked with the displacement amount of a fueling lever 1 and is constantly urged in the valve closing direction by a spring 2, and a flow rate control mechanism 7 that adjusts the opening degree with respect to this through hole 5 by a small valve 6 that can be adjusted by the valve stem 3 (fueling lever 1) has also been put into practical use.

[0005] When this fueling nozzle pulls up the fueling lever 1 against the biasing force of the spring 2, the small valve 6 moves away from the main valve 4 and the through hole 5 opens. When it further moves to the limit point, this time the main valve 4 moves corresponding to the movement amount of the fueling lever 1, and the liquid flowing in from the fuel hose connection port 10 is discharged from the tip of the nozzle cylinder.

[0006] On the other hand, in the flow control mechanism 7, when the main valve 4 is seated on the valve seat and the small valve 6 is away from the through hole 5, the small valve 6 responds to the displacement of the lubrication lever 1, allowing the degree of opening with respect to the through hole 5 to be adjusted. To ensure flow rate adjustment in the minute flow rate range and sealing when the valve is closed, the small valve 6 has a conical (tapered) surface 6a facing the through hole 5, as shown in Figure 11, and its central mounting hole 8 is fixed to the end of the valve shaft 3.

[0007] On the other hand, the main valve 4 is made of an elastic material such as rubber to ensure a tight seal with the valve seat 9, and for this reason, there is a risk that the load will be concentrated on the outer circumference of the through hole 5, causing wear. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 61-217397 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] This invention has been made in view of the above problems, and its objective is to provide a fuel nozzle that can easily adjust minute flow rates while improving the durability of the main valve constituting the flow rate control mechanism. [Means for solving the problem]

[0010] To solve these problems, the present invention provides a fuel nozzle that receives liquid from a fuel hose at an inlet and discharges it from the nozzle tip via a main valve, which is opened and closed by a fuel lever, through a valve shaft that is constantly biased in the closing direction, wherein the nozzle is equipped with a flow control mechanism operable by the fuel lever on the upstream side of the main valve, the flow control mechanism is equipped with a through hole formed in the main valve and a small valve equipped with a projection that can close the through hole and can move back and forth in the through hole, and a notch is formed in the projection. The notch is formed such that the through-hole side is closer to the valve stem. It is. [Effects of the Invention]

[0011] According to the present invention, a minute flow rate The gap between the slope of the notch and the through hole can be adjusted, and furthermore, the distance between the slope and the through hole changes as the valve stem moves. The minute flow rate can be easily adjusted. [Brief explanation of the drawing]

[0012] [Figure 1] A diagram showing a reference example of a fuel nozzle according to the present invention. [Figure 2] A magnified view of the valve mechanism of the same fuel nozzle. [Figure 3] A magnified view of the small valves that make up the flow control mechanism of the same fuel nozzle. [Figure 4] A diagram showing a reference example of a fuel nozzle according to the present invention, specifically the valve mechanism. [Figure 5] A magnified view of the small valves that make up the flow control mechanism of the same fuel nozzle. [Figure 6] A diagram showing a reference example of a fuel nozzle according to the present invention, specifically the valve mechanism. [Figure 7] A magnified view of the small valves that make up the flow control mechanism of the same fuel nozzle. [Figure 8] A diagram showing a valve mechanism of the first embodiment of the fuel nozzle of the present invention. [Figure 9] A magnified view of the small valves that make up the flow control mechanism of the same fuel nozzle. [Figure 10] A diagram showing an example of a conventional fuel nozzle with a flow control mechanism. [Figure 11] A magnified view of the small valves that make up the flow control mechanism. [Modes for carrying out the invention]

[0013] Figures 1-3 show the refueling nozzle with flow control mechanism of the present invention. referenceThis is an example showing a fueling nozzle that receives liquid from a fuel hose at an inlet 11, passes it through a main valve 15 that is opened and closed by a fueling lever 14 via a valve stem 13 that is constantly biased by a spring 12 in the valve closing direction, and discharges it from the tip of a nozzle cylinder 16. A through hole 17 is formed in the main valve 15, and a flow rate control mechanism 19 is provided that opens and closes this through hole 17 with a check valve 18 provided on the upstream side to adjust the opening degree with respect to the through hole.

[0014] In this reference example, as shown in FIG. 3, the check valve 18 has a convex portion 20 that is concentric with the valve stem 13 on the surface facing the through hole 17 of the main valve 15 and is capable of advancing and retreating with respect to the through hole 17, a convex portion 21 that is also capable of advancing and retreating with respect to the through hole 17 and adjusts the opening degree with respect to the through hole 17, and further, a flat portion 22 that closes the through hole 17 of the main valve 15 is formed.

[0015] In this reference example, according to this, when the valve is closed, the flat portion 22 of the check valve 18 is in surface contact with the outer peripheral surface of the through hole 17 to close the through hole 17. Also, when adjusting a minute flow rate, the convex portion 21 for flow rate adjustment moves in response to the displacement of the valve stem 13 to move the through hole 17 and change the gap with the through hole 17, thereby adjusting a minute flow rate.

[0016] As a result, in the region 15a that constitutes the outer peripheral surface of the through hole 17, that is, in the region of the through hole 17 facing the check valve, the valve can be closed without the load of the check valve 18 concentrating.

[0017] FIGS. 4 and 5 show an reference example of the present invention, and in this reference example, a tapered portion 23 is formed on the side surface of the convex portion 21 for flow rate adjustment such that the diameter on the side of the through hole is smaller.

[0018] In this reference example, according to this, when adjusting a minute flow rate, the position of the taper 23 facing the through hole 17, that is, the diameter changes in response to the movement of the valve stem 13, so the opening degree can be adjusted subtly.

[0019] FIGS. 6 and 7 show an reference example of the present invention, and in this referenceIn this example, the notches 24 are preferably positioned at equal intervals with respect to the valve shaft 13 on the side surface of the flow rate adjustment protrusion 21. reference In this example, they are formed in two opposing locations.

[0020] According to this embodiment, the minute flow rate can be adjusted in the gap between the notch 24 of the protrusion 21 and the through hole 17, allowing for easy adjustment of the minute flow rate. Furthermore, by forming the notches 24, 24 at equal intervals, the pressure applied to the small valve 18 can be made uniform, stabilizing the valve opening when adjusting the minute flow rate.

[0021] Figures 8 and 9 illustrate the present invention. one This shows an example, in which the notch on the side of the flow rate adjustment protrusion 21 ( See above for reference. In the example, reference numeral 24), a slope 25 is formed with the through-hole side closer to the valve shaft, preferably at a position that is equally spaced with respect to the valve shaft 13.

[0022] According to this embodiment, the minute flow rate can be adjusted by the gap between the inclined surface 25 of the notch and the through hole 15, and furthermore, the distance between the inclined surface 25 and the through hole 17 changes as the valve shaft 13 moves, allowing for adjustment of the minute flow rate. [Industrial applicability]

[0023] According to the present invention, even with a fuel nozzle for high-flow fuel supply, minute flow rates can be precisely adjusted by operating the fuel supply lever. [Explanation of Symbols]

[0024] 11 Inlet 12 springs 13 Valve shaft 14. Fueling lever 15. Chief Officer 16 Nozzle cylinder tip 17 Through hole 18 small bento boxes 19 Flow control mechanism 20 Convex part 21 Convex part 22 Plane part

Claims

[Claim 1] A fuel nozzle that receives liquid from a fuel hose at an inlet and discharges it from the nozzle tip via a main valve, which is opened and closed by a fuel lever, through a valve shaft that is constantly biased in the closing direction, wherein a flow control mechanism operable by the fuel lever is provided upstream of the main valve, and the flow control mechanism is composed of a through hole formed in the main valve and a small valve having a protrusion that can close the through hole and can move in and out of the through hole, and a notch is formed in the protrusion, and a slope is formed in the notch so that the through hole side is closer to the valve shaft.

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