JPH037888B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a refueling nozzle for a refueling device having a liquid level sensor, particularly a liquid level sensor using light, near the tip of the nozzle portion.

[Prior Art] Various types of refueling nozzles for such refueling devices have been proposed, and in order to better understand the present invention, an example of a refueling device to which the present invention is applied will first be described with reference to FIG. In FIG. 1, 1 is a refueling device;
2 is a pump, 3 is a drive motor for pump 2, 4 is a flow meter, 5 is a main valve, 6 is an oil supply nozzle, and 7 is a hose. When the motor 3 is driven, oil is supplied from an underground tank (not shown) through a pipe 8. Then, the oil is sent to the hose 7 via the flow meter 4 and the main valve 5, and the oil is sent from the oil supply nozzle 6 to, for example, a fuel tank T of a car.
It is designed to be sent to the fuel filler port O.

The refueling nozzle 6 is normally hung on the nozzle hook 9, and when the refueling nozzle 6 is removed from the nozzle hook 9, the nozzle detection switch SW ₁ closes to drive the motor 3, and the main valve 5 opens to complete the preparation for refueling. I'm starting to do that.

The refueling nozzle 6 is provided with a liquid level sensor S consisting of a light emitter and a light receiver at the tip of its nozzle portion 6a. Therefore, the nozzle portion 6 of the refueling nozzle 6
Insert a into the fuel filler port O of the car's fuel tank T,
When the lever 11 is pulled and applied to the lever locking piece 11a to open the nozzle valve 12, the oil pumped through the hose 7 passes through the nozzle valve 12, pushes open the check valve 13, and flows out from the tip of the nozzle portion 6a. do. The amount of oil is determined by the pulse transmitter 4a of the flow meter 4.
The pulse signal is then transmitted to the control circuit C, where it is integrated and displayed on the display meter 10. As the refueling operation progresses, the liquid level in the fuel tank T rises, but oil bubbles rise before the liquid level. The liquid level sensor S detects bubbles and its signal is passed through the line 14 to the control circuit C, which closes the main valve 5.

Then, after the bubbles disappear, for example, 2 seconds, the main valve 5 is opened by a signal from the control circuit C, and the main valve 5 is closed again by a signal from the liquid level sensor S. When the above operation is repeated several times, the liquid reaches the liquid level sensor S of the nozzle, and the tank becomes so-called full.

Next, the lever 11 is removed from the locking piece 11a, the nozzle valve 12 is closed, and the refueling nozzle 6 is hung on the nozzle hook 9, thereby completing the refueling operation.

Since the diameter of the oil supply nozzle portion as described above is relatively small, the overall structure of the liquid level sensor must be made small in order to ensure the amount of oil supply.

In general, technology that uses light-based liquid level sensors to detect the liquid level is widely used; for example, in Japanese Utility Model Application Publication No. 57-35623, when refueling a tank with kerosene, when the tank is full, an electric Techniques to shut down the pump have been initiated. However, with such known technology, once the sensor detects the detection, the operation can be stopped, but in the case of a liquid such as gasoline that generates bubbles or splashes during refueling, the refueling operation must be stopped once the bubbles are detected as described above. However, since refueling is restarted when the bubbles and the like disappear, consideration must be given to promptly discharging the bubbles and the like when they flow into the sensor chamber.

Also, when inserting the refueling nozzle into the refueling port of a fuel tank of a car, etc., insert it at an angle instead of vertically from above like in a kerosene tank, and depending on the position when refueling, the refueling nozzle may be inserted into the nozzle part. It may be inserted at a position slightly rotated around the axis. Therefore, if the above-mentioned technique is applied as is, there are drawbacks such as backflow of oil from the air vent hole or insufficient discharge of bubbles, etc., resulting in a long time required to restart refueling and malfunction of the sensor.

Further, the technique disclosed in, for example, Japanese Utility Model Application Publication No. 57-83430 also has the same drawbacks as mentioned above.

[Problems to be Solved] Therefore, an object of the present invention is to quickly discharge oil bubbles and droplets that have reached the liquid level sensor regardless of the orientation of the refueling nozzle inserted into the refueling port, thereby preventing malfunctions. The present invention provides a refueling nozzle for a refueling device having no liquid level sensor.

[Means for Solving the Problem] According to the present invention, in a refueling nozzle of a refueling device having a liquid level sensor near the tip of the nozzle portion,
A sensor mounting body is provided at the tip of the nozzle portion, and a U-shaped sensor chamber is provided with two sensor mounting legs extending perpendicularly from the plate-shaped portion of the sensor mounting body. A wiring room for each sensor is configured on the opposite side of the sensor room, an air vent room is provided that communicates with the sensor room through a hole at the rear end of the sensor room, and the light emitter and photoreceptor are installed in a position facing the sensor room. , the wiring to the light emitter and photoreceptor is routed inside the wiring room and filled with resin.
Air vent holes are provided on both sides of the air vent chamber, and holes communicating with the air vent holes are provided in the nozzle portion.

[Description of the effects of the invention] Therefore, as the liquid level rises, the bubbles and droplets generated during the refueling operation also rise and flow into the U-shaped sensor chamber. At this time, the sensor chamber communicates with the air vent chamber through the hole, and the air vent chamber further communicates with the hole in the nozzle portion through the two air vent holes on both sides, so that the rise in the liquid level is not hindered. Then, the liquid level sensor is activated, the main valve is closed, and the refueling operation is temporarily stopped. Since there is a hole that communicates with the outside of the nozzle portion, the bubbles and droplets that have flowed into the sensor chamber are not blocked, and therefore can quickly flow out from the side from which they flowed.

In addition, since there are air vent holes on both sides of the air vent chamber, even if one air vent hole is closed due to the orientation of the refueling nozzle, bubbles and droplets that have entered the air vent chamber can be quickly communicated with the sensor chamber or through the other air vent hole. It can be discharged from the hole.

Furthermore, even if one air vent hole is closed due to a sudden rise in the liquid level for some reason, the sensor chamber is communicated with the outside of the nozzle part through the other air vent hole, so air is trapped inside the sensor chamber and the liquid is There is nothing that will stop you from rising.

As described above, according to the present invention, the sensor chamber can always communicate with the air outside the nozzle regardless of the orientation of the refueling nozzle, and the air in the sensor chamber is trapped to prevent the liquid level from rising. There is no malfunction, and rising foam and droplets can be quickly discharged to facilitate the next refueling operation.

Furthermore, since the central sensor chamber is a liquid passage and wiring is provided to the chambers on both sides, the overall size can be reduced, and since the wiring is not immersed in liquid, there is no failure or malfunction. Furthermore, the central sensor chamber can also have a relatively wide cross-sectional area, making it easy for liquid to flow in.

[Implementation] Hereinafter, the case where the present invention is implemented in the oil supply device shown in FIG. 1 will be described in detail with reference to FIGS. 2 to 7.

In FIGS. 2 to 4, the entire cylindrical nozzle portion 6a of the refueling nozzle 6 has two parts inside the tip.
A sensor mounting body indicated by 0 is mounted with a spring 21, and this mounting body 20 has a plate-like part 20a, and a light-emitting body 22 and a light-receiving body 23 extending perpendicularly from the plate-like part 20a and serving as a sensor. The sensor mounting legs 24 and 25, which are mounted opposite each other, form a central compartment, that is, a sensor chamber 28, and wiring chambers 50, 50 on both sides.
It is divided into three sections. In order to position the mounting body 20, a projection 2 is provided near the rear end of the mounting body 20.
6 is provided, the projection 26 being adapted to engage with a hole 27 in the nozzle part 6a. Both legs 24,
A sensor chamber 28 between the sensor chambers 25 and 25 serves as an inflow passage for oil to be detected. An air vent chamber 35 is provided adjacent to the sensor chamber 28 , and the air vent chamber 35 is separated from the sensor chamber 28 by a partition wall 32 and communicates with the chamber 28 by a hole 33 . Further, the air vent chamber 35 includes holes 40 (see FIG. 1) formed on both sides of the nozzle portion 6a by the air vent holes 36.
It also communicates with a hole 31 formed in the lower surface of the nozzle portion 6a. The wiring chambers 50, 50 of the signal line 29 on both sides of the sensor chamber 28 are filled with a fixing and sealing adhesive such as an epoxy resin 30. The mounting body 20 is therefore positioned in the nozzle part 6a by the protrusion 26 and the hole 27, and the spring 2
1 and is fixed to the nozzle portion 6a with epoxy resin 30.

Details of this mounting body 20 are shown in FIGS. 5 and 6. In order to attach the light emitter 22 and the light receiver 23 to the mounting legs 24, 25, the legs 24, 25 are attached.
Attachment holes 22a and 23a are formed in the legs, respectively, and the rear ends of the legs 24 and 25 are connected to the partition wall 32. Therefore, the sensor chamber 28 is closed by this partition wall 32. And this partition wall 32
A communication hole 33 is provided on the side of the plate-like portion 20a. This communication hole 33 is an air vent hole to prevent air from being trapped in the sensor chamber 28. When the mounting body 20 is attached to the nozzle portion 6a, the partition wall 32 is located adjacent to the air vent/oil outflow hole 31 on the tip side, as shown in FIG. Behind this partition wall 32, an air vent chamber 3 is formed by a U-shaped wall 34 extending at right angles from the plate-shaped portion 20a.
5 is defined, and in the upper part of this air vent chamber 35,
Holes 40 (first
An air vent hole 36 is formed opposite to the one shown in FIG. Therefore, the air vent hole 36 communicates with the sensor chamber 28 via the hole 33 and with the outside of the nozzle portion 6a via the holes 31 and 36.

The liquid level sensor embodying the present invention is constructed as described above, and its operation is mainly shown in FIG.
This will be explained below with reference to FIG.

During the refueling operation, oil passes through the inside of the nozzle portion 6a and flows out from the tip 6c of the nozzle portion 6a through the space 6b between the plate-shaped portion 20a of the mounting body 20 and the inside of the nozzle portion 6a, so that the sensor chamber 28
No liquid will flow inside. However, when the bubbles rise to the liquid level sensor S as the oil level L rises,
The air in the sensor chamber 28 flows out from the holes 31 and 36, bubbles enter the chamber 28, activate the sensor, close the main valve 5, and stop the oil supply, but the bubbles reach above the sensor S due to inertial discharge. After a while, the liquefied foam enters the air vent chamber 35 through the hole 36. This liquid is transferred to the sensor chamber 28 by the partition wall 32.
The water does not enter the inside of the tank and flows out from the hole 31, so that the sensor will not malfunction. Also, during refueling, droplets came from hole 3.
Even if the air flows in from 1 and 36, it will not enter the sensor chamber 28 due to the partition wall 32, and the sensor will not malfunction.

[Effects of the Invention] As described above, according to the present invention, not only liquid as the liquid level rises, but also bubbles and droplets easily flow into the sensor chamber, and the sensor operates quickly and smoothly. After the bubbles and droplets disappear, the liquid quickly flows out of the sensor chamber, and the next refueling operation is quickly performed, improving the refueling efficiency. Moreover, since it operates regardless of the orientation of the refueling nozzle, workers can easily perform refueling work.

In addition, the sensor chamber is generally compact, and the sensor chamber is U-shaped and has a large area, allowing smooth flow of liquid in and out, and no malfunctions. Furthermore, the wiring is sufficiently protected and there is no risk of disconnection.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram for explaining a case where a liquid level sensor according to the present invention is applied to a refueling nozzle, FIG. 2 is a side sectional view showing an embodiment of the present invention, and FIG.
The figure is an end view of Fig. 2, Fig. 4 is a central sectional view, and Fig. 5 is an end view of Fig. 2.
6 is a bottom view of the mount shown in FIG. 4, and FIG. 7 is a sectional view taken along the line -- in FIG. 5. 6... Refueling nozzle, 6a... Nozzle part, 20
... Attachment body, 20a... Plate-like portion, 22, ... Light emitter, 23... Light receptor, 24, 25... Sensor mounting leg, 28... Sensor chamber, 29... Signal line, 35...
...Air vent chamber, 31, 36...Air vent hole, 32
...Partition wall, 50...Wiring room.

Claims (1)

[Claims] 1. In a refueling nozzle of a refueling device that has a liquid level sensor near the tip of the nozzle part, a sensor mounting body is provided at the tip of the nozzle part, and two sensor mounting legs extending perpendicularly from the plate-shaped part of the sensor mounting body are used. The sensor chamber has a U-shaped sensor chamber, and the wiring chamber for each sensor is configured on the opposite side of the sensor chamber of each sensor mounting leg, and the wiring chamber is connected through a hole provided at the rear end of the sensor chamber. A light emitting body and a photoreceptor are installed in a position facing the sensor chamber, and the wiring to the light emitter and photoreceptor is routed inside the wiring chamber and filled with resin, and both sides of the air vent chamber are installed. A refueling nozzle for a refueling device, characterized in that air vent holes are provided in each of the air vent holes, and a hole that communicates with each of the air vent holes is provided in the nozzle portion.