JPH0414399Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a refueling nozzle used for refueling the fuel tank of a vehicle with oil liquid, and in particular, the present invention is provided with a liquid detection sensor and an insertion detection sensor at the tip of the discharge pipe. Regarding the refueling nozzle.

[Prior art]

Conventionally, a liquid detection sensor that detects the liquid level in the fuel tank is provided at the tip of the discharge pipe of the refueling nozzle, and by detecting the rising liquid level in the fuel tank by the liquid detection sensor, the pump drive motor is controlled. There is a known refueling device that automatically refills the tank by stopping the pump or closing a solenoid valve provided in the middle of the pipe.

On the other hand, in order to ensure the safety of refueling operations, the refueling system is configured to include an insertion detection sensor at the tip of the discharge pipe and to start the pump drive motor after detecting that the discharge pipe is inserted into the fuel tank. is also known.

[Problem that the invention attempts to solve]

Therefore, regarding the liquid detection sensor according to the prior art, the liquid detection sensor is isolated from the liquid flow path in the discharge pipe to prevent false detection of the oil flowing through the liquid flow path. The structure was such that it was exposed on the outer peripheral side of the discharge pipe.
However, with this configuration, there are problems such as damaging the liquid detection sensor when inserting the discharge pipe into the fuel filler port of the fuel tank, and making it difficult to insert the discharge pipe into the fuel filler port. . On the other hand, the insertion detection sensor also has a similar drawback.

In order to improve these shortcomings, it is conceivable to install a liquid detection sensor and an insertion detection sensor inside the tip side of the discharge pipe, but in this case, in order to provide each of these sensors separately, There is a problem in that the installation space for the liquid detection sensor increases relative to the cross-sectional area of the liquid passage, and the area of the liquid passage within the discharge pipe is narrowed.

The present invention was developed in view of these problems, and it is designed to mount a liquid detection sensor and an insertion detection sensor in a single sensor mounting case, and to install this sensor mounting case inside the tip side of the discharge pipe. The purpose is to provide a refueling nozzle with

[Means for solving problems]

In order to solve the above problems, the present invention includes a nozzle body in which a flow path having a valve mechanism is formed inside, a nozzle body that protrudes from the nozzle body so as to communicate with the flow path, and is inserted into a fuel filler port. In the refueling nozzle, the refueling nozzle includes a notched groove formed at the opening end of the distal end of the discharging pipe, and a liquid flow path of the discharging pipe that is attached to the inner surface of the distal distal end of the discharging pipe at a position corresponding to the notched groove. a sensor mounting case having a liquid guide space with a front opening into which rising oil can enter while being isolated from the sensor mounting case; a liquid detection sensor consisting of a pair of light emitting element and light receiving element, which are provided in a case in a direction perpendicular to the liquid flow path of the discharge pipe and facing each other with the liquid guiding space interposed therebetween;
In order to detect the insertion of the discharge pipe into the oil supply port based on the brightness of the liquid guide space, the insertion detection sensor is comprised of an optical detection element provided in the sensor mounting case so as to face the inside of the liquid space. It is characterized by

[Effect]

With this configuration, the liquid detection sensor detects when the fuel tank is full and the oil liquid rises through the liquid guide space, and when the discharge pipe is inserted into the fuel tank during refueling work. , insertion is detected by the liquid guide space changing from bright to dark. Furthermore, a liquid detection sensor and an insertion detection sensor can be disposed together in a single sensor mounting case by utilizing the liquid guide space.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the drawings, reference numeral 1 denotes a refueling nozzle, one side 2A of which is connected to a hose of a refueling device, and a nozzle body 2 provided with a valve mechanism (not shown) consisting of a main valve and a sub-valve inside. and a discharge pipe 3 protruding from the other end side 2B of the nozzle body 2, the discharge port 3A at the tip being inserted into the fuel tank of the vehicle;
It is generally composed of an operating lever 4 that opens and closes the valve mechanism. Then, the discharge port 3 of the discharge pipe 3
A notch groove 5 is formed on the lower surface of A by a predetermined dimension in the axial direction from the open end of the liquid flow path 3B, and a detection hole is formed at the inner side of the notch groove 5 with a slight distance from the notch groove 5. 6 is drilled.

7 is a sensor mounting case provided inside the discharge port 3A of the discharge pipe 3;
As shown in the figure, the lower surface is formed into a substantially rectangular parallelepiped shape with a tapered surface 7A along the inner diameter of the discharge pipe 3, and a liquid guide groove 7B, which will be described later, is installed so as to correspond to the notch groove 5 of the discharge pipe 3. There is. Here, the sensor mounting case 7 has the same groove width as the notch groove 5, and has a cross section that is open on the front side and has a tapered part _7B1 for guiding liquid inflow and outflow at the back.
a liquid guide groove 7B as a shaped liquid guide space;
A bottomed joint member fitting hole 7C is formed perpendicularly to the liquid flow path 3B in correspondence with the detection hole 6, and the liquid flow path 3 communicates with the fitting hole 7C and opens to the rear side.
A negative pressure tube fitting hole 7D formed parallel to B, and a stepped insertion hole 7D formed parallel to the liquid flow path 3B so as to be located between and communicate with the fitting hole 7D and the liquid guide groove 7B. A detection sensor mounting hole 7E, two signal line extraction holes 7F drilled to communicate from the sensor mounting hole 7E to a wiring groove 7J, which will be described later, and a liquid flow path on both sides of the liquid guide groove 7B. A pair of liquid detection sensor mounting grooves 7G and 7H are formed on both the left and right side faces so as to face orthogonally to 3B, and a pair of liquid detection sensor mounting grooves 7G and 7H are formed on both the left and right side faces from the sensor mounting grooves 7G and 7H toward the rear side. The wiring grooves 7I and 7J are generally formed of the wiring grooves 7I and 7J.

Reference numeral 8 denotes a bottomed cylindrical joint member that is fitted from the detection hole 6 into the joint member insertion hole 7C by, for example, press fitting, and the opening 8A side of the joint member 8 is fixed to the detection hole 6 by caulking means or the like. The sensor mounting case 7 is fixed to the discharge pipe 3 in a state separated from the liquid flow path 3B.

Reference numeral 9 denotes a negative pressure pipe inserted into the discharge pipe 3. One end of the negative pressure pipe 9 is inserted into the joint member 8 through the negative pressure pipe insertion hole 7D and fixed, and the other end extends toward a bubble detection sensor 21 to be described later. ing. The negative pressure pipe 9 forms a part of the bubble detection sensor, and the detection hole 6
The opening 8A (hereinafter referred to as the detection hole 6) of the joint member 8 serves as a bubble detection port.

10 and 11 are the liquid detection sensor mounting grooves 7G and 7.
A pair of liquid detection sensors 10 and 11 are configured as ultrasonic sensors, and one sensor 10 is an ultrasonic transmitter and the other sensor 11 is an ultrasonic receiver. It is a sensor. The liquid level is detected because the output voltage level of the ultrasonic receiving sensor 11 is different when the inside of the liquid guide groove 7B is an air space and when it becomes a liquid space due to a rise in the liquid level. It's becoming like that. Note that one sensor 10 may be an ultrasonic receiving sensor, and the other sensor 11 may be an ultrasonic transmitting sensor. The respective liquid detection sensors 10 and 11 are connected to signal lines 12 and 13 that are guided through the wiring grooves 7I and 7J and inserted into the discharge pipe 3.

Reference numeral 14 denotes an insertion detection sensor provided in the insertion detection sensor mounting hole 7E. The insertion detection sensor 14 uses a photodetecting element such as a photodiode or a phototransistor, and its detection portion extends from the sensor mounting hole 7E to the liquid guide groove 7B. It is coming within. The insertion detection sensor 14 is guided to the signal line extraction hole 7E and the wiring groove 7J, and the signal line 1 is inserted into the discharge pipe 3.
5, and when the discharge pipe is inserted into the fuel tank, the insertion is detected from the change in output voltage when the space in the liquid guide groove 7B changes from a bright state to a dark state. In addition, each sensor 10, 11
The connection portions between the sensor 14 and the signal lines 12 and 13, and the connection portion between the sensor 14 and the signal line 15 are molded with resin or the like.

Furthermore, in FIG. 1, 16 is the nozzle body 2.
A negative pressure chamber is provided near the other end 2B and is isolated from the atmospheric chamber 18 by a diaphragm 17. The negative pressure chamber 16 is connected to the negative pressure pipe 9 through a passage 16A, and there is a nozzle in the middle of the negative pressure chamber 16. A negative pressure generating mechanism (not shown) is provided that sucks air by using oil flowing in a fluid flow path (not shown) of the main body 2. During refueling, this negative pressure generation mechanism sucks outside air through the negative pressure pipe 9, and maintains the inside of the negative pressure chamber 16 at atmospheric pressure while the detection hole 6 is open to the atmosphere. 6 is blocked by oil or bubbles, it becomes impossible to suction air through the negative pressure pipe 9. Therefore, the air in the negative pressure chamber 16 is sucked and the negative pressure chamber 16 is reduced to negative pressure. It is becoming a state.

Reference numeral 19 denotes a photo-interrupter provided on the side of the atmospheric chamber 18. The photo-interrupter 19 is normally set to the OFF state by a shielding plate 20 fixed to the diaphragm 17, and the negative pressure chamber 16 is kept under negative pressure. When the diaphragm 17 is displaced downward in the figure, the shielding plate 20 is also displaced downward, so that it is set to the ON state and bubbles are detected.

Therefore, in this embodiment, a bubble detection sensor 21 is constituted by the detection hole 6, the negative pressure pipe 9, the negative pressure chamber 16, the diaphragm 17, the photointerrupter 19, the shielding plate 20, and the like.

The refueling nozzle 1 of this embodiment is constructed as described above, and the operation when this is applied to a refueling device will be described next.

First, when the refueling nozzle 1 is removed from the nozzle hook and the discharge pipe 3 is inserted into the fuel tank, the surrounding air near the discharge pipe 3 becomes dark, so the insertion detection sensor 14 detects this and outputs an insertion detection signal. , starts the pump drive motor.

Here, when the valve mechanism in the nozzle body 2 is opened by the operation lever 4, the oil liquid from the oil supply device is discharged from the discharge pipe 3 into the fuel tank. At this time, the space within the liquid guide groove 7B of the sensor mounting case 7 opens only to the discharge port 3A of the discharge pipe 3 and the notch groove 5, and is isolated from the liquid flow path 3B.
The liquid detection sensors 10 and 11 will not erroneously detect the oil liquid being discharged as the liquid level.

When the detection hole 6 is blocked due to foaming of gasoline during refueling even though the tank is not actually full, the negative pressure chamber 16 of the bubble detection sensor 21 is reduced to negative pressure by the negative pressure generation mechanism. Then, the photointerrupter 19 turns on and outputs a bubble detection signal. As a result, the pump drive motor is temporarily stopped, and after a predetermined bubble disappearing time, the motor is started again and refueling is resumed.

When refueling is continued by repeating refueling and stopping in this manner, the liquid level in the fuel tank rises, and the oil reaches the liquid guide groove 7B of the sensor mounting case 7.
Then, the liquid detection sensor 14 detects this, outputs a liquid detection signal, finally stops the pump drive motor, and performs the desired full refueling.

However, in this embodiment, the sensor mounting case 7 is
A pair of liquid detection sensors 10 and 1 are provided in the discharge port 3A in a state separated from the liquid flow path 3B of the discharge pipe 3, and are opposed to the liquid guide groove 7B of the sensor mounting case 7.
1, an ultrasonic sensor is provided, an insertion detection sensor 14 is provided facing the liquid guide groove 7B, and a joint member 8 of the negative pressure pipe 9 constituting the bubble detection sensor 21 is provided in the detection hole 6. , liquid detection sensors 10, 1 in a single sensor mounting case 7
1. The functions of the insertion detection sensor 14 and the bubble detection sensor 21 can be performed at the same time. Moreover, since the area occupied by the sensor mounting case 7 relative to the flow path area of the discharge pipe 3 can be reduced to about 1/4 as shown in FIG. 4, the flow path area is effectively narrowed down. can be prevented.

In addition, in the embodiment, a lever-type refueling nozzle equipped with an operating lever 4 was illustrated as the refueling nozzle 1, but
Piston-type refueling nozzles, etc. consisting of a trigger-like lever,
It may also be applied to other types of refueling nozzles. On the other hand, the liquid detection sensors 10 and 11 may be optical sensors consisting of a light emitting element and a light receiving element.

[Effect of idea]

The refueling nozzle according to the present invention is as described in detail above, and has a notch groove formed at the open end of the distal end of the discharge pipe, and a sensor mounting member installed on the inner surface of the distal end side of the discharge pipe at a position corresponding to the notched groove. A liquid guide space is formed in the sensor mounting member into which the rising oil can enter while being separated from the liquid flow path, and the liquid guide space includes a pair of opposing transmitting elements and a receiving element. Since the liquid detection sensor is provided with a liquid detection sensor and the insertion detection sensor is provided facing the liquid guide space, the liquid detection sensor and the insertion detection sensor can be placed together on a single sensor mounting member, and the flow inside the discharge pipe is Two types of sensors can be installed inside the discharge pipe without reducing the road area.

[Brief explanation of drawings]

Fig. 1 is an external view of the main part broken away showing the refueling nozzle of this embodiment, Fig. 2 is an enlarged view of the main part showing the tip of the discharge pipe in Fig. 1, and Fig. 3 is the - arrow mark in Fig. 2. Directional cross-sectional view, Figure 4 is the second section showing the tip of the discharge pipe.
The left side view of the figure, Fig. 5 shows the sensor mounting case, Fig. 5 A shows the front view, Fig. 5 B shows the top view, and Fig. 5 shows the sensor mounting case.
Figure C is a bottom view, Figure 5 D is a left side view, Figure 5 E is a right side view, and Figure 5 F is a rear view. 1... Refueling nozzle, 2... Nozzle body, 3...
Discharge pipe, 3A...discharge port, 3B...liquid flow path,
5...Notch groove, 6...Detection hole, 7...Sensor mounting case, 7A...Tapered surface, 7B...Liquid guide groove,
7C...Joint member fitting hole, 7D...Negative pressure pipe fitting hole, 7E...Insertion detection sensor mounting hole, 7E...Signal line extraction hole, 7G, 7H...Liquid detection sensor mounting groove, 7I, 7J...Wiring Groove, 8...Joint member, 9
... Negative pressure pipe, 10, 11 ... Liquid detection sensor, 1
2, 13, 15...Signal line, 14...Insertion detection sensor, 16...Negative pressure chamber, 17...Diaphragm,
19... Photo interrupter, 20... Shielding plate, 2
1...Bubble detection sensor.

Claims (1)

[Scope of utility model registration request] A refueling nozzle consisting of a nozzle body in which a flow path having a valve mechanism is formed therein, and a discharge pipe that protrudes from the nozzle body so as to communicate with the flow path and is inserted into the refueling port, wherein the discharge pipe A notched groove formed at the open end of the distal end and an inner surface of the dispensing pipe at a position corresponding to the notched groove are attached to the discharging pipe distal end side, and the oil liquid rising up while being isolated from the liquid flow path of the discharging pipe is provided. A sensor mounting case is provided with a liquid guide space having a front opening that can be entered, and a sensor mounting case is provided in a direction orthogonal to the liquid flow path of the discharge pipe in order to detect the oil rising in the liquid guide space. A liquid detection sensor consisting of a pair of light emitting element and light receiving element provided facing each other across the liquid guide space; A refueling nozzle comprising an insertion detection sensor comprising a photodetection element provided in a sensor mounting case facing into the liquid space.