JPH054693A - Oil supply nozzle - Google Patents

Abstract

PURPOSE:To suck only vapor irrespective of a liquid level of an automobile fuel tank. CONSTITUTION:In an oil supply nozzle comprising a body 53 housing a main valve 52 which is operated by an oil supply lever 50, a cylinder head 51 connected to the body 53 and a stop valve 55 connected to the oil supply lever for opening/closing a flow path of an air tube 14 with one end connected to an oil type identification means, a vapor suction/exhaust port 54 is provided at a rear end of the nozzle cylinder head 51. Thus the vapor suction/exhaust port 54 is communicated to an atmosphere irrespective of a liquid level of an automobile fuel tank, so that fuel can be prevented from flowing into the air tube 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refueling nozzle suitable for a refueling device that sucks vapor in a vehicle fuel tank and automatically determines the type of fuel oil.

[0002]

2. Description of the Related Art There are two types of automobiles, one that uses gasoline as the fuel and the other that uses light oil. If an incompatible fuel is used, the engine will be seriously hindered. Therefore, prior to refueling, the vapor in the vehicle fuel tank was sucked up by the gas sensor to determine the oil type in the fuel tank, and the type of oil to be used in the vehicle matched the type of fuel oil to be refueled. There has been proposed an oil supply device capable of discharging fuel only in some cases (Japanese Patent Laid-Open No. 1-199900).

In such a refueling device, usually, a gas sensor for determining the type of oil based on vapor is provided in the refueling device main body, and the gas sensor and the vapor intake / exhaust port of the refueling nozzle are connected by an air tube. Therefore, the explosion-proof treatment for the gas sensor is made easy. Therefore, the length of the conduit from the tip of the air tube to the gas sensor becomes long, and the timing of determining the sensor output becomes an important issue. That is, the difference between gasoline and light oil is that the vapor concentration of the fuel tank containing gasoline is higher than that of the tank containing light oil. The output signal from the gas sensor is taken in at the time when the time that will reach the gas sensor has elapsed from the time when sampling was started.

For this reason, in order to output a clear signal at the time when sampling is started and to avoid complication of the operation, as shown in FIG. 8, the nozzle body A is interlocked with the refueling lever B. Attach the mechanical switching valve C that operates,
The vapor intake / exhaust port E provided at the tip of the cylinder tip portion D of the nozzle is connected to the air tube F via the switching valve C. According to such a structure, the switching valve C is pulled by pulling up the refueling lever B in a state where the cylinder tip portion D of the nozzle is inserted into the fuel tank of the vehicle prior to refueling.
Is opened by the lever B, whereby the vapor in the vehicle fuel tank is sucked from the vapor intake / exhaust port E. When the vapor is sucked, the pressure in the air tube F rises. Therefore, the time when this pressure rises is detected by the pressure switch provided in the main body of the oil supply device, and after a certain time, the signal from the gas sensor is taken in. Determine the type of oil,
After the determination, the air is fed into the air tube F to perform the scavenging operation.

[0005]

However, when the fuel is present in the fuel tank of the automobile close to the fuel filler port, or when the distance between the fuel filler port and the tank body is short as in a truck or a motorcycle, the fuel oil is replenished. When the nozzle is inserted in an attempt, the vapor intake / exhaust port E provided at the tip of the nozzle is blocked by the fuel oil, and when the refueling lever B is pulled up, the fuel oil is directly sucked by the negative pressure.
The air tube F cannot suck gas such as vapor, so that the pressure rise in the air tube does not occur. Therefore, the vapor sampling suction pump continues to operate and the fuel oil is sucked into the air tube F, which causes a problem that the gas sensor is immersed in the fuel oil and damaged.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent the fuel oil from being sucked into the air tube regardless of the liquid level of the vehicle fuel oil and to prevent vaporization. An object of the present invention is to provide a novel oil supply nozzle capable of reliably sucking only oil.

[0007]

In order to solve such a problem, according to the present invention, a body portion accommodating a main valve operated by an oil supply lever, a cylinder tip portion connected to the body portion, and one end are In addition to opening and closing the flow path of the air tube connected to the oil type determination means, with a stop valve that interlocks with the refueling lever, the suction port of the stop valve is opened to the rear of the cylinder tip portion. .

[0008]

[Function] Even if the vehicle fuel tank is filled with almost full amount of fuel oil, the fuel is not filled with fuel oil. Since the vapor intake / exhaust port is located behind the cylinder tip of the refueling nozzle, the air tube is Inhale air. Therefore, when the liquid level of the vehicle fuel tank is low, the vapor in the vehicle fuel tank is sucked through the nozzle cylinder tip. In addition, even if the liquid level of the automobile fuel tank rises to near full and the cylinder tip is blocked, the vapor intake / exhaust port still communicates with the nozzle cylinder tip space, so the air Is sucked in, and the pressure in the air tube rises.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an example of an oil supply device to which the oil supply nozzle of the present invention is applied. In the drawing, reference numeral 1 is an oil supply pump driven by a pump motor 2, and a flow meter 3 is provided at a discharge port. A nozzle hose 4 is connected to feed fuel oil from an underground tank to the refueling nozzle 5. The flowmeter 3 is provided with a flow rate pulse transmitter 6, and a signal from this is displayed by the control device 7 on the display 8 as the amount of refueling.

Reference numeral 10 in the drawing is a negative pressure / positive pressure generating means for sucking the vapor of the vehicle fuel tank and generating air for scavenging the sucked vapor. In this embodiment, it is constituted by a diaphragm pump and is switched. A pressure switch 12 and a gas sensor 13 are connected via a valve 11.
The gas sensor 13 is connected to the switching valve 55 of the refueling nozzle 5 described later by the air tube 14. The control device 7 receives signals from the pressure switch 12 and the gas sensor 13, and the pressure switch 12 causes the air tube 14 to move.
The output of the gas sensor 13 is taken after a certain time from the time when the pressure rises and the oil type of the vehicle fuel tank is determined, and after the determination is completed, the flow path is switched by the switching valve 11 to supply the scavenging air. Is configured. Reference numeral 17 in the figure denotes a motor for driving the negative pressure / positive pressure generating means 10.

FIG. 2 shows an embodiment of the vapor sampling mechanism centering on the above-mentioned negative pressure / positive pressure generating means 10. In the figure, reference numeral 20 is a positive displacement pump using a diaphragm and a pump case. A diaphragm 24 is provided so as to divide 21 into the first and second pump chambers 22 and 23, and intake valves 25 and 26 and exhaust valves 27 and 28 are provided in each pump chamber 22 and 23. Diaphragm 24
Is connected to one end of an external operating rod 30 via an elastic seal member 29, and is reciprocated by a reciprocating motor 17 connected to the other end of the operating rod 30.

The first pump chamber 22 is connected to the intake valve 25 via the conduit 31 to the 3-port / 2-position switching valve 11 and the relief valve 33 to the intake valve 26 of the second pump chamber 23. The exhaust valve 27 is communicated with the air ejection port 36 of the nozzle housing recess 35 via the conduit 34. The second pump chamber 23 is connected to the intake valve 26 via the filter 37 and the air intake 38, and the exhaust valve 28 is connected to the 3 port / 2 position switching valve 11 via the conduit 39.
A relief valve 40 is connected between 7 and 28.

The switching valve 11 normally moves to the a position, and when biased to the b position, connects the conduit 31 to the gas sensor 13 at the a position, and moves to the second position at the b position. The exhaust valve 28 of the pump chamber 23 is connected to the gas sensor 13.

Reference numeral 14 is an air tube provided along the refueling hose 4, one end of which is connected to the gas sensor 13 and the other end of which is connected to a stop valve 55 which is interlocked with the refueling lever 50 as shown in FIG. , From here the nozzle tip 5 at the rear end of the tip
1 is connected to a vapor intake / exhaust port 54 provided at a location communicating with 1.

FIG. 3 shows an embodiment of the fueling nozzle of the present invention, in which the main valve 52 is opened by pulling up the fueling lever 50 and sends the fuel oil of the fueling hose 4 to the cylinder tip portion 51. A vapor intake / exhaust port 54 is provided in the vicinity of the body portion 53, that is, in the rear of the cylinder tip portion 51. Reference numeral 55 is a stop valve provided with a check valve 55a for opening and closing the flow path between the air tube 14 and the vapor intake / exhaust port 54, and the check valve 5 is provided when the operating rod 56 is ejected (position a).
5a closes the valve, and when the operating rod 56 is pushed in by the refueling lever 50 (position b), the flow path is opened.

Next, the operation of the apparatus configured as described above will be described in the fourth section.
As shown in the figure, description will be made based on the flowchart.
Nozzle 5 is removed from the nozzle hook and the nozzle switch SW
When is turned on (step y), the control device 7 resets the display 8 to zero and operates the motor 17 of the negative pressure / positive pressure generating means 10 at high speed (step b). As a result, the negative pressure generated in the first pump chamber 22 acts on the gas sensor 13 and the air tube 14 through the conduits 31 and 41. At this point, the refueling lever 50 is still pulled down,
Since the stop valve 55 is in the a position, the air tube 14 is closed, a large negative pressure acts on the air tube 14, the pressure switch 12 is turned on, and a signal is output (step C).

In this state, when the cylinder tip portion 51 of the refueling nozzle 5 is inserted into the fuel tank of the automobile and the nozzle lever 50 is pulled up, the main valve 52 opens, and at the same time, the stop valve 55 interlocks with the lever 50 and is in the b position. And the sampling channel is opened. As a result, the vapor in the fuel tank flows into the air tube 14 from the vapor intake / exhaust port 54, the pressure of the air tube 14 rises, and the pressure switch 12 is turned off.
It becomes FF (Stepni). The control device 7 detects from the signal from the pressure switch 12 that sampling has started.

The vapor in the vehicle fuel tank is sucked by the negative pressure / positive pressure generating means 10 and flows into the gas sensor 13, and the output from the gas sensor 13 rises with time. By the time the predetermined time ΔT1 elapses, the vapor intake / exhaust port 5
If 4 does not get blocked by the liquid and pressure rise,
(E) F) The control device 7 takes in the signal from the gas sensor 13 (step) and compares it with the predetermined concentration data for each fuel oil.

That is, when the fuel oil is gasoline,
Since the concentration of the organic gas component in the fuel tank is high, a signal indicating a high concentration is output from the gas sensor 13, and since the light oil has a higher boiling point than gasoline, the concentration of the organic gas component in the fuel tank is low and the gas sensor A signal indicating a low density is output from 13.

As a result of this comparison, if it is clearly judged to be gasoline or light oil (step H), and if it matches the oil type registered in this refueling nozzle (step S), the switching valve 11 is set to the b position. To supply the air from the exhaust valve 28 of the second pump chamber 23 to the air tube 14, operate the motor 17 at a low speed, and operate the oil supply pump 1 to start oil supply (step N). The air from the exhaust valve 28 of the negative pressure / positive pressure generating means 10 passes through the gas sensor 13, the air tube 14, and the nozzle 5
Flowing into the vapor intake / exhaust port 54 to scavenge the sampling flow path to prevent deterioration of the gas sensor 13 and prevent fuel oil from flowing into the vapor intake / exhaust port 54 during refueling.

When the amount of refueling reaches a predetermined amount, the nozzle lever 50
Is lowered, the main valve 52 is closed and refueling is stopped,
The switching valve 55 that interlocks with the lever 50 moves to the a position and is connected to the check valve 55a.

When the nozzle 5 is returned to the nozzle hook and the nozzle switch SW is turned off (step), the oil supply pump 1 is stopped and the negative pressure / positive pressure generating means 10 is operated at high speed (step). During the predetermined time ΔT2, the negative pressure / positive pressure generating means 10 continues to operate at high speed (step
Wa). As a result, air flows from the exhaust valve 28 of the second pump chamber 23 into the vapor intake / exhaust port 54 at the rear end of the nozzle cylinder tip 51, and the scavenging of the sampling flow path and the nozzle cylinder tip 5 is performed.
The fuel oil adhering to No. 1 is removed for a predetermined time Δ
When T2 has passed, the motor 17 is stopped and the switching valve 11
Returns to the original position (step power).

On the other hand, when the refueling nozzle 5 is inserted into the fuel tank of an automobile which is already full and the refueling lever 50 is pulled up, the stop valve 55 is opened and the negative pressure from the air tube 14 is changed to the vapor suction / exhaust port. 54 will be acted upon. Needless to say, the nozzle cylinder tip portion 51 is not filled with the fuel oil before the refueling is started, and stores the air including the vapor.

As a result, the vapor in the nozzle tip portion 51 flows into the air tube 14 from the vapor intake / exhaust port 54, the pressure of the air tube 14 rises, and the pressure switch 12 is turned off (step d). The control device 7
The signal from the pressure switch 12 detects that sampling has started.

A predetermined time Δ from the start of sampling
When the vapor in the cylinder tip portion 51 is completely sucked by the time T1, the vapor intake / exhaust port 54 is blocked with the liquid, the pressure of the air tube 14 drops, and the pressure switch 12 is turned on (step E). , The switching valve 11 and the conduit 39
To communicate with the air tube 14 to generate negative pressure / positive pressure 1
While the motor 17 of 0 is running at a low speed, an alarm device (not shown) is activated (step yo) to prompt confirmation of safety.

Upon notification, the nozzle 5 is returned to the nozzle hook and the nozzle switch SW is turned off (step
), The notification is stopped, the motor 17 is operated at high speed (step step), and the steps following step (wa) are executed.

When it is not possible to clearly determine whether gasoline or light oil as a result of the oil type determination (step H), or when it is determined as a different oil type as a result of the oil type determination (step S)
I), the switching valve 11 is switched to connect the conduit 39 to the air tube 1
4, the alarm 17 (not shown) is operated in a state where the motor 17 of the negative pressure / positive pressure generating means 10 is operated at a low speed (step Y) to prompt confirmation of the oil type.

In this embodiment, the pressure switch 1
Although the increase in the pressure of the air tube 14 is determined by the method shown in FIG. 2, the load current of the motor 17 that drives the negative pressure / positive pressure generating means 10 causes the switching valve 55 to be in the closed state (T1) as shown in FIG. ) To the open state (T2), the pump load becomes smaller and the load current of the motor 17 sharply decreases by ΔI. Therefore, the sampling start time can be known by detecting this decrease.

FIG. 6 shows a second embodiment of the fueling nozzle, and reference numeral 60 in the drawing is provided in a vapor intake / exhaust port 61 and a nozzle body 53 formed at the tip of the nozzle barrel tip 51. A vapor suction pipe for connecting the stop valve 55, which is disposed inside the cylinder tip portion 51 and has a long groove 63 formed at a predetermined distance from the body portion 53 as shown in FIG.

In this embodiment, the nozzle cylinder tip portion 51 is inserted into the fuel tank of the automobile with a small remaining amount, and the refueling lever 5 is inserted.
When 0 is pulled up, the stop valve 55 is opened and the negative pressure acts on the vapor suction pipe 60. The vapor in the automobile fuel tank is sucked from the vapor intake / exhaust port 61 provided at the tip of the cylinder tip portion 51 and the long groove 63 of the vapor suction pipe 60 and sent to the gas sensor 13 to judge the fuel oil in the tank. Done.

On the other hand, when the nozzle barrel tip portion 51 is inserted into an automobile fuel tank in which fuel oil exists near the fuel filler port,
The nozzle cylinder tip portion 51 is immersed in fuel oil, and the vapor intake / exhaust port 61 located at the tip of the cylinder tip portion 51 is also blocked by the fuel oil.

When the refueling lever 50 is pulled up in this state,
The stop valve 55 is opened and a negative pressure acts on the vapor suction pipe 60. However, since the long groove 63 of the vapor suction pipe 60 communicates with the space existing in the oil supply nozzle barrel tip portion 51, the vapor in this space is sucked. As a result, the pressure of the air tube 14 rises, and the start of sampling is determined.

FIG. 7 shows a third embodiment of the oil supply nozzle, in which reference numeral 70 is provided along the surface of the cylinder tip portion 51 from the stop valve 55 to the tip of the nozzle cylinder tip portion 51. The vapor suction tube thus formed has a long groove 71 formed in the axial direction as shown in FIG. 6B as in the embodiment shown in FIG.

In this embodiment, when the refueling nozzle is inserted into the vehicle fuel tank with a small remaining amount and the apparatus is operated, the vapor in the tank is sucked from the tip opening 70a of the vapor suction pipe 70 and the long groove 71. Gas sensor 13
It is sent to and used for the judgment of fuel oil in automobile fuel tanks.

On the other hand, even if the refueling nozzle 5 is inserted into the fuel tank of an automobile in which fuel oil is present near the refueling port of the tank, the long groove 7 near the nozzle body portion 53 of the vapor suction pipe 70 is inserted.
Since No. 1 is still in communication with the atmosphere, it will suck in air including vapor in the vicinity of the fuel filler port of the automobile fuel tank. This prevents the fuel oil in the vehicle fuel tank from being sucked.

According to this embodiment, it is possible to increase the effective cross-sectional area of the nozzle cylinder tip portion for passing the fuel oil.

[0037]

As described above, in the present invention,
The main body that houses the main valve operated by the refueling lever, the cylinder tip that connects to the main valve, and the air tube flow path that has one end that connects to the oil type determination means are opened and closed, and the stop that works in conjunction with the refueling lever is opened and closed. With a valve, the suction port of the stop valve is extended to the vicinity of the body, so that the air tube is in communication with the atmosphere regardless of the liquid level of the vehicle fuel tank, and the fuel oil is judged when determining the oil type. It is possible to reliably suck the vapor in the vehicle fuel tank while preventing the vapor from being sucked.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an oil supply apparatus to which an oil supply nozzle of the present invention is applied.

FIG. 2 is a configuration diagram showing an embodiment of a sampling device of the same device.

FIG. 3 is a cross-sectional view showing an embodiment of the oil supply nozzle of the present invention.

FIG. 4 is a flowchart showing the operation of the above apparatus.

FIG. 5 is a motor load current characteristic diagram for showing another embodiment of the present invention.

FIG. 6A is a sectional view showing a second embodiment of the oil supply nozzle of the present invention, and FIG. 6B is a perspective view showing a vapor suction pipe.

FIG. 7A is a sectional view showing a third embodiment of the oil supply nozzle of the present invention, and FIG. 7B is a perspective view showing a vapor suction pipe.

FIG. 8 is a cross-sectional view showing an example of a conventional oil supply nozzle. 1 oil pump 2 motor 3 flow meter 4 nozzle hose 5 nozzles 6 Flow pulse transmitter 7 Control device 10 Negative pressure / positive pressure generating means 12 Pressure switch 13 Gas sensor 14 air tubes 17 motor 50 Refueling lever 51 Nozzle cylinder tip 53 torso 54 Vapor intake / exhaust port

Claims (2)

[Claims] 1. A body part accommodating a main valve operated by an oil supply lever, a cylinder tip part connected to the body part, and an air tube whose one end is connected to an oil type determination means. A refueling nozzle having a stop valve that interlocks with a refueling lever, wherein a suction port of the stop valve is opened rearward of the cylinder tip portion. 2. A body part accommodating a main valve operated by an oil supply lever, a cylinder tip part connected to the body part, and an air tube whose one end is connected to an oil type determination means, and the flow path of the air tube is opened and closed. An oil supply nozzle provided with a stop valve interlocking with an oil supply lever, wherein a suction port of the stop valve is extended to a tip of a cylinder tip portion by a pipe having a slit formed in a longitudinal direction.