JPH04352700A - Oil feed nozzle - Google Patents

Abstract

PURPOSE:To identify the kind of oil at the time of oil feeding by removing the remaining vapor from a vapor suction pipe and a gas sensor when the oil is not being fed. CONSTITUTION:An oil feed nozzle which comprises a vapor suction pipe 48 with the one end thereof open to the end of a cylindrical part 12 and the other end thereof connected with a vapor suction pump 32 and a gas sensor 43 and a switching valve 50 adapted to open the inside of the vapor suction pipe 48 to atmospheric air with a lever 25 released to stop oil feed arranged at the intermediate places along the vapor suction pipe 48 in that order from the side of the vapor suction pipe 32, the remaining vapor being discharged into the vapor suction pipe 48 and the gas sensor 43 during non-oil feed period.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refueling nozzle having a function of automatically determining the type of fuel oil based on vapor in an automobile fuel tank and preventing erroneous refueling.

0002

2. Description of the Related Art There are two main types of fuel oil for automobiles: gasoline and diesel oil, and if the wrong type of fuel oil is used, it will cause serious problems to the engine.

For this reason, prior to refueling, the vapor in the automobile fuel tank is guided to a gas sensor installed in the main body of the refueling device through a vapor suction pipe whose one end opens at the tip of the refueling nozzle, and the type of vapor is detected by the gas sensor. Japanese Patent Laid-Open Publication No. 2-109897 discloses a refueling device that detects the type of oil in an automobile fuel tank and determines the type of oil in an automobile fuel tank.

[0004] Also, the present applicant has filed Japanese Patent Application No. 2-15049.
According to No. 4, the gas sensor and vapor suction pump are installed inside the grip of the refueling nozzle to shorten the length of the vapor suction pipe, thereby shortening the time required for vapor to reach the gas sensor from the opening, and therefore the time required to determine the type of fuel oil. With the aim of
We have proposed a refueling nozzle that improves workability by shortening the waiting time before refueling starts and reducing the capacity of the vapor suction pump.

[0005]

According to the above-mentioned prior art, the type of oil in the fuel tank is determined by guiding the vapor in the fuel tank to the gas sensor through the vapor suction pipe by suction by the vapor suction pump. After oil type determination, even if the air from the vapor suction pump is exhausted and scavenged, some vapor may remain in the vapor suction pipe and gas sensor, and oil type determination may not be performed properly during the next refueling. There is a risk.

Therefore, it is an object of the present invention to provide a refueling nozzle that can ensure proper oil type discrimination by completely eliminating residual vapor in the vapor suction pipe and gas sensor before the oil type is discriminated during the next refueling. There is a particular thing.

[0007]

[Means for Solving the Problems] The refueling nozzle of the present invention which achieves the above object has a vapor suction pipe line whose one end opens at the tip of the cylinder tip and whose other end connects to a vapor suction pump, and a vapor suction pipe from which the opening connects to the vapor suction pump. The vapor suction pipe has a gas sensor disposed in order from the vapor suction pump side in the middle of the vapor suction pipe leading to the vapor suction pipe, and a switching valve that opens the inside of the vapor suction pipe to the atmosphere when refueling is not performed.

[0008]

[Operation] When not refueling, the inside of the vapor suction pipe is opened to the atmosphere by the switching valve, and the remaining vapor in the vapor suction pipe and gas sensor is released before the oil type is determined during the next refueling, making it possible to properly determine the oil type. Make it.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a refueling nozzle according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic explanatory diagram of a refueling device using a refueling nozzle according to the present invention, and reference numeral 1 in the figure is a control device. A predetermined oil type is registered in the control device 1, and the pump motor M is operated only when a detection signal from a gas sensor 43 provided in the oil supply nozzle 11, which will be described later, matches the registered oil type. , drives the fuel pump 4 to forcefully feed fuel oil to the fuel nozzle 11 via the flow meter 5 and hose 3. Furthermore, if the detection signal from the gas sensor 43 does not match the already registered oil type, the pump motor M is not activated, but the alarm 2 is activated to alert the operator, thereby preventing erroneous refueling. ing. A signal transmission cable 7 is attached to the hose 3 to transmit signals to the control device 1.

[0011] Reference numeral 6 in the figure indicates a flow rate pulse transmitter that transmits the flow rate detected by the flow meter 5 to the control device 1;
8 is a nozzle switch, 9 is an indicator, and 10 is a nozzle hook that locks the refueling nozzle 11 when not in use.

Next, the oil supply nozzle 11 will be explained with reference to FIG. 2, which is a cross-sectional side view thereof, and FIG. 3, which is a cross-sectional view taken along line II in FIG. 2.

[0013] The refueling nozzle 11 has a cylinder tip portion 1 made of a pipe.
2, the air flow path support member 14, and the valve seat member 1 of the valve device 15.
The nozzle main body 13 is formed into a substantially cylindrical shape by connecting the nozzle body 6 and the cylinder body part 23, and the grip part 58 connected to the cylinder body part 23 as the main parts.

The tip 24a is placed inside the tube tip 12.
A thin air flow pipe 24 opened on the lower side of the air flow path 2 is inserted, and the other end of the flow pipe 24 is connected to the center of the air flow path support member 14 .

The air flow path support member 14 and the valve device 15 are provided in the first half of the nozzle body 13, an inlet 26 connected to the hose 3 is provided on the side of the center portion, and an automatic valve closing device 27 is provided in the second half. .

The valve device 15 has a check portion 17 and a main valve 19, and the check valve 17 is supported by a spring 18 so as to come into pressure contact with a negative pressure generating portion 16a formed in a tapered shape on the downstream side of the valve seat member 16. It is biased and slidably attached to the channel support member 14 .

The main valve 19 of the valve device 15 includes a valve body 20 and a valve rod 21 integrally connected to the valve body 20.
The cylinder body 2 is reciprocally movable toward and away from a valve seat 16b formed on the upstream side of the valve seat member 16 opposite to the check valve 17.
3 and further formed in the valve rod 21 is a hollow part 22
A lever 25 is fitted into the barrel 23 so as to be pivotable.

As shown in FIG. 3, the roll pin 29 engages with the notch 28a of the push rod 28 and the notch 21a of the valve rod 21, so that the valve rod 21 and the push rod 28 are integrated, so when the lever 25 is pulled, The back portion 25a pushes the push rod 28, so that the valve rod 21 moves to the right in the drawing, and the main valve 19 opens.

A cap 30 is fitted on the right side of the valve rod 21 in the figure, and the outer peripheral edge 30a of the cap 30 is in sliding contact with the inner peripheral surface 31a of a cylindrical spring chamber 31 formed at the end of the cylinder body 23. A vapor suction pump 32, which will be described later, is formed, and a spring 33 is inserted inside to hold the push rod 28 at a position where the left end of the push rod 28 comes into contact with the back 25a of the lever 25.

A spring 34 stronger than the spring 33 is inserted between the flange 30b and the lid 35 of the spring chamber 31 on the outside of the cap 30, and the main valve 19 closes the valve rod 21 by the spring 34. It is biased to the left.

The reference numeral 36 shown in FIG. 2 is a U-shaped frame into which the roll pin 29 is fitted into the slit 36a, as shown in a perspective view in FIG. It is fixed to the diaphragm 38 by a pin 39.

In the negative pressure chamber 37, a diaphragm 38 is constantly pressed downward in FIG. A spring 40 is provided which acts on the.

[0023] Thus, the valve rod 21, the push rod 28,
Roll pin 29, U-shaped frame 36, diaphragm 38
, negative pressure chamber 37, etc., constitute an automatic valve closing device 27.

The flow path 41 shown in FIG. 3 is a flow path that connects the negative pressure generating section 16a and the negative pressure chamber 37, and the flow path 41 connects the air flow path through the flow path 14a of the air flow path support member 14. It communicates with the pipe 24.

A gas sensor 43 is provided in the cylinder body 23 of the refueling nozzle 11, and the sensor 43 includes a chamber 44 consisting of a cylindrical container extending in the direction of the cylinder tip, and an ultrasonic transducer 45 housed in the rear end of this chamber 44. An opening 47 is formed near the sealing part 46 at the tip of the chamber 44 and communicates with a vapor suction port 48a that opens near the tip of the cylinder tip 12 via a vapor suction conduit 48. Further, a through hole 44a is bored in the chamber 44 near the ultrasonic transducer 45, and the spring chamber 31 and the cap 30 are connected to each other.
Exhaust port 3 of vapor suction pump 32 formed by etc.
2a via a communication path 49. Further, a small hole 44b is bored in the circumferential surface of the chamber 44 located near the transducer 45, and communicates with the atmosphere.

FIG. 5 shows a signal processing circuit of the gas sensor 43, and reference numeral 51 in the figure is a timing signal generation circuit,
It is configured to operate the high frequency oscillation circuit 52 at a constant period T to generate pulsed high frequency power, excite the ultrasonic transducer 45 in the gas sensor 43, and input the echo signal to the determination circuit 54. The determination circuit 54 determines the type of vapor based on the data stored in the storage circuit 55 based on the time ΔT until the echo signal is received with reference to the signal from the timing signal generation circuit 51. It is. In addition, the number 56 in the figure
is a microswitch that is attached to the cylinder body 23 and activates the signal processing circuit of the gas sensor 43 in conjunction with the operation of the lever 25.

Further, in the middle of the vapor suction pipe 48, as shown in FIGS. 2 and 3, there is a protruding piece 25 that protrudes from the lever 25 when the lever 25 is not pulled, that is, when no oil is supplied.
A switching valve 50 is provided which opens the inside of the vapor suction pipe 48 to the atmosphere by means of the switch 50b, and stops the opening to the atmosphere when the lever 25 is pulled.

Next, FIG. 6 shows the operation of the device constructed in this way.
This will be explained according to the flowchart shown in .

In step a, the refueling nozzle 11 is removed from the nozzle hook 10, and when the nozzle switch 8 is turned on, the indicator 9 is reset to zero in step b.

[0030] In this state. When the refueling nozzle 11 was inserted into the refueling port of the automobile and the lever 25 was pulled, the protruding piece 25b provided on the lever 25 swung, and the swinging of the protruding piece 25b opened the vapor suction pipe 48 to the atmosphere. The switching valve 50 is switched to a state where opening to the atmosphere is stopped. Along with the switching of the switching valve 50, the back part 25a of the lever 25 is connected to the push rod 2.
8. Move the valve rod 21 to the right via the roll pin 29. Therefore, the main valve 19 opens against the biasing force of the spring 34, and the cap 30, which serves as the piston of the vapor suction pump 32, moves backward while expelling the air in the spring chamber 31. As a result, the pressure inside the front chamber of the spring chamber 31 becomes negative, and the vapor suction line 48 opened at the tip of the cylinder tip 12 causes the vapor in the fuel tank to flow into the chamber 44 of the gas sensor 43 via the switching valve 50. At the same time, the microswitch 56 is activated by the protruding piece 25b protruding from the lever 25 (step c).

The timing signal generation circuit 51 of the signal processing circuit of the gas sensor 43 is activated by the operation of the microswitch 56.
A signal is generated from the high frequency oscillation circuit 5.
High frequency power is output from 2. As a result, a pulsed ultrasonic beam is emitted from the ultrasonic transducer 45 within the gas sensor 43. This ultrasonic beam propagates through the space within the chamber 44 at a sonic speed determined by the vapor atmosphere within the chamber 44, is reflected by the wall surface of the sealing portion 46, and returns to the transducer 45 again at a sonic speed determined by the atmosphere within the chamber 44. The transducer 45 outputs an echo signal when the reflected ultrasonic waves arrive. This echo signal is input to the determination circuit 54. The determination circuit 54 compares the time from when the ultrasonic beam is emitted to when the echo signal is received and the data in the memory circuit 55 to determine the components constituting the atmosphere (step d).

In the following step e, if it is determined that the type of oil matches the pre-registered oil type, the pump motor M is operated in the next step f. This causes pump 4
The fuel oil discharged from the flowmeter flows into the fuel supply nozzle 11 via the flowmeter 5, displaces the check valve 17 to the left in the figure against the spring 18, and flows from the gap to the cylinder tip 12. The fuel is then refilled into the car's fuel tank.

During refueling into the fuel tank, in the negative pressure generating portion 16a formed by the check valve 17 of the valve device 15 and the valve seat member 16, the flow path 14a is closed due to the venturi effect.
Air is sucked in from the tip 24a of the air flow pipe 24 at the tip of the barrel tip 12 through the tube.

On the other hand, the control device 1 counts the flow rate pulses output from the flow rate pulse transmitter 6 and displays them on the display 9 as the amount of oil supplied. If the tip 24a of the air flow pipe 24 is blocked by bubbles generated as the liquid level in the automobile tank rises, the inflow of air from the air flow pipe 24 is blocked, so that the air flow pipe 24 is connected through the flow path 41. The negative pressure chamber 37 that is currently in operation becomes negative pressure.

Therefore, the diaphragm 38 is pulled upward from below against the spring 40, and this diaphragm 38
The roll pin 29 connected by the frame 36 is also pulled upward, and the roll pin 29 comes out from the notch 28a of the push rod 28. Therefore, the engagement relationship between the push rod 28 and the valve rod 21 is released, the valve rod 21 compresses the spring 33 by the spring 34, and returns to the initial state together with the roll pin 28, and the main valve 19 closes, stopping oil supply. .

As the main valve 19 moves, the cap 30, which serves as the piston of the vapor suction pump 32, also moves to its original position, thereby forcing the air in the spring chamber 31 into the chamber 44 of the gas sensor 43 through the passage 49. chamber 44
The vapor inside and the vapor suction pipe 48 is removed from the vapor suction port 4.
8a, the chamber 44 and the vapor suction pipe 4.
Forcibly scavenge the air inside 8.

[0037] When the lever 25 is released, the lever 25
The switching valve 50 is switched to open the inside of the vapor suction pipe 48 to the atmosphere by the swinging of the protruding piece 25b provided in the vapor suction pipe 48, and the inside of the vapor suction pipe 48 and the gas sensor 43 connected to the vapor suction pipe are naturally scavenged. be in a state where you can get it. Furthermore, the movement of the push rod 28 by the lever 25 is released;
A spring 33 in the cap 30 returns the push rod 28 to its original position as shown in FIG. Since the notch 28a of the push rod 28 returns to its original position, the roll pin 29 also retracts into the notch 28a, and as shown in FIG.
It returns to the initial state connected via . In the figure, 57 is a locking metal fitting for maintaining the lever 25 in a pulled state.

After the above operations, when the refueling nozzle 11 is locked to the nozzle hook 10, the nozzle switch 8 is turned off in step g, and the pump motor M is stopped in step h. On the other hand, if the sensor output differs from the pre-registered oil type, the control device 1 activates the alarm 2 in step i to notify the operator that the oil type is different, and when the operator realizes the mistake, turns on the refueling nozzle 11. When hung on the nozzle hook 10, the alarm 2 stops operating (steps j, k)
.

Therefore, when the lever 25 of the refueling nozzle 11 is returned to its non-refueling state, the switching valve 50 disposed in the vapor suction pipe 48 opens the vapor suction pipe 48 to the atmosphere, so that the vapor suction pipe 48 and The vapor remaining in the gas sensor 43 is released by the next time of refueling, and the oil type can be appropriately determined at the time of refueling without being affected by the residual gas.

FIG. 7 is a sectional side view showing another embodiment of the refueling nozzle according to the present invention. In FIG. 7, parts corresponding to the refueling nozzle shown in FIGS. 2 and 3 are designated by the same reference numerals, and a detailed explanation will be omitted, but a nozzle hook 1 of the refueling device main body that locks the refueling nozzle 11 when not refueling is shown.
A switching valve 50' is provided at a position that is operated by contacting the nozzle hook 10 when the valve is locked at 0, for example, the lever guard 59, and the switching valve 50' is connected to the middle of the vapor suction pipe 48 through a branch pipe 60. Then, attach the refueling nozzle 11 to the nozzle hook 1
0, the switching valve 50' is switched to open the vapor suction pipe 48 and the gas sensor 43 connected to the vapor suction pipe 48 via the branch pipe 60 to the atmosphere. Therefore, by locking the refueling nozzle 11 to the nozzle hook 10 when not refueling, the vapor suction pipe and the gas sensor 43
The residual vapor in the tank is released from the switching valve 50' via the branch pipe 60 before the next refueling, and oil type discrimination at the time of refueling can be appropriately performed without being affected by the residual vapor.

[0041] In the above description, an embodiment has been described in which an ultrasonic gas sensor is used as a gas sensor to detect the type of fuel oil, but it is also possible to use a combustion type or optical type gas sensor to detect the type of gas. It is.

[0042]

Effects of the Invention According to the refueling nozzle of the present invention, a gas sensor and a gas sensor are installed in the vapor suction pipe line, which has one end open at the tip of the cylinder tip and the other end connects to the vapor suction pump, in order from the vapor suction pump side. By installing a switching valve that opens the inside of the vapor suction pipe to the atmosphere during refueling, residual vapor in the vapor suction pipe and gas sensor is released through the switching valve when not refueling, so that the vapor suction is completed before the next refueling. This has the effect of eliminating residual hepa in the pipe line and gas sensor, and ensuring proper oil type discrimination by the gas sensor.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a refueling device using a refueling nozzle according to the present invention.

FIG. 2 is a cross-sectional side view showing an embodiment of a refueling nozzle according to the present invention.

FIG. 3 is a sectional view taken along line II in FIG. 2;

FIG. 4 is an explanatory perspective view of a frame and a roll pin used in the refueling nozzle.

FIG. 5 is a block diagram illustrating a signal processing circuit used in the control device for the refueling device in this embodiment.

FIG. 6 is a flowchart showing the operation of the present oil supply device.

FIG. 7 is a cross-sectional side view showing another embodiment of the refueling nozzle according to the present invention.

[Explanation of symbols]

10...Nozzle hook 11...Refueling nozzle 12...Cylinder tip 32...Vapor suction pump 43...Gas sensor 48...Vapor suction pipe 50...Switching valve

Claims (1)

[Claims] Claim 1: A vapor suction pipe whose one end opens at the tip of the cylinder tip and whose other end connects to the vapor suction pump, and which are arranged in order from the vapor suction pump side in the middle of the vapor suction pipe from the opening to the vapor suction pump. A refueling nozzle characterized by having a gas sensor and a switching valve that opens the inside of a vapor suction pipe to the atmosphere when refueling is not performed.