JPH0223438B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a nozzle for a refueling device in which a refueling stop means is built into the main body of the refueling device.

[Prior Art] As is well known, the nozzle of a refueling device uses negative pressure generated by the flow of oil to block the air suction port at the tip of the nozzle as the oil level rises during refueling.
A diaphragm operates to automatically close the main valve and stop the supply of fuel. however,
The air suction port is also blocked by foam and droplets during refueling, and the diaphragm is activated to stop refueling, so the worker must manually operate the nozzle lever again to refuel. As a result, refueling efficiency was poor.

Therefore, the present applicant has developed a technique as described in Japanese Patent Application Laid-Open No. 58-52100, in which the nozzle lever is operated using power and the lever is returned to return the clutch. However, they required a power source such as electricity for power operation, and special safety measures were required when handling flammable liquids such as gasoline.

[Problems to be Solved] Therefore, an object of the present invention is to provide a nozzle for a refueling device that can automatically refuel to a "full tank" without requiring a special power source such as electricity.

[Means for Solving the Problems] According to the present invention, in the nozzle of the refueling device in which the refueling stop means is built into the main body of the refueling machine, a hydraulic valve that opens and closes the refueling passage by operating a nozzle lever is provided, and the hydraulic pressure of the hydraulic valve is The chamber is provided with one outflow port, a first inflow port, and a second inflow port, and a rod is provided that slides on a nozzle lever to open and close the outflow port and the first inflow port, When a lever is squeezed, the outflow port opens and the first inflow port closes,
In addition, a negative pressure generating means is provided in the nozzle flow path, one end of which communicates with the air suction port at the tip of the nozzle, and the other end of which communicates with a diaphragm chamber having a diaphragm operated by negative pressure. A member is provided for opening and closing the inlet, and the second inlet opens when the diaphragm is actuated and closes when the diaphragm returns.

[Operation] Therefore, when the nozzle lever is pulled, the outflow port opens, the first inflow port closes, and the hydraulic valve opens due to the pressure difference, allowing oil to flow. Conversely, if you return the nozzle lever, the hydraulic valve will close.

If the air intake port is blocked by bubbles or droplets during refueling, the diaphragm is operated by negative pressure and the hydraulic valve is closed, which is similar to the prior art, but in the present invention, the second inlet port is opened and closed. Since a member is provided on the diaphragm, when the diaphragm is actuated by negative pressure, the second outlet opens. When the bubbles and droplets disappear after refueling is stopped, the negative pressure is no longer generated, so the diaphragm returns to its original state, and the nozzle lever that closes the second inlet is pulled down, the first inlet is closed, and the outlet is opened. Therefore, when the refueling stop means of the refueling machine body is released and oil flows again, the oil in the hydraulic pressure chamber flows from the outlet, and the hydraulic pressure valve opens due to the differential pressure.

As described above, in the present invention, the hydraulic valve is controlled by a diaphragm that operates under negative pressure, a nozzle lever, and hydraulic pressure, so it does not require a special power source and can be used as a refueling nozzle for handling flammable liquids such as gasoline. Extremely safe.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows an oil supply system for carrying out the present invention, and the oil supply system, which is designated as a whole by reference numeral 1, has a pump 3 driven by a motor 4 that pumps oil from a tank (not shown) via a pipe 2. ing. The oil pumped up by the pump 3 then passes through the flow meter 5, the main valve 6, and the hose 7.
It is designed to flow into a refueling nozzle 8 provided at the tip of the refueling nozzle 8. And a pulse transmitter 9 provided in the flow meter 5
converts the flow rate into a pulse signal and sends the pulse signal to the control circuit 10, and the flow rate is digitally displayed on the display meter 11. This control circuit 10 will be described later, but it sends signals to the valve drive unit 12 of the main valve 6 and the motor drive unit 13 of the motor 4 to open and close the main valve 6 and stop driving the motor 4. In the figure, reference numeral 14 denotes a nozzle switch that emits a signal when the refueling nozzle 8 is hooked onto and removed from the nozzle hook.

When refueling with such a refueling device, as shown in FIG. 2, the nozzle portion 15 of the refueling nozzle 8 is inserted into the refueling port O of the fuel tank T of the automobile, and the lever 16 is pulled to refuel.

A liquid level sensor S is provided near the tip of the nozzle portion 15 to detect the liquid level in the tank T.
When the tank becomes "full," the main valve 6 closes to stop refueling.

However, in Figure 2, the liquid level is at level B.
Although the tank is "full" when it reaches the point,
During refueling work, for example, even if the liquid level is at level A, the liquid level sensor S detects the liquid level due to bubbling or splashing, and the main valve closes to stop refueling.

Then, after a certain period of time has passed after the liquid level sensor is activated and the main valve is closed, a valve open signal is issued from the control circuit 10 to the valve drive unit 12 of the main valve 6, and the refueling operation is started again. Repeat several times until the tank is full.

When carrying out the present invention, it usually takes 2 to 3 seconds for bubbles and droplets to disappear after stopping the refueling operation.
For example, the refueling operation is started again after 2 seconds. Also, the appropriate number of times to repeat the refueling operation is about three times.

FIG. 3 shows a refueling nozzle embodying the present invention.

In FIG. 3, the refueling nozzle 8 includes a main body 30, a passage 31 communicating with the hose 7 is formed at the rear end of the main body 30, and a nozzle portion 15 is attached to the front end thereof. Nozzle part 1
An air suction port 33 of a vacuum tube 32 constituting the liquid level sensor S is provided near the tip of the liquid level sensor S.
A check valve CV that opens with hydraulic pressure is provided on the front side of the main body portion 30, and a negative pressure generating portion 34 is formed at the valve seat of the check valve CV, and communicates with the vacuum pipe 32. A vacuum tube 32 is provided in the upper chamber 37 of the diaphragm 36 constituting the automatic closing mechanism.
The lower chamber 38 is in communication with the atmosphere through the hole 35.

Therefore, when the check valve CV is opened by hydraulic pressure during refueling work, negative pressure is generated in the negative pressure generating section 34 due to the flow of oil, but unless the air suction port 33 is blocked by oil, negative pressure is generated in the upper chamber 37. No pressure is transmitted. However, when the air suction port 33 is blocked with oil, a negative pressure is transmitted to the upper chamber 37, so that the diaphragm 36 moves upward against the spring 39 in FIG. Since the diaphragm 36 is integrally attached with a stem 40, which is a member that opens and closes a second inlet, which will be described later, the stem 40 also moves upward together with the diaphragm 36.

A hydraulic valve V is provided on the downstream side of the passage 31. This hydraulic valve V is connected to the lever 16 by a rod 42.
A valve body 43 is fitted to the rod 42. The valve body 43 is provided with a first inlet 44 communicating with the passage 31, and this first inlet 44 is connected to the rod 4.
2 moves downward relative to the valve body 43, it is closed by the rod 42, and when the rod 42 moves downward and the outlet 48 opens, the passages 46, 6 between the rod 42 and the valve body 43 are closed.
A lower chamber 56 and an upper chamber 47 of the valve body 43 communicate with each other through the valve body 43 .

Therefore, pull the lever 16 and lever hook piece 6
1, the rod 42 moves downward against the spring 49, closes the first inlet 44 and opens the outlet 48, and the oil in the lower chamber 56 passes through the passages 60 and 46 to the upper chamber 4.
7, the pressure difference between the upper side of the diaphragm 62 facing the passage 31 and the lower side of the diaphragm 62 facing the lower chamber 56 causes the valve body 4 to flow out.
3 moves downward against the spring 50, and the valve body 43 touches the valve seat 5.
1, the oil in the passage 31 flows into the upper chamber 47. This upper chamber 47 communicates with the chamber 52 upstream of the check valve CV, so that the oil pushes the check valve CV open and flows into the nozzle section 15. Now, a passage 53 is provided in the passage 31, and the passage 5
3 is provided with a passage 54 that communicates when the diaphragm 36 moves upward and the member that opens and closes the second inlet, that is, the stem 40 moves upward, and the passage 5
4 communicates with a lower chamber 56 of the valve body 43 at a second inlet 59 via a small valve 55, and the small valve 55 connects the passage 54 and the lower chamber 56 by operating an auxiliary lever 65. It is designed to open and close communication relationships.

Therefore, when the small valve 55 is open and the diaphragm 36 moves upward, that is, when the liquid level rises and the air suction port 33 is closed and negative pressure is transmitted to the upper chamber 37, the passage 31 is opened to the lower chamber. 56 and communicates with passage 6
0,46 flows from the passage 31 into the lower chamber 56 via the passage 53.54 than flows out from the lower chamber 56 into the upper chamber 47;
The valve body 43 is seated on the valve seat 51 by the action of the spring 50 and the hydraulic pressure flowing from the second inlet 59 through the passages 53 and 54, so that the valve body 43 is closed.

Next, an embodiment of the present invention will be described with reference to FIG.

In addition, if you want to stop refueling midway, press lever 1.
6 from the hooking piece 61, the rod 42 will release the spring 49.
The outflow port 48 is closed and the first inflow port 44 is opened, so that due to the hydraulic pressure flowing from the passage 31 into the lower chamber 56 through the first inflow port 44 and the force of the spring 50. Valve body 43 is closed.

In FIG. 4, the same components as those shown in FIGS. 1, 2, and 3 are designated by the same reference numerals.

First, remove the refueling nozzle 8 from the nozzle hook,
A signal from the nozzle switch 14 is transmitted to the motor control circuit 20 via the line L1, and the motor drive unit 13 is activated to rotate the motor 4 and drive the pump 3. At the same time, a valve opening signal is sent to the valve control circuit 21 via line L2, and as a result, the valve drive unit 12
is actuated to open the main valve 6. Furthermore, a reset signal is sent to the counting circuit 22 via the line L3, the previous oil supply amount is reset, and the display meter 11 returns to zero. Then, when the nozzle part 15 of the refueling nozzle 8 is inserted into the refueling port O of the car tank T, and the lever 16 is pulled and hooked onto the hook 61, the hydraulic valve V is opened by the hydraulic pressure as described above, and the refueling operation is performed. . Then, the pulse transmitter 9 of the flow meter 5 sends a pulse signal to the counting circuit 22 via the line L6 to be counted, and the flow rate is displayed on the display meter 11.

When the air suction port 33 of the vacuum pipe 32 is blocked by bubbles or droplets during refueling work, the negative pressure generated in the negative pressure generating section 34 is transmitted to the upper chamber 37 of the diaphragm 36, and as described above, the hydraulic valve V closes. However, since the lever 16 has been pulled down and the rod 42 is in the lower position, the outlet 48 above the rod 42 is open, and the lower chamber 56 and the upper chamber 47 are in communication. When the flow decreases, no negative pressure is generated in the negative pressure generating section 34, so the diaphragm 36 is moved downward by the spring 39 and returns to the state shown in the figure.

Then, the signal change detection circuit 23, which receives the flow rate pulse signal from the pulse transmitter 9 of the flowmeter 5 through line _L7 , detects a decrease in the number of pulses due to the decrease in flow rate, and sends a valve close signal to line _L4 . send. This valve closing signal is sent to the valve control circuit 21 to close the main valve 6, and is also sent to the timer 24.

The timer 24 issues a valve opening signal to the line _L5 after a predetermined period of time, for example, two seconds required for the bubbles and droplets to disappear. This valve opening signal is the valve control circuit 2
1 and is also transmitted to the counting circuit 25.
Then, the main valve 6 opens and hydraulic pressure is applied to the passage 31.
The hydraulic pressure opens the hydraulic valve V as described above. When this operation is repeated an appropriate number of times, for example, three times, the counting circuit 25
A signal is sent to the timer 24 via line _L8 to prevent the valve opening signal from being issued, and the main valve 6 remains closed and the refueling operation is stopped.

Then, the lever 16 is removed from the hook piece 61, the hydraulic valve V is closed, and the refueling nozzle 8 is hooked to the nozzle hook to complete refueling.

When carrying out the present invention and refueling a motorbike by holding the refueling nozzle in the hand, the sub lever 65 is pulled and the small valve 55 is closed. After closing the small valve 55 in this way, lever 1
If you subtract 6 and refuel, the air suction port 3 will be damaged due to bubbles, etc.
Even if 3 is blocked, the hydraulic valve V will not close.

In the above embodiment, the main valve 6 is opened and closed, but instead of opening and closing the main valve 6, the pump 3 may be stopped. Further, the signal change detection circuit 23 may be configured to install a pressure gauge on the discharge side of the main valve 6 to detect a change in the hydraulic pressure when the hydraulic pressure valve V is closed, instead of the number of pulses.

FIG. 5 shows another embodiment of a refueling nozzle 8 embodying the invention, in which reference numerals corresponding to those in FIG. 3 indicate the same components.

In the embodiment shown in FIG. 5, the auxiliary lever 65 and the small valve 5
This embodiment differs from the embodiment shown in FIG. 3 in that the hydraulic valve V is not provided with a rod 42 and that the rod 42 of the hydraulic valve V faces in the axial direction of the main body portion 30. However, the configurations of other parts are substantially the same. Since the effects are also substantially the same, the explanation will be omitted.

[Effects of the Invention] As described above, according to the present invention, since a member for opening and closing the second inlet port is provided using a diaphragm that operates under negative pressure, the air intake port is prevented from being blocked by bubbles or droplets during refueling. After the hydraulic valve closes and refueling stops, once the bubbles and droplets have disappeared, refueling can be resumed without operating the nozzle lever, and refueling can be stopped when the tank is "full". . At this time, the hydraulic valve opens and closes using hydraulic pressure, so it does not require a special power source, such as a power source, and is safe and energy-saving. In other words, according to the present invention, when the liquid level is detected, the main valve automatically closes to stop oil supply, and when the diaphragm returns and the oil is supplied again, the main valve automatically opens, so that it can be restarted after automatic operation. When refueling, there is no need to return the lever and squeeze it again like with conventional auto nozzles. Then, the pressure inside the pipe is used to restore the clutch,
The valve can also be opened at the same time. Therefore, the efficiency of refueling work is improved.

[Brief explanation of drawings]

Fig. 1 is a front view showing a refueling device embodying the present invention, Fig. 2 is an explanatory diagram showing a place where a refueling nozzle is inserted into the refueling port of a tank, and Fig. 3 is an illustration of a refueling nozzle embodying the present invention. 4 is a block diagram showing an example of a control circuit implemented in the present invention, and FIG. 5 is a 3rd sectional view showing another embodiment of the refueling nozzle.
It is a sectional view similar to the figure. DESCRIPTION OF SYMBOLS 1... Oil supply device, 3... Pump, 4... Motor, 5... Flow meter, 8... Oil supply nozzle, 9... Pulse transmitter, 10... Control circuit, V... Hydraulic pressure valve,
16...Lever, CV...Check valve, 32...
Vacuum pipe, 33... Air suction port, 36... Diaphragm, 40... Stem (member that opens and closes the second inlet), 42... Rod, 43... Valve body, 44
...first inlet, 48...outlet, 56...hydraulic pressure chamber, 59...second inlet.

Claims (1)

[Claims] 1 In the nozzle of a refueling device that has a refueling stop means built into the refueling machine body, a hydraulic valve is provided that opens and closes the refueling passage by operating a nozzle lever, and the hydraulic chamber of the hydraulic valve has one outlet and a first flow. An inlet and a second inlet are provided, and a rod is provided that slides on a nozzle lever to open and close the outlet and the first inlet, and when the nozzle lever is squeezed, the outlet opens and the first inlet is opened and closed. A negative pressure generating means is connected to the nozzle flow path, the inlet of which is closed, and one end of which communicates with the air suction port at the tip of the nozzle and the other end of which communicates with a diaphragm chamber having a diaphragm operated by negative pressure. A nozzle for a refueling device, characterized in that a member is provided in the middle of the diaphragm and opens and closes a second inlet port, and the second inlet port opens when the diaphragm is actuated and closes when the diaphragm returns.