JPH0780518B2 - Negative pressure type automatic filling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a negative pressure type automatic filling device which is constructed so that a negative pressure is generated by a flow of oil, an increase in the negative pressure is detected, and the refueling is stopped in a filled state. Regarding

[0002]

2. Description of the Related Art A typical prior art has been proposed by the applicant of the present invention, for example, JP-A-62-287898.
And Japanese Patent Laid-Open No. 1-308797. In these prior arts, a negative pressure is generated by the Venturi effect when the oil flows through the compressed portion provided in the oil supply nozzle, and this negative pressure is guided to the opening formed near the tip of the discharge pipe. The pressure is compensated by sucking air or vaporized gas of fuel oil from the opening, and the negative pressure that increases when the opening is blocked by oil or bubbles is detected by a capacitance type sensor, etc. It is configured to stop the refueling when the filling level is reached based on the output of.

[0003]

In such a prior art, in order to detect bubbles and oil level rise in a small flow where it is difficult to generate a negative pressure, a sensor can be used to judge a slight increase in negative pressure. The negative pressure detection sensitivity of is set to high. On the other hand, when the pressure chamber provided with a sensor for detecting the negative pressure and the length of the air passage connecting the opening are long, when the concentration of vaporized gas of the oil sucked through the opening is high. Causes a large pressure loss in the air passage, and a negative pressure increases due to a small amount of oil droplets adhering to the opening or the air passage, and the highly sensitive sensor causes oil or bubbles to rise to the opening. The problem arises that it operates in the same way as it does.

Therefore, an object of the present invention is to prevent erroneous detection such as detection as an increase in oil or bubbles even when the concentration of gas vaporized by oil is high. An object is to provide an automatic filling refueling device.

[0005]

DISCLOSURE OF THE INVENTION The present invention provides an oil-sending pump, a squeezing section in which oil pumped by the pump is pumped, and a negative pressure is generated by the oil flowing, and a squeezing section. An opening extending from the main body in which a pressure chamber communicating with the main body is formed and communicating with the pressure chamber via a ventilation path, and a diluting air ejection hole provided in the vicinity of the opening are formed near the tip end portion. A refueling nozzle having a discharge pipe, negative pressure detection means for detecting an increase in negative pressure in the pressure chamber,
An oil detection circuit that outputs an oil detection signal in response to the output of the negative pressure detection means, a means that limits the oil feeding speed by the generation of the oil detection signal, an air pressure source, and the air pressure source and the ejection of the discharge pipe. A negative pressure type automatic filling oil supply device, characterized in that it includes a pipe line connecting the hole and a means for permitting the supply of air from an air pressure source to the ejection hole under the condition that oil is being supplied.

[0006]

According to the present invention, the main body of the oil supply nozzle is provided with the compression portion and the pressure chamber communicating with the compression portion, and the pressure chamber is provided with the ventilation passage at the opening formed at the tip of the discharge pipe. To communicate via. When refueling is started, the air from the air pressure source
For example, the means for allowing the supply of air, which is realized by a solenoid valve or the like, is in an allowance state and is ejected from the ejection hole. The vaporized gas of the fuel oil in the oil supply pipe extending from the fuel tank of the automobile into which the discharge pipe is inserted is diluted by the air ejected from the ejection hole, and the diluted gas is sucked through the opening. The pressure chamber is supplemented with pressure. At this time, the pressure loss of the gas passing through the air passage connecting the opening and the pressure chamber is small, and there is no possibility that the negative pressure in the pressure chamber will increase due to the adhesion of a slight oil droplet to the opening or the air passage. . When the filling state is approached, the opening is closed by the oil or its bubbles rising in the oil supply pipe. When the pressure in the pressure chamber decreases due to the blockage of the opening, the negative pressure detecting means detects that and the oil detecting circuit outputs an oil detecting signal in response to the output of the negative pressure detecting means. Upon receiving the oil detection signal, the oil feeding speed limiting means switches the pump from full speed operation to low speed operation to limit or stop the oil sending speed. Thus, even when the concentration of the vaporized gas of the fuel oil is high, that is, even when the viscosity is high, the gas is mixed with the dilution air to be diluted, and the fuel oil is diluted as in the prior art. There is no possibility that the negative pressure will increase due to the adhesion of a slight amount of droplets, and erroneous detection during refueling can be prevented.

[0007]

1 is a sectional view showing an oil supply nozzle 1 according to an embodiment of the present invention. The oil supply nozzle 1 provided in the negative pressure type automatic filling device has a main body 3 and a discharge pipe 4 extending from the main body 3. The main body 3 is formed with an oil passage 5 through which fuel oil such as gasoline or light oil that has been sent under pressure passes, and the oil passage 5 is opened and closed by a main valve 6 and a sub valve 7. The sub-valve 7 is fixed to the tip of the valve rod 8, is displaced to the right in FIG. 1 by pulling the operating lever 9 in the direction of arrow A, and is opened with respect to the main valve 6. Further, when the operating lever 9 is pulled in the direction of arrow A, the main valve 6 is pushed rightward in FIG. 1 by the valve rod 8 and separated from the valve seat 10 together with the sub valve 7 to be opened, and only the sub valve 7 is opened. Fuel oil can be passed through at a larger flow rate than when it is opened.

The valve rod 8 also has a main valve 6 and an auxiliary valve 7.
The auxiliary valve 11 is provided on the downstream side of the flow direction B of the fuel oil with respect to the valve rod 8
It is mounted so that it can be displaced in the axial direction. This auxiliary valve 11
Is a frustoconical inner peripheral surface 14 due to the compression coil spring 13.
Is resiliently spring-biased toward the valve seat 15. When the main valve 6 and / or the auxiliary valve 7 are opened, the auxiliary valve 11 is opened against the spring force of the compression coil spring 13 by the pressure of the fuel oil that has been pumped, and the cone of the auxiliary valve 11 is opened. The trapezoidal outer peripheral surface 16 and the valve seat 15
When the fuel oil flows through the compressed portion 17 formed by the inner peripheral surface 14 of the negative pressure, a negative pressure is generated by the Venturi effect.

This negative pressure is introduced into the pressure chamber 20 through the communication holes 18 and 19 which are open so as to face the pinching portion 17. The pressure chamber 20 is airtightly partitioned from an atmospheric pressure chamber 23 communicating with the atmosphere by a diaphragm 21, and a photo interrupter 26 including a light emitting element 24 and a light receiving element 25 is provided in the atmospheric pressure chamber 23. To be The diaphragm 21 is provided with a light-shielding piece 27 which can be freely inserted and removed between the light emitting element 24 and the light receiving element 25, and when the negative pressure of the pressure chamber 20 becomes large, the pressure chamber 2 of the diaphragm 21 is removed.
Due to the displacement to the 0 side, the light shielding piece 27 is separated from between the light emitting element 24 and the light receiving element 25, and the light emitted from the light emitting element 24 is received by the light receiving element 25. In this way, it is possible to detect that the pressure inside the pressure chamber 20 has dropped, in other words, that the negative pressure inside the pressure chamber 20 has increased. The photo interrupter 26 and the light blocking piece 27 constitute negative pressure detecting means. The negative pressure detection sensitivity of the negative pressure detection means is such that the pressure chamber 20 has a negative pressure of -5, for example.
At about 0 mmHg, the atmospheric pressure chamber 23 and the pressure chamber 2
It is configured to react with a slight pressure difference from zero.

As will be described later, the lid 30 surrounding the atmospheric pressure chamber 23 is provided with a display lamp 3 as a display means for illuminating at the time of filling and indicating that it is full.
1 is provided, and the refueling worker can use this display lamp 31
By confirming that is lit, it is possible to easily recognize that the filling has been reached from the outside.

The pressure chamber 20 includes a ventilation hole 33 formed in the main body 3, and a pressure-compressing conduit 3 as a ventilation passage communicating with the ventilation hole 33.
4, and an opening 35 formed near the tip of the discharge pipe 4.
Through the atmosphere. The pressure chamber 20 can be supplemented by the air sucked through the opening 35, the conduit 34, and the ventilation hole 33.

Further, the discharge pipe 4 is provided with a pipe line 37 on the side opposite to the pipe line 34 with respect to the pipe shaft 36, and the pipe line 37 is close to the opening 35 near the tip of the discharge pipe 4. It is open to the atmosphere through the ejection port 38 facing in the opposite direction. Diluting air is ejected from the ejection holes 38, and the vaporized gas of the low-concentration fuel oil diluted by the diluting air is sucked through the opening 35 for compensating pressure, so that it is diluted. It is possible to prevent the occurrence of a large pressure loss in the pipe line 34 and the air passage 33, which are relatively long as compared with the case where the gas before being sucked is sucked. As a result, even if a slight oil droplet adheres to the inside of the opening 35, the pipe 3
4 and the air holes 33 allow a low-concentration gas or air to flow in to supplement the pressure, and the diaphragm 21 is not blocked by oil or bubbles.
Is not likely to be largely displaced to the pressure chamber 20 side,
False detection during refueling can be prevented.

FIG. 2 is a block diagram showing the configuration of the entire apparatus including the oil supply nozzle 1. Fuel oil in a storage tank (not shown) buried underground in a gas station is pumped up by a pump 41.
Driven by. The fuel oil pumped up by the pump 41 is measured by the flow meter 44, and then the flexible pipe 4
It is sent to the refueling nozzle 1 under pressure via the flow path 5. The refueling nozzle 1 is detachably attached to a nozzle case 46 provided on a side wall of a main body (not shown) of the refueling device, and a nozzle detection for detecting whether or not the refueling nozzle 1 is attached to the nozzle case 46. A switch 47 is provided. The refueling device main body is also provided with a display 48 realized by, for example, a plasma display tube, and is configured to display the refueling amount refueled by the refueling nozzle 1.

The flow meter 44 includes a flow pulse generator 4
9 is provided. The flow rate pulse transmitter 49 outputs a flow rate pulse signal s1 of one pulse to the control means 50 every time the flow meter 44 measures, for example, 1/100 liter. Further, the nozzle detection switch 47 outputs to the control means 50 a nozzle detection signal s2 which is at a low level when the fuel supply nozzle 1 is hooked on the nozzle case 46 and is at a high level when it is removed.

The control means 50 basically includes an oil detection circuit 51, a determination circuit 53, a motor control circuit 54 and a valve control circuit 57.

The oil detection circuit 51 outputs an oil detection signal s4 in response to the negative pressure detection signal s3 output from the photo interrupter 26.

The judgment circuit 53 switches the nozzle detection signal s2 output from the nozzle detection switch 47 from low level to high level when refueling is started, that is, when the refueling nozzle 1 is removed from the nozzle case 46. The low speed determination signal s6 for operating the pump 41 at low speed is output to operate at low speed for a predetermined time T1, and then the full speed determination signal s5 is output to operate at full speed. When the first oil detection signal s4 is input from the oil detection circuit 51, the pump 4
1 outputs the low speed determination signal s6 for switching from full speed operation to low speed operation, operates the pump 41 at low speed for a predetermined time T2, and then outputs the full speed determination signal s5 again to operate the pump 41 at full speed. When the oil detection signal s4 is input before the elapse of the predetermined time T2, the filling determination signal s7 for stopping the pump 41 is output.

When the full speed determination signal s5 is input, the motor control circuit 54 outputs the full speed drive signal s8 to operate the pump motor 43, and therefore the pump 41 at full speed, and when the low speed determination signal s6 is input, the motor control circuit 54 operates at low speed. The drive signal s9 is output to operate the pump 41 at a low speed,
When the fill determination signal s7 is input, the stop signal s10
Is output to stop the pump 41.

The valve control circuit 57 outputs a valve opening signal s11 when the oil supply is started or the first oil detection signal s4 is input to open the electromagnetic valve 55 which is a means for permitting air supply. Then, the diluting air from the air pressure source 56 is sent to the pipe line 37 to be ejected from the ejection hole 38, and the refueling is completed, that is, the refueling nozzle 1 is connected to the nozzle case 41.
Nozzle detection signal s of the nozzle detection switch 47
By switching 2 from the high level to the low level, the valve closing signal s12 is output to close the solenoid valve 55,
The dilution air from the air pressure source 56 is shut off.

The electromagnetic valve 55 and the air pressure source 56 constitute a diluting air supply means 58.

The display lamp 31 has a determination circuit 53.
Is turned on by the fill display signal s13 that is output at the same time as the fill determination signal s7, and when the nozzle detection signal s2 of the nozzle detection switch 47 is switched from the high level to the low level, that is, the refueling nozzle 1 is in the nozzle case. Display stop signal s output when returned to 46
It is turned off by 14.

The control means 50 is realized by, for example, a microcomputer, and the pneumatic pressure source 5 is used.
6 may be realized by, for example, a compressor, or in an oil supply device having an oil type discriminating function, cleaning air used for cleaning the sensor after detecting the oil type may be used.

FIG. 3 is a timing chart for explaining the refueling operation of the embodiment shown in FIGS. 1 and 2.
FIG. 4 is a flow chart for explaining the refueling operation. First, the refueling work is started in step a1, and the refueling operator installs the refueling nozzle 1 in the nozzle case 4 in step a2.
6, the nozzle detection signal s2 of the nozzle detection switch 47 is switched from the low level to the high level, the counting circuit 59 is reset, and the display value of the display 48, which previously displayed the amount of refueling, is reset to zero. At the same time, the determination circuit 53 and the valve control circuit 57 are set. Then, in step a3, the determination circuit 53 outputs the low speed determination signal s6 to the motor control circuit 54, whereby the motor control circuit 54 outputs the low speed drive signal s9 to drive the pump motor 43 at low speed at time t1. 41 starts pumping operation at a low speed. Further, the air pressure source 56 starts the air feeding operation by switching the nozzle detection signal s2 from the low level to the high level, but keeps the electromagnetic valve 55 closed by the valve closing signal s12 from the valve control circuit 57. Be drunk

Thus, when the low speed operation of the pump 41 is started in step a3, the process proceeds to step a4, and the time T1 required to judge whether the main valve 6 and / or the sub valve 7 of the fueling nozzle 1 is open or not. During this period, low speed operation is continued. This time T1 is, for example, about 1 second.

When the time T1 elapses and the time t2 is reached in this way, the process moves to step a5, and the determination circuit 53 outputs the full speed determination signal s5, which causes the motor control circuit 54 to output the full speed drive signal to drive the pump motor 43. Drive at full speed. As a result, the pump 41 is driven at full speed.

In such a state, the process proceeds to step a6, and the operation lever 9 is operated with the discharge pipe 4 of the refueling nozzle 1 inserted in the refueling pipe 60 extending from the fuel tank of the vehicle to be refueled (see FIG. 1). When pulled in the direction of arrow A, the sub-valve 7 and the main valve 6 are opened in this order, and the fuel oil flows through the pinching portion 17 to generate a negative pressure. The suction force generated by this negative pressure is guided to the pressure chamber 20 via the communication holes 18 and 19, and the pressure in the pressure chamber 20 is reduced to a negative pressure.

When the pressure in the pressure chamber 20 becomes negative in this way, the air in the oil supply pipe 60 or the vaporized gas of the fuel oil is sucked from the opening 35 through the ventilation passage 33 and the pipe passage 34, and the pressure chamber is aforesaid. The inside of 20 is supplemented. Therefore, unless the opening 35 is blocked by the fuel oil or bubbles thereof, the pressure chamber 20 is kept in a pressure-suppressed state, so that the light emitted from the light-emitting element 24 is blocked by the light-shielding piece 27 and is blocked by the light-receiving element 25. It is not received. In such a state, the fuel oil pumped up by the pump 41 driven at full speed is supplied to the discharge pipe 4 of the refueling nozzle 1.
The fuel is continuously supplied to the inside of the fuel tank (not shown) through the oil supply pipe 60. In this way, when the fuel tank is filled with the fuel oil and the fuel oil rises in the oil supply pipe 60 and the opening 35 is closed by the liquid surface or bubbles on the liquid surface, the negative pressure in the pressure chamber 20 increases. , Diaphragm 21 is pressure chamber 20
The light shielding piece 27 is disengaged from between the light emitting element 24 and the light receiving element 25 by being displaced to the side. Then, the light emitted from the light emitting element 24 is received by the light receiving element 25, and the time t3
Then, the negative pressure detection signal s3 is output, and the process moves from step a7 to step a8.

Oil detection circuit 5 to which the negative pressure detection signal s3 is input
1 is the oil detection signal s to the determination circuit 53 and the valve control circuit 57.
4 is output. Accordingly, the determination circuit 53 outputs the low speed determination signal s6 to the motor control circuit 54, the motor control circuit 54 outputs the low speed drive signal s9 to the pump motor 43 to drive the pump motor 43 at low speed, and the pump 41 operates at low speed. The fuel oil is supplied from the oil supply nozzle 1 at a small flow rate by switching to the operation. At the same time, the valve control circuit 57 outputs the valve opening signal s11 to the solenoid valve 55 to open it, and the air from the supply means 58 passes through the pipe line 37 and the ejection hole 38 of the discharge pipe 4.
Emitted from.

In this way, a small amount of oil is supplied while the diluting air is being discharged from the ejection holes 38, and at step a9, T
It is determined whether or not the negative pressure detection signal s3 is input to the oil detection circuit 51 during the lapse of 2 seconds (about 2 seconds). If not input, the process proceeds to step a10, and the determination circuit 53 outputs the full speed determination signal s5 again at time t4, and the motor control circuit 5
4 outputs the full speed drive signal s8 to drive the pump motor 43 at full speed and the pump 41 at full speed. In this way, fuel is supplied at a large flow rate until the second negative pressure is detected at time t5.

In step a11, it is determined whether or not the negative pressure detection signal s3 is input to the negative pressure detection circuit 51 during the full speed operation. When the negative pressure detection signal s3 is input at time t5, the process proceeds to step a12. Then, the pump 41 is switched to the low speed operation again, the process returns to the step a9, and the steps from the steps a9 to a12 are performed without error detection until the oil detection signal s4 is input to the oil detection circuit 51 within the time T2 during the low speed operation. The operation is repeated. That is, when the operation diagram of the pump motor 43 shown in FIG. 3 is taken as an example, the oil supply pipe 60 is switched to the full-speed operation at the time t6.
(See FIG. 1) Due to the rise of the oil level in the oil, bubbles on the oil reach the vicinity of the tip of the discharge pipe 4 inserted in the oil supply pipe 60, and therefore, the time t7 immediately after the time t6. Then, the pump 41 is switched from full speed operation to low speed operation, and the process goes to step a9.

In step a9, when the opening 35 is closed by the rising oil or bubbles while the time T2 has elapsed, the process proceeds to step a13, where the determination circuit 53 outputs the fill determination signal s7 and the motor control circuit 54. Outputs a stop signal s10 to stop the pump motor 43, and the pumping operation of the pump 41 is stopped. Further, the judgment circuit 53 outputs the fill display signal s13, and step a1
In step 4, the display lamp 31 is turned on to display that it is full. The refueling operator who visually recognizes that the display lamp 31 is lit recognizes that the fuel tank 1 has reached the fullness, and then the refueling nozzle 1
Of the discharge pipe 4 of the nozzle case 46 from the oil supply pipe 60.
Return to. Then, in step a16, the nozzle detection signal s2 which has been at the high level until now is switched to the low level, and the determination circuit 53 outputs the display stop signal s14 by this change and turns off the display lamp 31 at time t9. At the same time, the valve control circuit 57 causes the valve closing signal s12
Is output to close the on-off valve 55 and stop the air supply operation. At this time, in the oil supply device having the oil type determination function, when the air pressure source for cleaning is used, the air supply may be continued, or the air supply may be performed when the solenoid valve 55 is closed. You may make it stop. In this way, the display lamp 31 is turned off, the air supply operation is stopped, and the refueling operation is completed in step a16.

In the above-described embodiment, when the first negative pressure detection signal s3 is input to the negative pressure detection circuit 51, the dilution air is ejected from the ejection hole 38 of the refueling nozzle 1. As another embodiment of the invention, a refueling nozzle 1
The air supply operation may be started at the same time when the nozzle is removed from the nozzle case 46 (that is, time t1 in FIG. 3), and the stop of the air supply operation is performed by the display lamp 31 at the time of filling detection at the time t8. It may be performed at the same time as the lighting operation.

Further, in the above-mentioned embodiment, the pump motor 43 is controlled in order to switch the oil supply amount to a small flow rate, but as another embodiment of the present invention, an electromagnetic valve for opening and closing the oil feed passage is provided. It is also possible to form a bypass flow path other than the flow path opened and closed by this electromagnetic valve to supply oil at a large flow rate, a small flow rate and a minute flow rate. That is, when refueling at a large flow rate, the pump motor is driven at full speed, the solenoid valve is opened, and the flow passage opened by the solenoid valve and the bypass flow passage are used for refueling. The solenoid valve is closed while the pump motor is driven at full speed, and oil is supplied only by using the bypass flow passage.When oil is supplied at a small flow rate, the pump motor is operated at low speed with the electromagnetic valve closed. Alternatively, the flow rate flowing from the bypass flow path may be reduced. In this case, at time t3 in FIG. 3, refueling is performed at a large flow rate until a negative pressure is detected, and after detection, the large flow rate is changed to a fine flow rate. For example, at time t10 between times t3 and t4, the fine flow rate is changed to a small flow rate. Switching, and time t after the time T2 has elapsed
By switching from a small flow rate to a large flow rate in 4 and controlling in multiple stages, by utilizing this minute flow rate even at the end of refueling,
The pump may be stopped so that the amount of refueling displayed by the display device is a value that does not produce a fraction.

[0034]

According to the present invention, air can be jetted from the vicinity of the tip of the discharge pipe of the oil supply nozzle by the generation of the oil detection signal, and the vaporized gas of the fuel oil sucked from the opening can be diluted. There is no risk of a large pressure loss in the ventilation path from the opening to the pressure chamber, and even if a small amount of fuel oil droplets adheres to the opening, the negative pressure in the pressure chamber will increase unnecessarily and the negative pressure detection means Can be prevented from being erroneously detected, and even if bubbles or liquid of fuel oil are not rising, the detection operation is repeated many times and it takes a long time to refuel. It is possible to prevent such inconvenience.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an oil supply nozzle 1 according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an entire apparatus including a fueling nozzle 1.

FIG. 3 is a timing chart for explaining a refueling operation of the embodiment shown in FIGS. 1 and 2.

FIG. 4 is a flow chart for explaining a refueling operation of the embodiment.

[Explanation of symbols]

 1 Oil Supply Nozzle 3 Body 4 Discharge Pipe 5 Oil Path 17 Clamping Section 20 Pressure Chamber 26 Photointerrupter 27 Light-Shielding Piece 35 Opening 37 Pipeline 38 Spouting Hole 41 Pump 43 Pump Motor 44 Flowmeter 47 Nozzle Detection Switch 48 Indicator 60 Oil Supply Pipe s1 Flow rate pulse signal s2 Nozzle detection signal s3 Negative pressure detection signal s4 Oil detection signal s5 Full speed determination signal s6 Low speed determination signal s7 Satisfaction determination signal s8 Full speed drive signal s9 Low speed drive signal s10 Stop signal s11 Valve open signal s12 Valve close signal s13 Fill display signal s14 Display stop signal

Claims (1)

[Claims] 1. An oil-sending pump, a squeezing unit that pumps the oil pumped by the pump, and a negative pressure is generated when the oil flows, and a pressure chamber that communicates with the squeezing unit. Body and extending from the body,
An opening that communicates with the pressure chamber via a ventilation path, and a diluting air ejection hole provided in the vicinity of the opening and having a discharge pipe formed in the vicinity of the tip end, and a negative pressure in the pressure chamber Negative pressure detection means for detecting an increase, an oil detection circuit for outputting an oil detection signal in response to the output of the negative pressure detection means, means for limiting the oil transfer speed by the generation of the oil detection signal, An air pressure source, a conduit connecting the air pressure source of the discharge pipe and the ejection hole, and means for permitting the supply of air from the air pressure source to the ejection hole on condition that refueling is being performed. Negative pressure type automatic refueling device.