JPH04216000A - Oil feeding device - Google Patents

Abstract

PURPOSE:To automatically examine whether or not an oil feeding nozzle is opened after completion of a preset oil feeding and, when the oil feeding nozzle is opened, stop the next oil feeding. CONSTITUTION:To effect a preset oil feeding, the intended oil feed amount is preset by a preset device 17, an oil feeding nozzle 10 is opened to start the oil feeding and, when the preset oil feed amount is reached, the operation of a motor 5 is stopped. A control circuit 20, upon judging that the current oil feeding is the preset feeding and the the oil feeding nozzle 10 has been put back in a nozzle receiving part 11, keeps a motor 5 rotating for a predetermined time and, upon judging that the oil feeding nozzle is opened from the oil amount measured by a flow meter 7, stops the energizing of the motor 5.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention prevents an accident in which the refueling nozzle is stored in the nozzle storage part without realizing that the valve is left open and the next refueling is performed. This invention relates to a refueling device that can reliably prevent this.

0002

2. Description of the Related Art Conventionally, a preset-type oil supply device is known which is capable of supplying a fixed amount of oil corresponding to a desired amount of oil or amount of money by presetting the desired amount of oil or amount of money.

When this type of refueling device is used in a fixed refueling machine, it generally includes a pump and a flow meter provided in a housing, one end of which is connected to the pump and flow meter, and the other end connected to a refueling hose. a refueling nozzle provided at the tip of the hose; a nozzle storage section provided in the housing for accommodating the refueling nozzle; It is comprised of a switch mechanism to be driven, and a preset mechanism that performs preset refueling by presetting a desired amount or amount of refueling at the time of refueling. Then, the preset refueling mechanism presets the refueling amount or amount, removes the refueling nozzle from the nozzle housing, refuels the vehicle's fuel tank, etc., and when the preset amount is reached, the pump stops driving and ends the fixed amount refueling. Thereafter, the refueling nozzle is stored in the nozzle storage part in preparation for the next refueling.

0004

[Problems to be Solved by the Invention] However, the preset type refueling device described above differs from normal refueling work in which a refueling station worker manually opens and closes the refueling nozzle.
When the preset amount is reached, the pump automatically stops driving and performs a fixed amount of lubrication, so it is easy to turn off the lubrication nozzle without noticing that it is still open. Sometimes it gets hung up in the nozzle storage area. As a result, when the refueling nozzle is removed from the nozzle accommodating portion during the next refueling operation, there is a risk that the switch mechanism will be activated immediately, the pump will be driven, and the oil will be instantaneously discharged.

The purpose of the present invention is to improve the drawbacks of the prior art described above, and it automatically checks whether or not the refueling nozzle is open after the end of preset refueling, and determines whether the refueling nozzle is open or not. To provide a refueling device that prohibits the next refueling operation only if

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a pump driven by a motor, a flow meter, etc., which supplies fuel corresponding to a desired amount or amount of fuel that is preset as a preset value when refueling. In a refueling device equipped with a preset refueling function, the motor is automatically stopped at a fixed amount when the refueling amount reaches the preset value by stopping the motor regardless of the valve opening state of the refueling nozzle. , a preset lubrication determination means for determining that the current lubrication is a preset lubrication when the amount of lubrication reaches a preset value and the motor stops at a fixed amount, and the lubrication nozzle is returned to or removed from a predetermined housing part. When the current refueling is determined to be preset refueling by the nozzle detecting means for detecting the preset refueling and the preset refueling determining means and a detection signal is output from the nozzle detecting means, the motor is energized for a predetermined period of time to drive the pump. a pump driving means for driving the pump, and comparing the total measured flow rate measured by the flow meter by the pump driving means with a predetermined flow rate set in advance, so that the total measured flow rate reaches the predetermined flow rate. a nozzle valve opening detection means that outputs a signal when the detection means outputs a drive stop signal to the pump drive means when the signal from the detection means is input;
and pump drive prohibition means for prohibiting energization of the motor.

[0007]

[Operation] With the above structure, when the current refueling is preset refueling, the preset refueling determining means determines that it is preset refueling by stopping the motor at a fixed amount.

On the other hand, after the preset refueling is completed, the refueling nozzle is returned to the nozzle housing, or the refueling nozzle is removed from the nozzle housing when starting the next refueling operation, and the nozzle detection means detects the state of the refueling nozzle. Detect.

[0009] Therefore, the pump driving means determines that the current refueling is preset refueling by the preset refueling determining means, and
When a detection signal such as a nozzle return signal or a nozzle removal signal is output from the nozzle detection means, the motor is energized for a predetermined period of time to drive the pump.

[0010] If the oil supply nozzle is open while the pump is being driven in this manner, the oil will be discharged from the oil supply nozzle, so the nozzle open valve detection means will detect the total amount measured by the flowmeter. The measured flow rate is compared with a predetermined flow rate set in advance, and a signal is output when the total measured flow rate reaches the predetermined flow rate, and the pump drive prohibition means receives the valve open detection signal from the nozzle open valve detection means. As a result, a drive stop signal is output to the pump drive means, and energization of the motor is prohibited.

[0011]

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3, taking as an example a case in which a safety check is performed to determine whether or not the refueling nozzle is open after the end of preset refueling.

In FIG. 1, reference numeral 1 denotes a housing constituting a fixed oil supply device, and the housing 1 is connected to a lower housing 2.
and an upper housing 3. Inside the lower housing 2, a pipe 4 whose one end is to be connected to a tank (not shown) is provided. A pump 6 and a flowmeter 7 for measuring the amount of oil supplied are provided, and the flowmeter 7 is provided with a flow rate transmitter 8 for transmitting a flow rate signal proportional to the measured flow rate. Further, a refueling hose 9 is connected to the other end of the piping 4, and a refueling nozzle 10 is attached to the tip of the refueling hose 9. Reference numeral 11 denotes a nozzle storage part provided in the lower housing 2 to store the refueling nozzle 10 except during refueling work. A switch 12 is provided which is opened by applying it to the storage portion 11, and as will be described later, the motor 5 is driven when the switch 12 is closed, and the motor 5 is stopped when the switch 12 is opened. On the other hand, an oil recovery device 11A into which the tip of the oil supply nozzle 10 is inserted is attached to the nozzle storage portion 11, and the oil recovery device 11A collects oil leaked from the oil supply nozzle 10 into, for example, an air separator (not shown). It is supposed to be returned.

On the other hand, a display 13 is provided on the front of the upper housing 3, and the display 13 is provided with a price display 14, a fuel supply amount display 15, and a unit price display 16. Further, a preset device 17 is provided on the side surface of the upper housing 3, and the preset device 17 includes a preset button 18A for presetting the amount of oil to be supplied, for example, 10 liters, 15 liters, 20 liters, 30 liters, and 40 liters.
18B, 18C, 18D, and 18E are provided, and a desired preset amount can be set by pressing any of these preset buttons 18A to 18E. Note that the preset buttons 18A to 18E are not limited to presetting the amount of oil to be supplied; for example, 1,000
yen, 1,500 yen, 2,000 yen, 3,000 yen, 4,
It may be a fixed amount preset button that presets 000 yen, or it may be configured to have both preset buttons at the same time.On the other hand, the preset buttons 18A to 18E may be replaced with a dial type setting device that allows stepless setting. Furthermore, a unit price setting device 19 for setting the amount per unit flow rate, that is, a unit price, and a control circuit 20 detailed in FIG. is displayed on the unit price display 16. In addition,
The unit price setting device 19 is operated only when there is a change in the unit price, and is normally closed by the upper housing 3.

Next, FIG. 2 shows a specific configuration of the control circuit 20 described above, and the input side of the control circuit 20 is connected to a flow rate transmitter 8.
, a switch 12, and a preset device 17, and its output side is connected to an alarm 21 such as a buzzer or lamp, a motor drive circuit 22, and a display drive circuit 23, respectively. Here, the motor drive circuit 22 connects the AC power source E and the motor 5.
It is inserted between the motor 5 and controls starting and stopping of the motor 5. Further, the display drive circuit 23 is connected to the display 13 and converts a signal from a counting circuit, which will be described later, into a display drive signal for each digit to cause the display 13 to perform a display operation.

On the other hand, the control circuit 20 includes AND circuits 24, 2
5, 26, 27, 28, 29, 30, 31, knot circuits 32, 33, 34, 35, and monostable multivibrators 36, 37, 38 used as trigger circuits (hereinafter referred to as trigger MM circuits). , OR circuits 39 and 40, and a counting circuit 41 that counts the flow rate signal from the flow rate transmitter 8.
, 42, a memory circuit 43 that stores a predetermined flow rate (for example, 0.05 liters) that can be absorbed by the expansion of the refueling hose 9 during the safety check described above, and a preset amount from the preset device 17. a comparator circuit 45 that compares the amount of refueling counted by the counting circuit 41 with a predetermined flow rate stored in the memory circuit 43 and outputs a matching signal when the two match; a comparison circuit 46 that compares the amount of refueling counted by the refueling amount with a preset amount stored in the storage circuit 44 and outputs a predetermined amount signal when the two match; and a flip-flop circuit 47 (hereinafter referred to as FF circuit 47). , a transmitting circuit 48 that repeatedly emits pulses at predetermined intervals t1 for a predetermined short time t0 as described later, a counting circuit 49 that receives and counts pulses from the transmitting circuit 48, and repeatedly energizes the motor 5. It is composed of a memory circuit 50 that stores the number of times of energization (for example, 5 times), and a comparison circuit 51 that compares the values of the counting circuit 49 and the memory circuit 50 and outputs a signal when the two match. .

The flow rate transmitter 8 includes an AND circuit 24,
26, and the AND circuit 24 is connected to the input side of the counting circuit 4.
1, and the AND circuit 26 is connected to the counting circuit 42.

The switch 12 connects the reset terminals 41R and 49R of the counting circuits 41 and 49 via the trigger MM circuit 36.
are connected to the input sides of the AND circuits 26 and 29, and connected to the input sides of the AND circuits 24 and 25 via the NOT circuit 32.
It is connected to the input side of the AND circuit 27 via the M circuit 37. Preset device 17 is connected to storage circuit 44 .

The comparator circuit 46 has an input side connected to the counting circuit 42.
, and a storage circuit 44, and an output terminal 46A for outputting a quantitative signal is connected to the input sides of AND circuits 24 and 25, as well as to the input side of AND circuit 30 via a NOT circuit 34. Further, the counting circuit 42 is connected to the display 13 via a display drive circuit 23.

The output side of the AND circuit 25 is connected to the oscillation circuit 4.
The output side of the transmitting circuit 48 is connected to a counting circuit 49 and also to the motor drive circuit 22 via an AND circuit 31 and an OR circuit 40. On the other hand, the output side of the AND circuit 27 is connected to the reset terminal 42R of the counting circuit 42 via the OR circuit 39, and
It is connected to the display drive circuit 23.

The input side of the comparator circuit 45 is connected to the counting circuit 41 and the memory circuit 43, and the output terminal 45A for outputting a coincidence signal is connected to the AND circuit 28 via the NOT circuit 33.
It is also connected to the input side of the AND circuit 31 via the NOT circuit 35, and also connected to the set terminal 47S of the FF circuit 47. The output side of the AND circuit 28 is connected to the reset terminal 4 of the FF circuit 47.
7R and the input side of the OR circuit 39. Moreover, the set output circuit 27 of the FF circuit 47
, 29, the output side of the AND circuit 29 is connected to the input side of an AND circuit 30, and the output side thereof is connected to an OR circuit 40.

Furthermore, the input side of the comparator circuit 51 is connected to a counting circuit 49 and a memory circuit 50, respectively, and its signal output terminal 51A is connected to a reset terminal 48R of the oscillation circuit 48, and is also connected to a trigger MM circuit 38. It is connected to the input side of the AND circuit 28.

The oil supply system of this embodiment is constructed as described above, and its operation will now be explained based on the operational diagram shown in FIG.

Before operation, the refueling nozzle 10 is housed in the nozzle housing 11, and the switch 12 is open. Further, the control circuit 20 is in a normal state and the FF circuit 47
The reset output terminal 47Q of is in a set state. Furthermore, during the previous refueling, the valve closing of the refueling nozzle 10 is confirmed, the counting circuits 41 and 42 are reset to the previous refueling amount, and only the output sides of the knot circuits 32, 33, 34, and 35 are in the output state (hereinafter referred to as The other terminals, except for the output terminal 51A of the comparison circuit 51, are in an output stopped state (hereinafter referred to as "L").

[0024] First, a normal refueling operation that does not use a preset device will be described.

First, the refueling nozzle 10 is inserted into the nozzle storage section 11.
When the switch 12 is removed, the switch 12 is closed, and the MM circuit 36 becomes "H" state for a moment and outputs to the reset terminals 41R and 49R of the counting circuits 41 and 49.
At the same time, the previous count values of 1 and 49 are reset, and the MM circuit 37 is momentarily in the "H" state, the output side of the AND circuit 27 is momentarily in the "H" state, and the reset terminal of the counting circuit 42 is reset via the OR circuit 39. 42R to reset the counting circuit 42. On the other hand, the output side of the AND circuit 27 is "H"
When the state is reached, the signal is output to the display drive circuit 23, and the display drive circuit 23 is placed in an operable state (the display devices 14 and 15 are reset to zero). Furthermore, when the switch 12 is closed, the output side of the AND circuit 29 goes into the "H" state, and outputs the AND circuit 30 to the "H" state via the OR circuit 40 to the motor drive circuit 22. As a result, the motor 5
AC power E is supplied to energize the motor 5 and drive the pump 6. As a result of the above, the state becomes ready for refueling.

When the refueling nozzle 10 is inserted into the fuel tank of the vehicle and the valve is opened in the above state, the oil liquid from the tank flows into the pipe 4.
, pump 6, flow meter 7, and oil supply hose 9, and the flow rate at this time is measured by the flow meter 7, and the flow rate signal from the flow rate transmitter 8 provided in the flow meter 7 is as follows. It is output to AND circuits 24 and 26. However, although the gate of the AND circuit 24 is closed by the NOT circuit 32, the gate of the AND circuit 26 is opened by the switch 12.
is input to the counting circuit 42 via the
It is counted in 0-base and further integrated and displayed on the display 13 via the display drive circuit 23 every moment.

When the desired amount of oil is reached, the oil supply nozzle 10 is closed, and the oil supply nozzle 10 is inserted into the nozzle housing 1.
Store it in 1. As a result, the switch 12 is opened, the AND circuit 29 goes into the "L" state, the motor 5 is stopped via the OR circuit 40 and the motor drive circuit 22, and the drive of the pump 6 is stopped. With the above steps, normal refueling work is completed.

Next, a preset oil supply operation using the preset device 17 will be described.

First, prior to refueling work, the preset buttons 18A to 18E of the preset device 17 are operated to preset a desired amount of refueling. Thereby, the oil supply amount is stored in the storage circuit 44 as a preset amount. next,
When the refueling nozzle 10 is removed from the nozzle accommodating portion 11, the switch 12 is closed, and the motor 5 is activated in the same way as in the normal refueling operation described above, and becomes ready for refueling. In this state, when the refueling nozzle 10 is inserted into the fuel tank of the vehicle and the valve is opened, refueling is performed, and the flow rate signal from the flow rate transmitter 8 is inputted to the counting circuit 42 via the AND circuit 26 and counted.

On the other hand, the comparator circuit 46 compares the preset amount in the memory circuit 44 and the amount of oil supplied which is counted every moment by the counting circuit 42, and when the two match, outputs a quantitative signal from the output terminal 46A. As a result, the quantitative signal is input to the NOT circuit 34, the output from the NOT circuit 34 becomes "L" state, and the input side of the AND circuit 29 is reset to the FF circuit 47. Since there is no input from the NOT circuit 34 to the AND circuit 30, , the AND circuit 30 becomes "L" state. For this reason,
The rotation of the motor 5 is stopped via the OR circuit 40 and the motor drive circuit 22, and the drive of the pump 6 is stopped, thereby completing the preset oil supply.

When the preset lubrication is completed in this way, the operator returns the lubrication nozzle 10 to the nozzle housing 11, which opens the switch 12 and closes the gates of the AND circuits 26 and 29 to prepare for the next lubrication. .

However, at the time of preset oil supply, since the rotation of the motor 5 is stopped by the quantitative signal from the comparator circuit 46, the oil supply nozzle 10 is inserted into the nozzle housing 11.
When returning the oil supply nozzle 10 to the original position, the oil supply nozzle 10 may be returned with the valve still open.

Therefore, in the present embodiment, when the refueling nozzle 10 is stored in the nozzle storage section 11, it is determined whether or not the refueling nozzle 10 remains open, and the valve remains open. If so, the system is configured to perform a safety check that prohibits the next refueling operation.

The safety confirmation operation will be described below.

As described above, when the refueling nozzle 10 is retracted and the switch 12 is opened, the output side of the knot circuit 32 becomes "H" state, and the input side of the AND circuit 25 is connected to the output terminal of the knot circuit 32 and the comparison circuit 46. 46A is input, and the AND circuit 25 goes into the "H" state. As a result, the oscillation circuit 48 is brought into operation for a predetermined short time t0.
is in the “H” state, and is in the “L” state only for a predetermined short time t1.
'' state is repeatedly output. This repetitive pulse repeatedly energizes the motor 5 for the predetermined short time t0 via the AND circuit 31, the OR circuit 40, and the motor drive circuit 22, and repeatedly drives the pump 6. As a result, the liquid is sent to the refueling nozzle 10 via the piping 4, pump 6, flow meter 7, and refueling hose 9. In this case, even if oil leaks from the oil supply nozzle 10, it will be collected by the oil recovery device 11A and will not leak outside.

On the other hand, since the NOT circuit 32 is in the "H" state, the output from the NOT circuit 32 is input to the AND circuit 24. The AND circuit 24 has a comparison circuit 46
Since the quantitative signal from the output terminal 46A of the AND circuit 24 is inputted, the gate of the AND circuit 24 is opened. As a result, by repeatedly driving the pump 6 for a predetermined short time t0 as described above, the flow rate measured by the flowmeter 7 is outputted as a flow rate signal from the flow rate transmitter 8 each time, and this flow rate signal is sent to the AND circuit 24. The total oil supply amount is counted in binary coded decimal notation by the counting circuit 41 via .

However, since the predetermined flow rate is stored in the memory circuit 43, the comparator circuit 45 compares the predetermined flow rate with the total oil supply amount counted by the counting circuit 41. Now, if the refueling nozzle 10 remains open, a flow rate greater than a predetermined flow rate will flow from the refueling nozzle 10 due to the repeated driving of the pump 6, so that, for example, a second repeated pulse will be output from the transmitting circuit 48, and the motor 5 will be It is assumed that a coincidence signal is output from the output terminal 45A of the comparator circuit 45 at the point in time when the fuel supply nozzle 10 has rotated twice, and the opening of the fuel nozzle 10 is detected.

As a result, the match signal from the comparator circuit 45 is input to the NOT circuit 35, and the NOT circuit 35 is set to "H".
The state is changed to the "L" state, and the gate of the AND circuit 31 is closed. As a result, although pulses are continuously output from the transmitting circuit 48, the output from the AND circuit 31 is stopped, the motor 5 is deenergized via the OR circuit 40 and the motor drive circuit 22, and the pump 6 stop. Therefore, even if the oil supply nozzle 10 remains open, no more oil will flow out. On the other hand, the match signal from the comparison circuit 45 is input to the set terminal 47S of the FF circuit 47, and the
The F circuit 47 is set to a set state, and a set signal is output from the set output terminal 47Q, thereby activating the alarm 21. This allows the operator at the gas station to know that the fuel nozzle 10 remains open.

Note that even if the alarm 21 does not operate or does not exist in this state, the reset output terminal 47Q of the FF circuit 47 remains in the "L" state. During the next refueling operation, even if the refueling nozzle 10 is removed and the switch 12 is closed, the AND circuit 29
Since its output side remains in the "L" state, the motor 5 is in the "L" state, so the counting circuit 42 is not reset.

On the other hand, the memory circuit 50 stores the numerical value "5", that is, 5 times as the number of times the motor 5 is repeatedly energized, and pulses are sequentially input from the transmitting circuit 48 to the counting circuit 49. Then, the comparison circuit 51 compares the count value of the counting circuit 49 with the number of repeated energizations stored in the storage circuit 50, and outputs a coincidence signal whose count value is "5" from its output terminal 51A. This coincidence signal is input to the reset terminal 48R of the oscillation circuit 48, and the oscillation circuit 48 enters the oscillation stop state regardless of the output state of the AND circuit 25. Further, the coincidence signal is input to the MM circuit 38, and the MM circuit 38
becomes "H" state momentarily, and the trigger pulse is sent to AND circuit 2.
However, since the gate of the AND circuit 28 is closed by the match signal from the comparison circuit 45 inputted via the NOT circuit 33, the FF circuit 47 is not reset.

Next, as described above, the user notices that the fuel nozzle 12 remains open due to the activation of the alarm 21, and removes the fuel nozzle 10 from the nozzle housing 11 again. As a result, the switch 12 is closed, and the MM circuit 36 is momentarily put into the "H" state, which is input to the reset terminals 41R and 49R of the counting circuits 41 and 49, thereby resetting each of the counting circuits 41 and 49. On the other hand, since the MM circuit 37 is also momentarily in the "H" state and the AND circuit 27 is in the "L" state, the AND circuit 27 does not output.
Counting circuit 42 is not reset.

[0042] Then, the operator closes the refueling nozzle 10 that has been removed as described above, and after confirming this, stores it in the nozzle storage section 11 again. As a result, the output side of the NOT circuit 32 goes to the "H" state as described above, and the AND circuit 25 becomes "H".
The pulse is repeatedly output from the oscillation circuit 48, and the AND circuit 3 is set to the "H" state only for a predetermined short time t0.
1. The motor 5 is repeatedly energized via the OR circuit 40. At this time, since the refueling nozzle 10 is closed, even if the pump 6 is driven, only the flow rate corresponding to the expansion of the refueling hose 9 will flow.

Further, when the knot circuit 32 is in the "H" state, this output is input to the AND circuit 24, and the flow rate measured by the flow meter 7 is outputted as a flow signal from the flow rate transmitter 8 each time, and the output is input to the AND circuit 24. 24 and is counted by a counting circuit 41. On the other hand, the comparison circuit 45 is connected to the storage circuit 43.
The predetermined flow rate stored in the refueling nozzle 10 is compared with the total amount of refueling counted by the counting circuit 41.
Since the valve is closed, the flow rate flowing through the flowmeter 7 is smaller than the predetermined flow rate, and the comparison circuit 45 does not output a coincidence signal. Therefore, the output side of the NOT circuit 33 is in the "H" state, and the gate of the AND circuit 28 is opened.

Furthermore, since the pulses from the oscillating circuit 48 are input to the counting circuit 49, when 5 pulses are inputted, the stored numerical value "5" of the memory circuit 50 coincides with the value "5" of the comparator circuit 51. A coincidence signal is output from the output terminal 51A, and becomes in the "H" state. As a result, the signal from the comparator circuit 51 is input to the reset terminal 48R of the oscillation circuit 48 to stop the oscillation from the oscillation circuit 48, and momentarily puts the AND circuit 28 in the "H" state via the trigger FF circuit 37. shall be. Therefore, the output from the AND circuit 28 is F
The signal is input to the reset terminal 47R of the F circuit 47, and the reset gate of the FF circuit 47 is opened to prepare for the next refueling operation. Along with this,
The output from the AND circuit 28 is input to the reset terminal 42R of the counting circuit 42 via the OR circuit 39, and the counting circuit 42 is reset. As a result, since the counting circuit 42 of the comparison circuit 46 is reset, the output of the quantitative signal from the output terminal 46A of the comparison circuit 46 is stopped. Therefore, AND circuit 2
Gates 4 and 25 are closed, and the knot circuit 34 is set to "H".
In this state, the gate of the AND circuit 30 is opened to prepare for the next refueling operation. As a result of the above, all the circuits have returned to their pre-operation state.

Furthermore, when the refueling nozzle 10 is housed in the nozzle storage part 11 with the valve closed after preset refueling, the same safety check as described above is automatically performed. Of course, since no coincidence signal is output, the operator does not notice this at all.

In this embodiment, by repeatedly driving the pump 6 with a minute discharge amount through time management, even when the refueling nozzle 10 is open, the pump 6 can be operated for a long period of time as shown in FIG. Compared to those that drive continuously,
As shown in FIG. 5, the amount of overflow after the valve opening is detected can be reduced, and therefore the amount of leakage can also be minimized. In particular, in the case where the matching signal is output from the comparison circuit 45 immediately after the predetermined number of pulses are output from the oscillation circuit 48, it is possible to substantially reduce the amount of overshoot to zero, and the amount of excess The amount of leakage can be reduced.

Moreover, in this embodiment, the safety confirmation operation for opening the nozzle valve is performed only during preset lubrication, and there is no need to perform this safety confirmation operation during normal lubrication, so that the next lubrication can be performed quickly. Become.

Note that in the above embodiment, the control circuit 2
0 has a circuit configuration as shown in the figure, the pump drive circuit includes a knot circuit 32, AND circuits 25, 31, and a transmission circuit 48, and the nozzle open detection circuit includes a counting circuit 41, a memory circuit 43, a comparison circuit 45, Constructed including an FF circuit 47,
The pump drive prohibition circuit is the NOT circuit 35 and the AND circuit 31.
However, the control circuit 20 is not limited to this, and the control circuit 20 may be configured by a microcomputer including a central processing unit (CPU), a memory circuit, etc., and the microcomputer may be configured to transmit a flow rate via an interface circuit. It may be connected to the device 8, the switch 12, the preset device 17, the alarm 21, the motor drive circuit 22, and the display drive circuit 23, and performs the refueling operation under program control. In this case, processing may be performed according to the flow shown in FIG.

Furthermore, the operation for checking whether or not the refueling nozzle 10 is open has been described as being carried out after the preset refueling is completed, that is, when the refueling nozzle 10 is hung in the nozzle storage portion 11 and the switch 12 is opened. However, it may be configured to be performed before the start of refueling, that is, when the refueling nozzle 10 is removed from the nozzle housing 11 and the switch 12 is closed. In this case, the NOT circuit 32 is abolished, the transmitting circuit 48 starts emitting pulses when the switch 12 is closed, and some circuit changes are made, such as inserting a delay timer on the output side of the AND circuit 29. At the start of the next refueling after preset refueling, the pump 6 is driven repeatedly to confirm that the nozzle is open, and only when the refueling nozzle 10 is normally closed, the pump is activated for refueling after the delay time set by the delay timer. This can be easily realized by using a configuration that performs driving. On the other hand, the number of times the pump is checked is not limited to five times, but may be any number of times.

Furthermore, the control circuit 20 is connected to the upper housing 3.
Although it has been described as being installed inside the gas station office, it may also be installed in the gas station office. On the other hand, although the preset oil supply device 17 has been described as being provided in the upper housing 3, it may also be provided in the middle of the oil supply nozzle 10 or the fuel supply hose 9 in the vicinity thereof, or it may be installed separately from the oil supply device on the office or island. A preset device panel may also be provided. Further, although the housing 1 constituting the oil supply device has been described as consisting of the lower housing 2 and the upper housing 3, this is for design reasons, and it goes without saying that the housing 1 may be composed of a single housing.

[0051]

[Effects of the Invention] The refueling device according to the present invention is as described in detail above, and automatically checks whether or not the refueling nozzle remains open after preset refueling is completed, and maintains the valve open. If this occurs, the next motor drive can be prohibited, so it is possible to reliably prevent accidents in which the pump is started during the next refueling operation with the refueling nozzle open, and to ensure safety. Since the confirmation operation is performed only during preset refueling, if the current refueling is normal refueling, the next refueling can be performed quickly.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a refueling device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration of a control circuit in FIG. 1;

FIG. 3 is an explanatory diagram of the operation in FIG. 2;

FIG. 4 is an overshoot amount characteristic diagram when the pump is driven once for a nozzle confirmation operation.

FIG. 5 is an overshoot amount characteristic diagram when the pump is driven many times for a nozzle confirmation operation.

FIG. 6 is a flow diagram for arithmetic processing.

[Explanation of symbols]

1 Housing 4 Piping 5 Motor 6 Pump 7 Flowmeter 8 Refueling nozzle 9 Refueling hose 11 Nozzle storage section 12 Switch 13 Display 17 Preset device 20 Control circuit 21　Alarm device 22 Motor drive circuit 23 Display drive circuit

Claims (1)

[Claims] At the time of refueling, refueling corresponding to a desired refueling amount or amount set in advance as a preset value is performed by a refueling nozzle via a pump driven by a motor and a flow meter, and when the refueling amount reaches the preset value, the refueling nozzle In a lubrication system equipped with a preset lubrication function that automatically stops the specified amount of lubrication by stopping the motor regardless of whether the valve is open, the amount of lubrication reached the preset value and the motor stopped at a fixed amount, causing the current lubrication to stop. a preset lubrication determination means for determining that the current refueling is preset lubrication; a nozzle detection means for detecting whether the refueling nozzle has been returned to or removed from a predetermined accommodating portion; and a nozzle detection means for detecting whether the current refueling is preset lubrication. and a pump driving means for driving the pump by energizing the motor for a predetermined time when the nozzle detection means outputs a detection signal. a nozzle valve open detection means that compares the total measured flow rate with a preset predetermined flow rate and outputs a signal when the total measured flow rate reaches the predetermined flow rate; and a signal from the detection means is inputted. and pump drive prohibition means for outputting a drive stop signal to the pump drive means and prohibiting energization of the motor when the motor is activated.