JPS6215437B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluid supply device, such as a fuel supply device used at a gas station.

In recent years, oil supply devices equipped with a preset device have become popular. As is well known, a preset oil supply device automatically stops oil supply when a preset amount or amount of oil has been filled. In this case, the oil supply is usually stopped by closing a solenoid valve provided in the oil feed path or by deenergizing the oil feed pump.

By the way, many refueling nozzles are designed to refuel by opening a built-in valve by operating a lever, but when refueling is performed with the lever locked in the valve open position and the preset amount of refueling is completed, refueling stops. At this time, it is necessary to release the lock of the lever and return the built-in valve to the closed state. If you forget to close the valve of the refueling nozzle and put the nozzle in the nozzle case, and then take it out of the case for the next refueling, the pump will be driven, the solenoid valve in the flow path will open, and oil will spray out from the tip of the nozzle. It is dangerous.

In order to prevent such a risk, the amount of liquid larger than a predetermined amount (the amount absorbed by the expansion of the hose) within a predetermined time after the means for sending liquid to the refueling nozzle starts operating. is measured by the flowmeter, it is determined that the liquid is being discharged from the nozzle, and the valve inserted in the liquid supply channel is closed, or the operation of the liquid supply means is stopped. He first proposed a device that stopped the liquid (patent application 1973-
No. 122271).

However, even with this configuration, there is still a risk that liquid may be ejected from the nozzle due to delay in relay or valve operation or inertia of the motor.

The present invention completely eliminates such risks, and provides a liquid supply device that includes a liquid supply nozzle, a means for sending liquid to the liquid supply nozzle, and a flow meter provided in the liquid supply flow path. , controlling the liquid feeding amount or liquid feeding speed for a predetermined time after the start of operation of the liquid feeding means,
If a liquid flow exceeding a predetermined amount is detected during this time, the liquid supply is stopped.

That is, according to the present invention, for a predetermined period of time, for example, about 1 second after the means for feeding liquid to the nozzle, such as a pump, starts to be driven, the liquid is fed at a flow rate or flow rate smaller than the flow rate or flow rate during normal refueling. Therefore, even if the nozzle valve is open, the liquid will not be ejected from the nozzle until the liquid feeding is stopped due to rotation due to the inertia of the motor or delay in the operation of the relay or valve.

The illustrated embodiment will be described below.

In FIG. 1, 1 is a housing of a ground-mounted oil supply system, and 2 is an oil feed pump, which is driven by a motor 3 and pumps up oil from an underground oil storage tank (not shown) through a pumping pipe 4 and an oil feed path 5. send to 6 is a flow meter installed in the oil feed path 5, which measures the amount of oil fed;
Its output is input to the oscillator 7. 8 is a refueling hose, and 9 is a refueling nozzle attached to the tip of the refueling hose 8.

Reference numeral 10 denotes a control section, an example of which has a circuit configuration as shown in FIG. 2, and performs the operations described below.
11 is a display device.

12 is a keyboard for presetting, and 13 is a nozzle case which is a liquid supply standby position provided in the refueling device housing 1, and the refueling nozzle 9 is housed therein. When the refueling nozzle 9 is removed, the nozzle switch 14 is operated, and the nozzle switch 14 is operated. A signal (nozzle signal) B is input to the control section 10.

The configuration of the control unit 10 is shown in FIG. 2, and the desired amount of oil (for example, 20 liters)
When the signal A is set in advance (preset), the preset circuit 12' outputs the corresponding signal A.

When the nozzle 9 is removed from the nozzle case 13, the nozzle switch 14 generates a signal B.
is applied to motor control circuit 15 and timer circuit 16. Timer circuit 1 is activated by inputting signal B.
6 starts the timing operation, and continuously outputs the timing signal C for a predetermined relatively short period of time (for example, 1 second).
Output. Signal B is also applied as a reset signal to addition counter AC and subtraction counters _SC1 and _SC2 , causing these counters to return to zero.

The clock signal C is applied via the branch circuit 17 to the motor control circuit 15 on the one hand as a small current signal C', and on the other hand to the determination circuit 18 as an actuation signal C''.

The motor control circuit 15 receives signals B and C' to energize the motor 3 at a rotational speed such that the pump 2 pumps oil at a relatively small flow rate. As the motor 3 rotates, the pump 2 sends the pumped oil to the oil feed path 5 via the pump pipe 4. Therefore, if the built-in valve (not shown) of the oil supply nozzle 9 remains open, oil will be discharged from the nozzle tip. This invention attempts to prevent such a situation from occurring.

The amount of oil flowing through the oil feed path 5 is measured by a flowmeter 6, and a corresponding signal (flow rate pulse) D is transmitted from a transmitter 7. It is assumed that the flow rate pulse D is transmitted at one pulse every 1/100 liter, for example. Flow rate pulse D is applied to counters AC, SC ₁ and SC ₂ and decision circuit 18 .

The determination circuit 18 receives pulses equal to or greater than the number of flow rate pulses (4 pulses) for a predetermined relatively small oil supply amount (4/100 liters, for example) while the operation signal C'' is input (for example, 1 second). When this occurs, it is determined that the built-in valve of the oil supply nozzle 9 remains open or that there is a leak in the oil supply path 5, etc., and a stop signal E is output, and the motor 3 is stopped via the motor control circuit 15. Deenergize and stop the pump 2. In this case, the signal E may be output immediately when a predetermined number of pulses (four in the above example) are counted, or for a predetermined period of time (one second in the above example). ) may be outputted, the signal E may be output.

In any case, until signal E is output, motor 3
Since the motor rotates at a low speed so as to deliver oil at a small flow rate, oil will not be ejected from the nozzle due to inertia before the motor stops. The predetermined oil supply amount (for example, 4/100 liters) or the corresponding number of pulses (4) is variably set by the setting circuit 19 and provided to the determination circuit 18.

The setting of the predetermined time (the duration of the signals C, C', and C'') in the timer 16 depends on the following circumstances. That is, when refueling is performed, the transmitter 7 sends a flow rate pulse corresponding to the amount of refueling. Signal D is output, but if the built-in valve of refueling nozzle 9 is closed, this flow rate pulse signal D should not be output.However, in reality, since the refueling hose 8 is elastic, the pump is not driven. Then, the hose is pushed and expanded by the oil pressure until it reaches its expansion limit, and a small amount of oil moves toward the oil supply nozzle 9, so even if the nozzle's built-in valve is closed, a flow rate pulse D corresponding to this flow rate is generated. Therefore, the valve of the refueling nozzle 9 is in the open state only when a flow rate pulse signal D equal to or greater than the flow rate that pushes the refueling hose 8 is counted while the signal C is output from the timer 16. Alternatively, it is determined that there is a leak in the oil supply hose 8 and the pump motor 3 is deenergized.

In addition, the timer setting time is shorter than the time normally required from removing the nozzle from the nozzle case to inserting the refueling port (usually about 1 second).
Set.

When the pump 2 is stopped, the built-in valve of the nozzle 9 is closed, the nozzle is returned to the case, and the nozzle is taken out again for refueling. If there is a leak in the flow path, etc., take necessary repair measures.

When the nozzle 9 is taken out from the nozzle case 13 and the flow rate pulses D of the predetermined number or more are not counted while the signal C from the timer 16 remains, the signal E is not output, so refueling is performed by operating the nozzle lever. be able to. In this case, the signal C,
Therefore, while C' exists (1 second in the above example)
motor 3 rotates at low speed, but this signal C
When (C') disappears (after 1 second), normal rotation returns.

As refueling progresses, the signal D (flow rate pulse) from the transmitter 7 is counted by the addition counter AC as described above, and this counted value is sent to the display drive circuit 20.
is displayed on the display 11 via.

A signal A corresponding to the preset oil supply amount (20 liters in the above example) from the preset circuit 12' is stored in the subtraction counter _SC1 and is also applied to the arithmetic circuit 21.

The small flow rate refueling amount setting circuit 22 sets the last predetermined amount (for example, the last 0.2 liters) of the preset refueling amount (20 liters in the above example) to be refueled at a small flow rate, and sets this set value. It is given to the arithmetic circuit 21. The arithmetic circuit 21 gives the difference between the values of both inputs (20 liters - 0.2 liters = 19.8 liters) to the subtraction counter _SC2 and stores it there.

The flow rate pulse D is calculated by the subtraction counter SC ₁ as described above.
and SC ₂ and their respective memory values (SC ₁
is subtracted from 20 liters and SC ₂ is 19.8 liters). 19.8 liters of fuel has been added to the counter.
When the subtraction value in SC ₂ becomes 0, this counter generates a signal (lubricating signal with a small flow rate) f, and this signal f is given to the motor control circuit 15 to decelerate the motor 3 and cause it to perform lubricating with a small flow rate. .

If 0.2 liters of oil is refilled at a small flow rate, this means that a total of 20 liters of oil has been refilled, and the subtraction counter _SC1 will have a subtraction value of 0, so
A signal (motor stop signal) g is output, and the motor 3 is stopped via the motor control circuit 15.

FIGS. 3 and 4 show other embodiments. Figure 1,
In the embodiment shown in FIG. 2, switching between small flow rate and large flow rate is performed by changing the rotational speed of the pump drive motor 3, but in FIGS. Switching between large and small flow rates is achieved by selectively controlling the opening and closing of the inserted large flow valve V ₁ and the small flow valve V ₂ inserted in the small flow passage 5' connected to bypass this valve V ₁ . I'm trying to control it. In FIGS. 3 and 4, the same reference symbols as in FIGS. 1 and 2 indicate corresponding components or signals, and a description thereof will be omitted.

Signal B from nozzle switch 14 energizes motor 3 and is applied to small flow valve control circuit 23 to open small flow valve _V2 . Since the large flow valve V ₁ is closed at this time, the oil is sent to the nozzle 9 at a small flow rate through the small diameter bypass passage 5'.

Timing signal C (lasting for example 1 second) from timer circuit 16 by signal B causes control signal C' and actuation signal C'' to rise from branch circuit 17. Control signal C' is applied to high flow valve control circuit 24. and the actuation signal C'' is given to the determination circuit 18.

The large flow valve control circuit 24 generates a signal to open the large flow valve _V1 at the falling edge of the control signal C'.

The determination circuit 18 receives flow rate pulses D from the transmitter 7 during the duration of the activation signal C'', which is equal to or greater than the number of pulses predetermined by the setting circuit 19 (for example, 4 pulses corresponding to 4/100 liters). Then, it is determined that the valve of the nozzle 9 is open, and a close signal E is output.

The signal E is applied to the small flow valve control circuit 23 to close the small flow valve _V2 , and is also applied to the large flow valve control circuit 24 to prevent the generation of the large flow valve opening signal due to the fall of the signal C'. Large flow valve V ₁
to remain closed.

Until the signal E is output, oil is only fed at a small flow rate through the bypass passage 5'.
Even if there is a delay in the closing operation of the small flow valve _V2 , oil will not spout from the nozzle.

When the small flow valve V ₂ is closed, the built-in valve of the nozzle 9 is closed, and the nozzle is returned to the nozzle case 13 and removed again for refueling. At this time, a signal from the nozzle switch 14 (reset signal)
B is input to the determination circuit 18, and if the signal E exists first, it is erased. Therefore, when the signal C' falls, the large flow valve _V1 is opened.

Remove the nozzle from the nozzle case and set the timer 16.
If the predetermined number or more of flow rate pulses D are not generated while the clock signal C continues, the signal E is not output, so the nozzle 9 is operated to supply oil.
At this time, while the timing signal C from the timer 16 continues (1 second in the above example), only the small flow valve V ₂ is opened, and after the signal C disappears, both the small flow valve V ₂ and the large flow valve V ₁ are opened. be opened.

When, for example, 19.8 liters of the preset oil supply amount (for example, 20 liters) is refueled, the large flow valve _V1 is closed by the signal f from the subtraction counter _SC2 .
When the remaining 0.2 liter of oil has been filled with a small flow rate, the signal g from the subtraction counter SC ₁ turns on the small flow valve V _2.
is closed.

Although the embodiments have been described above, the present invention is not limited thereto. For example, the refueling nozzle may have no built-in valve and may be configured to control a valve or a motor within the refueling machine housing by operating a lever on the nozzle. Switching between the small flow rate and the large flow rate may be performed by opening and closing a valve (which may also be used as a relief valve) inserted into a bypass path that communicates the primary side and secondary side of the pump 2.

The refueling device is not limited to a ground-mounted type, and may be, for example, a ceiling-suspended type. In this case, instead of a nozzle switch, for example, a control switch for the hose lifting mechanism,
Alternatively, a switch or the like operated in conjunction with the lifting/lowering operation can be used.

In addition, in the case of a lubricating device that does not include a preset device, for example, in order to accurately stop lubricating at a desired lubricating amount, the nozzle valve is throttled a little before the desired lubricating amount is reached, and lubricating is performed at a small flow rate. The present invention can also be applied to a refueling device configured to stop refueling when the refueling amount reaches a predetermined amount after the change to . Furthermore, the present invention can be implemented not only in oil supply devices but also in a wide range of liquid supply devices.

As described above, according to the present invention, even if there is a mistake in operating the liquid supply device, such as forgetting to close the built-in valve of the liquid supply nozzle, the risk of liquid spewing out from the nozzle at the start of liquid supply can be completely prevented. be able to.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing the configuration of an embodiment of the present invention, FIG. 2 is a block diagram of the control section of the device, and FIG.
1 and 4 correspond to FIG. 1 and FIG. 2, respectively, and are diagrams showing other embodiments. DESCRIPTION OF SYMBOLS 1... Housing, 2... Pump, 3... Pump motor, 4... Sumpling pipe, 5... Oil supply path, 5'...
...Bypass path, 6...Flow meter, 7...Flow rate pulse transmitter, 10...Control unit, 11...Display device, 12
...Keyboard, 12'...Preset circuit, 1
3... Nozzle case, 14... Nozzle switch,
15... Motor control circuit, 16... Timer circuit, 17... Branch circuit, 18... Judgment circuit, 19
... Judgment time setting circuit, 20 ... Display drive circuit, 21 ... Arithmetic circuit, 22 ... Oil supply amount setting circuit based on small flow rate, 23 ... Small flow rate valve control circuit, 24
...Large flow valve control circuit, V ₁ ...Large flow valve, V ₂ ...
…Small flow valve, AC…addition counter, SC ₁ , SC ₂ …
...subtraction counter.

Claims (1)

[Scope of Claims] 1. A liquid supply nozzle having a built-in valve, a liquid supply hose connected to this liquid supply nozzle, and a liquid supply flow path that sends liquid to the liquid supply nozzle via this liquid supply hose, A pump inserted into this liquid feeding channel, a driving motor for this pump, a flow meter inserted into the liquid feeding channel, and a number of flow pulses corresponding to the amount of liquid measured by this flow meter. A liquid supply device comprising a flow rate pulse transmitter, a display, and a nozzle switch that generates and extinguishes an operation signal in accordance with the start and end of a liquid supply operation by the liquid supply nozzle, A timer circuit that performs a timing operation upon input of an operation signal and generates a timing signal for a time that is within the time normally required for the operation of moving the liquid supply nozzle from the liquid supply standby position and inserting its tip into the liquid supply port. a control circuit for controlling the rotation of the motor; and a control circuit for controlling the rotation of the motor; and a control circuit for controlling the liquid supply flow until the hose reaches its expansion limit by the liquid supply driven by the pump while the built-in valve of the liquid supply nozzle is closed. a setting circuit that sets the number of flow pulses corresponding to the amount of liquid flowing through the channel, and a pulse that is equal to or greater than the set number of pulses of the setting circuit is input from the flow rate pulse generator while a timing signal is being input from the timer circuit; a determination circuit that outputs a stop signal for the motor when the timing signal is input; A liquid supply device characterized in that it is configured as follows. 2. A liquid supply nozzle having a built-in valve, a liquid supply hose connected to this liquid supply nozzle, a liquid supply flow path that sends liquid to the liquid supply nozzle via this liquid supply hose, and a liquid supply flow path connected to this liquid supply flow path. An inserted pump, a driving motor for this pump, a flow meter inserted in the liquid sending channel, and a flow rate pulse generator that transmits a number of flow pulses according to the amount of liquid measured by this flow meter. a large flow rate valve inserted in the liquid feeding flow path, a small flow valve connected to the liquid feeding flow path bypassing the large flow rate valve, an indicator, and a liquid supplying liquid by the liquid feeding nozzle. In a liquid supply device equipped with a nozzle switch that generates and extinguishes an operation signal according to the start and end of an operation, the liquid supply nozzle is moved from a liquid supply standby position by a timing operation upon input of an operation signal from the nozzle switch. a timer circuit that generates a timing signal for a time that is within the time normally required for the operation of moving the cylinder tip and inserting the tip into the liquid supply port; a control circuit that controls rotation of the motor; and a built-in liquid supply nozzle. a setting circuit that sets a flow rate pulse number corresponding to the amount of liquid flowing through the liquid sending channel until the hose reaches its expansion limit due to liquid feeding by driving the pump when the valve is closed; a small flow valve control circuit that opens the small flow valve upon input of an operation signal from a nozzle switch; a large flow valve control circuit that opens the large flow valve upon disappearance of a timing signal from the timer circuit; A valve closing signal is sent to the large flow valve control circuit and the small flow valve control circuit when pulses equal to or greater than the set number of pulses of the setting circuit are input from the flow rate pulse generator while a timing signal is being input from the timer circuit. A liquid supply device characterized by comprising: a determination circuit for supplying a liquid;