JPS6215438B2 - - 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 lever and return the built-in valve to the closed state.If you forget to close the valve of the refueling nozzle and store the nozzle in the nozzle case, When the nozzle is removed from the case for refueling, the pump is driven and the solenoid valve in the flow path opens, causing dangerous oil to spout from the nozzle tip.

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. 22271).

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.

This invention completely eliminates such a risk, and includes a liquid supply nozzle, a liquid supply channel that sends liquid to this liquid supply nozzle, a pump inserted in this liquid supply channel, and a liquid supply nozzle. A pump drive motor, a flow meter inserted in the liquid supply flow path, a display, and a nozzle switch that generates and eliminates an operation signal in accordance with the start and end of a liquid supply operation by the liquid supply nozzle. In the liquid supply device, the amount or speed of liquid feeding is limited for a predetermined period of time after the pump starts operating, and when the predetermined period of time has elapsed within this period, the primary side or the secondary side of the pump is When the pressure in the liquid feeding flow path is below a predetermined value, the liquid supply is stopped.

That is, according to the present invention, for a predetermined period of time after the pump that sends liquid to the nozzle 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, so even if the nozzle valve is Even if the nozzle opens, liquid will not be ejected from the nozzle due to rotation due to the inertia of the motor or delays in the operation of relays and valves until the liquid supply stops.

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.

Reference numeral 12 represents a preset keyboard, and 13 represents a nozzle case provided in the refueling device housing 1, in which the refueling nozzle 9 is housed. When the refueling nozzle 9 is removed, the nozzle switch 14 is operated, and an operation signal (nozzle signal) is generated. It is input to the control unit 10.

A pressure detector 23 is connected to the primary side (indicated by a solid line) or the secondary side (indicated by a chain line) of the pump 2. The detector 23 detects the pressure on the primary side or the secondary side of the pump 2 and outputs a corresponding electric signal H. 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.

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.

Nozzle case 1 with nozzle 9 in standby position for refueling
3, the nozzle switch 14 generates a signal B, which is applied to the motor control circuit 15 and the timer circuit 16. Upon input of the signal B, the timer circuit 16 starts timing operation, and continuously outputs the timing signal C for a relatively short period of time determined in advance.
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 rise of the clock signal C causes the signal generation circuit 17 to generate a small flow rate signal C', and this signal C' is applied to the motor control circuit 15. When the clock signal C falls, the signal generation circuit 17 generates the actuation signal C'', and after a slight time delay, a small flow signal is generated.
Make C′ disappear. The activation signal C'' causes the determination circuit 18 to make a determination operation as described below.The time delay in the disappearance of the small flow rate signal C' is set to be longer than the time required for the determination circuit 18 to complete the determination operation described below. .

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.

By the way, since the hose 8 is elastic, even if the built-in valve of the nozzle 9 is closed at this time, the hose 8
The oil flows toward the nozzle 9 by the amount that expands. Therefore, the pressure on the primary side of the pump 2 temporarily decreases (becomes a negative pressure), but if the built-in valve of the nozzle 9 is closed, oil will not flow toward the hose at the limit of expansion of the hose 8. The gas is refluxed and circulated from the secondary side to the primary side of the pump 2 via a relief valve (not shown), and the pressure on the primary side of the pump returns to its original level. However, if the built-in valve of the nozzle 9 is open, oil will continue to be discharged from the nozzle 9 and the pressure on the primary side of the pump 2 will therefore remain reduced (negative pressure).

On the secondary side of the pump 2, when the built-in valve of the nozzle 9 is closed, oil flows toward the nozzle 9 by the amount that the hose 8 expands, but at the limit of the hose 8's tension, the oil flows to the secondary side of the pump. The pressure increases to the set pressure of the relief valve. However, if the nozzle's built-in valve is open, the pressure on the secondary side of the pump will not increase.

Therefore, when the time required for the hose to reach its expansion limit after pump 2 starts operating, for example, 0.2 seconds has passed (when the duration of clock signal C is 0.2 seconds and its fall), When the pressure in the liquid feeding path 5 on the next side is below a preset value, the pump motor 3 is stopped.

That is, the determination circuit 18 determines whether the pressure sensor 2
3 (the current pressure on the primary or secondary side of the pump 2) and a signal I from the setting circuit 19 (the current pressure of the pump 2 when the nozzle built-in valve is open to allow oiling at the minimum flow rate). (pressure on the primary side or secondary side), and if the former is less than the latter,
It determines that the built-in valve of the nozzle 9 remains open or that there is a leak in the oil feed path 5, etc., outputs a stop signal (pulse signal), and de-energizes the motor 3 via the motor control circuit 15. Stop pump 2.

The set value in the setting circuit 19 is, for example, -20 mmHg when the detector 23 is installed on the primary side of the pump.
Also, when installed on the secondary side of the pump,
For example, it is 2Kg/ ^cm2 . Further, this setting value can be changed as necessary.

The timer setting time (about 0.2 seconds) is longer than the time normally required (usually about 1 second) to take the nozzle out of the nozzle case, that is, to move it from the refueling standby position and insert the tip into the refueling port. It's also short.

When the pump 2 is stopped, the built-in valve of the nozzle 9 is closed, the nozzle 9 is returned to the case 13, and the nozzle 9 is taken out again for refueling. If there is a leak in the flow path, etc., take necessary repair measures.

Fall of clock signal C (occurrence of actuation signal C'')
At this point, if the value of the signal H from the pressure detector 23 is greater than or equal to the value of the signal I from the setting circuit 19, the built-in valve of the nozzle 9 is closed and there is no leakage in the flow path, so a stop signal is issued. E is not transmitted. In this case, the motor control circuit 15 switches the motor 3 from the small flow rate to the normal flow rate at the fall of the small flow rate signal C' (slightly delayed from the fall of the clock signal C as described above). Then, the nozzle 9 is operated to supply oil.

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

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 supplies 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 pulse D is also applied to calculation counters SC ₁ and SC ₂ and subtracted from their respective stored values (SC ₁ is 20 liters, SC ₂ is 19.8 liters). 19.8
When a small amount of oil is refilled and the subtraction value in the counter SC ₂ becomes 0, this counter generates a signal F (refueling signal due to a small flow rate), and this signal F decelerates the motor 3 applied to the motor control circuit 15. to perform lubrication at a small flow rate.

When 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 value of calculation counter _SC1 becomes 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. The inserted large flow valve V ₁ and this valve V ₁
The switching control between large and small flow rates is performed by selectively controlling the opening and closing of a small flow valve _V2 inserted in a small flow passage 5' connected to bypass the flow rate. Figures 1 and 2 in Figures 3 and 4.
The same reference symbols as in the drawings indicate corresponding components or signals, and a description thereof will be omitted.

A signal B from the nozzle switch 14 generated when the nozzle 9 is removed from the nozzle case 13 energizes the motor 3 and is applied to the small flow valve control circuit 25 to open the small flow valve _V2 . At this time, the large flow valve
Since V ₂ is closed, oil is sent to the nozzle 9 at a small flow rate through the small diameter bypass channel 5'.

When the clock signal C from the timer circuit 16 (for example, continues for 0.2 seconds) falls due to the signal B, the signal generation circuit 17 generates the activation signal C'' and, after a slight time delay, generates the control signal C'. Control signal C' is applied to the large flow valve control circuit 24, and the actuation signal C'' is applied to the determination circuit 18. The large flow valve control circuit 24 generates a signal to open the large flow valve _V1 upon input of the control signal C'.

The determination circuit 18 determines that the value of the signal H from the pressure detector 23 at the time of input of the actuation signal C″ is set to the setting circuit 1.
When the value is less than the value of the signal I from the nozzle 9, 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 25 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 input of the signal C'. Keep the high flow valve V ₁ 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 then 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, the large flow valve _V1 is opened by inputting the signal C'.

Remove the nozzle from the nozzle case and set the timer 16.
When the value of signal H is greater than or equal to the value of signal I at the time when clock signal C falls from , signal E is not output, so nozzle 9 is operated to refuel. At this time, only the small flow valve V ₂ is opened until the control signal C' is given to the large flow valve control circuit 24, and the
After C′ is given, the small flow valve V ₂ and the large flow valve
Both V ₁ are 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 oil supply nozzle, it is possible to completely prevent the risk of liquid spewing out from the nozzle at the start of liquid supply. I can do it.

[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... Signal generation circuit, 18... Judgment circuit,
19...Setting circuit, 20...Display drive circuit, 2
DESCRIPTION OF SYMBOLS 1... Arithmetic circuit, 22... Oil supply amount setting circuit based on small flow rate, 25... Small flow rate valve control circuit, 24... Large flow rate valve control circuit, 23... Pressure detector, 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 channel for sending liquid to the liquid supply nozzle, a pump inserted in the liquid supply channel, and a drive motor for the pump, In a liquid supply device comprising a flow meter inserted in the liquid supply channel, a display, and a nozzle switch that generates and extinguishes an operation signal according to the start and end of a liquid supply operation by the liquid supply nozzle. , the timing signal is operated for a time period 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 by performing a timing operation in response to the input of an operation signal from the nozzle switch. a timer circuit that generates the rotation of the motor; a control circuit that controls the rotation of the motor; a setting circuit that sets a pressure corresponding to the liquid pressure on the side; and a pressure detector that is connected to the liquid feeding channel on the primary side or the secondary side of the pump and detects the pressure on the primary side or the secondary side. and a determination circuit that outputs a stop signal for the motor when the pressure detected by the pressure detector becomes equal to or less than the set pressure of the setting circuit while the time signal is being output from the timer circuit. Liquid supply device. 2. A liquid supply nozzle having a built-in valve, a liquid supply channel for sending liquid to this liquid supply nozzle, a pump inserted in this liquid supply channel, a motor for driving this pump, and the liquid supply channel. a flow meter inserted in the liquid supply flow path, a large flow valve inserted in the liquid feed flow path, a small flow valve connected to the liquid feed flow path bypassing the large flow valve, an indicator; In a liquid supply device equipped with a nozzle switch that generates and extinguishes an operation signal according to the start and end of a liquid supply operation by a liquid supply nozzle, the liquid supply nozzle a timer circuit that generates a timing signal for a time that is within the time normally required to move the motor from the liquid supply standby position and insert the tip of the cylinder into the liquid supply port; a control circuit that controls the rotation of the motor; a setting circuit that sets a pressure corresponding to the hydraulic pressure on the primary side or secondary side of the pump when the built-in valve of the liquid supply nozzle is open to the extent that liquid can be supplied at a minimum flow rate; a pressure detector connected to the liquid feeding channel on the primary side or the secondary side and detecting the pressure on the primary side or the secondary side; and the small flow valve based on the input of the operation signal from the nozzle switch. a small flow valve control circuit that opens the valve; a large flow valve control circuit that opens the large flow valve based on the completion of timing of the timer circuit; a determination circuit that provides a valve closing signal to the large flow valve control circuit and the small flow valve control circuit when the detected pressure by the sensor becomes equal to or lower than the set pressure of the setting circuit.