JPS6241959B2 - - 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. 22271).

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

The present invention completely eliminates such a risk, and includes a liquid supply nozzle, a liquid supply hose connected to the liquid supply nozzle, and a liquid supply system that supplies liquid to the liquid supply nozzle via the liquid supply hose. A liquid sending channel, a pump inserted in this liquid sending channel, a driving motor for this pump, a flowmeter inserted in the liquid sending channel, and a flowmeter according to the amount of liquid measured by this flowmeter. A liquid supply device comprising: a flow rate pulse transmitter that transmits a number of flow rate pulses; 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. , when the amount or speed of liquid feeding is limited for a predetermined period of time after the pump starts operating, and a liquid flow is detected in the liquid feeding channel at the lapse of a predetermined time within this time; In this case, 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. The transmitter 7 emits a number of pulses (flow rate pulses) proportional to the measured value by the flow meter 6. 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.
Reference numeral 11 denotes a display device that displays the amount of oil supplied using the flow rate pulse from the transmitter 7.

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

An example of the configuration of the control unit 10 is shown in FIG.
When the signal A is preset, the preset circuit 12' outputs a corresponding signal A.

Nozzle case 1 with nozzle 9 in standby position for refueling
3, nozzle switch 14 generates signal B, which is applied to motor control circuit 15 and timer circuits 16a and 16b.
By inputting signal B, timer circuits 16a and 1
6b simultaneously starts a timing operation. The timer circuit 16a continuously generates the small flow rate refueling signal Ca for a predetermined specific effective short time Ta (for example, one second after the start of timing). On the other hand, the timer circuit 16b outputs an activation signal Cb at the time when a predetermined time Tb (for example, 0.2 seconds after the start of time measurement) has elapsed within the time Ta.
occurs.

Nozzle 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 small flow rate lubrication signal Ca from the timer 16a is given to the motor control circuit 15, while the timer 16
The actuation signal Cb from b is given to the determination circuit 18.

The motor control circuit 15 receives signals B and Ca 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. At this time, if the built-in valve (not shown) of the oil supply nozzle 9 is closed, oil should not flow through the oil supply path 5, but since the hose 8 has elasticity, the nozzle Even when the built-in valve is closed, oil flows toward the nozzle 9 by the amount that the hose 8 expands, and when the expansion limit is reached, the oil flow stops. Therefore, if oil flow is still detected in the oil feed path 5 after the time required for the hose 8 to expand (usually about 0.2 seconds) after the pump 2 starts operating, the nozzle It may be assumed that the built-in valve is open or there is a leak in the oil feed line 5.

According to the present invention, the time required for the expansion of the hose is set as the time Tb of the timer 16b, and at the time when this time elapses, the determination circuit 18 operates to determine the presence or absence of oil flow in the oil feed path 5 based on the activation signal Cb. Let it happen.

For this reason, in the illustrated example, the flow rate pulse D from the flow rate pulse generator 7 is given to the determination circuit 18. The determination circuit 18 receives the activation signal Cb from the timer circuit 16b.
The signal from the timer circuit 16a from the time when the signal is received.
When a flow rate pulse exceeding a reference number is received from the transmitter 7 until Ca disappears, it is determined that oil is flowing through the oil pipe 5, hose 8, and nozzle 9, and a stop signal E is generated. This reference number of pulses may be the number necessary to detect the flow of oil through the oil pipe 5, hose 8, and nozzle 9, that is, theoretically, it may be one, but an appropriate number should be set to avoid malfunction. The number of pieces is variably set by the setting circuit 19, and the judgment circuit 1
given to 8.

The stop signal E is applied to the motor control circuit 15 to deenergize the motor 3 and stop the pump 2. In this case, until the motor 3 is deenergized, the motor 3 is rotating at a low speed to feed oil at a small flow rate as described above, so a large amount of oil is pumped due to inertia before the pump 2 stops. Oil will not spout out from the nozzle.

The set time Ta of the timer 16a is set to be shorter (about 1 second) than the time normally required from taking out the nozzle 9 from the nozzle case 13 to inserting it into the refueling port, and the set time Tb of the timer 16b is set to This is even shorter than this, and is set to the time normally required (approximately 0.2 seconds) for the hose 8 to reach its expansion limit due to the operation of the pump 2 when the built-in valve of the nozzle is closed as described above.

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.

If a flow rate pulse D equal to or greater than the reference number is not given to the determination circuit 18 between the generation of the signal Cb from the timer 16b after the nozzle 9 is taken out from the nozzle case 13 and the disappearance of the signal Ca from the timer 16a, the signal Since E is not output, refueling can be performed by operating the nozzle lever. In this case, while the signal Ca is present (in the previous example 1
motor 3 rotates at low speed, but this signal
When Ca runs out (after 1 second), normal rotation returns.

As the refueling progresses, the signal D (flow rate pulse) from the transmitter 7 is counted by the addition counter AC, and this counted value (refueling amount) 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 (for example, 20 liters) from the preset circuit 12' is stored in the subtraction counter _SC1 (after being returned to zero by the reset signal B) 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 applies the difference between the values of both inputs (20 liters - 0.2 liters = 19.8 liters) to the subtraction counter _SC2 and inputs it thereto (reset signal B).
(after being returned to zero by).

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 ₁ 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 (a small flow rate lubrication signal) F, and this signal F is given to the motor control circuit 15 to decelerate the motor 3 and cause it to perform small flow rate lubrication. .

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'.

As in the previously described embodiments, the nozzle signal B
The timer circuits 16a and 16b start timing operation, and when time Tb (for example, 0.2 seconds) has elapsed, the timer circuit 16b generates an activation signal Cb,
When the time Ta (for example, 1 second) has elapsed, the timer circuit 16a provides the valve opening signal H to the large flow valve control circuit 24. Upon receiving this signal H, the large flow valve control circuit 24 generates a signal to open the large flow valve _V1 .

Upon receiving the signal Cb from the timer circuit 16b, the determination circuit 18 operates and the timer circuit 16a
If a flow rate pulse D equal to or greater than the reference pulse number set by the setting circuit 19 is received from the transmitter 7 from and outputs the valve closing signal E.

The signal E is given to the small flow valve control circuit 23 to close the small flow valve _V2 , and is also given to the large flow valve control circuit 24 to prevent the signal H from generating the large flow valve opening signal and to close the small flow valve V2. Keep 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 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. The generation of signal H therefore opens the high flow valve _V1 .

Remove the nozzle from the nozzle case and set the timer 16.
If a flow rate pulse D equal to or greater than the reference number is not given to the determination circuit 18 between the generation of the signal Cb from the timer circuit 16a and the generation of the signal H from the timer circuit 16a, the signal E will not be output. Operate to refuel. At this time, only the small flow valve V ₂ is opened until the large flow valve opening signal H is generated from the timer 16a (1 second in the above example), and after the signal H is generated, the large flow valve is opened in addition to the small flow valve V ₂ . Both valves 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 I from the subtraction counter _SC2 .
When the remaining 0.2 liter of oil has been filled with a small flow rate, the signal J from the subtraction counter SC ₁ turns on the small flow valve V _2.
is closed.

In the embodiments described above, the liquid flow is detected by the flow pulse D from the transmitter 7, but it may also be by a suitable flow detector 25 connected to the secondary side of the pump. Such a flow detector 25 is shown by a chain line in the figure, and in this case, a connection line from the transmitter 7 to the determination circuit 18 is unnecessary. Furthermore, depending on the configuration of the flow detector 25, the setting circuit 19 can also be omitted.

Note that the flow detector 25 is connected downstream (on the flowmeter 6 side) of a secondary side connection point of a return pipe (not shown) that communicates the secondary side of the pump with the primary side.

The operation of the device based on the flow detection signal from the flow detector 25 can be easily understood from what has already been described, so the explanation will be omitted.

Further, 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,
A: Preset oil supply amount signal, B: Nozzle signal, Ca: Small flow oil supply signal, Cb: Operation signal,
D...Flow rate pulse, E...Stop signal, F...Small flow refueling signal, G...Stop signal, H...Large flow valve open signal, I...Large flow valve close signal, J...Small flow valve Close signal, V ₁ ... large flow valve, V ₂ ... small flow valve.

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 B in accordance with the start and end of a liquid supply operation by the liquid supply nozzle, comprising the steps of: a timer circuit that performs a timing operation upon input of the operation signal B and generates a small flow rate liquid supply signal Ca during the time normally required for the operation of moving the liquid supply nozzle from the liquid supply standby position and inserting it into the liquid supply port; a control circuit that controls the rotation of the motor; and a control circuit that controls the liquid supply flow path until the hose reaches its expansion limit by the liquid supply driven by the pump when the built-in valve of the liquid supply nozzle is closed. a setting circuit for setting a predetermined number of pulses that is at least one more than the number of flow pulses corresponding to the flowing flow rate; and the small flow liquid supply signal from the timer circuit.
a determination circuit that outputs a stop signal E for the motor when a pulse number equal to or greater than the set pulse number of the setting circuit is input from the flow rate pulse generator during output of Ca; A liquid supply device characterized in that, while a liquid signal Ca is being input, the motor is driven to rotate at a rotational speed at which liquid is fed at a predetermined small flow rate smaller than the flow rate for normal liquid supply. 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. In a liquid supply device comprising: a display, and a nozzle switch that generates and extinguishes an operation signal B according to the start and end of a liquid supply operation by the liquid supply nozzle, the input of the operation signal B from the nozzle switch; A first circuit that generates a small flow rate liquid supply signal Ca during the time normally required to move the liquid supply nozzle from the liquid supply standby position and insert it into the liquid supply port.
and a timer circuit, which is timed by the input of the operation signal B from the nozzle switch, and when the timer circuit is shorter than the timed operation time of the first timer circuit and the built-in valve of the liquid supply nozzle is closed. a second timer circuit that generates an actuation signal Cb when the time normally required for the liquid supply hose to reach its expansion limit due to liquid feeding by driving a pump; and a control circuit that controls rotation of the motor. , the number of flow rate pulses corresponding to the flow rate flowing through the liquid supply channel until the liquid supply hose reaches its expansion limit due to the liquid supply driven by the pump when the built-in valve of the liquid supply nozzle is closed; a setting circuit for setting a predetermined number of pulses at least one more than the first timer circuit;
Determination to output the stop signal E of the motor when pulses equal to or greater than the set pulse number of the setting circuit are input from the flow rate pulse generator after the activation signal Cb from the second timer circuit is generated during output of Ca. The control circuit is configured to drive the motor at a rotational speed at which liquid is fed at a predetermined small flow rate smaller than the flow rate for normal liquid supply while the small flow rate liquid supply signal Ca is being input. A liquid supply device characterized in that it is configured as follows. 3 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 B in accordance with the start and end of an operation, the liquid supply nozzle is placed on standby for liquid supply by performing a timing operation upon input of the operation signal B from the nozzle switch. a timer circuit that generates a valve opening signal H for the large flow valve when the time normally required to move the valve from its position and insert it into the supply port; a drive circuit for the motor; and a built-in valve for the liquid supply nozzle. is closed, and the number of flow pulses is at least one more than the number of flow pulses corresponding to the amount of liquid flowing through the liquid supply channel until the liquid supply hose reaches its expansion limit due to liquid supply by driving the pump. a setting circuit for setting a predetermined number of pulses; a small flow valve control circuit for opening the small flow valve in response to an input operation signal B from the nozzle switch; a large flow valve control circuit that opens the flow valve; and a high flow rate valve control circuit that opens the flow rate valve; A liquid supply device comprising: a determination circuit that applies a valve closing signal E to the large flow rate valve control circuit and the small flow rate valve control circuit when a pulse number equal to or greater than a set number of pulses is input. 4 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 B according to the start and end of an operation, the liquid supply nozzle is placed on standby for liquid supply by performing a timing operation in response to input of an operation signal from the nozzle switch. a first timer circuit that generates a valve opening signal H for the large flow valve when the time normally required for the operation of moving the valve from its position and inserting it into the supplied liquid port; and an input of the operation signal B from the nozzle switch. When the timing operation is shorter than the timing operation time of the first timer circuit and the built-in valve of the liquid supply nozzle is closed, the liquid supply hose is expanded to its expansion limit by liquid feeding by driving the pump. a second timer circuit that generates an actuation signal Cb when the time normally required to reach the above-mentioned amount of water has elapsed; a drive circuit for the motor; a setting circuit that sets a predetermined number of pulses that is at least one more than the number of flow rate pulses corresponding to the amount of liquid flowing through the liquid feeding channel until the liquid supply hose reaches its expansion limit due to liquid feeding; a small flow valve control circuit that opens the small flow valve in response to input of an operation signal B from the nozzle switch; and a large flow valve control circuit that opens the large flow valve in response to a valve opening signal H from the first timer circuit. a valve opening signal H from the first timer circuit after inputting the actuation signal Cb from the second timer circuit;
a determination circuit that provides a valve closing signal E to the large flow valve control circuit and the small flow valve control circuit when pulses equal to or greater than a set pulse number of the setting circuit are inputted from the flow rate pulse transmitter up to the input point in time; A liquid supply device comprising: