JPH03320B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field This application describes an automatic stop that automatically stops refueling when a prespecified value, that is, a preset value or a value after the decimal point, reaches a value of all zeros, that is, an integer value. This invention relates to a functional suspended type oil supply device.

(b) Conventional technology At a gas station with a small site, a pump unit containing a flow meter, pump, etc. is placed in the corner of the site, a hose lifting unit with a hose hanging down is placed above the refueling point, and both units are connected through a fuel pipe. I am using it.

In this case, the oil pipe is installed in a high place such as on the roof, and when refueling is automatically terminated by stopping preset value refueling or integer value refueling, the flow rate of the nozzle connected to the lower end of the hose is Even though the regulating valve remained open and oil supply to the nozzle had been stopped due to reasons such as the head difference between the nozzle and the oil pipe and the fact that gasoline with high vapor pressure was heated by solar heat, etc. Oil in the hose or oil supply pipe may leak out from the nozzle, so a stop valve such as a solenoid valve is installed at or near the hose lifting unit and this valve is closed at the same time as refueling is completed to prevent oil from flowing out. In addition, a model equipped with a valve that opens only when the hose length is within a predetermined range is
No. 34598, but this is to prevent disasters in the event of an accident where a car pulls a hose, and its purpose is different from the patent of the present application.

(c) Problems to be solved by the invention In general, these shutoff valves use electricity as driving force, so they have an explosion-proof structure for safety reasons.
The coil case and wire junction box are bulky, making it difficult to store them, and they are also expensive, and the electrical work up to the shut-off valve, which is carried out separately, also needs to be expensive and explosion-proof.

(d) Structure and operation for solving the problems The present invention includes a pump unit, a drum connected to the pump unit and around which a hose with a nozzle connected to the tip is wound, and a hose driven by the rotation of the drum when refueling. A valve mechanism that opens when the drum is at the unwinding length and closes when the drum rotates in the unwinding direction is provided in the oil supply pipe, and further includes a means for stopping oil transport, an elevation motor for driving the drum, and means for controlling the same. The main component is that when the hose is at the length of the hose being fed out during refueling, the valve mechanism opens to enable refueling, and when the oil feeding is automatically stopped by the automatic stop means, the drum is rotated in the direction of the hose being fed out. The valve mechanism is closed.

(E) Embodiment In FIGS. 1 to 4, 2 is a pump unit, which includes a pump 6 driven by a motor 4, and a flow meter 8.
A flow rate pulse transmitter 10 is housed therein, which outputs one flow rate pulse signal a every time the flow meter 8 measures a unit oil amount (here, 1/100 liter).

Reference numeral 12 denotes a hose lifting unit installed on the ceiling 14. Inside the housing 13 is a drum 22 around which a hose 20 is wound, which is connected to the pump unit 2 through an oil feed pipe 16 and has a fuel nozzle 18 connected to its lower end. The hose 20 is determined by the lifting motor 24 that rotates the drum 22 in forward and reverse directions and the rotation angle of the drum 22.
a hose feed-out length detector 26 that detects the feed-out length of the drum 22 and outputs a feed-out length signal b;
sprocket 27 and sprocket 28 that are integrated with the sprocket 27 and sprocket 28, and a sprocket 30 to which the rotation of the lifting motor 24 is transmitted by the sprocket 28.
A cam 32 fixed to the cam 32 is interposed between the downstream end of the oil feed pipe 16 and an inlet 34 to the drum 22, and its internal flow path 36 closes the valve port 40 by hydraulic pressure and the elasticity of a spring 38. A valve mechanism 46 including a built-in valve 42 biased in the direction and a valve shaft 44 extending from the valve 42 to the outside of the flow path 36 is housed.

48 is a roller provided at the tip of the valve shaft 44; 50 is a trough of the cam 32; while the outer periphery of the cam other than the trough 50 is pushing the valve shaft 44 into the valve mechanism 46 via the roller 48, the valve 42 is Displaced to open the valve port 40. Note that the valve drive mechanism here includes a valve shaft 44, a roller 48, and a cam 32.

52 is a hose 20 installed in the housing 13
A protective roller 54 is a stopper fixed to the hose 20 to prevent the maximum length of the hose 20 from the housing 13 from being longer than necessary, and a protective roller 55 is a stopper fixed to the hose 20 to prevent the hose 20 from becoming longer than necessary. It is a colored piece to cover.

56 is a lift control switch for the hose 20 provided near the nozzle, 58 is a refueling amount display, 60 is a preset keyboard, 62 is a control section housing various electric circuits to be described later, and 64 is a control valve.

In FIG. 5, numeral 66 is a counting circuit which counts the number of pulse signals a, and provides a count value signal c, which is the output of the count value, to the display 58 to display it as the amount of oil supplied, and also to a comparison circuit 68.

70 is a storage circuit that stores the preset value input from the preset keyboard 60 and outputs the stored value as a stored value signal d; 72 is a control signal generation circuit, and the nozzle 18 is placed in the solid line position in FIG. 1 (refueling standby). When the switch 56 is operated and the hose feed signal e (one pulse) is output when the switch 56 is in the 1st position), the pump energizing signal f is outputted and applied to the pump motor drive circuit 74 to energize the pump motor 4 to rotate and raise/lower. Motor forward rotation signal g
(one pulse) is applied to the lifting motor drive circuit 76 to urge the lifting motor 24 to rotate forward. on the other hand,
When the nozzle 18 is at the lower limit position (refueling position) indicated by the two-dot chain line in FIG. 1, the hose storage signal h
(one pulse) is output, the pump energization signal f
disappears and the lifting motor reversal signal i
(one pulse) to energize the lifting motor 24 until the nozzle 18 rises to the refueling standby position. Further, the control signal generation circuit 72 determines whether or not oil is being supplied (oil is being discharged) by measuring the input interval of the pulse signal a based on the clock signal j output from the clock signal generation circuit 78. However, even if the storage signal h is erroneously inputted during refueling, this is ignored and the nozzle 18 is prevented from rising.

Reference numeral 80 denotes a determination circuit, which performs an operation to automatically stop refueling when the decimal point of the refueling value becomes an integer value (exact value) of all zeros, that is, nozzle 1.
It is determined from the input interval of the pulse signal a based on the clock signal j whether or not an operation for changing the flow velocity in a predetermined pattern using the flow velocity regulating valve (not shown) 8 has been performed, and the previous operation is performed. When this is done, a judgment signal m (one pulse) is output.

82 is a control valve drive circuit that opens and closes the control valve 64.

In the above configuration, when a refueling truck comes to our office, we first ask the customer for the desired amount, and then press the preset keyboard 6.
Input from 0. At this time, if the desired amount is 30 liters, this value is stored in the storage circuit 70, and a stored value signal d indicating 30 liters is output. Thereafter, the operator operates the switch 56 to output the hose delivery signal e. Then, the control signal generation circuit 72 outputs a zero return signal p (one pulse) to return the previous oil supply value of the counting circuit 66 to zero, and also outputs a pump energization signal f to rotationally energize the pump motor 4. A normal rotation signal g is given to the lifting motor drive circuit 76. The drive circuit 76 rotates the lifting motor 24 in the normal direction in response to the input of the normal rotation signal g, thereby allowing the hose 20 to further extend from the length at which it is on standby for refueling.

The length of this hose 20 is extended until the nozzle 1 reaches the refueling position, which is the lower limit position indicated by the two-dot chain line in Figure 1.
8 is lowered, the energization of the elevating motor 24 is stopped based on the feed-out length signal b from the hose feed-out length detector 26 that detects this.

At this point, the cam 32 is
Since the trough 50 and the rollers 48 of the valve shaft 44 do not face each other, the valve 42 remains displaced against the elasticity of the spring 38, and the valve port 40 remains open. Further, at this time, the stopper 54 has not come into contact with the roller 52, and the colored piece 55 is located inside the housing 13.
This colored piece 55 cannot be visually recognized from outside.

In this state, the refueling work progresses, and the value of the count value signal c, that is, the count value of the counting circuit 66, becomes the stored value signal d.
When the comparator circuit 68 outputs a stop signal n, the comparison circuit 68 outputs a stop signal n. Outputs the pump motor drive circuit 7
Give to 4. Then, the drive circuit 74 de-energizes the pump motor 4 despite the presence of the pump energizing signal f, thereby ending the preset oil supply for 30 liters.

Note that at this time, the stop signal n is also given to the lifting motor drive circuit 76. When the signal n is input, the drive circuit 76 urges the lifting motor 24 to rotate in the normal direction, thereby rotating the drum 22 in a direction to further extend the hose 20. Then, the cam 32 is rotated clockwise from the state shown in FIG. 3, and the roller 48 fits into the valley 50, causing the valve 42 to close the valve port 40 due to the elasticity of the spring 38, as shown in FIG. The elevating motor is deenergized at the closing position, but at this time, the length of the hose 20 drawn out from the housing 13 is slightly reduced (the length of the hose 20 is changed from the refueling length to the stopper 54 hitting the roller 52). Although the distance from the housing 13 is only longer, in order to transition from the refueling state shown in FIG. 3 to the state shown in FIG. 4, where the valve port 40 is closed by the valve 42, it is necessary to Since the hose 20 is paid out more than the length of the hose 20, when the valve port 40 is closed, the hose 20 floats up from the drum 22 and is in a slack state as shown by the two-dot chain line in FIG.

In this state, a colored piece 55 different from the color of the hose 20 appears outward from the housing 13, so the operator can see the colored piece 55 even from a distance, and the refueling is automatically stopped. You can know things.

Thereafter, the operator closes the flow rate regulating valve of the nozzle 18 and operates the switch 56 to output the storage signal h. The control signal generating circuit 72 eliminates the pump energizing signal f by inputting the signal h, outputs a return to zero signal r (one pulse) to return the stored value of the memory circuit to zero, and further outputs a reversal signal i (one pulse). ) is applied to the lift motor drive circuit 76 to reversely energize the lift motor 24 and rotate the drum 22 to accommodate the hose 20 until the nozzle 18 rises to the refueling standby position. At this time, the valve port 40 is opened by the action of the cam 32, but since the flow rate regulating valve of the nozzle 18 is already closed, there is no risk of oil flowing out from the nozzle 18.

The above is a case where preset value refueling stop is executed, but when the nozzle operation (changing the flow velocity in a predetermined pattern) is performed during refueling to perform integer value refueling stop, the judgment circuit 80 outputs The comparator circuit 68 monitors the value of the signal c, that is, the oil supply value, based on the judgment signal m, and after the signal m is input, when all values below the decimal point become zero (exact value without fractions) or the signal When the value of c comes before the next integer value by the inertial discharge amount of the pump 6, a stop signal n is output to de-energize the pump motor 4, and the lifting motor 24 is activated in the same way as when stopping preset oil supply. The hose 20 is urged to rotate in the direction in which it is fed out until the valve port 40 is closed by the valve 42.

Note that an automatic stop such as a preset lubrication value stop or an integer value lubrication stop is not performed by deenergizing the pump motor 4, and the control valve 6 inserted in the oil feed pipe 16 in or near the pump unit 2
4, the stop signal s is sent to the control valve drive circuit 82 instead of the stop signal n.
is applied to the control valve 64 to close the control valve 64, and this signal s is also applied to the elevating motor drive circuit 76 to operate the elevating motor 2 in the same way as when the signal n is input.
All you have to do is drive 4. In addition, at this time, the above-mentioned "inertial discharge amount of the pump 4" will be read as "the discharge amount due to the closing delay of the control valve 64."

In the above configuration, as a method of opening and closing the valve 42 of the valve mechanism 46, it is also possible to adopt a link method in addition to the cam method in the embodiment of the present application, and the stopper 54 of the hose 20 may be fixed to the hose itself or the housing 13 side. A hose clamping portion is provided to clamp the hose 20 and prevent it from being drawn out further from the housing 13, and this is connected to the lifting motor 24.
It is also possible to operate in conjunction with the length of the hose fed out using the power of the hose 20, or if the length of the hose 20 drawn out from the housing 13 greatly exceeds the length at the time of refueling, no inconvenience will occur. In this case, the stopper itself for the hose 20 may not be provided.

(f) Effects As detailed above, when refueling is automatically stopped, the lifting motor is energized in the direction in which the hose is further fed out, closing the flow path between the oil feed pipe and the hose, so that the flow to the nozzle is Accidents in which oil leaks from hoses and oil pipes due to the nozzle flow rate adjustment valve remaining open even when the oil supply has been cut off can be avoided by installing bulky and expensive explosion-proof electrical equipment. This can be prevented without using the flow path, and since the length of the hose leading out from the housing is not shortened when this flow path is closed, there is a risk that the nozzle inserted into the fuel filler port will be pulled out without permission. Therefore, an inexpensive and safe refueling device without any problems can be obtained.

[Brief explanation of the drawing]

Figure 1 shows the arrangement of each refueling-related unit at a gas station, Figure 2 shows the structure of the hose lifting unit, Figures 3 and 4 show the different operating states of the valve mechanism in cross section, and Figure 5 The control section is shown in a block diagram. 2... Pump unit, 12... Hose lifting unit, 20... Hose, 22... Drum, 32
...Cam, 42...Valve, 46...Valve mechanism, 54...
...Stopper, 55...Colored piece.

Claims (1)

[Claims] 1 A pump unit equipped with an oil feed pump and a flow meter, an oil feed pipe extending from the pump unit, a housing installed above the oil supply position, and a nozzle installed inside the housing to which the oil feed pipe is connected. A drum with a hose wound around it, a lifting motor that rotates the drum in the forward direction to feed out the hose, and a lifting motor that rotates the drum in the reverse direction to wind it up, and detects the length of the hose being fed out from the drum based on the rotation of the drum. A hose payout length detector outputs a hose length signal when refueling, and a hose feed length detector that is connected to the oil feed pipe closest to the drum and is opened and closed by the action of a cam that is linked to the rotation of the drum and is opened when the hose is at the feedout length during refueling. Further, a valve mechanism includes a built-in valve that closes when the drum is rotated in the normal direction, an oil feed control means that automatically stops oil feed to the nozzle when a stop signal is generated, and the built-in valve closes when a stop signal is generated. 1. A refueling device comprising: an elevating motor control means for rotating the drum in the normal direction until the detector detects a position where the drum is rotated.