JPH03319B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This application provides a function that automatically stops refueling when a pre-specified value, ie, a preset value, or a value after the decimal point reaches a value of all zeros, ie, an integer value. This relates to a hanging type oil supply device.

(b) Conventional technology At a gas station with a small site, a pump unit containing a flow meter, a 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 by 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 nozzle valve connected to the lower end of the hose Despite the fact that the oil supply to the nozzle has been stopped due to reasons such as the drop between the nozzle and the oil pipe and the fact that gasoline with high vapor pressure is heated by sunlight, 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 reel 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 length of the hose being fed out is within a specified range is seen in Japanese Patent Publication No. 59-34598, but this was designed to prevent disasters in the event of an accident where a car pulls the hose. However, the purpose of this patent is different from that of the patent in question.

(c) Problems to be solved by the invention In general, shutoff valves use electricity as driving force, so they have an explosion-proof structure for safety reasons, and the coil case and wire connection box are bulky and difficult to store. This was problematic and expensive, and the electrical work up to this shutoff valve had to be expensive and explosion-proof.

(d) Structure and operation for solving the problem The present invention includes a pump unit, a hose connected to the pump whose length from the housing is limited to the maximum length, and a drum around which the hose is wound. and a valve mechanism that opens when the drum is driven in a direction in which the hose is further fed out after reaching its maximum length, and an oil feeding control means that automatically stops oil feeding.
The main components are a lifting motor for driving the drum and a means to control it, and after the hose has been paid out to its maximum length, the drum is further driven in the feeding direction and the valve mechanism opens, allowing refueling and presetting. When automatic lubrication is stopped by value lubrication, integer value lubrication, etc., the hose is wound up by the drum within a range where the length of the hose extending from the housing does not change, and 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 supply pipe 16 and has a fuel nozzle 18 connected to its lower end. , the hose 20 from the rotation angle of the drum 22 and the lifting motor 24 that rotates the drum 22 in the forward and reverse directions.
a hose feed-out length detector 26 that detects the feed-out length of the hose and outputs a feed-out length signal b; a sprocket 27 and a sprocket 28 that are integrated with the drum 22; and the rotation of the lifting motor 24 is transmitted by the sprocket 28. The internal flow path 36 is interposed between the cam 32 fixed to the sprocket 30 and the downstream end of the oil pipe 16 and the inlet 34 to the drum 22, and the internal flow path 36 is opened to the valve port 40 by the hydraulic pressure and the elasticity of the spring 38. Built-in valve 4 biased in the direction of closing
2 and a valve mechanism 46 having 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 mountain portion of the cam 32; while this mountain portion 50 pushes the valve shaft 44 into the valve mechanism 46 via the roller 48, the valve 4
2 is displaced to open the valve port 40.

52 is a hose 20 installed in the housing 13
The protective roller 54 is a stopper fixed to the hose 20 and regulates the maximum length of the hose 20 from the housing 13 within the length specified by the Fire Service Act.

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, a counting circuit 66 counts the number of pulse signals a, and outputs the counted value signal c to the display 58 to display it as the amount of oil supplied, and also to a comparing circuit 68.

72 is a control signal generation circuit in which the nozzle 18 is connected to the first
When the switch 56 is operated at the solid line position (refueling standby position) in the figure and the hose feed signal e (one pulse) is output, the pump energizing signal f is output and applied to the pump motor drive circuit 74 to activate the pump motor 4. At the same time, a normal rotation signal g (one pulse) of the lifting motor is applied to the lifting motor drive circuit 76 to urge the lifting motor 24 to rotate normally. 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. i (one pulse) is output and the lifting motor 24
is energized until the nozzle 18 rises to the previous refueling standby position. Furthermore, 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 has been performed using the valve No. 8, and if the previous operation has been performed, 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 feed 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.

When the hose 20 is fed out and the length of the hose 20 reaches the maximum length, the stopper 54 comes into contact with the roller 52 as shown in FIG. However, at this point, the crest 50 of the cam 32 has not pushed the valve shaft 44 into the valve mechanism 46, and therefore the valve 42 is in a state where the valve port 40 is closed.

When the hose 20 is prevented from being drawn out by the stopper 54, the rear drum 22 is further rotated in the direction in which the hose 20 is fed out, and the hose 20 is fed out until it is in a slack state as shown by the two-dot chain line in FIG. , the peak 50 of the cam 32 pushes up the valve shaft 44, and as shown in FIG. is deactivated.

When the valve of the nozzle 18 is opened in this state, refueling will begin.

As the refueling work progresses, the value of the count value signal c, that is, the count value of the counting circuit 66, becomes the same as the value of the stored value signal d.
When the comparator circuit 68 outputs a stop signal n when it matches exactly 30 liters or the value obtained by subtracting the discharge amount due to the inertia of the pump (the amount discharged from the de-energization of the pump motor until the pump stops) from this 30 liters, the comparison circuit 68 outputs a stop signal n. It is applied to the pump motor drive circuit 74.
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 signal n is also given to the lifting motor drive circuit 76. This drive circuit 76 has a signal n
When inputted, the lifting motor 24 is reversely energized to rotate the drum 22 in the direction in which the hose 20 is stored. Then, the cam 32 is rotated clockwise from the state shown in FIG. 3, the ridge 50 comes off the roller 48, and the valve 42 is moved from the valve opening 40 by the elasticity of the spring 38 as shown in FIG. At the closing position, the elevating motor is deenergized, but at this time, the length of the hose 20 extending from the housing 13 does not change, that is, the stopper 54 remains in contact with the roller 52, and the external appearance is maintained. It is not recognized that the lifting motor 24 was energized and the drum 22 was rotated in the direction to accommodate the hose 20. The closed position of the valve 42 is determined based on the feed length signal b from the hose length detector 26.

Thereafter, the operator closes the 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 lifting motor drive circuit to turn the lifting motor 2.
4 is reversely energized and the nozzle 18 is raised to the refueling standby position.
Rotate.

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 Based on the determination signal m, the comparison circuit 68 monitors the value of the count value signal c, that is, the amount of oil supplied, and outputs the signal m.
is input, when all values after the decimal point become zero (exact value without fractions), or when the value of signal c reaches the point before the next integer value by the inertial discharge amount of pump 4. Then, the pump motor 4 is deenergized by outputting a stop signal n, and the valve 42 closes the valve port 40 in the same manner as when the preset oil supply is stopped, but the lifting motor is turned on within the range where the length of the hose 20 led out from the housing 13 is maintained. 24 is reversely biased.

Note that stopping the preset oil supply value or stopping the integer value oil supply is not performed by deenergizing the pump motor 4, but is performed by closing the control valve 64 inserted into the oil feed pipe 16 in or near the pump unit 2. In this case, a stop signal s is given to the control valve drive circuit 82 instead of the stop signal n to drive the control valve 6.
4, and this signal s is also applied to the lifting motor drive circuit 76 to drive the lifting motor 24 in the same way as when the signal n is input. 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 being fed out using the power of
It is also possible to open the hose 20 and apply pump pressure to the inside of the hose 20 to expand the hose 20 with hydraulic pressure prior to the start of refueling.

(f) Effects As detailed above, when oil supply is automatically stopped, the flow path between the oil pipe and the hose is closed while maintaining the length of the hose leading out from the housing, which reduces the supply of oil to the nozzle. It is possible to prevent an accident in which the oil in the hose or oil pipe is leaked even though the flow path has been cut off without using bulky and expensive explosion-proof electrical equipment. Since the length of the hose from which the hose is led out does not change (does not become shorter), it is possible to obtain an inexpensive and safe refueling device in which there is no fear that the nozzle inserted into the refueling port will be pulled out without permission.

[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 cross sections of the valve mechanism in different operating states, and Figure 5 shows the control system. This is a block diagram showing the parts. 2... Pump unit, 12... Hose lifting unit, 20... Hose, 22... Drum, 32
...Cam, 42...Valve, 46...Valve mechanism, 54...
…stopper.

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 feed-out length detector for outputting a hose length signal; a means for limiting the length of the hose from the housing to a maximum length; The valve mechanism has a built-in valve that is opened and closed by the action of an interlocking cam and is opened when the hose reaches its maximum discharge length and the drum is rotated in the normal direction, and a valve mechanism that automatically stops oil supply to the nozzle when a stop signal is generated. oil control means;
Refueling characterized by comprising a lifting motor control means for reversing the drum within a range where the maximum lead-out length of the hose is maintained upon generation of a stop signal and until the detector detects the closed position of the built-in valve. Device.