JPH0825597B2 - Oil leak detection method for refueling equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an oil leak detection method for an oil supply device installed in an oil supply station for supplying gasoline or the like to an automobile or the like.

[Conventional technology]

There are two types of refueling equipment, one is fixed above the ground and the other is suspended. Among them, the suspended refueling equipment has a refueling pipe 1 communicating with an underground tank (not shown) as shown in FIG. It is connected to a refueling hose 7 wound around a take-up reel 6 in a case 5 of a hose processing device suspended from the canopy 4 along a wall 3 of the building 2 and the like. A reel motor 8 is connected to the take-up reel 6, and a nozzle position detector 10 for detecting the position of a refueling nozzle 9 provided at the tip of the refueling hose 7 is connected to the take-up reel 6.

Then, as the stop position of the fueling nozzle 9, the highest ceiling position A, the intermediate position B therebelow, and the lowest fueling position C are provided.
3 positions are provided, and the refueling nozzle 9 is located at the highest ceiling position A closest to the canopy 4 so that the refueling nozzle 9 does not get in the way when the store is closed or when a large truck is traveling. The refueling nozzle 9 is positioned at an intermediate position B at a height where it stands by for refueling and does not hinder the vehicle or people, and at the lowest refueling position C when refueling the vehicle.

In the figure, 11 is a pump motor for driving a pump 22 provided in the middle of the oil supply pipe 1, 12 is a flow meter having a flow rate pulse transmitter 21, and 13 is an indicator provided on the wall surface of the building 2 or the like.

In this way, in order to refuel the vehicle, the refueling nozzle 9 is lowered from the intermediate position B to the refueling position C. By this lowering, the pump motor 11 is turned on and the nozzle valve of the refueling nozzle 9 is opened. I am ready to start refueling immediately.

By the way, in the suspension type oil supply device having such a configuration, since the oil supply pipe 1 is arranged long along the building 2 and the canopy 4 as described above, it is difficult to see if a leak occurs at this pipe portion, and as a result, However, there is a possibility that a leak may be found late and a fire or other danger may occur.

In order to prevent the occurrence of such a danger, conventionally, to detect oil leakage, for example, as described in Japanese Utility Model Laid-Open No. 62-87097, the oil supply nozzle 9 is moved from the intermediate position B to the oil supply position C to perform oil supply. The pump motor 11 is driven while descending to, and if the flow rate is measured by the flow meter 12 during this time, it is determined that the oil is leaking in the middle of the piping, and the leaking oil is detected in this way.

[Problems to be solved by the invention]

However, such a means can detect the presence or absence of oil leakage for each refueling, but since the height is such that the refueling nozzle 9 can be reached between the intermediate position B and the refueling position C, the refueling nozzle can be detected. The lever of the nozzle may be accidentally pulled to open the valve during the lowering of 9. In this case, although oil leakage has not actually occurred, it is determined that oil leakage has occurred, so the oil supply device Becomes unavailable. If it is judged that the oil has leaked and cannot be used again, it cannot be used again until repairs and other sufficient restoration procedures have been performed to ensure safety, and the unusable state is easily Since it is configured not to be released, the work of returning to the usable state is very troublesome,
The unusable state may continue for a long time, causing business problems.

The object of the present invention is to eliminate the inconvenience of the conventional example, prevent the accidental pulling of the lever of the refueling nozzle from being determined to be oil leak during detection of oil leak, and accurately detect oil leak.
An object of the present invention is to provide a method for detecting an oil leak in a refueling device, which does not cause any trouble in business.

[Means for solving problems]

According to the present invention, in order to achieve the above object, an oil supply hose is wound around a take-up reel disposed in a case of a hose processing device suspended from a ceiling so that the oil supply hose can be freely extended from the case, and an oil supply nozzle is provided at a tip of the oil supply hose. , A flow meter having a flow pulse transmitter in the middle of the oil supply pipe connected to the oil supply hose, and a pump, and the stop position of the oil supply nozzle at the tip of the oil supply hose to be suspended is set to three stages of ceiling, middle, and upper and lower oil supply In the oil leak detection method of the device, the switch for lowering the oil supply nozzle from the ceiling position to the intermediate position is turned on, the reel motor and the pump motor for rotating the take-up reel are rotated, and the oil supply nozzle is lowered from the ceiling position to the intermediate position. After the pump motor starts rotating for a certain period of time, the flow of oil in the oil supply pipe is detected by the flow rate pulse transmitter after a certain time has elapsed, and if the number of pulses reaches the set value, an oil leak occurs. It is determined that, the inability to control the fuel supply device, the pump motor is stopped, it is an summarized in that the refueling nozzle to stop the reel motor was reached the intermediate position.

[Action]

According to the present invention, the pump motor is turned on while the refueling nozzle is descending from the ceiling position to the intermediate position, and oil leakage is detected during this time. There is no risk of opening the nozzle valve, and it is possible to prevent it from being judged as oil leak by mistake.

Further, during this time, after the rotation of the pump motor is started, the pump pressure causes the positive pressure in the oil supply hose and the oil supply pipe, but the oil flow during this time is not judged to be oil leak, so erroneous detection can be prevented.

Further, when it is determined that the oil has leaked, the control of the oil supply device is immediately disabled, which is safe.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram of an oil supply device in which the oil leakage detection method for an oil supply device of the present invention is implemented. Since the basic configuration of the suspension type oil supply device shown here is as already described, detailed description thereof will be given here. The description is omitted.

Also in the suspension type oil supply apparatus in which the method of the present invention is implemented, the oil supply nozzle 9 is set to stop at three positions of the ceiling position A, the intermediate position B, and the oil supply position C, and the ceiling position A and the intermediate position B are set. Switch to move refueling nozzle 9 between
SW ₁ is provided near the wall of the building 2, and a switch SW ₂ for moving the refueling nozzle 9 between the intermediate position B and the refueling position C is provided near the refueling nozzle 9.

Reference numeral 14 in the figure denotes an alarm by sound or light when an oil leak is detected, and is provided in a conspicuous place such as the case of the display 13.

Further, reference numeral 15 in the figure is a control device using a computer installed in the building 2 or the like, and as shown in the block diagram of FIG. (CPU) 17, storage device (RAM) 18, storage device (RO
M) 19 and clock circuit 20. The control device 15 outputs the output signals from the switches SW ₁ and SW ₂ , the detection signal from the nozzle position detector 10, and the flow rate pulse transmitter.
The pulse signal from 21 was introduced, and the control signal from the control device 15 was introduced into the alarm 14, the display 13, the reel motor 8 and the pump motor 11, respectively.

The operation of oil leakage detection will be described next with reference to the flowchart of FIG. 3. When the gas station is closed, such as at night, or when a large truck is loaded or unloaded, the fuel nozzle 9 is located at the ceiling position A, which is the highest position closest to the canopy 4. .

When the switch SW ₁ is pressed to lower the refueling nozzle 9 at the ceiling position A to the intermediate position B (step a), the nozzle position detector 10 detects that the current position of the refueling nozzle 9 is the ceiling position A. (Step B), based on the detection signal from this, the controller 15 causes the reel motor 8 to rotate in the normal direction and the pump motor 11 to rotate at the same time (Step C).

As a result, the take-up reel 6 rotates forward, the refueling hose 7 is fed out from the case 5 of the hose processing device, and the refueling nozzle 9 starts to descend.

By the way, the oil in the refueling hose 7 or the refueling pipe 1 may be cooled and contracted at night before opening the store, and the refueling hose 7 or the refueling pipe 1 may have a negative pressure. During time T ₁ (for example, about 1 second) (step 1), the pressure inside the fuel supply hose 7 and the fuel supply pipe becomes positive due to the pump pressure. Therefore, even if the oil flow is detected during this time T ₁ , it is not judged as an oil leak.

If there is an oil flow in the oil supply pipe 1 even after the lapse of time T ₁ (1 second) and a pulse signal is issued from the flow rate pulse transmitter 21 (step E), this pulse signal enters the control device 15 and the number of pulses. n is measured (to step).

When the pulse number n becomes N (N = 3) (step),
When it is judged that oil has leaked, the control device 15 outputs it to the alarm 14 to notify that the oil has leaked by light or sound, and at the same time, the oil supply device is made uncontrollable and the function is stopped (step H).

Then, when the pump motor 11 stops (stepping) and the nozzle position detector 10 detects that the refueling nozzle 9 has descended to the intermediate position B (stepnu), the reel motor 8 also stops (stepling). Search for oil leaks and perform repair work.

By the way, the refueling nozzle 9 starts descending from the ceiling position A, and the pump motor 11 starts rotating (step C),
The number n of pulses measured after the lapse of time T ₁ (1 second) (step ₂ ) is N (N = N) during the time T ₂ (for example, 3 seconds) thereafter.
3) If it is less than or equal to (step e, f, t, w) or zero (step h, w), it is determined that there is no leak in this case, and the pump motor 11 is stopped (step).

In this way, when the gas station is opened or a large truck is refueled, the refueling nozzle 9 is moved from the ceiling position A to the intermediate position B to prepare for refueling. Find out.

This movement is at a high place beyond the reach of a person, and therefore, there is no risk of accidentally touching the refueling nozzle 9 during this time to open the nozzle valve, so there is no possibility of being judged as an oil leak due to a malfunction. .

Next, in order to raise the refueling nozzle 9 positioned at the refueling standby position, which is the intermediate position B, to the ceiling position A at the time of closing the store or for loading and unloading of a large truck, switch SW ₁ is used. If pushed (step toy), nozzle position detector 10
It is detected that the current position of the fueling nozzle 9 is not the ceiling position A (step B), and the control device 15 outputs it to the reel motor 8 based on the detection signal from the position A (step W).

As a result, the take-up reel 6 reversely rotates, the refueling hose 7 is wound around this, and the refueling nozzle 9 rises. When the refueling nozzle 9 moves to the ceiling position A and is detected (step), the reel motor 8 stops (step YO), and the refueling nozzle 9 stops at the ceiling position A.

Therefore, the refueling nozzle 9 is located at a high place,
Since it is out of reach, it is not tampered with when the store is closed, such as at night, and the refueling nozzle 9 does not hinder the running of the large truck when the truck is in and out.

Next, the operation of moving the refueling nozzle 9 stopped at the intermediate position B to the refueling position C for refueling will be described with reference to the flowchart of FIG.
When the hand-held switch SW ₂ provided in the vicinity is pressed (step), the nozzle position detector 10 detects that the refueling nozzle 9 is currently stopped at the intermediate position B (step),
As a result, the reel motor 8 is normally rotated by the output from the controller 15 (stepwise), the refueling hose 7 is further fed from the take-up reel 6, and the refueling nozzle 9 is lowered.

Then, when it is detected that the refueling nozzle 9 has descended to the refueling position C (steps), the rotation of the reel motor 8 is stopped and the refueling nozzle 9 is stopped at the refueling position C, and at the same time the display 13 is displayed. The previous refueling amount is reset, and the pump motor 11 rotates to enter the refuelable state (step S). Therefore, it is possible to refuel by inserting the refueling nozzle 9 into the refueling port of the automobile and opening the nozzle valve.

Next, the operation of moving the refueling nozzle 9 from the refueling position C to the intermediate position B upon completion of refueling will be described.
When the hand-held switch SW ₂ provided in the vicinity is pressed again (step step), the nozzle position detector 10 detects that the current stop position of the fueling nozzle 9 is not the intermediate position B (step step). As a result, the pump motor 11 stops, and at the same time, the reel motor 8 starts reverse rotation (stepner).

As a result, the refueling hose 7 is wound around the take-up reel 6, the refueling nozzle 9 rises, and when it is detected that the refueling nozzle 9 has moved to the intermediate position B (stepla), the reel motor 8 rotates. Stop (step) and refuel nozzle 9
Stops at intermediate position B.

〔The invention's effect〕

As described above, the oil leakage detection method of the oil supply device of the present invention checks for the presence of oil leakage in the middle of the oil supply pipe while the oil supply nozzle descends from the ceiling position, which is out of reach of people, to the intermediate position. Since it is possible to prevent the nozzle valve from being opened by accidentally touching the oil supply nozzle and pulling the lever during this time, oil is not scattered from a high place and a danger such as a fire can be prevented and safety can be secured.

Further, since there is no possibility of oil leakage being judged due to malfunction, the presence / absence of oil leakage can be accurately detected, and the refueling machine cannot be out of control due to malfunction, and there is no risk of impeding business.

Furthermore, while the refueling nozzle is descending from the ceiling position to the intermediate position, after the rotation of the pump motor starts, the pump pressure causes the refueling hose and refueling pipe to become positive pressure, but the oil flow during this time is not judged to be oil leak. It is possible to prevent false detection.

Moreover, when it is judged that the oil has leaked, the control of the oil supply device is immediately disabled, which is safe.

[Brief description of drawings]

FIG. 1 is an explanatory view of an oil supply device in which an oil leakage detection method for an oil supply device of the present invention is implemented, FIG. 2 is a block diagram of the same as above, FIG.
FIG. 4 is a flow chart showing the operation of the method of the present invention. 1 ... Refueling pipe, 2 ... Building, 3 ... Wall, 4 ... Canopy, 5 ... Hose processing device case, 6 ... Take-up reel, 7 ... Refueling hose, 8 ... Reel motor, 9 ... Refueling nozzle , 10 …… Nozzle position detector 11 …… Pump motor, 12 …… Flowmeter 13 …… Display, 14 …… Informer 15 …… Control device, 16 …… Input / output device (I / O) 17 …… Central processing unit (CPU), 18 ... Storage device (RAM) 19 ... Storage device (ROM), 20 ... Clock circuit 21 ... Flow rate pulse transmitter, 22 ... Pump A ... Ceiling position, B ... Intermediate position C ... Refueling position

Claims (1)

[Claims] 1. A refueling hose is wound around a take-up reel disposed in a case of a hose processing device suspended from a ceiling so that the refueling hose can be drawn out from the case, and a refueling nozzle is provided at the tip of the refueling hose. A flow meter with a flow rate pulse generator and a pump are installed in the middle of the oil supply pipe to be connected, and the oil leakage detection of the oil supply device is performed by setting the stop position of the oil supply nozzle at the tip of the suspended fuel supply hose to three stages: ceiling, middle, and upper and lower levels of oil supply. In the method, a switch for lowering a fueling nozzle from a ceiling position to an intermediate position is turned on, a reel motor and a pump motor for rotating a take-up reel are rotated, and a pump motor during a lowering of the fueling nozzle from the ceiling position to the intermediate position. The flow of oil in the oil supply pipe is detected by the flow rate pulse transmitter after a certain period of time has elapsed after the start of rotation, and if this number of pulses reaches the set value, it is determined that oil leakage has occurred and the oil supply device Leakage oil detection method of fueling apparatus and disabling the control of the pump motor is stopped, characterized by stopping the reel motor at the refueling nozzle has reached the intermediate position.