JPH0615918Y2 - Oil supply system with pipe leakage detection function - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an oil supply system installed at a gas filling station, and in particular, it is suitable for use when detecting oil leaks in pipes. It is about the system.

[Prior Art and Problem] Conventionally, in a gas station where a fixed weighing machine is installed, a pipe for supplying oil in a storage tank to each weighing machine is buried in the ground. By the way, if the oil leaks from the pipe to the ground due to cracks in the pipe wall due to deterioration of the pipe, it is very dangerous to let the oil leak. Therefore, for example, two conductors are wired in the pipe, the pipe wall is formed of an oil-soluble substance, and an oil leak detection line is buried along the periphery of the oil storage tank and along the outside of the pipe, and the terminal of the detection line is , Connect to the terminal of the oil leak detector installed in the gas station building. When oil leaks into the ground from the pipe and reaches the detection line, the oil-soluble substance is dissolved and enters the pipe, and the oil-soluble substance inside is melted, so that the two conductors come into contact with each other and are electrically connected. As a result of being connected to, there was a method of notifying the leak of oils by shaking the pointer of the detector.

By the way, in recent years, due to the amendment of the Fire Service Law, it has become possible to add convenience stores, restaurants, etc. on the premises of gas stations, so an unspecified number of customers go in and out of the premises of gas stations with such stores. Like However,
In the conventional oil leak detection method as described above, the conductor wire is arranged in the pipe through which the oil flows, so that it is very dangerous and has a problem in safety.

The present invention solves the above problems, and an object of the present invention is to provide an oil supply system with a pipe leakage detection function that accurately detects oil leaks in pipes and improves safety.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an oil supply pump for pumping oil, an oil supply hose having a proximal end communicating with the oil delivery side of the oil supply pump, and an oil supply hose of the oil supply hose. A weighing machine having an oil supply nozzle connected to the tip, an oil storage tank for storing oil, one end communicated with the oil pumping side of the oil supply pump of the weighing machine, and the other end communicated with the oil storage tank. And a pipe for supplying oil to the oil pumping side of the oil pump of the weighing machine, and the oil storage tank and the weighing machine. In the double pipe structure consisting of a detection pipe that allows air to flow between them, in the weighing machine, suction means for sucking air in the detection pipe from one end side of the pipe, and in the air sucked by the suction means Check for oil vapor In addition to providing a detecting means for knowing, the detecting means is connected to a control means for notifying that oil has leaked in the oil feeding pipe based on a detection signal accompanying detection of the presence or absence of oil vapor. It is characterized by

[Operation] According to the present invention, when oil leaks from the oil supply pipe, the leaked oil vapor is mixed into the air in the detection pipe, so the air mixed with the oil vapor is sucked from the detection pipe. When the means sucks, the detection means detects the oil vapor in the air sucked by the suction means. Then, based on the detection signal from the detection means, the control means connected to the detection means informs of the oil leakage in the oil supply pipe.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is a gas station building, 2-1 and 2-2 are weighing machines installed on islands within the gas station's premises to refuel vehicles, and 3 is buried underground in the gas station's premises. An oil storage tank 4 for storing oils stored therein is embedded in the ground to supply oils from the oil storage tank 3 to the respective weighing machines 2-1 and 2-2 and a detection pipe 4B for circulating air. It is a double pipe having.

In the gas station building 1, 5 is a control device, which controls each part of the weighing machines 2-1 and 2-2. The control device 5 includes
A gas monitoring switch for setting a gas monitoring mode when detecting an oil leak in the oil supply pipe 4A, a timer for measuring gas monitoring time, and a gas monitoring switch arranged for each weighing machine 2-1 and 2-2 for gas monitoring, which will be described later. A scan order counter (not shown) for counting the scan order when sequentially scanning the detection signal of the gas detection sensor is provided. 6 is an oil leakage indicator,
It is displayed from which detection area of the oil supply pipe 4A, which will be described later, the oil is leaking. Reference numeral 7 denotes an oil leakage alarm device, which notifies that oil leakage has occurred from the oil supply pipe 4A.

In this case, when the scan order counter is "1", the presence or absence of oil leakage in a first detection area, which will be described later, corresponding to the weighing machine 2-1 in the oil feed pipe 4A is detected, and when "2", The presence or absence of oil leakage in a second detection area, which will be described later, corresponding to the weighing machine 2-2 in the oil supply pipe 4A is detected. In addition, after a lapse of a predetermined time from the time when the gas monitoring switch is pressed, the suction means is driven by the pump driving motor described later during the gas monitoring time to suck air from the detection pipe 4B.

In the weighing machine 2-1, 8 is an oil supply pump, which is driven by a pump driving motor 9 and pumps oils from the oil supply pipe 4A. A refueling permission signal / refueling prohibition signal is supplied from the control device 5 to the pump driving motor 9. Reference numeral 10 is a flow rate pulse transmitter attached to the flow meter 11, and outputs a pulse corresponding to the oil supply flow rate. Reference numeral 12 denotes an oil supply hose connected to the flow meter 11, and an oil supply nozzle 13 is arranged at the tip of the hose. Reference numeral 14 denotes a nozzle switch disposed on the back side of the nozzle hook 15, and when the oil supply nozzle 13 is removed from the nozzle hook 15, the nozzle switch 14 is turned on, and when returned to the nozzle hook 15, it is turned off. Reference numeral 16 denotes a refueling amount display, which displays a refueling amount to the vehicle.

Reference numeral 17 is a relief pipe provided in parallel with the pipe 8A of the oil supply pump 8 and provided with a relief valve (not shown). When the discharge side pressure of the oil supply pump 8 exceeds a predetermined value, the relief valve is opened. Then, the oil discharged from the oil supply pump 8 is relieved. The relief valve is closed when the discharge side pressure is equal to or lower than a predetermined value. Reference numeral 18 denotes an air separator arranged in the middle of the relief pipe 17, which separates and takes out the air in the oil supply pipe 4A when the oil supply pump 8 pumps up oils from the oil supply pipe 4A. Reference numeral 19 denotes an air escape pipe, which is used to release the air separated and taken out by the air separator 18 to the air discharge port 20.
From the weighing machine 2-1 to the outside.

Reference numeral 21 denotes a suction means, which forcibly sucks the air flowing through the detection pipe 4B and sends the sucked air to the air escape pipe 19 via the check valve 22. Reference numeral 23 denotes a gas detection sensor disposed on the air suction side of the suction means 21, which detects the presence or absence of oil vapor in the air sucked by the suction means 21 and controls a detection signal associated with the detection of oil vapor. Supply to the device 5. That is, when the oil leaks from the oil feed pipe 4A of the double pipe 4, the oil vapor is mixed with the circulating air in the detection pipe 4B, so that the oil vapor in the air sucked by the suction means 21 is gasified. The detection sensor 23 detects it. In the present embodiment, the drive source of the suction means 21 is shared with the pump drive motor 9 for driving the oil supply pump 8.

The weighing machine 2-2 has the same structure as the weighing machine 2-1. The same parts as those of the weighing machine 2-1 are designated by the same reference numerals for convenience, and the description thereof will be omitted.

The oil feed pipe 4A of the double pipe 4 has a smaller diameter than the detection pipe 4B, and the oil feed pipe 4A is coaxially arranged in the detection pipe 4B. Two air holes 24 and 25 are vertically provided in the detection pipe 4B, and the tip end portion of the detection pipe 4B is vertically upwardly projected from the ground G of the gas station by 40 cm or more. At the top of the air holes 24, 25,
For example, umbrella-shaped covers 24A and 25A for preventing rainwater intrusion are provided. In this case, generally, the oil vapor leaked to the surface of the earth has a property of staying below 30 cm from the ground because it is larger than the specific gravity of air. The length is 40 cm or more.

A partition wall 26 is provided in the middle of the detection pipe 4B, and the detection pipe 4B is divided by the partition wall 26 into the first detection region 4C.
-1 and the second detection area 4C-2 are separated. As a result, the air flowing in from the air holes 24 is circulated only in the first detection area 4C-1 and is blocked from flowing into the second detection area 4C-2. Further, the air flowing in from the air holes 25 is allowed to flow only in the second detection area 4C-2 and is blocked from flowing into the first detection area 4C-1. That is, by setting the oil leak detection areas in the oil feed pipe 4A of the double pipe 4 to two places corresponding to the respective weighing machines 2-1 and 2-2, oil leak occurred at any place. It is possible to detect accurately.

Next, the operation of this embodiment having the above configuration will be described with reference to the flowchart of FIG.

Step SP1: The controller 5 sets the scan order counter to "1". As a result, scanning of the detection signal of the gas detection sensor 23 of the weighing machine 2-1 is started. That is, the detection of the presence or absence of oil leakage is started in the first detection area 4C-1 corresponding to the weighing machine 2-1 in the oil feed pipe 4A.

Step SP2: The control device 5 sets the gas monitoring time by the timer. As a result, when a predetermined time elapses from the time when the refueling person presses the gas monitoring switch, the suction means 21 is driven by the pump driving motor 9 during the gas monitoring time, and the first detection area 4C in the oil supply pipe 4A. Start sucking air from -1. At this time,
The gas detection sensor 23 detects the presence or absence of oil vapor in the air sucked by the suction means 21.

Step SP3: The control device 5 controls the oil supply pipe 4 based on the signal supplied from the gas detection sensor 23 of the weighing machine 2-1.
In the first detection area 4C-1 in A, it is determined whether or not gas leakage due to oil leakage has occurred. If gas leakage has occurred, the process proceeds to step SP4, while if gas leakage has not occurred, the process proceeds to step SP6.

Step SP4: The control device 5 supplies a refueling prohibition signal to the pump driving motors 9 of the weighing machines 2-1 and 2-2 to put the weighing machines 2-1 and 2-2 in the drive prohibited state. .
As a result, the refueling man puts the refueling nozzle 13 on the nozzle hook 1
When trying to refuel the vehicle by removing it from No. 5, an ON signal is supplied from the nozzle switch 14 to the control unit 5,
Since the pump drive motor 9 is in the drive prohibited state as described above, oil is not discharged from the tip of the oil supply nozzle 13. This makes it possible to ensure safety.

Step SP5: The control device 5 displays on the oil leak indicator 6 that the oil leak has occurred in the first detection area 4C-1 in the oil supply pipe 4A, and at the same time, the oil leak warning device 7 causes the refueling man to do so. Notify of oil leakage. As a result, it is possible to quickly perform maintenance of the oil leak location.

Step SP6: In the above-mentioned step SP3, if the gas leakage due to the oil leakage has not occurred, the control device 5
Determines whether the set value of the timer has reached the gas monitoring time. If the gas monitoring time has not been reached, the process proceeds to step SP3, and the gas leakage detection is continued, while if the gas monitoring time has expired, the process proceeds to step SP7.

Step SP7: The controller 5 increments the scan order counter by "1" to "2". As a result, scanning of the detection signal of the gas detection sensor 23 of the weighing machine 2-2 is started. That is, the weighing machine 2 in the oil supply pipe 4A
In the second detection area 4C-2 corresponding to -2, the detection of the presence or absence of oil leakage is started.

Step SP8: The control device 5 determines whether or not the count value of the scan order counter has reached the set value. That is, in the case of the present embodiment, when the count value is "2", the process returns to the step SP1, the scan order count is set to "1", and the weighing machine 2-1 in the oil feed pipe 4A is again set.
Detection of the presence or absence of gas leakage is started in the detection area 4C-1 corresponding to. On the other hand, when the count value does not reach "2", the process returns to step SP2 and the gas monitoring time of the timer is set.

As described above, the operation of sequentially monitoring the presence or absence of gas leakage in each detection area corresponding to each weighing machine is repeated.

[Modification] In the above embodiment, the case where two weighing machines are installed has been described, but the present invention is not limited to this, and it is possible to install a required number of machines.

In the above embodiment, the oil feed pipe 4A of the double pipe 4 has a smaller diameter than that of the detection pipe 4B, and the oil feed pipe 4A is arranged inside the detection pipe 4B. However, the present invention is not limited to this. It may be configured such that one pipe having a semicircular cross-section is used as an oil feeding pipe and the other pipe having a semicircular cross-section is used as a detection pipe by dividing the pipe into two parts by a plane including

In the above embodiment, the oil leak indicator 6 and the oil leak alarm 7 are arranged in the gas station building 1. However, the invention is not limited to this, and the oil leak indicator may be the oil supply amount indicator of each weighing machine. By sharing it with 16, the oil leakage point is indicated by the oil supply amount indicator 16
It is also possible to have a configuration in which an oil leakage alarm device is provided in each weighing machine.

In the above embodiment, the drive source of the suction means 21 is shared with the pump drive motor 9 for driving the oil supply pump 8, but the invention is not limited to this, and the drive source of the suction means 21 is separately provided. May be

[Effects of the Invention] As described above, in the oil supply system of the present invention, the oil supply pipe for supplying the oils of the oil storage tank to the oil pump upper side of the oil supply pump of the weighing machine, the oil storage tank, and the metering pipe are provided. With a double pipe structure consisting of a detection pipe for circulating air to and from the machine, the weighing machine, suction means for sucking air in the detection pipe from one end side of the pipe, and air sucked by the suction means A detection means for detecting the presence or absence of oil vapor in the inside is provided, and the detection means is informed that an oil leakage has occurred in the oil feeding pipe based on a detection signal associated with the detection of the presence or absence of oil vapor. Since the control means to connect is connected,
The following effects are achieved.

Detection of double pipes By detecting the presence or absence of oil vapor in the air in the pipes, the leakage of oils in the oil supply pipes can be detected, so the location of oil leaks can be accurately detected and the oil leaks can be detected. If it does, a notification is given, so the safety can be improved. This improves maintainability and prevents accidents such as explosions due to oil leaks.

Since it is different from the conventional configuration in which a conductor for oil detection is laid in the pipe and the oil leak of the pipe is electrically detected,
It is preferable in terms of safety.

Since the detection means is not provided on the pipe itself but on the weighing machine connected to the pipe, it is easy to inspect it, and when the pipe is damaged, only the damaged pipe should be checked. It is possible to provide a refueling system that requires only replacement and is easy to maintain.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a refueling system with a pipe leakage detection function according to an embodiment of the present invention, and FIG. 2 is a flow chart for explaining the operation of this embodiment. 2-1 and 2-2 …… Weighing machine, 3 …… Oil storage tank, 4 ……
Double piping, 4A ... Oil supply piping, 4B ... Detection piping, 4C
-1 ... 1st detection area, 4C-2 ... 2nd detection area, 5
... Control device (control means), 6 ... Oil leak indicator, 7
…… Oil leakage alarm device, 8 …… Oil supply pump, 12 …… Oil supply hose, 13 …… Oil supply nozzle, 21 …… Suction means, 23
...... Gas detection sensor (detection means), 24 ...... Air hole, 2
5 ... Air holes.

Claims (1)

[Scope of utility model registration request] 1. A weighing machine having an oil supply pump for pumping oil, an oil supply hose whose base end communicates with the oil delivery side of the oil supply pump, and an oil supply nozzle connected to the tip of the oil supply hose; An oil storage tank for storing oil, and a pipe having one end connected to the oil pumping side of the oil supply pump of the weighing machine and the other end connected to the oil storage tank, wherein the pipe is A double pipe consisting of an oil supply pipe for supplying the oil of the oil storage tank to the oil pumping side of the oil supply pump of the weighing machine, and a detection pipe for circulating air between the oil storage tank and the weighing machine With a structure, the weighing machine is provided with a suction unit that sucks air in the detection pipe from one end side of the pipe, and a detection unit that detects the presence or absence of oil vapor in the air sucked by the suction unit, In the detection means, Pipe leakage detection function with the fuel supply system characterized by Aburarui leaking to the oil feed pipe on the basis of a detection signal according to a detection of the presence or absence of class vapor formed by connecting the control means for informing of the occurrence.