WO2014061374A1

WO2014061374A1 - Fueling device

Info

Publication number: WO2014061374A1
Application number: PCT/JP2013/074335
Authority: WO
Inventors: 勉大滝; 和史高橋; 小池　毅
Original assignee: 株式会社タツノ
Priority date: 2012-10-19
Filing date: 2013-09-10
Publication date: 2014-04-24
Also published as: JPWO2014061374A1; JP6156750B2; PH12015500856A1; TWI636947B; TW201422519A; EP2910520A4; SG11201502344QA; EP2910520A1; PH12015500856B1; AU2013333226B2; AU2013333226A1; EP2910520B1; MY168305A; ZA201501973B

Abstract

[Problem] To provide a fueling device which can detect the inclusion of water in fuel oil and which is configured so that a sensor for detecting the inclusion of water is not necessary to have an explosion-proof structure. [Solution] The detection section (23a) of a sensor (23) for detecting the inclusion of water in oil is provided in a dangerous area, and devices (21, 22) for processing an optical signal from the detection section (23a) of the sensor (23) are provided in a non-dangerous area. The sensor (23) is provided with an optical fiber (23b) having the detection section (23a) provided at the tip thereof. The portion at which the optical fiber (23b) penetrates through the boundary between the dangerous area and the non-dangerous area can be sealed by a cable clamp (24).

Description

Lubrication device

The present invention relates to an oil supply apparatus that supplies fuel oil to an automobile, and more particularly to an oil supply apparatus having a function of detecting that water is mixed in the fuel oil.

At the gas station, the fuel oil supplied from the fueling device to the automobile is stored in an oil storage tank. Since this oil storage tank is buried in the basement of a gas station, water due to condensation of water vapor in the air may be mixed in, or groundwater may enter due to corrosion of the oil storage tank. In addition, since the oil storage tank and the oil supply device are connected by an oil supply pipe buried underground, if a small hole is opened in the oil supply pipe due to corrosion, groundwater will be drawn from this small hole and water will be mixed into the fuel oil. become.

And, if fuel oil mixed with water is supplied to automobiles, it may cause a serious accident of engine damage due to poor combustion. Under such circumstances, an oil supply device having a function of detecting water mixed in fuel oil is desired.

Here, it is conceivable to detect whether water is mixed using various sensors. However, the fuel oil handled by the refueling device is flammable, and the fuel oil supply system such as the pump unit and flow meter is located in the area where the fuel oil vapor exists, so-called danger area. Need to be placed. Therefore, when transmitting the detection result of the sensor as an electric signal, it is necessary to make the sensor and the electric device for processing the detection result have an explosion-proof structure so that no spark is generated. And since the sensor and electric equipment made into explosion-proof structure will enlarge, it is difficult to install in the inside of the narrow case of an oil supply apparatus.

As another conventional technique, there is a technique in which an oil supply control device and an oil supply amount indicator not having an explosion-proof structure are provided in an area (non-hazardous area) where fuel oil vapor is not filled (see Patent Document 1).

However, a sensor for detecting that water is mixed in the fuel oil needs to be provided in the fuel oil supply system, and the fuel oil supply system is arranged in a danger area where the fuel oil vapor exists. Therefore, also in the above-described prior art, the sensor for detecting that water is mixed in the fuel oil needs to have an explosion-proof structure, and the above-described problem cannot be solved.

Japanese Unexamined Patent Publication No. 11-106000

The present invention has been proposed in view of the above-described problems of the prior art, and is capable of detecting the mixing of water in fuel oil, and does not require an explosion-proof structure as a sensor for detecting the mixing of water. The object is to provide a device.

In order to achieve the above object, a fueling device of the present invention includes a detection unit for detecting whether water is mixed in fuel oil, and the detection unit is provided in a danger area; And a device provided in a non-hazardous area and for processing an optical signal from a detection unit of the detection sensor.

According to the present invention, since no electrical signal is used in the hazardous area, no spark is generated, and the detection part of the detection sensor does not have to have an explosion-proof structure.

In the fueling device, the detection sensor includes an optical fiber having the detection unit at a tip, and a portion where the optical fiber penetrates a boundary between the dangerous area and the non-dangerous area can be sealed with a cable clamp. . Accordingly, it is possible to prevent the fuel oil vapor in the dangerous area from entering the non-hazardous area.

The oil supply device is sealed and has an equipment case in which the inside is the dangerous area, a flow meter provided in the equipment case, and a fuel supply that is connected to the flow meter and has a dangerous area around it. A pipe, an oil hose connected to the oil supply pipe at a connection location, an oil nozzle provided at the tip of the oil hose, a sealed display case whose inside is the non-hazardous area, and the display case An oil supply control device, a display device, a water mixing detection control device and a photoelectric conversion device provided inside the optical fiber, connecting the optical fiber to the photoelectric conversion device, and extending from the display case into the danger area Then, the portion where the optical fiber penetrates the boundary between the danger area and the display case can be sealed with a cable clamp. Since there is no need for the explosion-proof control device and the photoelectric conversion device for detecting water contamination inside the display case, it is possible to give a margin to the layout of various devices.

The oil supply apparatus includes an oil supply pipe that connects an oil storage tank buried underground and the flow meter, and a pump unit provided in the oil supply pipe, and the detection unit includes the pump unit and the oil supply pipe. It can arrange | position between the connection location with the said oil supply hose. Since the fuel oil and water are evenly mixed by the pump unit and become cloudy (a state where water is present as fine particles in the fuel oil) at the location where the detection unit is disposed, It becomes easy to detect mixing of water.

The oil supply apparatus includes an oil supply pipe that connects an oil storage tank buried underground and the flowmeter, and a submergible pump provided in the oil supply pipe inside the oil storage tank, and the detection unit includes the submerged pump. It can arrange | position between a connection point with a bull pump and the said oil supply hose of the said oil supply pipe | tube.

The fueling device includes a stirrer provided in the oil feeding pipe between the submerged pump and the flow meter, and the detection unit includes a connection portion between the stirrer and the fueling hose of the fueling pipe. Between the two. Since the fuel oil and water are uniformly mixed by the stirrer and become clouded at the location where the detection unit is disposed, it is easy to detect the mixing of water into the fuel oil.

As described above, according to the present invention, it is possible to provide a fuel supply apparatus that can detect the mixing of water in fuel oil and does not require an explosion-proof structure as a sensor for detecting the mixing of water.

It is a partial cross section front view which shows the oil supply apparatus which concerns on the 1st Embodiment of this invention. It is an expanded sectional view explaining the attachment state of the cable clamp used with the oil supply apparatus of FIG. It is a perspective view which illustrates the state which attached the detection part of the optical fiber front-end | tip to the pump unit used with the oil supply apparatus of FIG. It is an expanded sectional view of the part which attached the detection part of the optical fiber front-end | tip to the pump unit of FIG. It is a characteristic view used when detecting whether water is mixed in fuel oil. It is a block diagram of the control apparatus of the fuel supply apparatus which determines whether water is mixed in fuel oil using the characteristic shown in FIG. It is a flowchart which shows control of the fuel supply apparatus based on this invention at the time of determining whether water is mixed in fuel oil using the characteristic shown in FIG. It is a partial cross section front view which shows the oil supply apparatus which concerns on the 2nd Embodiment of this invention. It is an expanded sectional view of the part which attached the detection part of the optical fiber front-end | tip to the stirrer used with the oil supply apparatus of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, an oil supply apparatus according to a first embodiment of the present invention will be described with reference to FIGS.

1, the fueling device 1 has a device case 2 and a display case 15. The inside of the device case 2 is a dangerous area where there is a high possibility that fuel oil vapor exists. The equipment inside the equipment case 2 has an explosion-proof structure. Inside the device case 2, a pump unit 4 driven by a motor 3, a flow meter 5 for measuring the amount of oil supply, and the like are provided.

The pump unit 4 is provided with an inlet 4A, a pump 4B, and a discharge port 4C, and a strainer 6 is provided at the inlet 4A and the discharge port 4C. The inlet 4 A of the pump unit 4 communicates with an underground oil storage tank 8 through an oil feeding pipe 7. The discharge port 4 C is connected to the flow meter 5. As described above, the pump 4B (gear pump in FIG. 1) is driven by the motor 3.

1, the oil supply pipe 9 connected to the flow meter 5 rises inside the column 10. An oil supply hose 11 is connected to the connection port 9 A at the tip of the oil supply pipe 9, an oil supply nozzle 12 is attached to the tip of the oil supply hose 11, and the oil supply nozzle 12 is hung on a nozzle hook 13. The area around the fuel supply pipe 9 is a dangerous area where there is a high possibility that vapor of fuel oil exists.

The display case 15 located above the device case 2 is a non-hazardous area where there is no fuel oil vapor. Unlike the equipment inside the device case 2, the fuel supply control device 16 and the indicator 17 provided inside the display case 15 do not have an explosion-proof structure. The oil supply control device 16 provided inside the display case 15 is connected to the motor 3 and the flow meter 5 inside the device case 2 by a signal line 18.

The display case 15 has a vapor barrier 15A. A cable clamp 19 is provided at a portion where the signal line 18 penetrates the vapor barrier 15A. In other words, the portion where the signal line 18 penetrates the vapor barrier 15 A is sealed with the cable clamp 19. Since the portion where the signal line 18 penetrates the vapor barrier 15A is sealed by the cable clamp 19, the fuel oil vapor inside the device case 2 is prevented from entering the inside of the display case 15 along the signal line 18. The

In the display case 15, a water detection control device 21 and a photoelectric conversion device 22 connected to the control device 21 are provided, and an optical fiber 23b is connected to the photoelectric conversion device 22. Here, the water detection sensor is comprehensively indicated by reference numeral 23 and has an optical fiber 23b. The sensor 23 is a detection sensor having a function of detecting that water is mixed into the fuel oil, and the detection portion 23a (see FIG. 4) is a light receiving portion at the tip of the optical fiber 23b.

As described above, the vapor barrier 15 A of the display case 15 is provided with the cable clamp 24, the optical fiber 23 b passes through the cable clamp 24 and is introduced into the equipment case 2, and the optical fiber 23 b is the oil flow path of the pump unit 4. It is arranged. Since the portion where the optical fiber 23b penetrates the vapor barrier 15A is sealed by the cable clamp 24, the vapor of the fuel oil inside the device case 2 is prevented from entering the inside of the display case 15 along the optical fiber 23b.

That is, the vapor of the fuel oil in the device case 2 is prevented from entering the display case 15 along the signal line 18, and the vapor enters the display case 15 along the optical fiber 23b. This is also prevented. For this reason, the display case 15 is sealed against the vapor of fuel oil inside the device case 2 and is a safe area (non-dangerous area) where no accident occurs even if an electric spark or the like occurs.

As shown in FIG. 4, the detection part 23a of the water mixing detection sensor 23 is provided at the tip of the optical fiber 23b (light receiving optical fiber 232). As will be described later, the water mixing detection sensor 23 is a light receiving sensor, and the detection portion 23a of the detection sensor 23 is connected from the oil supply pipe 7 communicating with the oil storage tank 8 in the base of the gas station to the connection location (connection of the oil supply hose 11). It is possible to arrange in the area between the opening 9A, but preferably, from the hatched area in FIG. 1, that is, from the accommodation position of the gear (rotating body) of the pump 4B, the connection port 9A (oil supply hose 11) It is preferable to arrange in any of the areas up to the connection point.

In FIG. 1, only the equipment related to the right oil supply hose 11 is shown for the inside of the equipment case 2 and the display case 15, and the configuration of the equipment related to the left oil supply hose 11 is omitted for simplification of illustration. To do.

FIG. 2 shows the state in which the optical fiber 23b penetrates the vapor barrier 15A of the display case 15 in detail. As described above, the portion where the optical fiber 23 b penetrates the vapor barrier 15 A is sealed with the cable clamp 24.

2, the base body 25 of the cable clamp 24 is fixed to the vapor barrier 15 A by a nut 26. The optical fiber 23 b passing through the inside of the cable clamp 24 is sealed by the packing 27.

As clearly shown in FIG. 2, the optical fiber 23b sealed by the cable clamp 24 is composed of two optical cables.

One of the two optical fibers 23b is an optical fiber 231 for irradiating light, and has a function of irradiating light from its tip (the end on the detection unit 23a side in FIG. 4). The other of the two optical fibers 23b is a light receiving optical fiber 232. As will be described later with reference to FIG. 4, the optical fiber 23b has a detection unit 23a at the tip, and the light received by the detection unit 23a is contained inside the display case 15. It has a function to transmit to the photoelectric conversion device 22.

Although not shown, it is also possible to configure so that the optical fiber 23b can function as both a light-emitting optical cable and a light-receiving optical cable.

In FIG. 2, the optical fiber 23 b (light emitting optical cable 231 and light receiving optical cable 232) inside the device case 2 is covered with a resin tube 29, and the tip of the resin tube 29 is fixed to a bracket 62 by a clamp 30. The bracket 62 is fixed to the vapor barrier 15 A by the nut 26. By fixing the optical fiber 23b with the clamp 30, the optical fiber 23b can be protected from vibration. Here, the optical fiber 23 b is covered with the resin tube 29 only inside the device case 2. In other words, in the unlikely event that the resin tube 29 is damaged due to an accident or the like, the fuel oil inside the device case 2 passes through the space between the inner wall surface of the resin tube 29 and the optical fiber 23b, and the fuel oil is displayed in the display case. This is to prevent a situation of entering the inside of the 15.

3 and 4 illustrate a state in which the detection unit 23a at the tip of the optical fiber 23b is disposed in the vicinity of the discharge port 4C of the pump unit 4. However, as described above, the detection unit 23a is hatched in FIG. 1 and is shown in any one of the regions (regions from the gear housing location of the pump 4B to the connection port 9A that is the connection location of the oil supply hose 11). Can be provided.

In the form described later, in order to detect water contamination using the water contamination detection sensor 23, it is necessary to be in a cloudy state so that water and fuel oil are uniformly mixed. The detection unit 23a of the sensor 23 is provided in the region closer to the fuel supply nozzle 12 than the gear housing location of the pump 4B because water and fuel oil are agitated by the gear of the pump 4B in such a region. This is because they are mixed uniformly and become cloudy, and the presence or absence of water can be detected.

3 and 4, a lid 31 is provided in the vicinity of the discharge port 4 C of the pump 4, and the lid 31 is fixed to the pump unit 4 with a bolt 32. The hollow bolt 34 is screwed into the hole 33 formed in the lid 31, the packing 35 is inserted into the hollow bolt 34, and the hollow bolt 36 is screwed. Then, the optical fiber 23 b is inserted into the hollow portion of the hollow bolt 36.

In other words, the hollow bolt 36 is screwed into the hollow bolt 34 screwed into the lid 31, the optical fiber 23 b is inserted into the hollow portion of the hollow bolt 36, and the hollow portion of the hollow bolt 34 is sealed with the packing 35. As shown in FIG. 4, the detection unit 23 a of the sensor 23 is provided at the distal end portion (the lower end portion in FIG. 4) of the optical fiber 23 b (light receiving optical fiber 232).

Next, an example of control for detecting whether or not water is mixed in the fuel oil in the fueling device of the present invention will be described with reference to FIGS.

As described above, the water mixed in the fuel oil is agitated when being pumped by the pump 4B of the pump unit 4, and becomes fine particles, and the mixture of the fuel oil and water becomes cloudy. A part of the light emitted from the tip of the optical fiber 231 for light irradiation is reflected by the fine water particles and is received by the detection unit 23a (of the sensor 23) at the tip of the optical fiber 232 for light reception. The amount of received light (the amount of light reflected by water particles) increases as the water mixing rate in the fuel oil increases (curve α in FIG. 5).

On the other hand, part of the light irradiated from the tip of the optical fiber for light irradiation 231 (light that did not hit the water particles) passes straight through the fuel oil mixed with fine water particles, and faces the opposite wall surface (see FIG. (Not shown), is again transmitted through the fuel oil, travels straight, and is received by the detector 23a at the tip of the optical fiber 232 for light reception. The amount of received light (light transmitted through the fuel oil, traveling straight, reflected by the opposing wall surface and received by the detection unit 23a) decreases as the water mixing rate in the fuel oil increases (curve β in FIG. 5). .

The total amount of light received by the detection unit 23a at the tip of the light receiving optical fiber 232 is the sum of the light amount of the curve α in FIG. 5 and the light amount of the curve β, and the characteristic is the curve “α + β” in FIG. Is displayed.

Here, the vertical axis in FIG. 5 is the amount of light received, and the horizontal axis is the water mixing rate. If the total amount of light received by the detection unit 23a is obtained (for example, “sensor detection result” in FIG. 5), and the point γ on the corresponding characteristic curve “α + β” as shown by the one-dot chain line in FIG. The numerical value δ on the horizontal axis of γ is the water mixing rate at that time.

6 shows a block diagram of the control device 21 that executes the control explained in FIG. 5, and FIG. 7 shows a flowchart of the control explained in FIG. The structure of the control device 21 and the control described in FIG. 5 will be described mainly with reference to FIGS.

The light (the amount of light received by the detection unit 23a) input to the photoelectric conversion device 22 through the light receiving optical fiber 232 is converted into an electric signal and read into the light amount calculation block 41 through the signal line L3 (step S1). ), The total amount of light received by the detector 23a is calculated (step S2). The calculated amount of received light is transmitted to the water mixing rate calculation block 42 via the line L4, and the water mixing rate is calculated from the characteristics (see FIG. 5) of the received light amount and the water mixing rate transmitted from the storage block 40. (Step S3).

The calculated water mixing rate is transmitted to the determination block 43 via the line L5. The determination result in the determination block 43 is sent to the notification processing block 44, the notification means 45, the fuel supply stop processing block 46, the fuel supply stop means 47, the maintenance / inspection processing block 48, and the maintenance / inspection via the line L6. 49 and the display means 50.

In the determination block 43, the water mixing rate of the water mixing rate calculating block 42 and the “threshold value” (the level of the water mixing rate transmitted from the storage block 40 via the line L2 or not) are determined. The threshold value is compared with a threshold value indicating whether or not the water mixing rate is at a normal level (step S4).

If the water mixing rate is equal to or less than the threshold value (NO in step S4), it is determined that the water mixing rate is a normal level (no problem level), and the process returns to step S1. At this time, the sensor 23 has detected that water is not mixed in the fuel oil. If the water mixing rate is greater than the threshold value (YES in step S4), the process proceeds to step S5. At this time, the sensor 23 detects that water is mixed in the fuel oil.

In step S5, it is only necessary to perform notification by the refueling control device 16 (see FIG. 1), whether notification and / or refueling stop processing is necessary, notification and / or refueling stop processing and / or maintenance check. It is determined whether processing is necessary.

In other words, if the water mixing rate is at a level that only requires notification, no refueling stop processing or maintenance inspection processing is performed. If the water mixing rate is at a level that requires refueling stop processing, the refueling control device 16 performs refueling stop processing. At that time, notification can also be performed. Further, when the water mixing rate is large, a refueling stop process and / or a process for maintenance inspection is executed. In this case, notification can also be performed.

According to the illustrated embodiment, the detection unit 23a of the sensor 23 is provided in the device case 2 that is a dangerous area, but the control device 21 that processes light (light signal) from the detection unit 23a of the sensor 23, the photoelectric conversion device Reference numeral 22 is provided inside the display case 15 which is a non-dangerous area.

Therefore, the detection unit 23a of the sensor 23 inside the device case 2 transmits and receives only light, and does not transmit and receive electrical signals. Therefore, even if the detection unit 23a of the sensor 23 is provided inside the device case 2 that may be filled with fuel oil vapor, the detection unit 23a does not generate a spark due to an electrical signal.

Further, since the optical signal from the detection unit 23a of the sensor 23 is converted into an electrical signal by the photoelectric conversion device 22 inside the display case 15 and processed by the control device 21, it corresponds to the detection result of the detection unit 23a. The electric signal is transmitted / received only inside the display case 15. Therefore, according to the illustrated embodiment, it is possible to detect whether or not water is mixed in the fuel oil using the detection sensor 23 while maintaining high safety.

In relation to this, in the illustrated embodiment, the detection unit 23a of the sensor 23 inside the device case 2 only transmits and receives light, and controls the optical signal from the detection unit 23a, and the photoelectric conversion device 22. Is provided inside the display case 15 which is a non-dangerous area. Therefore, it is not necessary for the detection unit 23a of the sensor 23, the control device 21, and the photoelectric conversion device 22 to have an explosion-proof structure.

Next, with reference to FIG.8 and FIG.9, the oil supply apparatus which concerns on the 2nd Embodiment of this invention is demonstrated. The oil supply device 51 includes a submerged pump 52 in the oil storage tank 8 instead of the pump unit 4 of the oil supply device 1, and also includes a stirrer 53 and a strainer 54 at the position of the pump unit 4 of the oil supply device 1. And different from the fueling device 1. In addition, about the same component as the said oil supply apparatus 1, the same reference number is attached | subjected or illustration is abbreviate | omitted and detailed description is abbreviate | omitted.

The submersible pump 52 has an impeller inside. As shown in FIG. 9, the stirrer 53 is provided with a screw hole 53a. A hollow bolt 34 is screwed into the screw hole 53a, and a packing 35 is inserted into the hollow bolt 34. The optical fiber 23b is inserted through the hollow portion 36. The detection portion 23a of the sensor 23 is provided at the tip (lower end) of the optical fiber 23b (light receiving optical fiber 232). Inside the stirrer 53, a plurality of stirring blades 53b are arranged.

Further, as in the above embodiment, the signal line 18 and the optical fiber 23b are sealed by the cable clamps 19 and 24 at the portion where the vapor barrier 15A that is the boundary between the device case 2 and the display case 15 is penetrated. The fuel oil vapor inside the device case 2 is prevented from entering the inside of the display case 15 along the optical fiber 23b. Therefore, the safety of the inside of the display case 15 as a non-dangerous area is always maintained.

In the present embodiment, as in the first embodiment, it is possible to grasp the presence or absence of water mixing before the fuel oil is supplied to the automobile. Then, necessary measures such as notification and refueling stop can be taken before the engine is stopped.

Note that the illustrated embodiment is merely an example, and is not a description of the purpose of limiting the technical scope of the present invention. For example, it is also possible to arrange | position the detection part 23a of the sensor 23 in the area | region between the connection location (connection port) 9A of the oil supply hose 11 from the oil supply pipe | tube 7 connected to the oil storage tank 8 of a gas station underground.

In addition, when the detection part 23a of the sensor 23 is arrange | positioned inside the oil supply pipe | tube 9 (refer FIG. 1), it is necessary to seal the location where the optical fiber 23b penetrates the vapor barrier 15A of the display case 15 with a cable clamp. .

DESCRIPTION OF SYMBOLS 1 Oil supply apparatus 2 Equipment case 3 Motor 4 Pump unit 4A Inlet 4B Pump 4C Discharge port 5 Flowmeter 6 Strainer 7 Oil supply pipe 8 Oil storage tank 9 Oil supply pipe 9A Connection port 10 Strut 11 Oil supply hose 12 Oil supply nozzle 13 Nozzle hook 15 Display case 15A Vapor barrier 16 Oil supply control device 17 Indicator 18 Signal line 19 Cable clamp 21 Water detection control device 22 Photoelectric conversion device 23 Water contamination detection sensor 23a Detection

sensor detection unit

23b, 231, 232 Optical fiber 24 Cable clamp 25 Base 26

Nut

27, 35 Packing 29 Resin tube 30 Clamp 31

Lid

34, 36 Hollow bolt 41 Light quantity calculation block 42 Water mixing rate calculation block 43 Determination block 44 Notification processing block 45 Notification means 46 Oil supply stop processing block 47 Means for Maintenance 48 Processing and Inspection Processing Block 49 Means for Maintenance and Inspection 50 Display Means 51 Refueling Device 52 Submersible Pump 53 Agitator 53a Screw Hole 53b Blade 54 Strainer

Claims

A detection unit for detecting whether water is mixed in the fuel oil, and the detection unit provided in the dangerous area;
An oil supply apparatus comprising: a device provided in a non-hazardous area and processing an optical signal from a detection unit of the detection sensor.
The detection sensor includes an optical fiber having the detection unit at the tip,
The oil supply device according to claim 1, wherein a portion where the optical fiber penetrates a boundary portion between the dangerous area and the non-hazardous area is sealed with a cable clamp.
A device case that is hermetically sealed and the inside is the dangerous area;
A flow meter provided inside the device case;
An oil supply pipe connected to the flow meter and surrounding the danger area;
An oil hose connected to the oil supply pipe at a connection point;
An oil nozzle provided at the tip of the oil hose;
A display case that is hermetically sealed and has a non-hazardous area inside;
An oil supply control device, an indicator, a water contamination detection control device and a photoelectric conversion device provided inside the display case,
The optical fiber is connected to the photoelectric conversion device, extends from the display case to the inside of the danger area,
The oil supply device according to claim 2, wherein a portion where the optical fiber penetrates a boundary portion between the danger area and the display case is sealed by a cable clamp.
An oil supply pipe connecting an oil storage tank buried underground and the flow meter;
A pump unit provided in the oil feeding pipe,
The said detection part is arrange | positioned between this pump unit and the connection location with the said oil supply hose of the said oil supply pipe | tube, The oil supply apparatus of Claim 3 characterized by the above-mentioned.
An oil supply pipe connecting an oil storage tank buried underground and the flow meter;
A submerged pump provided in the oil feeding pipe inside the oil storage tank,
The fueling device according to claim 3, wherein the detection unit is disposed between the submerged pump and a connection location of the fueling hose of the fueling pipe.
A stirrer provided in the oil feeding pipe between the submerged pump and the flow meter;
The oil supply device according to claim 5, wherein the detection unit is disposed between the stirrer and a connection portion between the oil supply pipe and the oil supply hose.