JP2016190658A - Liquid fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable abnormal commingling of water with liquid fuel, which is to be supplied to a supply object, to be accurately and stably detected even in a fuel supply device which has a water detector with a flow rate of the liquid fuel flowing in a detection flow passage thereof increasing.SOLUTION: Every time when confirming fuel supply monitoring timing, a liquid fuel supply device accurately and stably detects abnormal commingling of externally derived water with fuel in a manner that slows a flow rate of the fuel flowing in a detection flow passage by reducing a supply flow rate thereof sent from a pump unit 11 to a fuel supply nozzle 17 regardless of a state of an operation lever of a fuel supply nozzle 17 even when operated to fully open the same. Then, after confirming no abnormal commingling of the externally derived water with the fuel, the liquid fuel supply device automatically restores the fuel supply flow rate of the fuel sent from the pump unit 11 to the fuel supply nozzle 17.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel supply device that supplies fuel stored in a liquid storage tank to a supply target such as a vehicle, and detects whether water is mixed in the fuel supplied to the supply target. The present invention relates to a fuel supply device having a function.

  As a type of fuel supply device, there is known a fuel supply device that is installed in a gas station such as a gas station and inserts a cylinder tip of a fuel nozzle into a fuel supply port of a vehicle and supplies fuel such as gasoline and light oil to a fuel tank of the vehicle. It has been. A fueling device is a vehicle to be supplied with fuel pumped up from an underground tank (liquid storage tank) via a pipe via a fueling system consisting of a fueling hose and a fueling nozzle provided at the tip of the fueling hose. It is configured to supply to.

  In the fuel supply device including such a fuel supply device, a water detector for detecting the amount of water mixed in the fuel in the fuel supply path is provided, and the fuel supplied to the supply target based on the detection output is provided. When water mixed in is detected, there is a fuel supply device provided with a water mixing detection function for notifying that effect.

  For example, in Patent Document 1, the water reservoir provided below the fuel supply path has a specific gravity intermediate between water and fuel, and is displaced in response to the displacement of the boundary surface between water and fuel in the water reservoir. A water detection mechanism with a float is installed, water with a specific gravity greater than the fuel stays in the water reservoir, the amount of water stored in the water reservoir exceeds a predetermined amount, and the float rises to a predetermined height position. A technique is disclosed that, when detected, determines that water is abnormally mixed in the fuel to be supplied to the supply target, and notifies that effect.

Japanese Utility Model Publication No. 61-38645

  By the way, in a fuel supply device such as a fuel supply device, fuel is supplied to a supply target. Therefore, when flowing in the fuel supply path, the water mixed in the fuel is different in specific gravity from the fuel. There is a tendency to flow through the fuel supply path in a state of being diffused (dispersed) in the fuel without accumulating below the fuel supply path.

  In the fuel supply device described in Patent Document 1, since the water reservoir is provided below the fuel supply path, when the fuel flows in the fuel supply path, the water mixed in the fuel is also reduced. It may flow and water may not accumulate in the water reservoir, and as a result, water in the fuel cannot be detected.

  In addition, in order to detect water in the fuel flowing in the fuel supply path, it is considered to install a water detector at a location where the fuel flow changes in the fuel supply path, such as a flow path bend or a flow path bend. Has been. In this configuration, since water has the property that the density (specific gravity) is greater than that of fuel, when the fuel supplied to the supply object flows through the detection flow path of the water detector consisting of the elbow part of the piping system, The water diffused (dispersed) in the fuel is more likely to flow in the lower area than the upper area in the detection flow path, particularly in the lower bottom of the bent portion, orthogonal to the inflow side of the elbow part, and outflow of the elbow part. It stays in the lower corner (water reservoir) of the bent portion on the side. Therefore, the water in the flowing fuel can be detected by detecting the water remaining in the water reservoir by the water detector provided in the water reservoir. Here, the water (water cluster) staying at the lower corner (water reservoir) of the bent part on the outflow side can be detected by the water detector.

  However, it has been found that the fuel supply device having the water mixing detection function described above has the following problems.

  The configuration of the water mixing detection function including the water detector described above is a high discharge type (for example, 90 L / min) in which the fuel discharge flow rate from the nozzle is set higher than the standard discharge flow rate (for example, 40 L / min). min), when the discharge flow rate is high, the flow rate of the fuel flowing through the detection flow path (elbow part) of the water detector is higher than that of a fuel supply device with a standard discharge flow rate. As the fuel flows faster, the flow rate of the water cluster diffusing (dispersing) in the fuel increases while the fuel flows through the detection flow path (elbow part) at a high discharge flow rate. In particular, there is a tendency that the gas does not stay in the lower corner portion of the bent portion and flows to the downstream of the fuel supply path through the upper region in the detection flow path or the upper corner portion of the bent portion. This makes it difficult to detect water mixed in the fuel.

  Therefore, if the water mixing detection function using the water detector described above is applied to a high discharge type fuel supply device as it is, the fuel flowing through the detection flow path when the discharge flow rate of fuel from the nozzle is set to high discharge The flow rate of water mixed in the fuel also increases, so that the water mixed in the fuel is not easily stored in the water storage part of the water detector, and the water stored in the water storage part is reduced. There was a problem that it was difficult to detect with a sensor.

  The present invention has been made in view of the above-described problems, and is a fuel supply device that increases the flow rate of fuel flowing through the detection flow path of the water detector, such as a high-discharge fuel supply device. If water is mixed into the fuel supplied to the supply target due to corrosion or cracks in the liquid storage tank or piping, the water can be accurately and stably mixed into the fuel. It is an object of the present invention to provide a fuel supply device that can detect.

  In order to solve the above problems, a fuel supply apparatus according to the present invention is provided in a fuel supply path for supplying fuel from a liquid storage tank to a supply target, and in the fuel supply path, and the fuel in the liquid storage tank is supplied to the fuel supply path. A liquid supply device for supplying liquid toward the nozzle at the tip of the fuel and a fuel supply path, and the amount of water mixed in the fuel supplied to the supply target through the fuel supply path is distributed by the fuel. A fuel to be supplied to a supply target through a fuel supply path based on a water detector detected by a sensor provided in a channel bending portion or a channel bending portion in the middle of the detection channel and the detection output of the water detector A fuel supply device that includes a water mixture detection unit that detects whether or not water is mixed therein, and is provided in the fuel supply path and is fed from the liquid storage tank toward the nozzle. A flow control device for adjusting the fuel supply flow rate; Prior to detecting whether or not water is mixed in the fuel supplied to the supply target by the mixing detection unit, the supply flow rate of the fuel sent from the liquid storage tank to the nozzle is the normal supply. And a flow rate adjustment control unit that controls the operation of the flow rate adjusting device so as to be temporarily lower than the flow rate.

  According to the fuel supply device of the present invention, prior to detecting whether or not water is mixed in the fuel supplied to the supply target, the fuel supplied from the liquid storage tank toward the nozzle Since the supply flow rate is configured to be temporarily lower than the normal supply flow rate, the flow rate of the water in the fuel is temporarily reduced during detection of the presence or absence of the water, and the flow path bend or Water stays in the channel bending portion, and the water stored in the channel bending portion or the channel bending portion can be detected with high accuracy and stability by the water detector.

  Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

It is a schematic block diagram of one Example of the high discharge type oil supply apparatus as one Embodiment of the fuel supply apparatus which concerns on this invention. It is the schematic block diagram which showed typically the structure of one Example of the water detector shown in FIG. It is a schematic diagram of the water mixing detection system comprised in the oil supply apparatus shown in FIG. 1 including the water detector and the water mixing detection part. It is the figure which represented typically the distribution | circulation state of the fuel in the detection flow path of a water detector when the supply flow rate of a fuel is not a high discharge state. It is the figure which represented typically the state in which the fuel mixed with water is distribute | circulating the detection flow path when the supply flow rate of a fuel is a high discharge state. It is a flowchart of one Example of the oil supply operation | work process which a control apparatus performs at the time of operation of a fuel supply apparatus including the countermeasure process at the time of abnormality at the time of water mixing. It is a flowchart of one Example of a water mixing detection process including a water mixing determination process. It is the flowchart which showed one Example of the water mixing determination process started by step S13 shown in FIG. FIG. 9 is a flowchart showing a modification of confirmation of monitoring timing during refueling (step S21) in the water mixing determination process shown in FIG. It is a schematic block diagram of the 1 pump 2 meter type oil supply apparatus as another embodiment of the fuel supply apparatus which concerns on this invention. It is the flowchart which showed the modification of the setting change (step S15, S25) to the high flow volume (high flow velocity) in the water mixing determination process shown in FIG.

  An embodiment of a fuel supply device according to the present invention is installed in a gas station such as a gas station, and a cylinder tip of a fuel nozzle is inserted into a gas supply port of a vehicle or the like, and fuel such as gasoline or light oil is supplied to a fuel tank of the vehicle or the like. The refueling device to be replenished will be described as an example. The fuel supply device according to the present invention is not limited to the fuel supply device, and includes a fuel supply device that supplies liquid fuel or liquefied gas other than gasoline and light oil to the supply target.

  First, as a fuel supply device according to the present embodiment, a ground-installed high-discharge fueling device will be described as an example with reference to the drawings. The high discharge type oil supply device according to the present embodiment is different from the normal standard discharge type oil supply device in that the configuration of a predetermined component device such as an oil supply nozzle, an oil supply hose, a pump, etc. is different in discharge flow rate. However, in the description of the configuration, the description of the difference in the configuration of these components is omitted.

  FIG. 1 is a schematic configuration diagram of an example of a high discharge type oil supply device as an embodiment of a fuel supply device according to the present invention.

  The high discharge type oiling device 1 according to the present embodiment controls devices such as a pump unit 11, a pump motor 12, a flow meter 13, a flow control valve 14, a water detector 50, and the like in the device main body 2. While the control device 30 is housed, the device main body 2 has a structure in which an oil supply hose 16 having an oil supply nozzle 17 connected to the tip is led out.

  The pump unit 11 has a configuration in which a strainer, a pump, a gas-liquid separator, a filter, a check valve and the like are accommodated in a casing having a suction port and a discharge port. The pump unit 11 has a suction port communicated with the inside of the underground tank 42 via the underground pipe 41, and a discharge port communicated with the inflow port of the flow meter 13. When the pump of the pump unit 11 is driven by the driving of the pump motor 12, the pump unit 11 sucks the fuel stored in the underground tank 42 from the suction port through the strainer as a liquid-feeding device. After separating the gas-enriched liquid with the separator, the gas-enriched liquid is discharged from the discharge port through the filter and the check valve. The gas-enriched liquid separated by the gas-liquid separation device is separated from the gas in the gas separation chamber in the casing, and the separated gas is discharged out of the casing, while the fuel from which the gas is separated is pumped It is returned to the suction side.

  The flow meter 13 has an inflow port communicated with the discharge port of the pump unit 11, an outflow port communicated with the flow rate control valve 14, and the amount of fuel liquid sent from the pump unit 11 toward the fuel supply hose 16 and the fuel supply nozzle 17. Measure. A flow rate transmitter 15 is attached to the flow meter 13, and a flow rate pulse proportional to the flow of the fuel liquid for each unit flow rate is output from the flow rate transmitter 15.

  The flow control valve 14 is provided in a liquid supply path between the pump unit 11 and the oil supply hose 16, and is supplied from the pump unit 11 to the oil supply hose 16 and the oil supply nozzle 17 through the flow meter 13 as a flow rate adjusting device. Adjust the supply flow rate (flow velocity, discharge rate) of the liquid to be liquefied. The flow control valve 15 is configured to be capable of adjusting the flow rate in at least two stages of a small flow rate and a large flow rate based on the drive control signal. As the flow control valve 15, for example, a variable throttle valve, an on-off valve whose valve opening can be adjusted, or a flow adjustment mechanism unit having a bypass flow path provided with an on-off valve can be used. In this embodiment, as the flow control valve 15, a multistage throttle valve capable of adjusting the flow rate in two stages of a small flow rate and a large flow rate is used. For example, an on-off valve or the like whose valve opening degree can be adjusted is used. It is also possible to supply / shut off fuel, for example, to serve as a safety valve or a metering valve in preset fueling. In the illustrated example, the flow control valve 15 is arranged in the liquid supply path on the outlet side of the flow meter 13, but the flow rate between the discharge port of the pump unit 11 and the inlet of the flow meter 13 is not limited. You may arrange | position to a liquid path.

  The oil supply nozzle 17 at the tip of the oil supply hose 16 led out from the oil supply device body 2 opens and closes the valve in the nozzle body in response to the operation of the operation lever. In addition, if the nozzle tip of the oil supply nozzle 17 is held at the oil supply port to be supplied and the operation lever is in the valve opening operation state and is hooked on the lever hook, the operation lever can be closed regardless of the valve closing operation. An automatic valve closing mechanism is provided in which the valve is automatically closed when the fuel level reaches the nozzle tube tip.

  The oil supply nozzle 17 is placed on the nozzle storage portion 18 provided on the housing surface of the apparatus main body 2 during standby, and is removed from the nozzle storage portion 18 during the oil supply operation. used. The nozzle storage unit 18 is provided with a nozzle switch 19 that detects the removal of the fuel supply nozzle 17 from the nozzle storage unit 18 and the return to the nozzle storage unit 18.

  The oil supply nozzle 17 and the oil supply hose 16 become an oil supply system that is actually handled and operated by an operator during the fuel supply operation in the fuel supply path of the fuel supply device 1 from the underground tank 41 to the fuel supply nozzle 17. During the refueling operation, the refueling information such as the amount of refueling supplied from the refueling system to the supply target is provided on the housing surface of the main body 2 of the fueling apparatus body 2 in correspondence with the refueling system together with other information such as alarms and guidance. Displayed on the display 20.

  The control device 30 includes a microcomputer device provided with a memory, an input / output interface, and the like. The control device 30 receives a detection signal of the nozzle switch 19 and the like, and controls each part of the oil supply device such as the pump motor 12 and the display device 20 based on these signal inputs.

  Specifically, based on the detection signal from the nozzle switch 19, the control device 30 activates the pump motor 12 by taking out the fuel supply nozzle 17 from the nozzle storage portion 18 and hangs the fuel supply nozzle 17 back to the nozzle storage portion 18. Therefore, the pump motor 12 is stopped, and functions as an oil supply control unit that controls the supply of the oil to the oil supply nozzle 17. Further, the control device 30 functions as an oil supply amount calculation display unit that calculates the oil supply amount during the oil supply operation based on the input of the flow rate pulse from the flow rate transmitter 14 and displays it on the display 20.

  Further, the control device 30 is communicatively connected to a POS terminal for a gas station (sales point information management machine) (not shown) via a local area network (so-called gas station LAN) in the gas station, and is supplied from the POS terminal for the gas station. On the basis of the reception of the refueling work permission and the refueling work prohibition, the operation of each part of the device including the driving of the pump motor 12 based on the operation of the refueling nozzle 17 is permitted or prohibited, and the amount of refueling when the refueling work is finished Such information is transmitted to a POS terminal for a gas station for issuing a slip.

  In the fuel supply apparatus 1 according to the present embodiment, in addition to the above-described configuration, the water detector 50 is provided at an appropriate position in the fuel supply path from the underground tank 42 to the fuel supply nozzle 17. The water detector 50 detects the amount of water mixed in the fuel supplied from the underground tank 42 to the fuel supply nozzle 17 by the pump unit 11.

  In the illustrated example, the water detector 50 is disposed in the fuel supply path on the suction side of the pump unit 11 and is detachably attached to the suction port of the pump unit 11 by the apparatus main body 2 in a gas-liquid tight manner. Yes. As a result, the suction port of the pump unit 11 is configured to be connected to the other end of the underground pipe 41 that is in communication with the inside of the underground tank 42 through the water detector 50. At that time, the water detector 50 uses the position adjustment pipe 49 as necessary, so that the flow direction of the fuel flowing into the flow direction conversion unit 55 described later of the water detector 50 is in the horizontal direction. It has become.

  And the control apparatus 30 functions also as a water mixing detection part which detects whether there is abnormal mixing of water in the fuel supplied to a supply object based on the detection output of this water detector 50. FIG. It has become. Accordingly, the water detector 50 is provided with a detection circuit 61 for detecting the mixing of water into the fuel, and the control device 30 is provided with a detection circuit 61 of the water detector 50 via the power supply / barrier 62. Is also input.

  Based on the detection output from the detection circuit 61 attached to the water detector 50, the control device 30 as the water contamination detection unit has water exceeding a predetermined moisture content in the oil liquid fed to the oil supply nozzle 17. A water mixing determination process for determining the time of mixing water is performed, and when this water mixing time is detected, a countermeasure process for abnormalities is further performed as necessary. The water mixing determination process performed by the control device 30 based on the detection output of the water detector 50 as the water mixing detection unit will be described in detail later.

  FIG. 2 is a schematic configuration diagram schematically showing the configuration of one embodiment of the water detector shown in FIG. FIG. 2A is an overall configuration diagram of the water detector, and FIG. 2B is an enlarged view of a sensor portion in the water detector.

  The water detector 50 has a detector housing 51 in which an inlet 52 and an outlet 53 are formed. A detection flow path 54 that communicates between the inflow port 52 and the outflow port 53 is extended inside the detector housing 51. The detection flow path 54 is a substantially L-shaped detection flow path including a flow direction conversion portion 55 formed of a bent portion or a curved portion in the middle. The fuel from the underground tank 42 flows into the inflow port 52 through the underground pipe 41, and the fuel that has flowed through the detection flow path 54 flows out toward the refueling nozzle 17 from the outflow port 53.

  In the present embodiment, as shown in FIG. 2A, the detector casing 51 includes a cylindrical straight pipe-shaped inflow side casing section 51i and a cylindrical straight pipe-shaped outflow side casing section 51o. The flow paths are in communication with each other to form an L-shaped elbow pipe connected integrally. The peripheral edge of each of the inlet 52 and outlet 53 in the detector housing 51 is a mating pipe to which the water detector 50 is connected, that is, in the case of this embodiment, the suction port of the pump unit 11 and the position adjusting pipe. Fastening flanges for connection with 49 are formed.

  The flow direction converter 55 is configured by a flow path portion of the detection flow path 54 that changes the fuel outflow direction Fo with respect to the fuel inflow direction Fi. In the present embodiment, as shown in FIG. 2, the flow direction conversion unit 55 converts the flow of fuel flowing in from the inflow port 52 along the horizontal direction to the upward fuel flow along the vertical direction toward the outflow port 53. Change to flow. The flow direction conversion unit 55 has a bent or curved cross-sectional shape along the flow direction. The flow direction conversion angle θ between the fuel inflow direction Fi and the outflow direction Fo is not limited to a right angle, but may be an acute angle or an obtuse angle near the right angle.

  In the water detector 50 shown in FIG. 2, the detection flow path 54 at the connection portion of each of the inflow side casing 51 i and the outflow side casing 51 o corresponds to the flow direction conversion section 55 that changes the fuel flow direction. The flow direction converter 55 serves as a terminal end of the flow path in the inflow side casing 51i and a start end of the flow path in the outflow side casing 51o, along the detection flow path 54i of the inflow side casing 51i. A flow path inner wall surface 55p that resists the fluid pressure of the inflowing fuel.

  The water detector 50 is positioned at a predetermined distance from the flow path inner wall surface 55q on the lower side in the height direction connected to the flow path inner wall surface 55p in the flow direction conversion section 55 of the detection flow channel 54, A sensor main body 56 is accommodated. The sensor body 56 is attached to the sensor mounting hole 51a formed through the detector casing 51 of the flow direction conversion portion 55 while maintaining liquid-tightness through a seal member (not shown), while the front end side of the sensor body 56 is It is detachably mounted so as to protrude into the detection channel 54. As a result, the water detector 50 can perform maintenance of the sensor body 56 by removing the sensor body 56 from the sensor portion mounting hole 51a without removing the detector housing 51 from the fuel supply path. Yes.

  The sensor body 56 is configured by integrally arranging a detection electrode 57 and a ground electrode 58 with an insulating portion 59 interposed therebetween. In the present embodiment, the detection electrode 57 positioned on the distal end side of the sensor main body 56 is connected to the ground electrode 58 positioned on the proximal end side of the sensor main body 56 or the detector casing 51 made of a conductive member by the insulating portion 59. The flow direction conversion portion 55 is disposed in the flow direction conversion portion 55 while being insulated from the flow path inner wall surfaces 55p and 55q of the flow direction conversion portion 55 by a predetermined distance. On the other hand, the ground electrode 58 on the proximal end side of the sensor main body 56 is disposed in the flow direction conversion unit 55 in a state where the ground electrode 58 is in contact with the detector casing 51 made of a conductive member and is in conduction with the detector casing 51. . As a result, between the detection electrode 57 and the flow path inner wall surface 55q of the detector housing 51 facing the detection electrode 57 in a state of being separated from the detection electrode 57, the amount of water in the fuel interposed therebetween is determined. Thus, a capacitive or conductive water detection sensor 60 whose electric characteristics such as capacitance or resistance change is formed.

  The specific configuration of the sensor body 56 of the water detector 50 is not limited to the embodiment shown in FIG. In the present embodiment, the flow path inner wall surface 55q of the detector housing 51 facing the detection electrode 57 in a state of being separated from the detection electrode 57 is substantially formed by taking as an example the case where the detector housing 51 is made of a conductive member. For example, when the detector casing 51 is made of a non-conductive member, the ground electrode 58 is opposed to the detection electrode 57 in a separated state. It is also possible to arrange it in the flow direction converter 55. In the embodiment shown in FIG. 2, the water detector 50 has been described as detecting a change in capacitance or resistance as an electrical characteristic that changes according to the amount of water in the fuel. The electrical characteristics of the detection target that changes according to the amount of water are not limited to these.

  Next, a description will be given of a water contamination detection system configured to include the water detector 50 and the control device 30 as a water contamination detection unit in the fuel supply device 1 shown in FIG. In the description, the sensor main body 56 of the water detector 50 is in contact with the detection electrode 57 of water diffused (dispersed) as a water cluster in the fuel flowing through the detection flow path 54, and the detection electrode 57 and the detection electrode. Conductive water detection in which the conduction state (resistance value) between the detection electrode 57 and the ground electrode 58 changes according to the amount of water that enters between the inner wall 55q of the flow path of the container housing 51 and intervenes. A description will be given assuming that the sensor 60 is used.

  FIG. 3 is a schematic diagram of a water contamination detection system configured to include a water detector and a water contamination detection unit provided in the fueling apparatus shown in FIG. 1.

  The water contamination detection system of the present embodiment includes a water detector 50, a detection circuit 61, a power source / barrier 62, a control device 30, and a flow rate control valve 14.

  The water detector 30 includes a detection electrode 57 and a ground electrode 58, and constitutes a conductive water detection sensor 60. The detection circuit 61 drives the water detector 30 and amplifies the detection signal supplied from the water detection sensor 60 at that time, and compares it with a preset water detection threshold value. The presence or absence of contact with the detection electrode 57 of water diffusing (dispersing) as a cluster or the presence or absence of intervening water that enters between the detection electrode 57 and the flow path inner wall surface 55q of the detector housing 51 is determined. The determination result is output as a water detection signal. The power source / barrier 62 generates circuit power for the detection circuit 61 and supplies it to the detection circuit 61. The water detection signal supplied from the detection circuit 61 is transmitted between the water detector 50 side and the control device 30 side by the barrier. The circuit is insulated between them and supplied to the control device 30.

  Based on the water detection signal supplied from the water detector 50 side, the control device 30 determines water contamination in which water exceeding a predetermined moisture content is mixed in the oil liquid fed to the oil supply nozzle 17. When the water contamination determination process is performed and this water contamination is detected, the water contamination is notified and an abnormality countermeasure process is performed as necessary. Of course, when water is detected, it may be notified.

  In addition, in the water contamination detection system of the present embodiment, the control device 30 is used as a flow rate adjustment device when taking in the water detection signal from the detection circuit 61 via the power supply / barrier 62 in order to perform the water contamination determination process. The flow rate control valve 14 is controlled to adjust the supply flow rate (flow velocity, discharge amount) of the fuel fed from the pump unit 11 to the fuel hose 16 and the fuel nozzle 17 via the flow meter 13. It has become.

  When the water contamination detection system of the present embodiment takes in the water detection signal from the detection circuit 61, the supply flow rate of the fuel sent from the pump unit 11 to the fuel supply hose 16 and the fuel supply nozzle 17 via the flow meter 13 The configuration for adjusting the (flow velocity, discharge amount) is the fuel flow in the detection flow path 54 of the water detector 50, which is unique to the high discharge type fueling device 1 having a high fuel supply flow rate (flow velocity, discharge amount). It depends on the condition.

  FIG. 4 is a diagram schematically illustrating the fuel flow state in the detection flow path of the water detector when the supply flow rate of the fuel fed from the pump unit toward the fuel supply nozzle is not in a high discharge state. . 4A is a diagram schematically illustrating a state in which the fuel supply is stopped, and FIG. 4B is a diagram schematically illustrating a state in which the fuel is being discharged.

  FIG. 5 schematically shows a state where the fuel mixed with water is flowing through the detection flow path when the supply flow rate of the fuel fed from the pump unit toward the fuel supply nozzle is in a high discharge state. FIG. 4 and 5, the configuration of the water detector already described with reference to FIG. 2 is given the same reference numeral in the drawings and will not be described repeatedly.

  For example, if the operator operates the operation lever of the fueling nozzle 17 in a half-opened state and is hooked on the lever hook to perform the fueling operation with a low discharge amount, the fuel discharge amount from the fueling nozzle 17 is limited. The supply flow rate of the fuel fed from 11 to the fuel supply nozzle 17 is set so that the operator fully opens the operation lever of the fuel supply nozzle 17 and is hooked on the lever hook, and a high discharge amount (for example, 90 L / min) It becomes lower than the case of performing the refueling work.

  As shown in FIG. 4A, in the fuel supply stop state, the fuel in the fuel supply path does not flow, and therefore water mixed in the fuel (water cluster w) naturally does not flow. Thereafter, water having a specific gravity greater than that of the fuel (water cluster w) collects downward and stays on the bottom surface (55q) of the inner wall surface of the flow path.

  In FIG. 4B, when the fuel supply flow rate is in a low discharge state, the water (water cluster w) in the fuel is affected by the flow of fuel from Fi to Fo, but the flow velocity is higher than in the high discharge state. Since it is low, when it flows through the detection flow path 54 of the inflow side casing 51i, it tends to flow while gathering downward due to its specific gravity, and the flow direction conversion section 55 resists the fluid pressure of the fuel. Hands are blocked by the wall surface 55p, and consist of a lower region on the side of the flow channel inner wall surface 55q and a bent portion outer region (a valley-folded corner portion in the detection flow channel 54) formed by a connecting portion with the flow channel inner wall surface 55p. It is easy to collect in the water reservoir. In addition, the water collected in the water reservoir cannot flow out of the flow direction converter 55 to the outlet 53 because the flow rate of the fuel flowing through the detection channel 54 is not extremely high, and the fuel flows. Even in the situation where it is, it stays in the water reservoir.

  On the other hand, for example, when the operator fully opens the operation lever of the oil supply nozzle 17 and is hooked on the lever hook, and water is being supplied at a high discharge amount (for example, 90 L / min), water is mixed in. When the flowing fuel passes through the flow direction changing portion 55, even if the size of the water cluster w diffusing (dispersing) in the form of water bubbles in the fuel is large and the number is increasing, Since the supply flow rate of the fuel in which water is mixed becomes much faster, the water cluster w diffusing (dispersing) in the fuel while the fuel flows through the detection flow path 54 is The water cluster w that is abnormally mixed in the fuel is not easily collected in the water reservoir, as it does not collect in the lower area on the flow path inner wall surface 55q side or the bent area outside the flow path inner wall surface 55p side (FIG. 5). . Further, the amount of water W that can be stored in the water reservoir during fuel supply increases because the fuel flowing through the detection flow path 54 is clustered again from the water reservoir into the flow and diffuses and flows out. Also decreases. As a result, the water detector 50 and the detection circuit 61 enter the water cluster w and the water W from the water detection electrode 57 and enter between the detection electrode 57 and the flow path inner wall surface 55q of the detector housing 51. As a result, the water cluster w and the water W intervening in the area are reduced, and the detection circuit 61 does not output a detection signal that exceeds the water detection threshold.

  Therefore, in the oil supply device 1 of the present embodiment, in the water contamination detection system, the control device 30 operates the flow rate control valve 14 as a flow rate adjusting device when the control device 30 takes in the water detection signal from the detection circuit 61. Control is performed so that the supply flow rate (flow velocity, discharge amount) of the fuel fed from the pump unit 11 toward the fuel supply nozzle 17 becomes a predetermined supply flow rate. In the following description, the adjustment target is described as a supply flow rate per unit time. However, the adjustment target is not limited to this, and may be, for example, a supply time per predetermined amount.

  Next, including the adjustment of the fuel supply flow rate per unit time, the water mixing determination process including the adjustment of the fuel supply flow rate (flow velocity, discharge amount) performed by the control device 30 in the water mixture detection system, when abnormal The countermeasure process will be described with reference to the drawings.

  FIG. 6 is a flowchart of an embodiment of a refueling operation process performed by the control device when the refueling device is in operation, including a countermeasure process at the time of abnormality when water is abnormally mixed in the fuel.

  In the fueling apparatus 1, after starting, the control apparatus 30 monitors whether or not the fueling work has been started (step S01). The control device 30 detects the start of the refueling operation by inputting a refueling operation start signal such as a detection signal input from the nozzle switch 19 based on removal of the refueling nozzle 17 from the nozzle housing portion 18. When detecting the start of the refueling operation, the control device 30 confirms whether or not the operation is prohibited (step S02). This work prohibition includes a state in which refueling work permission has not been received from the POS terminal for the gas station, and a liquid feed forced stop state at the time of detecting abnormal mixing of water into the fuel supplied to the fuel nozzle 17. If the operation is not prohibited, the control device 30 activates the pump motor 12 and starts supplying fuel from the pump unit 11 toward the fuel supply nozzle 17 (step S03). If the work is prohibited, the fact is notified by the display 20 or a buzzer (not shown) (step S09).

  After that, when the fuel supply nozzle 17 is opened and the actual fuel supply to the supply target is started, the control device 30 calculates the amount of liquid supply based on the flow rate pulse output from the flow rate transmitter 15 and supplies the fuel. The amount of liquid is displayed on the display 20 (step S04). Further, in parallel with the calculation / display of the liquid supply amount, the control device 30 monitors whether or not the liquid supply forced stop has been set and whether or not the refueling operation has been completed (steps S05 and S06). . This forced liquid supply stop includes a state of detecting abnormal mixing of water into the fuel supplied to the fuel supply nozzle 17. The end of the refueling operation is detected by the input of a refueling operation end signal, for example, an input of a detection signal from the nozzle switch 19 based on the return of the refueling nozzle 17 to the nozzle housing 18.

  When detecting the end of the refueling operation, the control device 30 stops the driving of the pump motor 12 and transmits refueling information such as a refueling amount to the POS terminal for the refueling station for issuing a slip (step S08). . If the forced liquid supply stop is set, a warning to that effect is given (step S07), the pump motor 12 is immediately stopped, and the fuel supply from the pump unit 11 toward the fuel supply nozzle 17 is immediately performed. End (step S08). If the flow rate control valve 14 also serves as a safety valve, the flow rate control valve 14 may be closed instead of stopping the drive of the pump motor 12, and further the drive stop of the pump motor 12 may be stopped. And closing the flow rate control valve 14 can be performed together.

  Thus, in the fuel supply apparatus 1 of the present embodiment, when it is detected that water is abnormally mixed in the fuel supplied from the pump unit 11 to the fuel supply nozzle 17 (steps S02 and S05), the detection is performed. The abnormal water mixing state is notified (steps S07 and S08), and the fuel supply from the pump unit 11 toward the fuel supply nozzle 17 is immediately stopped (step S08).

  In addition, in the fuel supply device 1 of the present embodiment, the control device 30 performs water mixing determination processing for determining whether or not water exceeding a predetermined moisture content is mixed in the oil liquid fed to the fuel supply nozzle 17. The mixed water detection process is performed in parallel with the above-described refueling work process.

  FIG. 7 is a flowchart of an embodiment of the water contamination detection process including the water contamination determination process.

  In the water mixing detection process, after the oil supply device 1 is started, the control device 30 initially sets the valve opening degree of the flow control valve 15 to a preset small flow rate state (step S10), and the oil supply nozzle 17 at the time of oil supply work. Regardless of the operating state of the operating lever, the supply flow rate (flow velocity, discharge amount) of fuel supplied from the pump unit 11 to the fuel supply nozzle 17 per unit time is set to a low flow velocity. Here, the low flow rate may be a supply flow rate per unit time including a discharge amount (for example, 40 L / min) in a normal standard discharge type oiling device.

  And the control apparatus 30 is water mixing monitoring timing for monitoring whether the water derived from the outside other than the fuel derived water has mixed in the fuel supplied from the pump unit 11 to the fuel supply nozzle 17. Check if it exists. Here, the fuel-derived water refers to water that is slightly contained in advance in the fuel unloaded from the tank truck to the underground tank, and the externally-derived water is, for example, an underground tank, an underground tank, and a fuel supply device. It refers to water that has entered from the outside due to corrosion, cracks, etc. that occurred in the piping system between the two. This water mixing monitoring timing is set in advance, and in the example shown in the figure, three types of monitoring are performed: a refueling operation start monitoring timing (step S11), a refueling monitoring timing (step S21), and a standby monitoring timing (step S41). Timing is ready.

  The refueling work start monitoring timing (step S11) is for detecting whether or not water is abnormally mixed in the supplied fuel at the start of the refueling work. The refueling monitoring timing (step S21) During the fuel supply at the time of work, it is for detecting whether or not an abnormal mixture of water has occurred in the fuel to be supplied, and the standby monitoring timing (step S41) is in a standby state where the refueling work is not being performed. In addition, it is for detecting whether or not abnormal mixing of water has occurred in the fuel supplied in the next refueling operation. Therefore, when the refueling operation is not performed, it is confirmed whether it is the refueling work start monitoring timing (step S11) or the standby monitoring timing (step S41), and the refueling operation is performed. During the refueling operation after the start, it is confirmed whether it is the monitoring timing during refueling (step S21).

  The control device 30 confirms the refueling work start monitoring timing (step S11), for example, by inputting a detection signal from the nozzle switch 19 based on the removal of the refueling nozzle 17 from the nozzle storage portion 18, and an insertion sensor to the refueling port. The oil supply nozzle 17 provided is monitored based on the input of an insertion detection signal from the insertion sensor, the start of the pump motor 12, or the start of input of a flow rate pulse from the flow rate transmitter 15. Further, the confirmation of the standby monitoring timing (step S41) is monitored based on, for example, the elapse of a predetermined monitoring interval time, the operation input of a monitoring instruction switch (not shown) by the administrator, or the like.

  Then, for example, when it is confirmed that the refueling work start monitoring timing (step S11) is reached, the control device 30 takes in the detection output from the detection circuit 61 attached to the water detector 50 and performs water mixing determination processing. Start (step S13).

  During execution of this water mixing determination process, the valve opening degree of the flow control valve 15 is set to a small flow rate state at the start of operation of the fueling device 1 or at the end of the previous fueling operation (step S10 and will be described later). Step S32), even when the operator fully opens the operation lever of the oil supply nozzle 17 and is hooked on the lever hook to start the oil supply operation with a high discharge amount (for example, 90 L / min). The supply flow rate per unit time of the fuel fed from 11 to the fuel supply nozzle 17 is maintained at a low flow rate (low flow rate).

  Thereby, during the water mixing determination process, even if the fuel in which water derived from the outside is abnormally mixed in the fuel passes through the flow direction conversion unit 55 in the detection flow path 54 of the water detector 50, As shown in FIG. 5, the water clusters w diffused (dispersed) are gathered in the water reservoir portion composed of the lower area on the flow path inner wall surface 55q side and the bent outer area on the flow path inner wall surface 55p side as shown in FIG. It is not difficult to collect. In addition, the amount of water that is clustered and diffused again from the water reservoir into the flow by the fuel having a high flow velocity flowing through the detection channel 54 is extremely small, and the amount of water W that can be stored in the water reservoir during fuel supply is reduced. The amount will not decrease. As a result, the state of the water reservoir in the detection flow path 54 is such that the water derived from the outside is not abnormally mixed in the fuel, and the fuel in which the water derived from the fuel is mixed is the flow direction conversion section 55 of the detection flow path 54. 4, there are few water clusters w attached to the detection electrode 57 as shown in FIG. 4A, and the gap between the detection electrode 57 and the flow path inner wall surface 55 q of the detector housing 51 is small. Is in a state where water W does not enter. On the other hand, when the fuel in which water derived from the outside is abnormally mixed in the fuel passes through the flow direction conversion portion 55 of the detection flow path 54, as shown in FIG. The water cluster w adhering to the detection electrode 57 increases, and the water W enters a state between the detection electrode 57 and the flow path inner wall surface 55q of the detector housing 51. In addition, since the difference in the amount of water stored in the water reservoir is large when only fuel-derived water is stored and when water derived from the outside is also stored, water detection in the detection circuit 61 The accuracy of the threshold is also improved.

  On the other hand, during the water contamination determination process, the operator has not yet opened the operation lever of the oil supply nozzle 17 and the pump motor 12 is driven. When the fuel is relieved between the two and the fuel does not flow through the detection flow path 54 of the water detector 50, the water detector 50 is settled and accumulated in the water reservoir due to the difference in specific gravity with the fuel during standby. In the water mixing determination process at the refueling work start monitoring timing (step S11), whether or not water derived from the outside is abnormally mixed in the fuel from the amount of water W is detected. It will be determined whether or not.

  FIG. 8 is a flowchart showing an embodiment of the water mixing determination process started in step S13 shown in FIG.

  The control device 30 first reads and captures the detection output from the detection circuit 61 attached to the water detector 50 (step S131), and determines whether or not the detection output is a detection signal that exceeds the water detection threshold. To do. If the detection signal exceeds the water detection threshold, the control device 30 determines that water derived from the outside is abnormally mixed in the fuel (step S135). On the other hand, if the detection output is not a detection signal exceeding the water detection threshold, it is determined whether or not a predetermined determination end condition has been satisfied (step S133). As the determination end condition, for example, the execution time of the water mixing determination process, the number of times of detection output fetched from the detection circuit 61, and the like are set in advance. Then, if the determination end condition is satisfied, the control device 30 determines that water derived from the outside is not abnormally mixed in the fuel (step S134). On the other hand, if the determination end condition is not satisfied, the process returns to step S131, a new detection output is read from the detection circuit 61, and the processes in and after step S132 are performed. That is, in this case, the determination end condition in step S133 corresponds to the determination condition that water derived from the outside is not abnormally mixed in the fuel.

  Returning to FIG. 7, when the control device 30 obtains the determination result by the water mixing determination processing in this manner (step S14), the operation of the fuel supply device 1 is performed when the water derived from the outside is not abnormally mixed in the fuel. The low flow rate (low flow rate) setting that is set at the start or at the end of the previous refueling operation is changed to a high flow rate (high flow rate) setting, and the valve opening of the flow control valve 15 is changed to a high flow rate state ( Step S15). As a result, when the operator has fully opened the operating lever of the oil supply nozzle 17 and is hooked on the lever hook, and starts an oil supply operation with a high discharge amount (for example, 90 L / min), the oil supply nozzle 17 The fuel is discharged to the supply target at a high discharge amount.

  During the subsequent refueling operation, the control device 30 checks whether or not the monitoring timing during refueling has come (step S21) and whether or not the current refueling operation has ended (step S31). Here, the monitoring timing during refueling (step S21) can be confirmed, for example, by elapse of a predetermined monitoring interval time from the previous monitoring timing including the refueling work start monitoring timing (step S11) or the monitoring interval refueling amount. Monitoring is performed based on the end of refueling, an operation input of a monitoring instruction switch (not shown) by an administrator, and the like. In addition, confirmation of the end of the current refueling operation (step S21) can be performed by, for example, inputting a detection signal from the nozzle switch 19 based on the return of the refueling nozzle 17 to the nozzle storage unit 18, and stopping the pump motor 12. Alternatively, monitoring is performed based on when the input of the flow rate pulse from the flow rate transmitter 15 is stopped.

  In addition, if the control device 30 confirms that it is the monitoring timing during refueling (step S21), the high flow rate (high flow rate) setting set in the refueling device 1 is set to the low flow rate (low flow rate) setting. The setting of the flow rate control valve 15 is changed to a small flow rate state (step S22). Then, the water mixing determination process shown in steps S23 to S25 is performed in the same manner as steps S13 to S15 described above. In addition, when confirming the end of the current refueling operation (step S31), the control device 30 sets the flow rate setting of the refueling device 1 to a low flow rate (low flow rate) setting in preparation for the start of the next refueling operation. In addition, the opening degree of the flow control valve 15 is changed to a small flow rate state (step S32).

  Therefore, in the fuel supply device 1 of the present embodiment, even when a high discharge amount (for example, 90 L / min) is performed and fuel is discharged from the fuel supply nozzle 17 to the supply target at a high discharge amount. Every time the control device 30 confirms the monitoring timing during refueling (step S21), the control device 30 determines the fuel to be fed from the pump unit 11 toward the refueling nozzle 17 regardless of the fully open operation state of the operation lever of the refueling nozzle 17. By reducing the supply flow rate per unit time and slowing down the flow rate of the fuel flowing through the detection flow path 54, it can be detected with high accuracy and stability that the water derived from the outside is abnormally mixed in the fuel. And if it is confirmed that water derived from the outside is not abnormally mixed in the fuel, the supply flow rate per unit time of the fuel sent from the pump unit 11 toward the fuel supply nozzle 17 is automatically restored. Quick refueling with a high discharge rate can be secured. Furthermore, it becomes possible to share the water detector 50 between the high discharge type oil supply device and the normal standard discharge type oil supply device without preparing a water detector dedicated to the high discharge type oil supply device. It can also contribute to the cost reduction of the high discharge type oiling device.

  In addition, when it is confirmed that the standby monitoring timing (step S41) is reached, the control device 30 detects the amount of water W that has settled and accumulated in the water reservoir due to the difference in specific gravity from the fuel during standby. Thus, in the water mixing determination process (steps S43 and S44) without changing the setting of the supply flow rate per unit time of the fuel sent from the pump unit 11 toward the fuel supply nozzle 17, the amount of the water W is determined. Then, it is determined whether or not water derived from the outside is abnormally mixed in the fuel. In this case, in the water mixing determination process, it is determined that the water derived from the outside is not abnormally mixed in the fuel. Since the water mixing determination process is repeated each time when it is confirmed that the timing (step S41), the detection attached to the water detector 50 is different from the case shown in FIG. When the detection output read out and fetched from the circuit 61 is not a detection signal exceeding the water detection threshold, it can be directly determined as a determination condition as it is.

  In the water mixing determination process of the present embodiment, three types of monitoring are performed as the water mixing monitoring timing: a refueling work start monitoring timing (step S11), a refueling monitoring timing (step S21), and a standby monitoring timing (step S41). Although the timing is prepared, at least the monitoring timing during refueling (step S21) is prepared as the water mixing monitoring timing, and the refueling work start monitoring timing (step S11) and the standby monitoring timing (step S41) may be omitted. This can be handled by appropriately setting the monitoring interval time and the monitoring interval oil supply amount.

  FIG. 9 is a flowchart showing a modification of confirmation of monitoring timing during refueling (step S21) in the water mixing determination process shown in FIG.

  For confirmation of the monitoring timing during refueling in the water mixing determination process shown in FIG. 8 (step S21), the monitoring interval time and the monitoring interval refueling amount are set as shown in steps S211 and S212 shown in FIG. In addition, it is confirmed whether or not the monitoring interval oil supply amount has reached a predetermined value set in advance. The confirmation of the monitoring timing during oil supply (step S21) is performed in step S15 as shown in steps S213 and S214. In the state where the valve opening degree of the flow control valve 15 is changed to a large flow rate state, confirmation of water abnormality mixing is started (step S213), and as a result, water derived from outside is abnormally mixed in the fuel. When the determination is made, it is determined that a water contamination detection preliminary signal has been input (step S214, YES), and after step S22, the valve opening of the flow control valve 15 is set to a small flow rate state. In addition, the water contamination check is performed with higher accuracy. On the other hand, when it is determined that the water derived from the outside is not abnormally mixed in the fuel, it is determined that the water contamination detection preliminary signal is not input ( In step S214, NO), the more accurate water abnormality mixing confirmation shown in steps S22 to S25 is omitted.

  According to this embodiment, it is possible to reduce the number of executions of high-accuracy water abnormality mixing confirmation in which the valve opening degree of the flow control valve 15 is changed to a small flow rate state, and to perform a quick oil supply operation with a high discharge amount. It can be secured.

  FIG. 10 is a schematic configuration diagram of a 1-pump 2-meter type fuel supply device as another embodiment of the fuel supply device according to the present invention.

  In this 1-pump 2-meter type fueling device 1 ', the fuel supply path is branched on the downstream side of the pump unit 11, and the fuel supply nozzles 17 provided at the respective ends of the plurality of branched fuel supply paths are selectively used to separately The oil supply operation can be performed simultaneously on the supply object. A water detector 50 is provided upstream of the pump unit 11. About the detailed structure of this 1 pump 2 meter type oiling apparatus 1 ', the same code | symbol is attached | subjected about the same or similar component as the high discharge type oiling apparatus 1 shown in FIG. Omitted.

  Also in the 1-pump 2-meter type oiling device 1 ′, the control device 30 individually performs the water mixing determination process shown in FIG. 7 for the two oiling systems each consisting of the oiling nozzle 17 and the oiling hose 16. . Therefore, in this embodiment, in steps S15 and S25 shown in FIG. 7, the low flow rate (low flow rate) setting is changed to the high flow rate (high flow rate) setting, and the valve opening degree of the flow control valve 15 is increased. The process for changing to a state is as shown in FIG.

  FIG. 11 is a flowchart showing a modification of the setting change (steps S15 and S25) to a high flow rate (high flow rate) in the water mixing determination process shown in FIG.

  In this embodiment, the state of the other party's lubrication system is read (step S151), if the other party's lubrication system is on standby (step S152, YES), or if the other party's lubrication system is not detecting the presence of water abnormality (step) In cases other than S153, NO), the setting is not changed to the high flow rate (high flow rate) setting (step S154). That is, in the above-described 1-pump 2-meter type oiling device 1 ′, when oiling is performed on one side, the discharge flow rate measured by the flow meter 13 at that time is a low flow rate (on the pump unit 11 side). (Discharge performance is standard) On the other hand, when refueling starts (simultaneous refueling), the flow rate measured by the flow meter 13 to detect the mixing of water is lower than this low flow rate. It becomes.

  Therefore, even in the case of the one-pump, multi-meter type fueling device 1 'as in this embodiment, even when water derived from the outside is abnormally mixed in the fuel, the abnormal mixing of water into the fuel is prevented. It can be detected with high accuracy and stability. In the 1-pump 2-meter type oiling device 1 ′ described above, the water detector 50 is provided on the upstream side of the pump unit 11, but the downstream side of the pump unit 11 (for example, the pump unit 11 and the flow rate). If it is provided between the total 13), the mixing of water is detected based on the flowchart of FIG.

  As described above, the fuel supply apparatuses 1 and 1 ′ as the embodiment of the fuel supply apparatus according to the present invention are configured. However, the embodiment of the fuel supply apparatus according to the present invention is a specific example of the above-described embodiment. The present invention is not limited to the configuration, and various modifications other than this can be adopted. For example, in the above-described embodiment, the supply flow rate (flow velocity) of the fuel flowing through the detection flow path 54 of the water detector 20 is adjusted using the flow control valve 14, but the flow control valve 14 is provided. Instead, the pump motor 12 is driven and controlled, and the discharge amount from the pump unit 11 is changed between a high flow rate (high flow rate) and a low flow rate (low flow rate), and the pump unit 11 is also used as a flow rate adjusting device. It is also possible. Further, the water detector 20 is not limited to a conductive or capacitive sensor configuration, and for example, a float type sensor or the like can be used.

1, 1 'refueling device (fuel supply device), 2 device body,
11 Pump unit (liquid feeding device), 12 Pump motor,
13 flow meter, 14 flow control valve (flow adjustment device),
15 Flow rate transmitter, 16 Lubrication hose, 17 Lubrication nozzle,
18 nozzle housing, 19 nozzle switch, 20 indicator,
30 control device, 41 underground piping, 42 underground tank (liquid storage tank),
49 Piping for position adjustment, 50 Water detector, 51 Detector housing,
51a sensor mounting hole, 51i inflow side housing,
51o Outflow side casing, 52 Inlet, 53 Outlet,
54 detection flow path, 55 flow direction conversion part, 55p flow path inner wall surface,
55q channel inner wall surface, 56 sensor body, 57 detection electrode,
58 ground electrode, 59 insulation, 60 water detection sensor,
61 detection circuit, 62 power supply / barrier

Claims (5)

A fuel supply path for supplying fuel from a liquid storage tank to a supply target;
A liquid-feeding device that is provided in the fuel supply path and that feeds the fuel in the liquid storage tank toward the nozzle at the tip of the fuel supply path;
The amount of water mixed in the fuel that is provided in the fuel supply path and is supplied to the supply target via the fuel supply path is determined by the flow path bending portion or the flow path in the middle of the detection flow path through which the fuel flows. A water detector for detecting by a sensor provided in the curved portion;
A fuel supply comprising a water mixing detection unit that detects whether or not water is mixed in the fuel supplied to the supply target via the fuel supply path based on the detection output of the water detector A device,
A flow rate adjusting device that is provided in the fuel supply path and adjusts the supply flow rate of fuel fed from the liquid storage tank toward the nozzle;
Prior to detecting whether or not water is mixed in the fuel supplied to the supply target by the water mixing detection unit, the supply flow rate of the fuel fed from the liquid storage tank toward the nozzle A fuel supply device comprising: a flow rate adjustment control unit that controls the flow rate adjusting device so that the flow rate is temporarily lower than a normal supply flow rate. The water contamination detection unit
Corresponding to whether or not the detection output of the water detector satisfies a preset mixing determination condition, whether or not water is mixed in the fuel supplied to the supply target through the fuel supply path A mixing determination unit for determining
Whether the detection by the mixing determination unit is performed in response to whether the detection output of the water detector is looser than the mixing determination condition of the mixing determination unit and satisfies a preset preliminary determination condition. A preliminary discrimination unit to be determined;
Including
When the preliminary determination unit determines that the mixing determination unit performs the determination, the flow rate adjustment control unit supplies liquid from the storage tank toward the nozzle prior to the determination by the mixing determination unit. 2. The fuel supply device according to claim 1, wherein the operation of the flow rate adjusting device is controlled so that a supplied flow rate of the fuel is temporarily lower than a normal supply flow rate. 3. When the water mixing detection unit detects that there is no water mixing in the fuel supplied to the supply target, the flow rate adjustment control unit sends the liquid from the liquid storage tank toward the nozzle. The fuel supply device according to claim 1 or 2, wherein the operation of the flow rate adjusting device is controlled so as to return the supplied flow rate of the fuel to the normal supply flow rate. When the water mixing detection unit detects that water is mixed in the fuel supplied to the supply target, the liquid feeding device and / or the flow rate adjusting device is set in the liquid storage tank from the inside. The fuel supply apparatus according to claim 1, further comprising a liquid supply control unit that stops and / or prohibits the liquid supply of the fuel toward the nozzle. The detection of whether or not water is mixed in the fuel supplied to the supply target by the water mixing detection unit is performed at the start of the fuel supply operation or during the fuel supply to the supply target. The fuel supply device according to claim 1 or 2.

Images