JP2016028969A - Fuel supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel supply device with a water detection mechanism capable of improving work such as an inspection or repair of the water detection mechanism and improving maintainability.SOLUTION: A fuel supply device 1 includes a water detection mechanism 30. A pump as well as a strainer 51 provided in a pump-inlet-side fuel supply passage and a filter 48 provided in a pump-discharge-side fuel supply passage constitutes a pump unit 40 disposed within a same casing 41. The water detection mechanism 30 is provided integrally with a strainer attachment lid 52 which is detachably attached to a strainer attachment opening portion formed to be opened in the casing 41 of the pump unit 40 to insert the strainer 51 into a strainer attachment chamber 44 formed in the casing 41 and disposing the strainer 51 in the strainer attachment chamber 44 so as to close the strainer attachment opening portion.SELECTED DRAWING: Figure 2

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 determines whether or not water is abnormally mixed in the fuel supplied to the supply target. It relates to a supply device.

  As a kind of fuel supply device, a fuel supply device that is installed in a gas station such as a gas station, inserts a cylinder tip of a fuel nozzle into a fuel supply port of a vehicle, etc., and supplies fuel such as gasoline or light oil to the vehicle or the like is known. . When refueling a vehicle or the like, a fueling device supplies fuel pumped up from an underground tank via a fuel supply path such as a fueling pipe, a fueling hose, and a fueling nozzle provided at the tip of the fueling hose. It is configured to be supplied to a certain vehicle or the like.

  In the fuel supply device including such a fuel supply device, a water detection mechanism for detecting the amount of water mixed in the fuel flowing through the fuel supply path is provided, and is mixed into the fuel supplied to the supply target. When there is an abnormality in the amount of water that is present, there is one that notifies that.

  For example, Patent Document 1 discloses a float that has an intermediate specific gravity between water and fuel in a water reservoir provided in a fuel supply path, and is displaced in response to displacement of a boundary surface between water and fuel in the water reservoir. Is provided, and when it is detected that the amount of water stored in the water reservoir exceeds a predetermined amount and the float has risen to a predetermined height position, the water is supplied to the fuel supplied to the supply target. A technique for discriminating that an abnormality has occurred and notifying the fact is shown.

Japanese Utility Model Publication No. 61-38645

  However, in the fuel supply device described in Patent Document 1, when the water detection mechanism having the above-described float or the like is provided, the dedicated fuel oil supply device previously formed on the housing wall portion of the filter device as a constituent member of the fuel supply path. This water detection mechanism is attached to the installation port, and a float or the like is disposed in the water reservoir that communicates with the fuel supply path from the installation port. Therefore, when performing inspections, repairs, etc. of the water detection mechanism, the maintenance worker removes the filter device in which the dedicated installation port of the water detection mechanism is formed on the housing wall part from the fuel supply path, Or it was necessary to take out the float etc. of a water detection mechanism from the exclusive installation port. As a result, when checking or repairing the water detection mechanism, there is a problem that it takes more time than necessary to remove or attach the dedicated installation port.

  The present invention has been made in view of the above-described problems, and provides a fuel supply device equipped with a water detection mechanism that improves workability such as inspection and repair of the water detection mechanism and improves maintenance. For the purpose.

  In order to solve the above-described problems, a fuel supply device according to the present invention is supplied to a supply target through a pump provided in a fuel supply path for supplying fuel from a liquid storage tank to the supply target, and the fuel supply path. A water detection mechanism that detects the degree of water mixing into the fuel, and whether or not there is an abnormal degree of water mixing in the fuel supplied to the supply target based on the water mixing degree detected by the water detection mechanism And a water supply device including a water abnormality mixture detection unit that detects whether or not the pump includes a strainer provided in a fuel supply path on a suction side of the pump and an air provided in a fuel supply path on a discharge side of the pump. It is configured as a pump unit arranged in the same casing together with the separator and the filter, and the water detection mechanism is installed in the strainer mounting chamber formed in the casing of the pump unit. In order to close the strainer mounting opening formed in the casing in order to insert and arrange the trainer, the strainer mounting lid is provided integrally with the strainer mounting lid that is detachably mounted in the strainer mounting opening. Features.

  According to the present invention, since the water detection mechanism is integrally provided on the strainer mounting lid that is detachably mounted on the strainer mounting opening of the pump unit, the strainer mounting lid is connected to the strainer mounting opening. By attaching to and removing from the water detection mechanism, the water detection mechanism can be easily arranged and removed from the fuel supply path, and the maintainability when the water detection mechanism is inspected and repaired is improved.

It is a schematic block diagram of one Example of the fuel 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 a pump unit. It is explanatory drawing of the fuel supply path | route in the pump unit shown in FIG. It is an external view of the side surface of the pump unit in which the strainer mounting opening is formed. It is a structure enlarged view of the strainer attachment chamber part of the pump unit shown in FIG. It is a structure enlarged view of the strainer attachment chamber part in the state which removed the water detection sensor of the water detection mechanism. It is a structure enlarged view of a water detection sensor. It is the figure which showed the modification of the structure of the strainer of a pump unit. It is the figure which showed another modification of the structure of the strainer of a pump unit. It is a structure enlarged view of the strainer attachment chamber part of the pump unit in which the strainer shown in FIG. 9 was installed. It is the figure which showed another modification of the structure of the strainer of a pump unit. It is a block diagram of one Example of the strainer for a detection part protection. FIG. 13 is an assembly diagram of the strainer for protecting the detection unit shown in FIG. 12. It is a structure enlarged view of the strainer attachment chamber part of the pump unit in which the 1st, 2nd strainer shown in FIG. 12 was installed. It is a block diagram of another Example of the strainer for a detection part protection. It is a block diagram of the water mixing detection system containing the water detection mechanism with which the fueling apparatus of the present Example was equipped.

  An embodiment of a fuel supply apparatus according to the present invention is installed in a gas station such as a gas station, and a fuel supply nozzle is inserted into a fuel supply port of a vehicle or the like to supply fuel such as gasoline or light oil to the vehicle or the like. The apparatus will be described as an example.

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

  In the illustrated example, the oil supply device 1 is a ground-installed oil supply device. In the fueling device 1, a pump 11 driven by a pump motor 12 and a flow meter 13 for measuring the amount of fuel discharged from the pump 11 are housed in the fueling device body 2. Is connected to the outflow side of the flow meter 13 through an internal pipe 15 and has a structure in which an oil supply hose 16 having an oil supply nozzle 17 connected to the tip thereof is led out. A suction side of the pump 11 is connected to a liquid in an underground tank 22 for storing a fuel oil liquid via an underground pipe 21.

  In the fueling device 1, the fuel oil pumped up from the underground tank 22 by the pump 11 is supplied to the flow meter 13, and the liquid amount is measured. A flow rate transmitter 14 is attached to the flow meter 13 to output a flow rate pulse proportional to the flow of the fuel oil liquid for each unit flow rate.

  The oil supply nozzle 17 is stored in a nozzle storage portion 18 provided in the oil supply apparatus main body 2 when not used in an oil supply operation. The refueling nozzle 17 is taken out from the nozzle storage portion 18 during refueling work, and a discharge pipe at the tip is inserted into a refueling port of a vehicle or the like, and a built-in on-off valve is opened by operating an operation lever. Supply can be done. The nozzle storage unit 18 is provided with a nozzle switch 19 for detecting the removal and return of the fueling nozzle 17. The oil supply information such as the amount of oil supplied during the oil supply operation is displayed on a display 20 provided with the display surface facing the outside from the oil supply device body 2.

  In the oil supply apparatus main body 2, a control device 23 that controls each part of the oil supply apparatus is provided in addition to devices such as the pump 11 and the flow meter 13. The control device 23 includes a microcomputer device provided with a memory, an input / output interface, and the like. The control device 23 receives a detection signal of the nozzle switch 19 and the like, and controls each part of the fueling device based on these signal inputs.

  Specifically, the control device 23 drives the pump motor 12 by taking out the fuel supply nozzle 17 from the nozzle storage portion 18 based on the detection signal from the nozzle switch 19 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 fuel oil to the oil supply nozzle 17. Further, the control device 23 functions as an oil supply amount calculation display unit that calculates the oil supply amount during the oil supply operation and displays it on the display device 20 based on the input of the flow rate pulse from the flow rate transmitter 14.

  Further, in the fueling apparatus 1, the control device 23 is 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 connected to the POS for the gas station. Based on the reception of the refueling work permission signal and the refueling work prohibition signal supplied from the terminal machine, the operation of each part of the apparatus including the driving of the pump motor 12 based on the operation of the above-described refueling nozzle 17 is permitted or prohibited. When the work is completed, refueling information such as a refueling amount is transmitted to a POS terminal for a gas station for issuing a slip.

  In the fuel supply apparatus 1 according to this embodiment, in addition to the above-described configuration, a water detection mechanism 30 is provided in the middle of the fuel supply path from the underground tank 22 to the fuel supply nozzle 17. The water detection mechanism 30 detects the amount of water mixed in the fuel pumped up from the underground tank 22 by the pump 11 and supplied to the fuel supply nozzle 17, that is, the degree of water mixing.

  And the control apparatus 23 functions also as the water abnormal mixture detection part 38 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 detection mechanism 30. FIG. It is like that. Accordingly, the detection output of the water detection mechanism 30 is input to the control device 23.

  FIG. 16 is a configuration diagram of a water contamination detection system including a water detection mechanism provided in the fueling apparatus of the present embodiment.

  In the illustrated example, the water detection mechanism 30 constitutes a water contamination detection system of the fuel supply device 1 together with the sensor amplifier circuit 36, the power source / barrier 37, and the water abnormality contamination detection unit 38 (control device 23).

  The water detection mechanism 30 has a water detection sensor 32 to be described later, and generates a detection output corresponding to the mixing state of water in the fuel oil. The sensor amplifier circuit 36 drives the water detection sensor 32 and receives the detection output of the water detection sensor 60. The sensor amplifier circuit 36 amplifies the detection output and compares it with a preset threshold value. The presence or absence of water is determined, and a water detection signal based on the determination result is output. The control device 23 side is electrically insulated from the water detection sensor 32 and the sensor amplifier circuit 36 side via a power source / barrier 37, and the power source / barrier 37 supplies circuit power to the sensor amplifier circuit 36. On the other hand, the water detection signal output from the detection circuit 61 is supplied to the water abnormality mixture detection unit 38.

  In addition, the control device 23 as the water abnormality mixture detection unit 38 exceeds a predetermined moisture content in the oil liquid fed to the oil supply nozzle 17 based on the water detection signal supplied from the water detection mechanism 30. When the abnormal water mixing determination process is performed to determine whether or not water is mixed and, as a result, it is determined that there is an abnormal time when water exceeding the predetermined moisture content is mixed in the pumped fuel. Countermeasure processing is performed. Examples of the abnormality countermeasure processing include a notification instruction at the time of abnormality for the display 20, a notification output of occurrence of abnormality to the POS terminal for the gas station, and the like.

  The water detection mechanism 30 is provided in the pump unit 40 in the present embodiment. In the pump unit 40, the pump 11 is disposed in the same casing together with a strainer provided in the fuel supply path on the suction side of the pump 11, an air separator and a filter provided in the fuel supply path on the discharge side of the pump 11. It is configured.

Next, the pump unit 40 provided with the water detection mechanism 30 will be described with reference to FIGS.
FIG. 2 is a schematic configuration diagram schematically showing the configuration of an embodiment of the pump unit.
FIG. 3 is an explanatory diagram of a fuel supply path in the pump unit shown in FIG.

  In FIGS. 2 and 3, in order to show the overall configuration of the pump unit in an easy-to-understand manner, the arrangement relationship between the respective parts in the casing is actually shifted for convenience by shifting the arrangement relationship vertically, front and rear, and right and left. It is shown.

  As shown in FIGS. 2 and 3, the pump unit 40 includes a strainer mounting chamber 44, a check valve mounting chamber 45, and a rotor chamber in the same casing 41 having an inlet 42 and an outlet 43. 46, an air separation chamber 47, and a filter chamber 48 are sequentially arranged from the upstream side to the downstream side of the fuel supply path. In addition, a gas-liquid separation chamber 49 is provided between the air separation chamber 47 and the inflow side of the rotor chamber 46. The structure is arranged to communicate with each other.

  A strainer 51 is accommodated in the strainer mounting chamber 44. The strainer mounting chamber 44 communicates with an inlet 42 that opens at the bottom of the casing 41. The strainer mounting chamber 44 includes a strainer mounting opening 44a machined from the side surface of the casing 41, a strainer receiving portion 44b and a fuel oil liquid inlet 44c formed on the inner wall of the inner wall of the strainer mounting opening 44a, and a strainer. And a fuel oil liquid outlet 44d through which the fuel oil liquid filtered by 51 is led out of the room.

  The strainer 51 is composed of a net member that captures foreign matters (solid foreign matters other than water) contained in the fuel oil liquid flowing in from the inlet 42 via the fuel oil liquid inlet 44c, and is made of a conductive metal net member. It is formed in a hollow cylindrical shape. In the unlikely event that a foreign object such as a metal piece larger than a predetermined size is mixed in the fuel oil, the foreign material flows into the pump 11 or the flow meter 13 together with the fuel oil. In order to prevent this, a fine mesh member having a filtration particle size of, for example, 80 μm is used.

  The strainer 51 is inserted into the room through the strainer mounting opening 44a, one end (insertion side end (cylinder axial direction front end)) is abutted and supported by the strainer receiving portion 44b, and the other end (extraction side end ( The rear end portion in the cylinder axis direction)) is abutted and supported by the strainer mounting lid 52 mounted in the strainer mounting opening 44a. The strainer mounting lid 52 is fastened to the casing 41 so as to liquid-tightly close the strainer mounting opening 44 a of the strainer mounting chamber 44, and holds the strainer 51 in the strainer mounting chamber 44. The fuel oil introduction port 44 c is formed in the strainer 51 in a state where the strainer 51 is held in the strainer mounting chamber 44 so as to open along the axial direction of the strainer 51. The fuel oil sucked from the inlet 42 by driving the pump 11 is introduced into the cylinder of the strainer 51 along the axial direction of the strainer 51 from the fuel oil inlet 44c.

  In the illustrated example, the other end (extraction side end) of the strainer 51 is fitted to the indoor side surface of the strainer mounting lid 52. Therefore, the strainer 51 is fixed to the strainer mounting lid 52, and when the strainer mounting lid 52 is removed from the strainer mounting opening 44 a of the strainer mounting chamber 44, the strainer 51 is attached together with the strainer mounting lid 52. It can be taken out. In addition, when the strainer mounting lid 52 is mounted on the strainer mounting opening 44a of the strainer mounting chamber 44, the strainer mounting lid 52 and the strainer 51 can be mounted together with the strainer mounting chamber 44, thereby improving maintainability. To do.

  The fuel oil sucked from the inlet 42 by driving the pump 11 is filtered by the strainer 51, and then connected to the communication passage 53 through the fuel oil outlet 44 d formed in the cylindrical wall of the strainer 51. To the check valve mounting chamber 45 after passing through the communication passage 53.

  The check valve mounting chamber 45 is provided on the downstream side of the strainer mounting chamber 44 and is formed adjacent to the strainer mounting chamber 44 in the casing 41. The two chambers 44 and 45 communicate with each other through a communication path 53.

  The check valve mounting chamber 45 includes a check valve mounting opening 45a machined on the side surface of the casing 41, a valve seat 45b opened and closed by the inflow side check valve 54, and a communication opening through which fuel oil flows. Part 45c, and an outflow opening 45d through which the fuel oil that has passed through inflow check valve 54 flows out.

  The check valve mounting opening 45a is provided on the same side surface of the casing 41 together with the strainer mounting opening 44a. An inflow check valve 54 is attached to the check valve mounting chamber 45 so as to be capable of opening and closing. A valve seat 45 b is provided in the communication opening 45 c communicated with the communication passage 53. The fuel oil liquid that has passed through the inflow side check valve 54 flows out through the outflow opening 45d into the suction side flow path 57 that communicates with the rotor chamber 46 in which the gear pump 61 is provided.

  The inflow check valve 54 is urged in the direction to close the communication opening 45c by being seated on the valve seat 45b by the spring force of the coil spring 55, and is caused by the pump suction pressure (negative pressure) when the pump is driven. The communication opening 45c is opened, and when the pump stops, the communication opening 45c is closed when the pump suction pressure is lost. The coil spring 55 is held by a check valve mounting lid 56 that closes the check valve mounting opening 45a.

  The inflow side check valve 54 operates to a valve opening position or a valve closing position that opens or closes the communication opening 45 c in accordance with a change in negative pressure caused by driving or stopping the pump 11. When the inflow check valve 54 is opened, the communication opening 45c is opened, and the fuel oil in the communication passage 53 flows into the check valve mounting chamber 45 from the communication opening 45c, and flows out. It flows out to the suction side flow path 57 through the part 45d.

  Here, since the strainer mounting chamber 44 and the check valve mounting chamber 45 have separate chamber structures provided with openings 44a and 45a, the strainer mounting lid 52 is removed when the strainer 51 is maintained. Can be taken out integrally with the strainer mounting lid 52, and the check valve mounting lid 56 can be left in the covered state. Therefore, when the strainer 51 is replaced or cleaned, the inflow side check valve 54 disposed in the check valve mounting chamber 45 is in a closed state, so that it is stagnant downstream of the valve seat 45b. The fuel oil liquid is prevented from flowing out.

  When removing the strainer mounting lid 52 during the maintenance of the strainer 51, the drain bolt (not shown) provided in advance at the bottom of the casing 41 (that is, upstream of the communication opening 45c) is removed. Although the fuel oil liquid in the mounting chamber 44 is extracted, since the inflow of the fuel oil liquid downstream of the communication opening 45c into the strainer mounting chamber 44 is blocked by the inflow side check valve 54, By removing the drain bolt, the amount of the fuel oil flowing out from the inside of the strainer mounting chamber 44 is small, and accordingly, the risk of contaminating the surroundings by the liquid discharged from the inside of the strainer mounting chamber 44 is reduced.

  Further, during the maintenance of the strainer 51, it is not necessary to remove the check valve mounting lid 56 of the check valve mounting chamber 45. Therefore, the strainer 51 accumulates in the rotor chamber 46 and the air separation chamber 48 on the downstream side of the rotor chamber 46. This eliminates the need to drain the fuel oil, and maintenance time is reduced accordingly.

  On the downstream side of the check valve mounting chamber 45, a rotor chamber 46 is provided in which a suction-side flow path 57 that communicates with the outflow opening 45d of the check valve mounting chamber 45 communicates. The rotor chamber 46 is provided with a gear pump 61 as the pump 11. The gear pump 61 includes a rotor 62 that rotates by receiving the rotational driving force of the pump motor 12, and a pinion 63 that is rotationally driven by the rotor 62.

  The rotor 62 is formed in a disk shape having an outer diameter corresponding to the inner diameter of the rotor chamber 46, and a semicircular engaging portion 62a is formed at a predetermined pitch (circumferential direction) on the peripheral edge of the disk surface. A plurality of intervals). On the other hand, the pinion 63 is rotatably supported by a rotating shaft 64, and a plurality of semicircular concave portions 63a corresponding to the engaging portions 62a of the rotor 62 are provided on the outer periphery at a predetermined pitch (interval). It has been.

  The rotation center of the rotor 62 and the axis of the rotation shaft 64 that is the rotation center of the pinion 63 are eccentric along the inner diameter direction of the rotor chamber 46. In a gap between the outer periphery of the pinion 63 and the inner periphery of the rotor 62 formed by an inscribed circle of each engaging portion 62a, a crescent-shaped partition portion 65 corresponding to the amount of eccentricity of the rotation center is provided. The inner peripheral surface of the partition portion 65 is a pinion sliding contact surface 65a in which the outer periphery of the pinion 63 is in sliding contact, and the outer peripheral surface of the partition portion 65 is a rotor sliding contact surface 65b in which the engaging portion 62a of the rotor 62 is in sliding contact.

  Since the engaging portion 62a of the rotor 62 is engaged with the concave portion 63a of the pinion 63, when the rotor 62 is rotationally driven by the motor, the pinion 63 is also rotationally driven in the same direction. When the negative pressure is generated on the suction port 46a side of the rotor chamber 46 based on the rotation of the rotor 62 and the pinion 63, the inflow side check valve 54 is opened, and the fuel oil that has passed through the strainer 51 is transferred to the rotor chamber. 46 is sucked into the suction port 46a.

  In the gear pump 61, the rotor 62 and the pinion 63 are rotated in the counterclockwise direction in the drawing, and the fuel oil sucked from the suction side flow path 57 is in the recess 63a of the pinion 63 and the engaging portion of the rotor 62. The gas flows into the gap between 50 a and is discharged to the discharge side flow channel 66 communicated with the discharge port 46 b of the rotor chamber 46.

  The fuel oil liquid discharged from the gear pump 61 is communicated via the discharge side flow channel 66 and flows into the air separation chamber 47 disposed further downstream of the fuel supply path.

  The air separation chamber 47 has a chamber structure capable of separating the inflowing fuel oil liquid into a gas-enriched liquid containing gas and a supplied fuel oil liquid containing only less than an allowable amount of gas by using centrifugal force and gravity. It has become. Accordingly, the gas enriched liquid outflow for collecting the separated gas enriched liquid in the gas liquid separating chamber 49 is collected on the upper chamber wall in the air separation chamber 47 where the separated gas enriched liquid easily collects. A hole 71 is provided. The gas-enriched liquid outflow hole 71 communicates between the upper part in the air separation chamber 48 where the gas-enriched liquid is collected and the gas-liquid separation chamber 49.

  On the other hand, the separated supply fuel oil fluid communicates with the lower part in the air separation chamber 48 where the supply fuel oil fluid collects, flows into the filter chamber 48 provided with the filter 72, and foreign matter is filtered by the filter 72. After that, the gas is discharged to an outflow path 74 connected to the outlet 43 of the casing 41. Here, as in the case of the strainer mounting chamber 44, the filter chamber 48 has a filter mounting opening 48a processed from the side surface of the casing 41, and the filter 72 is arranged in the filter chamber from the filter mounting opening 48a. Established. In the illustrated example, the filter 72 is constituted by a cylindrical filter, and its cylindrical outer peripheral surface is exposed in the filter chamber, and the axial end where the in-cylinder opening is formed faces the filter mounting opening 48a. The filter receiving portion 48b and the fuel oil outlet port 48d formed in the inner chamber wall are arranged in the filter chamber. The filter mounting lid 73 is fastened to the casing 41 so as to close the filter mounting opening 48 a of the filter chamber 48 and holds the filter 72 in the filter chamber 48. The fuel oil liquid flowing in from the fuel introduction oil liquid port 48 c of the filter chamber 48 can flow out from the fuel oil liquid outlet 48 d to the outflow path 74 via the filter 72.

  The outlet 43 of the casing 41 is connected in communication with the inlet of the flow meter 13, and the flow meter 13 can be supplied only with the supplied fuel oil liquid containing only a gas less than the allowable amount. In addition, in the illustrated example, the outflow path 74 is provided with an outflow check valve 75 that is opened by the pressure of the fuel oil sent out by the gear pump 61. The outflow check valve 75 prevents the supply fuel oil from returning from the flow meter 13 side to the pump unit 40 side.

  The gas-liquid separation chamber 49 separates the gas from the gas-enriched liquid that has flowed from the air separation chamber 48 through the gas-enriched liquid outflow hole 71. A return hole 76 for returning the fuel oil liquid to the suction port 46a side of the rotor chamber 46 of the gear pump 61 is provided at the bottom of the gas-liquid separation chamber 49, and the separated gas is supplied to the ceiling of the gas-liquid separation chamber 49. An air opening hole 77 is provided for discharging to the outside.

  The gas-liquid separation chamber 49 is provided with a float valve 78 that responds to the level of the fuel oil liquid containing the gas-enriched liquid in the gas-liquid separation chamber 49. The float valve 78 is a valve part that opens the return hole 76 when the liquid level of the fuel oil liquid containing the gas-enriched liquid remaining in the gas-liquid separation chamber 49 exceeds a predetermined height. Have The gas-liquid separation chamber 49 has a float valve mounting opening 49a machined from the side surface of the casing 41, and the float valve 78 is disposed in the room from the float valve mounting opening 49a. The float valve mounting lid 79 is fastened to the casing 41 so as to close the float valve mounting opening 49 a of the gas-liquid separation chamber 49.

  In the gas-liquid separation chamber 49, the bubbles (gas) contained in the gas-enriched liquid rise to the upper space above the liquid level and are discharged from the atmosphere opening hole 77 into the atmosphere. Further, the fuel oil liquid from which the bubbles have been separated passes through the return hole 76 by the opening of the float valve 78 and returns to the suction side flow path 57 when the liquid level reaches a predetermined height.

  The casing 41 is provided with a relief passage 81 that communicates between the outflow side of the filter chamber 48 and the suction port 46 a side of the rotor chamber 46, and a relief valve 82 is provided in the relief passage 81.

  When the fluid pressure of the fuel oil liquid in the fuel supply path on the downstream side of the pump 11, that is, the pump unit 40 increases more than necessary, a part or all of the fuel oil liquid newly filtered by the filter 72 is a relief valve. 82 is opened and returned to the suction port 46 a side of the rotor chamber 46 of the gear pump 61. The relief valve 82 is urged in the valve closing direction by the spring force of the coil spring 83, and corresponds to the difference between the hydraulic pressure of the outflow passage 74 and the resultant force obtained by adding the suction pressure of the rotor chamber 46 to the spring force of the coil spring 83. Open and close. While the gear pump 61 is being driven, the relief valve 82 repeats opening and closing by balancing the resultant force of the spring force of the coil spring 83, the discharge pressure, and the suction pressure.

FIG. 4 is an external view of the side surface of the pump unit in which the strainer mounting opening is formed.
In the illustrated example, a check valve mounting opening 45a is provided on the side surface of the pump unit 40 in which the strainer mounting opening 44a is formed, together with a strainer mounting lid 52 covered with the strainer mounting opening 44a. A lid 56 for mounting the check valve, a cover for mounting the gear pump 67 on the rotor chamber 46 not shown and described in FIG. 2, and a filter mounting opening 48a for the filter chamber 48 are provided. The filter mounting lid 73 is provided with a relief valve mounting lid 84 that is provided with a relief valve mounting opening of the relief passage 81 (not shown and described in FIG. 2). .

  In the case of the present embodiment, as shown in FIGS. 2 and 3, the strainer mounting lid 52 that covers the strainer mounting opening 44a has a water detection sensor of the water detection mechanism 30 shown in FIG. 32 is detachably attached. Next, a more specific configuration of the water detection mechanism 30 will be described with reference to FIGS.

  FIG. 5 is an enlarged configuration view of a strainer mounting chamber portion of the pump unit shown in FIG. FIG. 6 is an enlarged view of the configuration of the strainer mounting chamber portion with the water detection sensor of the water detection mechanism removed. FIG. 7 is a configuration enlarged view of the water detection sensor.

  The water detection mechanism 30 includes a water detection sensor 32 and a water reservoir 31 in a strainer mounting chamber 44 in which the water detection sensor 32 is disposed.

  In the case of the illustrated water detection mechanism 30, the water detection sensor 32 is disposed in the strainer mounting chamber 44 closer to the strainer mounting opening 44 a side than the fuel oil outlet port 44 d in the axial direction of the cylindrical strainer 51. A strainer mounting chamber opening side portion 44e is formed. In this case, the fuel oil liquid flows into the cylinder of the strainer 51 along the axial direction of the strainer 51 from the fuel oil liquid inlet 44 c at the back of the strainer mounting chamber 44, passes through the strainer 51, and is filtered. The fuel oil liquid outlet 44d formed on the side wall of the strainer mounting chamber flows out. In addition, as shown in FIG. 5, the fuel oil liquid outlet 44 d is provided at a predetermined distance from the side of the strainer mounting opening 44 a in the axial direction of the cylindrical strainer 51, so that the strainer mounting chamber 44. The strainer mounting chamber opening side portion 44e in FIG. 5 flows into the strainer mounting chamber back side portion 44f closer to the back side between the fuel oil liquid inlet 44c and the fuel oil outlet 44d. The water reservoir 31 protrudes in the direction.

  On the other hand, as shown in FIG. 7, the water detection sensor 32 includes a sensor main body 33 and a water detection sensor mounting tool 34 for fixing and supporting the sensor main body 33 and mounting it on the strainer mounting lid 52. Has been. The sensor body 33 is coaxially integrated along the axial direction with a cylindrical electrode 33a for detection and a cylindrical electrode 33b for grounding having a cylindrical insulating member 33c of the same diameter interposed therebetween. They are arranged side by side.

  When the sensor body 33 is immersed in the fuel oil liquid, the water detection sensor 32 has conductivity according to the contact state of the water dispersed and mixed in the fuel oil liquid. If the water does not have conductivity, the fuel is based on the change in the capacitance value between the electrodes 33a and 33b. It is configured to detect water mixed in the oil liquid. The detection output of the change in resistance value and / or capacitance value between the electrodes 33a and 33b is input to a sensor amplifier circuit 36 (not shown in FIG. 1), and the sensor amplifier circuit 36 outputs the detection output. By amplifying and comparing with a preset threshold value, the presence or absence of water in the fuel oil is determined, and a water detection signal based on the determination result is generated. The water detection signal is output and supplied from the sensor amplifier circuit 36 to the control device 23 via a power source / barrier 37 (not shown in FIG. 1) provided in the fuel supply device body 2.

  The water detection sensor mounting tool 34 is composed of a conductive metal member on the sensor mounting side, and is electrically connected to the grounding cylindrical electrode 33 b of the sensor body 33. As shown in FIG. 7, the water detection sensor mounting tool 34 is threaded on the outer peripheral surface on the exposed side of the sensor body 33 for mounting in a sensor mounting screw hole 52 a formed in the strainer mounting lid 52. A mounting portion 34a is formed. In the illustrated example, when the water detection sensor mounting tool 34 is mounted in the sensor mounting screw hole 52 formed in the strainer mounting lid 52, in order to prevent leakage of fuel oil from the gap formed therebetween. The mounting portion 34a is mounted by winding a sealing tape. Therefore, there is a possibility that electrical continuity cannot be obtained between the water detection sensor attachment 34 that is electrically connected to the grounding cylindrical electrode 33b and the strainer attachment lid 52 that is the attachment destination. Therefore, the water detection sensor mounting tool 34 has one end side of the metal coil spring 35a in contact with and supported by a step formed on the outer periphery of the water detection sensor mounting tool 34, and the other end side made of a conductive member. A conductive tool 35 configured to be supported by the plate 35b is provided. The conductive tool 35 has a contact plate 35b that can be displaced along the axial direction of the mounting portion 34a, the coil spring 35a is in a free state, and the contact plate 35b has a substantially intermediate length along the axial direction of the mounting portion 34a. It is designed to be in the position.

  In the state where the water detection sensor 32 is attached to the strainer attachment lid 52, the liquid tightness of the attachment portion 34 a is maintained, and the water detection sensor 32 is attached and fixed to the grounding cylindrical electrode 33 b and the strainer attachment lid 52. The electrical connection with the strainer 51 can be reliably ensured even when the sealing tape is wound around the mounting portion 34a by the contact plate 35b of the conductor 35 coming into contact with the strainer mounting lid 52. It has become. As a result, the entire strainer 51 can be used as the ground electrode of the water detection sensor 32. Further, a flat portion 34 b for holding the water detection sensor mounting tool 34 with a jig such as a wrench is also formed on the outer peripheral surface of the water detection sensor mounting tool 34.

  On the other hand, as shown in FIG. 6, the water detection sensor 32 is attached and fixed to the strainer attachment lid 52, and the detection cylindrical electrode 33 a of the sensor body 33 is connected to the strainer attachment chamber opening side portion in the strainer attachment chamber 44. A sensor mounting screw hole 52a for disposing at 44e and a strainer mounting screw hole 52b for mounting and fixing the strainer 51 to the strainer mounting lid 52 are formed. In the illustrated example, the sensor mounting screw hole 52a is formed as a stepped hole having a large diameter portion and a small diameter portion, and is formed on the outer surface of the water detection sensor mounting tool 34 in the water detection sensor 32 on the inner surface of the small diameter portion. A threaded portion 52a1 into which the mounted portion 34a is screwed is cut, and a large diameter portion is a sensor insertion hole 52a2 into which the sensor body 33 of the water detection sensor 32 is loosely fitted. Yes.

  In addition, an attachment plate 58 for attaching and fixing the strainer 51 to the strainer attachment lid 52 is integrally attached and fixed in advance to the opening on one end side in the axial direction of the cylindrical strainer 51. . Similarly, an annular contact frame portion 51f is integrally provided at the opening on the other end side in the axial direction of the strainer 51, and is in contact with and supported by the strainer receiving portion 44b on the inner wall of the strainer mounting chamber 44. In doing so, the rigidity of the other end of the strainer 51 in the axial direction is improved. In the example shown in the drawing, the contact frame portion 51f has an inner peripheral surface that expands in a taper shape from the back side to the open side along the axial direction thereof.

  On the other hand, the mounting plate 58 is mounted and fixed to the strainer mounting lid 52, and a fixing screw insertion hole 58b through which a fixing screw 58a for mounting and fixing the strainer 51 to the strainer mounting lid 52 is inserted. A sensor main body insertion hole 58c through which the sensor main body 33 of the water detection sensor 32 is inserted is formed.

  The sensor mounting screw hole 52a of the strainer mounting lid 52, the fixing screw insertion hole 58b of the mounting plate 58 of the strainer 51, and the sensor body insertion hole 58c constitute a water detection mechanism holding portion. In the state in which the strainer mounting lid 52 is fastened to the casing 41, the strainer 51 and the sensor main body 33 of the water detection sensor 32 are appropriately arranged in a predetermined height direction position and a predetermined horizontal position in the strainer mounting chamber 44. Thus, the strainer mounting lid 52 and the mounting plate 58 of the strainer 51 are formed.

  The sensor body insertion hole 58c of the mounting plate 58 of the strainer 51 is provided with an annular sensor body holding member 59 formed of an elastic member having conductivity and corrosion resistance against fuel oil. The sensor main body holding member 59 is fixed to the sensor main body insertion hole 58c by fitting an attachment groove formed along the circumferential row on the outer peripheral surface to the opening edge of the sensor main body insertion hole 58c. The diameter of the inner peripheral surface of the sensor main body holding member 59 (the inner diameter of the sensor main body holding member 59) is large enough to be in close contact with the outer periphery of the grounding cylindrical electrode 33b in the sensor main body 33 of the water detection sensor 32. .

  As a result, the fixing screw 58a is inserted into the fixing screw insertion hole 58b of the mounting plate 58, and is attached to the strainer mounting screw hole 52b of the strainer mounting lid 52 and tightened as appropriate, whereby the strainer 51 and the strainer mounting lid. 52 is integrally fixed. At that time, if the axial alignment of the sensor main body insertion hole 58c in the mounting plate 58 of the strainer 51 and the sensor mounting screw hole 52a of the strainer mounting lid 52 is performed, the strainer mounting lid 52 is fastened to the casing. In this state, the cylinder of the strainer 51 is adapted to be arranged at a predetermined height direction position and a predetermined horizontal direction position in the strainer mounting chamber 44, and the water detection sensor 32 also has a detection cylindrical electrode 33a of the sensor body 33. It comes to be arranged in the cylinder of the strainer 51. As a result, the arrangement position of the sensor body 33 is a predetermined position of a circular cross section along the radial direction of the strainer 51, and a predetermined height direction and a predetermined horizontal position in the strainer mounting chamber 44. In that case, since the specific gravity of water is large with respect to the fuel oil liquid, the water mixed in the fuel oil liquid in the form of water bubbles is easily brought into contact with the sensor body 33 of the water detection sensor 32. The position of the water detection sensor 32 is preferably arranged at the corner on the strainer mounting chamber opening side of the strainer mounting chamber opening side portion 44e in the strainer 51 whose height position is closer to the lower side.

  Further, in the case of this embodiment, the grounding cylindrical electrode 33b of the sensor body 33 of the water detection sensor 32 is connected to the strainer mounting lid 52 in which the strainer 51 is integrated. Since the electrical connection between 33b and the strainer 51 is ensured by the sensor main body holding member 59, the water detection sensor 32 can use the entire strainer as a ground electrode and is dispersed in the form of water bubbles in the fuel oil. A slight change in mixed water can be detected by a large change in resistance value or capacitance value.

  According to the present embodiment, the water detection mechanism 30 is integrally provided on the strainer mounting lid 52 that is detachably mounted on the strainer mounting opening 44a of the pump unit 40, whereby the strainer mounting. By attaching and removing the lid 52 to the strainer attachment opening 44a, the water detection mechanism 30 can be easily positioned and removed with respect to the fuel supply path, and the water detection mechanism can be easily inspected. Maintenance is improved when repairing.

  Further, since the strainer 51 and the water detection mechanism 30 are fixed to the strainer mounting lid 52, the worker attaches the strainer mounting lid 52 to the strainer mounting opening 44a of the strainer mounting chamber 44, or the strainer mounting opening. By removing the strainer attachment lid 52 from the portion 44a, both the strainer 51 and the water detection mechanism 30 can be attached to the strainer attachment chamber 44 or easily removed from the strainer attachment chamber 44. The time is shortened compared with attaching and removing each individually, and maintenance is improved. For example, the maintenance of the water detection mechanism 30 can be performed simultaneously with the maintenance of the strainer 51. In addition, when the strainer mounting lid 52 to which the strainer 51 and the water detection mechanism 30 are fixed is attached to the strainer mounting opening 44a, the sensor body 33 of the water detection sensor 32 is built in the strainer 51. That protection can also be achieved.

  In addition, since the sensor body 33 is inserted into the sensor body insertion hole 58c of the strainer attachment lid 52 and the water detection sensor 32 is attached to the strainer attachment lid 52, the water detection mechanism 30 can be disposed in the fuel supply path. In the state where the strainer attaching lid 52 is attached to the casing 41, only the water detection sensor 32 including the sensor main body 33 is removed from the strainer attaching lid 52, or the strainer attaching lid 52 includes the water containing the sensor main body 33. Only the detection sensor 32 can be attached, and maintainability when only the maintenance for the water detection sensor 32 is performed is also improved.

  Further, even when the water detection sensor 32 is attached to the strainer attachment lid 52, that is, the casing 41 of the pump unit 40 in a state where the strainer attachment lid 52 is attached and fixed to the strainer attachment opening 44 a, the arrangement is not limited. The position can be easily arranged at a predetermined position of a circular cross section along the radial direction of the strainer 51 and at a predetermined height direction and a predetermined horizontal position in the strainer mounting chamber 44.

  Furthermore, in the case of the illustrated water detection mechanism 30, the water reservoir 31 is closer to the strainer mounting opening 44a side than the fuel oil outlet port 44d in the strainer mounting chamber 44 with respect to the axial direction of the cylindrical strainer 51. This corresponds to the strainer mounting chamber opening side portion 44e where the cylindrical strainer portion is arranged. In the example shown in the drawing, the fuel oil liquid flows into the cylinder of the strainer 51 along the axial direction of the strainer 51 from the fuel oil liquid inlet 44 c that opens along the axial direction of the strainer 51 at the back. After passing through and filtered, the fuel oil liquid outlet 44d formed in the chamber wall of the strainer 51 in the cylindrical radial direction flows out. In addition, the fuel oil outlet 44d is provided at a distance from the strainer mounting opening 44a side in the axial direction of the cylindrical strainer 51.

  As a result, the strainer mounting chamber opening side portion 44e as the water reservoir 31 in the strainer mounting chamber 44 has a strainer mounting chamber inner part closer to the inner side between the fuel oil liquid introduction port 44c and the fuel oil liquid outlet port 44d. Since it protrudes from the side portion 44f, the fuel oil liquid flowing into the strainer attachment chamber opening side portion 44e from the fuel oil introduction port 44c is blocked by the inner side surface of the strainer attachment lid 52 in the traveling direction. The flow direction is changed in the radial direction perpendicular to the axial direction, and this time, the traveling direction is blocked by the inner peripheral surface of the strainer 51 and the inner peripheral surface of the strainer mounting chamber 44 of the strainer mounting chamber back side portion 44f. While circulating in the mounting chamber opening side portion 44e, it flows out to the strainer mounting chamber back side portion 44f side, that is, out of the water reservoir 31. Due to the recirculation in the water reservoir 31, the water dispersed and mixed into the fuel oil flowing into the water reservoir 31 from the fuel oil introduction port 44 c in the form of water bubbles is caused by the specific gravity of the circulating fuel oil. What flows outside will increase relatively. Then, the water mixed in the flow of the circulating fuel oil liquid gathers and accumulates in the strainer 51 and the corner on the strainer mounting chamber opening side of the strainer mounting chamber opening side portion 44e. A part of the remaining water is dispersed and mixed in the flow of the recirculating fuel oil.

  As a result, the water detection sensor 32 is also exposed to the circulating fuel flow, thereby increasing the contact condition of water contained in the fuel oil and the amount of water to which the water detection sensor 32 is exposed. Even when fuel oil flow is occurring in the fuel supply path during refueling work, if water is abnormally mixed in the fuel oil liquid, fuel flow will occur. Can be detected accurately and quickly.

  Below, the modification which concerns on the structure of the strainer 51 etc. in the pump unit 40 is demonstrated, referring FIG. 8, FIG. In the description, redundant description of the same or similar configuration as the fuel supply device according to the above-described embodiment will be omitted.

FIG. 8 is a view showing a modification of the strainer configuration of the pump unit.
In the strainer 51 shown in FIG. 8, the strainer 51 is disposed in parallel with the sensor body 33 in the cylindrical shape of the strainer 51 located below the sensor body 33 of the water detection sensor 32 and between the inner peripheral surface of the strainer 51. A stagnation plate 85 extending along the axial direction is arranged. The staying plate 85 may be meshed or flat.

  According to the present embodiment, when the mesh size of the strainer 51 is difficult to retain water mixed in the flow of the fuel oil liquid, or when the strainer 51 has a large diameter, the strainer 51 is stagnant on the inner peripheral surface of the strainer 51. When the accumulated water hardly comes into contact with the sensor main body 33, the stagnation plate 85 is disposed below the sensor main body 33 and appropriately separated from the lower surface of the sensor main body 33. Therefore, the mesh size of the strainer 51 is large. The water can be accurately detected without being affected by the diameter of the sheath strainer 51.

FIG. 9 is a view showing another modification of the strainer configuration of the pump unit.
In the strainer 51 shown in FIG. 9, the strainer 51 has a double cylindrical structure composed of an outer cylindrical portion 51o and an inner cylindrical portion 51i that are coaxial with each other, and the water is placed between the outer strainer cylindrical portion 51o and the inner strainer cylindrical portion 51i. A configuration in which a sensor main body 33 of the detection sensor 32 is provided and solid foreign substances such as dust are blocked by the inner strainer cylinder portion 51i of the strainer 51, thereby preventing an object other than water from coming into contact with the sensor main body 33 and performing an erroneous detection operation. It has become.

  In this case, a sensor for detecting stagnant solid foreign matter is also provided in the inner strainer tube portion 51i of the strainer 51, so that not only water is detected but also solid foreign matter such as dust is more than a predetermined amount in the strainer 51. It is also possible to adopt a configuration in which this is detected when accumulated and the maintenance time of the strainer 51 is notified. In this case, as the solid foreign matter detection sensor, the same electrostatic detection sensor or resistance detection sensor as in the case of the water detection sensor 32 can be used.

  In the present embodiment, the strainer 51 has a double cylindrical structure of the outer cylindrical portion 51o and the inner cylindrical portion 51i that are coaxial with each other, so that the water between the outer strainer cylindrical portion 51o and the inner strainer cylindrical portion 51i can be reduced. Although foreign substances other than water intrude into the housing space of the sensor body 33 of the detection sensor 32 so as not to contact the sensor body 33, the filtration particle sizes of the outer strainer cylinder part 51o and the inner strainer cylinder part 51i at that time are as follows. These may be the same or different from each other.

  FIG. 10 is an enlarged configuration diagram of the strainer mounting chamber portion of the pump unit in which the strainer shown in FIG. 9 is installed. In the description, the same or similar components as those in the fuel supply device according to the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the illustrated example, the filtration particle sizes of the outer strainer tube portion 51o and the inner strainer tube portion 51i are relatively coarser than the filtration particle size of the outer strainer tube portion 51o. Specifically, in order to guarantee the accuracy of the pump 11 and the flow meter 13, for example, a fine mesh member having a filtration particle size of 80 μm is used for the outer strainer cylinder portion 51 o. On the other hand, in the inner strainer cylinder portion 51i, conductive solid foreign substances such as metal powder (metal sludge) mixed in the fuel oil liquid flowing in from the inlet 42 are detected by the detection cylindrical electrode 33a of the water detection sensor 32 or the like. It is only necessary to prevent adhesion to the grounding cylindrical electrode 33b and prevent erroneous detection. For example, a net member having a filtration particle size of 300 μm and a relatively coarser filtration particle size than the outer strainer tube portion 51o is used. Yes.

  As a result, as shown in FIG. 10, even when the pump unit 40 is installed in the strainer mounting chamber 44, a solid foreign substance having a high capacitance value comes into contact with the detection cylindrical electrode 33a. It is possible to prevent a solid foreign matter having a size larger than the distance between the electrode 33a and the outer strainer tube portion 51o from causing a short circuit between the detection cylindrical electrode 33a and the outer strainer tube portion 51o. . In addition, the mesh size of the small-diameter inner strainer tube portion 51i that cannot take a large mesh partial surface area is smaller than that of the relatively large-diameter outer strainer tube portion 51o that can take a larger mesh partial surface area than the inner strainer tube portion 51i. By being coarse with respect to the mesh particle size, the performance of the pump 11 is not impaired without impeding the flow of the fuel oil or water as a foreign substance.

FIG. 11 is a view showing still another modification of the strainer configuration of the pump unit.
In the description, the same or similar components as those in the fuel supply device according to the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the present embodiment, an attachment plate 58 for attaching and fixing the strainer 51 to the strainer attachment lid 52 is provided at the opening on one end side in the axial direction shown in FIGS. 5 and 6, and the other end in the axial direction is provided. In the cylindrical strainer 51 in which the annular contact frame portion 51f is integrally provided in the opening portion on the side, a detection portion protecting strainer 91 is further provided in the opening portion on one end side in the axial direction. And

FIG. 12 is a configuration diagram of an embodiment of the detection unit protecting strainer.
FIG. 13 is an assembly diagram of the detection portion protecting strainer shown in FIG. 12.
The detecting portion protecting strainer 91 has a dish-like structure that is a flat mesh portion 93 inside the frame 92. In the example shown in the drawing, the frame 92 of the detecting portion protecting strainer 91 is designed to improve the rigidity of the other end in the axial direction of the strainer 51 when the cylindrical strainer 51 is installed in the strainer mounting chamber 44 of the pump unit 40. As shown in FIG. 13, it also serves as the contact frame 51f, and is detachably or fixedly attached to the opening on the other end side in the axial direction of the cylindrical strainer 51. The detection portion protecting strainer 91 is attached to the cylindrical strainer 51, and the mesh portion 93 serves as a second strainer. The fuel oil inlet 44c of the strainer mounting chamber 44 and the strainer 51 cylinder are used as the second strainer. It is configured to intervene between the internal water detection sensor 32. On the other hand, the cylindrical strainer 51 is configured as a first strainer interposed between the fuel oil liquid inlet 44c and the fuel oil outlet 44d formed in the strainer mounting chamber 44.

  Here, the interrelationship between the filtration particle sizes of the detecting portion protecting strainer 91 and the cylindrical strainer 51 is the same as the filtration particle size of the inner strainer tube portion 51i and the outer strainer tube portion 51o in the case of the strainer 51 shown in FIG. Similarly to the mutual relationship, the mesh size of the detection unit protecting strainer 91 is coarser than the mesh size of the cylindrical strainer 51, and metal powder (metal) mixed in the fuel oil flowing in from the inlet 42 is used. It is possible to prevent the conductive solid foreign matter such as sludge) from adhering to the detection cylindrical electrode 33a and the grounding cylindrical electrode 33b of the water detection sensor 32, so that the flow of fuel oil or water as foreign matter is not hindered. It has become. For example, assuming that the filtration particle size of the cylindrical strainer 51 is 80 μm, the filtration particle size of the detection portion protecting strainer 91 is as coarse as 300 μm.

FIG. 14 is an enlarged configuration diagram of a strainer mounting chamber portion of the pump unit in which the first and second strainers shown in FIG. 12 are installed.
Also in the case of the present embodiment, the detection portion protecting strainer 91 is interposed between the fuel oil introduction port 44 c of the strainer mounting chamber 44 and the water detection sensor 32 inside the cylinder of the strainer 51, whereby the water detection sensor 32. It is possible to prevent a foreign substance such as a metal having a high capacitance value from coming into contact with the detection cylindrical electrode 33a. This point will be described in detail. The filtering particle size (β in FIG. 12) of the detecting portion protecting strainer 91 is less than the interval (separation distance) α between the lower portion of the detecting cylindrical electrode 33 and the inner peripheral surface of the strainer 51 in FIG. 14, that is, α> β Is set to For this reason, even if a fuel oil liquid containing a foreign substance having a size larger than α flows in from the fuel oil liquid inlet 44c of the strainer mounting chamber 44, the foreign substance is removed from the fuel oil liquid by the detecting portion protecting strainer 91. Is done. For this reason, it is possible to prevent foreign matters having a size larger than the separation distance α from conducting between the detection cylindrical electrode 33a and the strainer 51 which is also the ground electrode of the water detection sensor 32. Thereby, the false detection of the water detection sensor 32 can be prevented, and the detection performance can be improved.

  Also in the present embodiment, the mesh size of the detection portion protection strainer 91 having a dish-like structure in which the mesh partial surface area cannot be increased is larger than that of the detection portion protection strainer 91 of the cylindrical strainer 51 in which the mesh partial surface area can be increased. By being coarse with respect to the mesh particle size, the performance of the pump 11 is not impaired without impeding the flow of the fuel oil or water as a foreign substance. Further, with respect to the strainer 91 for protecting the detection portion, the mesh surface area of the mesh is increased by making the flat mesh-like mesh portion 93 inside the frame body 92 into a bowl shape or a cylindrical shape as shown in FIG. The number of meshes can be increased, and only the flow of fuel oil or water as a foreign substance can be further improved.

  Further, as shown in FIG. 13, if the detecting portion protecting strainer 91 is detachable from the opening on the other end side in the axial direction of the cylindrical strainer 51, the strainer mounting lid 52 is removed from the casing 41. After the removal, even if the cylindrical strainer 51 is not removed from the strainer mounting lid 52, the arrangement state of the cylindrical strainer 51 and the water detection sensor 32 can be changed only by removing the detection portion protecting strainer 91. In addition, the inside of the cylindrical strainer 51 including the water detection sensor 32 can be easily maintained.

In the present embodiment, the frame 92 of the detection unit protecting strainer 91 is configured to also serve as the contact frame 51f of the cylindrical strainer 51. However, the frame 92 may be separate from the contact frame 51f. Absent. In that case, the installation position of the strainer 91 for protecting the detecting portion in the axial direction of the strainer 51 is shifted from the contact frame 51f side to the sensor main body 33 side, for example, the inside of the strainer 51 is connected to the strainer mounting chamber opening side portion 44e. You may make it provide so that the strainer attachment chamber back part 44f may be defined. As a result, a part of the fuel oil liquid flowing into the strainer mounting chamber 44 from the fuel oil liquid inlet 44c does not pass through the detection portion protection strainer 91, passes only through the strainer 51, and passes through the fuel oil liquid outlet 44d. It is also possible to spill.
In addition, for the fine solid foreign matter that passes through the detection portion protection strainer 91 and gradually accumulates in the strainer 51 as the ground electrode of the water detection sensor 32, the large size solid foreign matter is filtered by the detection portion protection strainer 91. Therefore, it is determined based on the detection output of the water detection sensor 32 that a certain amount or more of fine solid foreign matter is accumulated, and maintenance is performed before the amount of fine solid foreign matter to be erroneously detected is accumulated. It is also possible to notify that it is necessary.

FIG. 15 is a configuration diagram of another embodiment of the detection unit protecting strainer.
The strainer 91 for protecting the detecting portion according to this embodiment is detachably or fixedly attached to the mounting plate 58 so as to cover the periphery of the detecting cylindrical electrode 33. According to the present embodiment, not all of the fuel liquid that has flowed in from the fuel oil liquid inlet 44c of the strainer mounting chamber 44 passes through the detection portion protecting strainer 91, but only a portion of the cylindrical strainer 51 is removed. Since it can pass through and flow out from the fuel oil liquid outlet 44d, the flow of the fuel oil liquid can be further improved. Further, since the detection portion protecting strainer 91 is provided around the detection cylindrical electrode 33, foreign matters such as metal pieces are mixed between the bottom portion of the detection cylindrical electrode 33 and the inner peripheral bottom surface portion of the strainer 51. It is possible to prevent the water detection sensor 32 from erroneously detecting the foreign matter as water.

In addition to these, various modifications can be adopted for the fuel supply device according to the present invention.
For example, in the above-described embodiment, the pump 11 is described based on the fact that it is a gear pump (gear pump). However, other types of configurations such as a vane type can be applied.
The fuel oil liquid may be a liquid fuel such as liquid hydrogen.

  Further, the mounting configuration of the water detection sensor mounting tool 34 to the strainer mounting lid 52 is not limited to mounting and fixing with screws, and various mounting means can be employed. In that case, the structure which can attach and detach the sensor main body 33 of the water detection sensor 32 to the strainer attachment chamber 44 by advancing and retreating the strainer attachment chamber 44 without rotating the strainer attachment lid itself and the water detection sensor 32 is appropriately adopted. Thus, positioning of the water detection sensor 32 in the strainer mounting chamber 44 is facilitated.

  The place where the water detection sensor 32 is provided is not limited to the strainer mounting chamber but may be, for example, the filter chamber 48. The water detection sensor 32 is mounted on the filter mounting lid 73 and the water detection mechanism 30 is supplied with fuel. You may make it provide in a path | route.

  In this embodiment, the water detection sensor 32 detects the presence or absence of water in the fuel by a detection unit that detects the degree of water mixing in the fuel by a change in electrical characteristics. When the mounting lid is provided integrally or detachably, the present invention is not limited to this. For example, a water detection sensor that measures the amount of water mixed (the degree of water mixing) using a float may of course be used. It is.

1 Oiling device, 2 Oiling device body, 11 Pump, 12 Pump motor,
13 Flow meter, 14 Flow transmitter, 15 Internal piping, 16 Lubrication hose,
17 Refueling nozzle, 18 Nozzle storage, 19 Nozzle switch,
20 indicator, 21 underground piping, 22 underground tank, 23 control device,
30 water detection mechanism, 31 water reservoir, 32 water detection sensor,
33 sensor body, 33a cylindrical electrode for detection, 33b cylindrical electrode for grounding,
33c Cylindrical insulating member, 34 Water detection sensor mounting tool, 34a mounting portion,
34b flat part, 35 conductive tool, 35a coil spring,
35b contact plate,
36 Sensor amplifier circuit, 37 Power supply / barrier, 38 Abnormal water contamination detection unit,
40 pump unit, 41 casing,
42 inlet, 43 outlet, 44 strainer mounting chamber,
44a Strainer mounting opening, 44b Strainer receiving part,
44c Fuel oil liquid inlet, 44d Fuel oil liquid outlet,
44e Strainer mounting chamber opening side portion, 44f Strainer mounting chamber back side portion,
45 check valve mounting chamber, 45a check valve mounting opening,
45b valve seat, 45c communication opening, 45d outflow opening,
46 Rotor chamber, 46a Suction port, 46b Discharge port, 47 Air separation chamber,
48 filter chamber, 48a filter mounting opening, 48b filter receiver,
48c Fuel oil liquid inlet, 48d Fuel oil liquid outlet, 49 Gas-liquid separation chamber,
49a Float valve mounting opening, 51 strainer, 51f contact frame,
51o outer strainer tube, 51i inner strainer tube,
52 Strainer mounting lid, 52a Sensor mounting screw hole,
52a1 mounted portion, 52a2 sensor insertion hole, 52b strainer mounting screw hole,
53 communication path, 54 inflow check valve, 55 coil spring,
56 Check valve mounting lid, 57 Suction side flow path, 58 Mounting plate,
58a fixing screw, 58b fixing screw insertion hole, 58c sensor body insertion hole,
59 sensor body holding member, 61 gear pump, 62 rotor,
62a engaging portion, 63 pinion, 63a recess, 64 rotating shaft 65 partitioning portion, 65a pinion sliding contact surface, 65b rotor sliding contact surface,
66 Discharge side flow path, 67 Gear pump mounting lid,
71 Gas enriched liquid outflow hole, 72 filter, 73 filter mounting lid,
74 outflow path, 75 outflow check valve, 76 return hole,
77 Air release hole, 78 Float valve, 79 Float valve mounting lid,
81 relief passage, 82 relief valve, 83 coil spring,
84 Relief valve mounting lid, 85 stagnation plate, 91 Strainer for protecting the detector,
92 frame, 93 mesh part.

Claims (7)

A pump provided in a fuel supply path for supplying fuel from a liquid storage tank to a supply target;
A water detection mechanism for detecting the degree of mixing of water into the fuel supplied to the supply target via the fuel supply path;
A fuel supply comprising a water abnormality detection unit that detects whether or not there is an abnormal degree of water contamination in the fuel supplied to the supply target based on the degree of water contamination detected by the water detection mechanism A device,
The pump is configured as a pump unit disposed in the same casing together with a strainer provided in the fuel supply path on the suction side of the pump, an air separator and a filter provided in the fuel supply path on the discharge side of the pump. ,
The water detection mechanism is configured to open the strainer mounting opening so as to close the strainer mounting opening formed in the casing in order to insert and dispose the strainer in a strainer mounting chamber formed in the casing of the pump unit. A fuel supply device, wherein the fuel supply device is integrally provided on a strainer mounting lid that is detachably attached to the portion. The strainer
A cylindrical filtration surface,
A cylindrical axial base that is detachably fixed to the strainer mounting lid;
A cylindrical axial tip that detachably engages with the outer peripheral edge of the inlet of the strainer mounting chamber;
It is configured as a cylindrical strainer that causes the fuel flowing in from the inlet of the strainer mounting chamber to pass through the filtration surface portion from the inside of the cylinder to the outside of the cylinder, and flows out from the outlet of the strainer mounting chamber,
The detection unit for detecting the degree of water mixing in the fuel of the water detection mechanism is accommodated in the cylindrical portion of the strainer and is detachably and integrally attached to the strainer attachment lid. The fuel supply device according to claim 1, wherein In the strainer or the strainer mounting lid,
The strainer is inserted between the inlet of the strainer mounting chamber and the detection unit of the water detection mechanism in a state where the distal end portion in the cylinder axial direction of the strainer is engaged with the outer peripheral edge of the inlet of the strainer mounting chamber. The fuel supply device according to claim 2, further comprising a strainer for detecting the detection unit. The detection part protecting strainer is:
With the strainer mounting lid attached to the strainer mounting opening, the outer peripheral edge of the inlet of the strainer mounting chamber and the strainer The fuel supply device according to claim 3, wherein the fuel supply device is sandwiched between a tip portion in a cylinder axis direction and the filtering surface portion covers an inlet of the strainer mounting chamber. The fuel supply device according to claim 3, wherein a filtration particle size of the strainer for protecting the detection unit is larger than a filtration particle size of the filtration surface portion of the strainer. The fuel supply device according to claim 1, wherein the strainer mounting lid is provided with a water detection mechanism holding unit that holds the detection unit of the water detection mechanism in a liquid-tight manner in the strainer mounting chamber. A pump provided in a fuel supply path for supplying fuel from a liquid storage tank to a supply target;
A water detection mechanism for detecting the degree of mixing of water into the fuel supplied to the supply target via the fuel supply path;
A fuel supply comprising a water abnormality detection unit that detects whether or not there is an abnormal degree of water contamination in the fuel supplied to the supply target based on the degree of water contamination detected by the water detection mechanism A device,
The pump is configured as a pump unit disposed in the same casing together with a strainer provided in the fuel supply path on the suction side of the pump, an air separator and a filter provided in the fuel supply path on the discharge side of the pump. ,
The water detection mechanism includes a filter mounting opening for closing the filter mounting opening formed in the casing in order to insert and dispose the filter in a filter chamber formed in the casing of the pump unit. A fuel supply device, wherein the fuel supply device is provided integrally with a filter mounting lid that is detachably mounted on the filter.

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