Liquid fuel supply unit

Abstract

To enable a liquid fuel supply apparatus to quickly resume fuel supply by employing a mechanism, by which power distribution to a motor is automatically cut off when measuring an insulation resistance of the motor, so as to easily measure the insulation resistance of the motor even by a person with little knowledge about the motor.SOLUTION: A liquid fuel supply apparatus that supplies a liquid fuel by driving a pump by a motor 101 comprises a connector 200 connected to the motor 101 and a connector 230 connected to a power source (200 V) that applies voltage to the motor 101. The connector 200 can be connected to any of the connector 230 connected to the power source (200 V) and a third connector connected to an insulation resistance measuring device that measures an insulation resistance of the motor 101.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a liquid fuel supply device, and more particularly to a liquid fuel supply device having a connector connected to a motor that drives a pump that supplies liquid fuel. [Background technology]

[0002] A liquid fuel supply device typically has a pump driven by a motor within the device, and supplies liquid fuel pressure-fed by the pump to a vehicle or the like (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-190658 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, it is desirable to be able to quickly resume fuel supply from the liquid fuel supply device after it has been submerged in water due to a flood or the like. However, to confirm whether a motor that has been submerged can still be used or whether there will be any problems if power is supplied to the motor, it is necessary to measure the insulation resistance of the motor and check whether there is any abnormality in the motor.

[0005] Furthermore, it is desirable that the motor be checked for abnormalities by someone with knowledge of motors, but if such a person (inspector) is not available, the fuel supply from the liquid fuel supply device must be resumed until the inspector arrives.

[0006] The present invention provides a liquid fuel supply device that employs a mechanism for automatically cutting off power to the motor when measuring the motor's insulation resistance, thereby enabling even a person with little knowledge of motors to easily measure the motor's insulation resistance and enabling fuel supply by the liquid fuel supply device to be quickly resumed. [Means for solving the problem]

[0007] The liquid fuel supply device of the present invention is a liquid fuel supply device that supplies liquid fuel by driving a pump with a motor, and is equipped with a first connector connected to the motor and a second connector connected to a power source that supplies voltage to the motor, and the first connector is connectable to both the second connector connected to the power source and a third connector connected to an insulation resistance measuring instrument that measures the insulation resistance of the motor. [Effects of the Invention]

[0008] According to the present invention, by adopting a mechanism in which the power supply to the motor is automatically cut off when the insulation resistance of the motor is measured, even a person with little knowledge about motors can easily measure the insulation resistance of the motor, and fuel supply by the liquid fuel supply device can be quickly resumed. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing the overall configuration of a liquid fuel supply device according to a first embodiment. [Figure 2] 3 is a diagram showing a connector connected to a motor and a connector connected to a magnet switch according to the first embodiment. FIG. [Figure 3] 3 is a diagram showing a connector connected to the motor of the first embodiment and a connector connected to an insulation resistance measuring instrument. FIG. [Figure 4] 10 is a diagram showing a connector connected to a motor of a second embodiment and a connector connected to the connector; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] The present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, it goes without saying that the components are not necessarily essential unless otherwise specified or considered to be obviously essential in principle.

[0011] Example 1 Fig. 1 is a diagram showing the overall configuration of a liquid fuel supply device of Example 1. As shown in Fig. 1, the liquid fuel supply device is installed, for example, at a gas station, and pumps up liquid fuel (for example, diesel, regular gasoline, or premium gasoline) stored in an underground tank 2 and supplies it to vehicles or the like.

[0012] (Liquid fuel supply device 1) The liquid fuel supply device 1 includes motors 101-103, pumps 111-113, flow meters 121-126, a storage box 130, a magnetic switch 140, a power supply 150, and a display 160. The motors 101-103 drive the pumps 111-113, respectively. These motors 101-103 are waterproof. The pumps 111-113 pump up liquid fuel from the underground tank 2 and pump it out. For example, the pump 111 is for diesel, the pump 112 is for regular gasoline, and the pump 113 is for premium gasoline. The flow rates of the liquid fuel supplied from the pumps 111-113 to vehicles and the like are measured by the flow meters 121-126. The flow meters 121, 123, and 125 measure the flow rates of the liquid fuel discharged from diesel nozzles, regular nozzles, and premium gasoline nozzles (not shown) on the surface of the liquid fuel supply device 1, respectively. Furthermore, the flow meters 122, 124, and 126 measure the flow rates of the liquid fuel discharged from a diesel nozzle, a regular nozzle, and a high-octane nozzle (not shown) on the rear surface of the liquid fuel supply device 1. If there are multiple pumps, naturally, multiple motors and magnetic switches are also provided correspondingly.

[0013] The storage box 130 stores connectors and an insulation resistance measuring instrument, which will be described later. This storage box 130 is waterproof. The storage box 130 may be explosion-proof and may be lockable. The magnetic switch 140 is connected between the motors 101 to 103 and a power source 150. The power source 150 supplies AC voltage for driving the motors 101 to 103, DC voltage for connecting the contacts of the magnetic switch 140, and the like. The display 160 displays the type of oil supplied from the nozzle and the flow rate of the liquid fuel. The area in which the storage box 130, the magnetic switch 140, and the display 160 are provided is an explosion-proof area that prevents flammable gases from becoming an ignition source for fires or explosions.

[0014] FIG. 2 is a diagram showing a connector connected to the motor and a connector connected to the magnet switch according to the first embodiment.

[0015] (Connector 200 (first connector) connected to motor 101) First, referring to FIG. 2, the connector 200 (first connector) connected to the motor 101 of the first embodiment will be described in detail. The connector 200 is connected to the motor 101. Here, the connector 200 connected to the motor 101 will be described, but the connectors connected to the motors 102 and 103 are similar to the connector 200, so their description will be omitted. The connector 200 has six terminals 211 to 216. The motor 101 is a three-phase AC motor, and the terminals 211 to 213 are connected to the U-phase coil, V-phase coil, and W-phase coil of the motor 101, respectively. The terminals 211 to 213 are motor terminals. An AC voltage (e.g., 200 V) for driving the motor 101 is supplied from the power source 150 to each of the terminals 211 to 213 via the magnet switch 140 and the connector 230. The terminal 214 is connected to a frame ground (FG). The terminals 215 and 216 are connected internally or externally. Terminals 215 and 216 are supply path connecting terminals that connect a supply path that supplies a DC voltage (for example, 24 V) for connecting the contacts of magnet switch 140. This DC voltage is supplied from an AC / DC converter or the like in power supply 150. Pins 225 and 226 of terminals 215 and 216 are shorter than pins 221 to 224 of terminals 211 to 214. Therefore, when connector 200 is removed from connector 230, terminals 215 and 216 are removed before terminals 211 to 214. Connector 200 can be connected to connector 230, which is connected to power supply 150 via magnet switch 140.

[0016] (Connector 230 (second connector) connected to power supply 150) Next, details of the connector 230 (second connector) connected to the power supply 150 in the first embodiment will be described. The connector 230 is connected to the power supply 150 via the magnet switch 140. The connector 230 has six terminals 241 to 246. The six terminals 241 to 246 are connected to the six terminals 211 to 216 of the connector 200 described above, respectively. The AC voltage for driving the motor 101, which is supplied from the power supply 150, is supplied to the motor 101 via the magnet switch 140, terminals 241 to 243 of the connector 230, and terminals 211 to 213 of the connector 200. The terminals 241 to 243 are motor power supply terminals connected to the power supply 150 that supplies the AC voltage to the motor 101. The terminal 244 is connected to a frame ground (FG). Furthermore, the terminals 245 and 246 are connected to the terminals 215 and 216 of the connector 200, respectively. Terminal 246 is connected to power supply 150, which supplies a DC voltage for connecting the contacts of magnet switch 140. The DC voltage supplied from power supply 150 is supplied to magnet switch 140 via terminals 246, 216, 215, and 245. When DC voltage is supplied to magnet switch 140, the contacts of magnet switch 140 are connected. As a result, AC voltage for driving motor 101 is supplied to motor 101 via magnet switch 140. Terminals 245 and 246 are contact terminals that supply DC voltage for connecting the contacts of magnet switch 140 to magnet switch 140.

[0017] (Connector 310 (third connector) connected to insulation resistance measuring instrument 300) FIG. 3 is a diagram showing a connector connected to an insulation resistance measuring instrument. Referring to FIG. 3, details of connector 310 (third connector) connected to insulation resistance measuring instrument (hereinafter referred to as measuring instrument) 300 will be described. Measuring instrument 300 is a device for measuring the insulation resistance of motors 101-103 and checking for abnormalities such as electrical leakage in motors 101-103. Measuring instrument 300 is stored in storage box 130, for example. Connector 310 has six terminals 321-326. Each of the six terminals 321-326 is connectable to each of the six terminals 211-216 of connector 200 described above. In other words, connector 200 is connectable to both connector 230 connected to power supply 150 and connector 310 connected to measuring instrument 300. Each of terminals 321-323 is connected to terminals 211-213 connected to motor 101. Terminal 324 is connected to terminal 214 connected to frame ground (FG). Terminals 325 and 326 are connected to terminals 215 and 216, respectively.

[0018] (Method for measuring motor insulation resistance) When measuring the insulation resistance of the motor 101, an inspector disconnects the connector 200 connected to the motor 101 from the connector 230 connected to the magnet switch 140. As shown in FIG. 2 , when disconnecting the connector 200 from the connector 230, the pins 225 and 226 are shorter than the other pins 221 to 224, so the connections between the terminals 215 and 216 and the terminals 245 and 246 are disconnected before the other terminals. When the connections between the terminals 215 and 216 and the terminals 245 and 246 are disconnected, the supply of DC voltage to the magnet switch 140 is cut off, and the contacts of the magnet switch 140 are disconnected. As a result, the supply of AC voltage from the power supply 150 to the motor 101 is cut off in the magnet switch 140. Furthermore, when the connections between the terminals 211 to 213 and the terminals 241 to 243 are disconnected, the motor 101 and the power supply 150 are completely disconnected.

[0019] Next, the inspector attaches connector 200, which has been removed from connector 230, to connector 310, which is connected to measuring instrument 300. As shown in Fig. 3, terminals 211 to 213, which are connected to motor 101, are connected to terminals 321 to 323, which are connected to measuring instrument 300, so that the insulation resistance of motor 101 can be measured.

[0020] (Effects of Example 1) Connector 200 can be connected to both connector 230, which is connected to power source 150, and connector 310, which is connected to measuring instrument 300 that measures the insulation resistance of motor 101. When measuring the insulation resistance, an inspector removes connector 200 from connector 230 and attaches it to connector 310. During this procedure, power to motor 101 is automatically cut off, so even someone with little knowledge about motors can easily measure the insulation resistance of motor 101. Therefore, fuel supply by liquid fuel supply device 1 can be quickly resumed without waiting for the arrival of someone with knowledge about motors.

[0021] When measuring the insulation resistance of the motor 101, the connector 200 is removed from the connector 230, completely disconnecting the motor 101 from the power supply 150. Therefore, when measuring the insulation resistance of the motor 101, the supply of voltage from the power supply 150 to the motor 101 can be reliably cut off.

[0022] The voltage for connecting the contacts of magnetic switch 140 is supplied when connector 200 and connector 230 are connected, and is not supplied when connectors 200 and 230 are not connected. When connector 200 is removed from connector 230 during measurement of the insulation resistance of motor 101, the contacts of magnetic switch 140 are disconnected. This allows magnetic switch 140 to cut off the supply of AC voltage from power supply 150 to motor 101.

[0023] Connector 200 has terminals 211-213 connected to motor 101, and terminals 215 and 216 that connect a supply path that supplies a voltage for connecting the contacts of magnet switch 140. Connector 230 also has terminals 241-243 that are connected to terminals 211-213 and are connected to power supply 150 that supplies voltage to motor 101, and terminals 245 and 246 that are connected to terminals 215 and 216 and supply voltage to magnet switch 140 for connecting the contacts of magnet switch 140. By disconnecting terminals 215 and 216 from terminals 245 and 246, the contacts of magnet switch 140 are disconnected, and power supply 150 and motor 101 can be disconnected. Furthermore, by disconnecting terminals 211-213 from terminals 241-243, power supply 150 and motor 101 can be reliably disconnected.

[0024] Pins 225 and 226 of terminals 215 and 216 are shorter than pins 221 to 224 of terminals 211 to 214. This allows the electrical connection with magnet switch 140 to be cut off earlier than the electrical connection with motor 101, preventing voltage from being supplied from power supply 150 to motor 101.

[0025] Indicator 160, which displays the amount of liquid fuel supplied, is provided in the explosion-proof area, and connector 200 and connector 230 are also provided in the explosion-proof area. This makes it possible to connect / disconnect connector 200 and connector 230 in the explosion-proof area, and prevents sparks and the like from occurring at the connection points of the connectors.

[0026] Example 2 In the first embodiment, the AC voltage from the power supply 150 is supplied via the magnet switch 140 and the connector 230, but in the second embodiment, the AC voltage from the power supply 150 is supplied directly to the motor 101 from the magnet switch 140.

[0027] 4 is a diagram showing a connector connected to a motor and a connector connected to the motor according to Example 2. Note that the same explanation as in Example 1 will be omitted as appropriate.

[0028] (Connector 400 (first connector) connected to motor 101) Referring to FIG. 4, details of a connector 400 (first connector) connected to the motor 101 of the second embodiment will be described. The connector 400 is connected to the motor 101. The connector 400 has six terminals 411 to 416. An AC voltage for driving the motor 101 is supplied to each of the terminals 411 to 416 from the power supply 150 via the magnet switch 140. In the first embodiment, the AC voltage is supplied to the motor 101 from the power supply 150 via the magnet switch 140, connector 230, and connector 200, but in the second embodiment, the AC voltage is supplied to the motor 101 from the power supply 150 via the magnet switch 140. The terminals 415 and 416 are connected to terminals 435 and 436, respectively, which will be described later. The terminals 415 and 416 are contact terminals that supply a DC voltage to the magnet switch 140 for connecting the contacts of the magnet switch 140.

[0029] (Connector 420 (second connector) connected to connector 400) Next, details of the connector 420 connected to the connector 400 of the second embodiment will be described. The connector 420 has six terminals 431 to 436. The six terminals 431 to 436 are connected to the six terminals 411 to 416 of the connector 400 described above, respectively. The terminals 431 to 433 are insulated. The terminals 435 and 436 are connected to the terminals 415 and 416 of the connector 400, respectively. The terminals 435 and 436 are connected internally or externally. The terminals 435 and 436 are supply path connecting terminals that connect a supply path that supplies a DC voltage for connecting the contacts of the magnet switch 140. The DC voltage for connecting the contacts of the magnet switch 140, which is supplied from the power source 150, is supplied to the magnet switch 140 via the terminals 416, 436, 435, and 415.

[0030] (Method for measuring motor insulation resistance) When measuring the insulation resistance of motor 101, the inspector removes connector 400 connected to motor 101 from connector 420 fixed to liquid fuel supply device 1. This disconnects the supply path that supplies DC voltage for connecting the contacts of magnetic switch 140, cutting off the supply of DC voltage to magnetic switch 140 and disconnecting the contacts of magnetic switch 140. As a result, magnetic switch 140 cuts off the supply of AC voltage from power source 150 to motor 101.

[0031] Next, the inspector attaches connector 400, which has been removed from connector 230, to connector 310, which is connected to measuring instrument 300. As shown in Fig. 4, terminals 411 to 413, which are connected to motor 101, are connected to terminals 321 to 323, which are connected to measuring instrument 300, so that the insulation resistance of motor 101 can be measured.

[0032] (Effects of Example 2) Connector 400 can be connected to both connector 400, which connects a supply path that supplies voltage for connecting the contacts of magnet switch 140, and connector 310, which is connected to measuring instrument 300 that measures the insulation resistance of motor 101. When measuring the insulation resistance, an inspector removes connector 400 from connector 420 and attaches it to connector 310. During this procedure, power to motor 101 is automatically cut off, making it easy for even someone with little knowledge of motors to measure the insulation resistance of motor 101. Furthermore, fuel supply by liquid fuel supply device 1 can be quickly resumed without waiting for the arrival of someone with knowledge of motors. Furthermore, the connector of Example 2 is designed to send AC voltage (200 V) from the power source to the magnet switch without passing through a connector, and therefore is not designed to support AC voltage as compared to the connector of Example 1, thereby reducing costs.

[0033] In the above embodiment, the storage box 130 is provided in a waterproof or explosion-proof housing, but this is not limiting and the storage box 130 may be provided in an explosion-proof area in the housing that houses the display 160. This eliminates the need to provide a box to house the connector and an explosion-proof area for installing the connector.

[0034] Although the present invention has been described above with reference to the embodiments, the above embodiments are merely illustrative of specific examples of how the present invention can be implemented, and the technical scope of the present invention should not be construed as being limited by these embodiments. In other words, the present invention can be implemented in various forms without departing from its technical concept or main features. [Explanation of symbols]

[0035] 1: Liquid fuel supply device, 101, 102, 103: Motor, 111, 112, 113: Pump, 140: Magnetic switch, 150: Power supply, 160: Display, 200: Connector, 230: Connector, 300: Insulation resistance measuring instrument, 310: Connector

Claims

1. A liquid fuel supply device that supplies liquid fuel by driving a pump with a motor, a first connector connected to the motor; a second connector connected to a power source that supplies voltage to the motor; the first connector is connectable to both the second connector connected to the power supply and a third connector connected to an insulation resistance measuring instrument that measures insulation resistance of the motor, a magnetic switch connected between the motor and the power supply; The voltage for connecting the contacts of the magnetic switch is supplied when the first connector and the second connector are connected, and is not supplied when the first connector and the second connector are not connected. A liquid fuel supply device characterized by:

2. 2. The liquid fuel supply device according to claim 1, wherein the first connector is detached from the second connector to disconnect the motor from the power source when the insulation resistance of the motor is measured.

3. The first connector is a motor terminal connected to the motor; a supply path connecting terminal for connecting a supply path for supplying a voltage for connecting the contacts of the magnetic switch, The second connector is a motor power supply terminal connected to the motor terminal and connected to the power supply that supplies a voltage to the motor; a contact terminal connected to the supply path connection terminal and supplying the voltage for connecting the contacts of the magnet switch to the magnet switch.

2. The liquid fuel supply device according to claim 1.

4. The pins of the supply path connection terminal are shorter than the pins of the motor terminal.

4. The liquid fuel supply device according to claim 3.

5. It is equipped with an indicator that shows the amount of liquid fuel supplied, and has an explosion-proof area that prevents flammable gases from becoming an ignition source for fires or explosions. The first connector and the second connector are provided in the explosion-proof area.

2. The liquid fuel supply device according to claim 1.

6. A liquid fuel supply device that supplies liquid fuel by driving a pump with a motor, a first connector connected to the motor; a magnetic switch connected between the motor and a power source that supplies a voltage to the motor; a second connector for connecting a supply path for supplying a voltage for connecting contacts of the magnetic switch; a first connector that is connectable to both the second connector that connects the supply path and a third connector that is connected to an insulation resistance measuring instrument that measures the insulation resistance of the motor;

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