JP2012250744A - Liquid feeding apparatus - Google Patents

Abstract

A liquid supply apparatus capable of stopping liquid supply when water is mixed in fuel oil.
[MEANS FOR SOLVING PROBLEMS] A water detection means (4) is provided in an underground tank type fueling device (1) to separate moisture mixed in oil such as fuel oil, detect the amount of moisture with a water level sensor, and signal the water level. A water detection circuit for transmission is provided, and the output signal from the water level detection circuit is stored in the storage means and compared with the data to determine whether there is an abnormality. If an abnormality is determined, the metering controller automatically stops the oiling motor. Let
[Selection] Figure 1

Description

  The present invention relates to a liquid supply apparatus that prevents supply of fuel oil mixed with water.

A plurality of underground tanks are buried in the gas station, and oil pipes are connected to these underground tanks. Further, fuel oil is supplied to the vehicle by a fuel nozzle from the manhole pit at the upper end, connected to a horizontal pipe, pulled out from the manhole, and via a fueling mechanism of a fueling device.
However, if the horizontal pipe is corroded, groundwater or rainwater flows from the corroded portion and flows into the vehicle, causing inconvenience to the engine.

  Moreover, in order to detect the water | moisture content currently disperse | distributed to the fuel oil of an underground tank, as shown in patent document 1, it arrange | positions several electroconductive boards as an electrode, and measures a moisture content with the electrostatic capacitance between electrodes. It has also been proposed.

  According to this, it is possible to increase the sensitivity of water detection by increasing the area of the conductive plate or reducing the interval between the conductive plates, but there is a problem that the size of the sensor becomes large, or an error is detected due to impurities entering between the conductive plates. There is a problem that occurs.

JP 2001-21519 A

  The present invention has been made in view of such a problem, and a first object thereof is a liquid supply device capable of stopping liquid supply when water is mixed in fuel oil. Is to provide.

    A second object of the present invention is to provide a water detector that is optimal for incorporation into a fueling device.

  In order to solve such a problem, the invention of claim 1 is provided with water detection means for detecting that water is mixed in oil such as fuel oil, and is supplied with oil by receiving an output from the water detection means. It was configured to notify the device or stop refueling.

  According to a second aspect of the present invention, the water detection means includes a transmission circuit that oscillates at a frequency corresponding to the capacitance between the counter electrodes of the double spiral winding disposed in the pipe line to which the fuel oil is supplied, The presence or absence of moisture in the fuel oil is detected based on the frequency from the transmission circuit and the data in the storage means.

  According to the invention of claim 1, it is possible to prevent the fuel oil mixed with water from being supplied as much as possible.

  According to the invention of claim 2, it is possible to reliably detect the water in the fuel oil without increasing the size of the water detecting means.

FIGS. 1A and 1B are diagrams showing an embodiment of the fueling device of the present invention. It is sectional drawing which shows one Example of a water detection means. FIGS. 1A and 1B are a cross-sectional view showing an embodiment of the water sensor and a partially enlarged view of the coil region. It is a block diagram which shows one Example of the oil supply apparatus of this invention.

Therefore, details of the present invention will be described below based on the illustrated embodiment.
FIG. 1 (a) shows an embodiment of the fueling device of the present invention. The fueling device 1 is connected to an underground tank 3 by a pipe 2 to a metering mechanism (not shown), preferably on the upstream side of the metering mechanism. Water detection means 4 is connected.

  1 (b), the same operation and effect can be obtained by connecting a plurality of fueling apparatuses 1 and 1 via the branch pipe 5 to the downstream side of the water detecting means 4 connected to the underground tank 3. Obtainable.

  As shown in FIG. 2, the water detection means 4 has a water sensor 10 (described later) disposed below the rising pipe 6 that communicates with the oil supply device, and an inflow pipe 7 that communicates with the underground tank 3 is connected horizontally above the water sensor 10. The rectifying plate 8 is disposed obliquely.

As a result, when fuel oil containing water flows in, part of the fuel oil is converted into a downward flow by the rectifying plate 8, and water having a higher specific gravity than the fuel oil is deposited in the lower region of the riser 6.
The contained water is detected by the water sensor 10.

  FIG. 3 shows an embodiment of a water sensor 10 most suitable for the water detection means 4, in which a coil 11 made of electrical insulation is wound around a double spiral, preferably a stainless steel wire, and two coils 12, 13 is formed, one end of each coil is drawn to the cable 14 side, and the formation region of the coils 12 and 13 is covered with an electrically insulating material 15 to constitute a sensor body. Note that a winding groove 16 for accommodating a coil is preferably formed on the surface of the column 11.

  In this way, the winding groove 16 is formed on the surface of the cylinder 11 which is a winding core, the conducting wire is wound so that the conducting wire is fitted into the groove 16, and further molded by the insulating layer 17. While being able to maintain the distance between each coil 12 and 13 which comprises, it can maintain the insulation between electrodes and can prevent electric leakage.

  The water sensor is molded with a resin 19 by inserting a coil non-formation region into a cylindrical body 18 serving as a sensor base, and a relay substrate 20 for connecting the coils 12, 13 and the cable 14 is molded with a silicon resin 21. The end of the cable is formed by molding with resin 22. An oscillation circuit 31 described later is preferably mounted on the relay substrate 20.

  As a result, the water sensor 10 and the cable 14 are firmly connected to each other via the cylindrical body 18 serving as a sensor base, and an excessive force acts between the coils 12 and 13 and the lead wires of the cable 14 in the silicon. It can be relaxed by the elasticity of the resin 21.

  FIG. 4 shows an embodiment of an oil supply device using the water detection means 4. The water detection circuit 30 includes an oscillation circuit 31 using the coils 12 and 13 of the water detection means 10 as capacitors and this oscillation. The counter 32 measures the frequency of the circuit 31 and the output means 33 that outputs a water level signal to the metering control device 40 based on the frequency.

As is well known, the metering control device 40 includes a motor driving means 41 that receives a signal from a nozzle switch 51 that detects whether the fuel nozzle is detached, and a flow rate pulse transmitter 52 of a flow meter that measures the fuel oil discharged from the fuel nozzle. Counting means 42 for counting the number of pulses, and display driving means 43 for converting the signal from the counting means 42 into a flow rate and outputting it to the display 53, and in the present invention, the signal from the water detection circuit 30 Thus, the water levels L1 and L2 accumulated in the water detection means 4 are determined based on the data in the storage means 44, and the result is output to the motor drive means 41 and the determination means 45 that outputs to the display drive means 43. .
Reference numeral 54 denotes an oil supply motor controlled by the motor drive means 41.

In this embodiment, when the nozzle is removed from the nozzle hook, the oil supply motor 54 is rotated by the motor driving means 41 in response to a signal from the nozzle switch 51.
When the nozzle is inserted into the automobile fuel tank and the oil supply lever is pulled up, fuel oil from a pump (not shown) driven by the oil supply motor 54 is sent and flows through the water detection means 4 into the automobile fuel tank. The fuel oil that has flowed in flows downward by the rectifying plate 8 and discharges water accumulated in the previous fuel supply to the water detection means 4.

  This fuel flow is measured by a flow meter, converted into a flow rate pulse from the pulse transmitter 52, converted into a liquid supply amount by the counting means 42, and displayed as a fuel supply amount on the display 53 by the display drive means 43.

On the other hand, during refueling, the fuel oil passes through the water detection means 4 and is discharged to the automobile fuel tank.
If water droplets are mixed in the fuel oil after the end of refueling, the specific gravity is larger than that of the fuel oil, so that it falls to the liquid reservoir. When the water level rises in this way, the relative permittivity of water is larger than that of fuel oil, so that the capacitance value between the coils 12 and 13 of the water sensor 10 rises and the frequency of the oscillation circuit 31 changes. To do. Thus, by making the electrostatic capacitance between the coils 12 and 13 a part of the oscillation circuit, the change in the electrostatic capacitance can be easily detected from the change in the frequency.

  When the water level exceeds L1 based on the change in frequency and the data stored in the storage unit 44, the determination unit 45 outputs a signal to the display unit driving unit 43 and issues a warning to the display unit 53.

  Further, when the determination unit 45 determines that the water level has risen to the level L2, the determination unit 45 outputs a signal to the motor drive unit 41 to stop the oil supply motor 54. Thereby, it is possible to prevent inflow of water to such an extent that the automobile fuel tank is damaged.

  DESCRIPTION OF SYMBOLS 1 Oil supply apparatus 4 Water detection means 6 Rising pipe 8 Current plate 10 Water sensor 12, 13 Coil 16 Winding groove 17 Insulating layer 30 Water detection circuit 40 Measurement control apparatus

Claims (5)

  An oil supply apparatus comprising water detection means for detecting that water has been mixed into oil such as fuel oil, etc., and receiving an output from the water detection means to notify the oil supply apparatus or stop oil supply. The water detection means includes a transmission circuit that oscillates at a frequency corresponding to the capacitance between the counter electrodes of the double spiral winding disposed in a pipe line to which fuel oil is supplied, and a frequency and storage means from the transmission circuit The fuel supply device according to claim 1, wherein the presence or absence of moisture in the fuel oil is detected based on the data of the fuel oil. The oil supply apparatus according to claim 2, wherein the counter electrode is configured by forming a double spiral groove on the surface of the insulating cylindrical body and winding a conductor around each groove. A horizontal inflow pipe that communicates with the underground tank is connected to the lower part of the riser pipe that communicates with the fueling device, and a rectifying plate for changing the direction downward from the inflow side is disposed in this connection region, and the liquid is disposed below the rectifying plate. The oil supply device according to claim 1, wherein a reservoir is formed, and the counter electrode of the double spiral winding is disposed in the liquid reservoir.   The oil supply device according to claim 2, wherein the oscillation circuit is accommodated in a sensor base portion that fixes the counter electrode and the cable.

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