JPH0446838B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a refueling system in which a hose processing device housing a refueling hose, a hose reel, a hose reel motor, and a nozzle position detection means is provided above the refueling position. This invention relates to a suspended refueling device in which a hose is suspended so that it can be raised and lowered.

[Prior Art] As is well known, in a refueling system that handles flammable liquids such as gasoline, electrical equipment installed in a hazardous area must be housed in an explosion-proof casing or use an intrinsically safe power supply circuit. That is, the structure is regulated by law because sparks from electrical equipment can ignite flammable liquids, which is dangerous. Suspended oil supply systems are equipped with various control devices, such as nozzle position detection means such as cam switches, and such control devices must be installed in dangerous locations.
As stated in the publication, it was an intrinsically safe circuit, and an intrinsically safe power supply circuit was installed in the control panel in the office. The reason for this is that the cost of an intrinsically safe power supply circuit is high. In intrinsically safe power supply circuits, current limits are specified so that even if a spark occurs due to a line short circuit, there is insufficient energy to ignite. Therefore, if a line for an intrinsically safe power supply circuit and a line for a general circuit are housed in the same conduit, if a short circuit occurs between the line for the general circuit and the line for an intrinsically safe power supply circuit, the intrinsically safe The purpose of the power circuit cannot be achieved. Therefore, lines for intrinsically safe power supply circuits and lines for general circuits cannot be housed and wired in the same conduit, and this is also stipulated by law.

Therefore, in the above-mentioned known technology, there is a line for the intrinsically safe circuit from the intrinsically safe power supply circuit in the control panel in the office to the case of the oil supply system, and a line for the general circuit used for, for example, an explosion-proof motor for lifting and lowering the hose. Two conduits were required. For this reason, a suspended refueling system that has a long length from the office to the hose processing case installed in the canopy is time-consuming to install and difficult to repair.

[Problems to be Solved] Therefore, an object of the present invention is to provide a suspended type oil supply system that can connect the hose processing case of the suspended type oil supply system and a control panel installed in an office with a single electrical conduit. It is on offer.

[Means for Solving the Problems] According to the present invention, a refueling hose in which a hose processing device housing a refueling hose, a hose reel, a hose reel motor, and a nozzle position detection means is provided above the refueling position can be freely raised and lowered. In a hanging type oil supply system, a circuit consisting of a fuse, a current-limiting resistor connected in series with the fuse, and a voltage-limiting Zener diode connected to the ground is molded in resin. A safe power supply circuit is provided within the hose treatment device, and the nozzle position detection means is connected to the control panel via the intrinsically safe power supply circuit.

[Description of function and effect] Since the intrinsically safe power supply circuit is installed in the hose processing case, the line from the office to the hose processing case or general use can be connected to control equipment with opening/closing contacts such as the nozzle position detection means. By wiring the signal line through an intrinsically safe power supply circuit, there is no need for an expensive explosion-proof structure. The hose reel motor will be an explosion-proof motor as before.

By providing the intrinsically safe power supply circuit in the hose processing case in this manner, an inexpensive ordinary device can be used as the nozzle position detection means, and a heavy explosion-proof structure is not required, and the weight of the hose processing device can be reduced.
Additionally, only one electrical conduit is needed from the office to the hose processing equipment, making construction easier. Furthermore, since the intrinsically safe power supply circuit is also molded with resin, there will be no short circuit in the input general circuit line.

[Preferred Embodiment] In carrying out the present invention, it is preferable that the nozzle position detection means uses a switch that opens and closes in conjunction with rotation of the hose elevating reel. However, for example, the nozzle position may be detected by using a pulse transmitter that transmits pulses in conjunction with the rotation of the hose lifting reel, or by counting the number of pulses, or by using a pulse transmitter that transmits pulses in conjunction with the rotation of the hose lifting reel. The nozzle position may be detected from the resistance value of the potentiometer by using a potentiometer whose resistance value changes.

[Examples] Examples of the present invention will be described below with reference to the drawings.

FIG. 1 shows a gas station having a suspended refueling system in which the present invention is implemented. A hose processing case 3 is supported via a strut 2, and a nozzle 5 and a hand switch 6 are provided at the tip of a refueling hose 4 suspended from the hose processing case 3. As is well known, the nozzle 5 can be stopped at a ceiling position A when the store is closed or when a large vehicle enters the store, at an intermediate position B during non-refueling operations, and at a refueling position C. A fuel supply indicator 7 and an outdoor switch 8 are provided on the wall W of the office O, and a control panel 9 is provided within the office O. On the other hand, in the pump chamber S, a pump 10 that pumps up oil from a tank (not shown) is driven by a drive motor 11, and the oil pumped up by the pump 10 is sent to an oil pipe 13 via a flow meter 12. Sent. The oil feed pipe 13 is connected to a hose 4 within the hose processing case 3. Flowmeter 12
is provided with a flow pulse transmitter 14, and the flow pulse signal from this flow pulse transmitter is transmitted through line L1.
The fuel amount is sent to the control panel 9 via the line L2, and the amount of oil supplied is displayed on the display meter 7 via the line L2. Further, as will be described later, the drive unit 15 of the drive motor 11 of the pump 10 is connected to a motor control circuit 41 in the control panel 9 via a line L3. The outdoor switch 8 is for moving the nozzle 5 between the ceiling position A and the intermediate position B, and is connected to a voltage determination circuit 40 in the control panel 9 via a line L4. Note that the hand switch 6 moves the nozzle 5 between an intermediate position B and a refueling position C.

According to the present invention, the control panel 9 provided in the office O and the hose processing case 3 are connected by one electric conduit T.

In the embodiment shown in FIG. 2, a horizontally movable trolley 20 is housed inside the hose processing case 3, and a hose reel 21 is placed on the trolley 20, and the hose 4 is wound around the hose reel 21. has been done. On the other hand, the oil feed pipe 13 passes through the hollow support 2 and extends into the hose processing case 3, and is connected to a connecting hose 22 via a connector 22 inside the hose processing case 3. This connecting hose 22 is connected to a hose reel. 21 swivel 24. The trolley 20 further includes a hose reel motor 25.
is provided, and the rotation of the hose reel motor 25 is reduced by a reducer 26 to rotate the hose reel 21. This hose reel 2
A nozzle position detection means 27, such as a cam switch, detects the rotational position of the hose reel 21.
The nozzle 5 is located close to the position A, B, and C of the nozzle 5.
can now be detected. In this way, the motor 25 and the nozzle position detection means 27 are provided inside the hose processing case 3. Electric wires extending inside the conduit T (in the illustrated example, line L5 is 2
The lines L6 (3 lines) are connected to the terminals of the terminal box 28, and in the terminal box 28, the line L5 leading to the hose reel motor 25 and the intrinsically safe line L5 with an explosion-proof barrier provided inside the hose processing case 3 A line L6 leading to the power supply circuit 29 is connected. The signal line L7 extending from the intrinsically safe power supply circuit 29 is connected to the line L8 via the terminal box 30, and the lines L5 and L8 extend along the connecting hose 23, and are therefore connected to the connecting hose 23 with a clamp 31. It is clamped. Line L8 is connected to nozzle position detection means 27 and hand switch 6, as will be described later in FIG. A line L8 connected to the hand switch 6 is routed through the hose 4.
Note that the two upper lines in FIG. 3 are positive lines, and the lower line L6 is a ground line.

FIG. 3 is a block diagram showing a control circuit implemented in the present invention, and the control panel 9 determines which contact is closed based on the voltage sent through the upper line L6, and makes this determination. Voltage determination circuit 4 that sends a motor control signal to motor control circuit 41 based on
0, and a motor control circuit 41 that receives a control signal from the circuit 40, drives the motor 11, and drives the motor 25 in forward and reverse directions. The intrinsically safe power supply circuit 29 includes fuses F1 and F2, current limiting resistors R1 and R2 connected in series, and voltage limiting Zener diodes Z1 and Z2 connected to earth E, and is made of epoxy resin or the like. It is molded. At the terminal box 30, the line from the resistor R1 of the intrinsically safe power supply circuit 29 is branched, and one line goes directly to the push button contact 6a for continuous lubrication of the hand switch, and the other line goes through the resistor R3 to the push button contact for raising and lowering the hose. 6b. Further, the line from the resistor R2 is branched into three, and the first line is directly connected to the first contact 27a of the cam switch that constitutes the nozzle position detection means.
The second line is connected to the second contact 27b of the cam switch via a resistor R4, and the third line is connected to the third contact 27c of the cam switch via a resistor R5. These resistors R3, R
4 and R5 all have different resistance values. Further, the contact 27a may be located at a ceiling position, for example.
It is assumed that b is in the intermediate position and contact 27c is closed in the refueling position. Therefore, no matter which contact is turned on, the voltage determination circuit can determine which contact is turned on because the amount of voltage drop is different. Since a signal is sent to the motor control circuit 41 based on the determination, the pump motor 11 and the hose reel motor 25 can perform predetermined operations.

[Effects of the Invention] As described above, the present invention provides the following excellent effects.

(1) Since the intrinsically safe power supply circuit is installed inside the hose processing case installed in the canopy, multiple electric wires or lines from the office to the hose processing case can be routed within one conduit, making it easier to conduct conduit construction. can be simplified.

(2) Ordinary nozzle position detection means can be used, no heavy explosion-proof structure is required, and weight can be reduced.

(3) Since the intrinsically safe power supply circuit is molded in resin, there is no risk of short-circuiting the general circuit on the input side.

(4) Therefore, the suspended oil supply system can satisfy both the simplification of construction and the safety aspect.

[Brief explanation of the drawing]

FIG. 1 is a side view of a fueling station implementing the present invention, FIG. 2 is a cross-sectional side view of a suspended refueling system implementing the present invention, and FIG. 3 is a block diagram showing an example of a control circuit implemented in the present invention. It is a diagram. 3...Hose processing case, 4...Refueling hose,
9...Control panel, 21...Hose reel, 25...
Hose reel motor, F1, F2...fuse,
T... Electric conduit, Z1, Z2... Zener diode, R1, R2... Resistor, 27... Nozzle position detection means, 29... Intrinsically safe power supply circuit.

Claims (1)

[Claims] 1. A suspended type refueling device in which a refueling hose is suspended such that it can be raised and lowered, and a hose processing device housing a refueling hose, a hose reel, a hose reel motor, and a nozzle position detection means is provided above the refueling position.
An intrinsically safe power supply circuit is installed in the hose processing device, which is a resin-molded circuit consisting of a fuse, a current-limiting resistor connected in series to the fuse, and a voltage-limiting Zener diode connected to the ground. 1. A suspended oil supply device, comprising: a nozzle position detection means connected to a control panel via the intrinsically safe power supply circuit.