JPS61152595A - Lubricating device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a refueling device that is capable of displaying and presetting the amount of refueling, amount of money, etc. (hereinafter referred to as refueling amount, etc.) at or near the refueling nozzle. In particular, the present invention relates to a refueling device that is capable of transmitting data while electrically insulating a signal transmission line.

[Prior art]

In general, a refueling system for refueling a vehicle, whether a fixed meter or a suspended meter, is connected to a flow meter installed in the middle of the piping and the piping via a hose. The pump is equipped with a control device for starting and stopping the pump and counting exhaustion signals from the flowmeter, and when the fuel nozzle is placed in the ready state for refueling sVc, the pump starts, It is configured to count the amount of oil supplied by the oil supply nozzle and display it on the display.

In a refueling device having such a basic configuration, for the convenience of the operator, a hand display is provided at the refueling nozzle to display the refueling amount, etc., and a preset switch is provided to preset the refueling amount, etc. It has been known.

However, the area near the refueling nozzle is an extremely dangerous area filled with explosive gasoline vapor (referred to as a Class 0 hazardous area under the Fire Service Act), and from the standpoint of fire prevention and disaster prevention, electrical equipment must be of zero-security explosion-proof construction. That is required. Therefore, when a control circuit consisting of an active circuit is built into a hand display or preset switch, a separate explosion-proof power supply is required for the control circuit's power supply and signal transmission line. In addition, when there are many types of signal transmission lines, there is a drawback that explosion-proof power supplies are required as many as the number of transmission lines to prevent cross-contact.

[Problem that the invention seeks to solve]

The present invention was made in view of the drawbacks of the prior art described above, and it supplies intrinsically safe power from a zero-safety power supply circuit to a handheld control device, and also provides a power supply circuit for a signal transmission line at the next stage of the intrinsically safe power supply circuit. A photoelectric conversion circuit is provided to drive both as an integrated circuit, and has a sufficient creepage distance between the signal transmission line and the signal transmission line of the weighing machine control device provided on the non-operational side. An object of the present invention is to provide a refueling device that can be connected via a serial data transmission line and can transmit serial data.

[Means for solving problems]

The present invention has been made in view of the above-mentioned problems.The present invention provides a hand-held control device that is installed in the middle of a refueling nozzle or hose and has a display function and a data setting function, and supplies an intrinsically safe power source to the control device. a signal power supply circuit provided on the output side of the intrinsically safe power supply circuit and connected to the signal transmission line of the hand control device; and a signal power supply circuit between the signal transmission line and the control device for the weighing machine body. It is characterized by comprising a photoelectric conversion circuit connected to the signal transmission line in an electrically insulated manner.

〔Example〕

Hereinafter, embodiments of the present invention will be described using a suspended weighing machine as an example, and the first embodiment will be described below.
This will be described in detail based on the figures.

First, FIG. 1 shows an overall configuration diagram of a refueling system according to this embodiment. A building 2 equipped with an office, etc. is installed on a refueling station site 1, and above the building 2 there is a ceiling, a canopy, a beam, etc. A high place 3 is formed.

4 is a pipe installed along the Ia store 2, one end of the pipe 4 opens into a tank 5 installed underground, and the other end is in a high place 3! /c is opened and connected to the hose elevator 6.

In the middle of the piping 4, a four-wheel drive unit 8 driven by a motor 7 and a flow meter 9 for measuring the amount of oil supplied are provided, and the flow meter 9 has a flow transmitter 1 for transmitting a flow signal.
0 is attached.

Reference numeral 11 denotes a hose whose one end is wound around a hose reel (not shown) within the hose lifting amount 6 and connected to the piping 4, and the other end of the hose 11 is suspended downward and has a A refueling nozzle 12 is provided. and,
The refueling nozzle 1 is rotated by rotating the hose reel by an elevator (not shown) in the hose elevator 6.
The position of the refueling nozzle 12 at this time can be detected by a position detection switch 13 provided in the hose elevator 6.

14 is the refueling nozzle! 2 or a hand control device installed on the hose 11 near the oil supply nozzle 12. The hand control device 14 has an oil passage inside as shown in FIG. The casing 15 includes a hand display 16 for displaying the amount of oil to be supplied, a preset switch 17 consisting of a numeric keypad for presetting the amount of oil to be supplied, and a switch for moving the refueling nozzle 12 from the refueling position C to the standby position B. Lift switch 18 to raise
and a lowering switch 19 for lowering the refueling nozzle 12 from the standby position B to the refueling position C. Further, inside the casing 15 are installed a processing circuit 2B, which will be described later with reference to FIG.
Transistor 30. A photocoupler 33 etc. is built-in. ζHere, the preset switch 17 has the data keys "o" to "9", "00", the clear key rACJ, the fixed amount preset key "V", the quantitative preset key "l", and the display inversion key. It has "↓". Note that the lowering switch 19 is provided with an operation sheet 19A for easy lowering operation.

Reference numeral 20 denotes a display mounted at a high place in the building 2 or other easily visible position for customers.The display 20 electrically displays the amount of refueling, etc. based on a count signal from a control device 21, which will be described later. Note that the location where the display 20 is to be installed is defined as a non-hazardous location, and the display 20 does not have an explosion-proof structure.

Next, Fig. 3 shows a functional block diagram of the control circuit used in this embodiment, and Fig. 4 shows a specific configuration diagram of the control circuit. The control device 21 is installed in a non-hazardous area, for example, in the display 20. As shown in FIG. 3, the metering control device 21 has a flow rate transmitter 10 on the input side. It is connected to the position detection switch 13, etc., and the output side is connected to the pump motor 7, the display 20, the upper and lower lifts, etc., and the signal transmission lines 22A, 22
It is connected to a photoelectric conversion circuit 39, which will be described later, via a signal transmission line 22 made up of B. .

Here, during normal refueling, the metering control device 21 controls the refueling nozzle 1 based on a signal from the filler lid detection switch 13.
2 is lowered from the standby position B, the I pump motor 7 is started, and when the refueling nozzle 12 is raised from the refueling position C, the I pump motor 7 is started.
a start/stop function that stops the pump motor 7; and a quantitative stop function that stops the pump motor 7 or metering valve (not shown) in a fixed amount when a preset value is reached in the case of preset oil supply; In addition to the usual display function that counts the flow rate signal from the flow rate transmitter 10 and displays it on the display 20, it also converts the data output to the hand control device 14 into a signal that can be transmitted serially, and also functions as a hand control function. It has a signal conversion function that converts the data serially transmitted from the device 14 into a processable signal.

23 is a DC stabilized power supply that is connected to a commercial power supply and has a built-in transformer with a touch prevention plate, a smoothing circuit, etc.; 24 is an intrinsically safe power supply circuit provided on the output side of the stabilized power supply 23; 24 is a fuse 25, a Zener diode 26.
26, a current limiting resistor 27, etc., and outputs an intrinsically safe power source that does not have the ability to ignite sparks and the like.

Next, 28 is a processing circuit including a CPU and the like provided in the hand control device 14.
B. The lowering switch 19 is connected, and it is also connected to the intrinsically safe power supply circuit 24 via power lines 29 and 29, so that the intrinsically safe power supply as a driving power source for the cough treatment circuit 28 is supplied. Here, the processing circuit 28 includes the preset switch 17,
A function of converting the signals from the rising switch 18 and the falling switch 19 into signals that can be serially transmitted and outputting them to a transmitting transistor 30 (described later), and converting serial transmission data input from a photocoupler 33 (described later) into a signal that can be displayed. It also has a function to display the information on the hand display 16.

30 is a transmitting transistor connected to the output terminal 32 of the processing circuit 28 via a resistor 31;
is normally set at the rONJ level, and performs a switching operation based on transmission data from the processing circuit 28 during signal transmission. 33 is a reception photocoupler connected to the input terminal 34 of the processing circuit 28 and connected in series with the transistor 30; the photocoupler 33 inputs serial transmission data received by photoelectric conversion to the processing circuit 28&C through a pull-up resistor 35; It is something.

Therefore, in this embodiment, the hand control device 14 includes a hand display 16, a preset switch 17, lift switches 18, 19, etc. shown in FIG. 2, as well as a processing circuit 28, a transmitting transistor 30, a receiving transistor It is composed of a photocoupler 33 and the like.

Next, 36 is a drive current (
This power supply circuit 3 is a constant current power supply circuit for generating loop current).
642. It is configured to include a PNP type transistor 37t, and the emitter and pace are connected to the intrinsically safe power supply circuit 24 via a power supply line 38.

Therefore, by supplying an intrinsically safe power supply with a substantially constant voltage from the single-wire safe power supply circuit 24, the collector current becomes a substantially constant current, and the constant current is transferred to the signal transmission line 45.
The light emitting diode can be driven with a constant amount of light during photoelectric conversion.

Further, 39 is a display 2 near the weighing machine control device 21.
0, the photoelectric conversion circuit 39 is connected to the signal transmission line 22A&C on the main weighing machine main body control device 21 side, and the transmitting transistor 40 and the light emitting diode 41 are connected to the light emitting diode 41. Hand control device 1 is installed opposite to this to ensure sufficient creepage distance.
A receiving phototransistor 42 consisting of a Darlington connection provided on the fourth side, a light emitting diode 43 connected in series with the phototransistor 42, and a light emitting diode 43 connected in series with the phototransistor 42.
and a receiving phototransistor 44 connected to the signal transmission line 22B on the control device 21 side to ensure a sufficient convex distance. Here, when transmitting data from the control device 21 side, the transmitting transistor 40 performs a switching operation based on the serial transmission signal of the control device 21, causing the light emitting diode 41 to emit light, and this light is transmitted to the phototransistor 42. This is done by receiving light. On the other hand, the hand control device 1
When transmitting signals from the 4 side, the phototransistor 44 receives the light emitted from the light emitting diode 43.

Furthermore, 45 is the hand control equipment 14. Constant current power supply circuit 36
, photoelectric conversion circuit 390 e)) A signal transmission line connecting a transistor 42 and a light emitting diode 43 in series is shown, and the signal transmission line 45 is a signal transmission line connecting a constant current power supply circuit 36 and a hand control value f14. Line 45 people 1
It consists of a signal transmission line 45B that connects the handheld control device 14 and the photoelectric conversion circuit 39, and a signal transmission line 45C that connects the photoelectric conversion circuit 39 and the constant current power supply circuit 36. Loop current is flowing. Here, since the hand control device 14 is provided near the refueling nozzle 12 and the photoelectric conversion circuit 39 is provided within the display 20, the constant current power supply circuit 36t--if also provided within the display 20 There is a power line 29,
The signal transmission lines 45A and 45B are bundled into one cable 47 and arranged along the hose IIK. In addition,
When the constant current power supply circuit 36 is attached to the local control device [14], the power supply line 29, the signal transmission line 45B,
45C as one cable and run it along the hose 11.

Thus, in this embodiment, the intrinsically safe power source from the mold cost power supply circuit 24 is supplied as a power source for driving the processing circuit 28, and the intrinsically safe power source is supplied to the constant current power source circuit 36 to provide a constant current to the signal transmission line 45. The -1 photoelectric conversion circuit 39 is connected between the light emitting diode 41 and the phototransistor 42, and between the light emitting diode 41 and the phototransistor 42.
3. A sufficient creeping pressure Wa is ensured between the phototransistors 44, and an electrically insulated state is ensured against creeping discharge and leakage magnetic flux. As a result, in the circuit shown in Fig. 4, the side indicated by the arrow A can be configured as a non-hoan system, and the side indicated by the arrow B can be configured as a heavy electric system, and abnormal current can flow from the non-hoan system to the heavy electric system B. There is no explosion-proof structure for the entire circuit.

The present embodiment is constructed as described above, and its operation will now be described.

First, the normal refueling operation will be described. In this case, the refueling nozzle 12 in the standby position B is lowered to the refueling position C by operating the lowering switch 19.

As a result, the processing device 2ε converts the falling switch signal into serial transmission data that can be transmitted according to a predetermined program, outputs this to the transmission transistor 30, and the transistor 30 switches the loop current of the signal transmission line 45. .

As a result, the light emitting diode 43 of the photoelectric conversion circuit 39 blinks and emits light, and the receiving phototransistor 44 receives this. Then, this received signal is received by the weighing machine main body control device 21 via the signal transmission line 22B, and the control device 2
1 converts the serial transmission data again and decodes the down switch signal.

At this time, the photocoupler 33 also operates, but the processing circuit 28 does not receive this as received data while data is being transmitted from the output terminal 32. In this way, the control device [21 rotates the lifting motor in the hose elevator 6 downward, moves the refueling nozzle 12 to the refueling position C, and also rotates the pump motor 7.
Start.

When the refueling worker inserts the refueling nozzle l2t into the fuel tank of the vehicle and opens the valve, gasoline from the underground tank 5 is supplied through the pipe 4, the outlet 8, the flow meter 9, and the hose 11. The amount of oil supplied at this time is measured by the flow meter 9, and the flow signal from the flow transmitter 10 is counted by the metering control device 21 and displayed on the display 20.

On the other hand, the control device 21 converts the counting results into transmittable serial transmission data at predetermined time intervals or predetermined flow rate intervals, and operates the transmitting transistor 40'fI to perform a switching operation. As a result, the light emitting diode r41 blinks and emits light, and the phototransistor 42 receives this light. For this,
The loop current of the signal transmission line 45 changes, the photocoupler 33 receives this, and inputs this received signal to the processing circuit 28 .

The processing circuit 28 converts the received serial transmission data into a displayable signal, outputs it to the hand display 16, and causes the hand display 16 to display the amount of refueling.

At this time, the light emitting diode 43 also blinks and emits light, but the control device 21 for the weighing machine main body does not receive this while the transmitting transistor 40 is switching and transmitting data.

Further, when refueling is completed, the refueling operator operates the lift switch 18t. As a result, the lift switch signal is received by the control device 21 in the same manner as described above, and the lifting motor is rotated upward to return the oil supply nozzle 12t to the standby position B, and the pump motor 7 is stopped. Thus,
Normal refueling work is completed.

Next, the preset oil supply operation will be described. In this case as well, the refueling nozzle 12t is lowered to the refueling position C in the same manner as described above, and the preset switch 17 is used to preset the amount of refueling desired by the customer.

As a result, the processing circuit 28 converts this preset value into transmittable serial transmission data, which is transmitted to the weighing machine main body control device 21 and also displayed on the handheld display 16 in the same manner as described above.

′ In this state, refueling is carried out, and the predetermined Bricera,
When this value is reached, the control device 21 stops the pump valve or the stop valve at a fixed amount, and performs preset refueling without excess or shortage. will be displayed.

The operation of the rice is not different from normal refueling, so it will be omitted.

In this embodiment, the control device 21 for the weighing machine main body, the photoelectric conversion circuit 39, etc. are described as being installed in the display unit 20, but they may also be installed in other non-hazardous locations such as in an office. The power supply circuit 24 may also be provided in an appropriate non-hazardous location such as within a power distribution board.

Furthermore, in the embodiment, the signal transmission line 45 has been described as a single series circuit including a single constant current power supply circuit 36, but it has two constant current power supply circuits to which intrinsically safe power is supplied from the intrinsically safe power supply circuit 24. one power supply circuit is provided with a transmitting transistor 30.
．． It is connected in series with the light emitting diode 43, and the other power supply circuit is connected in series with the transistor 42 and the photocoupler 33.
The transmitting side and the receiving side may have independent circuit configurations. If configured in this way, transmission and reception can be performed simultaneously, and the program for transmission and reception can be simplified.

Further, in the embodiment, a hanging type weighing machine is used as an example of the weighing machine, but it goes without saying that a fixed type weighing machine may also be used.

[Effects of the Invention] ゛The refueling device according to the present invention is as described in detail above, and the hand control device is driven by the mold power source,
The control device for the weighing machine main body and the handheld control device are connected through a full photoelectric conversion circuit, and the signal transmission line between them is driven by a power supply circuit connected to the incoming power supply circuit. Enables serial data transmission between devices, minimizes the number of intrinsically safe power supply circuits to one, and reduces the number of signal lines and power supply lines, allowing for inexpensive manufacturing. .

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of the refueling device according to this embodiment, Fig. 2 is an external view of the hand control device, Fig. 3 is a functional block diagram of the control circuit, and Fig. 4 is a specific configuration diagram of the control circuit. . 4...Piping, 8...-de/de, 9...Flowmeter, 1
DESCRIPTION OF SYMBOLS 1... Hose, 12... Refueling nozzle, 14... Hand control device, 16... Hand display, 17... Preset switch, 20... Display, 21... Viewing machine control device, 22゜45...signal transmission line, 24...
・Intrinsically safe power supply circuit, 28...processing circuit, 29.38...
・Power line, 36... constant current power supply circuit, 39...
Photoelectric conversion circuit, M...non-bonding type, B...bonding type.

Claims (1)

[Claims] A pump and a flow meter provided in the middle of the piping, a refueling nozzle connected to the piping via a hose, and a meter control device that starts and stops the pump and counts the flow rate signal from the flow meter. A refueling device comprising: a hand control device provided in the middle of the refueling nozzle or hose and having a display function and a data setting function; an intrinsically safe power supply circuit that supplies an intrinsically safe power source to the control device; A signal power supply circuit provided on the output side of the intrinsically safe power supply circuit and connected to the signal transmission line of the hand control device, and an electrical connection between the signal transmission line and the signal transmission line of the weighing machine main body control device. 1. A refueling device comprising a photoelectric conversion circuit that is electrically insulated and connected to the fuel supply device.