JP3387125B2 - Internal pressure explosion-proof printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal pressure explosion-proof printer provided in a refueling device. 2. Description of the Related Art Electric equipment used in an environment filled with flammable gas, such as an LPG station or a gas station, is housed in a casing whose internal pressure is increased by clean air. A so-called internal pressure explosion-proof structure is used to prevent flammable gas from igniting even if a spark or the like occurs.
As such a device, for example, Japanese Patent Publication No. 1-32120 discloses an internal pressure explosion-proof electric device in which residual charges in a power supply circuit are rapidly and forcibly discharged before the internal pressure explosion-proof air pressure falls to an explosion-proof reference value. Safety device is disclosed. [0003] However, such an internal pressure explosion-proof electric device must always supply new air to the casing to maintain the pressure higher than the atmospheric pressure. In particular, the refueling data printing printer
Since the outlet of the port is open to the atmosphere, air is constantly leaking, and it is costly to continue to supply air that maintains a constant pressure in the casing. In addition,
Since the paper is exposed to the leaking air for a long time, air dehumidifying equipment is required, and the equipment cost increases. In particular, at a refueling station where the number of times of refueling per day is small, the economic burden due to the supply of air even during non-refueling is large. Accordingly, an object of the present invention is to provide an internal pressure explosion-proof printer capable of reducing equipment costs and reducing running costs. [0005] To achieve the above object, an internal pressure explosion-proof printer of the present invention is an internal pressure explosion-proof printer of a refueling apparatus in which a printer for printing refueling data on a slip is housed in an internal pressure explosion-proof chamber. An air supply means for supplying a clean gas into the internal pressure explosion-proof chamber by a refueling request signal, and stopping the gas supply by a printing end signal of the printer, and a printer drive for printing and driving the printer by a refueling end signal. have a means, residence documents in the document outlet of said pressure proof爆室
In addition to providing a lock room, a door lock
And a door sensor are provided, and when the door sensor is closed,
Only refueling is possible, and the door lock is
The door is locked by the
And the internal pressure explosion-proof chamber
The print enable signal of the printer
Is output . According to the present invention, a clean gas is supplied from the air supply means to the internal pressure explosion-proof chamber containing the printer at a constant pressure for a fixed time only at the time of refueling. In addition, the running cost can be reduced, and the air can be blown for a short time, so that the equipment for preventing the moisture absorption of the printing paper is simplified and the equipment cost is reduced. An embodiment of the present invention will be described below in detail with reference to an embodiment shown in the drawings. FIG. 2 is an overall schematic diagram of an oil supply device provided with an internal pressure explosion-proof printer according to an embodiment of the present invention. Referring to FIG. 1, an oil supply device 10 according to this embodiment is shown.
Is provided in a case 10a forming the main body, and controls a controller 11 for controlling the operation of the entire apparatus, a refueling mechanism 12 for supplying a predetermined fuel, a display 13 for displaying refueling data, and printing refueling data. The printer unit 14 includes an air supply unit 15 that supplies clean air to the printer unit 14. The refueling mechanism 12 includes a refueling pump 17 driven by a pump motor 16 disposed in a case 10a, a flow meter 18 for measuring a refueling amount, a refueling hose 20 having a refueling nozzle 19 at a tip end, and the like. . The suction port side of the refueling pump 17 is connected to a pipe communicating with a fuel tank provided underground, and the discharge port side thereof is connected to a flow meter 1.
8 is connected to one end of the oil supply hose 20.
The refueling hose 20 is led out from the inside of the case 10a of the main body to the outside through the side face, and the refueling nozzle 1 is connected to the other end.
9 are attached. The refueling nozzle 19 is detachably mounted on a nozzle holder 21 projecting from a side surface of the case 10a. A nozzle switch 22 that is turned on / off by the attachment / detachment of the refueling nozzle 19 is provided near the nozzle hook 21. When the nozzle switch 22 is on, the pump motor 16 is operated by a signal from the control device 11, and pumps fuel oil from a fuel oil tank provided underground. The flow meter 18 includes a flow pulse transmitter 23
Is connected to the control device 11 through the
Is a display 13 for displaying refueling data, and a printer unit 1.
4 and the air supply unit 15. FIG. 1 is a diagram illustrating the configuration of a printer unit and an air supply unit according to an embodiment of the present invention. Parts corresponding to those in FIG. 2 are denoted by the same reference numerals. In FIG. 1, a printer section 14 is configured such that a printer 32 for printing refueling data on paper fed from roll paper 31 is housed in an internal pressure explosion-proof chamber 33. The printer 32 is controlled by a printer control device 34 to which refueling data and signals from the nozzle switch 22 are input, and has a printer end detection sensor 35 for detecting the end of printing by the printer 32. The internal pressure explosion-proof chamber 33 is formed in a size to accommodate the roll paper 31 and the printer 32, and is formed with a slip exit 37 formed in a thin slit shape for discharging a slip 36 printed by the printer 32. . A printed slip 3 is provided in a portion of the internal pressure explosion-proof chamber 33 where the slip outlet 37 is formed.
A slip staying chamber 38 for staying 6 is connected. The slip holding chamber 38 has a door 39 on one side thereof for releasing the slip holding chamber 38 and taking out the printed slip 36.
A door switch 40 for detecting the open / closed state of the door 39 and a door lock 41 for locking the door 39 are provided. The detection signals of the printer end detection sensor 35 and the door switch 40, and the internal pressure explosion-proof chamber 33
A signal from the pressure switch 43 for detecting the internal pressure is given to the printer controller 34. Also, door lock 4
1 is controlled by a signal provided from the printer control device 34. The air supply section 15 is a section for supplying pressurized air to the internal pressure explosion-proof chamber 33. For example, the air supply section 15 is disposed at a blower 42 for taking in clean air at a relatively high place of the refueling device 10 or at a remote place. When the air is supplied from the air supply source via a pipe, the printer is provided with an electromagnetic valve and is controlled by the printer control unit 34. FIG. 3 is an overall block diagram for explaining the structure of the oil supply device according to the embodiment of the present invention. 1 and 2 have the same reference numerals. In FIG. 1, the control device 11 includes a gate 51 which is opened by a signal indicating that the door 39 of the door switch 40 is closed, and an ON signal from the nozzle switch 22 transmitted through the gate 51 to the pump motor 16. And the pump motor 16 is turned on by the off signal of the nozzle switch 22.
Motor driving means 52 for stopping the operation, counting means 53 for accumulating the output pulses of the flow rate pulse transmitter 23, and refueling data output from the counting means 53 on the display 13
And a printer control unit 34 for controlling the printer 32, the blower 42, and the door lock 41 based on signals from the pressure switch 43 and the print end detection sensor 35, and the like. The counting means 53
Resets the previous numerical value displayed so far by the ON signal of the nozzle switch 22. The printer control unit 34 counts a predetermined time from a signal indicating a predetermined pressure from the pressure switch 43, and a logical product of the predetermined time elapsed signal of the timer 61 and the OFF signal of the nozzle switch 22. Circuit 62, printer driving means 63 for driving the printer 32 for printing the refueling data from the counting means 53 with the output of the AND circuit 62, and an ON signal of the nozzle switch 22 for driving the print end detection sensor 35 The blower drive means 64 stops the blower 42 by the end signal, and the door lock drive means 65 locks by the ON signal of the nozzle switch 22 and releases the door lock 41 by the end signal of the print end detection sensor 35. FIG. 4 is a flowchart for explaining the processing operation of the embodiment of the present invention. In FIG. 1, first, when the refueling nozzle 19 is removed from the nozzle hook 21 in the normal state, that is, with the door 39 closed, the nozzle switch 22 is turned on and a refueling request signal is issued (ST11). Since the door 39 is now closed and the gate 51 is open (ST12), the counting means 53
Clear previous lubrication data (return to zero) and set pump motor 1
6, the door lock 41 is locked, and the blower 42 is driven (opened in the case of a solenoid valve) (ST13). next,
When refueling is started and a pulse is input from the flow pulse transmitter 23 (ST14), the counting means 53 counts the pulses and displays refueling data on the display 13 (ST15).
When the refueling is finished and the refueling nozzle 19 is put on the nozzle hook 21, the nozzle switch 19 is turned off, and when the refueling end signal is issued (ST16), the pump motor 16 is turned off (ST17). On the other hand, when the nozzle switch 22 is turned on, the blower 42 is driven, clean air is sent to the internal pressure explosion-proof chamber 33, and the internal air pressure gradually increases, and the pressure switch 4
3, it is determined whether the pressure has reached the predetermined pressure. When the predetermined pressure has been reached and the timer 61 has been started and a predetermined time has elapsed (ST18), the AND driving circuit 62 outputs the printer driving means 63.
A print signal is output to the printer 32, a refueling slip is issued by the printer 32 (ST19), and the blower 42 is stopped (closed in the case of a solenoid valve) by a print end signal from the print end detection sensor 35 (ST20). Then, the door lock 41 is released (ST21). FIG. 5 shows the relationship between the pressure in the internal pressure explosion-proof chamber and time. In the internal pressure explosion-proof chamber 33, when the blower 42 is driven, clean air is sent, and the internal pressure gradually increases to a predetermined constant level. When the pressure (P) is reached (at time A), the pressure switch 43 is operated, the timer 61 is started, and when the time set by the timer 61 (time B) elapses, the printer 32 can be driven. That is, when air is sent to the internal pressure explosion-proof chamber 33 to have a constant pressure and a certain time has elapsed, the internal air is scavenged and replaced with clean air containing no combustible gas. According to the above-described configuration, the printer 32 is housed in the internal pressure explosion-proof chamber 33, and the blower 42 is driven during refueling to supply clean air to the internal pressure explosion-proof chamber 33 to increase the internal pressure. After a lapse of time, the air inside is replaced with clean air containing no flammable gas, and then the printer 32 is operated. The door 39 for taking out the slip 36 is unlocked.
Therefore, the blower 42 is operated only when refueling and the printer 32 is operated.
By increasing the pressure of the internal pressure explosion-proof chamber 33 containing
The inside air passes through the slip exit 37 and stays in the slip chamber 38.
Flows through the gap of the door 39 and the like to the outside, and replaces the inside of the internal pressure explosion-proof chamber 33 with clean air. An explosion-proof effect of preventing ignition of combustible gas can be obtained. In addition, since a short time air supply during refueling is sufficient, equipment for preventing moisture absorption of printing paper is simplified, running costs are reduced without wasting air, and the internal pressure is improved as compared with the conventional seal. The explosion-proof room 33 is not required, and the cost can be reduced. Although the present embodiment has been described with respect to an example in which the slip retention chamber 38 is connected to the portion where the slip exit 37 is formed, the internal pressure explosion-proof chamber 33 in which the printer 32 is stored during refueling.
The configuration is not limited to the embodiment as long as it can supply clean air to the inside at a constant pressure for a fixed time. As the pressure and time of this air, values compatible with internal pressure explosion protection are adopted. In the air supply section 15 of the present embodiment, air is supplied by driving the blower 42 (or opening the electromagnetic valve), but at least supply of clean air or gas such as nitrogen gas is performed. Any means can be used. Further, the example in which the print completion of the printer 32 is detected by the print completion detection sensor 35 has been described. However, the refueling data in the printer control device 34 and the like can be determined by computer software. As described above in detail, according to the present invention, only when refueling, clean gas is supplied from the air supply means to the internal pressure explosion-proof chamber containing the printer at a constant pressure for a fixed time. Therefore, explosion-proof effect can be obtained, unnecessary air supply during non-refueling time can be prevented, running cost can be reduced, and equipment for preventing moisture absorption of printing paper, etc. This has the effect of simplifying and reducing equipment costs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a configuration of a printer unit and an air supply unit according to an embodiment of the present invention. FIG. 2 is an overall schematic diagram of a fueling apparatus provided with an internal pressure explosion-proof printer according to an embodiment of the present invention. FIG. 3 is an overall block diagram illustrating a configuration of a fueling device according to an embodiment of the present invention. FIG. 4 is a flowchart illustrating a processing operation according to the embodiment of the present invention. FIG. 5 is a diagram showing a relationship between pressure and time in an internal pressure explosion-proof chamber according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 10 Refueling device 11 Control device 12 Refueling mechanism 13 Indicator 14 Printer unit 15 Air supply unit 18 Flow meter 19 Refueling nozzle 20 Refueling hose 22 Nozzle switch 23 Flow rate pulse transmitter 32 Printer 33 Internal pressure explosion-proof chamber 34 Printer control Device 36 Slip 37 Slip exit 38 Slip retention chamber 39 Door 40 Door sensor 41 Door lock 61 Timer 63 Printer driving means 64 Blower driving means 65 Door locking means

Claims (1)

(57) [Claims 1] In an internal pressure explosion-proof printer of a refueling apparatus in which a printer for printing refueling data on a slip is stored in an internal pressure explosion-proof chamber, a clean gas is supplied into the internal pressure explosion-proof chamber by a refueling request signal. and air, and possess a blowing means for stopping the air supply of the gas by the print end signal of the printer, the fueling completion signal and a printer driving means for printing driving the printer, before
With the establishment of a slip retention room at the exit of the slip of the internal pressure explosion-proof chamber
Then, a door lock and a door sensor are attached to the door of the slip retention room.
Provided, it is possible to refuel only when the door of the door sensor is closed,
The door is locked by the door lock at the refueling request signal
And start the air supply by the air supply means.
If the pressure in the explosion-proof chamber exceeds a certain value for a certain period of time
An internal pressure explosion-proof printer, which outputs a print enable signal of the printer.