JPH08258900A - Vibration-sensitive power-cut-off device for oil supply device - Google Patents

Abstract

PURPOSE: To prevent oil from being supplied except that safety is confirmed and a return switch is operated 'by a method wherein a magnetic storage type contact is set to OFF when a vibration responsive switch is turned off and such condition is maintained. CONSTITUTION: When an impact is exerted on a casing of an oil supply device due to an earthquake or collision of car, a vibration responsive switch 25 is set from ON to OFF, and hence a set coil S is demagnetized. As a result, the exciting force of a reset coil R becomes larger so that a first and second contacts SR1, SR2 are set to OFF and thereafter such conditions are maintained. And at the same time, since the contact SR2 is set to OFF, a power relay 41 also is set to OFF and hence power to a control device 8 is cut off and a motor control switch 10 also is set to OFF and supply of liquid is suspended. As a result, even if power failure is eliminated and power supply is restarted, suspended condition can be maintained. However, if a return switch 29 is depressed under such conditions, the set coil S is excited and the contacts SR1, SR2 are set to ON and oil can be supplied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration power supply cutoff device for an oil supply device, which cuts off the supply of electric power to an oil supply mechanism and a control device when it receives an impact due to an earthquake or a collision of an automobile.

[0002]

2. Description of the Related Art In a gas filling station, a vibration responsive device that is activated by vibration as disclosed in Japanese Patent Laid-Open No. 60-193894, for example, is provided in case a shock is applied to the fueling device due to an earthquake or a collision of an automobile. A vibration-type power interruption device is used in which a switch and a relay forming a self-holding circuit are connected in series and connected in parallel to a power supply line, and when the vibration response switch is turned on, the power supply to the oil supply device is cut off. ing. According to this, when the vibration response switch is actuated by the vibration and the self-holding circuit is turned on, the contact of the relay can be maintained in the off state and the power cutoff state can be maintained, but when the main power supply is cut off in this state, When the self-holding circuit is turned off and the power is restored next time, if the vibration response switch is not in a state of detecting vibration, refueling is possible. Therefore, in the event of a temporary power outage due to an earthquake, there is a problem that refueling becomes possible without confirmation of safety.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and its purpose is to confirm safety and not operate a return switch when vibration is detected. It is an object of the present invention to provide a vibration-type power cutoff device for a lubrication device that maintains a state in which refueling is impossible.

[0004]

In order to solve such a problem, in the present invention, the set coil, the reset coil, and at least the set coil are turned on when excited, and only the reset coil is excited. When the set coil and the reset coil are simultaneously deenergized, the relay is turned off, and when the set coil and the reset coil are simultaneously deenergized, the on state of the set coil is magnetically held. And a vibration response switch whose contact is turned off by vibration, and a power relay having a contact for cutting off power, and the set coil, the first magnetic memory type contact, and the vibration response switch are connected in series. And a reset coil, and a series circuit including the second magnetic memory type contact and the operating coil of the power relay. Connected in parallel to the respective power supply line, also the return switch connected in parallel to said first magnetic storage type contact, and to provide power to the drive means via the contacts of the power relay.

[0005]

When the vibration response switch is turned off, the excitation by the set coil is lost, so the first and second magnetic memory contacts are turned off by the reset coil, and thereafter the set coil is excited by the operation of the return switch. It remains off until done. In addition, when the main power is cut off and both the set coil and the reset coil are deenergized at the same time, the ON state by the set coil is magnetically stored, and the power relay can be turned on by simply turning on the main power switch again. Turns on and supplies power.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an embodiment of an oil supply device to which a power cutoff device according to the present invention is applied. In the figure, reference numeral 1 is a liquid feed pump driven by a pump motor 2, and a riser pipe 3 is used. The fuel oil is sent from an underground tank (not shown).

A flow meter 4 has a liquid feed pump 1 at the inlet.
And a refueling nozzle 6 connected to the outflow port via a hose 5, and outputs from the flow rate pulse signal transmitter 7 a flow rate pulse signal that corresponds to the amount of oil refueled from the nozzle 6 to the automobile fuel tank. Is.

Reference numeral 8 denotes a control device, which outputs a signal to the motor control switch 10 in response to an oil supply request signal from the nozzle switch 9 to supply the power of the power line 11 to the pump motor 2.
Also, the flow rate pulse output by refueling is integrated to display the refueling amount on the display 12, and the motor control switch 10 is turned off by the refueling stop signal from the nozzle switch 9 to cut off the power supply to the pump motor 2. It works.

Reference numeral 20 denotes a power supply shutoff device which is a feature of the present invention. The power supply device 20 is housed in the box 14 of the main body of the fueling device, and in this embodiment, a power supply line 1 for supplying electric power for driving the control device 8.
Connected to 3.

FIG. 2 shows an embodiment of the above-mentioned power cutoff device, in which a screw 2 is attached to a box 14 of the main body of the oil supply device.
A vibration-responsive switch 25, connectors 26 and 27, a relay unit 28, which will be described later, and a return switch 29 are housed in a pressure-proof explosion-proof case 24 that can be fixed by 3, 23.
The power supply line 13 is configured to be retractable via the packings 30 and 31.

The vibration responsive switch 25 is configured as a switch that switches from an on state to an off state when a vibration is detected. In this embodiment, a bottom 35a is a conical container 35 made of a conductive material. The electrode needle 38 is fixed via an insulating material 37 so that only the tip is immersed in the conductive liquid 36, for example, mercury.

According to this structure, the container 35 is always provided.
Although the electrode needle 38 and the electrode needle 38 are short-circuited by the conductive liquid 36, when the conductive liquid 36 shakes and separates from the electrode needle 38, the container 35 and the electrode needle 38 are electrically connected. Is opened and turned off.

FIG. 3 shows an embodiment of the above-described power cutoff device. In the figure, reference numeral 40 is a magnetic memory type relay which is a main part of the relay unit 28, and includes a set coil S, a reset coil R and a magnetic field. The first and second contact points SR1 and SR2 that can maintain the previous state are provided.
1, SR2 is switched from off to on when at least the set coil S is excited, and the reset coil R
When only one is excited, it is turned off, and when it is deenergized at the same time, the on state by the set coil S is magnetically stored.

The set coil S is connected to the first contact SR1 and the vibration response switch 25 in series, and then the power supply line 13 is connected.
And the reset coil R is connected to the power line 13 in parallel.
Are directly connected in parallel.

A normally open return switch 29 is connected in parallel to the first contact SR1, and also has a second contact SR.
2 is the power supply line 1 via the exciting coil A of the power relay 41
3 are connected in parallel. The control device 8 is connected to the power supply line 13 via the contacts A1 and A2 of the power relay 41 so as to be supplied with operating power.

In this embodiment, when the refueling device is installed, the main power switch W of the office is turned on to operate the operation button 2.
When the return switch 29 is turned on by 2, the set coil S is excited by being supplied with power from the power supply line 13 via the vibration response switch 25 and the return switch 29, and is excited at the same time when the original power switch W is turned on. Regardless of the excitation of the reset coil R, the first and second contacts SR1 and SR
Both 2 and 1 are turned on preferentially.

As a result, the set coil S is supplied with electric power through the vibration response switch 25 and the first contact point SR1, so that the set coil S maintains the ON state regardless of whether the return switch 29 is ON or OFF, and is in the so-called self-holding state. Becomes

At the same time, since the power relay 41 is excited by turning on the second contact SR2, the operating power is supplied to the control device 8 via the contacts A1 and A2 of the power relay 41 to enable refueling.

In this state, if an impact is applied to the box 14 of the oil supply device due to an earthquake or a collision of a vehicle, the vibration response switch 25 is switched from on to off, so that the set coil S is deenergized. As a result, the exciting force of the reset coil R is overcome, the first and second contacts SR1 and SR2 are turned off, and the off state is maintained thereafter.

At the same time, since the power relay 41 is also turned off by turning off the second contact SR2, the power supply to the control device 8 is cut off, the motor control switch 10 is also turned off, and the liquid transfer is stopped.

For confirmation, the main power switch W is turned off to perform an inspection, and when it is confirmed that there is no abnormality, the main power switch W is turned on.

In this state, the first and second contacts SR1 and S
Since both R2 are off, only the reset coil R is excited, so that the contacts SR1 and SR2 still remain off.

Therefore, even if the power is inadvertently turned on or the power supply due to the earthquake is resolved and the power supply is restarted, the control device 8 is not supplied with power and is in the hibernation state. Can be maintained.

When the return switch 29 is pressed while the power is on, the set coil S is excited as described above, so that the contacts SR1 and SR2 are turned on regardless of the excitation state of the reset coil R. As a result, the contacts A1 and A2 of the power relay 41 are turned on, and the operating power is supplied to the control device 8 to enable refueling.

After the day's business is over, the former power switch W
When the switch is turned off, the set coil S and the reset coil R are deenergized at the same time, so that the contacts SR1 and SR2 magnetically maintain the state before the power is cut off, that is, the on state.

When the main power switch W is turned on again before business, the set coil S is excited at the same time as the reset coil R via the first contact SR1 which has memorized the ON state, so that the contacts SR1 and SR2 are in the state. The ON state is maintained without changing. Therefore, the return switch 2
The electric power relay 41 is turned on through the second contact point SR2 and the fuel can be supplied without the operation of 9.

In the above embodiment, the vibration response switch 25 is actuated to turn on / off the electric power to the control device 8. However, the electric power to the motor 2 is directly provided through the power line 11. Obviously, the same effect can be obtained even if the power is cut off.

[0028]

As described above, according to the present invention, the set coil, the reset coil, and at least the set coil are turned on when they are excited, and only the reset coil is turned off when they are excited. A magnetic memory type relay having first and second magnetic memory type contacts for magnetically retaining the ON state of the set coil when the reset coil and the reset coil are deenergized, and a vibration response in which the contacts are turned off by vibration. A series circuit including a switch and a power relay having a contact for cutting off power, a set coil, a first magnetic memory type contact, and a vibration response switch are connected in series, a reset coil, and a second magnetic memory Type contact and a series circuit of an operating coil of the power relay are respectively connected in parallel to the power supply line, and a return switch is connected to the first magnetic memory type contact. Are connected in parallel to supply the electric power to the driven means through the contact of the power relay. Therefore, when the vibration response switch is turned off, the excitation by the set coil is lost and the first and second When the magnetic memory type contact is turned off, and the set coil can be maintained in the off state until the set coil is excited by the operation of the return switch, and the set power and reset coil are both deenergized at the same time because the main power supply is cut off. The magnetically stores the on-state by the set coil, and the power relay can be turned on and power can be supplied only by turning on the main power switch again. Further, even if the power failure due to the earthquake is resolved, it is possible to prevent the power from being turned on carelessly until the confirmation is completed.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of an oil supply device using a power interruption device of the present invention.

FIG. 2 is a diagram showing an internal structure of the above power shutdown device.

FIG. 3 is a diagram showing the configuration of the same power cutoff device.

[Explanation of symbols]

 2 motor 11 power line 12 control switch 13 power line 20 power cutoff device 25 vibration response switch 29 return switch 28 relay unit 40 magnetic memory type relay 41 power relay W source power switch

Claims (4)

[Claims] 1. A vibration response switch in an explosion-proof box,
A vibration power cut-off device for an oil supply device, which is integrally housed with a relay unit. 2. A set coil, a reset coil, and at least when the set coil is excited, it is turned on, and when only the reset coil is excited, it is turned off, and the set coil and the reset coil are simultaneously de-energized. At this time, a magnetic memory type relay having first and second magnetic memory type contacts that magnetically retains the ON state by the set coil, a vibration response switch whose contacts are turned off by vibration, and electric power are cut off. A series circuit comprising a power relay having a contact, the set coil, the first magnetic memory type contact, and the vibration response switch being connected in series, the reset coil, and the second magnetic memory type contact. And a series circuit of the operating coil of the power relay are respectively connected in parallel to the power supply line, and returned to the first magnetic memory type contact. 2. The vibration power source cutoff device for an oil supply device according to claim 1, wherein switches are connected in parallel to supply electric power to the driven means via the contacts of the power relay. 3. The vibration sensing device for a fueling apparatus according to claim 2, wherein the vibration response switch, the magnetic memory type relay, the power relay, and the return switch are housed in a pressure-proof explosion-proof box, and the return switch can be operated from the outside. Power interruption device. 4. The vibration-responsive switch has a conductive container having a conical bottom portion, a conductive liquid contained in the bottom portion, and is constantly immersed in the conductive liquid to short-circuit with the conductive container. The vibration-sensitive power source cutoff device for an oil supply device according to claim 2, which is constituted by an electrode which is opened by vibration.