JPH09110099A - Oil feeder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate danger of fire or the like and the need for security measures such as proofing against explosion, by providing a gas-compressing means and, on the other hand, an oil feed means which feeds oil by the use of compressed air, fed directly from the gas-compressing means, and by means of the direct reciprocation of a pressure feed means. SOLUTION: A tank opening 1A is made in the top of an underground tank, and a hole 7 having particular capacity which faces the top of the tank opening 1A is made in underground above the underground tank 1, and a pump 3 which is a diaphragm type, air drive type, and capacity-variable type is set in this hole 7. To this pump 3, a compressed-air supply pipeline 8, suction pipe 9, and oil feed pipe 2 are connected. Therefore, because a direct power source to feed oil to a meter 16 is air and such an ignition source as an electric motor does not exist in a dangerous area, there is no danger of fire or the like, and this eliminates the needs for proofing against explosion and various security measures. Additionally, a relief mechanism is made unnecessary and this eliminates wastage of consumption power and the need for relief pressure adjustment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refueling device installed in a refueling facility of a gas station such as a gas station, and more particularly to a technique relating to a refueling pump system to be used and its installation position.

[0002]

2. Description of the Related Art Conventionally, at gas stations and the like,
A plurality of weighing machines that measure oil and supply oil from a refueling nozzle are installed, and inside each weighing machine, a suction pump driven by an electric motor together with a flow meter and an indicator, that is, an electric motor and a suction pump. Incorporating an electric pump unit consisting of, the oil in a tank buried underground is sucked up by the electric pump unit, and the sucked oil is supplied to the automobile or the like from the refueling nozzle (Actual Publication No. 39). No. 34012).

However, in such a conventional refueling device for a gas station or the like, in order to prevent ignition by the electric motor, the electric motor needs to have an explosion-proof structure, and a flow meter is provided inside each weighing machine. In addition to the above, there is a problem that the structure of each metering machine becomes complicated and the size thereof becomes large because the electric pump unit and the bubble separation device are incorporated.

In view of the above-mentioned prior art, a tank buried underground, that is, an underground tank, contains an electric pump unit including an electric motor and a suction pump, and a plurality of weighing units installed from this pump. Proposing a technology that simplifies the structure of each weighing machine and miniaturizes it by abolishing the configuration that electric pump unit is built in each weighing machine by sending oil to each machine (See JP-A-48-49014).

[0005]

However, such a conventional oil supply device has the following problems. That is, the conventional oil supply device has the following problems because the electric pump unit is built in the tank. (1) In an oil supply device using an electric pump unit, an explosion source is required because an ignition source called an electric motor is provided in a dangerous place. (2) Various safety protection measures are required for the same reason as above. (3) Refueling is not possible during a power failure. (4) Since a constant amount is constantly discharged when the pump is driven,
Relief mechanism (passage) is required, waste of power consumption,
It is necessary to adjust the relief pressure of the relief mechanism (even if the electric pump unit is built into the weighing machine, the relief mechanism is also required). (5) In order to prevent the pump temperature from rising, it is necessary to take measures to prevent idling.

As described above, in the conventional oil supply device, the cost is soared for the above reason, and the cost advantage which is the original purpose is lost. (6) Underground tanks at gas stations are steadily increasing in size in the future, and conventional electric pump units have a limited head, which cannot be accommodated. Therefore, in view of the above conventional problems, the present invention eliminates factors such as various safety protection measures that increase the cost in the refueling device by improving the method of the refueling pump to be used and the installation position thereof. It is an object to increase the cost advantage and to easily cope with the increase in the size of underground tanks in gas stations.

[0007]

Therefore, the invention according to claim 1 is an underground tank which is buried in the ground and stores oil therein, an oil feed passage connected to the underground tank, and the oil feed passage. An oil feeding means that is interposed in an oil passage and that feeds the oil stored in the underground tank; an oil feeding nozzle that is connected to a downstream end of the oil feeding passage and that discharges the oil to the supply target portion; A measuring unit that is interposed in the oil feed passage and that measures the flow rate of the circulating oil, and is provided with a gas compression unit, while the oil feed unit is provided with a pressure feeding unit of the oil. An oil supply device characterized in that the compressed gas sent directly from the gas compressing means reciprocates the pressure sending means to send oil.

In the invention according to claim 2, the oil feeding means is
It is characterized by being a diaphragm type air-driven variable displacement pump. The invention according to claim 3 is characterized in that an accumulator is connected to the oil feed passage on the downstream side of the oil feed means.

In the invention according to claim 4, the oil feeding means is
It is characterized by being built inside the underground tank. The invention according to claim 5 is characterized in that the oil feeding means is arranged underground outside the underground tank. The invention according to claim 6 is characterized in that the oil feeding means is built in a weighing machine that includes at least a flow meter and an indicator to measure the oil and feed the oil from a fueling nozzle.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. First, a first embodiment of the present invention will be described based on FIG. That is, in this figure, for example, an oil supply device used at a gas station is an underground tank 1 which is buried in the ground and stores oil therein, and an oil supply pipe as an oil supply passage connected to the underground tank 1. 2, an oil feeding means (a pump 3 described later) for feeding the oil stored in the underground tank 1 that is interposed in the oil feeding pipe 2, and connected to the downstream end of the oil feeding pipe 2 to feed the oil. It is configured to include an oil supply nozzle 4 that discharges and supplies to an oil supply tank of an automobile serving as a supply target portion, and a flow meter 5 that is interposed in the oil supply pipe 2 and that serves as a measuring unit that measures the flow rate of circulating oil. .

The oil feeding means is provided with an oil pressure feeding means, and the compressed air directly fed from the compressor 6 as a gas compressing means reciprocates the pressure feeding means to feed the oil. In the embodiment, a diaphragm type air-driven variable displacement pump (hereinafter simply referred to as a pump)
It consists of 3. The configuration of the pump 3 and its characteristics will be described later.

To explain this structure in detail, a tank port 1A is provided on the upper surface of the underground tank 1, and a hole of a predetermined volume facing the upper surface of the tank port 1A is formed in the ground above the underground tank 1. 7 is formed, and the pump 3 is installed in the hole 7. A compressed air supply pipe 8, a suction pipe 9 and an oil feed pipe 2 are connected to the pump 3.

The suction pipe 9 is inserted into the underground tank 1 from the tank opening 1A. An accumulator 10 is provided at a position near the pump 3 on the oil feed pipe 2. The compressed air supply pipe 8 is connected to the compressor 6
In the pipe 8, a volume tank 11, a pressure reducing valve 12, and an electromagnetic valve 13 for air are provided in this order on the downstream side of the compressor 8.

A silencer 15 is provided in the exhaust pipe 14 connected to the pump 3. On the other hand, a plurality of weighing machines 16 are provided. Each weighing machine 16 is provided with a pair of branch pipes 2A and 2B that branch from the oil feed pipe 2 and extend, and the branch pipes 2A and 2B are sequentially arranged from the downstream side to the upstream side in the solenoid valve for the weighing machine. A strainer 17, a strainer 18, and the flow meter 5 are interposed, and the refueling nozzle 4 is connected to the downstream end portion.

Further, each weighing machine 16 is provided with a display 19 for displaying the amount of oil supply measured by the flow meter 5. Further, the following components are provided as a control system for controlling the drive of the pump 3 to control the oil supply from the oil supply nozzle 4. That is, the underground tank 1 is provided with a liquid level sensor 20 for detecting the liquid level in the tank 1. The sensor portion 20A of the liquid level sensor 20 is inserted into the underground tank 1 from a tank port 1B provided on the upper surface of the underground tank 1 so as to hang down.

In the ground above the underground tank 1, the tank mouth 1
A hole 21 having a predetermined volume facing the upper surface of B is formed,
The body 20B of the liquid level sensor 20 is installed in the hole 21. The detection signal from the liquid level gauge sensor 20 is connected to a liquid level gauge control unit 22 via a signal line A, and the liquid level gauge control unit 22 is connected to a liquid level gauge display 23 via signal lines B and C. Control device 24
Connected to.

Further, the control unit 24 is provided with signal lines D and E.
Solenoid valve for air 13 of the compressed air supply pipe 8 via
And a pair of weighing machine solenoid valves 17 of each weighing machine 16 are connected to each other and are provided on a hook portion of the weighing machine 16 via a signal line F, and the fueling nozzle 4 is detached from the hook portion. -A switch 25 that is turned on / off by hanging is connected.

Next, specific configurations of the above-mentioned components will be described in more detail. The compressor 6 is a device for compressing and holding air by piston drive, and functions as a drive source of the pump 3 as described above. The volume tank 11 is a tank for holding compressed air, and is used as an auxiliary tank when the number of weighing machines 16 is large and the capacity of the compressor 6 cannot secure a sufficient amount of air.

The pump 3 is constructed so that the air chamber a and the liquid chamber b are separated by a diaphragm c, and the compressed air is sent into the air chamber a so that the diaphragm c repeats a reciprocating motion to suck and discharge the liquid. As shown in FIG. 5, the degree of reciprocation changes as follows according to the magnitude of the pressure loss of the oil feed pipe 2. Large pressure loss → small number of reciprocations per constant time Small pressure loss → large number of reciprocations per constant time The accumulator 10 is called a tranquilizer,
This is a device for suppressing the pulsation generated in the oil feed flow of the diaphragm type air driven variable displacement pump 2 by its air pressure.

[0020] The pressure reducing valve 12, the air pressure of the compressor 6 (e.g., 9~10kg / cm ²⁾ was allowed to reduced pressure (for example, 3 kg / cm ^2), is intended for supply to the pump 3. The air solenoid valve 13 is an on-off valve for shutting off compressed air supply to the pump 3. .

In each weighing machine 16, the pump 3 is started and stopped by turning on / off the switch 25 provided on the hook portion of the weighing machine 16 (when the switch 25 is hooked [when not refueling]). The solenoid valve 13 for air is controlled to open and close by turning it off and off [during refueling] and turning it on. The amount of oil fed is measured by the flow meter 5, and the amount is displayed on the display device 19 to the automobile or the like. Refuel. The oil supply nozzle 4 is provided with a nozzle lever (not shown) and a valve body (not shown) that is normally closed and is opened by gripping the nozzle lever.

Next, the operation of the oil supply system having such a configuration will be described. Compressor 6 and volume tank 11
Keeps a constant pressure at all times, and automatically operates when the pressure drops to a specified pressure, and stops automatically when the pressure rises to a fixed pressure. When the vehicle or the like stops in front of the weighing machine 16 for refueling, if the refueling nozzle 4 is removed from the hook portion, the switch 25 is turned on and a signal to that effect is sent to the display 19 and the control device 24. It

The display 19 receives this signal and resets the previous display. The control device 24 uses the switch 25.
When the ON signal is received, the solenoid valve 17 for the weighing machine is opened and the solenoid valve 13 for the air is opened, and the preparation for refueling is completed. Next, when the refueling nozzle 4 is inserted into the refueling port of the automobile and the nozzle lever is grasped to open the valve, the refueling nozzle 4
Since the nozzle opening of is opened to the atmosphere, the pump 3 is activated and fuel supply to the automobile is started. At this time, since the oil passes through the flow meter 5, the flow rate is measured, the measured amount signal is received by the display device 19, and the display is counted up.

At the same time as the filling tank of the automobile is filled or the designated amount is reached, the nozzle opening of the filling nozzle 4 is closed and the oil passage is closed, and at the same time the driving of the pump 3 is stopped. When refueling is completed and the refueling nozzle 4 is returned to the hook portion, the switch 25 is turned off, and the air solenoid valve 13 and the weighing machine solenoid valve 17 are closed. When refueling a plurality of automobiles, the operation is the same as the above, but the solenoid valve 13 is opened even if the switch 25 is in one place, and when the switches 25 of all the weighing machines 16 are off. Close the valve.

Next, to further clarify the above description,
The operation flow of the pump will be described based on the flowchart of FIG. In this flowchart, step 1
(In the figure, it is abbreviated as S1. The same applies to the following). In step 2, the display 19 is reset. In step 3, the solenoid valve 13 for air is turned on and opened, and in step 4, the solenoid valve 17 for weighing machine is turned on and opened.

In the next step 5, the nozzle lever of the oil supply nozzle 4 is grasped to open the valve. In step 6,
The pump 3 is operated to start refueling. In step 7,
It is determined whether or not the valve of the fueling nozzle 4 is closed. If it is closed, the process proceeds to step 8, if it is not closed, the process returns to step 7, and this determination is repeated.

In step 8, the operation of the pump 3 is stopped, and in step 9, it is judged whether or not the refueling nozzle 4 is hooked by the switch 25 being turned off. Go to 10,
The air solenoid valve 13 is turned off (however, when another weighing machine 16 is operating, that is, the switch 25 is turned on).
If it is, keep it ON), Step 1
Proceed to 1 and turn off the solenoid valve 17 for the weighing machine.

If it is determined in step 9 that the refueling nozzle 4 is not hooked, the process proceeds to step 12, where it is determined whether the valve of the refueling nozzle 4 is opened, and if it is determined that the valve is opened, the step 6 is performed. Returning to step 3, when it is determined that the pump 3 is continuously operated to continue refueling and the valve of the refueling nozzle 4 is not opened, the process proceeds to step 9, and it is determined whether or not the refueling nozzle 4 is hooked again. .

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the pump 3 is built in the underground tank 1, and other structures are the same as those of the first embodiment of FIG. It is similar to the form. The exhaust pipe 14, the compressed air supply pipe 8 and the oil feed pipe 2 connected to the pump 3 are inserted into the underground tank 1 through the hole 7 through the tank port 1A.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, the pump 3 is incorporated in each weighing machine 16, and other structures are shown in FIG.
The first embodiment and the second embodiment of FIG. 2 are different as follows. That is, branch pipes 8A and 8B branched from the downstream end of the compressed air supply pipe 8 are connected to the pair of pumps 3 installed on the bottom side of the weighing machine 16, respectively.
Electromagnetic valves 13 for air are provided in A and 8B, respectively.
A suction pipe 9 and an oil feed pipe 2 are connected to each pump 3, and the suction pipe 9 is inserted into the underground tank 1 so as to hang down from the tank port 1A. The branch pipes 2A and 2B on the downstream side of the pump 3 in the oil feed pipe 2 are respectively provided with strainers
8, a solenoid valve 17 for a weighing machine, and a flow meter 5 are sequentially provided, and a fueling nozzle 4 is connected to the downstream ends of the branch pipes 2A and 2B.

Further, the accumulator 10 is built in the weighing machine 16, and the accumulator 10 is connected to the branch pipes 2A and 2B between the pump 3 and the strainer 18. According to the oil supply device of the embodiment shown in FIGS. 1 to 3, the following advantages can be obtained. (1) By using the diaphragm-type air-driven variable displacement pump 3 instead of the electric pump unit,
Since the direct power source for sending the oil to the weighing machine 16 is air, and there is no ignition source called an electric motor in the dangerous area,
There is no need to worry about fire and the need for explosion-proof treatment. (2) For the same reason as above, various safety protection measures are unnecessary. (3) Refueling is possible even during a power failure. (4) Diaphragm air driven variable displacement pump 3
Changes its reciprocation degree according to the magnitude of the pressure loss of the oil feed pipe 2, and operates only when the discharge port (fuel filler nozzle) of the oil feed pipe 2 is opened to the atmosphere. Therefore, the relief mechanism (passage) is It becomes unnecessary, there is no waste of power consumption, and there is no need to adjust the relief pressure of the relief mechanism. (5) Diaphragm air-driven variable displacement pump 3
Since the delivery amount changes depending on the ejection amount, heat generation is small, and the air consumption amount can be suppressed to the necessary minimum. (6) The accumulator 10 is attached to the oil feed pipe 2 on the downstream side of the pump 3.
Since this is connected, it is possible to suppress the pulsation generated in the oil feed flow of the diaphragm-type air-driven variable displacement pump 3 by the air pressure, and it is possible to suppress the fluctuation of the oil supply amount. (7) In particular, according to the first and second embodiments of the drawings, the pump 3 is arranged outside the underground tank 1 or is built in the underground tank 1 and is not provided in the weighing machine 16. Therefore, the structure of the weighing machine 16 can be simplified and the size thereof can be reduced.

In this embodiment, the diaphragm air-driven variable displacement pump 3 is used as the oil feeding means, but a pump having a reciprocating element such as a piston may be used as the oil pressure feeding means.

[0033]

As described above, according to the first aspect of the invention, instead of the electric pump unit, the compressed gas directly fed from the gas compression means causes the pressure feeding means such as the diaphragm to directly reciprocate. By using the oil feeding means configured to feed oil, the direct power source for feeding oil to the weighing machine becomes air, and there is no ignition source called an electric motor in the dangerous area There is no need to worry about such problems, explosion proof processing is not required, various safety protection measures are not required, power consumption is not wasted, and relief pressure adjustment of the relief mechanism is not required.

According to the second aspect of the invention, by applying the diaphragm-type air-driven variable displacement pump, it is possible to effectively exhibit the advantages of less heat generation and the minimum air consumption. . According to the invention of claim 3, since the accumulator is connected to the oil feed pipe on the downstream side of the pump, the pulsation generated in the oil feed flow of the oil feed means can be suppressed by the air pressure, and the fluctuation of the oil supply amount. Can be suppressed.

According to the inventions according to claims 4 and 5, the pump is arranged outside the underground tank or built in the underground tank so as not to be installed in the weighing machine. Therefore, the structure of the weighing machine is simplified. It can be miniaturized as well as miniaturized. According to the invention of claim 6, the pump can be easily installed.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing a second embodiment of the present invention.

FIG. 3 is an overall configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a flowchart illustrating the operation of the above embodiment.

FIG. 5 is a sectional view of a diaphragm-type air-driven variable displacement pump according to the above embodiment.

[Explanation of symbols]

 1 Underground Tank 2 Oil Pipe 3 Pump 4 Oil Nozzle 5 Flow Meter 8 Compressed Air Supply Pipe 10 Accumulator 13 Air Solenoid Valve 16 Metering Machine 17 Metering Solenoid Valve 24 Control Device

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Yoshiaki Kotake 1-3-12 Nishishimbashi, Minato-ku, Tokyo Inside Nippon Oil & Oil Co., Ltd. (72) Norito Maeno 1-3 Nishishinbashi, Minato-ku, Tokyo No. 12 In Nippon Oil & Oil Co., Ltd. (72) Inventor Shigemi Komukai 1-3-6 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokiko Co., Ltd.

Claims (6)

[Claims] 1. An underground tank which is buried underground and stores oil therein, an oil feed passage connected to the underground tank, and an oil feed passage interposed between the underground feed tank and the underground tank. Oil supply means for supplying the oil, an oil supply nozzle connected to the downstream end of the oil supply path for discharging the oil to the supply target part, and a flow rate of the oil which is interposed in the oil supply path and flows. And a gas compression means, while the oil feeding means is provided with an oil pressure feeding means,
An oil supply device characterized in that the compressed gas directly sent from the gas compressing means is configured to directly reciprocate the pressure sending means to send oil. 2. The oil feeding means is a diaphragm type air driven variable displacement pump.
A refueling device as described. 3. The oil supply device according to claim 1, wherein an accumulator is connected to an oil supply passage on the downstream side of the oil supply means. 4. The refueling device according to claim 1, wherein the refueling means is disposed underground outside the underground tank. 5. The refueling device according to claim 1, wherein the refueling means is built in an underground tank. 6. The oil feeding means is built in a weighing machine which is equipped with at least a flow meter and an indicator to measure the oil and feed the oil from a fueling nozzle. The refueling device according to one.