JPS607360Y2 - Refueling device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a refueling device for gasoline, etc.

Oil liquids such as gasoline, kerosene, and heavy oil are stored in underground tanks, and from the pump unit connected to the underground tank via underground piping, above-ground piping is raised further upwards to lead to a high location at the gas station. In the case of a suspended type refueling system in which a refueling hose is connected to piping, zinc-coated steel pipes are generally used to prevent rust or corrosion of the steel pipes used as piping materials.

However, as is well known, there is a potential difference between zinc-coated steel pipes and exposed parts of iron such as their connecting welds, so moisture acts as a medium, causing corrosion due to so-called battery action, and zinc elution from the steel pipes. In particular, when the piping becomes long like the oil supply system mentioned above, the amount of zinc eluted and the amount of zinc that falls off increases proportionally, causing clogging of the filters and nozzles in the oil supply system, and Inconveniences such as shortages are occurring.

Regarding moisture, which is a medium for corrosion, for example, gasoline has a solubility of 50 to 200 ppm at room temperature, so the corrosive action is slow, but in the case of gasoline in an underground tank, moisture enters and exits due to temperature differences. This leaves a lot of moisture at the bottom of the tank, which increases the influence of this moisture on corrosion.

In other words, in the case of underground tanks, the presence of moisture that affects corrosion cannot be ignored; rather, countermeasures must be taken on the assumption that this moisture exists.

In view of the above, the present invention aims to provide a lubricating device that effectively utilizes battery action, prevents corrosion caused by rust, and is less likely to cause clogging of filters, nozzles, etc. At least a portion of the underground piping is made of zinc-coated steel pipes, and the above-ground piping is made of aluminum-coated steel pipes to form the refueling system.

Specific examples will be explained below based on the drawings.

A tank 1 for storing gasoline or other oil liquid is installed inside a wall 2 provided underground.

An underground pipe 4 for suction is connected between this tank 1 and a pump unit 3 installed above ground.

5 is a check valve that prevents the oil from flowing back when the pump unit 3 is stopped.

In this example, the underground piping 4 is made of zinc-coated steel pipe over its entire length, but only a portion thereof, for example, only the horizontal portion 4a of this underground piping, may be made of zinc-coated steel pipe.

In this case, the rest may be aluminum-coated piping or uncoated steel pipes, similar to above-ground piping described below.

Although a steel plate is used for the inner surface of the tank 1, this steel plate is usually not surface-treated.

Therefore, between the zinc-coated steel pipe and the inner surface of the tank, the zinc side acts as an anode and the iron side acts as a cathode, so the zinc is corroded, but the iron side, that is, the tank side, is not easily corroded.

Furthermore, due to the increase in pH due to the dissolution of zinc, the water inside the tank becomes alkaline, and the alkali coating also has an anticorrosion effect.

In this way, even if the inner surface of the tank itself is not subjected to any particular surface treatment, the tank can be sufficiently protected against corrosion simply by connecting the zinc-coated steel pipe to the tank.

The tank 1 includes a measuring port 6 for measuring the amount of oil in the tank, an inflow lower for allowing the oil to flow into the tank 1 from an oil transport vehicle such as a tank truck, and further from the inflow lower. A vent pipe 8 is provided to allow air to enter and exit when oil is flowing in or when the pump unit 3 is driven to absorb oil, and the metering port 6 and the inflow lower are normally covered by a manhole cover 9. There is.

The pump unit 3 includes a pump 10, a motor 11 that drives the pump 10, a flow meter 13 connected to the outlet side of the pump 10 via a strainer 12, and a transmission mechanism that transmits the flow rate obtained by the flow meter 13. It consists of 14.

The transmitting mechanism 14 employs a cam transmitting method or a reed switch method as a contact method, and a high frequency transmitting method or a generator transmitting method as a non-contact method. , 16 to the indicator 17 and small counter 18,
Displays flow rate.

The pump unit 3 is installed in a gas station connection room 19.

A ground piping 20 is connected to the outlet side of the flow meter 13.

This ground piping 20 rises from the flow meter 13 and connects to the continuous chamber 1.
The hose 23 reaches a high place such as the ceiling 21 of No. 9 and is connected to a hose 23 hanging from the ceiling 21 via a hose lifting device 22.

24 is a nozzle attached to the lower end of the hose 23.

This ground piping 20 is made of aluminum-coated steel pipe.

Conventionally, this above-ground piping 20 also used zinc-coated steel pipes, which increased the overall length of the zinc-coated steel pipes, which increased the amount of zinc eluted and fallen off, which also caused clogging in the nozzles 24. However, in the present invention, since an aluminum-coated steel pipe is used as the above-ground piping 20, the nozzle 24 will not be clogged due to such a cause.

According to the present invention configured as described above, even if the water 26 collects at the bottom of the oil liquid 25 stored in the tank 1 and this water acts as a medium to perform the battery action, the zinc installed in the underground pipe 4 is eluted, so no corrosion occurs on the inner surface of the tank 1 or on the welded joints of the piping.

Moreover, since only the underground piping is made of zinc-coated steel pipes, the total length is small, and therefore the amount of zinc falling off is small, so there is little chance of the strainer becoming clogged.

In addition, since all piping uses coated steel pipes, rust does not occur and corrosion due to rust can be prevented and durability can be improved.

Since the strainer is less likely to be clogged and the nozzle is almost never clogged, metering can be performed well and high-quality oil can be supplied.

Even if the zinc-coated steel pipe corrodes due to use, this portion is only slightly corroded and can be easily replaced.

[Brief explanation of the drawing]

The figure is a sectional view of the oil supply device of the present invention. 1... Tank, 3... Pump unit, 4... Underground piping, 20... Above ground piping.

Claims (1)

[Scope of utility model registration request] In a refueling system, an underground tank containing oil liquid is connected to a pump unit via underground piping, an above-ground piping is raised from the pump unit to a high place at a refueling station, and a refueling hose is connected to the above-ground piping. A refueling system characterized in that at least a portion of the above-ground piping is made of zinc-coated steel pipes, and above-ground piping is made of aluminum-coated steel pipes.