JPH0392721A - Fuel measuring and supplying method, and fuel measuring apparatus - Google Patents

Abstract

PURPOSE:To omit oil feeding completely in a low flow-rate region where a measuring error is large by providing a pipe with which a flowmeter having a back pressure regulating valve at an inlet port of a private tank and an opening and closing valve are connected in series when a main tank arranged at a high place is connected to a plurality of private tanks with the pipe and a fuel feeding apparatus is provided. CONSTITUTION:A main tank 1 for storing fuel oil is arranged at a sufficiently high place. Private fuel tanks 2 which are provided at a plurality of users are arranged at the low land. The tanks are connected with a pipe 3. At the inlet port of each tank 2, a flowmeter 4 which is positioned at the upstream side and an opening and closing valve 5 which is positioned at the downstream side are provided. When the valve 5 is closed in this constitution, a back pressure regulating valve 8 is in the closed state with a spring 11 since the pressure at an inflow port 6 and an outflow port 7 of the flowmeter 4 becomes the same. When the valve 5 is gradually opened for oil feeding, the pressure at the outflow port 7 is decreased. Therefore, the pressure difference before and after the flowmeter 4 becomes gradually larger. When the valve travel of the valve 5 reaches the specified position, the valve 10 is opened against the force of the spring 11, and the oil feeding is started through an outlet hole 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method a3 for accurately metering and supplying fuel oil or the like from a main tank to a plurality of private tanks, and a metering device therefor.

[Conventional technology] In areas where it is difficult to directly refuel customers' private tanks due to heavy snowfall in the winter, a main tank is installed at a high location, and fuel oil is supplied to each customer's private tank via piping. Methods are being used to replenish. In this case, in order to control the amount of fuel oil supplied, a flow meter is generally installed at the entrance of each private tank.

[Problems to be solved by the present invention]

However, with this method, there is a limit to the performance (measurable flow rate range) of the flow rate that can be installed, and in particular, when used in a low flow area, measurement errors usually become large. When it is possible to measure in a low flow rate range using a type flow meter, small foreign objects or scales in the liquid often cause important parts to stop rotating, making measurement impossible, which has become a major problem. The present invention was invented with the aim of solving this problem.

[Means to solve the problem]

In order to achieve this purpose, the first invention is to arrange a main tank storing refueling oil at a high place, to connect the main tank to a plurality of private tanks with piping so as to supply fuel directly, and to provide an inlet for each private tank. (A flow meter and an on-off valve are each connected in series, and when the on-off valve is opened to a predetermined opening degree, the back pressure valve of the flow meter opens and the flow rate is greater than the lower limit flow rate measured by the flow meter.) This is a metered fuel supply method in which the fuel flows at a flow rate and refills a private tank.

A second invention is a fuel supply system in which a main tank disposed at a high place and a plurality of private tanks are connected by piping, and a flow meter and an on-off valve provided with a back pressure valve at the inlet of the private tanks. This is a fuel metering device in which both are connected in series.

(Operation) When the on-off valve 5 is closed, the pressure on the upstream side (inflow port 6) and downstream side (outflow port 7) of the flowmeter 4 is the same, so the back pressure valve 8 is closed by the force of the spring 11. Start refueling [At this time, gradually open the on-off valve 5 (when it opens, the pressure at the outlet 7 of the flow meter 4 will drop, so the differential pressure before and after the maximum flow rate 4 will gradually increase. rjilIE7J valve 5 When the opening degree reaches a predetermined position, the valve 10 opens against the force of the spring 11, and oil flows out from the outflow hole 9 and begins to be supplied to the private tank 2.

At this time, since the flow rate is higher than the lower limit flow rate for measurement of the flow rate 514, the flow rate can be accurately measured by the flowmeter 4. Furthermore, by opening the close/close valve 5, oil can be supplied at a desired flow rate. This effect can be adjusted by springs in substantially the same way in each private tank line.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
In the figure, 1 is a main tank that stores fuel oil, and is installed at a high enough location for refueling. On the other hand, 2 is a private tank, which is a small fuel tank installed at each of a plurality of consumers.

The main tank 1 and the private tank 2 are connected by piping 3, and the inlet of the white house tank 2 is equipped with a flow meter 4 on the upstream side and an on-off valve 5 arranged in series on the downstream side. It is being

Moreover, the flow meter 4 has an outlet 7 as shown in FIG.
A back pressure valve 8 is incorporated in the. As shown in FIG. 3, this back pressure valve 8 includes a valve 10 which is held to open and close the outflow hole 9, and
A spring 11 is attached in a direction that always closes the valve 10. When the back pressure valve 8 is opened, the flow rate is larger than the lower limit flow rate measured by the flow meter.

Next, the operation of the present invention will be explained. When the on-off valve 5 is closed, the pressures at the inlet 6 and outlet 7 of the flow meter 4 are the same, so the back pressure valve 8 is kept closed by the spring 11. When the on-off valve 5 is gradually opened at the start of refueling, the pressure at the outlet 7 of the flow meter 4 decreases, so that the differential pressure across the flow meter 4 gradually increases. When the opening degree of the on-off valve 5 reaches a predetermined position, the valve 10 opens against the force of the spring 11, and oil flows out from the outflow hole 9 and begins to be supplied to the private tank 2.

At this time, the water passing through the shore is accurately measured by the flow meter 4 because it flows at a flow rate higher than the lower measurement limit of the flow meter 4. Furthermore, by opening the on-off valve 5, oil can be supplied at a desired flow rate.This action can be adjusted in the same way using springs in the lines of other private tanks. [Effects of the Invention] As is clear from the embodiments described above, the present invention has a main tank storing fuel oil located at a high place, piping so that fuel oil is directly supplied from the main tank to a plurality of private tanks, A back pressure valve is installed at the inlet of the private tank.A flow meter and an on-off valve are each connected in series, and the on-off valves are opened to a predetermined opening degree. This is a metered fuel supply method that supplies fuel to private tanks by flowing at a flow rate greater than the minimum flow rate for measurement, and the device consists of piping that connects a main tank located at a high place and multiple private tanks. This is a fuel meter installation field in which a flow meter with a back pressure valve provided at the inlet of the private tank and an on-off valve are connected in series in a fuel diagonal refueling system.

According to this invention, by opening the on-off valve, instead of operating the on-off valve, the flow automatically flows at a flow rate higher than the lower limit flow rate measured by the flowmeter, so there is no need to refuel in the low flow rate range where measurement errors are large. It is now possible to measure and refuel accurately.

Therefore, the problem of fuel supply amount that had occurred between suppliers and consumers in fuel oil transaction management has been resolved. Furthermore, this metering and supplying method can be used without the need for a positive displacement flowmeter or other type of flowmeter that can measure with high accuracy down to a low flow rate range, resulting in significant effects such as a reduction in the cost of the device.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing one embodiment of the present invention, Fig. 2 is a partially sectional front view of the flowmeter used in Fig. 1, and Figs. It is an enlarged sectional view showing operation of a pressure valve. 1: Main tank 2: Private tank 3: Piping
4: Flow meter 5: Open/close valve 6: Inlet 7: Outlet 8: Back pressure valve 9: Outlet hole 10: Valve 11: Spring

Claims (1)

[Claims] 1) A flow rate system in which a main tank storing fuel oil is located at a high location, piping is provided to directly supply fuel from the main tank to a plurality of private tanks, and a back pressure valve is provided at the inlet of the private tanks. A meter and an on-off valve are each connected in series, and when the on-off valve is opened to a predetermined opening degree, the back pressure valve of the flow meter opens, and the flow flows at a flow rate greater than the lower limit flow rate measured by the flow meter, supplying oil to a private tank. A method for metering and supplying fuel. 2) In a fuel supply system in which a main tank installed at a high place and a plurality of private tanks are connected by piping, a flow meter with a back pressure valve and an on-off valve are connected in series at the inlet of the private tanks. A fuel metering device characterized by being connected to each other.