JPS6039773Y2 - Liquid level reduction amount integration device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that integrates the amount of drop in liquid level as liquid that has appropriately flowed into a tank and is stored flows out.

When it is necessary to know the amount of outflow of liquid stored in a tank, the outflow flow rate is usually measured.

However, in cases where it is difficult to measure the outflow flow rate, it is extremely difficult to measure the outflow amount.

Therefore, since the liquid level in the tank decreases as the liquid flows out of the tank, the inventor of the present invention decided to integrate the amount of the drop and measure the amount of outflow from the cumulative amount of drop and the cross-sectional area of the tank. Thought.

The object of the present invention is to provide a liquid level reduction amount integrating device that can be effectively used for measuring such outflow amount.

An embodiment of the present invention will be described below based on the drawings.
1 is a tank, and a liquid 2 that has appropriately flowed into the tank 1 is stored.

Reference numeral 3 denotes a closed container disposed at the bottom of the tank 2, and an opening 4 is provided in the bottom surface to communicate the inside of the container with the inside of the tank.

5 has one end connected to the pressure gas source 6 and the other end connected to the closed container 3.
An air supply pipe that supplies pressurized gas into a closed container 3 connected to an outlet 5 that projects into the closed container at the other end of the air supply pipe 5.
A float valve 7 is provided at a.

A flow meter 8 is installed in the middle of the air supply pipe 5 to integrate the amount of gas passing through the air supply pipe 5.

Note that there is a rising portion 5b in the middle of the air supply pipe 5 so that at least a part of the pipe is located at a position higher than the highest liquid level in the tank 1.
is provided to prevent the liquid in the tank 1 from reaching the flow meter 8 even if there is a failure in the float valve 7 or the like.

Next, to explain the operation, in the state shown in FIGS. 1 and 2, the liquid level 2a of the liquid 2 is at an appropriate level, and the closed container 3 is filled with gas at a pressure equal to the water head pressure. Float valve 7 is closed.

When liquid 2 is allowed to flow out from tank 1 in this state, the liquid level 2
a falls, and as a result, the head pressure applied to the closed container 3 through the opening 4 decreases, so that the gas inside the closed container 3 flows out into the tank 1 through the opening 4, as shown in FIG. 3a.

The amount of gas flowing out is proportional to the amount of decrease in the liquid level 2a.

After that, when the liquid 2 is allowed to flow into the tank 1, the liquid level 2a rises, and as a result, the water head pressure applied to the closed container 3 through the opening 4 increases, so that the gas inside the closed container 3 is compressed.
The liquid 2 enters the closed container 3 through the opening 4.

Then, as shown in Figure 3, the float 7a of the float valve 7 is lifted by the inflowing liquid, so the float valve 7 opens, and pressurized gas is supplied from the air supply pipe 5 into the closed container 3, and the pressure equal to the water head pressure is increased. When the airtight container 3 is filled with the pressure gas, the float valve 7 closes.

(The state shown in FIG. 2) The amount of gas supplied into the closed container 3 is integrated by the flow meter 8.

Only when the liquid level 2a decreases due to the above operation, the airtight container 3
Gas flows out from inside, and the amount of gas is supplied from the air supply pipe 5 into the sealed container 3 when the liquid level 2a rises, so the amount of gas corresponding to the amount of decrease in the liquid level 2a is finally measured by the flowmeter 8. will be accumulated.

Furthermore, it is clear that no matter how many times the liquid level 2a is lowered or raised, the amount of gas corresponding to the total amount of lowering is integrated by the flow meter 8, and therefore the cross-sectional area of the tank 1 is equal to the liquid level. If it is constant regardless, the integrated amount of the flow meter 8 is proportional to the total amount of liquid flowing out from the tank 1.

Note that in order to immediately know the integrated value of the liquid level drop from the flowmeter, it is necessary to make the final liquid level match the liquid level at the start of measurement (for example, the highest liquid level in tank 1); If the liquid level can be measured visually or by other means, the amount of liquid flowing out between the flowmeter reading and the final liquid level reading can be calculated.

According to the present invention, as is clear from the above description, the integrated value of the liquid level drop can be easily determined by converting the flow meter reading.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a schematic diagram of the overall device, Fig. 2 is a vertical cross-sectional view of a closed container, and Fig. 3a,
b is a diagram showing each operating state of the closed container. 1...tank, 2...liquid, 3...
・Airtight container, 5... Air supply pipe, 6... Pressure gas source, 7... Float valve, 8...
Flowmeter.

Claims (1)

[Scope of utility model registration request] An airtight container having an opening on the lower surface is disposed at the bottom of the tank, and an air supply pipe for supplying pressurized gas is connected to the airtight container, a float valve is provided at the outlet of the air supply pipe in the airtight container, and the air is passed through the air supply pipe. A liquid level drop amount integrating device characterized by being provided with a flow meter that integrates the amount of gas.