JPH0520630B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention mainly applies to the case where a liquid is sucked into a large tank by a pump from a tank truck, for example, and stored in a pipe line for transferring the liquid. The present invention relates to an automatic opening/closing valve device that is provided and automatically operates when suction is started from a small tank and when the small tank becomes empty, and has an opening/closing function and a gas-liquid separation function.

<Prior art> Conventionally, when transferring oil from a tank lorry to a large storage tank, etc., as shown in Fig. 2, the oil is transferred from the tank 1 of the tank lorry to a connecting pipe 2, a manual opening/closing valve 3, a collecting pipe 4, and a suction pipe. The liquid is transferred to a large tank 7 via a liquid sending pump 6 equipped with a pressure gauge 5 on the side. In this device, oil can be simultaneously transferred from a plurality of tanks 1 to one large tank 7 by the suction action of the pump 6. The operating procedure is to connect the connecting pipe 2 to the tank 1, open the on-off valve 3, and operate the pump 6. At this time, if air is mixed in the pipe line, operate the air release valve 6a of the pump 6. to bleed air. When one of the tanks 1 becomes empty, air is sucked in, the vacuum on the suction side of the pump 6 is broken, and the pressure rises to approach atmospheric pressure, so this is detected by the pressure gauge 5.
Stop the pump 6 and close the on-off valve 3. In that case, if oil is being sucked from multiple tanks 1 at the same time, it will not be possible to detect which tank 1 is empty, but in reality, the amount of oil stored in tank 1 and the time required for transfer will be taken into account. It seems that the worker is making the decision. Next, perform the air bleeding operation to resume suction.

<Problems to be Solved by the Invention> In the conventional oil transfer device, there is a problem that when there are multiple tanks 1, it is not possible to know which tank is empty, and the on-off valve 3 is a manual on-off valve. For this reason, there is a problem that it takes time and effort, and furthermore, it is necessary to perform an air bleeding operation every time one of the tanks 1 becomes empty, which is also a problem that takes time and effort. The air bleeding operation stops the pump 6 each time.
The oil transfer becomes intermittent, and the transfer efficiency decreases accordingly.

Instead of the manual on-off valve 3, it is possible to use an automatic valve that closes electrically based on detecting a pressure drop with the pressure gauge 5, but it is necessary to adopt an explosion-proof structure for oil transfer. Therefore, there is a problem that the device becomes expensive, and in a configuration that detects a drop in pressure on the suction side of the pump 6, air flows into the collecting pipe 4, so an air bleeding operation is necessary, and the pump The problem of intermittent operation is not resolved.

This invention is capable of not only detecting when a small tank is empty in the suction pipe system of a liquid pump as described above, but also automatically closing the liquid passage to the air pump. Mechanical automatic on-off valve that prevents air from being inhaled and automatically vents air to the atmosphere to open the liquid passage when connecting another small tank containing oil and restarting oil transfer. The challenge is to provide equipment.

<Means for Solving the Problems> The automatic opening/closing valve device for a liquid suction system of the present invention has a valve chamber, and has an inlet communicating with the valve chamber and connected to a tank from which liquid is taken out. , a casing having an outlet connected to the suction side of the liquid transfer pump; an outflow valve hole provided between the lower part of the valve chamber and the outlet; a movable on-off valve comprising a float valve body provided to open the outflow valve hole by rising when the liquid level in the valve chamber rises, and the outflow valve hole of the automatic on-off valve to close the outflow valve hole; The valve chamber also has an exhaust pipe provided with one end opening in the valve chamber at an upper position, and a second valve chamber with the other end of the exhaust pipe connected to the lower part at a higher position than the automatic on-off valve. , a second valve chamber at least partially made of a transparent material so as to be able to observe the presence or absence of liquid inside the second valve chamber;
a casing, an exhaust valve hole provided to communicate with the upper part of the second valve chamber and the outside; The exhaust valve includes a second float valve body that opens the valve hole and is provided to rise when the liquid level in the second valve chamber rises to close the exhaust valve hole.

<Function> This automatic opening/closing valve device is used with an exhaust valve installed at the inlet below the bottom of the tank to which it is connected.
When the pump is operating with the pipe line between the outlet and the pump filled with liquid, negative pressure is applied to the outlet side due to the suction action of the pump. When there is no liquid in the valve chamber, the float valve element is lowered and the outflow valve hole is closed, so the air in the valve chamber does not flow to the outlet side. When a tank containing liquid is connected to the inlet side, the liquid flows into the valve chamber from the inlet.
At this time, the air in the valve chamber and the pipe connected to the inlet is discharged from the open exhaust valve hole via the exhaust pipe, and when the liquid level in the valve chamber rises, the lower outflow valve hole is filled with liquid. The float valve body floats up and the outflow hole opens, allowing only the liquid to flow out to the outlet side. When the air in the valve chamber is exhausted and the opening in the valve chamber of the exhaust pipe line becomes submerged below the liquid level, liquid flows into the second valve chamber of the exhaust valve through the exhaust pipe, and the second valve chamber opens in the exhaust pipe.
The float valve element floats up and closes the exhaust valve hole. In this state, liquid is transferred.

When the tank from which liquid is taken is empty, air finally flows into the valve chamber of the automatic on-off valve. Until now, liquid pressure equivalent to the tank liquid level was acting at the inlet, but now it will drop to atmospheric pressure, and as the inlet side pressure decreases, it will be pushed up into the exhaust valve. The liquid returns to the valve chamber, and the second float valve element descends to open the exhaust valve hole, allowing air to flow in through the exhaust valve hole as well. As a result, the liquid level in the valve chamber is lowered, so that the float valve element also lowers and closes the outflow valve hole. Therefore, the air that has flowed into the valve chamber does not flow out to the outlet side. When the connection on the inlet side is changed to a tank containing liquid, liquid transfer is resumed in the same manner as described above.

<Example> An example is shown in FIG. In the figure, 10 is an automatic opening/closing valve, and 11 is an exhaust valve.

The automatic opening/closing valve 10 has a valve chamber 1 in a casing 12.
3 and has an inlet 14 communicating with the upper part of the valve chamber 13, and an outlet 15 is provided on the opposite side of the inlet 14, and this outlet 15 is connected to a passage 16 and an outflow valve hole 17.
It communicates with the lower part of the valve chamber 13 via. The casing 12 is formed by a main body 18 and a lid 19, and has an inlet 14 and an outlet 15 to which a liquid transfer pipe can be connected. The outflow valve hole 17 is provided with a valve seat 20 on the side of the valve chamber 13, and is opened and closed by a float valve body 21 housed in the valve chamber 13. The float valve body 21 is a spherical body that is lighter than the liquid to be transferred, and is supported by a valve body pedestal 22 whose liquid level is lowered so that the center height of the float valve body 21 and the center of the outflow valve hole 17 coincide with each other, and the liquid level is lowered. 17 is properly closed, and when the liquid level rises, it floats up and opens the outflow valve hole 17.

The exhaust valve 11 has a second valve chamber 31 inside the second casing 30, and an exhaust pipe line 32 is connected to the second valve chamber 31.
, an exhaust valve hole 33 is provided, and a second float valve body 34 is accommodated in the second valve chamber 31 .
The second casing 30 has lids 36 and 37 screwed to the upper and lower ends of a main body 35 made of cylindrical transparent glass, so that the presence or absence of liquid inside can be observed. One end of the exhaust pipe line 32 is connected to the automatic opening/closing valve 10.
It is provided to open at a higher position than the outflow valve hole 17 of the valve chamber 13 of the exhaust valve 11, and the other end is connected to the lower part of the second valve chamber 31 of the exhaust valve 11 at a position higher than the automatic on-off valve 10. . In the figure, 38 is an upper end opening of the exhaust pipe, and 39 is a lower end opening of the exhaust pipe. A valve seat 40 is provided in the exhaust valve hole 33 on the second valve chamber 31 side. The second float valve body 34 has a spherical shape that is lighter than the liquid to be transferred, and when the liquid flows into the second valve chamber 31 through the exhaust pipe line 32 and the liquid level rises, it floats to the exhaust valve hole 33. is closed, and when the liquid level falls, the exhaust valve hole 33 is opened.

The automatic opening/closing valve device configured in this way has a second
In the liquid transfer device shown in the figure, manual on-off valve 3
Use it instead. That is, the entire system is installed such that the inlet 14 of the automatic on-off valve 10 is connected to the tank 1 side, the outlet 15 is connected to the pump 6 side, and the exhaust valve hole 33 is located below the bottom of the tank 1.

When one of the plurality of tanks 1 becomes empty from a state in which each tank 1 is filled with oil and the pump 6 is operating, air flows into the automatic on-off valve 10 connected to that tank 1 from the inlet 14 and the valve chamber The liquid level in 13 falls. As a result, the float valve body 21, which had been floating until then, descends, and the outflow valve hole 17, which had been open until then, is closed. During this time, the valve chamber 3 of the exhaust valve 11
The liquid that had been pushed up into the valve chamber 1 through the exhaust pipe 32 also returns to the valve chamber 13 due to the pressure drop within the valve chamber 13 and flows out from the outflow valve hole 17. Outflow valve hole 17
is closed by the float valve body 21 before the liquid level in the valve chamber 13 falls to the position of the outflow valve hole 17, so the air that has flowed into the valve chamber 13 will not flow out from the outflow valve hole 17. Therefore, no air enters the collecting pipe 4. This causes the pump 6 to continue transferring oil from the other tank 1 to the tank 7.
Whether the tank 1 is empty can be determined by checking whether or not oil is present in the exhaust valve 11, and therefore can be determined visually.

When the connecting pipe 2 is disconnected from the empty tank 1 and another tank 1 filled with oil is connected, the air in the connecting pipe 2 and the valve chamber 13 of the automatic on-off valve 10 is discharged through the exhaust pipe line 32, the Oil flows into the valve chamber 13 while being discharged through the two valve chambers 31 and the open exhaust valve hole 33. The liquid level in the valve chamber 13 rises as air is discharged, but the float valve body 21 floats up and the outflow valve hole 1
7 is opened, and only oil flows out into the collecting pipe 4. The liquid level in the valve chamber 13 is at the lower end opening 39 of the exhaust pipe.
When the internal pressure inside the valve chamber 13 increases,
Oil flows into the second valve chamber 31 of the exhaust valve 11 through the exhaust pipe line 32, the liquid level rises, and the second float valve 3
4 closes the exhaust hole 33 and prevents oil from flowing out.

In the embodiment described above, an example was shown in which oil is transferred from a plurality of tanks 1 to a tank 7 using one pump 6, but it can also be used when there is only one tank 1.

In the above embodiment, the main body 35 of the exhaust valve 11 is made of transparent glass, but it may be made of any material that allows the presence or absence of liquid inside to be visually observed. It may be possible to make it observable or to know the height position of the second float valve body.

<Effects of the Invention> When a pump is used to transfer oil, etc. from a tank to another tank, the automatic opening/closing valve device of the present invention can be used in the suction system of the pump to remove oil, etc. When a tank is empty, you can tell by the lack of liquid in the exhaust valve, so when transferring oil from multiple tanks to a larger tank with one pump, The task is made easier in that it is possible to know which tank is empty. In addition, when the tank is empty, the passage is automatically and purely mechanically closed, and when another tank filled with oil, etc. is replaced, it is automatically and purely mechanically opened. It has the ability to separate gas and liquid by separating and discharging the air in the valve chamber when it opens and closes, and prevents air from flowing into the pump side, so there is no need to frequently stop the pump and bleed air as with conventional pumps. There is no need for any operations, and therefore, the efficiency of liquid transfer is improved and the labor and effort of the work is greatly reduced.

In addition, since this automatic opening/closing valve is purely mechanical, it does not require an explosion-proof structure like those that use electrical signals even when used to transfer flammable liquids. Since there is no need to specially provide a detector, a signal transmission line, a drive power source, and an opening/closing drive device, it is possible to provide the device at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of a conventional liquid transfer device. 10... Automatic opening/closing valve, 11... Exhaust valve, 12...
...Casing, 13...Valve chamber, 14...Inlet, 1
5... Outlet, 17... Outflow valve hole, 21... Float valve body, 30... Second casing, 31... Second
Valve chamber, 32...Exhaust pipe line, 33...Exhaust valve hole, 3
4...Second float valve body, 35...Transparent glass main body, 36...Exhaust pipe lower end opening.

Claims (1)

[Claims] 1. Has a valve chamber, has an inlet communicating with the valve chamber and is connected to a tank from which liquid is taken out, and has an outlet connected to the suction side of a liquid transfer pump. A casing, an outflow valve hole provided between the lower part of the valve chamber and the outlet, which is housed in the valve chamber, descends when the liquid level in the valve chamber is falling, closes the outflow valve hole, and causes the liquid level in the valve chamber to rise. an automatic opening/closing valve comprising a float valve body disposed to rise and open an outflow valve hole when the automatic opening/closing valve is in a state of and a second valve chamber with the other end of the exhaust pipe connected to the lower part at a position higher than the automatic on-off valve, so that the presence or absence of liquid inside the second valve chamber can be observed. a second portion formed at least partially of a transparent material;
a casing, an exhaust valve hole provided to communicate with the upper part of the second valve chamber and the outside; An automatic opening/closing system for a liquid suction system consisting of an exhaust valve that opens a valve hole and a second float valve body that is provided to rise when the liquid level in the second valve chamber rises and close the exhaust valve hole. Valve device.