JPH0520631B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is mainly applicable to pipes for transferring liquid when a liquid is sucked into a large tank by a pump from a small tank, for example, a tank truck. This invention relates to an automatic on-off valve that is installed in a small tank 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.
The liquid is transferred to a large tank 7 via a collecting pipe 4 and a liquid feeding pump 6 equipped with a pressure gauge 5 on the suction 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, since the on-off valve 3 is a manual on-off valve, there is a problem that it takes time and effort, and furthermore, an air bleed operation is required every time one of the tanks 1 is empty. Another problem is that it requires a lot of time and effort. Since the pump 6 is stopped each time the air bleed operation is performed, 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 automatically closes the liquid passage when the small tank in the suction pipe system of the liquid pump becomes empty to prevent air from being sucked into the pump, and prevents air from being sucked into the pump. An object of the present invention is to provide a mechanical automatic opening/closing valve that automatically exhausts air into the atmosphere and opens a liquid passage when a small tank is connected and oil transfer is resumed.

<Means for Solving the Problems> The automatic opening/closing valve for a fluid suction system of the present invention has a valve chamber, 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, and an exhaust valve hole provided between the upper part of the valve chamber and the outside. , is housed in the valve chamber and descends when the liquid level in the valve chamber is falling to close the outflow valve hole, and rises when the liquid level in the valve chamber is rising to open the outflow valve hole and close the air exhaust valve hole. It consists of a float valve body provided.

<Function> This automatic on-off valve is installed and used below the bottom of the tank to which the inlet 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 will flow in 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, and when the liquid level in the valve chamber rises, the lower outflow valve hole sinks below the liquid level, and the float valve The body floats up, the outflow valve hole opens, and only the liquid flows out to the outlet side. When most of the air in the valve chamber is exhausted, the float valve element reaches the upper part of the valve chamber and closes the exhaust hole. In this state, liquid is transferred.

When the tank from which the liquid is removed is empty, air finally flows into the valve chamber. As a result, the liquid level in the valve chamber falls, so the float valve element also falls, opening the exhaust valve hole and closing the outflow valve hole. Therefore, the air that has flowed into the valve chamber does not flow to the outlet side. When the connection on the inlet side is changed to a tank containing liquid, the liquid transfer is resumed in the same manner as described above.

<Example> An example is shown in FIG. In the figure, 10 is a casing, 11 is an outflow valve hole, 12 is an exhaust valve hole,
13 is a float valve body.

The casing 10 has a substantially cylindrical container shape and includes a main body 14 and a lid 15, and has a valve chamber 16 inside, and an inlet 1 communicating with the valve chamber 16 in the upper part of the main body 14.
7 is provided, and this inlet 17 is adapted to allow connection of a pipe. Also, on the opposite side of the inlet 17 is an outlet 18.
The outlet 18 communicates with the lower part of the valve chamber 16 via a passage 19 and an outflow valve hole 11. Outlet 18 can be connected to a pipe.

The outflow valve hole 11 is provided between the lower part of the valve chamber 16 and the outlet 18, and a rubber valve seat 20 is provided on the valve chamber 16 side.

The exhaust valve hole 12 is provided in the lid 15, and the exhaust valve hole 12 is provided in the lid 15.
6 and communicates the valve chamber 16 with the outside world. A rubber valve seat 21 is provided on the valve chamber 16 side of the exhaust valve hole 12.
is provided.

The float valve body 13 is a spherical body that is sufficiently lighter than the liquid to be transferred, and is configured so that it can contact the valve seats 20 and 21 at arbitrary positions on its outer surface to close the respective valve holes. In the figure, reference numeral 22 denotes a float valve holder, which comes into contact with the float valve body 13 when it descends, so that the height of the center of gravity of the float valve body 13 and the center of the outflow valve hole 11 coincide with each other. This increases the opening force. Reference numeral 23 denotes a float valve element abutting part, which abuts when the float valve element 13 floats up and regulates the float valve element 13 to properly seat on the valve seat 20 of the exhaust valve hole.

The automatic on-off valve 24 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 inlet is connected to the tank 1 side and the outlet is connected to the pump 6 side. 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 24 connected to that tank 1 from the inlet 17 and the valve chamber The liquid level in 16 falls. As a result, the float valve body 13, which had floated up until then and closed the exhaust valve hole 12, descends and closes the exhaust valve hole 12.
is opened, and the outflow valve hole 11, which had been open until then, is closed. Therefore, the incoming air flows through the outflow valve hole 11.
No air flows out from the pipe, and 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. When the connecting pipe 2 is disconnected from the empty tank 1 and another tank 1 filled with oil is connected, the connecting pipe 2 and the air in the valve chamber 16 of the automatic on-off valve 24 are opened to the exhaust valve hole 12. The oil is discharged from the valve chamber 16 and flows into the valve chamber 16. Since the liquid level in the valve chamber 16 rises as air is discharged, the float valve body 13 floats up, the outflow valve hole 11 opens, and only oil flows out into the collecting pipe 4. The floating valve body 13 is in the valve chamber 16
The exhaust valve hole 12 is closed when most of the air inside is exhausted to prevent oil from flowing out from the exhaust valve hole 12.

In the embodiment described above, an example of use 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 embodiment, when oil is transferred from a plurality of tanks 1 to a tank 7 using one pump 6,
The pressure gauge 5 can hardly detect that one tank 1 is empty. It is also unclear which tank 1 has become empty. This becomes a problem if the tank 1 does not have such equipment, such as a liquid level gauge. To solve this problem, either make the casing 10 of the above embodiment transparent or provide a see-through window.
Alternatively, a transparent level gauge with equalized pressure may be provided.
The point is that the liquid level in the valve chamber 16 can be observed.

In addition, if there is only one tank 1, the pressure gauge 5
By using the tank 1 due to the pressure drop,
can detect when it is empty.

<Effects of the Invention> When a pump is used to transfer oil, etc. from a tank to another tank, the automatic opening/closing valve of the present invention can be used in the suction system of the pump to transfer oil, etc. from the tank from which the oil, etc. is taken out. Automatic opening/closing function that automatically and purely mechanically closes the passage when the tank is empty, and then automatically and purely mechanically opens the passage when another tank containing oil, etc. is connected. Since it has a gas-liquid separation function that separates and exhausts the air in the valve chamber when opening and closing, and prevents air from flowing into the pump side, there is no need to frequently stop the pump and bleed air as with conventional valves. Therefore, it is possible to improve the liquid transfer efficiency and to greatly reduce the amount of work required.

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 the device does not require a special detector, signal transmission line, drive power source, or opening/closing drive device, it can be provided at 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 view showing one row of a conventional liquid transfer device. DESCRIPTION OF SYMBOLS 1...Tank from which liquid is taken out, 2...Connecting pipe, 6...Pump, 10...Casing, 11...
...Outflow valve hole, 12...Exhaust valve hole, 13...Float valve body, 16...Valve chamber, 17...Inlet, 18...
Exit, 19...Aisle.

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, an exhaust valve hole provided between the upper part of the valve chamber and the outside, and a liquid level in the valve chamber accommodated in the valve chamber in a lowered state. automatic opening/closing for a liquid absorption system, comprising a float valve body which is provided so as to descend to close the outflow valve hole, and rise when the liquid level in the valve chamber rises to open the outflow valve hole and close the exhaust valve hole; valve. 2. The automatic on-off valve for a liquid suction system according to claim 1, wherein the liquid level in the valve chamber can be observed.