JPS5836702Y2 - Chemical tank with confirmation device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a chemical liquid tank equipped with a confirmation device that allows the presence or absence of a flow of chemical liquid flowing out from the chemical liquid tank in very small amounts to be clearly confirmed visually.

When pumping liquid from a tank, it is often necessary to ensure that a certain amount is pumped out.

If the tank and the connecting hose between the tank and the pump are all transparent, you can check whether there is liquid in the tank and whether there is a flow.

However, when the flow rate is small, it is difficult to confirm the presence or absence of flow.

Since the capacity of the tank is large, it is not possible to immediately tell whether the water level is dropping or stopping.

For example, in a steam generator, a diluted solution of a cleaning agent and an oxygen scavenger must be mixed into the boiler can water in fixed amounts.

For this purpose, for example, a 10 liter plastic container is filled with a chemical solution, and the chemical solution is supplied into the boiler can water at a rate of 6 cc per minute from a hose connected to the bottom.

Since the amount is extremely small, the presence or absence of flow cannot be determined from the drop or stoppage of the liquid level.

If the hose is transparent, you can only tell if there is a chemical in the hose.

However, if the chemical solution is transparent, it may be difficult to confirm the presence or absence of the solution.

Although the chemical liquid may be colored, if it is uncolored, it is difficult to confirm the presence or absence of the liquid.

If the pump is working and there is liquid in the hose, it is assumed that the liquid is flowing.

However, it is desirable to have something that can instantly confirm the presence or absence of liquid and the presence or absence of flow.

To check whether there is a flow, a flow meter can be inserted into the hose.

However, since it is sufficient to know whether there is or is not present, it is a waste to use a flowmeter.

It is desirable that it can be confirmed visually. It is difficult to visually recognize the flow of transparent liquid.

In a non-equilibrium state where gas and liquid coexist, a large number of gas-liquid interfaces are formed, and light is reflected from these interfaces, so the movement can be visually observed.

External energy is required to create a non-equilibrium state where gas and liquid coexist.

This is because the energy is higher than the equilibrium state.

For example, if a stirring blade is rotated in a tank, many microbubbles will be generated in the liquid.

If there is a flow of liquid in the hose, this can be recognized by the movement of bubbles.

However, this is not a good idea as it requires a new stirring blade and motor.

It goes without saying that it is ideal to utilize the energy of the mechanisms that originally exist.

By the way, since a pump is always used to pump out the chemical solution, the energy of the pump can be used to create a non-equilibrium state in which gas and liquid coexist.

From this point of view, the inventor of the present invention has pondered how to create a visually visible gas-liquid mixed state near the tank using pump power.

It is easier to create droplets in a gas than to create bubbles in a liquid.

When a liquid is discharged from inside a pipe into a gas, it can always become droplets, a filamentous flow, or a fountain.

In this case, the gas must exist within a closed space.

Since suction is performed using a pump, there must be no open space in the middle.

However, there are still difficulties in continuously discharging liquid into gas in a closed space.

This means that when liquid falls from above, it must be possible to prevent the gas below from escaping upwards.

Since the specific gravity of gas is extremely low, it enters the liquid and escapes to the top.

If this happens, the gas in the closed space will disappear and the non-equilibrium state will disappear.

This phenomenon can be prevented if the downward velocity of the liquid is large and the momentum is strong.

The gas cannot rise through the liquid and is pushed back into the jet.

However, as mentioned above, the flow rate of the liquid is extremely slow, so this is of no use.

A drip device is well known as a device that has a slow flow rate and allows gas to stably exist in the space below.

This connects the upper infusion bottle and the lower dropper with an extremely thin hollow needle about the size of a hypodermic needle.

Because the inner diameter of the needle is extremely narrow, the surface tension of the water makes it impossible for air bubbles to displace the water and enter the needle.

Therefore, the state of liquid above and gas below is maintained stably.

However, it is inappropriate to use small, fragile objects such as syringe needles for steam generators and other factory equipment.

It is inconvenient to handle and easily breaks.

It's also dangerous. How can we maintain a state of liquid above and gas below without using a needle?The only solution is to connect the liquid and gas with a tube, and make one part of the tube lower than the closed space of the gas.

Since the gas does not go below the level of the liquid, the gas cannot leak through the liquid from a closed space.

The present invention is based on this idea.

The structure of this invention is to provide a transparent cylinder on the side of the tank, connect the transparent cylinder and the bottom of the tank with a suction pipe, attach a connecting hose to the pump at the bottom end of the transparent cylinder, and further air the air inside the transparent cylinder. An expansion/contraction mechanism is provided to extract a certain amount of the material in advance.

Embodiments will be described below with reference to drawings showing examples.

FIG. 1 is a front view of a chemical liquid tank with a confirmation device according to an embodiment of the present invention, and FIG. 2 is a longitudinal right side view showing the operating situation.

A filter 2 is installed above the tank 1 for filling chemical solutions, etc.
is suspended, and the opening is covered with a lid 3.

A confirmation device 4 is provided on the side of the tank 1.

As shown in FIG. 2, the confirmation device 4 is composed of a transparent short cylinder 5, a pressurized suction device 6, a pressurized suction device communication pipe 7, a rubber connection pipe 8, a tank communication pipe 9, a discharge pipe 12, etc. The movement of the chemical solution dripping or flowing down little by little from the tank communication pipe 9 into the short cylindrical body 5 is visually confirmed from the outside.

The transparent short cylindrical body 5 has a round cylindrical shape and is made of Acnor resin, for example.

It only needs to be transparent, and it can be made of other plastics, glass, etc.

The pressurized suction device 6 is formed into a bellows-shaped cylinder whose top surface is closed using an elastic material such as plastic, rubber, or a thin metal plate, and when the head is pressed, it contracts and its internal volume decreases. When released, it expands due to elastic force and returns to its original shape.

The lower opening of the pressurized suction device 6 is connected to the pressurized suction device communication tube 7 of the transparent short cylindrical body 5 through a rubber connecting tube 8 .

That is, when the pressure suction device 6 is pressed, the gas inside the transparent short cylinder 5 is pressurized, and when it is released, the gas inside the short cylinder 5 is sucked and the pressure inside the short cylinder is reduced. Become.

The tank communication pipe 9 opens above the transparent short cylindrical body 5, and the other end passes through a through hole 10 bored in the side surface of the tank 1 and opens into the tank.

To maintain airtightness, the tank communication pipe is made of a double tube with a hard inner tube and a flexible outer tube.

The discharge pipe 12 provided below the transparent short cylinder 5 is connected to the transparent cylinder 5.
Connecting hose 1 connected to the inside of the unit and the pump (not shown)
Connect with 3.

The tank communication pipe 9 opens into the inside of the tank 1, and a suction pipe 11 is fitted into the open end.

The suction pipe 11 is a pipe made of flexible material, and is connected to the tank 1.
The other open end opens at the bottom of the.

The operation of the above configuration will be explained.

Start with tank 1 empty.

Remove the lid 3 and pour the chemical solution into the tank.

Close the lid when it is full.

Since the liquid level becomes higher than the opening of the tank communication pipe 9, the liquid passes through the suction pipe 11 and enters the transparent short cylinder 5.

The liquid level 14 inside the transparent short cylinder rises to the same height as the open end of the discharge pipe 12 and then stops.

If the liquid level 14 in the cylinder is at the same height as the opening end of the discharge pipe, it is not known whether the inside of the tank is empty or not.

The liquid level 14 in the cylinder must be raised higher.

Then, press the pressurized suction device 6 several times.

When the pressurized suction device is pressed, the air in the transparent short cylinder 5 passes through the suction pipe 11, enters the tank 1, becomes bubbles in the liquid, rises, and escapes to the upper space within the tank 1.

When the pressurized suction device 6 returns with its own restoring force, the suction pipe 1
1, the liquid flows backwards and is introduced into the transparent short cylinder 5.

The liquid level 14 in the cylinder rises and moves away from the open end of the discharge pipe 12.

After repeating the pressing operation of the pressurized suction device several times, the liquid level 14 rises to an appropriate position between the discharge pipe and the tank communication pipe 9.

A pump (not shown) is then activated.

The liquid escapes from the transparent short cylinder 5 through the connecting hose 13.

Then, the pressure inside the transparent short cylinder decreases, so liquid drips from the suction pipe 11 and is replenished.

In the end, the volume of air within the transparent short cylinder 5 remains unchanged.

Since the tank communication pipe 9 is open to the air, the liquid forms an elongated thread-like flow or falls as droplets.

By observing the presence of filamentous flow and droplets from the outside, the presence of flow,
You can know non-existence.

Since it is a non-equilibrium state where gas and liquid coexist, movement can be observed visually.

Transparent short cylinder body 5, tank communication pipe 9, pressurized suction device communication pipe 7
The discharge pipe 12 can also be made all at once by plastic molding or glass processing.

However, you must pay attention to the vertical relationship of each member.

Based on the position of the pump, the height of each is Ha...
... Tank bottom Hb ... Tank liquid level Hc ... Discharge pipe top end Hd ... Transparent short cylinder liquid level He ... Tank communication pipe opening Hf... Pressurized suction device communication tube opening end Although the pressure suction device is used to raise the liquid level in the cylinder, Hf>Hd.

Since filamentous flow and droplets must occur, He>Hd It is.

Since it is possible to know the presence or absence of liquid in the tank, Hd>Hc It is.

The hierarchical relationship between Hf and He is not determined. In the end, the pressurized suction device communication pipe and the tank communication pipe may be provided above the transparent short cylinder, and the discharge pipe may be provided below, so that the liquid level is located between them.

In order to prevent the air trapped inside the transparent short cylinder from escaping, He>Ha Must.

This is to maintain a gas-liquid non-equilibrium state.

This means that the verification device must be attached to the side of the tank.

The height Hb of the tank water level is arbitrary and only needs to be above the bottom.Hb>Ha However, the pressure inside the transparent short cylinder is (Hb-He), which may be above atmospheric pressure or below atmospheric pressure.

However, the suction pressure Hp of the pump is Hp>(He-)! b) As long as the tank liquid level Hb is low, the pump can suck the liquid from the transparent short cylinder.

Conversely, since there is a powerful pump, a confirmation device can be attached to the side of the tank.

For example, it is sufficient to use a diaphragm pump with a water head of 5 m.

The absolute value of (He-Hb) is only about several tens of cm.

Instead of the pressurized suction device 6, any volume variable expansion/contraction mechanism can be used.

Of course, this requires (He −Hb) negative pressure is applied, so you have to withstand this 1/) It may also be a combination of a piston and a spring.

A syringe and a spring may be combined. A suitably hard rubber cap will also work.

Any material may be used as long as it does not undergo chemical changes due to the chemical solution and will not be dented by the above negative pressure.

The tank of the present invention can also be used for disinfection by containing chlorine sterilizer.

In addition, this can be used when delivering a small amount of liquid in fixed amounts.

An example of quantitatively feeding a cleaning agent and an oxygen scavenger to a steam generator will be briefly explained with reference to FIG.

From the chemical solution tank A of this invention, the clarifier and dechlorinator chemicals are:
Via a pump 21 it enters a hot well 23 where it passes through a softener 22 and is mixed with softened water.

The mixed water is supplied by a valve 24, a strainer 25, a water supply pump 26,
It is poured into a heating pipe 29 through a constant flow valve 27 and a check valve 28.

Here, it becomes a mixed steam, which is separated into steam and circulating water in the steam/water separator 30.

The circulating water is passed through the steam trap 31. It returns to the hot well 23 via the check valve 32.

Steam is taken out from the steam separator 30 and used. Fuel is fed from the tank 42 to the burner 43.

The cleaning agent and oxygen absorber in the chemical tank prevent scale from adhering to the inside of the can.

For this reason, the water must flow in small streams without interruption.

According to the present invention, the presence or absence of a chemical solution and the presence or absence of a flow can be checked extremely easily.

This is a useful idea.

[Brief explanation of drawings]

FIG. 1 is a front view of a chemical liquid tank with a confirmation device according to an embodiment of the present invention, FIG. 2 is a vertical right side view showing the operating state, and FIG. 3 is a system diagram of a steam generator. 1 is the tank, 2 is the filter, 3 is the lid, 4 is the confirmation device,
5 is a transparent short cylinder, 6 is a pressurized suction device, 7 is a pressurized suction device communication tube, 8 is a rubber connection tube, 9 is a tank communication tube, 10 is a through hole, 11 is a suction pipe, 12 is a discharge 13 is the connecting hose, 14 is the water surface inside the transparent cylinder, and 15 is the water surface of the tank.

Claims (2)

[Scope of utility model registration request] (1) A chemical liquid tank 1; A transparent short cylindrical body 5 that is attached above the side surface of the chemical liquid tank 1 and has a discharge pipe 12 below which is connected to the suction side of the pump; Above the side surface of the short cylindrical body 5 and a suction pipe 11 that communicates with the bottom of the chemical solution tank 1; and a suction pipe 11 that communicates with the bottom of the transparent short cylinder 5;
It consists of a pressurized suction device 6 for pressurizing and depressurizing the inside, and is equipped with a confirmation device characterized in that the presence or absence of a medicinal solution flow can be visually confirmed from the outside of the transparent short cylindrical body 5. Chemical tank. (2) A chemical solution tank with a confirmation device according to claim 1, in which the pressurized suction device 6 is made of an elastic material and has a bellows-like cylinder whose upper surface is closed.