JPS6143039Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved structure of a liquid storage container for storing, for example, liquefied nitrogen or liquid chemicals.

This type of container is often made of opaque metal materials, etc., or is constructed by stacking various types of insulating materials, so the remaining amount of liquid inside can be checked from the outside. It cannot be learned directly.

For this reason, it is conventionally known to measure the liquid level using an ultrasonic sensor or various semiconductor sensors, and to display this information externally.

However, these sensors are extremely expensive, difficult to install, and complicated to handle and maintain, so they have not been widely adopted.

Another common method is to measure the weight directly to determine the amount remaining, but this method cannot be accurate because the weight of the container is often heavier than the contents (liquid). The disadvantage is that the accuracy is poor and the error is large.

The most commonly used one utilizes a relatively inexpensive differential pressure gauge as shown in FIG.

However, in the conventional differential pressure gauge A, detection tubes C and D are connected to the top and bottom of a container body B, respectively, and are provided between these tubes.

However, with this configuration, in order to attach the differential pressure gauge A, two additional through holes E and F must be drilled in the container body and the detection tubes C and D must be connected thereto, making it difficult to manufacture them. is troublesome. Also, since the detection tubes C, D, etc. are located on the side of the container, they get in the way.
There is a high possibility that this will collide with other objects and cause damage. If it were to break, there was a risk that the internal liquid would leak out and cause an unexpected accident.

In particular, for containers that use insulation materials,
The insulation effect of the perforated area is significantly degraded, causing many problems.

Further, the differential pressure gauge A, which is a conventional detector, measures the height H' of the residual liquid amount as a differential pressure.

Therefore, as the remaining amount of liquid decreases, the differential pressure decreases, and the measurement error increases, making it impossible to accurately determine the actual remaining amount.

This invention was devised in view of the above-mentioned problems and to solve them, and its main purpose is to avoid making extra holes in the container body in order to install a detector for detecting differential pressure. It is an object of the present invention to provide a liquid storage container that can be arranged, is extremely simple to manufacture, can reduce costs, and does not cause unnecessary troubles.

Another object of the present invention is to provide a liquid storage container in which the lower the amount of liquid remaining in the container body, the higher its lift height, which will cause the detector to operate more accurately, allowing the amount of remaining liquid to be determined extremely accurately. It is on offer.

Still another object of the present invention is to provide the container body with a structure in which the container body has an opening for liquid injection at the upper part and a lid body that closes the opening so as to be openable and closable, and to connect the air supply pipe and the liquid drainage pipe to the liquid injection pipe. By adopting a structure that penetrates the lid body, adopting a so-called container, and installing a detector via a detection tube between the inlet side of the air pipe and the outlet side of the drain pipe, the container The object of the present invention is to provide an extremely ideal liquid storage container in which the main body only needs to be provided with an opening for liquid injection, and no other perforations are required.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of embodiments of the present invention will be explained below based on the drawings.

The liquid storage container 1 of the present invention consists of a container body 2, a drain pipe 3, an air supply pipe 4, a gas supply device 5, detection pipes 6 and 7, and a liquid column pressure type differential pressure detector. Department will be formed.

In the present embodiment shown in FIG. 1, the container body 2 is provided with an opening 9 for liquid injection in the upper part, and
It has a structure in which a lid body 10 is provided to open and close the opening 9 freely.

The drain pipe 3 is a so-called siphon pipe, and is a substantially inverted L-shaped pipe that extends from the vicinity of the bottom of the container body 2 to the outside via the top, and the liquid in the container body 2 is discharged to the outside through this pipe. . In the case of this embodiment, the upper part of the vertical pipe portion of the drain pipe 3 is configured to pass through the lid body 10. An appropriate hose or the like is connected to the outlet of the horizontal pipe portion of the drain pipe 3.

The air supply pipe 4 has one end opening at the top inside the container body 2 and the other end reaching the outside, and is used to guide gas such as pressurized air or pressurized inert gas into the container body 2. It is something.

In the case of the present embodiment shown in FIG. 1, the case is illustrated in which it is not provided directly on the container body 2 but on the lid 10. In this example, the drain pipe 3 is the so-called 2
The pipes are arranged so as to form a double pipe, and the outer peripheral pipe is used as the air supply pipe 4. The drain pipe 3 serving as an inner pipe is bent at a substantially right angle within the air pipe 4, and its horizontal pipe portion penetrates the wall of the air pipe 4 to reach the outside. Of course, the penetrating portion is welded or the like to maintain an airtight state.

The air supply pipe 4 is formed into a stepped diameter pipe in order to facilitate the above-mentioned configuration, and a gas supply device 5 is connected to the end, that is, the inlet, of the small diameter pipe portion.

In the case of this embodiment, the lower part of the large-diameter pipe portion of the air supply pipe 4 does not penetrate through the lid 10, but is bonded to the upper surface of the lid 10. Therefore, a drain pipe 3 is provided in the lid body 10.
A communication through-hole 4' is formed into which the holder is loosely fitted. This communication through hole 4' forms a part of the air pipe 4.

Of course, it is not necessary to configure it as in this embodiment, and it is sufficient to configure it so that the pressurized gas is fed into the container body 2 through the air supply pipe 4.

A gas supply device 5 connected to the inlet of the air pipe 4
is for pressurizing gas and force-feeding it into the container body 2 through the air supply pipe 4.

In the case of this embodiment shown in FIG.
A so-called pump is used. The hollow rubber ball 11 has check valves 12 and 12 at its inlet and outlet, respectively.
When the hollow rubber bulb 11 is contracted, the gas inside, in this case air, pushes open the check valve 12 on the outflow side and is pumped out, and when expanding, the outside air is passed through the inlet. It is of the form that suction is taken from the check valve 12 on the side.

FIG. 2 shows an example in which hollow rubber balls 11 are arranged in series, and one check valve 12 is also added. In the case of such a simple double-bulb pump, the presence of the next-stage hollow rubber bulb 11' allows the intake pressurized air to be rectified and pressure-regulated, making it possible to create stable pressurized air. Become.

The gas supply device 5 can also be connected to a gas source by using a compressor or the like instead of the hollow rubber bulb 11. Of course, a structure that pressurizes the enclosed gas may also be used.

Note that a branch pipe 13 is provided in a part of the large diameter pipe portion of the air supply pipe 4.
is connected, and is provided with a blow valve 14. This blow valve 14 is for discharging naturally vaporized liquid stored in the container body 2, and is opened at appropriate times and left open when storing the container for a long time. This is to prevent the gas pressure within the container body 2 from rising and the liquid from being unintentionally discharged through the drain pipe 3.

The present invention is applied to containers such as those described above.

In the present invention, the first detection pipe 6 is branched and provided on the inlet side X of the air supply pipe 4, and the first detection pipe 6 is provided branched on the inlet side
A second detection tube 7 is similarly branched and provided, and a detector 8 for detecting the differential pressure, such as a differential pressure gauge, is connected to the ends of both detection tubes 6 and 7.

If the liquid stored in the container body 2 is, for example, liquefied nitrogen, as shown in FIG. Since the liquefied nitrogen is vaporized as it passes through 7', the ends of the detection tubes 6 and 7 both become gas, and for example, a magnetic helix type differential pressure gauge (trade name) can be used.

Of course, if it is a differential pressure gauge that measures the differential pressure between gas and liquid, the detection tube 7 does not need to be configured as described above.

Furthermore, when using a differential pressure gauge that can only measure the differential pressure between gases, and in the case of a liquid that cannot be easily vaporized, such as nitrogen, a part of the detection tube 7 is blocked from the liquid and only that pressure is transmitted. For example, a diaphragm may be provided with a piston-type cylinder or the like interposed therein, and a gas may be filled in the conduit between the isolation mechanism and the differential pressure gauge.

In this way, the liquid pressure is not directly applied to the differential pressure gauge, but is applied after being transmitted to the gas, so that the differential pressure gauge is not damaged.

Next, the action will be explained.

In FIG. 1, a hollow rubber bulb 11, which is a gas supply device 5, is held in a hand to expand and contract, and outside air is sucked in from the inlet and pressurized, and then passed through the air supply pipe 4 and the communication through hole 4' to the container body. Pressurized air is pumped into 2.

Then, the liquid L stored in the container body 2
The liquid level is pushed by the gas G, and the liquid L flows into the drain pipe 3.
It flows in from the lower opening of the tube 3 and rises inside the same tube 3 to reach the outlet.

On the other hand, the detector 8 detects the pressure on the outlet side Y of the drain pipe 3 and the pressure on the inlet side X of the air supply pipe 4 via the detection tubes 6 and 7, and measures and displays the differential pressure.

In the case of the present invention, the height from the liquid level of the liquid L to the outlet side Y of the drain pipe 3 is the head H, and the more the liquid L decreases, the greater this head H becomes.

Therefore, when the differential pressure is measured by the detector 8, the accuracy is increased and the amount of remaining liquid can be accurately determined.

Incidentally, the present invention, as shown in the present embodiment shown in Fig. 1,
The present invention is not limited to a structure in which a drain pipe 3 and an air supply pipe 4 are provided at the lid 10, or a structure in which both pipes 3 and 4 are a double pipe.

For example, as shown in FIG.
may be a container that is provided in the container body 2 itself, and in which a liquid injection opening 9 formed elsewhere in the container body 2 is closed with a lid 10.

If liquid can be injected using the drain pipe 3 or the air supply pipe 4, a container having a structure in which the opening 9 and the lid 10 described above are omitted may be used.

Furthermore, as shown in FIG. 6, the present invention is also adopted in a device in which the gas supply device 5 is modified and configured as a so-called pressurization device in which a liquid drain pipe 3, an air supply pipe 4, and a lid body 10 are compactly assembled. It is possible.

As is well known, the pressurizing device is frequently used when handling liquefied substances such as liquefied nitrogen and liquefied oxygen.

The basic structure is that a vaporizing chamber 15 is formed in the middle of the air supply pipe 4, and a liquid suction pipe 16 is provided that communicates with the chamber 15 and extends to the bottom of the container body 2. Check valves 17 and 18 are provided in one portion and the outlet portion of the vaporization chamber 15, respectively.

In this case, the hollow rubber bulb 11'' is of a sealed type that pressurizes the internal gas.

In the figure, 19 indicates a packing.

In the case of such a configuration, hollow rubber bulb 1
1'', first, the check valve 17 is pushed open from the lower end of the liquid suction pipe 16, and the liquefied substance is sucked up and stored at the bottom of the vaporization chamber 15.

The liquefied material introduced into the vaporization chamber 15 is heated to an outside temperature that prevents it from coming out of the insulated container body 2, so it vaporizes and increases its volume. Of course, the vaporized gas fills up to the hollow rubber bulb 11'', and the vaporized gas is then pressurized.

This pressurized gas pushes open the check valve 18 provided at the outlet of the vaporization chamber 15, is introduced into the interior of the container body 2, and presses the liquefied material stored therein.

A device configured in this way does not use outside air because it generates its own pressurized gas.

Therefore, impurities are not sucked into the container body 2 along with the outside air, and at the same time, outside air at room temperature is not taken in and the liquefied material (low temperature) inside is not affected at all.

Furthermore, since a small amount of liquefied material is vaporized and the vaporized gas is used, the volume of the vaporized gas is considerably large, and therefore the number of times the hollow rubber bulb 11'' is expanded and contracted is reduced, making it extremely easy to remove the stored liquefied material. can be discharged.

In the case of the type that introduces outside air, if the stored liquefied material is liquefied nitrogen, for example, this is at a low temperature, so the outside air at room temperature is cooled and its volume decreases, so the hollow rubber bulb must be expanded and contracted quite a number of times. Pressure does not build up and it takes time to drain the stored liquid.

The present invention can be easily applied to such a structure.

That is, the detection tube 6 is connected to the so-called inlet side X of a part of the air pipe 4 arranged from the hollow rubber bulb 11'' to the vaporization chamber 15, and the detection tube 7 is connected to the outlet side Y of the drain pipe 3. , a detector 8 is installed at the end of both detection tubes 6 and 7.
This is to install a differential pressure gauge.

Even with something like this, it can be expected to have the same effects as the previous example.

The connection point of the detection tube 6 is not limited to the location shown in FIG. 6.

Of course, it goes without saying that the design can be appropriately modified to a structure other than the above-described embodiment based on the gist of the present invention.

As described above, according to the present invention, there is no need to make an extra hole in the container body in order to attach the detector, and the arrangement is extremely easy and costs can be reduced.

The detection tube is installed above the air supply tube and the drain tube outside the container body, and the detector is also placed in the same location, so there is less chance of damage from hitting other objects, and it is easy to read the differential pressure. It has the advantage of being easy.

In the present invention, as the remaining amount of liquid decreases, the lift height increases, so the differential pressure can be measured with high precision, and the accurate amount of remaining liquid can be determined with little error.

Furthermore, when the present invention is applied to a container in which the lid has an air supply pipe and a liquid drain pipe as shown in FIGS. 1 and 6, the opening of the container body is only an opening for injecting liquid; Since there are no other openings, manufacturing is extremely simplified.

Especially when using insulation materials,
This has various effects such as significantly reducing losses due to openings and making it possible to create an ideal container.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a liquid storage container according to the present invention. FIG. 2 is a vertical cross-sectional view of the main part of a gas supply device in which two hollow rubber balls are connected. Figure 3 shows
The main part perspective view which shows the modification of the detection tube in the case of storing liquefied nitrogen etc. FIG. 4 is a longitudinal cross-sectional schematic diagram showing a structure in which an air supply pipe and a drain pipe are provided directly on the container body, and a lid is provided separately. FIG. 5 is a vertical schematic diagram of a conventional structure. FIG. 6 is a longitudinal sectional view of a main part showing still another embodiment of the present invention. 1...Liquid storage container, 2...Container body, 3...
Drainage pipe, 4... Air supply pipe, 5... Gas supply device,
6, 7...detection tube, 8...detector, 9...opening,
10...Lid body, 11''...Sealed hollow rubber bulb, 1
5... Vaporization chamber, 16... Liquid suction pipe, 17, 18...
Check valve, G...Gas, L...Liquid, X...Inlet side, Y...Outlet side.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A container body that stores liquid, a drain pipe that reaches the outside from near the bottom of the container body through the upper part of the container body, and an air supply pipe that reaches the outside of the container body from the upper part of the container body. , a gas supply device connected to the air supply pipe for supplying pressurized gas, and by supplying the pressurized gas into the container body, the liquid in the container body is discharged through the drain pipe. In the liquid storage container, a liquid column type differential pressure detector is provided between the inlet side of the air supply pipe and the outlet side of the drain pipe for measuring the differential pressure between the two via detection pipes, respectively, A liquid storage container characterized in that the amount of liquid remaining in the container body is detected from the differential pressure corresponding to the lift height H between the liquid level and the outlet side of the drain pipe. 2. The container body has a structure in which an opening for liquid injection is provided at the upper part and a lid body that closes the opening so that the opening can be opened and closed, and an air supply pipe and a liquid drain pipe are provided to penetrate the lid body. A liquid storage container according to claim 1 of the utility model registration claim, characterized in that the liquid storage container has a structure. 3. A vaporization chamber in which a gas supply device is provided in a part of the air pipe, a sealed hollow rubber bulb connected to the vaporization chamber, and a liquid suction pipe that communicates with the vaporization chamber and reaches the bottom of the container body. Claim 1 of the utility model registration claim is characterized in that the structure includes a check valve provided in a part of the liquid suction pipe and another check valve provided at the outlet of the vaporization chamber. Liquid storage container.