JPH0796990A - Flexible container for transportation - Google Patents

Abstract

PURPOSE:To pressurize a liquid in a container to a set pressure at which the liquid does not flow, by providing an internal-pressure-adjusting inner bag, attached to a container body, with a pressure-air-introducing opening and an exhaust valve which sends out pressure air. CONSTITUTION:An inner bag 2 inflates by introducing pressure air into an inner bag 2 from an introducing opening 3 after filling a proper amount of a liquid into a container body 1 from a filling opening. Consequently the liquid in the container body l is pressurized according to the extent to which it inflated. This pressure is within a 0.2-0.3kg/cm<2> gauge. By this pressure the flow of the liquid is fixed, therefore this achieves transportation by the use of a transportation means such as a truck, a freight car, or etc., and a reduction in flow in the container body 1. When the liquid in the container body 1 expands due to an increase in the outside air temperature, etc., the exhaust valve 20 of the inner bag 2 opens to send out the air in the inner bag 2, and, thus, the pressure of the liquid in the container body l can be kept constant at all times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible container for transportation, which is filled with a liquid such as water or liquid chemicals and transported.

[0002]

2. Description of the Related Art Conventionally, it has been known to fill a flexible container with a liquid such as water or a chemical and transport it. Flexible containers made of rubberized cloth, etc.
The container is lightweight and can be folded and stored in a small volume when not in use. Therefore, it has an advantage that it is easy to handle and can be easily stored and transported. However, if the liquid is filled and used for transportation, the liquid in the flexible container may flow due to inertia due to a sudden change in acceleration during transportation, sudden start, sudden stop, curve, etc., which may damage the container. is there. Further, the deformation of the flexible container is likely to cause a load collapse or a rollover accident of a truck or the like on which the container is loaded.

As a method for solving this drawback,
In the invention described in JP-A-55-107674, the filling pressure of the liquid in the flexible container is set to 0.02.
It is described that the pressure is applied within the range of up to 0.3 kg / cm ² gauge. It is known that filling the liquid in the flexible container with such a pressure makes it difficult to change the shape of the flexible container and improves the shape retention.

In order to maintain this pressure, in another invention, as in the invention described in JP-A-57-17773, a flexible container after liquid filling is fastened by a belt from the outside, and the fastening pressure by this belt is adjusted. By doing so, an invention is known in which the pressure inside the container is kept in an optimum state and the deformation of the container is prevented.

[0005]

However, in all of the above-mentioned prior arts, the liquid is directly pressurized.
Therefore, when the liquid expands due to the influence of the outside air temperature or the like, the liquid is pressurized above the set pressure and the flexible container may be destroyed. In this case, even if the liquid is to be discharged to the outside for safety, if the liquid is a chemical or the like, it has a great influence on the surrounding environment, and thus it is extremely difficult to safely discharge the liquid. Becomes

The present invention is intended to solve the problems as described above, and makes it possible to easily pressurize a liquid in a flexible container to a set pressure that does not cause fluidity. In addition, when the liquid expands above the set pressure due to various other influences such as the influence of the outside temperature and a pressure rises, the pressure inside the flexible container is reduced, and the constant pressure inside the flexible container is always set. It tries to be able to keep it. Moreover, the operation of maintaining the constant pressure makes it possible to prevent any influence on the external environment.

[0007]

In order to solve the above-mentioned problems, the present invention mounts an inner bag for adjusting the internal pressure in a flexible container body of a sealed type, and the inner bag is attached to the outside of the container body. By forming an inlet for pressurized gas that can communicate with the inner bag and a discharge valve for discharging the pressurized gas inside when the pressure inside the inner bag exceeds a set pressure, the pressurized gas is introduced from the inlet. Is introduced into the inner bag to expand the inner bag and pressurize the liquid in the container body, and when the inner pressure of the inner bag rises above the set pressure, pressurized gas can be discharged from the discharge valve. It consists of

Further, the inlet of the pressurized gas may be such that the outside can be sealed with a lid via a check valve.

Further, a pressurized gas introducing pipe is connected to the outside of the check valve at the pressurized gas introducing port, and the introducing pipe is connected to a pressurized gas supply source through a pressure adjusting valve. It may be one.

Further, one inner bag may be provided inside the container body.

A plurality of inner bags may be provided inside the container body.

[0012]

Since the present invention is configured as described above, in order to inject the liquid into the flexible container, an appropriate amount of liquid is filled from the liquid injection port of the flexible container. In the filling of the liquid, it is not necessary to strictly limit the filling amount of the liquid as in the case of the conventionally known method, and the filling amount is allowed to fluctuate within a certain range. What happens is that after the filling of the liquid is completed, the pressurized gas is introduced into the inner bag from the inlet for the pressurized gas of the inner bag to expand the inner bag. The amount of pressurized gas introduced may be adjusted to arbitrarily adjust the expansion volume of the inner bag. Therefore, even if there is some error in the amount of liquid filled in the container body, the error can be sufficiently absorbed by adjusting the expansion amount of the inner bag.

By introducing the pressurized gas into the inner bag through the inlet, the pressure in the container body is set to the set pressure,
For example, when the pressure reaches 0.02 to 0.3 kg / cm ² gauge, the filling of the pressurized gas into the inner bag is stopped. In this state, the inside of the container body is maintained at the specified pressure, so that even if it is transported by a truck or the like, liquidity of the liquid is less likely to occur, and stable transport of the liquid is enabled by the flexible container.

When the liquid in the flexible container expands due to a rise in the outside temperature, the expanded liquid pressure is transmitted to the inner bag, so that the pressure in the inner bag rises above the set pressure. To do. A discharge valve provided in the inner bag senses this rise, and by opening the discharge valve, the pressurized gas in the inner bag is discharged to the outside. Since this release is to release the pressurized gas in the inner bag to the outside, if the pressurized gas is air or the like, there is no effect on the environment outside the flexible container.

As described above, according to the present invention, when the liquid in the flexible container is pressurized, the gas in the inner bag is discharged to the outside to easily adjust the liquid pressure in the container body. Therefore, the flexible container will not be damaged due to the expansion of the liquid or the like.

Further, if the inlet for the pressurized gas is sealed with the lid, it becomes easy and sure to prevent leakage of the pressurized gas filled in the inner bag.

Further, if a pressurizing gas introducing pipe is connected to the pressurizing gas introducing port and the introducing pipe is connected to a supply source of the pressurizing gas through a pressure adjusting valve, the liquid in the flexible container is When the volume contracts due to a decrease in outside temperature, etc., pressurization gas is additionally introduced into the inner bag from the inlet via the introduction port for pressurized gas to increase the pressure in the flexible container. The liquid pressure can be kept constant. By forming in this way, it is possible to prevent the pressurized gas from flowing due to a decrease in volume.

Further, according to the present invention, by applying a constant set pressure to the liquid, the liquid can be fixed without causing a flow. However, when the flexible container is moved by a transportation means such as a truck. However, due to traffic conditions, you may be forced to stop suddenly. In this case, the liquid has a certain fluidity due to inertia, and a strong pressure may be applied in one direction.

In many cases, the pressure due to the strong inertia breaks the flexible container or accelerates fatigue of the flexible container due to repeated rapid braking, rapid acceleration, and the like. In order to cope with such a situation, the inner bag may be formed at a plurality of locations on the container, for example, two locations on the front side and the rear side in the traveling direction of the flexible container.

With this structure, when a strong pressure due to inertia is applied to the front part of the flexible container by the sudden braking of the transportation means such as a truck, the inner bag is pressed in the front part. Exhaust gas through the exhaust valve. By this discharge, the pressure due to the inertia of the liquid in the front direction can be absorbed by the reduction of the inner bag.

On the contrary, when a strong liquid inertia acts in the rearward direction of the flexible container due to a sudden start or the like, the pressurized gas in the rearward inner bag is discharged to the outside from the discharge valve. It is also possible to prevent the flexible container from being damaged by absorbing the pressure applied to the flexible container due to the inertia of the.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (1) is a flexible container body, which is formed of rubberized cloth, for example, nylon base cloth coated with nitrile rubber on both sides. . Further, when a stronger container body (1) is to be formed, the above rubberized cloth may be formed by fastening it to both sides of a synthetic resin film to increase its strength.

The container body (1) is used by being loaded on transportation means such as a truck, and is fixed to these transportation means by an appropriate fixing means. Further, one inner bag (2) is located inside the container body (1) as shown in FIG.

The inner bag (2) is made of a rubberized cloth made of the same material as the container body (1), and is located inside the hermetically sealed container body (1) as shown in FIGS. It is a thing. And this inner bag (2) is the container body (1)
It forms an inlet (3) for pressurized gas that can communicate with the outside of the. As shown in FIG. 2, the inlet (3) is provided with a fixed body (4).
Is fixed to the inner circumference of the inner bag (2) with a fixed pulling cloth (5).
In addition, on the inner periphery of the fixed body (4),
(8) is fitted and fixed. Inner spiral groove (1) of this seat (8)
0), the lower end of the inlet main body (6) is screwed and fixed, and the seat (8)
A packing (11) is interposed between the and.

The central portion of the valve body (6) is fixed to the central portion of the inlet body (6) with metal or rubber, and the outer peripheral portion of the valve plate (12) is seated on the valve seat (13). Is in contact with. And, an inlet (3) for the pressurized gas provided in the outward direction
When pressurized gas is introduced from, the valve plate (12) is curved,
The valve seat (13) is opened so that pressurized gas can be introduced into the inner bag (2) through the intake hole (14).

Further, the lid body (16) is screwed and fixed to the outer end portion of the inlet main body (6) through the seal member (15), and the valve plate
Even if (12) is damaged, the pressurized gas can be prevented from flowing out. Further, a flange (17) is projected in the space between the introduction port body (6) and the lid body (16). By engaging the engagement piece (18) protruding from the lid body (16) with the flange (17), loss of the lid body (16) at the time of opening is prevented.

The inner bag (2) has a discharge valve (2) for the pressurized gas.
0) is formed. As shown in FIG. 3, this discharge valve (20) has a fixed body (21) fixed in the inner bag (2) by a fixed pulling cloth (5) and a discharge valve body (2) provided with a discharge port (33).
2) is projected to the outside of the container body 1, and the outer lid 23 is screwed and fixed to this protruding portion. And this outer lid
(23) has a closing valve body (2) inside a discharge valve body (22) which has a lead-out hole (24) opened in the center and is covered with a lid body (16).
6) is inserted. Then, the closing valve body (26) is pressed against the valve seat (19) of the discharge valve body (22) by the spring (25) interposed between the closing valve body (26) and the outer lid (23). As a result, a check valve that opens only in the discharge direction is formed. This discharge valve (20) is opened when the pressure in the inner bag (2) exceeds a certain pressure, and the pressurized gas in the inner bag (2) can be discharged to the outside through the outlet hole (24). I am trying.

Since the container body (1) is constructed as described above, an appropriate amount of liquid is filled from the filling port (27), and then the inner bag (2) is pressurized from the introducing port (3). When gas is introduced, the inner bag (2) expands. Then, the liquid in the container body (1) is pressurized according to the expanded amount. This pressurization can be performed within the range of 0.02 to 0.3 kg / cm ² gauge. By this pressurization, the liquid is fixed in flow and can be transferred by a transportation means such as a truck or a freight car, so that the liquid is less likely to flow in the container body (1).

When the liquid in the inner bag (2) expands due to a rise in the outside temperature, the discharge valve (20) opens and the gas in the inner bag (2) is released to the outside. By,
It is possible to always keep the pressure of the liquid in the container body (1) constant.

Further, in another embodiment, as shown in FIG. 6, an inlet pipe (28) for pressurized gas is connected to the inlet port (3), and this inlet pipe (28) is connected to a pressure regulating valve ( It shall be connected to the supply source (30) of the pressurized gas via 29). With this configuration, the liquid in the container body (1) is
When the volume is reduced due to a decrease in the outside temperature, etc., the inner bag
By supplying the pressurized gas to the inside of (2), it becomes possible to keep the pressure of the liquid constant and prevent the liquid from flowing.

In the above embodiment, the container body
Although one inner bag (2) is provided in (1), a plurality of inner bags (2) can be formed in the container body (1) as shown in FIG. 7 in a different embodiment. . In the embodiment shown in FIG. 7, one inner bag (2) is formed on each of the front part (31) and the rear part (32) of the container body (1).

With this structure, when the transportation body such as a truck is suddenly stopped due to a sudden brake or the like, the liquid in the container body (1) is inertial and the front portion (3)
1) A strong pressure is concentrated in the direction. But,
In the present embodiment, the pressurized gas whose pressure is increased in the inner bag (2) in the front direction is discharged from the discharge valve (20) to the outside, so that the pressure of the liquid in the front direction (31) increases. Can be prevented.

When pressure due to strong inertia is generated in the rear part (32) direction of the container body (1) due to a sudden start of a transporting body such as a truck, the inner bag in the rear part (32) direction.
By discharging the pressurized gas to the outside from the discharge valve (20) of (2), it becomes possible to act so as to weaken the pressure force due to the inertia of the liquid in the inner bag (2). .

[0034]

As described above, according to the present invention, the liquid filled in the flexible container can be easily pressurized to a constant pressure that does not cause flow.

Further, even if the liquid in the container body expands, it does not affect the surrounding environment and the like, and this expansion can be safely absorbed and the pressure of the liquid can be kept constant. Therefore, it is possible to prevent the container body from being damaged and to ensure safe transportation.

Further, by connecting the introduction pipe of the pressurized gas to the introduction port, even when the liquid in the container body is expanded or contracted, the expansion and contraction can be easily absorbed and the surrounding environment It is possible to always keep the pressure of the liquid constant regardless of the conditions. Therefore, it is possible to prevent the container body from being damaged or to generate a strong inertia due to the flow, so that the liquid can be safely transported by the flexible container.

Further, by providing a plurality of bag bodies, even when a sudden pressurization of the liquid occurs due to a sudden stop or sudden start of the transporter, a strong pressure is generated due to inertia in a specific portion of the container body. It can be prevented.

[Brief description of drawings]

FIG. 1 is a detailed view of an inner bag portion of a container body.

FIG. 2 is an enlarged cross-sectional view of an introduction port portion.

FIG. 3 is an enlarged sectional view of a discharge valve portion.

FIG. 4 is a partially cutaway overall view of a container body.

FIG. 5 is a plan view of the container body.

FIG. 6 is a partially cutaway overall view of a container body showing an embodiment in which a plurality of inner bags are provided.

FIG. 7 is a cross-sectional view of an embodiment in which a pressurized gas introduction pipe is provided at the introduction port.

[Explanation of symbols]

 1 Container Body 2 Inner Bag 3 Inlet Port 16 Lid 20 Discharge Valve 28 Inlet Pipe 29 Pressure Control Valve 30 Supply Source

Claims (5)

[Claims] 1. An inner bag for adjusting internal pressure is mounted in a hermetically sealed flexible container body, and an inlet for pressurized gas that can communicate with the outside of the container body is provided in the inner bag. By forming a discharge valve that discharges the pressurized gas inside to the outside when the pressure exceeds the set pressure, the pressurized gas is introduced into the inner bag from the inlet, and the inner bag is inflated to expand the container body. A flexible container for transportation that is capable of pressurizing the liquid inside and discharging the pressurized gas from the discharge valve when the internal pressure of the inner bag rises above the set pressure. 2. The flexible container for transportation according to claim 1, wherein the inlet of the pressurized gas is sealed with a lid on the outside through a check valve. 3. An inlet for pressurized gas is connected to an inlet pipe for pressurized gas outside the check valve, and this inlet pipe is connected to a supply source for pressurized gas via a pressure control valve. The flexible container for transportation according to claim 1, characterized in that. 4. The flexible container for transportation according to claim 1, wherein one inner bag is provided in the container body. 5. The flexible container for transportation according to claim 1 or 3, wherein a plurality of inner bags are provided in the container body.