JPS61178873A - Pressure vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pressure vessel, and more particularly to an improvement in a vessel having a partition wall and containing a pressurized fluid.

(Prior Art and Its Problems) Pressurized containers are generally used to contain fluids such as liquids, semi-viscous materials, and viscous materials.

For example, one type of liquid is called aerosol. In such cans, a partition wall is used to separate the fluid from the propellant in order to prevent the formation of a vacuum state. Such partition walls include piston-type ones, film-type ones that are removably sprayed onto a film bag, and bag-type ones.

In the case of the piston type, a free piston movable inside the can constitutes the septum. U.S. Patent No. 4,
An example of this can be found in No. 171,757. This can be used for a variety of fluids, but since a piston cannot form a leak-free partition on the 4M wall of a can, it cannot be used for fluids that bypass the piston. It cannot be used for deformed cans, cans whose diameter changes in the height direction, or deformed cans. This is because the movement of the piston makes sealing difficult.

In the film version, a plastic compound is sprayed onto the side and bottom walls of the can. When fluid is propelled through the can, the film is pushed up by a pressurized propellant underneath, causing the film to The bag is peeled away from the side and bottom walls of the can to force fluid out and is peeled from the bottom upwards so that the bag is not pinched and flow interruptions are avoided. However, the disadvantage is that the can must be quite hard to ensure uniform stripping of the bag, and its production costs are very high.

There are various ways to make bag-shaped items. For example, you can put it inside a can, pull out a portion, and reseal it by hanging it on the rim of the can. In either case, it is necessary to make special creases in the bag or to insert a collection tube into the bag to prevent it from becoming misshapen, becoming jammed, or interrupting the flow during fluid propulsion. Because of the need to form folds and the like in this manner, bag-type cans are expensive, and the same is true when using zero-recovery cans, which have the disadvantage of tearing at the edges of the can.

An improved version of the bag type is one in which the bag is fixed to the can either at the top or at the bottom. Although the shape of the bag is not specified, there is a disadvantage in this case that the fluid in the can cannot be completely pushed out, that is, cannot be propelled.

Another example is one in which the bag is partially fixed along the height of the can. In this case, the position of the bag relative to the height of the can is predetermined, so that the fluid in the can can be completely propelled. However, this product is limited in its use. That is, it is effective only for specific propellants and specific cans. Propulsion material.

For example, in the case of a can where the position of the bag relative to the can is predetermined by the can design, which has a different occupation ratio to the total volume of the can depending on the type of gas propellant or liquid propellant, the can and the bag to be combined with it ( This is why cans that can be used universally are desired.

Conventionally used cans are thick and hard. Therefore, it is necessary to create a seal between the can and the bag.

It is advantageous to use a container with a thin, expandable chamber because it is inexpensive. In addition, it is easy to attach the bulkhead to the can.

(Basic Structure of the Invention) An object of the present invention is to provide a pressurized container that is low in cost, can completely propel a fluid, and has universality.

That is, the pressurized container of the present invention consists of a can defining a chamber, a flexible partition provided within the chamber, and means for constructing the partition on the can, and the can has a side wall surrounding the chamber and an exhaust. It has an upper end with an outlet and a lower end opposite thereto, and the side wall of the can is flexible and expands when the chamber is pressurized and returns to its original state when the pressure inside the chamber becomes zero. , when the pressure inside the chamber reaches from 0 to 100 psi, the dimension of the can side wall increases in the direction across the chamber by 1/100 of its original size, and the septum divides the chamber into a fluid chamber containing fluid. The partition wall is pressurized and expanded toward the fluid chamber, and the propellant cell chamber houses the propellant material for discharging fluid from the discharge port.The construction means seals the partition wall to the side wall of the can, and The fluid and propellant are prevented from leaking during expansion, and the septum expands toward the lower end when fluid is first injected into the fluid chamber and gradually expands toward the upper end when pressure is applied by the propellant. is possible.

(Embodiment) In FIG. 2, the pressurized container of the present invention has a cylindrical can 10 consisting of a side wall 12, an open upper end 14, and a closed lower end 16. Circumferential strip 1
7 and a central recess 18 are formed, but the shape of the lower end is not limited to this. A hole 19 that can be plugged is formed at the top of the recess 16. This hole 19 is for injecting and pressurizing the propellant after the upper end 14 is closed, and a plug 21 is inserted into this hole.

This material can be anything that can maintain internal pressure, such as metal, paper, or plastic, but metal is generally safe.

The thickness of the present invention is such that it can expand sufficiently when the inside is pressurized, which is also advantageous from the point of view of cost. Therefore, since the transverse dimension must be such that it can stretch even at low W, the thickness of the side wall is approximately 0.0045 to 0.008 inch in the case of iron or aluminum. It may be less than 0.0045 inch, in which case the contained fluid and propellant will be exposed to temperatures from 30 to 130'F and its diameter will increase by as much as 0.02 to 0.00 inch. When the pressure increases from 0 to 100 psi, the diameter of the can increases by 17 or more than 1000 when not expanded. If the diameter were 2.50 inches, that would be an increase of over 0.025 inches.

0.00 between this side wall and the ring that supports the septum within.
Since a gap of even one inch can cause leakage of the propellant and the fluid contained therein, the pressurized vessel of the present invention includes special means for erecting the bulkhead in a sealing manner.

Since the propellant does not mix with the fluid in the can, its initial pressure and volume need not be very large; if the fluid is very fluid and a large discharge valve is used, the pressure will be lower than the can. It is very low at ~60 psi, compared to 90~100 psi for conventional aerosols.
It also becomes. Since the internal pressure is thus low, no strain is placed on the seal, and a thin structure can be used. However, in the case of a high pressure such as 20 psi of the side wall l partition, it is necessary to have a certain thickness.

Gas or liquid materials are used as the propellant.

In the case of gas propellant, its occupancy ratio is 173 to 1 of the total
/4th place. In the case of liquefied gas propellant, 17 cans 10~
Set it to 1150th place.

Although there is no particular choice, it is preferable to use one that accommodates the bulkhead and makes the propellant chamber as small as possible.

As a fluid, viscosity can 10. It can store anything from liquids with a QOOc ps level to foods such as cheese with a 300,000 cps level. It may also be something with very low viscosity, such as water or alcohol. 3rd~
A cup-shaped partition wall 20 is used in the pressurized container shown in FIG. The surface area of the partition wall is formed by folding a larger sheet or the like. The cup-shaped septum, which may be provided with pockets and may be cylindrical or flat, has side walls 22 and is closed at the bottom. A flat object may be deformed during use. In addition, the material used is flexible and durable against fluids and propellants. The manufacturing method is not particularly limited.

The material should have a certain degree of elongation, but it should not exhibit too much elongation. For example, relatively inexpensive plastic sheets such as polyethylene, polypropylene, Miral, Saran, etc. can be bent and formed into a cup shape. Paper or cloth may also be used. Aluminum films, metallized plastics, etc. are also suitable.

There are various means for installing the partition wall 2o on the side wall 12 of the can 10. Basically, it must be possible to maintain a complete seal during inflation, and in many cases a seal can be easily maintained if the side wall 12 is smooth and continuous. There are ring seals, adhesive seals, and welded seals.

Shown in Figures 1.3-5 are ring seals. Bulkhead 2
A tightening ring 24 is inserted within the cup and is located near the upper end 26 of the cup. The bulkhead 20 is attached to the can l along with the tightening ring 24.
, and is positioned slightly apart from the upper end 14 of the .

The dimensions of this tightening ring 24 and the partition wall are as follows:
The septum 20 is chosen to tightly hold the septum 20 in the can 10 tightly around the side wall 12 of the can 10, thereby dividing the can 10 into an upper fluid chamber 30 and a lower propellant chamber. The bulkhead is sized and shaped to match the position of the can 10 and the locking ring 24 so that when the septum is fully inflated, it extends toward and contacts the bottom of the fluid-filled container. extends upwards to touch the cover when empty. The septum 20 can be slightly larger than the top, but it is preferred that the septum fills the top when fully flexed, so that there is no pinching and all the fluid is forced out. Therefore, there is no need to use a pipe or the like to prevent pinching, and any valve may be used at the outlet.

When using a liquefied gas propellant, the volume of the fluid chamber 30 is considerably larger than that of the propellant chamber 32, with a ratio of 1:1.
5 to 20 partition walls to maximize the internal space for fluid storage.

For use with pressurized gas propellants, the ratio of the initial volume of fluid chamber 30 to that of propellant chamber 32 is on the order of 2-3:1. To accommodate chambers of such different volumes within standard dimensions and obtain the correct volume ratio between the chambers 30, 32, the position of the tightening ring 24 and the septum along the height of the chambers 30, 32 must be appropriately chosen. is desirable.

Since the present invention is intended to completely expel the fluid in the atrioventricular chamber 30, the atrioventricular chamber is curved and has a shape and size that presses against the inside of the cover to force out the fluid. Prevent it from expanding and becoming wrinkled or bent.

The external force of the tightening ring 24 on the side wall 12 completely seals the chambers 30, 32 at the side wall of the can. Since the pressures in both chambers are equal when the discharge valve 38 is closed and approximately equal when it is open, the tightening ring 24 does not move along the circumference of side wall 12.

Once chamber 30 is filled with fluid and chamber 32 is filled with propellant, the can is pressurized. This initial pressure causes the sidewall diameter to increase slightly. For example, if it is made of aluminum with a diameter of 2.5 inches and a thickness of 0.005 inches, the
When pressurized to pst, the diameter increases by <0.004 inch. If this expansion is not compensated for, a gap will form between the inside of the sidewall and the outside of the tightening ring 24. Then, the fluid and the propellant leak together, the pressure in the can drops, and the propellant leaks from the discharge valve, making it impossible to completely push out the fluid.

Various tightening rings are used to prevent such accidents.

The tightening ring 24 is preloaded with a radially expandable elastic seal so that even if one can expands under rotating pressure, the rings expand together to maintain a seal. As shown in FIG.
The rows are provided with uninterrupted flexible flanges 44 circumferentially, each having a diameter larger than that of the expanded one under recompression. The flange 44 is sufficiently thin and flexible,
When the clamping ring 24 is loaded into the can, it is biased inwardly and lies flat against the circumference 42 of the ring. As the can expands when it is compressed, the flange flexes slightly outward and presses against the inner surface of the can, pressing the partition wall against the side wall to maintain a seal.

In the example of FIG. 7, the ring 46 is a rigid annular body having a groove 48 around its circumference that opens radially outward. A flexible sealing element 50 is accommodated in this groove as an O-ring, the diameter of which is slightly larger than the inner diameter of the can when inflated, i.e. the sealing element 50 engages the side wall of the O-can to be compressed. As the sealing element 50 expands, the sealing element 50 attempts to remain unbiased and is biased outwardly against the septum to maintain a seal.

Another example is shown in FIG. 8, where the above-mentioned metal can undergoes some changes under recompression. If the side wall changes slightly without causing permanent deformation, the flexibility of one can will attempt to maintain its original shape. It's large. When such a ring 54 is loaded, the side wall will slightly conform until the ring 54 turns and settles into position without being unduly pulled or deforming the side wall.
Thus, the seal is maintained and leakage is eliminated.

Dimension the ring 54 such that it stretches the sidewall beyond the diameter at which the can will expand at maximum load pressure and maximum expected temperature, but does not exceed the yield point of the material. If the 005 sidewall is pressurized to 60 psi at 70°F, its expansion is about 0.004 inch, and the inner diameter is 2.5
04 inches. This results in a stress of 15,000 p.
Becomes the s i position. The side wall is at least 2/1000 of the original diameter.
The outer diameter of the ring 54 is determined so that it is expanded to about 4/1000. This expansion keeps the can sealed. This creates a stress in the ring of S''33,750 psi, which is well below the yield point of aluminum cans and rings. Even with an internal pressure of 100 psi at 70'F in this can, 2,50 fins. The can only expands and the stress is 25,000 p s i. Therefore, under any foreseeable conditions, the inner diameter of the can will not exceed the outer diameter of the ring and a good seal will be maintained.

All of the above sealing techniques rely on the flexibility of at least one of the rings.

FIG. 3 shows an example of a recirculating pressure container with such a seal. The upper end 14 of the zero can is closed by a dome-shaped upper cover 34, and a hole 37 formed in the top 36 of this cover 34 is closed. A sealed exhaust valve 38 is provided.

It is also connected to the upper end of the can at its circumference 39.

Fluid is filled prior to installation of this drain valve 38.

The septum 20 then moves toward the bottom until the septum 20 and the fluid chamber 30 are filled to the bottom of the top cover 34. Then the hole 37 is plugged by the drain valve 38. Further, the propellant chamber 32 is filled with gas or liquefied propellant, and when the pressure reaches a certain level, the hole 19 is closed by the plug 21.

Figure 4 shows the state of the partition wall 2 after some of the fluid has been pushed out.
It can be seen that 0 is slightly deformed.

Since the partition wall is installed at the center of the height of the side wall 12, the partition wall moves downward and then rolls up as shown in FIG. Therefore, the partition wall is not pinched, and the position and shape of the tightening ring 24 is determined so that the space surrounded by the upper cover 34 and the side wall 12 is above the tightening ring 24 when this state occurs. It is being When the fluid chamber 30 is full, the septum fills the space bounded by the lower end 16 and the side walls 12, so that the fluid fills the space without overflowing and is completely forced out when the septum is rolled up.

Since the pressure difference across the bulkhead is quite small, the clamping ring 2
The bulkhead 20 may be attached directly to the side wall 12 without the seal 64, an example of which is shown in FIG. In this case, the seal 64 and the circumference 62 of the septum can be expanded and contracted to accommodate changes in the diameter of the can.

When welding is used to form the seal 64, only the upper end 62 of the septum is flexible to compensate for changes in can diameter. Welding may be by heat, sonic or radio frequency heating. Both the septum and the adhesive must be extensible to avoid tearing.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a partition wall before it is attached to a can, Fig. 2' is a cross-sectional side view showing the can before a partition wall is attached to it, and Fig. 3
The figure is a cross-sectional side view showing an example of a pressurized container of the present invention having a can equipped with a partition wall, Figure 4 is a cross-sectional view of the can after fluid has been injected and the can has been slightly pushed out, and Figure 5 is a cross-sectional view of the can after all the fluid has been pushed out. 6 to 8 are cross-sectional side views showing several examples of sealing rings, and FIG. 9 is a perspective view showing another example of a pressurized container. 10... Can 12... Side wall 20...
・Partition wall 22...Side wall 24...Tightening ring 30...Fluid chamber 32...Propellant chamber 38...Discharge valve patent application agent Patent attorney Sugawara -Part 7 Yuan-゛': jyo, 'ko7:2 no change) -2 momo=S--23zcy:6- February 28, 1985

Claims (1)

[Scope of Claims] [1] Consisting of a can that defines a chamber, a flexible partition provided within the chamber, and means for constructing the partition on the can; It has an upper end with an outlet and an opposite lower end, and the side wall of the can is flexible and expands when the chamber is pressurized and returns to its original state when the pressure inside the chamber becomes zero. and when the pressure inside the chamber reaches from 0 to 100 psi, the dimension of the side wall of the can increases in the direction across the chamber by 1/1000 of its original size, and the septum divides the chamber into a fluid chamber containing fluid. and a propulsion chamber that accommodates a propellant for pressurizing the partition wall and expanding it toward the fluid chamber and discharging the fluid from the discharge port, and the construction means seals the partition wall to the side wall of the can, The fluid and propellant are prevented from leaking when the septum expands, and the septum expands toward the lower end when fluid is first injected into the fluid chamber and gradually toward the upper end when pressure is applied by the propellant. A pressurized container that is capable of expanding. [2] The container according to claim [1], wherein the partition wall has a surface area larger than the cross section of the side wall of the can. [3] Claim 1 in which the partition wall is installed on the side wall of the can and has a size and shape such that it fills the upper end of the side wall of the can and, when fully inflated, meets the top lid and discharges fluid. The container described in [1]. [4] The container according to claim [3], wherein the partition wall is a cup-shaped bag and is turned inside out when expanded toward the upper end. [5] A cup-shaped bag has an upper opening formed at an end that is built on the side wall of the can, and a closed bottom, and the cup-shaped bag has an end that is built on the side wall of the can. The container according to claim 4, wherein the container is deformable between a lower initial position and a final position in which the bottom is turned over above the end. [6] A patent claim in which the upper cover fitted to the upper end of the side wall of the can has a discharge port and retains the fluid in the fluid chamber, and the discharge port is provided with a discharge valve to control the discharge of the fluid. The container according to item [5]. [7] The container according to claim [4], wherein the cup-shaped bag has substantially uniform thickness and flexibility. [8] The container according to claim [4], wherein the cup-shaped bag is made of a plastic sheet material, a metallized plastic sheet material, or a metal film. [9] The side wall of the can has an upper cover portion, the upper cover portion and the upper end of the side wall of the can constitute the upper end surface, and the partition wall is slightly larger than the upper end surface and displaces fluid when fully inflated. The container according to claim 3, which is adapted to prevent the container from becoming trapped. [10] The container according to claim [1], wherein the can side wall is a smooth continuous linear surface. [11] The container according to claim [1], wherein the construction means includes an adhesive, and at least one of the adhesive and the partition wall can be expanded and contracted to maintain a seal. [12] The container according to claim [1], wherein the erection means has a melt seal, and the partition wall can expand and contract to maintain the seal. [13] The can side wall is cylindrical, the erection means has a ring installed inside the end of the partition wall and seals the partition wall to the can side wall, and at least one of the ring and the can side wall is fully The ring is flexible to form a seal when the ring is installed in the side wall of the can, and the ring is flexibly pressed against the side wall of the can to form a seal when the can expands. The container according to claim 1, which maintains the following properties. [14] The container according to claim [13], wherein the ring cooperates with the can and can be provided at any height position on the side wall of the can. [15] The ring has a circumference facing the can side wall, and means is provided on this circumference that can expand and contract to engage with the can side wall, and this means connects the ring and the partition wall to the can chamber. It has dimensions relative to the diameter of the can that cause it to contract unevenly when installed in the chamber, and when the can chamber is pressurized and the diameter of the side wall of the can gradually increases, this means expands and the ring The container according to claim 13, wherein a seal is maintained between the circumference of the container and the side wall of the container. [16] The container according to claim [15], wherein the means capable of expanding and contracting has a deflectable flange having an angle on the circumference of the ring. [17] The container according to claim [16], wherein a plurality of flanges are arranged vertically on the circumference of the ring. [18] The ring has an annular groove on its circumference,
18. A container according to claim 17, in which the compressible flexible element has a further ring surrounding said ring. [19] The ring is located within the can and has a diameter slightly larger than the can when the chamber is not pressurized so as to bias the can side wall without permanent deformation, and when the chamber is not pressurized. 14. A container according to claim 13, wherein the ring has a diameter that is larger than the diameter of the can side wall even when the diameter of the can side wall increases.