JPH0217201Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a flexible, bag-shaped bladder made of a flexible elastic material inside a hollow container body with a rigid, airtight structure, and seals gas between the container body and the bladder. This relates to a pressure vessel in which liquid enters and exits from the bottom of the bladder, and is particularly suitable for large pressure vessels.

Conventionally, this type of pressure vessel was used in equipment that required a large amount of liquid at high pressure at regular intervals or on a regular basis, and was used to pump liquid with a small pump and discharge the accumulated liquid all at once when necessary. When sending via piping, it can be used to alleviate pressure changes such as when a pump starts and stops or when a valve suddenly closes, or in a liquid transportation system where the amount of liquid used is irregular, it can send liquid within a constant pressure range even when the pump is stopped. It is also used to store liquid in a piping system with a heating means such as a hot water boiler or a hot water storage tank so that when the liquid expands due to heat, the pressure will be within a predetermined pressure range. When liquid rapidly enters and exits such a pressure vessel, the bladder deforms rapidly. As the pressure vessel becomes larger, the bladder undergoes complex deformation due to the inertia of the internal liquid, weight, and flow, causing fatigue failure due to local constriction or local expansion and contraction. In addition, the outflow of the liquid is not constant, and when it flows out, it solidifies in the shape of a lump near the opening at the bottom, which may cause damage when the liquid is allowed to flow in.

Conventionally, in order to prevent the top of the bladder from collapsing when deflated and to allow smooth folding without eccentricity or twisting, thereby preventing damage to the bladder, Japanese Patent Application Laid-Open No. 53-88220 discloses that the inside of the top of the bladder is inverted. There is a proposal to provide a hanging member such as a conical shape, and to engage a hanging body extending downward from the center of the container body into a receiving hole formed from the upper surface of the hanging member as necessary. However, even if there is such a hanging member, the planar extent is small and the moment of force that resists twisting etc. is small.
Also, Utility Application No. 50-101906 (Utility Application No. 52-16021)
The specifications and drawings attached to the application of Utility Model Application No. 53-93461 (Utility Model Application No. 55-9975) both illustrate and explain that a tongue piece etc. provided at the top of the bladder is fixed to an air valve etc. There is. However, if the capacity of the bladder is within 0.5 m ³ , the methods shown in the above-mentioned publications are sufficiently practical, but if the capacity exceeds this, it becomes increasingly difficult.

This invention provides a pressure vessel that extends the life of the bladder by preventing strain from deforming the bladder due to the inflow and outflow of liquid, and is particularly suitable for large vessels.

Embodiments of this invention will be described below with reference to the drawings.

In one embodiment of this invention shown in FIGS. 1 to 3, reference numeral 10 denotes a rigid, airtight, hollow container body, usually made of a steel plate. Reference numeral 11 designates a support member integrated with the lower part of the container body, and 12 represents a connecting pipe connected to the entrance/exit port 13 in the lower part of the container body 10. Reference numeral 15 denotes a deformable, bag-shaped bladder made of a flexible elastic material such as rubber or soft synthetic resin, disposed inside the container body 10, with an opening 1 at the bottom.
6 is disposed at the entrance/exit 13 so that liquid can enter and exit, and the inside is used as a liquid chamber L. A cylindrical body 17 is made of a porous metal plate and is designed to prevent the bladder 15 from being pushed out from the inlet/outlet 13. Reference numeral 18 denotes a reinforcing band which is glued around the circumference of the bladder 15 in an annular shape along a portion that intersects with a plane when the bladder 15 is divided into two in the longitudinal direction. Like the bladder 15, this reinforcing band is made of a flexible elastic material such as rubber or soft synthetic resin. Reference numeral 20 denotes a metal attachment member that is adhesively attached to most of the upper surface of the reinforcing band 18. Reference numeral 21 denotes a mounting frame provided as a part of the container body 10 that extends across the upper center of the bladder 15, and a metal mounting member 20 is fixed thereto by a plurality of bolts 22. Therefore, the bladder 15 is fixed to the container body 10 from substantially one end to the other end including the center portion of the upper surface. Reference numeral 23 denotes an air inlet which first introduces a gas such as air into the air chamber G between the container body 10 and the bladder 15 and then seals it. 25 is a manhole through which people can enter and exit, but it is sealed; in some cases, a handhole may be provided in place of this manhole.

In the configuration as described above, when liquid is allowed to flow into the bladder 15, the state changes from the contracted state shown by the dotted line shown in FIG. When it flows out, it contracts approximately in the direction shown by arrow b, resulting in the state shown by the dotted line. In this case, the fluid flowing in and out causes the bladder 15 to be locally squeezed, locally expanded and contracted, or twisted, and the fluid flowing out causes the bladder 15 to be pushed toward the inlet/outlet 13. However, the portion of the upper surface of the bladder 15 that is fixed to the container body 10 resists and reduces such effects to make it practical.

In this invention, as described above, since the bladder 15 is fixed to the container body 10 from almost one end to the other end including the center of the upper surface, even when the bladder 15 has a relatively large capacity, liquid When fluid flows into the bladder 15, the bladder 15 deforms almost in a predetermined direction, and the effects of local squeezing, local expansion/contraction, or twisting due to the weight of the liquid, inertia, etc. can be significantly reduced. It can withstand long-term use by preventing fatigue failure, and has the effect that the flow of liquid in and out is uniform and almost constant.

In another embodiment of the invention shown in FIGS. 4 to 6, the container body 10 has a circular cross section and extends horizontally, in which is arranged a bladder 15 which assumes a similar shape when inflated. , a plurality of mounting members 20 at the top of this bladder are fixed to a mounting frame 21 provided in a portion such as a manhole 25 which is formed to extend long at the top of the container body 10, and the portion corresponding to the above embodiment is as follows. They are represented by the same symbols.

In addition, in this invention, if the reinforcing band 18 is provided on the bladder 15, the deformation of this part will be reduced, and the direction of deformation of the bladder 15 due to the inflow and outflow of liquid can be more reliably controlled, and the strength of this part can be increased. There is, but this part of the bladder 15
The reinforcing band 18 may be made thicker, or the reinforcing band 18 may be omitted without making the wall thicker, or the reinforcing band 18 may be made of a metal plate to increase its strength. Of course, even if such various changes are made, the above effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of this invention.
Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a front view showing the bladder in a deflated state, Fig. 4 is a longitudinal sectional view showing another embodiment of this invention, and Fig. 5 is a sectional view showing the bladder in an inflated state. FIG. 6 is a front view showing the bladder in the open state, and FIG. 6 is a side view showing the upper half of the bladder. 10 is a container body, 15 is a bladder, 18 is a reinforcing band, 20 is a mounting member, and 21 is a mounting frame.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A container body having a rigid and airtight structure and having a hollow shape has a deformable bag-like bladder made of a flexible elastic material, and a gas is sealed between the container body and the bladder. 1. A pressure vessel in which liquid is introduced into and out of the vessel from the lower part, wherein the bladder is fixed to the vessel body from substantially one end to the other end including the center portion of the upper surface of the pressure vessel. 2. The pressure vessel according to claim 1 of the Utility Model Registration, wherein the bladder is joined with a reinforcing band that surrounds the bladder in an annular manner along the periphery of a portion that intersects with a plane that substantially bisects the bladder; A pressure vessel characterized in that the portion fixed to the main body is a portion along the upper surface of the reinforcing band.