JPS5842361B2 - Atsuriyokuyouki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the field of pressure vessels, particularly pressure vessels which are closed at one end and have a hole;
The other end relates to a pressure vessel of the type having a cylindrical vessel defining an open mouth.

The container has a deformable pouch of resilient material disposed therein, said pouch having a large mouth with a thickened rim portion, and a lower end of an annular metal support member embedded in said rim portion. The support member extends outwardly from the rim portion, the free end of the support member being secured to the rim portion of the mouth of the container closed with a suitable cover.

The thickened rim on the inside surface of the bladder allows an inwardly extending annular bead to be molded integrally with the lower edge of the support member in the plane below the rim so that the bladder can be formed without creating sharp pleats. Allows for folding.

It is noted that in the past, pressure accumulators typically include a cylindrical container having a closed end and the other end connected to a source of pressure fluid.

Typically, a large-mouthed bag of deformable elastic material is secured within the container by an annular support member secured to the interior wall of the container.

In the pressure accumulator disclosed in U.S. Pat. No. 2,932,321, the support member has an inwardly directed flange over which the mouth of the bladder is molded. A ring-shaped metal support member is embedded near the open end of the bag-like body.

The bag is slightly thickened in the area where the flange of the support member is embedded.

A bag-like body made of an elastic material disclosed in Japanese Patent Publication No. 47-33921 has its open end sandwiched between a container and a metal support member, and this bag-like body is attached to the flange of the support member, i.e. An annular bead is formed directly adjacent the lower end.

In operation of such conventional pressure accumulators, when pressurized fluid is introduced into the interior of the container, the bladder moves upwards and folds back, eg, on the inside.

In the case of the pressure accumulator described in U.S. Pat. The wall portion of the resulting and folded bag is in close contact with the rim.

If such sharp bends occur repeatedly in the wall portion of the bag, the bag will fail due to fatigue.

In the case of the pressure tank shown in Fig. 1 of Japanese Patent Publication No. 47-33921, the rim of the bag is held between the sleeve of the metal holding piece and the inner wall of the container, and the rim of the bag is fixed. A bead at the lower end of the rim contacts the lower end of the sleeve of the metal retaining piece.

Accordingly, since the folding of the bag occurs in the thin wall portion below the bead, repeated sharp bends, as in the pressure accumulator of the aforementioned US patent, will cause the bag to fail due to fatigue.

It is an object of the present invention to prevent the mouth of the bag from forming sharp folds when the bag is deformed during use, thereby preventing the formation of sharp folds and breakage of the bag. It is an object of the present invention to provide a pressure vessel of the type.

To achieve this objective, according to the invention, the annular bead formed on the inner surface of the rim portion of the bladder is below the lower edge of the metal support member embedded in the rim portion;
and is located above the thin wall portion of the pouch, the upper end of the bead merging with the inner wall of the rim portion through an annular concave curved surface at a substantially obtuse angle, and the lower end of the bead joining the inner wall of the rim portion through an annular concave curved surface. It merges with the inner wall of the thin wall portion of the pouch at a considerable obtuse angle via a concave curved surface.

According to this configuration of the invention, when the bag is folded back with the inside out, the folding occurs along concave curved surfaces adjacent to the upper and lower ends of the bead, and these concave curved surfaces are deformed to form a small radius. Although it forms an arcuate curved surface, there are no sharp folds.

Therefore, the stress generated in the bent portion is extremely small compared to the case of the prior art described above, resulting in the effect of extending the life even after repeated use.

These objects are achieved by the arrangement and combination of elements hereinafter described and (particularly pointed out in the claims).

The accompanying drawings illustrate one of various possible embodiments having several features of the invention.

Referring to the drawings, a pressure accumulator according to an embodiment of the present invention is shown in FIG. 1 and includes a vessel 10 made of a rigid material, such as steel, capable of withstanding relatively high pressures.

The container includes two complementary shells 11 and 12, the former including a lid or canopy member of the latter defining the body portion of the accumulator.

The edges 13, 14 of the shell are chamfered as shown to define a square-shaped annular groove when the rim is lined up next to its inner edge 15,16.

Each of the shells 11.12 has a rounded end 1γ.

18, the accumulator is a generally cylindrical device with generally hemispherical ends, each end having an axially aligned hole 19,21.

Hole 19 is adapted to receive a suitable gas valve (not shown) and hole 21 is adapted to receive a fitting 22.

As shown in FIG. 1, coupling 22 includes a cylindrical sleeve secured to bore 21 by welding.

A deformable partition in the form of a bladder 23 made of rubber or a similar material with similar properties is located within the container.

One end of the bladder closes at 24, and this closed end preferably has a rigid button or valve member 25 secured thereto or integrally molded therein, which valve member is axially aligned with the bladder and When the bag expands and closes the hole 21, the joint 2
The valve seat 26 is configured to move relative to the valve seat 26 defined by the inner end of the valve seat 26.

The opening 27 of the bag-like body 23 is connected to an annular support member 29 as shown in the figure.
It has a thickened rim portion 28 which is secured by being embedded therein.

The support member 29 is made of a relatively thin and resilient thin plate, such as a steel plate, and has an inwardly sloping mounting portion 31 at its lower end and an outwardly sloping retaining portion 32 at its upper end.

As shown in FIG. 1, the connection 33 between the retaining part 32 and the cylindrical central part 34 of the support member 29 rests on the inner edge 16 of the rim 14 of the shell 12, and the rim 13 of the shell 11 rests on the inner edge 16 of the rim 14 of the shell 11. Resting on the top surface of section 32, rim 13.14 and retaining section 32 are secured together at 35 by welding.

As clearly shown, the thickened rim 28 has a cylindrical row surface 36 terminating in a connection 37 slightly below the lower end 38 of the attachment portion 31 .

The outer surface 39 of the thick rim 28 between the connection 37 and the beginning 41 of the thin walled portion of the bladder 23 is a curved truncated cone as shown.

The upper part of the inner surface of the thick rim 28 slopes outwardly at 42, which slope terminates in an area 43 located in the plane of the lower end 38 of the attachment part 31.

An annular bead 45 is molded on and integrally with the thick rim 28 of the bag 23, the bead having a semicircular cross-section, extending from the beginning 41 of the thin wall portion of the bag 23 to the thick rim. 28 to the lower end 46 of the cylindrical inner wall surface 47 .

During use of the accumulator, the bladder is filled with pressurized gas and a fluid, such as pressurized oil, is forced through the fitting 22 to fill the accumulator.

This folds the pouch inward.

Due to the above arrangement, when such folding occurs,
The thin wall portion of the bladder folds inwardly around the bead 45.

Because of the size of the bead 45, the base of the fold is significantly curved so that no sharp folds occur that would cause the bag to fail.

Furthermore, due to the considerable stiffness due to the thick rim 28 of the bladder and the presence of the annular bead 45, a fold of a sufficiently small radius occurs at the lower end 38 of the attachment portion 31 to cause severing of the bladder. tendency is effectively eliminated.

[Brief explanation of the drawing]

FIG. 1 shows a longitudinal section through an accumulator according to the invention, and FIG. 2 shows an enlarged detail of the invention. In the figure, 10... Container, 23...
Bag-like body, 27... Mouth, 28... Thick rim, 29... Annular support member, 31...
・Mounting part, 45...bead.

Claims (1)

[Claims] 1 a container 10 of rigid material with one open end and a closed other end with an axial hole; a deformable pouch 23 located within said container and made of elastic material; has a mouth 27 with a thick rim portion 2B, the lower end of which has a closed thin wall portion extending from said thick rim portion; an annular metal support member 29 having a mounting portion 31 on the lower edge and an annular holding portion 32 on the upper edge fixed to the mouth of the container;
said mouth covering device 11; said thick rim portion 28 of said pouch having an annular bead 45 integrally molded on its inner surface, said annular bead being integrally formed with said lower part of said metal support member; Located below the edge and above the thin wall portion of the pouch, the upper end of the bead forms a substantial obtuse angle through an annular concave curvature to form the thick rim portion 2.
8, and the lower end of the bead is joined to the inner wall of the thin wall portion C of the bag-like body through an annular concave curved surface forming a considerable obtuse angle. .