JPS63232832A - Vacuum holding safety pressure governing member and manufacture thereof - 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 The present invention is a vacuum safety support for a pressure regulating member, comprising:
Said member is designed to rupture in one direction with a predetermined pressure difference in order to maintain a pressure vessel, and generally relates to a method of manufacturing a vacuum support of this type.

One known type of safety pressure regulator includes a rupture disk supported on a pair of supplementary support members or seven lunges that are in turn coupled to a vessel or device containing fluid pressure.

These devices are often used in environments with high temperatures, alternating pressures and vacuum conditions, and corrosive conditions. When this kind of disk is exposed to alternating internal and external pressures, the central part of the disk fluctuates in response to the pressure difference,
In this way, the disc is pushed to Z pressure, and the final design pressure of the disc is exceeded.The term "positive pressure" used here means a state in which the pressure inside the container is greater than the pressure on the other side of the safety pressure regulator. The term "reverse pressure" means a condition in which the inlet pressure is lower than the pressure on the opposite side of the pressure regulator.

To stabilize the latch 11 disk against fluctuations in response to changes in internal and external pressure differentials, a vacuum support is positioned within the rupture disk and interposed between it and the supplementary fusk. An example of this type of support is the US patent application LIS
-A-25230,68 and U.S. Patent Application U.S.
-A-2953279@.

In many applications, the vacuum support must be thick enough to support the rupture disk or seal in the presence of high back pressure. At the same time, the vacuum support must also be able to fully open upon the generation of the positive pressure that the rupture disk is designed to hear. When the rupture disk is designed to open at a relatively low positive internal pressure,
The vacuum support will be thick enough to prevent rupture of the disk or full opening of the device at a predetermined positive pressure, thus preventing or restricting flow.

Prior art vacuum supports typically include a plurality of petal-like members defined by radial cuts within the vacuum support. An ear is welded to the vacuum support adjacent to the cut to maintain the overall structure of the vacuum support in the presence of a reverse LE force, while a predetermined sufficient positive pressure is applied to the petal upon rupture of the rupture disk. open. In the past, it has been necessary to design vacuum supports that vary in thickness depending on the level of back pressure that the vacuum support must withstand.

In addition, ears spot welded to prior art vacuum supports constitute surface irregularities on which vessel material may accumulate. If this type of treatment is aerogenous, the useful life of the vacuum boat will be reduced, especially at high temperatures.

When the internal pressure within the vessel reaches the predetermined positive pressure heard by the rupture disc, the vacuum support is fully engaged and at the same time the part is held, so that no debris of the vacuum support is allowed to flow downstream of the safety pressure regulator. Not sent.

According to the present invention, the safety pressure regulating rupture member includes a beam, the convex side supporting the rupture member when the pressure on the concave side of the disc is lower than the pressure on the other side of the DJ recording member. at least one slit is formed in the disc, the at least one slit being positionable with respect to one side of the rupture member to cause the rupture member to phase by the rupture member when the pressure on the other side of the member is lower than the pressure on the other side of the member! (2) is defined by a pair of opposing substantially parallel edges, said disk edges providing a general support means for the mutually opposing parts when so pushed;

The present invention is simple and easy to construct, can open completely forward at low rupture disk pressures, while supporting the rupture disk in the presence of high back pressures, and can accommodate a wide range of back pressures and ruptures. A vacuum support is provided that can be used with pressure rated rupture disks and is fully audible in the forward direction without fragmentation when the internal vessel pressure exceeds the design rupture disk opening pressure.

According to another aspect of the invention, there is provided a method of manufacturing a vacuum support for use in a rupturable safety pressure regulator, the method comprising forming a convex portion of the disk, which substantially The slit is narrow enough compared to the thickness of the disk to sufficiently prevent the upper part from collapsing downward into the lower part in response to downward pressure applied to the upper part. It includes the process of

In order that the invention may be understood in more detail, it will be described below, by way of example only, with reference to the accompanying drawings, in which: FIG.

The apparatus 10 shown in FIG. 1 includes a base flange 12 screwed to a tube 14 that serves as a relief for a protective pressure vessel. Safety pressure regulator 16 is vacuum support 18
, sealing member 20. and a rupture disk 22 mounted together between the base flange 12 and the holddown flange 24. The hold-down flange is provided with coupling tube (not shown) means or threaded portion 26 for discharging fluid from the container portion to the outside when necessary. The seven flanges 12.24 are secured together by bolts 28, and the device 16 acts as a gasket between the flanges 12.24 to provide a sealing connection for the pressure vessel.

The rupture disk 22 has an upper convex side 30 (FIG. 2), a lower mouth side (not shown in FIG. 2), and a fixed flange 32.
(Figure 7). A plurality of slots 3 extend radially outward from a continuous center and a hole 38 is drilled or punched into the upper end of each slot to prevent stress concentration above one end of the thrower 1.

The Rapchadi furnace disk 22 is configured to rupture in the positive direction when the pressure within the tubular member 14 exceeds the pressure on the other side of the pressure regulator by a predetermined amount, the predetermined amount being a safe The pressure regulating device can be selected by varying the metal thickness considering the tensile strength of the metal and varying the length of the slot 34. For example, as the slots become longer, they will be closer to the central portion 3G of the rupture disk 22 and the area between the slots will become smaller to withstand the internal pressure of the container.

The sealing member 20 conforms to the shape of the rupture disk 22;
Alternatively, when assembled as part of a device, it must be sufficiently flexible to assume this type of shape. The function of the sealing member is simply to prevent leakage through the device 16;
and since its sole purpose is to prevent corrosion of the rupture disk 22, it may be made from a wide variety of materials, and the materials are used in each device with care taken to ensure that the rupture disk 22 is protected from corrosion. selected individually. The rough sealing member 20 and the rupture disc 22 may be combined into a single rupture disc that similarly seals against leakage.

As shown in more detail in Figures 4-6, the vacuum support 18
includes a circular disk 39 having a generally convex upper side 40 and a generally concave lower side 42, each of these surfaces being partially spherical. Virtually horizontal (as shown in Figure 5)
A slit 44 is formed through the vacuum support 18 and forms an arc centered around the central axis 46 of the disk 39. One end of the sulins 1-44 ends in the hole 45 to relieve stress concentration.

The slit 44 divides the disk 39 into an upper disk portion 48 and a lower disk portion 50.

A fixing flange 52 is formed around the radial outer circumference of the disk 39 and includes an outermost flat annular portion 54 which is similar to that shown in FIGS. The flanges 12 and 24 are tightened when fitted together as shown.

The slit 44 is defined by upper and lower disc edges 56 and 58, which are substantially parallel to the phase U as shown, each forming an angle of -1:60° with respect to the axis 46. The second shaft 60 is shown in FIG.
6 and parallel to the annular portion 54.

The third @62 is parallel to the f-isk edge 56.58. Thus, in a particular embodiment of the invention, the shaft 60.6
The angle between the two is actually 30°. In the safety pressure regulating device of the present invention, the disc edge 56,58 has an angle 64 in the range of O to
It has been found to be particularly successful when oriented at 45°.

A second slit 66 is formed through the disk 39, is symmetrical with respect to the slit 44, and includes a hole 68 at one end to relieve stress concentrations. Although not shown, the slit 66 includes upper and lower edges 56,58 that are parallel to each other and that are parallel to the axis 46.
effectively forming an angle of 60°.

Each slit 44.66 includes one end that reaches into the hole 45.68, as well as an opposite end 70.72. The portion of this disc between the holes 45.68 is shown here as the vacuum support hinge portion 69, and the portion between the ends 70.72 is shown here as the vacuum report locating portion 73.
The latter supports the upper portion 48 in line with the lower portion 50 when the vacuum support 18, sealing member 20, and rupture disk 22 are fitted together for the device as shown in FIGS. 1 and 7.

In operation, the vacuum length boat 18, seal 120 and rupture disk 22 are assembled between the flanges 12.24;
The pressure on the container to be protected is activated on the concave side of the sealing member 20 via the slit 44.46 and hole 45.68 in the vacuum support 18. When properly assembled, the sealing member 20 is pushed into the concave side of the rupture disk 22;
As a result, the pressure imparted to the sealing member 20 is exerted by the sealing member against the concave side of the rupture disk 22.

When the pressure within tubular member 14 exceeds the pressure on the convex side of rupture disc 22, vacuum support 18 effectively prevents rupture disc 22 and sealing member 20 from deflecting in response to pressure variations. In response to the pressure drop inside 14, the downward force is applied to vacuum support 18 by seal 20.
, and thus presses the upper edge 56 of the slit 44 against the edge 58, as well as jointly presses the E lower edge of the slit 66, so that the vacuum port is constructed as shown in FIG. Take. Thanks to the dome shape of the vacuum boat 18 and the mutual abutment of the slilamy edges, the vacuum support 18 is able to maintain the shape of FIG. 3 even in the presence of very high counterpressures. This is very uniform when the vacuum support is made from thinner materials than those used in the prior art.

The internal pressure of the tubular member 14, which is greater than the pressure on the other side of the safety device 16, acts on the sealing member 20 on the underside of the rupture disc 22. When this type of pressure reaches the rupture level of the gamma disk 22, the metal between the holes (such as holes 38 in the top of the disk 22) will separate except for one set of holes, as shown in FIG. In this way it is possible to release the disc. When the rupture disk 22 opens, pressure is applied to the sealing member 2
0 and allows the hinge of the vacuum support 18 to break through the material between the slit ends 70.degree. 72, thus allowing the hinge of the vacuum support to open as shown in FIG.

Vacuum length boat 18 can be designed to reliably withstand a selected value of adverse pressure differential without failure.

The strength of the vacuum support when exposed to counter pressure is axis 4
6 and the radial distance between the slits 44.66, the angle 64,
It is determined by the disc thickness and the width of the slit, ie the distance of the edge 56.58. The degree of reverse JF force that the vacuum support will support is a function of the thickness of the disk and the length of the hinge or distance between the holes 45.68.

The slit width will vary according to the thickness of the disc from which the vacuum support is made, and the distance between the edges will depend on the diameter of the rupture ice with which the vacuum support is used. It must be understood that it will vary according to the diameter of the disc.

In this way, the structure of the vacuum support of the present invention is such that the lower disk part 50 supports the upper disk part 48, as shown in FIG.
Due to the way the slit is milled, it can withstand high back pressure. The vacuum υ boat structure can be formed from a thinner material than the preceding vacuum support, so it can be fully audible in the positive direction at lower positive pressures.

Thus, unlike prior art vacuum supports, for a given radial disk size, the vacuum support of the present invention can be used with a wide range of positive and reverse pressure ratings for its combined radial disks. It is possible.

9 and 10 illustrate a second embodiment 75 of a vacuum support constructed in accordance with the present invention and including a pair of symmetrical slits, one of which is slit 7.
6 through a domed portion of the vacuum support similar to the vacuum support 18 .

Vacuum support 74 is a substantially flat radial circular flange 7 used to mount the vacuum support within the flange, the type of attachment being different from flange 12.24 in FIG.
Contains 8. Vacuum support 74, on the other hand, functions in the same manner as the embodiment of FIG. 1 (combining rupture ice and seals, each with a planar flange similar to seven flange 78). Other means described herein for attaching the 22 supports of the present invention may also be used.

Returning now to FIG. 6, a laser 80 is included here. When making the vacuum support 18, the laser 80 is used to form the slit 44.66, and the laser beam is directed toward the axis 62.
, thus forming the slit edges 56,58 at an angle that follows the orientation of the rape 80. Laser 80 is edge 56.58
With precision control for selecting both the angle of slit 44 and the width of slit 44, the vacuum boat can thus be precisely designed to withstand a predetermined amount of back pressure. Vacuum supports designed in this manner are similar to prior art vacuum supports which typically have ears spot welded adjacent to the cuts made through the disc 39 to withstand up to a predetermined amount of reverse juice forces. The edges of the slits are perpendicular to the adjacent surfaces of the dome, thus preventing the edges from tending to undercut each other during counter-pressure conditions.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional perspective view of a safety pressure regulator V4III incorporating a specific example of the vacuum support of the present invention, with a part of the support broken away; FIG. 2 is an exploded assembly view of the safety pressure regulator shown in FIG. 1; Figure 3 is an enlarged partial sectional view of a part of the safety pressure regulator in Figure 1, Figure 4 is a top view of the vacuum boat of the safety pressure regulator in Figure 1, and Figure 5 is 5 in Figure 4. -5 line, Figure 6 is an enlarged view of a part of Figure 5, Figure 7 is a cross-sectional view of the safety pressure regulator in Figure 1, Figure 8 is after the safety pressure regulator has ruptured. Figure 7, the same figure, and Figure 9 are vacuum boards 1 to 1 constructed according to the present invention.
FIG. 10 is an enlarged view of a portion of FIG. 9. 18......to vacuum ribbon 1, 22...
Labuchi V parts, 3...discs, 40...
...Convex side, 42...Concave side, 44.66.
...Arc-shaped slit, 56.58...Disc bar.

Claims (17)

[Claims] (1) A vacuum support for use with a safety pressure regulating rupture member, the vacuum support including a disk having a convex side and a concave side, the convex side being such that the pressure on the concave side of the disk is positionable with respect to one side of the rupture member for supporting the rupture member when the pressure is lower than the other side of the rupture member; at least one slit is formed in the disk;
bounded by a pair of opposing substantially parallel spaced disk edges and dividing said disk into portions, said edges being defined by said edges when said pressure on a concave side of said disk is lower than pressure on the other side of said rupture member. A vacuum support, characterized in that it is forced relative to each other by a rupture member and further provides overall support means for mutually opposing portions when said disc edge is so pushed. (2) A vacuum support according to claim 1, characterized in that the distance between the disk edges is smaller than the thickness of the disk. (3) the vacuum support includes first and second slits, a first pair of opposing ends between which the slits form a vacuum support hinge portion, and a second pair of opposing ends between which the vacuum support positioning portions are formed; Vacuum support according to claim 1 or 2, characterized in that it has an end. 4. The vacuum support of claim 3, wherein the vacuum support locating portion is substantially shorter than the vacuum support hinge portion. (5) Claims 1 to 4, characterized in that the at least one slit forms one arc.
Vacuum support according to any one of paragraphs. (6) Vacuum support according to claim 5, characterized in that the first and second slits together form an arc greater than 270°. 7. Vacuum support according to claim 5 or 6, characterized in that the convex side, the concave side and the one or more arcs are centered on a common axis. (8) Vacuum support according to claim 7, characterized in that the disc edge forms an angle between 45° and 90° with the axis. (9) Vacuum support according to claim 8, characterized in that said angle is substantially 60°. (10) The concave and convex sides of the disk are partially spherical, and the disk edge is formed on a plane passing through the center of curvature of the spherical surface, so that the disk edge is perpendicular to the adjacent portions of the concave and convex sides. Claim 8, characterized in
Vacuum support according to paragraph or paragraph 9. (11) the at least one slit is horizontal;
11. Vacuum support according to any one of claims 1 to 10, characterized in that it forms upper and lower disc parts. (12) A method of manufacturing a vacuum support for use in a rupturable safety pressure regulator, the method comprising: forming a disk having a convex upper surface and a concave lower surface; formed through the disk, which generally divides the disk into an upper and a lower portion, the slit being sufficient to prevent the upper portion from collapsing downwardly onto the lower portion in response to downward pressure applied to the upper portion. A method characterized by including the step of narrowing compared to thickness. (13) The method according to claim 12, wherein the step of forming the slit is performed by cutting with a laser beam. (14) A method according to claim 12 or 13, characterized in that the slit is cut narrower than the thickness of the disk. (15) A method according to any one of claims 12, 13, or 14, characterized in that the slit is cut as an arc. (16) Any of claims 12, 13, 14, or 15, wherein the slit is cut at either end of the slit by a pair of opposing substantially parallel disk edges. or the method described in paragraph 1. (17) A method according to claim 16, characterized in that the at least one slit is cut to form an edge at an angle between 45° and 90° with respect to the longitudinal axis of the disk. .