WO2005108836A1

WO2005108836A1 - Pressure relief device comprising a rupture disk

Info

Publication number: WO2005108836A1
Application number: PCT/DE2005/000772
Authority: WO
Inventors: Karsten Laskowski; Manfred Meinherz
Original assignee: Siemens Aktiengesellschaft
Priority date: 2004-05-07
Filing date: 2005-04-22
Publication date: 2005-11-17
Also published as: DE102004023783A1; EP1743111A1; CN101052835A

Abstract

The invention relates to a pressure relief device (1,20) for a housing that can be subjected to pressure, said device comprising a rupture disk (3,23). Said rupture disk (3, 23) is surrounded by a frame (2,21) which is embodied as a single component and projects past a bulging of the rupture disk (3,23) protruding from the surface thereof. The rupture disk (3,23) is at least partially covered with a filler (10), and a device (26,27) for protection against accidental contact is arranged on the frame (2,21).

Description

description

Overpressure protection device with a rupture plate

The invention relates to an overpressure protection device with a rupture plate for a pressurizable housing, a frame which is connected to the rupture plate in a gas-tight manner projecting beyond the rupture surfaces of the rupture plate (3, 23).

Such a device is for example from the catalog 77-8006 from BS&B SAFETY SYSTEMS, INC. Section C-8 VAC-SAF system, page 10 known. In the known overpressure protection device, a bursting plate is formed from a metallic disk. The rupture plate is provided with a frame. The frame is made up of several parts. The rupture plate is clamped between two parts of the frame. The frame parts are held together by external bracing elements, so that the bursting plate is held in the frame.

Depending on the design of the housing, various bursting plates are used, which have different technical parameters, so that optimal protection of the housing is guaranteed. The rupture plates are removable from the frame and interchangeable. Likewise, after a bursting plate has responded, the destroyed bursting plate is replaced by a new bursting plate. The bursting plates are precision products that burst at a predefined limit.

Handling the bursting plates must always be carried out with increased caution, as external mechanical influences can very easily impair the bursting behavior. So false tripping or failure to trigger on previously damaged rupture plates can occur. Even minor external influences that do not leave any traces on the rupture plate itself can lead to such impairments. Furthermore, the rupture discs must always be inserted into the two-part frame in such a way that tilting or overloading of individual sections of the rupture plate is prevented. Even careful handling can result in undetected damage to the rupture plate.

The invention is based on the object of designing an overpressure safety device of the type mentioned at the outset in such a way that improved protection of the rupture plate from external mechanical influences is ensured.

In an overpressure protection device of the type mentioned at the outset, the object is achieved in that the frame is in one piece.

Compared to a frame consisting of several parts, which can be separated, a one-piece frame offers the advantage that the number of parts of the overpressure protection device is reduced. Due to the fact that the rupture surfaces protrude through the frame, the rupture plate lies within a protected space, so that protection against unintentionally acting forces is provided when the rupture plate is put down during assembly. Due to the one-piece design of the frame, the bursting plate is surrounded on all sides by the frame. When installing, the frame results in a continuous enclosure of the bursting plate that has no gaps.

This makes the frame mechanically strong. For example, it can be designed as a flange connection and flanged directly to other assemblies. The burst plate is attached to the frame regardless of the tightening torque of the flange. The bracing forces are guided over the one-piece frame. It can also be provided that the frame is assembled from several sections and acts as a one-piece frame by means of suitable joining methods, such as welding, gluing or screwing, so that the rupture plate is held in the frame free of clamping forces.

Advantageously, it can further be provided that the frame is connected to the bursting plate independently of an installation of the overpressure protection device.

By connecting the frame and the rupture plate regardless of the installation of the overpressure protection device, the frame stabilizes the sensitive rupture plate during transport. The frame prevents twisting or kinking of the rupture plate, for example. The increased stability gained also makes it easier to handle the overpressure safety device during transport or assembly. This saves assembly time.

A further advantageous embodiment can provide that the frame is molded onto the rupture plate.

The molding of a frame on the rupture plate enables a particularly simple sealing of the rupture plate on the frame. For example, it can be provided that the frame is integrally formed on the rupture plate by means of a fluid connection. Such a material connection can be a welded connection, for example. Furthermore, it can also be provided that during the manufacture of the bursting plate For example, the material thickness is increased at the edge of the rupture plate by punching and a frame is formed. Another advantageous embodiment can provide that the edge of the rupture plate is formed as a frame by folding or profiling.

It can advantageously be provided that the bursting plate is at least partially covered with a filling compound arranged within the frame.

Covering the frame with a filling compound effectively prevents external forces from acting directly on the rupture plate. The frame can serve as a limitation, so that a filling compound, for example in the liquid state, can easily be applied to the rupture plate and is distributed on all sides, the frame preventing the filling compound from flowing off. After curing, a protective layer is available that protects the bursting plate.

Furthermore, it can advantageously be provided that the filling compound has at least one filling body.

One or more packing elements can be introduced into the filling compound. This is particularly advantageous when a high density filler is involved. By introducing fillers with a lower density, the mass of the cover is reduced. Furthermore, if the rupture plate ruptures and the associated ejection of at least parts of the cover, a hazard is unlikely due to the small mass of the packing.

The use of fillers also allows the filling compound to be torn open during a bursting process. So certain segments can preferably be torn out of the filling compound or predetermined breaking points can be generated within the filling compound. With a corresponding coordination of the bursting plate and the filling mass in addition to the packing elements that may be present, the response behavior of the bursting plate can be set even more precisely.

It can advantageously be provided that the frame is filled with the filling compound and the bursting plate is covered on both sides.

Covering the bursting plate on both sides by means of a filling compound already allows very easy handling with the overpressure protection device during assembly. Through the complete sheathing of the rupture plate

Shocks dampened by the filling compound. It can be advantageous if the filling compound is elastic.

A further advantageous embodiment can provide that a contact protection device is arranged on the frame, which spans the bursting plate.

A contact protection device can be, for example, a plate provided with openings or a grid which is arranged over the surface of the bursting plate. The contact protection device prevents the rupture plate from being touched from the outside.

Furthermore, it can advantageously be provided that the contact protection device is arranged within the outer contour of the frame. An arrangement within the outer contour of the frame makes it possible to design the touch protection device to be delicate, since the mechanical stability of the frame can be used.

Advantageously, it can further be provided that contact protection devices are arranged on sides of the bursting plate facing away from one another.

An arrangement of the contact protection device on sides of the bursting plate facing away from one another guarantees all-round protection of the bursting plate against external influences. The shock protection device also prevents larger impacts from the rupture plate.

It can also be advantageously provided that the frame is an annular flange.

The design of an annular flange allows the overpressure protection device to be easily flanged onto existing flanges of a housing, for example. For this purpose, the frame advantageously has flange surfaces on the surfaces lying essentially parallel to the rupture plate, which can be flange-mounted, for example, on a housing flange. For this purpose, it can be provided that openings are arranged in the frame through which bolts can be passed for fastening the overpressure protection device. Additional pressure plates, flanges or the like are therefore not necessary. The overpressure safety device is flange-mounted free of force effects on the bursting plate. Furthermore, it can advantageously be provided that the frame has a circumferential projection on its inner lateral surface, to which the bursting plate is attached.

In particular when the frame is designed in a ring shape, it is advantageous to provide a projection on its inner lateral surface, to which the rupture disk is attached. This projection can be used advantageously to create a gas-tight seal between the frame and the rupture plate. This can be done in a variety of designs. For example, the bursting plate can be attached to the projection by means of a material connection method, for example a welding method. Alternatively, it can also be provided that a sealing is carried out using conventional sealing plugs and sealing elements.

It can advantageously be provided that the projection is at least partially formed by a groove arranged in the inner lateral surface.

In terms of manufacturing technology, a groove can easily be made in the frame. For example, the frame can be produced by a casting process or by a machining process.

A further advantageous embodiment can provide that at least one curvature protrudes from at least one of the bursting surfaces of the bursting plate and is protruded by the frame.

By providing a curvature in the surface, for example a dome-like elevation, the response behavior of the rupture plate can be adjusted more easily. The rupture surfaces can tear open more easily and the hurling of hidden rupture plate material is minimized. It is advantageous if the frame both protrudes beyond the curvature and protrudes beyond the side of the rupture plate, which is located on the side facing away from the curvature. Corresponding reinforcement of the frame means that bulges can also lie entirely within the outer contour of the frame. The configuration of the curvature can also be extended, for example, to curvatures that are deflected on both sides, so that, for example, a rupture plate has a wavy structure.

In the following, the invention is shown schematically on the basis of an exemplary embodiment in a drawing and is described in more detail below.

The shows

1 shows a section through a first overpressure protection device, the

Figure 2 shows a section through the first overpressure protection device with a filling compound

3 shows a section through a second overpressure protection device and the

Figure 4 is a plan view of a touch protection device.

FIG. 1 shows a section through a first overpressure protection device 1. The first overpressure protection device 1 has an annular frame 2. The annular frame 2 surrounds a rupture plate 3. The annular frame 2 is designed as an annular flange and has passage openings 4a, 4b through which bolts can be passed. The first overpressure protection device 1 can be fastened to a flange of a pressurizable housing by means of the bolts. The ring-shaped frame 2 can be sealed to the housing, for example, by a flange surface 5 arranged on the ring-shaped frame 2. Alternatively, it can also be provided that a groove is made in the flange surface, in which a sealing element 6, for example a rubber ring, is inserted. The section shown in FIG. 1 runs through the axis of rotation 7 of the annular frame 2.

The rupture plate 3 has a curvature. The curvature is designed such that it lies within the outer contour of the annular frame 2. The bursting plate 3 is protruded on the side of the curvature by a flange surface of the frame 2. Furthermore, the side of the bursting plate 3 facing away from the curvature is also overhanged by a flange surface of the opposite side of the frame 2. This is the

Bursting plate 3 both radially surrounded by the frame 2 and axially surmounted by the frame 2 with respect to the axis of rotation 7. It can also be provided that essentially flat rupture plates or rupture plates with multiple curvatures / formations, which optionally also extend on both sides of the rupture surfaces, are used. Regardless of the shape of the rupture plate used, the frame is designed so that it rises above the rupture plate and thus protects it from knocks.

In addition to the curvature of the bursting plate 3 shown in FIG. 1, further configurations of a curvature on the bursting plate 3 can also be provided. For example, it can also be provided be that curvatures are formed in several directions of the flat expansion of the bursting plate 3. In this case too, it is provided that, regardless of the alignment of the curvature, the frame 2 is designed in such a way that the bursting plate 3 lies completely radially and axially within the contour of the frame.

The annular frame 2 has a circumferential groove 8 on its inner lateral surface. A projection 9 is formed by the circumferential groove 8. The bursting plate 3 is connected to the frame 2 in a gas-tight manner on the projection 9. This connection is advantageously carried out with the aid of a material-locking method, for example by welding the bursting plate 3 into the frame 2. This creates a connection between the bursting plate 3 and the frame 2 which is free from the

Tightening torques when flanging onto a pressurizable housing. The gas-tight connection of the overpressure protection device 1 to a pressurizable housing and the connection of the bert plate 3 to the frame 2 take place independently of one another.

If the bursting plate responds due to a fault within the pressurizable housing, the bursting plate 3 is destroyed. After the response, the bursting plate 3 together with the associated frame is replaced and replaced by a structurally identical bursting plate 3 with a frame 2. The exchange of the bursting plate 3 and frame 2 ensures that a warping or tensioning of the bursting plate 3 is almost impossible during assembly. The frame 2 protects the bursting plate 3 from external mechanical influences.

FIG. 2 shows a further design option for the first overpressure protection device 1 Bursting plate 3 covered with a filling compound 10. The filling compound 10 is, for example, a silicone or an elastic organic polymer. Filling elements 11 are embedded in the filling compound 10. The fillers 11 consist of a material of low density, for example styrofoam, and are ring-shaped or sector-shaped. The filling body 11 can be used to initiate tearing open of the filling compound 10 at certain points when the bursting plate 3 responds. It can be provided that the bursting plate 3 is completely covered by the filling compound or by the filling compound and the filling elements 11. However, it can also be provided that the bursting plate is covered only in sections (section A). Furthermore, the bursting plate 3 can also be completely surrounded by a filling compound 10 within the frame 2. Because of the groove 8, it is also possible to use prefabricated moldings which can be easily fixed in the groove 8. This prevents it from falling out of the frame 2.

FIG. 3 shows a second overpressure protection device 20. In principle, the second overpressure protection device 20 has the same structure as the first overpressure protection device 1 shown in FIGS. This creates the possibility of additional grooves 24,

25 to bring, between which the rupture plate 23 is arranged. A first contact protection device 26 and a second contact protection device 27 can be inserted into the additional grooves 24, 25. It can also be provided that only one of the two contact protection devices 26, 27 is used. In addition, it can also be provided that the bursting plate 23 - as described for FIG. 2 - is at least partially covered with a filling compound. The Touch protection devices 26, 27 can be designed in different ways. For example, grids or plates can be inserted into the additional grooves 24, 25. The first contact protection device 26 is shown as an example in FIG. The first contact protection device 26 has a disk-shaped structure. The first contact protection device 26 also has a central recess 28. An annular disk is formed by the recess 28. A radially extending slot 29 is made in the annular disk. This creates one

Disc that is elastically deformable. The radial slot 29 can be pressed together by means of a tool which can be inserted, for example, in recesses 30, 31 which are arranged in the vicinity of the slot 29. As a result, the circumference of the first contact protection device 26 is changed and the disk can be inserted into the additional groove 24. After the relaxation of the first contact protection device 26, the edge area springs into the additional groove 24 and the first contact protection device 26 is secured in the additional groove. In addition to protection against external influences on the bursting plate 23, parts of the bursting plate 23 are prevented from being thrown out by the contact protection device when the bursting plate 23 bursts. This protects the environment from damage caused by flying rupture plate parts.

Claims

claims

1. Overpressure protection device (1.20) with a bursting plate (3.23) for a pressurizable housing, a frame (2.21), which is connected gas-tight to the bursting plate (3.23), the bursting surfaces of the bursting plate (3, 23) protrudes, characterized in that the frame (2,21) is in one piece.

2. Overpressure safety device (1.20) according to claim 1, so that the frame (2,21) is connected to the bursting plate (3,23) independently of an installation of the overpressure safety device (1,20).

3. Overpressure protection device (1) according to claim 1 or 2, so that the frame (2,21) is integrally formed on the bursting plate (3,23).

4. Overpressure protection device (1.20) according to one of claims 1 to 3, that the bursting plate (3,23) is at least partially covered with a filling compound arranged within the frame (2,21).

5. Overpressure protection device (1, 20) according to claim 4, d a d u r c h g e k e n n z e i c h n e t that the filling compound has at least one filling body (11).

6. Overpressure protection device (1.20) according to claim 4 or 5, characterized in that the frame (2,21) is filled with the filling compound and the Bursting plate (3.23) is covered on both sides.

7. Overpressure protection device (1, 20) according to one of claims 1 to 6, that a contact protection device (26, 27) is arranged on the frame, which spans the bursting plate (3, 23).

8. Overpressure protection device (1, 20) according to claim 7, so that the contact protection device (26, 27) is arranged within the outer contour of the frame (2, 21).

9. Overpressure protection device (1, 20) according to claim 7 or 8, so that contact protection devices (26, 27) are arranged on sides of the bursting plate (3, 23) facing away from one another.

10. Overpressure protection device (1.20) according to one of claims 1 to 9, that the frame (2, 21) is an annular flange.

11. Overpressure protection device (1, 20) according to one of claims 1 to 10, so that the frame (2, 21) has a circumferential projection on its inner circumferential surface, to which the rupture plate (3, 23) is fastened.

12. Overpressure protection device (1.20) according to claim 11, characterized in that the projection is at least partially formed by a groove (8) arranged in the inner lateral surface.

13. Overpressure protection device (1, 20) according to one of claims 1 to 12, so that at least one curvature protrudes from at least one of the bursting surfaces of the bursting plate (3, 23), which is surmounted by the frame (2, 21).