JP2000329331A - Flame-shielding body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame-shielding body that can be easily manufactured and assembled, has the extremely slight penetration of a combustible gas although mechanical strength is large, and securely shields the penetration of flame. SOLUTION: A number of straight and separate thin plate stripes 6 and 6' that are positioned up and down each other are flatly provided in parallel with a plane including the axis of a penetration opening. The thin plate stripes 6 and 6' are retained at specific mutual intervals simply by an overhang bend part 8 of at least every other thin plate stripe 6' itself. The space between the thin plate stripes 6 and 6' does not have other structure parts at least in the range of the penetration opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a flame shut-off for gas flow openings, in particular as a pipe safety element and an explosion-proof element, and for the safety of the end of a container, which is arranged at a certain distance from each other. In the form of a generally flat sheet strip arranged in a continuous manner.

[0002]

2. Description of the Prior Art For piecewise pipe safety, for the end security of containers in both directions and for explosion protection, a flame barrier is provided, which is wound in a spiral. , Consisting of two lamellas which flow through in the axial direction of the helix, one of which is corrugated or
Alternatively, it is chamfered in a trapezoidal shape continuously obliquely in the flow-through direction. In order to prevent two points deformed in the same direction from being placed one on top of the other during a spiral winding, the second sheet is made flat, for example as described in US 5,415,233 A. This ensures a uniform gap width. This, however, results in a reduction of the heat exchange surface, which is disadvantageous for the flame blocking action,
The axial stability of the helix must also be provided by additional structural parts which increase the cross section. Furthermore, the spiral wound core gives rise to a significant resistance to gas flow, which is located exactly at the center of the through-flow opening with the highest flow velocity. E with the same structure in principle
In the flame shield of P 0 375 455, the flow resistance in normal operation is even further increased by an additional cup-shaped structure. Connecting the above two or more flame shutoffs back and forth to increase the degree of safety multiplies the disadvantages of the above flame shutoffs.

[0003] DE-PS 241 925 discloses a sieve insert for the filling and discharging openings of containers, in which the screw is wound and can be passed in parallel by a liquid. There is one sheet strip, the windings of which are held apart by projections for a precisely defined gap width.
However, this variant is not suitable for continuous flat flow through combustible gases, as is the case in the case of the above-mentioned flame shut-offs in the pipe conduit and in the container to be secured. Cylindrical perforated sheets, which ensure the stability of the sheet strip, additionally increase the flow resistance in a disadvantageous manner.

In EP 0 568 326 A1, one of the flame-blockers
As an example, a pile of flat sheets arranged one above the other is described, the individual sheets being held at a predetermined distance from one another by a wound band or by other spacers. This implies a material cost that exceeds the material cost for quenching, again with a large surface loss for heat exchange between the gas and the flame shut-off and a relatively high flow resistance and a relatively high flow resistance for the gas in normal operation. High production costs due to the large number of parts to be assembled.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to provide a flame shield of the type mentioned at the beginning, in that it is simple to manufacture, easy to assemble and has high mechanical strength. Nevertheless, the configuration is such that the penetration of flammable gas is very slight and the gap is reliably defined to ensure a reliable cut-off of the flame penetration.

[0006]

According to the present invention, this object is attained as follows. That is, a number of straight, separate laminations lying one above the other are provided in a flat form and parallel to the plane containing the axis of the through-flow opening, these laminations being merely at least By means of only the overhanging bends of every other sheet strip itself, a predetermined mutual spacing equal to the gap width determined for the respective gas is maintained, the space between the sheet strips being: At least in the region of the flow-through opening, no further structural parts are provided.

[0007]

The flat strips have a very high mechanical strength, in particular in the direction of the gas flow, in other words in the direction parallel to the strips lying parallel to the axis of the flow-through opening. Despite its strength, it is significantly easier to manufacture and assemble than a wound or screw-shaped construction of the flame shield, in the case of the present invention a spaced overhang curve. This avoids other structural parts which increase the production and assembly costs.
In other words, two groups of sheet strips can be used in time, in which case the projecting curve of the sheet strip with the projecting curve is always located on the same side,
It is laid up and down alternately with a generally flat sheet metal strip. Apart from the strips provided for heat absorption and thus for quenching, no other structural parts are in the gas flow path, so that the flow of the flame shut-off during normal operation is as small as possible. Can only be disturbed. In this regard, it is also helpful that additional structural parts which provide any support or holding based on the mechanical stability of the sheet strip need not be mounted in the flow path. Furthermore, the sheet strips, including the sheet strips with overhangs, can be made very simply and easily to any width required for reliable quenching, and therefore meet any requirements. Even
A sufficient quenching action can be achieved with only one sheet bundle. This eliminates the drawbacks of the known spiral-wound wheel-shaped flame shut-offs, which consist of a fully corrugated or trapezoidally chamfered sheet strip with a stabilizing core. When these known flame shut-offs are connected back and forth, they also require a large spacing based on additional structural parts for providing mechanical strength, and based on this spacing individual flame shut-offs are required. The gas between the bodies is ignited again due to the inadequate quenching effect of the flame shutoff connected ahead, and the propagation ignition of the gas is not prevented. This danger has to be dealt with in the prior art by additionally arranging additional flame shut-offs, which significantly increases the costs, the construction size and also the flow resistance in an unfavorable manner.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Of course, it is possible to mount and fix an overhang of another material, if necessary, on a completely flat sheet metal strip, but this is simple and economical to manufacture. In this case, the overhang is constituted by an overhang, preferably embossed, of a sheet metal strip.

In another embodiment, for a bundle of sheet strips, only the sheet strips having a bulging curve are provided directly above and below, and are directly above and below. The overhanging curvatures of the strips are offset from one another. Thereby, in order to maintain the quenching action and the maximum gap width for each gas to reduce the flow resistance,
Only one sheet strip is required, which greatly simplifies the manufacture and storage of the flame shield.

In order to maintain good spacing between the strips, to increase the mechanical strength without compromising the flow-through potential, and to make it easier to handle the bundles of the strips lying one above the other. In another embodiment of the invention, the longitudinal ends of the sheet strip are fixedly held at a defined mutual distance outside the through-flow opening.

[0011] Advantageously, the longitudinal ends of the sheet strip are cast in metal or plastic so that the longitudinal ends of the sheet strip can be connected simply, quickly and sufficiently durably. , Welded or brazed.

Another object of the invention is to achieve a good flame-blocking effect, advantageously by using structural elements of the same possible, small structural size, thereby simplifying the production. In a further embodiment, several separate bundles of sheet metal strips are arranged one behind the other, preferably directly adjacent to one another and preferably in the same housing.
According to the invention, the mechanical stabilizing structure of the known flame barrier consisting of a helically wound sheet strip is, according to the invention, a large internal part of the sheet strip bundle parallel to the plane of the sheet strip. Since it is not necessary due to the strength, the sheet strip bundle according to the invention, in other words the original flame barrier, can be arranged directly one behind the other, so that there is no space as far away as possible, and the gas is ignited again. It will not be done.

It is advantageous to facilitate replacement after damage of the flame shut-off in the event of an abnormality, and also during periodic inspections in order to maintain a flow-through possibility which is as unimpeded as possible. , Each bundle is framed outside the through-flow opening,
Packed in cartridges that can be handled separately.

In the embodiment which is simplest to fabricate, by being able to use parts of similar and same dimensions, the bundle of sheet metal strips has a square, preferably square, cross section. ing.

In order to achieve a good ratio of flow-through surface to material consumption, the bundle of sheet metal strips has an annular, preferably circular, cross section.

In another embodiment of the present invention, at least one
At least one side of the bundle is provided with at least one further flow-through wall for changing the flow properties of the gas, this flow-through wall being constituted, for example, by a perforated sheet or a wire braid, or Advantageously it is made from expanded metal. On the one hand, this through-wall equalizes the flow and shape of the resulting flame front, so that there are no sharp points in the narrowly defined area, distribution over a large area, and therefore the heat reception of the flame shut-off Make good use of capacity and avoid local overload. This also increases the transit time of the flame front through the flame blocker. This ensures that any passage of flame through the flame shield according to the invention is prevented. On the other hand, this cross-flow wall increases the mechanical strength, so that it can withstand repeated explosions without deforming in a way that impairs its function, while the flame barrier is fully functional And remain in a usable state. In this case, in an embodiment which is particularly simple in construction and is very inexpensive, the through-flow wall is configured as a perforated sheet or a wire braid. On the other hand, the expanded metal can control the flow state, wherein the rhombic shape and position of the expanded metal and the orientation of the web can be selected according to the desired control. Due to the uniform vortex, the cooling capacity of the flame grid can be optimally utilized without excessively increasing the flow resistance.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be specifically described below based on embodiments shown in the drawings.

The insertable housing 1 is provided in the pipe line for the gas, for example between the two flanges, with a through-flow opening 2 in each of its faces located transverse to the axis of the pipe line. These through-flow openings advantageously correspond to the tube cross section. The screw holes 3 are provided for connecting screws. The actual flame shut-off is provided as a separate cartridge 4 which can be treated as a block, a seal-closable lateral opening 5 oriented transversely to the tube conduit.
Through the casing 1. In this case, the generally flat lamellas 6, 6 'of the cartridge 4 are located in the region of the flow-through opening 2, the lamellas being precisely oriented in the direction of gas flow and having minimal flow. Only resistance can occur.

As shown in an exploded perspective view in FIG. 2, the generally flat individual lamella strip 6,
6 'are arranged at a precisely defined mutual spacing, which corresponds to the gap width specified by the specifications for the respective gas. Surrounding the bundle of sheet strips 6 is a frame 7 which guarantees the mechanical stability and the connection of the bundles of sheet metal 6, in other words that they can be handled together.

The predetermined distance between the strips 6, 6 'without excessive material consumption and without significant surface losses for the heat exchange between the gas required for the quenching and the strips 6, 6'. At least every other sheet strip 6 'is provided with projections, which are formed, for example, by rounded peaks or overhangs 8 impressed on the sheet strip 6'. be able to. These preferably crown-shaped overhangs 8 are preferably arranged in groups,
It can be constructed by projecting and curving both sides of the thin plate strip 6 '. On the other hand, an embodiment is also conceivable in which only the thin strips 6 ′ with the overhangs 8 are positioned one above the other. In this case, the overhanging curvatures of the adjacent strips 6 'are offset from one another, so that a local reduction of the spacing due to overlapping of the recesses is avoided. In this way, it is also possible to ensure a space of any size between all the strips 6 ′ with the overhang 8. Regardless of the construction, the sheet strip is easily and inexpensively manufactured in any length (for any size of the flame blocker) and in any width (for reliable flame-extinguishing action) In this way, it is possible to ensure sufficient anti-extinguishing action in all applications already with one sheet bundle and thus with minimum dimensions.

As shown in FIG. 4, when the sheet strips 6, 6 'are grouped into a round shape corresponding to the normally round through-flow opening 2, a very compact and small-sized flame shield can be obtained. This can be done, for example, by first assembling the strips 6, 6 'of the same length into a bundle and then shaping them into the desired shape. In this case, it is particularly advantageous if the ends of the strips 6, 6 ′ are fixed at the desired spacing by casting in metal or plastic 9. This can, of course, be performed on cartridges 4 of any shape. The inner edge of this metal or plastic frame preferably coincides with the edge of the through-flow opening 2 of the casing and is usually the one of the cartridge 4 (which is omitted in FIG. 4 for clarity). It is covered by the frame 7. Of course, also in FIG. 4, the thin plate strip 6 'having the overhanging bending portion 8 is provided, but the overhanging bending portion is not shown in FIG.

Of course, a plurality of cartridges 4 are pressed into the casing 1 directly adjacent to one another so that there is no intermediate space in which the gas can be ignited again, and are individually replaced, for example for cleaning. You can also get it. Instead of the overhang 8, it is also possible to provide another projection, for example a material, in particular a metal dot, which is additionally mounted on a flat sheet metal strip.

[Brief description of the drawings]

FIG. 1 is a perspective view of a flame shut-off body having a casing.

FIG. 2 is an exploded perspective view of the flame shut-off body of FIG.

FIG. 3 is an enlarged plan view and an enlarged side view of a thin plate strip provided with an overhanging curved portion of the flame shut-off body according to the present invention.

FIG. 4 is a view showing another embodiment of the flame shut-off body according to the present invention.

[Explanation of symbols]

1 casing, 2 through-opening, 3 screw hole, 4
Cartridge, 5 opening, 6 thin strip, 6 '
8 sheet, 7 frame, 8 overhang, 9 metal or plastic, 10 through wall

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Johannes Bessau Austria, Vienna Ainsey-Dragasse 8/7 (72) Inventor Robert Graf, Austria Vienna Wolfgang Ggasse 42-46 / 2/9

Claims (10)

[Claims] 1. Flame barriers for gas flow openings, in particular as pipe safety elements and explosion protection elements, and for terminal safety of containers, which are generally spaced apart from one another. In the form of flat lamellas, a number of straight lamellas (6, 6 ') lying one on top of the other are arranged in a flat form and extend through the axis of the through-flow opening (2). Are provided parallel to the plane in which they are contained, and these sheet strips (6, 6 ') are merely provided by at least every other sheet strip (6') by an overhanging curvature (8) of itself. It is kept at a predetermined mutual interval equal to the gap width determined for each gas,
Flame barrier, characterized in that the spaces between the strips (6, 6 ') have no further structural parts, at least in the region of the through-flow opening (2). 2. The overhanging curved portion comprises a thin plate strip (6 ').
2. The flame shut-off according to claim 1, characterized in that it is constituted by a preferably embossed overhang (8). 3. The overhanging of the thin strips which are provided directly above and below only the thin strips (6 ') with the overhang curves (8). 3. The flame shut-off according to claim 1, wherein the parts are offset from one another. 4. The device according to claim 1, wherein the longitudinal ends of the sheet metal strips (6, 6 ') are fixed outside the through-flow openings (2) and are fixed at a defined distance from one another. Item 4. The flame blocker according to any one of Items 1 to 3. 5. The longitudinal end of the sheet metal strip (6, 6 ') is cast, welded or brazed in metal or plastic (9). The flame shut-off body according to claim 4. 6. A plurality of separate bundles of sheet metal strips (6, 6 ') are arranged one behind the other, preferably directly adjacent to one another and preferably in the same housing (1). The flame shut-off body according to any one of claims 1 to 5, wherein the flame shut-off body is arranged. 7. A cartridge (4) which is provided with a plurality of separate bundles of sheet metal strips (6, 6 '), each bundle being outside the through-flow opening by a frame (7). ).
7. The flame-blocking body according to any one of items 1 to 6. 8. A plurality of separate bundles of sheet metal strips (6, 6 ') are provided, each bundle being square, preferably square,
8. The method as claimed in claim 1, wherein it has a cross section.
The flame shut-off body according to any one of the above. 9. A plurality of separate bundles of sheet metal strips (6, 6 ') are provided, each bundle having an annular, preferably circular, cross section. The flame-blocking body according to any one of claims 1 to 7. 10. A plurality of separate bundles of sheet strips (6, 6 ') are provided, on at least one side of at least one bundle, at least one other for changing the gas flow properties. Characterized in that it is provided, for example, by a perforated sheet or a wire braid, or preferably by an expanded metal. Item 10. The flame blocker according to any one of Items 1 to 9.