CN215818858U - Pressure reducing device - Google Patents

Abstract

The utility model relates to a pressure relief device comprising a pressure relief opening formed in a wall of a housing and a pressure relief flap (100) closing the pressure relief opening. The pressure relief flap (100) comprises a metal plate (110) having an inner face (111) and an opposite outer face (112), a sealing member (120) having an inner face (121) and an opposite outer face (122), wherein the outer face (122) of the sealing member (120) is fixed to the inner face of the metal plate and the inner face of the sealing member is locatable on a horizontal plane provided in connection with the pressure relief opening. The overpressure arising in the interior of the housing moves the metal sheet away from the housing and ultimately leads to a tearing of the seal, wherein the overpressure can escape from the housing through the relief opening.

Description

Pressure reducing device

Technical Field

The present invention relates to a pressure reducing device.

Background

The pressure relief device is used in a housing that can have an electrical device. The pressure relief device can include a pressure relief opening formed in a wall of the housing and a pressure relief flap closing the pressure relief opening. A short circuit occurring inside the housing can lead to an arc in the housing. The air surrounding the arc is heated in the housing by the arc, wherein the air expands explosively. The pressure inside the housing increases, wherein the housing may be deformed by the increased pressure. The deformation may rupture the housing, so that this may be dangerous for persons outside the housing. For this reason, a pressure relief opening can be formed in the wall of the housing, which can be closed by a pressure relief flap, so that the pressure caused by the arc can be reduced. The overpressure created in the housing opens a pressure relief flap closing the pressure relief opening, wherein the pressure can escape through the open pressure relief flap.

Known pressure relief devices typically have pressure relief flaps disposed at the pressure relief opening of the housing. A band spring can be located inside the housing, which normally holds the pressure relief flap in the pressure relief opening. The overpressure created inside the housing pushes the relief flap axially outward against the spring force. When the passage is opened between the outer edge of the pressure relief flap and the edge of the pressure relief opening, overpressure can escape from the housing. The pressure relief flap can be sealed against the rim of the opening with an O-ring.

Known pressure relief devices require access to the housing when the pressure relief flap is installed. Due to the sealing solution, the known pressure relief flaps are susceptible to corrosion, wherein the pressure required for opening the pressure relief flaps increases. There is a contact between the pressure relief flaps and the edge of the opening of the housing or between two metal surfaces, on which contact corrosion forms. The opening of the known pressure relief flaps is slowed down by corrosion between the mutually movable metal surfaces. As the O-ring wears, friction between the rubber material and the metal begins to increase the pressure required to open the pressure relief flap significantly.

Disclosure of Invention

The object of the present invention is to propose an improved pressure relief device.

The pressure relief device according to the utility model is defined in the examples.

The pressure relief device can include a pressure relief opening in a wall of the housing and a pressure relief flap closing the pressure relief opening.

The pressure relief device is characterized in that it comprises

A metal plate having an inner face and an opposite outer face,

a sealing element having an inner face and an opposite outer face, wherein the outer face of the sealing element is arranged on the inner face of the metal sheet, and the inner face of the sealing element can be arranged on a horizontal plane which is arranged in connection with the pressure-relief opening, wherein an overpressure which arises in the interior space of the housing moves the metal sheet away from the housing and ultimately leads to a tearing of the sealing element, wherein the overpressure can escape from the housing through the pressure-relief opening.

The solution according to the utility model significantly improves the functionality of the pressure relief device, especially in narrow spaces.

The sealing of the pressure relief flap is integrated as a fixed component of the pressure relief flap and the function of the pressure relief flap is to provide a large area for pressure relief.

In this new pressure relief device, the spring that secures and seals the relief flap can be completely eliminated.

The sealing of the pressure relief flap takes place against a horizontal plane which is connected with the pressure relief opening.

By means of the seal integrated at the pressure relief flap and its design, corrosion can be prevented from forming between the pressure relief flap and the wall of the housing. Eliminating corrosion between the pressure relief flap and the wall of the housing ensures that the pressure relief flap opens quickly under all conditions.

In the present application, the term "housing" includes all spaces closed by wall portions. The wall portion can have a closable door or flap. In principle, the housing can have any shape.

The surface of the pressure-reducing opening is the face that closes the pressure-reducing flap.

Drawings

Hereinafter, the present invention is described in detail with reference to the accompanying drawings by way of example. The figures show:

figure 1 shows a housing provided with a pressure relief opening,

figure 2 shows the housing with the pressure relief opening closed by the pressure relief flap,

figure 3 shows an exploded view of the pressure relief flap,

figure 4 shows an edge structure in a pressure relief device,

fig. 5 shows another edge configuration in a pressure relief device.

Detailed Description

Fig. 1 shows a housing provided with a pressure relief opening, and fig. 2 shows a housing in which the pressure relief opening is closed by a pressure relief flap.

The housing 10 can be made of a rectangular parallelepiped piece. At least one wall 20 of the housing 10 can have a pressure relief opening 200. The relief opening 200 can be located at any location on the wall of the housing 10. The housing 10 can have only one relief opening 200 in the wall 20 or a plurality of relief openings 200 in the wall. Alternatively, the housing 10 can have one or more relief openings 200 on a plurality of wall portions.

Each pressure relief opening 200 located in the housing 10 can be closed by a pressure relief flap 100. The housing 10 can thus have one or more pressure relief flaps 100. The housing 10 can include electrical devices such as bus bars, drivers, converters, capacitors, coils, and the like.

Figure 3 shows an exploded view of the pressure relief flap.

In this embodiment, the pressure relief flap 100 includes a metal plate 110, a seal 120, and a threaded portion 130.

The pressure relief flap 100 can include an axis X1-X1 that is perpendicular to the face that closes the pressure relief opening 200.

The metal plate 110 can be composed of a closed metal plate. The metal plate 110 can be circular and have a constant cross-section. The metal plate 110 can include an inner face 111 and an outer face 112 opposite the inner face 111, and a radially outer edge 113, the outer edge 113 constituting an outer circle of the metal plate 110. In the case where the metal plate 110 is symmetrical, the axis X1-X1 can extend through the center point of the metal plate 110. In the case where the metal plate 110 is asymmetric, the axis X1-X1 can extend through a point located in the center of the metal plate 110. In the case where the inner face 111 and the outer face 112 of the metal plate 110 are parallel horizontal planes, the axis X1-X1 is perpendicular to the inner face 111 and the outer face 112 of the metal plate 110. The metal plate 110 can have a thickness T10 that is determined based on a perpendicular distance between the inner face 111 and the outer face 112 of the metal plate 110. The metal plate 110 also has an outer diameter D10. The outer diameter D10 of the metal plate 110 can be larger than the diameter of the relief opening 200 located on the wall of the housing 10. The metal plate 110 can completely cover the relief opening 200 located on the wall portion 20 of the case 10. The outer edge of the metal plate 110 can extend over the edge of the opening 200 of the wall portion 20 of the housing 10.

The seal 120 can be constructed of an annular member. The outer diameter D20 of the seal 120 can correspond to the outer diameter D10 of the metal plate 110. There may be an opening O20 in the center of the seal 120 that can be substantially circular. Another possibility is that the seal 120 is band-shaped, wherein there need not be an opening O20 in the center of the seal 120. The diameter D21 of the opening O20 of the seal 120 can be less than the outer diameter D20 of the seal 120. The seal 120 includes an inner face 121, an outer face 122 opposite the inner face 121, and a radially outer edge 123 that forms an outer circle of the seal 120. The axis X1-X1 of the pressure relief flap 100 can extend through the center of the seal 120. The axis X1-X1 can extend perpendicular to the face of the opening O20 of the seal 120. The axis X1-X1 can also extend perpendicular to the inner face 121 and the outer face 122 of the seal 120. Seal 120 has a thickness T20 that is dependent on the perpendicular distance between inner face 121 and outer face 122 of seal 120.

The seal 120 can include a radially inner portion 124 and a radially outer portion 125. The thickness of the portion 124 of the inner side of the seal 120 can constitute the thickness T20 of the seal 120. The thickness T21 of the portion 125 of the outer side of the seal 120 can be less than the thickness T20 of the portion 124 of the inner side of the seal 120. The outer face of the portion 125 outside of the seal 120 can be joined with the outer face 122 of the portion 124 inside of the seal 120. The inner face 126 of the outer portion 125 of the seal 120 can be higher than the inner face 121 of the seal 120. The inner face 126 of the part 125 outside the seal 120 can constitute a uniform annular face which abuts against the outside of the wall 20 of the housing 10 around the edge 200 of the pressure-relief opening on the wall 20. The portion 124 of the inside of the seal 120 can remain inside the edge of the reduced-pressure opening 200. The inner side 121 of the inner part 124 of the seal 120 and the inner side 126 of the outer part 125 of the seal 120 can be connected to one another on an inclined connecting surface 127. The outer diameter D22 of the portion 124 of the inside of the seal 120 can be greater than the diameter D21 of the opening O20 of the seal 120, but less than the outer diameter D20 of the seal 120. The inner face 121 of the seal 120 can abut against and be secured to the outer face 132 of the threaded portion 130. The inner face 121 of the seal 120 and the outer face 132 of the threaded portion 130 can be formed by horizontal planes.

The threaded portion 130 can be annular. An outer diameter D30 of threaded portion 130 can correspond to an outer diameter D22 of portion 124 of the inside of seal 120. In the center of the threaded portion 130 there is an opening O30, which can be substantially circular. The diameter D31 of the opening O30 of the threaded portion 130 can be smaller than the outer diameter D30 of the threaded portion 130. The threaded portion 130 includes an inner face 131, an outer face 132 opposite the inner face 131, and a radially outer edge 133 that forms an outer circle of the threaded portion 130. The axis X1-X1 of the pressure relief flap 100 can extend through a center point of the threaded portion 130. The axis X1-X1 can extend perpendicular to the surface of the opening O30 of the threaded portion. The axis X1-X1 can also extend perpendicular to the inner side 131 and the outer side 132 of the threaded portion 130. The threaded portion 130 has a thickness T30 that is dependent on the vertical distance between the inner face 131 and the outer face 132 of the threaded portion 130. A radially outer edge 133 of the threaded portion 130 can be provided with an external thread 134. The radially outer edge 133 of the threaded portion 130 can be rounded.

The metal plate 110, the seal 120, and the threaded portion 130 can be fixed to each other with the seal 120 between the metal plate 110 and the threaded portion 130. The outer face 122 of the seal 120 can be fixed to the inner face 111 of the metal plate 110, and the inner face 121 of the seal 120 can be fixed to the outer face 132 of the threaded portion 130. The outer diameter D20 of the seal 120 can be as large as the outer diameter D10 of the metal plate 110. Outer diameter D30 of threaded portion 130 can be as large as outer diameter D22 of inner portion 124 of seal 120.

The function of pressure relief flap 100 is explained in connection with fig. 4.

Fig. 4 shows an edge structure in the pressure reducing device.

In the embodiment shown in the figure, the pressure relief flaps 100 are arranged on pressure relief openings 200 which are located on the wall 20 of the housing 10. The wall 20 of the housing or cabinet 20 includes an inner face 21 and an opposite outer face 22 and a thickness T2. The thickness T2 of the wall portion 20 depends on the perpendicular distance between the inner side 21 and the outer side 22 of the wall portion 20. The edge 210 of the pressure relief opening 200 can be stepped. The edge 210 of the pressure-reduction opening 200 can have, starting from the outer face 22 of the wall part 20, a first vertical portion 211, a horizontal portion 212 following it and a second vertical portion 213 following the horizontal portion. The second vertical portion 213 of the edge 210 of the pressure relief opening 200 can have mating threads 220. The horizontal portion 212 of the edge 210 of the pressure-relief opening 200 can form an annular flat on the edge 210 of the pressure-relief opening 200. The horizontal portion 212 is at a distance T1 from the outer face 22 of the wall portion 20. The distance T1 of the horizontal portion 212 from the outer face 22 of the wall portion 20 is adapted to the thickness of the metal plate 110 and the seal 120. The distance T1 can be substantially the same as or greater than the combined thickness T10+ T21 of the metal plate 110 and the outer portion 125 of the seal 120.

The inner face 121 of the inner portion 124 of the seal 120 is secured to the outer face 132 of the threaded portion 130. The inner face 121 of the inner portion 124 of the seal 120 constitutes the inner face of the seal 120.

There can be an inclined portion 214 between the horizontal portion 212 and the second vertical portion 213 of the edge 210 of the pressure-relief opening 200.

The pressure relief flap 100 can be rotated onto mating threads 220 on the second vertical portion 213 of the rim 210 of the pressure relief opening 200 by means of the external threads 134 on the threaded portion 130. In the radial direction of the seal 120, the inner face 126 of the outer part 125 abuts against a horizontal part 212 of the edge 210 of the pressure-relief opening 200 on the wall 20 of the housing 10. In the radial direction of the seal 120, the vertical face of the inner portion 124 abuts against a corresponding vertical portion 213 of the edge 210 of the pressure-relief opening 200. The seal 120 can also have an inclined surface that abuts an inclined surface 214 between the horizontal portion 212 and the second vertical portion 213 of the rim 210. The relief opening 100 closes a relief opening 200 in the wall 20 of the housing 10. In the radial direction of the seal 120, the outer portion 125 is thus located between a horizontal portion 212 of the edge 210 of the decompression opening 200 on the wall of the housing 10 and the lower face 111 of the metal plate 110. The outer face 112 of the metal plate 110 of the pressure relief flap 100 can lie in substantially the same horizontal plane as the outer face of the wall portion 20 of the housing 10. The inner face 131 of the threaded portion 130 of the pressure relief flap 100 can lie substantially on the same horizontal plane as the inner face 21 of the wall portion 20.

The function of the pressure relief flap 100 is explained below. The overpressure generated in the interior of the housing 10 moves the metal sheet 110 axially X1-X1 away from the housing 10 and ultimately leads to a tearing of the seal 120, wherein the overpressure can escape from the housing 10 through the relief opening 200. A short circuit occurring within the housing 10 can lead to an overpressure in the housing 10. This overpressure in the housing 10 is directed towards the inner face 111 of the metal plate 110 of the pressure relief flap 100. Due to the force pushing away from the housing 10, the metal plate 110 of the pressure relief flap 100 moves away from the wall portion 20, wherein the tensile stress of the axial orientation X1-X1 is directed towards the seal 120. The seal 120 can be designed such that the seal 120 can expand slightly in the axial direction X1-X1, after which the seal 120 breaks apart. If the seal 120 breaks open, the overpressure can escape from the housing 10 through the relief opening 200.

The wall portion 20 of the housing 10 where the pressure relief opening 200 is present can be close to a surface of a building, such as a wall, or close to a surface of a housing of another device. Movement of the pressure relief flap 100 away from the wall portion 20 of the housing 10 in the axial direction X1-X1 can thus be limited. Thus, when the pressure within the housing 10 increases and the pressure relief flaps 100 move away from the wall portion 20, the metal plates 110 of the pressure relief flaps 100 can impinge on the surface of the housing of the building or of another device. A discharge path for the pressure can then be formed in the space between the pressure relief flap 100, the metal plate 110 and the wall 20, whereby the pressure can escape from the housing 10 in the radial direction when the seal 120 is broken open.

Fig. 5 shows another edge configuration in a pressure relief device.

In the embodiment shown in the figures, the pressure relief flaps 100 are provided at pressure relief openings 200 located at the wall 20 of the housing 10.

The edge structure of the pressure relief flap shown in fig. 5 differs from the edge structure shown in fig. 4 as follows. The inner face 126 of the outer part 125 of the seal 120 abuts directly against the outer face 22 of the wall 20. The edge 210 of the pressure-relief opening 200 can thus comprise only the vertical portion 213 with the mating thread 220. In this alternative, the metal sheet 110 of the pressure relief flap 100 remains outside the outer face 22 of the wall portion 20.

The embodiment according to fig. 5 is used in a situation where there is sufficient space outside the pressure relief flap 100 in the axial direction X1-X1 for axial X1-X1 movement of the pressure relief flap 100 when the pressure inside the housing 10 increases. The pressure relief flaps 100 partially protruding from the wall of the housing 10 may also cause aesthetic defects, making them unusable for this reason.

The embodiment shown in the figures is a housing 10 comprising an electrical device. When the electrical equipment is short-circuited, an arc is generated in the housing, generating an overvoltage which must be reduced in a controlled manner. Such an overvoltage may of course also occur in a housing without any electrical equipment. Inside the housing 10, an internal overvoltage may be generated by something other than an arc of an electrical device. The utility model can of course also be applied to housings without electrical equipment, but in which an overvoltage may occur for another reason.

In the embodiment shown in the figures, the pressure relief flap 100 has a metal plate 110, a seal 120, and a threaded portion. This is an advantageous embodiment. However, in an alternative embodiment, the pressure relief flap 100 can include only one metal plate 110 and seal 120. The outer surface 122 of the seal 120 is fixed to the inner surface 111 of the metal plate 110. The inner surface 121 of the inner part 124 of the seal 120 can be fixed to a horizontal surface which is provided in connection with the decompression opening 200. The inner face 126 of the portion 125 of the outer side of the seal 120 can abut against the outer face 22 of the wall 20 or against a horizontal surface provided on the edge structure 210 of the pressure-reduction opening 200. A separate stop surface on the edge structure 210 of the decompression opening 200 can be provided here on the inner face 121 of the portion 124 on the inside of the seal 120.

That is, the horizontal faces 212, 22, 132 on which the inner face 121 of the seal 120 can be placed in connection with the pressure-reduction opening 200 can be constituted by the horizontal face 212 (fig. 4) constituted on the edge 210 of the pressure-reduction opening 200 or by the outer face 22 (fig. 5) of the wall 20 of the housing 10 or by the outer face 132 of the threaded portion 130.

In the case where the pressure relief flap 100 includes only the metal plate 110 and the seal 120, its geometry need not be circular as in the embodiment shown in the figures. The shape of the metal plate 110 and the seal 120 can therefore also be a shape other than circular. The shape of the metal plate 110 and the seal 120 can be any symmetrical or asymmetrical geometry. The shape of the metal plate 110 and the seal 120 can be, for example, an oval, a rectangle, a polygon, or a trapezoid. The shape of the pressure relief opening 200 of the wall portion 20 of the casing 10 can correspond to the shape of the metal plate 110 and the seal 120, but it can also have a different shape. The relief opening 200 located on the wall 20 of the housing 10 can also be formed by a plurality of sub-openings, wherein the sub-openings are covered by the same metal plate 110. In this case, an oriented outflow channel can be formed by the respective sub-opening.

In the embodiment shown in the figures, the seal 120 is formed by an annular portion. There is an opening O20 in the center of the annular portion. The seal 120 may alternatively be formed by a planar member. There may then be no opening O20 in the center of the seal 120. Instead of the opening O20, there may then be a uniform, plate-like central portion of the seal 120. The thickness of the central portion can be equal to or less than the thickness T20 of the inner portion 124 of the seal.

In the embodiment shown in the figures, the pressure relief opening 200 has mating threads 220. This is an advantageous embodiment. The wall 20 of the housing 10 can however have only one relief opening 200. The decompression opening 100 can be fixed in the interior of the housing 10 by a nut. The nut will be rotated onto the threads 134 of the threaded portion 130 inside the housing 10, wherein the nut abuts against the inner face 21 of the wall portion 20 of the housing 10. The mating thread 220 may then not be a fixed component of the housing 10.

The situation can also be arranged such that there will be only one pressure relief opening 200 on the wall 20 of the housing 10 and a collar of the kind having mating threads 220 will be adapted to this pressure relief opening 200. The collar can be fixed to the wall 20 of the housing 10. The mating thread 220 may then not be a fixed component of the housing 10.

The threaded portion 130 is advantageously circular and at least the relief opening 200 in the threaded portion 130 is also circular. Therefore, the shape of the metal plate 110 can be different from a circular shape. The shape of the metal plate 110 can be any symmetrical or asymmetrical geometry. The shape of the metal plate 110 can be, for example, an ellipse, a rectangle, a polygon, or a trapezoid.

The shapes of the opening O20 of the seal 120 and the opening O30 of the threaded portion 130 are circular in the drawings. However, the shape of these openings O20, O30 can be any arbitrary symmetrical or asymmetrical geometry. The shape of the openings O20, O30 can be, for example, oval, rectangular, polygonal, or trapezoidal.

The pressure relief flap 100 functions in the same manner in all embodiments. The overpressure generated in the housing 10 moves the metal sheet 110 axially X1-X1 away from the wall 20 of the housing 10, wherein the seal 120 expands in the axial direction X1-X1. If the pressure increases further, the seal 120 tears, wherein the overpressure can escape from the housing 10 through the relief opening 200.

The metal plate 110 and threaded portion 130 of the pressure relief flap 100 can be made of metal, such as aluminum or a hard polymer, such as fiberglass reinforced plastic.

The seal 120 can be made of a soft polymer, such as rubber, silicone or TPE plastic.

The seal 120 and the threaded portion 130 can be manufactured from the same component. Here, a soft polymer can be used as a material constituting the sealing member 120 and the threaded portion 130. The pressure reduction flap 100 can here consist of two materials, which can be connected as one component by casting and/or by 2D casting techniques and/or gluing. The fixing of the materials to one another can be achieved by adhesion between the components and/or by shape classification.

The embodiment shown in fig. 4 can also be modified as follows. The threaded portion 130 is omitted completely and constitutes a further level below the inner face 121 of the portion 124 inside the seal 120 at the relief opening 200. The inner surface 121 of the inner part 124 of the sealing element 120 is fixed, for example by gluing, to a horizontal surface which is formed in connection with the decompression opening 200.

In the embodiment shown in the figures, the inner face 111 and the outer face 112 of the metal plate 110 of the pressure relief flap 100 are constituted by parallel horizontal planes. This is an advantageous embodiment. However, the horizontal planes 111, 112 need not be parallel. The inner face 111 and the outer face 112 also need not be formed by horizontal planes, but can be curved, for example. However, in the seal 120, it is advantageous that the inner face 111 of the metal plate 110 is formed by a horizontal plane.

The utility model is not limited to the embodiments described above, but can be implemented in different variants within the scope of protection defined by the claims.

Claims (9)

1. A pressure relief device comprising a pressure relief opening (200) in a wall portion (20) of a housing (10) and a pressure relief flap (100) closing the pressure relief opening (200), characterized in that the pressure relief opening (200) comprises:

a metal plate (110) having an inner face (111) and an opposite outer face (112),

a sealing element (120) having an inner surface (121) and an opposite outer surface (122), wherein the outer surface (122) of the sealing element (120) is fixed to the inner surface (111) of the metal sheet (110), and the inner surface (121) of the sealing element (120) can be placed on a horizontal surface (212, 22, 132) which is provided in connection with the decompression opening (200), wherein

An overpressure which is generated in the interior of the housing (10) moves the metal sheet (110) away from the housing (10) and ultimately leads to a tearing of the seal (120), wherein the overpressure can escape from the housing (10) through the relief opening (200).

2. The pressure relief device of claim 1, wherein the pressure relief flap (100) further comprises:

a threaded portion (130) having an inner face (131), an opposite outer face (132), a radially outer edge (133) having a thread (134), and an opening (O30) in a center of the threaded portion (130), wherein

An outer surface (132) of the threaded portion (130) is arranged on an inner surface (121) of the seal (120), wherein the outer surface (132) of the threaded portion (130) forms the horizontal plane on which the inner surface (121) of the seal (120) is arranged, wherein

The pressure relief flap (100) is fixed to a pressure relief opening (200) of the housing (10) by rotation such that the thread (134) of the threaded portion (130) rests on a mating thread (220) provided in connection with the pressure relief opening (200), and the seal (120) seals the metal plate (110) in connection with the pressure relief opening (200).

3. The pressure relief device according to claim 2, wherein the mating thread (220) is formed as a fixed component of a rim structure (210) of the pressure relief opening (200) of the housing (10).

4. The pressure relief device of claim 2, wherein the mating threads (220) are formed in a separate component with respect to the housing (10).

5. The pressure relief device according to claim 4, characterized in that the mating thread (220) is constituted on a collar that mates with a pressure relief opening (200) of the wall (20) of the housing (10), the collar being detachably seated on the wall (20) of the housing (10).

6. The pressure relief device according to claim 4, wherein the mating thread (220) is constituted on a nut which is rotated within the housing (10) onto the thread (134) of the threaded portion (130), wherein the pressure relief flap (100) is locked on the wall portion (20) of the housing (10).

7. The pressure relief device of any of claims 1-6, wherein the seal (120) comprises an inner portion (124) and an outer portion (125) in a radial direction, wherein a thickness (T21) of the outer portion (125) of the seal (120) is less than a thickness (T20) of the inner portion (124) of the seal (120), and a step is formed on an inner face of the seal (120).

8. The pressure relief device according to claim 7, characterized in that the pressure relief opening (200) has a stepped edge, the level (212) of which constitutes a level arranged in connection with the pressure relief opening (200), against which the inner face (126) of the part (125) of the outer side of the seal (120) abuts when the pressure relief flap (100) is fixed on the pressure relief opening (200).

9. The decompression arrangement according to claim 7, characterized in that the outer face (22) of the wall (20) of the housing (10) constitutes a horizontal plane which is arranged in connection with the decompression opening (200), against which the inner face (126) of the part (125) outside the seal (120) abuts when the decompression flap (100) is fixed on the decompression opening (200).

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