Pressure equalisation device for a housing

Abstract

The present invention relates to a pressure equalisation device for a housing, having a main body which has an inner side and an outer side and which is designed as a hollow cylinder at least in some regions, wherein the main body has a housing-side gas passage opening on its first base surface and at least one gas overpressure opening in its lateral surface, and a housing seal which is arranged on the outer side of the main body in the circumferential direction and has a first sealing region and a second sealing region. When the pressure equalisation device is installed in the housing, the first sealing region of the housing seal rests against the housing and against the lateral surface and seals the housing with respect to the pressure equalisation device. The second sealing region fully covers the gas overpressure opening and is elastically outwardly deformable at a pressure difference, between inner pressure at the inner side of the main body and outer pressure at the outer side of the main body, which exceeds a threshold value, as a result of which a flow-guiding connection between inner side and outer side through the gas overpressure opening is provided.

Description

WITTEWELLER. Applicant: Parker Hannifin EMEA S.ä.rl 07.12.2023 La Tuiliere 6 4067P115WO - SK 1163 Etoy SWITZERLAND Pressure equalization device for a housing

[0001] The present invention relates to a pressure compensation device for a housing and a housing with a pressure compensation device (also generally referred to as a valve).

[0002] DE 10 2017 003 360 B3 discloses a pressure compensation device for a housing. This pressure compensation device comprises an inner side, an outer side, and a grid-shaped cage with a gas passage opening. The gas passage opening connects the inner side and the outer side in a flow-conducting manner, depending on the differential pressure, as needed, and is delimited in the direction of its flow by an inner and an outer edge. The gas passage opening is covered by a gas-permeable membrane, and the membrane is designed as a nonwoven composite part and comprises at least one nonwoven layer. A pressure relief valve designed as a burst protection device is assigned to the membrane in a functionally parallel circuit.

[0003] The pressure relief valve comprises a circular, convexly curved shield made of an elastomeric material, whose inner circumference essentially corresponds to the outer edge. The inner circumference sealingly contacts the diaphragm on the side facing the outside in the direction of flow. The inner circumference rests tightly against the outer circumference of the diaphragm to prevent flow short-circuits in the contact area during the intended use of the pressure compensation device.

[0004] The shield has an outer circumference designed as a sealing lip, wherein the sealing lip is in sealing contact with a sealing surface of the cage under elastic prestress, wherein the membrane and the shield together spatially separate the inside and the outside from one another and wherein the sealing lip can be lifted off the sealing surface and brought into the open position for emergency degassing of the inside and to provide a flow-conducting connection between the inside and outside. If the pressure on the inside of the pressure compensation device exceeds a predetermined threshold value, which is below the bursting pressure of the housing, the sealing lip of the shield lifts off the sealing surface of the cage for emergency degassing until the pressure falls below the critical threshold value again. The sealing lip then automatically rests on the sealing surface again to form a seal.

[0005] The convexly curved shield is relatively long and, during emergency degassing, is moved like a lever, lifting the sealing lip from the cage's sealing surface. Over time, the force required to achieve this changes due to wear and service life, so that the predetermined threshold also changes over time. The desired and preset behavior for ensuring emergency degassing thus changes, so that after some time, emergency degassing sometimes only occurs at a higher pressure on the inside or, if the shield's pretension decreases, even at a lower pressure.

[0006] Against this background, the present invention is based on the object of creating a pressure compensation device for a housing which overcomes the disadvantages of known pressure compensation device and ensures the same reliable emergency degassing function with set behavior even over a long period of time.

[0007] According to one aspect of the present invention, a pressure compensation device for a housing is provided, comprising a base body with an inner side and an outer side, which is designed at least in regions as a hollow cylinder, wherein the base body has a housing-side gas passage opening on its first base surface and at least one gas overpressure opening in its outer surface, and a housing seal which is arranged on the outer side of the base body in the circumferential direction and has a first sealing region and a second sealing region, wherein the first sealing region of the housing seal rests against the housing and the outer surface of the housing when the pressure compensation device is mounted in the housing and seals the housing against the pressure compensation device, and the second sealing region completely covers the gas overpressure opening,and wherein the second sealing region of the housing seal is elastically deformable outwardly in the radial direction when the pressure difference between the internal pressure on the inside of the base body and the external pressure on the outside of the base body is above a threshold value, thereby providing a flow-conducting connection between the inside and the outside through the gas overpressure opening.

[0008] According to a further aspect of the present invention, a housing with such a pressure compensation device is provided.

[0009] Preferred embodiments of the invention are defined in the dependent claims.

[0010] The invention is based on the idea of ​​arranging and designing the housing seal, which ensures emergency degassing, in a completely different way. In particular, the housing seal does not have a long lever arm like the shield used in the known pressure compensation device for emergency degassing and can therefore also be significantly less wear. Furthermore, the housing seal is positioned around the outside of the base body, allowing the radial forces required for emergency degassing to deform part of the housing seal to be defined much more accurately, and the housing seal is also held more effectively to the base body. Overall, the housing seal used according to the invention thus exhibits significantly more stable and improved long-term performance with regard to emergency degassing. Furthermore, the proposed housing seal requires fewer and simpler components, which also reduces assembly costs.

[0011] In a preferred embodiment, the base body is closed at its second base surface, and a circumferential projection is arranged on the outside of the base body in the region of the second base surface. This projection has a larger outer diameter than the housing seal. This ensures protection against external contamination or damage (e.g., from cleaning with a high-pressure jet) on the side of the second base surface. Furthermore, the circumferential projection also protects the housing seal.

[0012] In an alternative embodiment, the base body has a gas passage opening on the ambient side on its second base surface, which is completely covered by a gas-permeable membrane that allows gas exchange even when the pressure difference between the internal and external pressure is below the threshold value. At lower pressure differences between the internal and external pressure, the membrane allows gas to pass through for pressure equalization in both directions, i.e., from outside to inside or from inside to outside, in each case in the direction of the lower pressure level. Only at higher pressure, when pressure equalization by the membrane is no longer sufficient, or in the event of a very rapid pressure increase, does the housing seal open, thus enabling emergency degassing through the gas pressure opening in the outer surface of the housing.In the direction from outside to inside, however, emergency degassing is generally not possible, since the housing seal cannot open if the external pressure is higher than the internal pressure.

[0013] In this embodiment, a cover can also be provided which completely covers the membrane on the outside and provides a larger It has a larger outer diameter than the housing seal. This cover provides the protection described above against external contamination or damage, especially to the diaphragm.

[0014] The cover can, for example, have two cover plates, wherein a first cover plate facing the membrane has a central opening that allows gas to pass from and to the membrane, and wherein the second cover plate spaced from the first cover plate is closed, in particular completely closed, at least in the area opposite the central opening of the first cover plate. In particular, spacer ribs can be arranged between the cover plates, between which gas can flow to and from the membrane. The second (outer) cover plate offers the protection against external contamination or damage described above. Escaping gas is also deflected by this cover plate and flows outwards between the cover plates in a radial direction. The escaping gas can then be discharged vertically upwards through the surrounding protective ring or installation space.The radial diversion, at least in some sections, thus offers additional protection for the membrane.

[0015] In a further embodiment, the base body has a plurality of circumferentially extending gas relief openings in its lateral surface, all of which are covered by the second sealing region of the housing seal. The gas relief openings are preferably slot-shaped and are at substantially the same distance from the first base surface. This ensures optimal and rapid gas passage in the event of emergency degassing. The size and shape of the gas relief openings or slots are preferably based on the required cross-section to vent the desired amount of gas per time interval. Instead of slots, the gas relief openings can also have larger rectangular, oval, or round (or other) shapes.

[0016] Preferably, the housing seal is annular and has an L-shaped cross-section. A first, in particular shorter, leg of the housing seal forms the first sealing area, which rests against a circumferential retaining projection attached to the lateral surface of the base body. A second, in particular The longer leg of the housing seal forms the second sealing area, which rests against the outer surface of the base body and completely covers the gas pressure relief opening. When the pressure difference between the internal pressure on the inside of the base body and the external pressure on the outside of the base body exceeds a threshold value, it tilts relative to the first leg. This design offers reliable function and enables precise and permanent fixation of the housing seal to the base body. In particular, the L-shaped design prevents the housing seal from slipping in the radial direction.

[0017] In the area of ​​the first base surface of the base body, fastening means for detachable attachment can also be arranged in or on a mounting opening of the housing. For example, the fastening means can be designed in the form of a screw or snap connection. This allows the pressure compensation device to be easily, quickly, and securely attached to the housing, for example, in a hole in the housing wall, or to the housing itself, without the need for additional fastening means (e.g., screwing, welding, soldering, etc.).

[0018] In a further embodiment, the base body is designed, at least in some regions, as a straight hollow cylinder with a circular cross-section. In principle, however, the base body can also have a different cross-section, e.g., a square or oval cross-section, and a curved or curved shape in the axial direction. Furthermore, the diameter is not necessarily constant in the axial direction, but can vary in the axial direction, e.g., by tapering conically or changing in steps.

[0019] In a further embodiment, the pressure compensation device has a protective body which encloses the housing seal and at least partially the base body in the circumferential direction. The protective body is preferably ring-shaped and has at least one further (preferably circumferentially extending) gas overpressure opening in its outer surface and / or between the outer surface and the second base surface of the base body. Such a protective body, for example in the form of a protective ring, is particularly advantageous when installing the pressure compensation device in a thin housing wall. In such a case, the pressure compensation device sits on the The housing surface is not mounted in a recessed hole. The housing cannot serve as a splash guard, as is the case with the pressure equalization device installed in a recessed hole. The additional protective body thus takes over the missing external protection. The escaping pressure can then be dissipated upwards and / or laterally without causing contamination or damage, for example, from a water jet from outside, which cannot then directly impact the housing seal.

[0020] It is understood that the features mentioned above and those to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

[0021] Embodiments of the invention are illustrated in the following drawings and explained in more detail in the following description. They show: Fig. 1 shows a cross section through a first embodiment of the pressure compensation device according to the invention when mounted in a housing; Fig. 2 shows a cross section through a second embodiment of the pressure compensation device according to the invention; Fig. 3 shows a cross section through the second embodiment of the pressure compensation device according to the invention in a first operating state; Fig. 4 shows a cross section through the second embodiment of the pressure compensation device according to the invention in a second operating state; Fig. 5 is a perspective external view of the second embodiment of the pressure compensation device according to the invention; Fig. 6 shows a cross section of a third embodiment of the pressure compensation device according to the invention; Fig. 7 is a cross-sectional view of the pressure compensation device shown in Fig. 6 when mounted in a housing; and Fig. 8 shows a partial cross-section through a fourth embodiment of the pressure compensation device according to the invention in a state mounted on a housing.

[0022] Fig. 1 shows a cross-section through a first embodiment of the pressure compensation device 1 according to the invention (alternatively also referred to as a valve) mounted in a housing 2. For this purpose, the housing 2 has a mounting opening 3, for example in the form of a bore, into which the pressure compensation device 1 can be mounted, for example by inserting, clipping, snapping, or screwing.

[0023] The pressure equalization device 1 comprises a base body 10 with an inner side 11 and an outer side 12, which is designed at least partially as a hollow cylinder. On its first base surface 13, the base body 10 has a housing-side gas passage opening through which gas can flow from the interior of the housing 2 into the interior of the base body 10, as indicated by the arrow 40. In its outer surface 14, the base body 10 has at least one gas overpressure opening 15 through which gas can flow from the interior of the base body into the exterior in the event of emergency degassing, as indicated by the arrows 41. The base body 10 is designed in one piece in the present case, but can alternatively be constructed in multiple parts.

[0024] The pressure compensation device 1 further comprises a housing seal 20, which is arranged on the outer side 12 of the base body 10 in the circumferential direction and has a first sealing region 21 and a second sealing region 22. The first sealing region 21 of the housing seal 20 lies, when the pressure compensation device 1 is mounted in the housing 2, as shown in Fig. 1, on the housing 2 and on the outside on the outer surface 14 of the base body 10 and seals the housing 2 against the pressure compensation device 1.

[0025] The second sealing region 22 completely covers the gas relief opening 15. When the pressure difference between the internal pressure on the inner side 11 of the base body 10 and the external pressure on the outer side 12 of the base body 10 exceeds a threshold value, the second sealing region 22 of the housing seal 20 elastically deforms outward in the radial direction, thereby providing a flow-conducting connection between the inner side 11 and the outer side 12 through the gas relief opening 15, as indicated by the arrows 42 (the elastically deformed second sealing region 22 is not shown here).

[0026] In the embodiment shown, the base body 10 is closed at its second base surface 16, for example in the form of a closed lid. In the area of ​​the second base surface 16, a circumferential projection 17 is arranged on the outer side 15 of the base body 10, which projection has a larger outer diameter than the housing seal 20. This protects both the base body 10 and the housing seal 20 from contamination or damage, for example, from the water jet of a high-pressure cleaner. The projection 17 can have an edge 18 that is curved or folded toward the housing 1, so that only a small gap remains between the housing and the edge 18.

[0027] In the illustrated embodiment, the base body has a plurality of (in this case, two) circumferentially extending gas overpressure openings 15 in its lateral surface, all of which are covered by the second sealing region 22 of the housing seal 20. The gas overpressure openings 15 are slit-shaped and are at substantially the same distance from the first base surface 13.

[0028] In the embodiment shown, the housing seal 20 is annular and has an L-shaped cross-section. The first sealing region 21 is formed by a first (preferably shorter) leg of the housing seal. This leg lies on a circumferential groove 22 attached to the lateral surface 14 of the base body 10. Retaining projection 19. The second sealing area 22 is formed by a second (preferably longer) leg of the housing seal 20, which rests against the outer surface 14 of the base body 10 and completely covers the gas pressure relief opening 15. If the pressure difference between the internal pressure on the inner side 11 of the base body 10 and the external pressure on the outer side 12 of the base body 10 exceeds a threshold value, the second leg 22 tilts relative to the first leg 21.

[0029] The threshold at which emergency degassing should begin can be adjusted using various parameters, in particular the choice of material for the housing seal 20, the thickness of the housing seal 20 (in the radial direction), and / or the size and position of the gas relief opening 15. For some applications, the threshold typically lies in a range of approximately 0.05 to 0.3 bar, but ultimately depends on the application. The area of ​​the long leg of the L-shaped housing seal, as well as the preload / overlap of the long leg between the contact point of the housing seal and the outer surface of the housing, can also be decisive for setting the threshold.

[0030] As already mentioned above, fastening means 30 for detachable fastening in or on a mounting opening 3 of the housing 2 are arranged in the area of ​​the first base surface 13 of the base body 10. The fastening means 30 are designed here as a circumferential snap connection (e.g., as an installation clip). However, other fastening means, e.g., in the form of a screw connection, can also be provided to ensure simple and secure installation, which should preferably also be detachable.

[0031] In the illustrated embodiment, the base body is designed, at least in some areas, as a straight hollow cylinder with a circular cross-section. The cross-section is larger in the area of ​​the gas overpressure opening 15 than in the area of ​​the mounting opening 3, in particular in order to form the retaining projection 19 described above. In this area, the diameter of the installation space in the housing is also larger than the diameter of the mounting opening 3, so that there is sufficient space for the second sealing area 22 of the housing seal 20 to move radially in the event of emergency degassing. to move outwards. Above the gas pressure relief opening 15, the wall cross-section of the housing can remain the same or be made smaller.

[0032] Fig. 2 shows a cross-section through a second embodiment of the pressure compensation device 1 according to the invention. The basic structure of the base body 10 and the housing seal 20 corresponds to the structure of the first embodiment shown in Fig. 1. Accordingly, the same reference numerals are used in Fig. 2. However, the base body 10 is designed differently in the area of ​​the second base surface 16 and is not closed there, but has an ambient-side gas passage opening. 50. This is completely covered by a gas-permeable membrane 51, which allows gas to pass through on both sides even when the pressure difference between the internal pressure and the external pressure is below the threshold value.

[0033] Furthermore, a cover 52 is provided which completely covers the membrane 51 on the outside and has a larger outer diameter than the housing seal 20. The cover 52 has two cover plates 53, 54. The first of the membrane The cover plate 53 facing the membrane 51 has a central opening 55 that allows gas to pass from and to the membrane 51. The second cover plate 54, spaced apart from the first cover plate 53, is closed (preferably completely) at least in the area opposite the central opening 55 of the first cover plate 53. Spacer ribs 56 are arranged between the cover plates 53, 54, between which gas can flow from and to the membrane 51.

[0034] Fig. 3 shows a cross-section through the second embodiment (shown in Fig. 2) of the pressure compensation device 1 according to the invention in a first operating state. In this operating state, the pressure difference between the inside and outside is below the threshold value. In this operating state, the second pressure region 22 of the housing seal 20 rests against the outer surface 14, so that no emergency degassing occurs. However, the pressure difference is large enough to allow pressure equalization through the membrane 51, as indicated by the arrows 43.

[0035] Fig. 4 shows a cross-section through the second embodiment (shown in Fig. 2) of the pressure compensation device 1 according to the invention in a second operating state. In this operating state, the pressure difference between the inside and outside is above the threshold value. In this operating state, the second pressure region 22 of the housing seal 20 no longer fully contacts the outer surface 14, but is pushed outward by the higher internal pressure, thereby clearing the path through the gas overpressure opening 15, so that emergency degassing takes place, as indicated by the arrows 41.

[0036] Fig. 5 shows a perspective external view of the second embodiment of the pressure compensation device 1 according to the invention. The housing seal 20 can be seen there, which encloses the outer surface of the base body in a ring-like manner. The housing seal can also be designed accordingly in other embodiments.

[0037] Fig. 6 shows a cross-section of a third embodiment of the pressure compensation device 1 according to the invention. Fig. 7 shows a cross-section of the pressure compensation device 1 shown in Fig. 6 when mounted in a housing 2. In this embodiment, the cover 60 is designed somewhat differently than the cover 52 in the second embodiment shown in Fig. 2. In particular, the cover 52 has only a single cover plate 61, which projects laterally beyond the base body 10 and the housing seal and is convexly shaped, more or less like an umbrella. Channels 62 are formed between the cover plate 61 and the membrane 51, and channels 63 are formed between the interior of the base body 10 and the membrane 51. Gas exchange between the inner side 11 and the outer side 12 can take place through these channels 62, 63, as indicated by the arrows 44 and 45.The convex shape is helpful for vertical installation, as it allows splash water and external dirt to drain away more easily. With a convex shape, the membrane is preferably supported centrally and does not have a central hole.

[0038] Fig. 8 shows a partial cross-section through a fourth embodiment of the pressure compensation device 1 according to the invention. This embodiment is particularly suitable for being mounted on the housing 2 from the outside, while the embodiments described above are particularly suitable for being mounted in the mounting opening 3. , although in the case shown in Fig. 8, the housing 2 also has an opening 3. The assembly can be carried out in the same or similar manner as in the embodiments described above, i.e. by means of a clip, a screw connection, a bayonet lock, etc.

[0039] In this embodiment, the pressure compensation device 1 can have a membrane, as in the second and third embodiments, or be designed without a membrane, as in the first embodiment. Furthermore, the cover can be designed as in one of the embodiments described above.

[0040] Unlike the embodiments described above, the pressure compensation device in this embodiment has a protective body 70 that circumferentially surrounds the housing seal 20 and at least partially the base body 10 and rests on the housing 1, thus having a larger diameter than the opening 3. The protective body 70 is preferably formed as a protective ring that has at least one gas outlet (preferably extending in the circumferential direction) in its outer surface 71 and / or between its outer surface 71 and the second base surface 16 of the base body 10. In the embodiment shown, a plurality of slot-shaped gas outlets 72 are provided in the outer surface 71. Furthermore, a plurality of slot-shaped gas outlets 74 are provided between the outer surface 71 and the second base surface 16 of the base body 10. These outlets are formed, for example, by the uppermost cover plate 54 having corresponding recesses in some areas along its edge.

[0041] The protective body 70 is particularly advantageous when installing the pressure compensation device 1 in a thin housing wall. In such a case, the pressure compensation device 1 sits on the housing surface 4 and is not mounted in a recessed bore, as in the other embodiments. In this case, the housing 2 cannot serve as a splash guard, as in the embodiments described above. The additional protective body 70 thus takes over the missing external protection. The escaping pressure can then be discharged upwards and / or laterally through the gas outlets 72 and 73 without causing contamination or damage, in particular to the housing seal 20, for example, due to a water jet from the outside, which cannot then directly impact the housing seal 20.

[0042] The pressure compensation device according to the invention thus offers various advantages over known solutions. The pre-tension of the canopy in the known solution described above determines the opening pressure. Since the canopy is made of elastomeric material, which is subject to aging, stress relief occurs over time, i.e., the tension in the material is reduced. The opening function of the canopy acts like a flap, so that any change in the pre-tension is consequently intensified along the length of the canopy.

[0043] According to the invention, the housing seal is not designed as a shield, but as a hose-, tubular-, or ring-shaped seal. This allows for better adjustment of the valve's opening point, i.e., the threshold value above which emergency degassing should occur. This housing seal design eliminates the leverage effect, since the preload is generated by expanding the inner diameter of the housing seal. Furthermore, the inventive solution results in a lesser reduction in the housing seal's preload, and thus no or at least a significantly reduced change in the opening pressure over its service life. The inner diameter of the housing seal is smaller than the diameter of the housing on which the housing seal rests, at least in the area of ​​the sealing point / sealing nose.For assembly, the housing seal is expanded and thus sits on the housing with a (pre-)tension that generates the sealing force and compresses the material at the sealing point.

[0044] The inventive design also enables a valve construction with fewer parts compared to existing solutions. The simplest solution consists of only two parts. Finally, improved protection against environmental influences is achieved compared to existing solutions. Installation in or on a housing is also possible easily and reliably.

Claims

Patent claims 1. Pressure compensation device for a housing, comprising a base body with an inner side and an outer side, which is designed at least in part as a hollow cylinder, wherein the base body has a housing-side gas passage opening on its first base surface and at least one gas overpressure opening in its outer surface, and a housing seal which is arranged on the outer side of the base body in the circumferential direction and has a first sealing region and a second sealing region, wherein the first sealing region of the housing seal rests against the housing and the outer surface of the housing when the pressure compensation device is mounted in the housing and seals the housing against the pressure compensation device, and the second sealing region completely covers the gas overpressure opening,and wherein the second sealing region of the housing seal is elastically deformable outwardly in the radial direction when the pressure difference between the internal pressure on the inside of the base body and the external pressure on the outside of the base body is above a threshold value, thereby providing a flow-conducting connection between the inside and the outside through the gas overpressure opening.

2. Pressure compensation device according to claim 1, wherein the base body is closed at its second base surface and wherein in the region of the second base surface a circumferential projection is arranged on the outside of the base body, which projection has a larger outer diameter than the housing seal.

3. Pressure compensation device according to claim 1, wherein the base body has on its second base surface an ambient-side gas passage opening which is completely covered by a gas-permeable membrane which allows gas passage even when the pressure difference between internal pressure and external pressure is below the threshold value.

4. Pressure equalization device according to claim 3, further comprising a cover which completely covers the membrane on the outside and has a larger outer diameter than the housing seal.

5. Pressure compensation device according to claim 4, wherein the cover has two cover plates, wherein a first cover plate facing the membrane has a central opening which allows gas to pass from and to the membrane, and wherein the second cover plate spaced from the first cover plate is closed, in particular completely closed, at least in the area opposite the central opening of the first cover plate.

6. Pressure equalization device according to claim 5, wherein spacer ribs are arranged between the cover plates, between which gas can flow to and from the membrane.

7. Pressure compensation device according to one of the preceding claims, wherein the base body has in its outer surface a plurality of gas overpressure openings extending in the circumferential direction, which are all covered by the second sealing region of the housing seal.

8. Pressure compensation device according to claim 7, wherein the gas pressure relief openings are slit-shaped and have substantially the same distance from the first base surface.

9. Pressure compensation device according to one of the preceding claims, wherein the housing seal is annular and has an L-shaped cross section.

10. Pressure compensation device according to claim 9, wherein a first, in particular shorter leg of the housing seal forms the first sealing area, which rests against a circumferential retaining projection attached to the lateral surface of the base body, and wherein a second, in particular longer leg of the housing seal forms the second sealing area, which rests on the outer surface of the base body and completely covers the gas overpressure opening and which tilts relative to the first leg when the pressure difference between the internal pressure on the inside of the base body and the external pressure on the outside of the base body is above a threshold value.

11. Pressure compensation device according to one of the preceding claims, wherein fastening means for releasable fastening in or on a mounting opening of the housing are arranged in the region of the first base surface of the base body.

12. Pressure compensation device according to claim 11, wherein the fastening means are designed in the form of a screw or snap connection.

13. Pressure compensation device according to one of the preceding claims, wherein the base body is designed at least in regions as a straight hollow cylinder with a circular cross-section.

14. Pressure compensation device according to one of the preceding claims, further comprising a protective body which encloses the housing seal and at least partially the base body in the circumferential direction.

15. Pressure compensation device according to claim 14, wherein the protective body is annular and has at least one further gas overpressure opening in its outer surface and / or between the outer surface and the second base surface.

16. Housing with a pressure compensation device according to one of the preceding claims.

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