Equipment with monitoring device

Abstract

The utility model relates to equipment with a monitoring device, which at least comprises a separating device (12) accommodated in an equipment shell (10), the separating device is provided with a corrugated pipe body (14), the corrugated pipe fold is provided with a single corrugated pipe fold (16), and the corrugated pipe body separates two medium spaces (18 and 20) in the equipment shell (10) in a fluid sealing manner. The utility model is characterized in that a monitoring device (22) is provided for determining the respective position of the bellows body (14) in the device housing (10), said monitoring device having a displacement sensor (24) which is based on the physical principle of magnetostriction.

Description

Technical Field

[0001] This utility model relates to a device with a monitoring device, the device including at least a partition device housed in a device housing, the partition device having a bellows body having a single bellows pleat, the bellows being within the device housing to fluidly and sealingly separate two medium spaces from each other. Background Technology

[0002] In addition to gas tanks, gravity and spring-type accumulators, and diaphragm, bladder, or piston-type accumulators, there are embodiments in which a bellows with a single, continuous corrugated pleat, such as a telescopic bellows or pleated bellows made of metal or plastic, is used as a separator in a separating device. Bellows made of certain plastics, such as PTFE, offer advantages in terms of better resistance to media and heat compared to conventional elastomer materials. Bellows made of metal typically offer advantages including exceptional resistance to media and heat, and expand their potential applications through extremely high sealing performance for media, including gases—that is, achieving absolute sealing and technical airtightness in combination with liquids. These last advantages make metal bellows accumulators unique relative to all other accumulator construction types, particularly when it is practically necessary to eliminate gas losses from hydraulic accumulators and / or not allow their working medium to be contaminated with even a minimal amount of accumulator working gas. The best possible sealing performance for both liquids and gases results in metal bellows accumulators also being well-suited for use as media separators.

[0003] When using telescopic bellows and diaphragm bellows, which are made of metal or plastic and are hereinafter simply referred to as bellows bodies or bellows, the stretched and compressed lengths of the separators must be specifically considered in conjunction with the existing operating pressures and temperatures. The telescopic bellows and diaphragm bellows each have a separator formed by a single, continuous bellows fold between two media sides, particularly between the gas and liquid sides, for example, in a hydropneumatic accumulator. Additionally, the bellows may, depending on the structural type, only withstand a completely defined pressure difference between the inside and outside of the bellows. If the corresponding permissible pressure difference is exceeded, the bellows may lose its function due to bellows wall failure, such as cracks, in the case of a hydraulic supply circuit typically connected to the bellows body. In the case of a nitrogen-filled accumulator, the accumulator loses its gas pre-fill pressure and thus its storage function upon bellows rupture. If the system functions as a media separator or a medium transport device, the media to be separated will undesirably mix in the event of failure. Even if the unacceptable high pressure differential does not immediately cause damage but only pre-damages the bellows body—that is, if the separation function is maintained initially—the bellows wall will still fail sooner or later depending on the operating mode. Therefore, when designing a bellows accumulator as one of the highest priority separation devices, it is important to ensure that unacceptable bellows length and pressure differentials are not introduced into the bellows structure in any of the possible operating conditions (pressure and temperature). If it is preferred that there is no pressure differential on the bellows, then pressure differentials caused by the combination of the elastic properties of the bellows structure and the compression or tension of the bellows folds are excluded. These bellows-specific pressure differentials are typically determined to be so small that the bellows can withstand the pressure differential without problems.

[0004] In view of the above problems, according to the teachings of DE10009865B4, a method has been proposed, particularly in the form of a pulsating damper, for a hydraulic-pneumatic pressure accumulator: an accumulator housing comprising a gas space for accommodating a gas filler that generates preload pressure and an oil space, wherein a bellows or metal bellows is provided to separate the gas space and the oil space, the bellows or metal bellows being closed at one end by an end plate and connected to the accumulator housing at its other end such that the internal space of the accumulator housing constitutes the oil space. Furthermore, an oil passage constructed in the wall of the accumulator housing is introduced as a connecting side, the oil passage leading into the oil space. Mechanical travel limits are provided to both sides of the bellows by a stop device that restricts the movement of the bellows' end plate (the stop device having a first stop and a second stop, the first stop being formed by a tube extending along its inner side inside the metal bellows from the oil passage inlet to near the inner side of the end plate, and the second stop being formed by a second tube extending concentrically with the tube, extending from the wall of the accumulator housing in the gas space to near the outer side of the end plate of the metal bellows), such that the contraction and extension of the bellows do not exceed a predetermined minimum or maximum bellows length. Because free displacement is thus limited when the bellows is stretched and compressed, unacceptable high pressure differentials are not caused, and in this respect, the bellows will not fail within the aforementioned range. However, the mechanical stops on the corresponding travel limiting devices cause additional mechanical loads on the bellows' design, which may reduce the bellows' service life.

[0005] Given this uncertainty in the operation of the bellows, it is meaningful to monitor the bellows in detail. Therefore, as disclosed in EP3475584B1, it is possible to determine the corresponding piston position occupied by the piston in the working chamber on the oil side when the liquid pressure is given in the hydraulic-pneumatic piston accumulator, thereby determining the height of the filling pressure of the working gas in the corresponding working chamber and thus enabling monitoring of the piston accumulator in normal functionality. Utility Model Content

[0006] To this end, a hydraulic-pneumatic piston accumulator is provided, having an accumulator housing defining a longitudinal axis, in which a piston is longitudinally movable between two opposing housing covers. The piston within the housing separates a medium space for a compressible medium (such as working gas) from another medium space for an incompressible medium (such as hydraulic oil), and includes at least a portion of a magnetostrictive measurement system that continuously determines the corresponding position of the piston within the housing using a displacement measuring device. A rod-shaped guide is fixedly disposed within the accumulator housing, the guide completely passing through the piston at each movable position within the accumulator housing, and the piston is movably movable along the guide. The guide leads to a corresponding stop on one of the two housing covers. A piston with a permanent magnet, which is part of the measurement system, is sealed relative to this guide by means of a sealing device that separates the two medium spaces in a sealed manner. The hollow rod constituting the guide has a preferably pressure-resistant, circular sleeve. The guide of the piston has a waveguide for the magnetostrictive measurement system. The accumulator housing has a piston tube that is closed at both ends by piston covers. The sleeve is fixed to the housing cover with its open end, and a pulse converter with a pulse transmitter / receiver is provided on the piston tube and connected to the waveguide of the magnetostrictive measurement system.

[0007] The magnetostrictive displacement sensors used in this context are, in principle, for measuring the distance between two points. The sensors employed here have a fixed base, a waveguide, a movable permanent magnet, and a transducer that converts mechanical oscillations into electrical signals. The displacement sensor measures the position determined by magnetostriction. Related magnetostrictive sensor systems are described, for example, in EP2556344B1 and EP2549242B1.

[0008] Based on this prior art, the objective of this invention is to improve known solutions in a way that prevents unacceptably high compressive and tensile loads on the bellows body, which serves as a separating device, during equipment operation.

[0009] The relevant task is solved using a device with a monitoring apparatus according to the present invention. Specifically, according to the present invention, a monitoring device is provided for determining the corresponding position of the bellows body within the device housing. This monitoring device has a displacement sensor based on the physical principle of magnetostriction, capable of monitoring without delay the contraction and extension movements of the bellows body within the device housing during operation of the device. This reliably prevents undesirable over-extension and compression of the associated bellows folds along their respective directions of maximum deflection within the range of the bellows body's extension or contraction.

[0010] Because the bellows body, along with its individual bellows folds, experiences different fluid pressures in the two media spaces within the equipment housing during operation, the sensor data from the magnetostrictive displacement sensor can be used, for example, in the case of a media conveying device such as a delivery pump, to at least control the corresponding fluid pressure in the configurable media space, so that the aforementioned overload does not occur on the bellows body. In this respect, undesirable pressure differentials that could have harmful effects on the bellows body can be avoided.

[0011] What has proven particularly advantageous in implementing the device according to this invention is that the magnetostrictive displacement sensor can be integrated into the device housing in such a way that no additional sealing device is required between the relatively movable components of the displacement sensor system, thus preventing the sealing device from failing due to other consequences of leaks. Therefore, there is no corresponding provision in the prior art.

[0012] If the device malfunctions contrary to expectations and consequently the entire hydraulic system connected to it malfunctions, the malfunction can at least be detected in a timely manner by means of a monitoring device, thereby eliminating indirect damage.

[0013] In a preferred embodiment of the device according to this invention, the magnetostrictive displacement sensor has a waveguide in the form of a bottom-closed tube, in which a conductor is housed, and the tube extends from a fixed base at its other free end and toward the bellows body in a manner surrounded by a housing component. This results in a slender monitoring device that can be connected to the device having a partition in a space-saving manner.

[0014] In another preferred embodiment of the device according to this invention, the magnetostrictive displacement sensor further comprises a permanent magnet, which is embedded in the housing component of the waveguide at each retracted or extended position of the bellows body by means of a rod acting on the bellows body, preferably fixedly connected to the bellows body. Thus, continuous measurement can be detected over the entire predetermined range of motion of the bellows body, along with its individual bellows folds.

[0015] In a particularly preferred embodiment of the device according to this invention, the rod is hollowly constructed and carries the permanent magnet at its free end, the permanent magnet annularly surrounding the waveguide tube. Due to the hollow construction of the rod, only minute mass movement occurs during the movement of the bellows body, which helps to improve the quality of the measurement results.

[0016] In another particularly preferred embodiment of the device according to this invention, the hollow rod is guided to reciprocate along the tube in its longitudinal direction in a manner that maintains a seal-free position. Therefore, seals are unnecessary for the operation of the monitoring device, as seals that might otherwise wear out and, particularly when made of elastomeric materials, could cause obstruction during measurement.

[0017] In another preferred embodiment of the device according to this invention, the internal space of the hollow rod for the waveguide and the internal space of the housing component for the waveguide are connected to one of the medium spaces in a manner that continuously guides fluid. This medium space is separated from another medium space in the device housing by means of the bellows body. Due to this connection of the guiding medium, pressure-balanced and unobstructed operation can be achieved during the operation of the device and the monitoring device, thereby preventing distortion of the measurement results.

[0018] In another particularly preferred embodiment of the device according to this invention, the waveguide housing component is preferably fixedly connected to the device housing via a screw-in section as a hollow cylindrical connector, and the free length of the housing component is selected to be greater than the free displacement of the bellows body between its maximum retracted or extended positions within the device housing. This allows for easy separation and reinstallation of the monitoring device from the device housing, enabling simple replacement, for example, if the monitoring device and / or equipment with a separation device malfunction and need to be replaced with new components. The selected structural length also ensures that the bellows body can be accessed in its movement or position in every location it occupies within the device housing.

[0019] In another preferred embodiment of the device according to this invention, the waveguide extends from the housing component at the free end of the tube, preferably for electrically connecting the converter of the magnetostrictive displacement sensor. Thus, the conversion of mechanical oscillations into electrical signals can be located outside the device, which can benefit the quality of measured values.

[0020] In another particularly preferred embodiment of the device according to this invention, the bellows folds of the bellows body are accommodated in an annular space in a fully retracted state, the annular space extending between the closure of the device housing and the cylindrical inner wall of the device housing. Thus, the bellows body, along with its bellows folds, is supported in the fully retracted state to prevent undesirable bending when the folds are stacked outwards and inwards in both directions. This also creates a space in which the bellows folds are stacked or folded in a space-saving manner.

[0021] In another preferred embodiment of the device according to this invention, the device housing, constructed in the form of a hollow cylinder, is provided with another enclosure. The two enclosures of the device housing externally close the device housing, and a single channel for guiding fluid is introduced into the enclosure, the channel leading into one of the configurable medium spaces. Thus, a robust device housing can be constructed, which can also withstand high fluid pressures.

[0022] Furthermore, this invention also relates to the application of a magnetostrictive displacement sensor in the aforementioned device for monitoring a bellows body with individual bellows folds, with the aim of preventing excessive stretching or compression that could damage the material when the bellows folds extend in the direction of their maximum extension or contract in the direction of their maximum contraction. The bellows body, along with its bellows folds, can be designed such that when the bellows body with its closed wall components terminates at opposing stops within the device housing or is compressed in its maximum retracted position, it reaches its maximum extension position, in which the individual bellows folds overlap and abut each other. However, to avoid such material-loaded stop positions, the bellows body can be "moved" by means of a monitoring device so that it does not occupy the relevant stop positions during operation. Attached Figure Description

[0023] The device according to the present invention will now be explained in detail with reference to embodiments. In the schematic and non-total-scale diagrams:

[0024] Figure 1 A longitudinal sectional view of the device as a whole is shown;

[0025] Figure 2 and Figure 3 Views of each end side are shown according to Figure 1 The connection area on the bottom or top side of the device. Detailed Implementation

[0026] According to Figure 1 The diagram shows that the device has a housing 10 with a partition 12 housed therein. The partition 12 has a bellows body 14 with a single bellows pleat 16. Figure 1 The diagram shows the bellows body 16 in its fully retracted position, in which the bellows pleats 16 are compacted, that is, stacked in an overlapping sequence. In the extended state of the bellows body 14, or the bellows, the pleats 16 extend outwards from each other and form a zick-zack bellows (not shown). Such designs are common and will not be discussed further here.

[0027] The bellows body 14, within the equipment housing 10, fluid-tightly separates the two medium spaces 18 and 20, according to... Figure 1 In the bellows position, the medium space 18 occupies its largest position and the medium space 20 occupies its smallest volume.

[0028] The device includes a monitoring unit 22 for determining the corresponding position of the bellows body 14 within the device housing 10. The monitoring unit 22 includes a displacement sensor 24 based on the physical principle of magnetostriction. Thus, the magnetostrictive displacement sensor 24 has a waveguide 26 in the form of a bottom-closed tube 28, within which a conductor (not shown) is housed. The tube 28 extends from its upper free end from a fixed base along a direction... Figure 1 The tube 28 extends in the line of sight and towards the bellows body 14 in a direction surrounded by the shell-shaped housing component 34. The tube 28, which is closed at the bottom and open at the top, may be made of, for example, a nickel-iron alloy, and a copper conductor (not shown) passes through this tube 28. Nickel wire may also be used instead of copper conductor. The patentee provides a suitable magnetostrictive displacement sensor 24 as a linear displacement sensor under the name HLT 2100-R1.

[0029] Furthermore, the magnetostrictive displacement sensor 24 has an annular permanent magnet 36, which is embedded in a hollow cylindrical housing component 34 of the waveguide 26 in each retracted or extended position of the bellows body 14 by means of a rod 38, the rod acting on and preferably fixedly connected to the bellows body 14. The hollow rod 38 carries the annular permanent magnet 36 on its inner side at its free end 40, the permanent magnet surrounding the rod-shaped waveguide 26 in each moving position of the bellows body 14.

[0030] As from Figure 1 As further demonstrated, the hollow rod 38 is not guided by any seal held along the tube 28 in a reciprocating manner in its longitudinal direction. The internal space 42 of the hollow rod 38 and the internal space 44 of the housing component 34 for the waveguide 26 are continuously and pressure-balancedly connected to one of the medium spaces 18, 20, which is separated from the corresponding other medium space 20 in the device housing 10 by means of the bellows body 14. To achieve the relevant medium connection, the hollow rod 38 has at least one fluid guiding section 46 on its bottom side and adjacent to the bellows body 14, which takes the form of a hole through the wall of the hollow rod 38.

[0031] The housing component 34 of waveguide 26, as a hollow cylindrical connector, is fixedly connected to the device housing 10 along the screw-in section 48. The free length of the housing component 34 is coaxial with the longitudinal axis 50 of the device, and is as a whole greater than the free displacement of the bellows body 14 between its maximum retracted and extended positions within the device housing 10; similarly, it is coaxial with the longitudinal axis 50. The linear conductor of waveguide 26 extends from the housing component 34 at the free end 30 above the tube 28, thus forming a connection portion 52 (not shown) for connecting the converter of the magnetostrictive displacement sensor 24.

[0032] To guide the conductor components, the upper end of the outer shell-shaped housing component 34 is tightly sealed by hexagonal screws 54, which also form a fixing part or base 32 for the tube 28. For a tight seal, an annular seal 56 may be provided on the free end of the upper part of the housing component 34.

[0033] The bellows pleats 16 of the bellows body 14 are in the fully retracted state according to... Figure 1 The diagram shows that the bellows body 14 is housed in an annular space 58, which extends between the enclosure 60 of the device housing 10 and the cylindrical inner wall 62 of the device housing. The bellows body 14, with its integrally extending enclosure 64 transverse to the longitudinal axis 50 of the device, has guide strips 66 on its circumferential side, as shown in... Figure 1 As shown, the guide slats have an interruption for guiding the fluid and otherwise guide the bellows body 14 to abut against the inner wall 62 of the equipment housing 10. On the opposite side, the bellows body 14 is fixed to the receiving ring 68 on its bottom side, particularly firmly welded to the receiving ring, and thus fixed within the equipment housing 10. The annular space 58 is connected to the first medium space 18 to guide the medium outward, and in this respect, the annular space 58 is disposed adjacent to the outer side of the bellows 16. The inner side of the bellows pleats 16 is connected to the second medium space 20 to guide the medium inward.

[0034] The bellows body 14's closure plate 64 concentrically supports the receiving sleeve 70 with respect to the longitudinal axis 50, and the lower end of the rod 38 is fitted into the receiving sleeve. The lower end of the rod 38 can be screwed into threads on the inner circumferential side of the receiving sleeve 70. The receiving sleeve 70 is an integral part of the cylindrical closure plate 64, and when the rod 38 is fully inserted into the receiving sleeve 70, the bottom end of the rod 38 is located on the upper side of the closure plate 64. The lower closure body 60, as a solid screw-in body, is screwed flush into the otherwise cylindrical device housing 10, and an annular seal 74 is inserted between the associated screw-in section 72 and the fixedly positioned receiving ring 68 for the bellows body 14, which seals the second medium space 20 relative to the surrounding environment.

[0035] At the free end of the cylindrical device housing 10, another closure portion 76 (similar to the first closure 60) is screwed in along the screw-in section 72 and correspondingly sealed by means of an associated annular seal 78, which now seals the interior of the first media space 18 relative to the surrounding environment. Figure 1 As shown in the diagram, housing component 34 is flush with the upper side of the other closure 76 via shoulder 80. Furthermore, below screw-in section 48, a sealing ring 82 is introduced along the inner circumference of the other closure 76, which seals the connection area between the other closure 76 and housing component 34.

[0036] The housing component 34 tapers in a stepped manner along the direction of the bellows body 14 in the region where it engages with the other closure 76; however, a receiving portion 84, widened in diameter, is provided towards the underside of the other closure 76. The geometry of this receiving portion is such that the outer periphery of the receiving sleeve 70 can be fitted into the widened receiving portion 84 such that at least the upper side of the closing plate 64 abuts against the surrounding stop surface 84 on the underside of the other closure 76. Another annular stop surface 86 is also present on the upper side of the closure 60, which in this respect constitutes a stop, provided that the closing plate 64 is arranged according to… Figure 1 The diagram occupies the lowest position. Between the corresponding annular stop surfaces 84, 86, fluid recesses 88 are introduced at the ends of the corresponding configurable enclosures 60, 76. These fluid recesses are used to improve the filling of the corresponding medium spaces 18, 20, provided that the enclosure plate 64 occupies the stop position on the corresponding enclosure 60, 76 in its fully extended or fully retracted position.

[0037] like Figure 2 As shown, the lower enclosure 60 has four fluid channels 90 diametrically opposed to each other relative to the longitudinal axis 50, which are used to introduce and drain a medium into and from the second medium space 20. The associated channels 90 are arranged as continuous branch channels parallel to the longitudinal axis 50 of the entire device within the enclosure 60. A portion of the channel 90 is used only for introducing fluid and another portion for draining fluid; for this reason, a single channel 90 may also be sufficient for both introducing and draining fluid. Alternatively, the unused fluid channels 90 may be used to introduce sensing devices (not shown) to enable temperature and / or pressure measurements. Furthermore, the cap-like enclosure 60 has two handles 92 diametrically opposed to each other relative to the longitudinal axis 50 on its underside. These handles are used to operate on a tool (not shown in detail) that allows the enclosure 60 to be screwed into and out of the cylindrical device housing 10 via its screw-in section 72.

[0038] exist Figure 3 The other enclosure 76, also flush-screwed into the cylindrical device housing 10, shown in the diagram, has a central fluid channel 94 in addition to the monitoring device 22. This fluid channel is used to introduce and export additional fluid into the first medium space 18 and extends completely through the other enclosure 76 parallel to the longitudinal axis 50. Further channels 96 can be introduced into the enclosure 76 upstream and downstream of the monitoring device 22, preferably for securing sensing devices (not shown in detail). In this regard, the other enclosure 76 also has handles 92 that are diametrically opposed to each other relative to the longitudinal axis 50, the handles being, for example, in the form of a fitting hole for securing a manipulating tool (not shown).

[0039] For example, it can be in Figure 1 The device shown operates within the scope of a conveying or compressing device. If fluid is intermittently introduced and discharged into the medium space 18 via an additional fluid channel 94 by a pump or conveying device (not shown in detail), the fluid in the second medium space 20, for example in the form of a gas such as hydrogen, is compressed within the second medium space 20 by means of a sealing plate 64. For this purpose, the bellows body 14 is moved from its extended position (not shown) according to its position. Figure 1 In the stop position below. Up to this point, the medium in the second medium space 20, such as hydrogen, is then discharged from the device, if necessary, in compressed form, via the fluid channel 90 of the corresponding guide medium. Immediately thereafter, a new cycle begins, in which the first medium space 18 is held pressureless or loaded with negative pressure, thereby closing the plate 64, if necessary, under the pressure of the medium present in the fluid channel 90 below, along the direction... Figure 1 The line of sight moves upward again, and here the bellows body 14, along with its bellows pleats 16, extends out. Then, correspondingly, the first medium space 18 decreases and the second medium space 20 increases, more precisely, to the extent that fluid should be contained in the second medium space 20. Then, a new cycle begins and fluid is discharged from the second medium space 20 in the device.

[0040] The relevant bellows movement is continuously monitored by monitoring device 22, and the corresponding position report and the report on the functionality of the device are transmitted to evaluation electronics (not shown), which is composed of a converter of magnetostrictive displacement measurement sensor 24. However, if according to Figure 1 If the device described herein operates as a conventional bellows-type accumulator throughout the hydraulic system, then the described monitoring device 22 can also be reasonably used.

Claims

1. An apparatus having a monitoring device, the apparatus comprising at least a partition (12) housed within an apparatus housing (10), the partition having a bellows body (14) having a single bellows pleat (16), the bellows body within the apparatus housing (10) fluid-tightly separating two media spaces (18, 20) from each other, characterized in that, A monitoring device (22) is provided for determining the corresponding position of the bellows body (14) in the equipment housing (10). The monitoring device has a displacement sensor (24) based on the physical principle of magnetostriction. The magnetostrictive displacement sensor (24) has a waveguide (26) in the form of a bottom-closed tube (28) in which a conductor is housed. The tube extends from a fixed base (32) with its other free end (30) and extends toward the bellows body (14) in a manner surrounded by the housing component (34).

2. The device according to claim 1, characterized in that, The magnetostrictive displacement sensor (24) also has a permanent magnet (36) which is embedded in the housing component (34) of the waveguide (26) at each retracted or extended position of the bellows body (14) by means of a rod (38) acting on the bellows body (14).

3. The device according to claim 2, characterized in that, The rod (38) is fixedly connected to the bellows body (14).

4. The device according to claim 2, characterized in that, The rod (38) is hollowly constructed and carries the permanent magnet (36) at its free end (40), the permanent magnet annularly surrounding the tube (28) of the waveguide (26).

5. The device according to claim 4, characterized in that, The hollow rod (38) is guided to reciprocate along the longitudinal direction of the tube (28) in a manner that is held without a seal.

6. The device according to claim 5, characterized in that, The hollow rod (38)’s internal space (42) for the waveguide (26) and the housing component (34)’s internal space (44) for the waveguide are connected to one of the medium spaces (18, 20) in a manner that continuously guides fluid, which is separated from the other medium space in the device housing (10) by means of the bellows body (14).

7. The device according to any one of claims 1 to 6, characterized in that, The housing component (34) of the waveguide (26) is fixedly connected to the equipment housing (10) as a hollow cylindrical connector, and the free length of the housing component (34) is selected to be greater than the free displacement of the bellows body (14) between the maximum retracted or extended positions in the equipment housing (10).

8. The device according to claim 7, characterized in that, The housing component (34) of the waveguide (26) is fixedly connected to the device housing (10) via a screw-in section (48).

9. The device according to any one of claims 1 to 6, characterized in that, The waveguide (26) is guided out from the housing component (34) at the free end (30) of the tube (28).

10. The device according to any one of claims 1 to 6, characterized in that, The waveguide (26) extends from the housing component (34) at the free end (30) of the tube (28) for electrically connecting the transducer of the magnetostrictive displacement sensor (24).

11. The device according to any one of claims 1 to 6, characterized in that, The bellows folds (16) of the bellows body (14) are accommodated in an annular space (58) in a fully retracted state, the annular space extending between the enclosure (60) of the equipment housing (10) and the columnar inner wall (62) of the equipment housing.

12. The device according to claim 11, characterized in that, The device housing (10) is provided with an additional enclosure (76), and the enclosure (60) and the additional enclosure (76) of the device housing (10) are constructed in the shape of hollow cylinders to close the device housing outward, and a single channel (90, 94) is introduced into the enclosure (60) and the additional enclosure (76), the channel leading into one of the media spaces (18, 20) that can be configured.

13. The device according to claim 12, characterized in that, The channels (90, 94) are channels for guiding fluid.

Images