Adapter, bladder and test setup for pipe inspection

Abstract

Adapter (2,2a,b) for a bladder (8,8a,b) for pipe inspection, - with a fastening means (4) for sealingly fastening the adapter (2,2a,b) to an inlet opening (10,10a,b) of a shell (50) of the bladder (8,8a,b), - with a connecting means (12) for sealingly connecting a first mouth (16a) of the adapter (2,2a,b) to a pressure line (18) which serves to fill and / or empty the bladder (8,8a,b), - with a first media interface (22a) at a first location (24a) of the adapter (2,2a,b), which is accessible from an external space (26) outside the bladder (8,8a,b) in the assembled state (M) of the adapter (2,2a,b), and - with a second media interface (22b) at a second location (24b) of the adapter (2, 2a, b), which is accessible from an interior space (20) within the bladder (8, 8a, b) in the assembled state (M) of the adapter (2, 2a, b), - with a first channel (28a) leading from the first orifice (16a) to a second orifice (16b), the second orifice (16b) communicating with the interior (20) of the bladder (8, 8a, b) in the assembled state (M), - with a second channel (28b) leading from the first (22a) to the second media interface (22b), - wherein the second channel (28b) and its end-side media interfaces (22a,b) are feedthroughs for a separate media line (32).

Description

[0001] The invention relates to an adapter, a bladder and a test arrangement for pipe inspection.

[0002] Such bladders and test assemblies are used in practice during pipe inspections of pipelines and sewers, especially sewer lines for domestic connections, among other things for leak testing of the relevant elements. A longitudinal section of the pipeline is sealed at both ends by a shut-off or test bladder. The longitudinal section or space between the bladders forms a work or test chamber in which pressure tests, pipe maintenance, etc., are carried out.

[0003] A corresponding bladder and test setup is known, for example, from DE 22 12 330 C3. A so-called packer as a test setup features inflatable end pieces in the form of bladders. One of the end pieces has passages, including for a main line and a branch line. The main line is used to fill and empty the end pieces, and the branch line is used to direct air into the cavity between the inflatable end pieces and the pipe to be tested.

[0004] Shut-off bladders generally only have a single inlet for a filling medium, particularly compressed air, while test bladders generally have additional media feedthroughs, cable feedthroughs, etc. A conventional test setup generally comprises a shut-off bladder and a test bladder. The shut-off bladder forms the end closure of a pipe section to be tested, away from supply lines, etc. It only has one connection through which it can be pressurised, so that it fits tightly against the pipe. The test bladder, on the other hand, has a feedthrough for the pressure supply to the shut-off bladder and for its own pressure supply, as well as, for example, a channel for introducing compressed air into the test section of the pipe, and is therefore more complex.Test bladders known from practice each have a fairly wide (rigid) flange at the end, which results from the fact that the actual (expandable) rubber section of the test bladder has a fairly large outer diameter when deflated.

[0005] US Pat. No. 6,901,966 B2 discloses a sealing device formed from a plurality of sealing tubes. After a connected-tube body having base elements arranged at a front end and a rear end is inserted into a fluid passage like a tubular element, the sealing tubes are expanded by injecting nitrogen gas into each of the sealing tubes. The intermediate portions of the sealing tubes along a longitudinal direction are press-fitted to the inner surface of the fluid passage over their entire circumference, thereby sealing the fluid passage.Since the connected tube body can be easily bent near a connecting base member between the tubes, the connected tube body can be easily curved along the fluid passage, thereby facilitating an operation for inserting the connected tube body into the fluid passage and also improving a sealing property with respect to the fluid passage.

[0006] From the patent US 3,870,085 an expandable plug for a sewer pipe is known, which includes a cylindrical expandable element, the ends of which are fixed between discs arranged to allow the introduction of air or gas into and through the expandable plugs in order to hold them in position and also to create pressure.

[0007] The object of the present invention is to improve a bladder or test arrangement.

[0008] This object is achieved by an adapter for a bladder according to claim 1, wherein the bladder serves for pipe inspection. Preferred or advantageous embodiments of the invention, as well as other categories of invention, are evident from the further claims, the following description, and the accompanying figures.

[0009] The adapter contains a fastening means for sealingly attaching the adapter to an inlet opening of the bladder. The adapter also contains a connection means for sealingly connecting a first opening of the adapter to a pressure line. The pressure line in turn is used to fill and / or empty the bladder. A pressure line is therefore connected to the adapter via the connection means in such a way that it communicates with the first opening in a pressure-tight manner with respect to the environment. This allows a pressure medium to enter the bladder through the first opening. Pressure media are in particular gases or fluids, in particular air. The adapter contains a first media interface. This is located at a first location on the adapter. When the adapter is assembled, the first location is accessible from an external space outside the bladder. The adapter contains a second media interface. This is located at a second location on the adapter.The second location is accessible from an interior space within the bladder when the adapter is assembled. This assembly state refers to the state when the adapter is tightly secured to the bladder's inlet opening or to the shell using the fastener. This prevents pressure from escaping between the shell and the adapter when filled.

[0010] The adapter contains a first channel. The first channel leads from the first opening to a second opening. When the adapter is assembled, the second opening communicates with the interior of the bladder. The second opening is located specifically on the fastening element. When the adapter is assembled, the first channel thus forms a connection from the exterior of the bladder (first opening) to the interior of the bladder (second opening).

[0011] The adapter has a second channel that leads from the first to the second media interface. The invention is explained here for a single pair of media interfaces connected via a single second channel. However, within the scope of the invention, the concept can also be extended to other media interfaces or pairs of media interfaces and / or other second channels.

[0012] The adapter can be attached directly to the bladder using the fastening device, but can also be connected with an intermediate piece, e.g. for mechanical extension or diameter adjustment for threads, etc. The same applies to the connecting device, the first outlet, the pressure line, the media interfaces and channels, etc.

[0013] Within the scope of the invention, the term "bubble" is used to represent all bubble types usable in pipe inspection, in particular both "test bubbles" and "shut-off bubbles," as explained above. The invention therefore applies to all bubble types. Within the scope of the invention, "pipe inspection" refers to both the actual inspection, e.g., pressure testing using compressed air, camera inspection, etc., as well as pipe processing, e.g., pipe rehabilitation, etc., e.g., the introduction of a reactive medium between the two bubbles to close cracks or holes in pipe walls.

[0014] The invention is based on the following considerations and findings: The invention is based on the idea of ​​connecting an adapter to the shell of a conventional shut-off bladder. The adapter enables both the supply of pressure to the bladder itself and the creation of further access to the interior of the bladder through a media interface or a corresponding channel. In this way, a media line can be fed into the interior of the bladder. Media lines in the sense of the present invention include gaseous and liquid media such as air or oil, but also the transport of media such as electrical current or light, so that the media line can also be a power line or fiber optic cable, and so on. By using another adapter on the bladder, in particular at the opposite end of the bladder, the media line can be led out of the bladder again there. In addition, the supply and transmission of filling pressure for the bladder can take place separately. For example,the media line is led through the test bladder to the test chamber and at the same time the test bladder is supplied with setup pressure and the setup pressure for the shut-off bladder is passed through.

[0015] The invention is further based on the idea of ​​creating an attachable and removable adapter for leak testing of ducts and pipelines.

[0016] The invention makes it possible to convert or upgrade conventional shut-off bladders and short rehabilitation packers to test bladders thanks to the adapter, in particular to make them suitable for the passage of media lines.

[0017] When using multidimensional shut-off bladders – these have a small cross-section when empty and a large expansion volume when filled, for example, dimensions of 50 - 150 millimeters in diameter – and the adapter, bladders are created that have a comparatively small diameter when empty, are expandable over a wide diameter range, and allow media to pass through. This makes leak tests possible with a wide range of diameter adjustments. Furthermore, for example, test procedures can be introduced into branched drainage systems with multiple dimensional jumps in the smallest dimension in order to test the largest dimension for leaks section by section or selectively. This greatly simplifies work in the sewer rehabilitation sector.

[0018] In a preferred embodiment, the first and second channels coincide over at least one longitudinal section. In particular, the longitudinal section extends as far as the second orifice. In other words, the second channel opens into the first channel inside the adapter, so that the second orifice and second media interface coincide, but the first media interface and first orifice remain separate from one another. In the assembled state, there is then only a single opening towards the interior of the bladder or shell, which represents both the second orifice and the second media interface and is available for the first and second channels. Outside the bladder or shell, both channels still lead to separate openings (orifice / media interface). In the assembled state, a separate connection for the media line and pressure line can therefore be made outside the bladder.The two channels are introduced into the interior of the bladder in a space-saving manner.

[0019] In a first alternative, the media interface can be a connection for a media line, with the media line coming from the outside of the bladder ending at the adapter. The medium then comes into direct contact with the second channel. The media line thus ends at the media interface.

[0020] According to the invention, as an alternative to this, the second channel and its end-side media interfaces are feedthroughs for a media line. The media line has - at least in the region of the bladder feedthrough - a closed shell within which medium can be transported. In particular, at least one of the feedthroughs, i.e. the second channel or one of the end-side media interfaces, contains at least one sealant. The sealant serves to seal the media line or its outer surface against the adapter or against the media interface or the second channel. As an alternative to the above, a "separate" media line is fed through the adapter. The sealant can be, for example, an adhesive, filling or foaming, but can also be a precisely fitting insertion of the media line into the media interface or the second channel, so that the media line lies directly in the adapter and seals.

[0021] Passing a sealed media line through the adapter offers the advantage of preventing contact between the media line and the adapter or the interior of the bladder when the media line passes through the entire bladder and exits at its opposite ends. The sealant ensures a seal between the interior of the bladder and the exterior during assembly, preventing internal pressure from escaping from the filled bladder when filled.

[0022] In a preferred variant of this embodiment, at least one of the sealing means is a circular ring seal for a media line with a circular outer cross-section. In particular, the sealing means is an O-ring. Accordingly, circular seals can be designed particularly simply and particularly tightly.

[0023] In a preferred embodiment, the fastening means comprises a nozzle or a receptacle. The nozzle or the receptacle also comprises a locking means for sealingly attaching it to a counterpart of the bladder. The locking means is, for example, an internal or external thread, part of a bayonet lock or a coupling, etc. The locking means can - as explained above - also engage directly with the bladder or with an intermediate piece which is in turn connected to the bladder. The nozzle is, for example, a cylindrical threaded nozzle which, when assembled, passes through the inlet opening of the bladder. Alternatively, the receptacle is, for example, a cylindrical opening or a cylindrical end of the first channel, for example a bore with an internal thread or a cup-shaped receptacle of a quick-action coupling.A corresponding counterpart of the bladder, such as a threaded connector or a coupling connector, can then be inserted into this. This allows for standard sealing fastening methods between the adapter and the bladder.

[0024] In a preferred embodiment, the fastening means has a nozzle, as described in particular above. The second opening is then located on the nozzle, in particular on an end face of the nozzle. The end face is located in the interior of the bladder or points towards it, in particular in the assembled state. In particular, the second media interface is also located on the nozzle, in particular likewise on the end face. In particular, in the assembled state, at least part of the fastening means protrudes as a nozzle through the inlet opening into the bladder, with the second opening and the second media interface being located on the front end face of the nozzle. This results in a structurally particularly advantageous embodiment.

[0025] In an alternative embodiment, the fastening means comprises a receptacle, wherein the second opening is located on the receptacle, in particular on a base of the receptacle. In particular, the second media interface is also located on the receptacle, in particular on the base of the receptacle. In the assembled state, the base communicates with the interior of the bladder. This results in a particularly advantageous design.

[0026] In a preferred embodiment, the connecting means comprises a nozzle or a receptacle. The nozzle or the receptacle contains a locking means for sealingly attaching it to a counterpart of the pressure line. The locking means is, for example, an internal or external thread, part of a bayonet lock or a coupling, etc. The locking means can - as explained above - also engage directly with the pressure line or with an intermediate piece, which in turn is connected to the pressure line. The nozzle is, for example, a cylindrical threaded nozzle, which can be inserted into a corresponding receptacle in the pressure line. Alternatively, the receptacle is, for example, a cylindrical opening or a cylindrical end of the first channel, for example a bore with an internal thread or a cup-shaped receptacle of a quick-action coupling.A corresponding counterpart of the pressure line, such as a threaded connector or a coupling connector, can then be inserted into this. This allows for standard sealing fastening methods between the adapter and the pressure line.

[0027] In a preferred embodiment, the connecting means comprises a nozzle, as described above in particular. The first opening is located on the nozzle, in particular on a front side of the nozzle. In the case of a connected pressure line, for example, the front side is located inside the latter. In particular, at least a portion of the fastening means thus protrudes as a nozzle into the interior of a connected pressure line, with the first opening located on the front end of the nozzle. This results in a particularly advantageous design.

[0028] In an alternative embodiment, the connecting means comprises a receptacle, wherein the first opening is located on the receptacle, in particular on a base of the receptacle. In the case of a connected pressure line, the base is in communication with the interior of the line. This results in a particularly advantageous design.

[0029] In a preferred variant of the aforementioned embodiments, the locking means contains an internal or external thread, in particular a 1 / 4" thread, in particular according to DIN2999 or ISO228. Such threads are common for sewer inspection and rehabilitation, which is why the adapter can be integrated into existing tool or accessory ranges.

[0030] In a preferred embodiment, the connecting means and the first media interface each have a central longitudinal axis. The central longitudinal axes are inclined relative to each other, in particular at an angle of 15°-75°, in particular at an angle of 20°-30°, in particular at 25°. These angles are particularly advantageous for sewer inspection, allowing the media line to be routed parallel to a pressure line, but with as little bending as possible at the adapter.

[0031] The object of the invention is also achieved by a bladder for pipe inspection according to claim 13, comprising an expandable sleeve. The sleeve has at least two inlet openings. One inlet opening is arranged at each of the opposite longitudinal ends of the bladder or sleeve. The bladder has at least one adapter according to the invention, which is in the aforementioned assembled state, i.e., which is sealingly attached by its fastening means directly or indirectly to one of the inlet openings of the sleeve.

[0032] The bladder and its embodiments as well as the respective advantages have already been explained in connection with the adapter according to the invention.

[0033] In a preferred embodiment, the bladder has at least two adapters according to the invention, which are sealingly attached to a respective one of the inlet openings by means of their respective fastening means. A media line is guided from the first media interface of a first of the adapters to the first media interface of a second of the adapters. The media line passes through the respective second channels. The media line runs between the respective second media interfaces of the adapters in the interior of the bladder or shell. According to the invention, the bladder is therefore equipped with two adapters according to the invention, wherein the media line belonging to the bladder in this case is guided through the bladder by means of the adapter.

[0034] The object of the invention is also achieved by a test arrangement for pipe inspection according to claim 15. The test arrangement has at least two bladders, wherein a first of the bladders has at least one inlet opening. A second of the bladders is a bladder according to the invention. The connecting means of a first adapter of the second bladder is connected to the inlet opening of the first bladder via a pressure line. The connecting means of a second adapter of the second bladder is connected to a pressure source for filling and / or emptying the bladders. By applying pressure from the pressure source, both bladders can thus be inflated equally. The second bladder has the above-mentioned feedthrough for the media line. With the test arrangement according to the invention, it is possible both to block off an area in a pipe arrangement located between the bladders and to introduce a media line into the area between the two bladders.In particular, this makes it possible to supply or discharge medium via the media line into or from the corresponding area between the bubbles.

[0035] The test arrangement and its embodiments as well as the respective advantages have already been explained in connection with the bladder according to the invention or the adapter according to the invention.

[0036] In a preferred embodiment, the second of the bladders is a bladder mentioned above in the embodiment with two adapters and a media line. The media line leading from the first media interface of the first adapter terminates in an area between the first and second bladders for introducing or removing media. The media line leading from the first media interface of the second adapter is connected to a media source for introducing or removing the media into or from the area. Thus, a complete testing and work arrangement is available for performing a wide variety of testing and work tasks for pipe inspection.

[0037] Embodiments of the invention, also in combination with the above-mentioned embodiments, possibly also embodiments not previously mentioned, are summarized as follows: According to the invention, a bladder is described in particular that is universally suitable for the passage of any media line. The necessary fits or seals are provided at appropriate locations to make channels, gaps, openings, etc. leading from the interior of the bladder sufficiently pressure-tight to allow the bladder to be pressurized or inflated as desired.

[0038] Further features, effects, and advantages of the invention will become apparent from the following description of a preferred embodiment of the invention and the accompanying figures. Corresponding or identical parts are provided with the same reference numerals in the figures. In a schematic diagram, the following is shown: Fig. 1 an adapter according to the invention, Fig. 2 a bladder according to the invention, Fig. 3 a test arrangement according to the invention.

[0039] Fig. 1 shows an adapter 2 with a fastening means 4, here with a cylindrical nozzle 6. The fastening means 4 serves to fasten the adapter 2 to a shell 50 of a bladder 8, or rather, its inlet opening 10. The adapter 2 also has a connecting means 12, here with a receptacle 14 in the form of a cylindrical bore. The connecting means 12 has a first opening 16a and serves to connect the adapter 2 or the first opening 16 to a pressure line 18, indicated only symbolically. The pressure line 18 serves to fill and / or empty the bladder 8 or the interior 20 of the bladder 8.

[0040] The adapter has a first media interface 22a at a first location 24a of the adapter 2. In Fig. In the assembled state M of the adapter 2 shown in FIG. 1, when it is sealingly attached to the shell 50, the first location 24a is accessible from the exterior 26 of the bladder 8. The adapter 2 also has a second media interface 22b at a second location 24b. The second media interface 22b is accessible from the interior 20 of the bladder 8 in the assembled state M.

[0041] A first channel 28a of the adapter 2 leads from the first opening 16a through the adapter 2 to a second opening 16b, which in the assembled state M communicates with the interior 20 of the bladder 8. A second channel 28b, which in Fig. 1 is partially shown only in dashed lines, leads from the first media interface 22a to a second media interface 22b. In the embodiment according to Fig. 1, the first channel 28a and the second channel 28b fall on a longitudinal section 30, in Fig. 1, indicated by dashed lines. In this case, the longitudinal section 30 extends to the second opening 16b or the second media interface 22b.

[0042] The second channel 28b and its end-side media interfaces 22a, b are in Fig. 1 are designed as feedthroughs for a media line 32 (only indicated). Contained in the channel 28b as one of the feedthroughs is a sealant 34 for sealing the media line 32 against the adapter 2. In the example, the sealant 34 is a circular ring seal for the media line 32 with a circular outer cross-section, namely an O-ring.

[0043] The fastening means 4, here the nozzle 6, has a locking means 36b, here an external thread, which serves for sealing attachment to a counterpart 38b, here an internal thread of the bladder 8, which is attached to the sleeve 50. The second opening 16b is located on the nozzle 6 or on its end face 40. The second media interface 16b is also located on the nozzle 6 or on its end face 40.

[0044] The connecting means 12 has a receptacle 14, in this case a cylindrical bore, in which a locking means 36a, in this case an internal thread, is mounted. This serves for sealing attachment to a counterpart 38a, in this case an external thread of the pressure line 18.

[0045] The first opening 16a is located on the receptacle 14, or in this case, on the base 42 of the receptacle. The base here is an imaginary surface where the receptacle opens into the first channel 28a. The threads are quarter-inch threads according to DIN 2999 or ISO 228.

[0046] The connection means 12 and the first media interface 22a each have a central longitudinal axis 44, 46 which are inclined relative to each other, in the example by an angle A of 25°.

[0047] Fig. Figure 2 shows an entire bladder 8 for pipe inspection, with its expandable sleeve 50, which has two inlet openings 10a, b at the two opposite longitudinal ends of the sleeve 50 or bladder 8. The bladder 8 has two adapters according to the invention, which are sealingly attached to the respective inlet openings 10a, b with their respective fastening means 4. In the example according to Fig. 2, the first channel 28a and the second channel 28b do not coincide. Therefore, the respective second openings 16b and the media interfaces 22b do not coincide either. Furthermore, the adapters 2 according to Fig. 2 have respective fastening means 4 that contain receptacles 14. The respective locking means 36b on the receptacles 14 are internal threads, while the counterparts 38b of the bladder 8 or sleeve 50 are external threads. The second openings 16b and the second media interfaces 22b are located on the respective base 42 of the receptacles 14. The respective connecting means 12, on the other hand, contain nozzles 6 that contain corresponding locking means 36a as parts of a quick-action coupling (not shown in detail). The counterparts 38a are the matching counterparts of the quick-action couplings. The respective first openings 16a are each located on the end faces 40 of the nozzles 6.

[0048] The Fig. 2, the media line 32 merely indicated here is an electrical connecting cable. This leads from the first media interface 22a of a first adapter 2a to the first media interface 22a of the second adapter 2b and runs in the second channels 28b. Between the respective second media interfaces 22b of the adapters 2a,b, the media line 32 is guided in the interior 20 of the casing 50. The sealing agent 34 is in Fig. 2 a merely indicated pressure-tight bonding of the media line 32 in the second channel 28b or at the second media interface 22b.

[0049] Fig. 3 shows a test arrangement 60 for pipe inspection in a corresponding pipeline 62. The test arrangement 60 contains two bladders 8a, b, wherein a first bladder 8a has an inlet opening 10a. A second bladder 8b is a bladder according to the invention. The connection means 12 of the first adapter 2a of the second bladder 8b is connected to the inlet opening 10a of the first bladder 8a via a pressure line 18. The connection means 12 of the second adapter 2b of the second bladder 8b is connected to a pressure source 64 via a pressure line 18. The pressure source 64 serves, by means of the pressure lines 18, to fill and / or empty the bladders 8a, b or their respective interior spaces 20. The media line 32 in the example is a compressed air line, indicated only symbolically.The media line 32 leading from the first media connection 22a of the first adapter 2a ends in an area 66 between the first and second bladders 8a,b, in order to be able to introduce or remove medium, in this case compressed air. The media line 32 leading from the first media connection 22a of the second adapter 2b is connected to a media source 68. The media source 68 provides the medium, among other things, and serves to introduce and remove the medium into or from the area 66. The inflated bladders 8a,b, which lie tightly against the inner wall of the pipe 62, separate the area 66 from the rest of the pipe 62 in a pressure-tight manner, in order to be able to carry out pressure measurements in it, for example.

[0050] Fig. 4 shows again an adapter 2 in different views a)-d), whereby the views b)-d) in Fig. 1a) are indicated by arrows labeled BD. View a) is a partial lateral section, view b) a top view, view c) a front view, and view d) a perspective view. The embodiment of the Fig. 4 corresponds essentially to the embodiment according to Fig. 1. The connection between the connecting means 12 and the pressure line 18 is not made directly, but rather through the interposition of an adapter in the form of a quick-action coupling (not explained in detail). The socket 72 of the quick-action coupling is screwed sealingly into the locking means 36a in the form of a thread with its counterpart 38a in the form of a counter-thread. Fig. 4a) The plug 74 of the quick-release coupling, only indicated in FIG. 1, is attached to the pressure line 18. This design allows for particularly quick and easy connection and disconnection of bladder 8 with socket 72 from the pressure line 18 with plug 74.

[0051] In the front view according to Fig. 4b shows an automatic closure within the socket 72, which is not explained in detail and closes the access to the first opening 16a when no plug 74 is inserted. List of reference symbols 2,2a,b adapters 4 fasteners 6 nozzles 8.8a.b Bladder 10,10a,b Inlet openings 12 connecting elements 14 recording 16a first mouth 16b second mouth 18 pressure line 20 Interior 22a first media interface 22b second media interface 24a first place 24b second place 26 Outdoor space 28a first channel 28b second channel 30 Longitudinal section 32 Media Management 34 Sealants 36a, b locking device 38a,b counterparts 40 front side 42 Floor 44 Central longitudinal axis 46 Central longitudinal axis 50 covers 60 test arrangement 62 pipeline 64 Pressure source 66 Area 68 Media source 70 adapters 72 socket 74 plugs M Assembly state A angle

Claims

[1] Adapter (2,2a,b) for a bladder (8,8a,b) for pipe inspection, - with a fastening means (4) for sealingly fastening the adapter (2,2a,b) to an inlet opening (10,10a,b) of a shell (50) of the bladder (8,8a,b), - with a connecting means (12) for sealingly connecting a first mouth (16a) of the adapter (2,2a,b) to a pressure line (18) which serves to fill and / or empty the bladder (8,8a,b), - with a first media interface (22a) at a first location (24a) of the adapter (2,2a,b), which is accessible from an external space (26) outside the bladder (8,8a,b) in the assembled state (M) of the adapter (2,2a,b), and - with a second media interface (22b) at a second location (24b) of the adapter (2, 2a, b), which is accessible from an interior space (20) within the bladder (8, 8a, b) in the assembled state (M) of the adapter (2, 2a, b), - with a first channel (28a) leading from the first orifice (16a) to a second orifice (16b), the second orifice (16b) communicating with the interior (20) of the bladder (8, 8a, b) in the assembled state (M), - with a second channel (28b) leading from the first (22a) to the second media interface (22b), - wherein the second channel (28b) and its end-side media interfaces (22a,b) are feedthroughs for a separate media line (32). [2] Adapter (2,2a,b) according to claim 1, characterized by that the first (28a) and the second channel (28b) coincide at least over a longitudinal section (30). [3] Adapter (2,2a,b) according to one of the preceding claims, characterized bythat in at least one of the passages for the media line (32) formed by the second channel (28b) and its end-side media interfaces (22a,b) at least one sealing means (34) for sealing the media line (32) with respect to the adapter (2,2a,b) is contained. [4] Adapter (2,2a,b) according to claim 3, characterized by that at least one of the sealing means (34) is a circular ring seal for a media line (32) with a circular outer cross-section. [5] Adapter (2,2a,b) according to one of the preceding claims, characterized by that the fastening means (4) has a nozzle (6) or a receptacle (14) with a locking means (36b) for sealingly fastening to a counterpart (38b) of the bladder (8,8a,b). [6] Adapter (2,2a,b) according to one of claims 1 to 5, characterized by that the fastening means (4) has a nozzle (6), wherein the second mouth (16b) is located on the nozzle (6). [7] Adapter (2,2a,b) according to one of claims 1 to 5, characterized by that the fastening means (4) has a receptacle (14), wherein the second mouth (16b) is located on the receptacle (14). [8] Adapter (2,2a,b) according to one of the preceding claims, characterized by that the connecting means (12) has a nozzle (6) or a receptacle (14) with a locking means (36a) for sealing attachment to a counterpart (38a) of the pressure line (18). [9] Adapter (2,2a,b) according to one of claims 1 to 8, characterized by that the connecting means (12) has a nozzle (6), wherein the first mouth (16a) is located on the nozzle (6). [10] Adapter (2,2a,b) according to one of claims 1 to 8, characterized by that the connecting means (12) has a receptacle (14), wherein the first mouth (16a) is located on the receptacle (14). [11] Adapter (2,2a,b) according to one of claims 5 or 8, characterized bythat the locking means (36a,b) contains an internal or external thread. [12] Adapter (2,2a,b) according to one of the preceding claims, characterized by that the connecting means (12) and the first media interface (22a) each have a central longitudinal axis (44,46), and the central longitudinal axes (44,46) are inclined relative to one another. [13] Bladder (8,8a,b) for pipe inspection, comprising an expandable shell (50) having at least two inlet openings (10,10a,b) at respective opposite longitudinal ends, characterized by that the bladder (8,8a,b) has at least one adapter (2,2a,b) according to one of claims 1 to 12, which is sealingly fastened to one of the inlet openings (10,10a,b) by its fastening means (4). [14] Bladder (8,8a,b) according to claim 13, characterized bythat at least two adapters (2, 2a, b) according to one of claims 1 to 12 are sealingly fastened with their respective fastening means (4) to a respective one of the inlet openings (10, 10a, b) and a media line (32) is guided from the first media interface (22a) of a first of the adapters (2a) to the first media interface (22a) of a second of the adapters (2b), said media line passing through the respective second channels (28b) and running between the respective second media interfaces (22b) of the adapters (2, 2a, b) in the interior (20) of the bladder (8, 8a, b). [15] Test arrangement (60) for pipe inspection, with at least two bubbles (8, 8a, b), wherein a first of the bubbles (8a) has at least one inlet opening (10, 10a, b), characterized by , that - a second of the bladders (8b) is a bladder according to one of claims 13 to 14, and - the connecting means of a first of the adapters (2a) of the second bladder (8b) is connected to the inlet opening (10, 10a, b) of the first bladder (8a) via a pressure line (18), and - the connecting means (12) of a second of the adapters (2b) of the second bladder (8b) is connected via a pressure line (18) to a pressure source (64) for filling and / or emptying the bladders (8, 8a, b), [16] Test arrangement (60) according to claim 15, characterized by , that - the second bladder (8b) is a bladder according to claim 14, and - the media line (32) leading from the first media interface (22a) of the first adapter (2a) ends in a region (66) between the first (8a) and second bladder (8b) in order to introduce or remove medium there, and - the media line (32) leading from the first media interface (22a) of the second adapter (2b) is connected to a media source (68) for introducing or removing the medium into or from the area (66).

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