Plug connector

Abstract

The invention relates to a plug connector (1) for releasably connecting a first fluid line (2a) to a second fluid line (2b) by means of an insertion sleeve (3), wherein the plug connector (1) has a displacement sleeve (5), which can be displaced between a parked position (PP), in which a locking mechanism has been deactivated, and a locking position (VP), in which the locking mechanism has been activated, wherein the locking mechanism comprises a triggering spring (6) with an actuating portion (7) and a retaining portion (8), wherein, in the parked position (PP) of the displacement sleeve (5), the triggering spring (6) has been biased into a retaining position (HP), in which the retaining portion (8) has been latched in on a retaining protrusion (9) of the inner sleeve (4), wherein, in the retaining position (HP), the actuating portion (7) projects radially inwards, through an actuating opening (10) provided in the inner sleeve (4), into the receiving space (AR) of the inner sleeve (4), wherein, when the insertion sleeve (3) is being introduced into the receiving space (AR) of the inner sleeve (4), the actuating portion (7) of the triggering spring (6) can be displaced radially out of the receiving space (AR) by the insertion sleeve (3), as a result of which the retaining portion (8) can be released from the retaining protrusion (9) of the inner sleeve (4) and the triggering spring (6) acts on the displacement sleeve (5) by way of a triggering force (FA), by means of which the displacement sleeve (5) can be shifted from the parked position (PP) into the locking position (VP), and wherein there is provided on the displacement sleeve (5) a first guiding device (14), which is configured such that, when the displacement sleeve (5) is being moved from the parked position (PP) into the locking position (VP), the locking element (12) is subjected to a first guiding force (FEI), by means of which the locking element (12) can be shifted from the disengaged position (FS) into the arresting position (SS).

Description

[0001] CONNECTORS

[0002] The invention relates to a connector for detachably connecting a first fluid line to a second fluid line by means of an insertion sleeve, an assembly comprising such a connector and a use of the connector for connecting a first fluid line to a second fluid line.

[0003] Generic connectors are used in a wide variety of industrial sectors to connect two fluid lines, preferably in a sealed manner. This is usually done as part of the assembly process of a specific fluid-carrying product. Depending on the specific application and the fluid used, the fluid lines can be essentially rigid pipes or flexible hoses. However, a fluid line can also be integrated into a component. The fluids used can be gaseous or liquid media. Gaseous media can be, for example, (compressed) air or certain process gases. Liquid media used can include, for example, water, lubricating oil, coolant, refrigerant, etc.

[0004] During the assembly process of a product, it may be necessary, for example, to connect an initial fluid line or fluid connection of a component to be assembled with a corresponding fluid line or fluid connection of the existing product. To avoid later leaks, it is essential that the connection is made correctly and with a high degree of reliability. Due to increasingly efficient production processes, the throughput time in the assembly process is generally also shortened. This means that less and less time is available for the individual assembly steps. In addition to high reliability, a quick connection of the fluid lines using the connector is therefore also desired. As a rule, one side of the connector is connected directly to one of the two fluid lines and the other fluid line is first connected with an insert sleeve.To connect the two cables, the insertion sleeve is finally coupled to the connector, usually in a detachable manner.

[0005] Various connectors are known from WO 2018 / 144902 A1, WO 2018 / 102213 A1, and EP 3 179 148 A1. The connectors known from these documents have the disadvantage that the connection may be faulty or that it is not possible to clearly determine whether the connectors are correctly mated. The object of the present invention was to overcome the disadvantages of the prior art and to provide a connector that enables a reliable and rapid connection between the connector and the insertion sleeve.

[0006] This object is achieved with a connector according to claim 1. The connector according to the invention enables the insertion sleeve, as soon as it is in the intended coupling position, to be automatically and reliably locked to the inner sleeve in a form-fitting manner through the interaction of the release spring with the sliding sleeve and the locking element. The first guide device achieves positive guidance of the locking element, thereby ensuring reliable displacement of the locking element between the locked position and the released position.

[0007] Preferably, the sliding sleeve can be manually displaced from the locking position back into the parking position, preferably by means of a gripping section provided on the outer circumferential surface, whereby a compression force counteracting the triggering force can be transmitted to the trigger spring, whereby the holding section can be brought back into the holding position. The first guide device of the sliding sleeve is designed such that when the sliding sleeve moves from the locking position into the parking position, a second guide force acts on the locking element, by which the locking element can be displaced from the locked position into the release position. This allows the locking to be deactivated again in a simple manner, whereby the positive guide ensures reliable unlocking.

[0008] In the region of the holding section, the release spring can have a restoring force directed inwards in the radial direction of the inner sleeve, by means of which the holding section engages the holding projection when the holding position is reached. Alternatively or additionally, a restoring projection can be provided on the inner circumferential surface of the sliding sleeve, which is designed to exert a restoring force directed inwards in the radial direction of the inner sleeve on the release spring when the sliding sleeve moves from the locking position to the parking position, by means of which the holding section of the release spring engages the holding projection when the holding position is reached. This facilitates the engagement of the release spring in the holding position. The restoring projection preferably has an inclined restoring surface facing the first end of the sliding sleeve.The release spring preferably has a spring wire with a first free wire end, a second free wire end and an intermediate one in the central section, wherein the central section bears at least partially against the outer circumferential surface of the inner sleeve and extends in the circumferential direction preferably over an angle of at least 30°, preferably at least 45°, particularly preferably at least 60°, in particular at least 90°. The central section can be substantially S-shaped or V-shaped. In the region of the first free wire end, a fastening section can be provided which can be fastened to a fastening receptacle arranged in the region of the first axial inner sleeve end on the outer circumferential surface of the inner sleeve, wherein the holding section can be provided in the region of the second free wire end.This creates a structurally simple release spring which is accommodated in the radial direction in a space between the sliding sleeve and the inner sleeve.

[0009] The locking recess is preferably designed as a circumferential groove and extends in the circumferential direction of the inner sleeve over a groove angle of at least 30°, preferably at least 60°, particularly preferably at least 90°. The circumferential groove particularly preferably lies in a plane that is normal to the longitudinal axis of the inner sleeve. An axial position of the locking recess on the inner sleeve is preferably determined as a function of an axial position of the engagement opening of the insertion sleeve and / or an axial position of the actuation opening on the inner sleeve is preferably determined as a function of an axial position of a conical section of the insertion sleeve. This allows the locking mechanism to be adapted to a standardized insertion sleeve, in particular an insertion sleeve according to the VDA standard.

[0010] The first guide device of the sliding sleeve preferably comprises a first guide slot and a second guide slot, which are arranged spaced apart from one another in the circumferential direction of the sliding sleeve on the inner circumferential surface of the sliding sleeve. The locking element preferably comprises a rod with a first free rod end and an opposite second free rod end, wherein a first guide section is provided in the region of the first rod end, which is positively guided in the first guide slot, and a second guide section is provided in the region of the second rod end, which is positively guided in the second guide slot, and wherein the locking section is located between the free rod ends. This embodiment allows reliable guidance of the locking element on both sides and stable locking.It is advantageous if the locking mechanism comprises at least two identical locking mechanisms arranged on the connector with respect to a longitudinal axis of the inner sleeve, preferably diametrically opposite each other. This improves the locking effect. The at least two identical locking mechanisms can be actuated simultaneously.

[0011] It is advantageous if the connecting section of the first axial inner sleeve end comprises a number of latching recesses that are designed to interact with a number of corresponding latching projections provided on the first fluid line in order to form a positive connection in the axial direction and / or in the circumferential direction. Alternatively or additionally, the connecting section of the first axial inner sleeve end can comprise a number of latching projections that are designed to interact with a number of corresponding latching recesses provided on the first fluid line in order to form a positive connection in the axial direction and / or in the circumferential direction. This enables a stable, detachable connection to the first fluid line. The latching recesses or latching projections can, for example, be formed integrally with the inner sleeve and, for example,during the production of the inner sleeve. This enables simple and cost-effective production.

[0012] Preferably, a second guide device is provided for axially guiding the sliding sleeve along the inner sleeve, wherein the second guide device preferably comprises at least one first guide projection and at least one second guide projection, which are arranged spaced apart from one another in the circumferential direction on the outer circumferential surface of the inner sleeve and comprises a guide web which is provided on the inner circumferential surface of the sliding sleeve and extends in the axial direction at least over part of a length of the sliding sleeve, wherein the guide web is guided in the circumferential direction between the first guide projection and the second guide projection. This enables stable and reliable guidance of the sliding sleeve along the inner sleeve. The guide projections can again be formed integrally with the inner sleeve and can again be produced directly during the manufacture of the inner sleeve.Preferably, the guide web is formed integrally with the reset projection. It is advantageous if a number of positioning recesses are provided on the inner sleeve, each extending from the second axial inner sleeve end over a portion of the inner sleeve in the direction of the first axial inner sleeve end and each connecting the inner circumferential surface to the outer circumferential surface of the inner sleeve, wherein the number of positioning recesses are designed to interact with a number of corresponding positioning projections provided on the insert sleeve in order to position the insert sleeve in the coupling position in the circumferential direction relative to the inner sleeve. This enables simple positioning of the insert sleeve relative to the inner sleeve, whereby the coupling position can be reached quickly and easily.

[0013] The plug connector preferably has an indicator device to show a user whether the sliding sleeve is in the locking position and the locking element is in the blocking position. The indicator device can comprise a number of signal tabs that are arranged at the first axial inner sleeve end in a distributed manner on the circumference, wherein a number of signal tabs project beyond the first axial inner sleeve end in the axial direction, wherein the number of signal tabs each comprise a signal surface, wherein in the parked position of the sliding sleeve a first part of the signal surface is covered by the sliding sleeve and in the locking position of the sliding sleeve a part of the signal surface that is smaller than the first part is covered by the sliding sleeve or the signal surface is completely exposed.It may also be advantageous if a machine-readable code, preferably a QR code, is displayed on at least one of the signal surfaces. This code can be read by a machine when the sliding sleeve is in the locked position. This provides a simple and reliable way to detect the locking state. The machine-readable code can be used, for example, during assembly via a reading device, e.g., a camera system, to detect, preferably automatically, whether the connector has been properly locked.

[0014] For a better understanding of the invention, it is explained in more detail using the following figures.

[0015] They show in a highly simplified, schematic representation:

[0016] Fig. 1 is an exploded view of the connector of an advantageous embodiment; Fig. 2 is a perspective view of the inner sleeve of the connector;

[0017] Fig.3a a perspective longitudinal section through the connector before locking the insertion sleeve;

[0018] Fig.3b a perspective longitudinal section through the connector during locking of the insertion sleeve;

[0019] Fig.3c a perspective longitudinal section through the connector after locking the insertion sleeve;

[0020] Fig. 4 a longitudinal section through the sliding sleeve of the connector including locking element;

[0021] Fig.5a a connector assembly in the uncoupled state of the insertion sleeve;

[0022] Fig.5b a connector assembly in the coupled state of the insertion sleeve;

[0023] Fig. 6 shows a longitudinal section through the connector assembly in the locked state of the insertion sleeve.

[0024] By way of introduction, it should be noted that in the variously described embodiments, identical parts are provided with identical reference symbols or component designations. The disclosures contained throughout the description can be applied analogously to identical parts with identical reference symbols or component designations. Furthermore, the positional information chosen in the description, such as top, bottom, side, etc., refers to the directly described and illustrated figure, and these positional information must be applied analogously to the new position in the event of a change in position.

[0025] Fig. 1 shows the connector 1 according to the invention in an advantageous, non-limiting, embodiment in an exploded view. The connector 1 serves to detachably connect a first fluid line 2a to a second fluid line 2b by means of an insertion sleeve 3. The first fluid line 2a, the insertion sleeve 3, and the second fluid line 2b are not part of the present invention. The connector 1 has a substantially cylindrical inner sleeve 4 with an open first axial inner sleeve end 4a and an opposite open second axial inner sleeve end 4b. The inner sleeve 4 can be made, for example, from a suitable plastic or, if necessary, also from a metallic material. The inner sleeve 4 of the connector 1 is shown in detail in Fig. 2.

[0026] The following description refers to Figs. 1 to 6, with the same reference symbols and component designations being used for identical parts. To avoid unnecessary repetition, reference is made to the detailed description in the preceding figures.

[0027] In the region of the first axial inner sleeve end 4a, a connecting section V is provided for connecting the inner sleeve 4 to the first fluid line 2a. In the example shown, the connecting section V has a number of locking recesses 20, which are designed to interact with a number of corresponding locking projections 21 provided on the first fluid line 2a to form a positive connection. As shown, several locking recesses 20 can be provided distributed around the circumference. In this embodiment, the positive connection can be established in the axial direction and in the circumferential direction.

[0028] Of course, the reverse design (not shown) would also be conceivable, in which a number of locking projections 21 are provided on the connecting section V of the first axial inner sleeve end 4a, which are designed to interact with a number of corresponding locking recesses 20 provided on the first fluid line 2a to form a positive connection. A combination of locking projections 21 and locking recesses 20 would also be conceivable.

[0029] In the circumferential direction, for example, a recess 20a can be provided between each two consecutive latching recesses 20 (or latching projections 21), which extends from the first axial inner sleeve end 4a over part of a length of the inner sleeve 4 in the direction of the second axial inner sleeve end 4b (see Fig. 2). This creates a separate bending tab for each latching recess 20, which allows a certain elasticity in the radial direction. The bending tabs can be bent outwards when connected to the first fluid line 2a, thereby facilitating latching onto the latching projections 21. The illustrated embodiment of the connecting section V is, however, only to be understood as an example. A person skilled in the art could, in principle, also choose another suitable form of connection.The second axial inner sleeve end 4b of the inner sleeve 4 encloses a receiving space AR into which an open first axial insertion sleeve end 3a of the insertion sleeve 3 can be axially inserted. An opposite, open second axial insertion sleeve end 3b of the insertion sleeve 3 can be connected to the second fluid line 2b. The insertion sleeve 3 is not part of the invention and can, for example, be a standardized or normed component, as will be explained in more detail later. Depending on the structural design of the insertion sleeve 3, the second fluid line 2b can also be designed differently. The second fluid line 2b is only indicated by dashed lines in Fig. 2.

[0030] Furthermore, the connector 1 has a locking mechanism for positively locking the insertion sleeve 3 to the inner sleeve 4. In the example shown, the locking mechanism comprises, for example, two identical locking mechanisms arranged diametrically opposite one another on the connector 1 with respect to a longitudinal axis of the inner sleeve 4. More than two, preferably identical, locking mechanisms would of course also be conceivable. For the sake of simplicity, the invention is described using one locking mechanism. If multiple locking mechanisms are provided, it is advantageous for ease of handling if they can be actuated simultaneously for locking and unlocking.

[0031] The locking mechanism comprises at least one locking recess 11 and at least one locking element 12. The locking recess 11 connects an outer circumferential surface AU4 of the inner sleeve 4 to the receiving space AR. When the insertion sleeve 3 is in a fixed coupling position in the receiving space AR of the inner sleeve 4 (see Fig. 3c), the locking element 12 can be displaced within the locking recess 11 between a locking position SS, in which a locking portion 12c (see Fig. 2) of the locking element 12 engages with an engagement opening 13 arranged on the insertion sleeve 3, and a release position FS, in which the locking portion 12c does not engage with the engagement opening 13. When the locking element 12 is engaged with the engagement opening 13, the insertion sleeve 3 is positively connected to the inner sleeve 4 or locked to it, at least in the axial direction.Depending on the design of the locking element 12 and the engagement opening 13, a positive connection in the circumferential direction may also be possible. As can be seen in Fig. 1 and in detail in Fig. 2, the locking recess 11 is preferably designed as a circumferential groove. The circumferential groove can extend in the circumferential direction of the inner sleeve 4, for example, over a groove angle a of at least 30°, preferably at least 60°, particularly preferably at least 90°. The circumferential groove preferably lies in a plane that is normal to the longitudinal axis of the inner sleeve 4.

[0032] An axial position of the locking recess 11 on the inner sleeve 4 can be determined, for example, depending on an axial position of the engagement opening 13 of the insertion sleeve 3. In general, the dimensions of the inner sleeve 4, e.g., an axial length and an inner diameter of the receiving space AR, can be based, for example, on the dimensions of a standardized or standardized insertion sleeve 3. Fig. 1 shows, as an example, an insertion sleeve 3 designed according to a preferred standard of the German Association of the Automotive Industry (VDA).

[0033] The illustrated insertion sleeve 3 has a first cylindrical section ZA1 in the region of the first axial insertion sleeve end 3a. The first cylindrical section ZA1 is connected to a second cylindrical section ZA2 via a conical section 19. The second cylindrical section ZA2 has a larger diameter than the first cylindrical section ZA1. The engagement opening 13 is arranged on an outer circumferential surface AU3 of the second cylindrical section ZA2 and is groove-shaped. In the illustrated example, two engagement openings 13 are provided, which are arranged diametrically opposite one another and each extend over a specific angle in the circumferential direction. Each engagement opening 13 interacts with a locking mechanism of the plug-in connector 1, in particular with a locking element 12.Of course, this embodiment is only exemplary and the engagement opening 13 could also comprise only a single circumferential groove extending around the entire circumference.

[0034] According to the invention, the connector 1 has a sliding sleeve 5 located radially outside the inner sleeve 4, which is axially displaceable along the inner sleeve 4 between a parking position PP (see Fig. 5a), in which the locking mechanism is deactivated, and a locking position VP (see Fig. 5b), in which the locking mechanism is activated. Before the connector 1 can be coupled to the insertion sleeve 3, the sliding sleeve 5 should, of course, be in the parking position PP or be moved from the locking position VP to the parking position PP. This can be done manually by a user, e.g., using the gripping section 15.

[0035] The locking mechanism further comprises a release spring 6 with an actuating portion 7 and a holding portion 8. When the sliding sleeve 5 is in the parking position PP, the release spring 6 is preloaded in a holding position HP, in which the holding portion 8 is engaged with a holding projection 9 of the inner sleeve 4, as shown in Fig. 2 and Fig. 3a.

[0036] Furthermore, an actuating opening 10 is provided on the inner sleeve 4, which connects the outer circumferential surface AU4 with the receiving space AR. The actuating opening 10 is located, viewed in the axial direction of the inner sleeve 4, between the locking recess 11 and the first axial inner sleeve end 4b. The actuating opening 10 is visible in Fig. 2 on the lower locking mechanism. When the release spring 6 is in the holding position HP, the actuating section 7 protrudes radially inward through the actuating opening 10 into the receiving space AR of the inner sleeve 4, as can also be seen in Fig. 2 on the lower locking mechanism.

[0037] When the insertion sleeve 3 is inserted in the axial direction into the receiving space AR of the inner sleeve 4 to establish the locking (as indicated by the arrow in Fig. 3a), the actuating section 7 of the release spring 6 is displaced radially out of the receiving space AR by the insertion sleeve 3, for example by the conical section 19, as indicated by the arrow in Fig. 3b. As a result, the holding section 8 of the release spring 6 is released from the holding projection 9 of the inner sleeve 4, and the release spring 6 exerts a release force FA on the sliding sleeve 5 in the direction of the second axial inner sleeve end 4b, as shown in Fig. 3c.

[0038] For this purpose, a force-absorbing projection 5v, upon which the release spring 6 acts (Fig. 3b), can be arranged on an inner circumferential surface IU5 of the sliding sleeve 5. Due to the release force FA (indicated by an arrow in Fig. 3c), the sliding sleeve 5 is automatically moved (provided it is not blocked) from the parking position PP to the locking position VP.

[0039] Analogous to the position of the locking recess 11, an axial position of the

[0040] The actuating opening 10 on the inner sleeve 4 can be determined depending on the axial position of a conical section 19 of the preferably standardized insert sleeve 3. This ensures that the actuating section 7 of the release spring 6 is reliably actuated and displaced from the receiving space AR when the insert sleeve 3 is inserted into the receiving space AR.

[0041] According to an advantageous embodiment of the invention, the release spring 6 has a restoring force in the region of the holding section 8 directed inward in the radial direction of the inner sleeve 4. This restoring force allows the holding section 8 to engage more effectively with the holding projection 9 when the holding position HP is reached.

[0042] Alternatively or additionally, it may be advantageous if a reset projection 23 is provided on the inner circumferential surface IU5 of the sliding sleeve 5. The reset projection 23 is designed to exert a restoring force on the release spring 6, directed inward in the radial direction of the inner sleeve 4, upon movement of the sliding sleeve 5 from the locking position VP to the parking position PP, by means of which the holding portion 8 of the release spring 6 engages the holding projection 9 upon reaching the holding position HP. In the example according to Fig. 1, the sliding sleeve 5 comprises two diametrically opposed reset projections 23, one reset projection 23 per locking mechanism.

[0043] The reset projection 23 can, for example, be designed as an elongated web that extends from the second sliding sleeve end 5b over part of the length of the sliding sleeve 5 toward the first sliding sleeve end 5a. At an end of the web facing the first sliding sleeve end 5a, an inclined reset surface 23a can be provided, which is designed to interact with the release spring 6, in particular the central section 6c described below - see Fig. 2 - to generate the reset force. The reset surface 23a can be seen in Fig. 1 on the upper reset projection 23.

[0044] In the example shown, the release spring 6 is formed from a spring wire and has a first free wire end 6a, a second free wire end 6b and an intermediate central section 6c (see Fig. 2). As can be seen in Fig. 2, the central section 6c rests at least in sections against the outer circumferential surface UA4 of the inner sleeve 4. In the circumferential direction, the central section 6c can extend, for example, over an angle of at least 30°, preferably at least 45°, particularly preferably at least 60°, in particular at least 90°. In the example shown, the central section 6c is (in plan view) essentially S-shaped and has two arches. However, the central section 6c could also be (in plan view), for example, essentially V-shaped and have only one arch.

[0045] In the region of the first free wire end 6a, a fastening section 17 can be provided, which is fastened to a fastening receptacle 18 arranged on the outer circumferential surface AU4 of the inner sleeve 4 in the region of the first axial inner sleeve end 4a. As can be seen in Fig. 2, the inner sleeve can have a radially projecting collar at the first axial inner sleeve end 4a, which extends over a certain section in the circumferential direction. An axial recess can be provided in this collar, which can serve as a fastening receptacle 18. The holding section 8 can be provided in the region of the second free wire end 6b. The actuating section 7 can also be provided in the region of the second free wire end 6b and can be formed, for example, by a U-shaped section of the spring wire.

[0046] According to a further advantageous embodiment, a stop projection 16 can be provided on the inner circumferential surface IU5 of the sliding sleeve 5, which is designed to form a stop for the second free wire end 6b of the trigger spring 6 in the circumferential direction. The stop projection 16 is shown in Fig. 1. The stop projection 16 can have a stop surface 16a that faces the second free wire end 6b of the trigger spring 6 in the circumferential direction when the sliding sleeve 5 is in the park position PP.

[0047] An end face of the second free wire end 6b of the release spring 6, which delimits the second free wire end 6b in the circumferential direction, can bear against the stop surface 16a of the stop projection 16, whereby undesired movement of the release spring 6 in the circumferential direction can be prevented. The end face of the second free wire end 6b is only visible on the upper release spring 6 in Fig. 1 and Fig. 2. For the upper release spring 6, a stop projection 16 (not shown) can of course be provided in an analogous manner, which can be arranged diametrically opposite the lower stop projection 16 shown in Fig. 1 on the inner circumferential surface IU5 of the sliding sleeve 5.

[0048] Furthermore, a first guide device 14 for guiding the locking element 12 is provided on the sliding sleeve 5. The first guide device 14 is designed such that when the sliding sleeve 5 moves from the parking position PP to the locking position VP, a first guide force FF1 acts on the locking element 12, by which the locking element 12 (if it is not blocked) is displaced from the release position FS to the blocking position SS, as indicated by the arrow in Fig. 3c. When the insertion sleeve 3 is in the coupling position shown in Fig. 3c, the engagement opening 13 is radially aligned with the locking recess 11, and the locking element 12 can be brought into engagement with the engagement opening 13 to establish the positive locking.

[0049] In the example shown, the first guide device 14 of the sliding sleeve 5 has a first guide slot 14a and a second guide slot 14b, which are arranged at a distance from one another in the circumferential direction of the sliding sleeve 5 on the inner circumferential surface IU5 of the sliding sleeve 5 (see Fig. 1). The first guide slot 14a of the first guide device 14 of the lower locking mechanism can be seen in Fig. 1. The opposite second guide slot 14b of the first guide device 14 of the lower locking mechanism is not visible in Fig. 1 and is therefore indicated by dashed lines. The two guide slots 14a, 14b of the first guide device 14 of the upper locking mechanism are designed analogously, but are not visible in Fig. 1.

[0050] In the example shown, the locking element 12 has a cylindrical rod with a first free rod end and an opposite second free rod end. A first guide section 12a is provided in the region of the first free rod end, and a second guide section 12b is provided in the region of the second free rod end. As can be seen in Fig. 2, the locking element 12 is arranged in the groove-shaped locking recess 11 such that the cylindrical rod is arranged essentially tangentially with respect to the inner sleeve 4. The length of the cylindrical rod is dimensioned such that the first guide section 12a and the second guide section 12b are located outside the circumference of the inner sleeve 4 both in the release position FS and in the locking position SS and project beyond the outer circumferential surface UA4 of the inner sleeve 4.

[0051] When the sliding sleeve 5 is mounted on the inner sleeve 4, the first guide section 12a is received in the first guide slot 14a and positively guided by the first guide slot 14a. Similarly, the second guide section 12b is received in the second guide slot 14b and positively guided by the second guide slot 14b. The locking section 12c, which engages the engagement opening 13 of the insert sleeve 3 when the insert sleeve 3 is locked on the inner sleeve 4, is located in a central area between the free rod ends or the guide sections 12a, 12b (see Fig. 2).

[0052] The function of the first guide device 14 is explained in more detail below with reference to Fig. 4. Fig. 4 shows a longitudinal section through the sliding sleeve 5 including the rod-shaped locking element 12. For the sake of simplicity, only the upper half of the sliding sleeve 5 is shown. As already mentioned above, the first guide device 14 has a first guide slot 14a and a second guide slot 14b located opposite it perpendicular to the plane of the drawing (not shown in Fig. 4). The second guide slot 14b is designed essentially identically to the first guide slot 14a.

[0053] The sliding sleeve 5 is axially displaceable along the inner sleeve 4 between the parking position PP (left in Fig. 4) and the locking position VP (right in Fig. 4). Because the locking element 12 is received in the locking recess 11 of the (not shown) inner sleeve 4, the locking element 12 is fixed axially relative to the inner sleeve 4. In the radial direction, the locking element 12 is movable within the locking recess 11 relative to the inner sleeve 4 between the release position FS (see Fig. 3b) and the locking position SP (see Fig. 3c).

[0054] The first guide slot 14a and the second guide slot 14b (not shown) are groove-shaped and each have a first slot section 14_1 and a second slot section 14_2, as can be seen in Fig. 4. The first slot section 14_1 is connected here to the first axial sliding sleeve end 5a of the sliding sleeve 5 in order to facilitate the assembly of the sliding sleeve 5 on the inner sleeve 4.

[0055] The first guide section 14_1 is essentially straight and extends over part of the catches of the sliding sleeve 5 in the direction of the opposite second axial sliding sleeve end 5b of the sliding sleeve 5. The first guide section 14_1 runs essentially parallel to the longitudinal axis A5 of the sliding sleeve 5. As can be seen in Fig. 4, the first guide section 14_1 can also have a conical shape and taper from the first axial sliding sleeve end 5a towards the second axial sliding sleeve end 5b. The second guide section 14_2 borders on the first guide section 14_1 and is also straight here and inclined at an angle to the first guide section 14_1. The second guide section 14_2, in particular the mutually facing walls of the groove, thus forms a type of inclined plane for guiding the first guide section 12a of the locking element 12.The end of the second guide section 14_2 facing the second axial sliding sleeve end 5b of the sliding sleeve 5 is preferably closed. However, the illustrated embodiment is merely exemplary, and the first guide slot 14a could also have a curved profile, for example.

[0056] When the sliding sleeve 5 is in the parking position PP, the locking element 12 is in the release position FS and is received in the second link section 14_2 of the first guide link 14a, as shown in dashed lines in Fig. 4. When the sliding sleeve 5 is in the locking position VP, the locking element 12 is in the blocking position SS and is received in the first link section 14_1 of the first guide link 14a, as also shown in dashed lines in Fig. 4.

[0057] When the sliding sleeve 5 is in a position between the parking position PP and the locking position VP, the locking element 12 is in a position between the release position FS and the blocking position SS (shown in solid lines in Fig. 4). However, this illustration merely serves to illustrate the radial position of the locking element 12. The axial position of the locking element 12 remains unchanged during operation, since the locking element 12 is received in the locking recess 11.

[0058] When the sliding sleeve 5 is moved from the parking position PP to the locking position VP due to the release force FA of the release spring 6 (see Fig. 3c), a first guide force FF1 is exerted on the locking element 12 by the second guide section 14_2 of the first guide guide 14a (directed downward in Fig. 4, as indicated by the arrow). The first guide force FF1 moves the locking element 12 from the release position FS to the locking position SS.

[0059] To release the locking mechanism, the sliding sleeve 5 can be manually moved from the locking position VP back to the parking position PP, preferably by means of a gripping portion 15 provided on the outer circumferential surface AU5. As a result, a compression force opposing the release force FA is transmitted from the sliding sleeve 5, for example, from the force-absorbing projection 5v, to the release spring 6, whereby the holding portion 8 can be returned to the holding position HP.

[0060] The first guide device 14 of the sliding sleeve 5 is designed such that, upon movement of the sliding sleeve 5 from the locking position VP to the parking position PP, a second guide force FF2 is exerted on the locking element 12 by the second guide section 14_2 of the first guide guide 14a (directed upward in Fig. 4, as indicated by the arrow). The second guide force FF2 displaces the locking element 12 from the locked position SS to the released position FS.

[0061] In order to improve the axial guidance of the sliding sleeve 5 along the inner sleeve 4, it is advantageous if at least one second guide device 22 is provided. In the example shown, two second guide devices 22 are provided, which are arranged diametrically opposite one another on the plug connector 1. The second guide device 22 preferably has at least one first guide projection 22a and at least one second guide projection 22b, which are arranged spaced apart from one another in the circumferential direction on the outer circumferential surface AU4 of the inner sleeve 4. In the example shown, for example, two axially spaced first guide projections 22a and two axially spaced second guide projections 22b are provided. The guide projections 22a, 22b are preferably formed integrally with the inner sleeve 4.

[0062] The second guide device 22 further comprises a guide web 32, which is provided on the inner circumferential surface IU5 of the sliding sleeve 5 and which extends in the axial direction at least over part of a length of the sliding sleeve 5. In the example shown, two guide webs 32 are provided, each extending from the second axial sliding sleeve end 5b over part of the length of the sliding sleeve 5 in the direction of the first axial sliding sleeve end 5b. The guide webs 32 can be seen in Fig. 1, wherein only the front end of the guide web 32 shown at the top in Fig. 1 is visible, and the rest is invisible and is therefore shown in dashed lines.When the sliding sleeve 5 is mounted on the inner sleeve 4, a guide web 32 is arranged in the circumferential direction between the at least one first guide projection 22a and the at least one second guide projection 22b and is guided by the guide projections 22a, 22b. As can be seen in Fig. 1, the guide web 32 and the reset projection 23 can be designed as an integral web. A section of the web facing the second sliding sleeve end 5b can function as the guide web 32, and a section of the web facing the first sliding sleeve end 5a (on which the inclined reset surface 23a is provided) can function as the reset projection 23.

[0063] According to a further advantageous embodiment, a number of positioning recesses 24 are provided on the inner sleeve 4, each extending from the second axial inner sleeve end 4b over a portion of the inner sleeve in the direction of the first axial inner sleeve end 4a and each connecting the inner circumferential surface IU4 with the outer circumferential surface AU4 of the inner sleeve 4 (see Fig. 2). The number of positioning recesses 24 are designed to cooperate with a number of corresponding positioning projections 25 provided on the insert sleeve 3 (see Fig. 1) in order to position the insert sleeve 3 in the coupling position in the circumferential direction relative to the inner sleeve 4. The number, position, and size of the positioning recesses 24 preferably depend on the structural design of the insert sleeve 3.In the example shown, two positioning recesses 24 are provided, which are arranged diametrically opposite each other on the inner sleeve 4.

[0064] According to a further advantageous embodiment of the invention, the plug connector 1 comprises an indicator device A to indicate to a user whether the sliding sleeve 5 is in the locking position VP and consequently the locking element 12 is in the blocking position SS. In the example shown, the indicator device A has a number of signal tabs 26 (e.g. four) which are arranged distributed around the circumference of the first axial inner sleeve end 4a. The number of signal tabs 26 can project beyond the first axial inner sleeve end 4a in the axial direction. The number of signal tabs 26 can each comprise a signal surface 27, wherein in the parking position PP of the sliding sleeve 5 a first part of the signal surface 27 is covered by the sliding sleeve 5 and in the locking position VP of the sliding sleeve 5 a smaller part of the signal surface 27 relative to the first part is covered by the sliding sleeve 5 or the signal surface 27 is completely exposed.

[0065] It is advantageous if a machine-readable code, preferably a QR code, is displayed on at least one of the signal surfaces 27. This code can be read by a machine when the sliding sleeve 5 is in the locking position VP. This allows automatic detection of whether the insertion sleeve 3 has been properly coupled to the connector 1. Detection can be performed, for example, using a camera system and industrial image processing.

[0066] Fig. 5a shows a connector assembly comprising the connector 1, the first fluid line 2a, the insertion sleeve 3, and the second fluid line 2b. The first fluid line 2a is mounted on the connector 1 by the latching projections 21 of the first fluid line 2a being latched into the latching recesses 20 of the connection from section V of the inner sleeve 4. Furthermore, the insertion sleeve 3 is connected to the second fluid line 2b. The second fluid line 2b is only indicated schematically. In Fig. 5a, the insertion sleeve 3 is not coupled to the connector 1, and the sliding sleeve 5 is in the park position PP. In the park position PP, at least some of the signal surfaces 27 of the signal tabs 26 are covered by the sliding sleeve 5 and are not visible from the outside. This means that a QR code displayed on the signal surface 27 is partially covered and cannot be read.

[0067] Fig. 5b shows the connector assembly in the coupled state of the insertion sleeve 3 with the connector 1. The sliding sleeve 5 is in the locking position VP, in which the two locking elements 12 (generally the at least one locking element 12) are in the blocking position SS, as shown in Fig. 3c. The locking sections 12c of the locking elements 12 are in engagement with the respective engagement opening 13 of the insertion sleeve 3 in the blocking position SS. The positioning projections 25 of the insertion sleeve 3 are in engagement with the positioning recesses 24 of the inner sleeve 4, thereby ensuring that the insertion sleeve 3 is in the correct coupling position in the circumferential direction.

[0068] As can also be seen in Fig. 5b, the sliding sleeve 5 is arranged in the locking position VP relative to the inner sleeve 4 in the axial direction such that the second axial sliding sleeve end 5b of the sliding sleeve 5 projects beyond the second axial inner sleeve end 4b of the inner sleeve 4. As a result, a larger portion of the signal surfaces 27 of the signal tabs 26 is exposed than in the parking position PP (according to Fig. 5a), so that a QR code shown thereon can be read. Preferably, the signal surfaces 27 are essentially completely exposed. Reading can be carried out, for example, automatically or manually by a technician, e.g. using a suitable camera or a QR code scanner. If the QR code cannot be read, this means that the sliding sleeve 5 has not reached the locking position VP and the coupling process was therefore not carried out correctly.The information can, for example, be used to repeat the pairing process until correct pairing is achieved.

[0069] Fig. 6 shows a longitudinal section through the connector assembly in the coupled state of the insertion sleeve 3. The illustration in Fig. 6 essentially corresponds to the illustration in Fig. 3c. On an inner circumferential surface IU2 of an end section of the first fluid line 2a, a first circumferential shoulder 28 with a first annular end face 28a is provided, which faces the open end of the first fluid line 2a in the axial direction. Furthermore, on the inner circumferential surface IU4 of the inner sleeve 4, a second circumferential shoulder 29 with a second annular end face 29a is provided, which faces the first open inner sleeve end 4a in the axial direction.

[0070] A sealing chamber 30, in which a sealing element 31 is arranged, is formed between the first annular end face 28a and the second annular end face 29a, viewed in the axial direction, and between the inner circumferential surface IU2 of the end section of the first fluid line 2a and the outer circumferential surface AU3 of the first cylindrical section ZA1 of the insertion sleeve 3, viewed in the radial direction. The sealing element 31 shown has a substantially cylindrical outer circumferential surface that bears against the inner circumferential surface of the end section of the first fluid line 2a. Thus, the sealing element 31 can be pre-assembled, for example, on the first fluid line 2a.

[0071] The inner circumferential surface is convex or rounded and is in contact with the outer circumferential surface AU3 of the first cylindrical section ZA1 of the insert sleeve 3. When the insert sleeve 3 is coupled, the sealing element 31 can create a seal between the insert sleeve 3 and the first fluid line 2a. A sealing ring made of a suitable material, for example, can be used as the sealing element 31. Depending on the application (e.g., depending on pressure, temperature, type of fluid, etc.), different materials can also be used, e.g., rubber, silicone, etc.

[0072] The embodiments show possible embodiments, whereby it should be noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but rather various combinations of the individual embodiments with each other are also possible and this possibility of variation lies within the skill of the person skilled in the art in this technical field due to the teaching of technical action by means of the objective invention.

[0073] The scope of protection is determined by the claims. However, the description and drawings must be used to interpret the claims. Individual features or combinations of features from the various embodiments shown and described may represent independent inventive solutions. The problem underlying these independent inventive solutions can be derived from the description.

[0074] All information on value ranges in this description is to be understood as including any and all sub-ranges thereof, e.g. the information 1 to 10 is to be understood as including all sub-ranges starting from the lower limit of 1 and the upper limit of 10, ie all sub-ranges begin with a lower limit of 1 or greater and end with an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

[0075] For the sake of clarity, it should finally be pointed out that, in order to better understand the structure, some elements have been shown out of scale and / or enlarged and / or reduced in size.

[0076] Reference numerals Plug connector 21 Snap-in projection a First fluid line 22 Second guide device b Second fluid line 22a First guide projection Insert sleeve 22b Second guide projection a First axial insert sleeve end 23 Reset projection b Second axial insert sleeve end 23a Reset surface Inner sleeve 24 Positioning recess a First axial insert sleeve end 25 Positioning projection b Second axial insert sleeve end 26 Signal tab Sliding sleeve 27 Signal surface Release spring 28 First circumferential shoulder Actuating section 28a First annular end face Holding section 29 Second circumferential shoulder Holding projection 29a Second annular end face 0 Actuating opening 30 Sealing chamber 1 Locking opening 31 Sealing element 2 Locking element 32 Guide s Web 2a First guide section IU2 Inner circumferential surface of the End section 2b Second guide section of the first fluid line 2c Blocking section IU4 Inner circumferential surfaceof the inner sleeve 3 engagement opening IU5 inner circumferential surface of the sliding sleeve 4 first guide device 4a first guide slot AU3 outer circumferential surface of the insertion sleeve 4b second guide slot AU4 outer circumferential surface of the inner sleeve 5 gripping section AU5 outer circumferential surface of the sliding sleeve 6 stop projection V connecting section 6a stop surface PP parking position 7 fastening section VP locking position 8 fastening receptacle AR receiving space 9 conical section FS release position 0 engagement recess SS locking position FA release force

[0077] FF First Manager

[0078] FF2 Second Manager

[0079] HP holding position

[0080] ZA1 First cylindrical section

[0081] ZA2 Second cylindrical section a groove angle

Claims

P a t e n t a n s p r ü c h e 1. Plug-in connector (1) for detachably connecting a first fluid line (2a) to a second fluid line (2b) by means of an insertion sleeve (3), wherein the plug-in connector (1) has an inner sleeve (4) with an open first axial inner sleeve end (4a) and an opposite open second axial inner sleeve end (4b), wherein in the region of the first axial inner sleeve end (4a) a connecting section (V) for connecting the inner sleeve (4) to the first fluid line (2a) is provided, wherein the second axial inner sleeve end (4b) encloses a receiving space (AR) into which an open first axial insertion sleeve end (3a) of the insertion sleeve (3) can be axially inserted, wherein an opposite open second axial insertion sleeve end (3b) of the insertion sleeve (3) can be connected to the second fluid line (2b), wherein the plug-in connector (1) has a locking mechanism for positively locking the Insert sleeve (3) with the inner sleeve (4),wherein the locking mechanism comprises a locking recess (11) and a locking element (12), wherein the locking recess (11) connects an outer circumferential surface (AU4) of the inner sleeve (4) to the receiving space (AR), wherein, when the plug-in sleeve (3) is in a fixed coupling position in the receiving space (AR) of the inner sleeve (4), the locking element (12) is displaceable within the locking recess (11) between a blocking position (SS), in which a blocking section (12c) of the locking element (12) is in engagement with an engagement opening (13) arranged on the plug-in sleeve (3), and a release position (FS), in which the blocking section (12c) is not in engagement with the engagement opening (13), characterized in that the plug-in connector (1) has a sliding sleeve (5) lying radially outside the inner sleeve (4), which in axial direction along the inner sleeve (4) between a parking position (PP),in which the locking mechanism is deactivated and a locking position (VP) in which the locking mechanism is activated, is displaceable, in that the locking mechanism comprises a release spring (6) with an actuating section (7) and a holding section (8), wherein the release spring (6) in the parking position (PP) of the sliding sleeve (5) is pretensioned in a holding position (HP) in which the holding section (8) is engaged on a holding projection (9) of the inner sleeve (4), wherein the actuating section (7) in the holding position (HP) projects inward in the radial direction through an actuating opening (10) provided on the inner sleeve (4) into the receiving space (AR) of the inner sleeve (4), wherein the actuating opening (10), viewed in the axial direction of the inner sleeve (4), is between the, Locking recess (11) and the first axial inner sleeve end (4b), wherein the actuating section (7) of the release spring (6) can be displaced in the radial direction out of the receiving space (AR) by the insert sleeve (3) when the insert sleeve (3) is inserted into the receiving space (AR) of the inner sleeve (4), whereby the holding section (8) of the release spring (6) can be released from the holding projection (9) of the inner sleeve (4) and a release force (FA) directed in the direction of the second axial inner sleeve end (4b) acts on the sliding sleeve (5) by means of which the sliding sleeve (5) can be displaced from the parking position (PP) into the locking position (VP), and wherein a first guide device (14) for guiding the locking element (12) is provided on the sliding sleeve (5), which is designed in such a waythat when the sliding sleeve (5) moves from the parking position (PP) into the locking position (VP), a first guide force (FF1) acts on the locking element (12), by means of which the locking element (12) can be displaced from the release position (FS) into the blocking position (SS).

2. Plug connector according to claim 1, characterized in that the sliding sleeve (5), preferably by means of a gripping section (15) provided on the outer circumferential surface (AU5), can be manually displaced from the locking position (VP) back into the parking position (PP), whereby a compression force opposite to the release force (FA) can be transmitted to the release spring (6), whereby the holding section (8) can be brought back into the holding position (HP), wherein the first guide device (14) of the sliding sleeve (5) is designed such that when the sliding sleeve (5) moves from the locking position (VP) into the parking position (PP), a second guide force (FF2) acts on the locking element (12), by means of which the locking element (12) can be displaced from the blocking position (SS) into the release position (FS).

3. Plug connector according to claim 1 or 2, characterized in that the release spring (6) in the region of the holding section (8) has a restoring force (FR) directed inwards in the radial direction of the inner sleeve (4), by means of which the holding section (8) engages the holding projection (9) when the holding position (HP) is reached and / or that a restoring projection (23) is provided on the inner circumferential surface of the sliding sleeve (5), which is designed to have a restoring force directed inwards in the radial direction of the inner sleeve (4) when the sliding sleeve (5) moves from the locking position (VP) into the parking position (PP). To exert a restoring force (FR) on the release spring (6), by means of which the holding section (8) of the release spring (6) engages the holding projection (9) when the holding position (HP) is reached.

4. Plug connector (1) according to one of claims 1 to 3, characterized in that the release spring (6) has a spring wire with a first free wire end (6a), a second free wire end (6b) and with an intermediate central section (6c), wherein the central section (6c) at least partially rests on the outer circumferential surface (UA4) of the inner sleeve (4) and extends in the circumferential direction preferably over an angle of at least 30°, preferably at least 45°, particularly preferably at least 60°, in particular at least 90°, wherein the central section (6c) is preferably substantially S-shaped or substantially V-shaped.

5. Connector (1) according to claim 4, characterized in that in the region of the first free wire end (6a) a fastening section (17) is provided, which is fastened to a fastening receptacle (18) arranged in the region of the first axial inner sleeve end (4a) on the outer circumferential surface (AU4) of the inner sleeve (4) and that the holding section (8) is provided in the region of the second free wire end (6b).

6. Connector (1) according to claim 4 or 5, characterized in that a stop projection (16) is provided on the inner circumferential surface (IU5) of the sliding sleeve (5), which stop projection is designed to form a stop for the second free wire end (6b) of the release spring (6) in the circumferential direction.

7. Plug connector (1) according to one of claims 1 to 6, characterized in that the locking recess (11) is designed as a circumferential groove and extends in the circumferential direction of the inner sleeve (4) over a groove angle (a) of at least 30°, preferably at least 60°, particularly preferably at least 90°, wherein the circumferential groove preferably lies in a plane which is normal to the longitudinal axis of the inner sleeve (4).

8. Connector (1) according to one of claims 1 to 7, characterized in that an axial position of the locking recess (11) on the inner sleeve is determined as a function of an axial position of the engagement opening (13) of the insertion sleeve (3) and / or that an axial position of the actuating opening (10) on the inner sleeve (4) is determined as a function of an axial position of a conical section (19) of the insertion sleeve (3).

9. Plug connector (1) according to one of claims 1 to 8, characterized in that the first guide device (14) of the sliding sleeve (5) comprises a first guide slot (14a) and a second guide slot (14b), which are arranged spaced apart from one another in the circumferential direction of the sliding sleeve (5) on the inner circumferential surface (IU5) of the sliding sleeve (5), that the locking element (12) comprises a rod with a first free rod end and an opposite second free rod end, wherein in the region of the first rod end a first guide section (12a) is provided, which is positively guided in the first guide slot (14a), and in the region of the second rod end a second guide section (12b) is provided, which is positively guided in the second guide slot (14b), and wherein the locking section (12c) is located between the free rod ends.

10. Connector (1) according to one of claims 1 to 9, characterized in that the locking mechanism comprises at least two similar locking mechanisms which are arranged on the connector (1) preferably diametrically opposite one another with respect to a longitudinal axis of the inner sleeve (4).

11. Plug connector (1) according to one of claims 1 to 10, characterized in that the connecting section (V) of the first axial inner sleeve end (4a) comprises a number of latching recesses (20) which are designed to cooperate with a number of corresponding latching projections (21) provided on the first fluid line (2a) in order to form a positive connection in the axial direction and / or in the circumferential direction and / or that the connecting section (V) of the first axial inner sleeve end (4a) comprises a number of latching projections (21) which are designed to cooperate with a number of corresponding latching recesses (20) provided on the first fluid line (2a) in order to form a positive connection in the axial direction and / or in the circumferential direction.

12. Plug connector (1) according to one of claims 1 to 11, characterized in that a second guide device is provided for axially guiding the sliding sleeve (5) along the inner sleeve (4), wherein the second guide device (22) preferably comprises at least one first guide projection (22a) and at least one second guide projection (22b), which are arranged spaced apart from one another in the circumferential direction on the outer circumferential surface (AU4) of the inner sleeve (4) and comprises a guide web (32) which is provided on the inner circumferential surface (IU5) of the sliding sleeve (5) and extends in the axial direction at least over part of a length of the sliding sleeve (5), wherein the guide web (32) is guided in the circumferential direction between the first guide projection (22a) and the second guide projection (22b).

13. Plug connector (1) according to one of claims 1 to 12, characterized in that a number of positioning recesses (24) are provided on the inner sleeve (4), each extending from the second axial inner sleeve end (4b) over a part of the inner sleeve in the direction of the first axial inner sleeve end (4a) and each connecting the inner circumferential surface (IU4) to the outer circumferential surface (AU4) of the inner sleeve (4), wherein the number of positioning recesses (24) are designed to cooperate with a number of corresponding positioning projections (25) provided on the plug-in sleeve (3) in order to position the plug-in sleeve (3) in the coupling position in the circumferential direction relative to the inner sleeve (4).

14. Connector (1) according to one of claims 1 to 13, characterized in that the connector (1) has an indicator device (A) to indicate to a user whether the sliding sleeve (5) is in the locking position (VP) and the locking element (12) is in the blocking position (SS).

15. Connector (1) according to claim 14, characterized in that the indicator device (A) comprises a number of signal tabs (26) which are arranged distributed around the circumference of the first axial inner sleeve end (4a), wherein a number of signal tabs (26) project beyond the first axial inner sleeve end (4a) in the axial direction, wherein the number of signal tabs (26) each comprise a signal surface (27), wherein in the parking position (PP) of the sliding sleeve (5) a first part of the signal surface is covered by the sliding sleeve (5) and in the locking position (VP) of the sliding sleeve (5), a part of the signal surface (27) which is smaller than the first part is covered by the sliding sleeve (5) or the signal surface (27) is completely exposed, wherein preferably on at least one of the signal surfaces (27) a machine-readable code, in particular a QR code, is depicted which can be read by machine when the sliding sleeve (5) is in the locking position (VP).

16. Connector assembly comprising a connector (1) according to one of claims 1 to 15, a first fluid line (2a), an insertion sleeve (3) and preferably a second fluid line (2b).

17. Connector assembly according to claim 16, characterized in that the connecting section (V) of the inner sleeve (4) is connected to the first fluid line (2a), wherein the plug-in sleeve (3) is positioned in the coupling position within the receiving space (AR) of the inner sleeve (4), wherein the sliding sleeve (5) is in the locking position (VP) and the at least one locking element (12) is in the blocking position (SS) and is in engagement with the engagement opening (13) of the plug-in sleeve (3), wherein the second axial plug-in sleeve end (3b) is connected to the second fluid line (2b).

18. Connector assembly according to claim 17, characterized in that on an inner circumferential surface of an end section of the first fluid line (2a) connected to the connecting section (V) of the inner sleeve (4), a first circumferential shoulder (28) with a first annular end face (28a) is provided, which faces the inner sleeve (4) in the axial direction, that on the inner circumferential surface (IU4) of the inner sleeve (4), a second circumferential shoulder (29) with a second annular end face (29a) is provided, which faces the first fluid line (2a), wherein, viewed in the axial direction, between the first annular end face (28a) and the second annular end face (29a) and viewed in the radial direction, a sealing space (30) is formed, in which a sealing element (31) is arranged. is.

19. Use of a plug connector (1) according to one of claims 1 to 15 for connecting a first fluid line (2a) to a second fluid line (2b), characterized in that the connecting section (V) of the inner sleeve (4) of the plug connector (1) is connected to the first fluid line (2a) and that one plug-in sleeve (3) is connected to the second fluid line (2b) by the second axial plug-in sleeve end (3b), that the first axial plug-in sleeve end (3a) of the plug-in sleeve (3) is inserted into the receiving space (AR) of the inner sleeve (4) of the plug connector (1) until the plug-in sleeve (3) is in the coupling position, wherein during the insertion the holding section (8) of the release spring (6) is displaced from the receiving space (AR) by a conical section of the plug-in sleeve (3) and the holding section (8) is released from the holding position, wherein a release force is exerted by the holding section (8) after the release (FA) is exerted on the sliding sleeve (5),by means of which the sliding sleeve (5) is moved from the parking position (PP) into the locking position (VP), wherein during the movement of the sliding sleeve (5) from the parking position (PP) into the locking position (VP), a first guide force (FF1) is exerted on the locking element (12) by the first guide device (14) of the sliding sleeve (5), by means of which the locking element (12) is displaced within the locking recess (11) from the release position (FS) into the locking position (SS), and wherein the locking section (12c) of the locking element (12) engages with an engagement opening (13) arranged on the insertion sleeve (3) in order to positively lock the insertion sleeve (3) to the inner sleeve (4) at least in the axial direction.

20. Use according to claim 19, characterized in that the sliding sleeve (5), preferably by means of a gripping section (15) provided on the outer circumferential surface (AU5), is manually displaced from the locking position (VP) back into the parking position (PP), wherein during the displacement via the sliding sleeve (5) a compression force opposite to the release force (FA) is exerted on the holding section (8) of the release spring (6), by which the holding section (8) is brought back into the holding position (HP) and engages on the holding projection (9), wherein during the movement of the sliding sleeve (5) from the locking position (VP) into the parking position (PP) a second guide force (FF2) is exerted by the first guide device (14) on the locking element (12), by which the locking element (12) is displaced from the blocking position (SS) back into the release position (FS), whereby the blocking section (12c) of the Locking element (12) releases the engagement opening (13) of the insertion sleeve (3) in order to release the positive locking.

Images