STECKKUPPLUNG

Description

[0001] The invention relates to a plug-in coupling for fluid-carrying applications.

[0002] Plug-in couplings for detachably connecting two line sections, in particular hose sections through which a fluid is conveyed, are generally known, for example from EP 1 644 656 B1. They comprise at least two coupling elements that can be detachably connected to one another to enable fluid flow between the two line sections. A valve body can be slidably guided in the coupling elements to seal the coupling elements in a fluid-tight manner when the plug-in coupling is uncoupled.

[0003] To secure the coupling elements of the plug-in coupling relative to each other in the coupled state, the female coupling element of known plug-in couplings has a spring-loaded pushbutton that can be actuated radially relative to the plug-in direction of the coupling elements. By radially pressing the pushbutton, a latch, which engages with a contour provided on the circumference of the male coupling element, is moved out of this contour, allowing the coupling elements to be separated from each other.

[0004] A major disadvantage of conventional plug-in couplings is that they are relatively complex to manufacture and therefore expensive. Furthermore, due to the radially depressible pushbutton, conventional plug-in couplings are relatively large and thus take up considerable space in the housings of technical devices, such as coffee machines, in which the plug-in couplings are used.

[0005] Document DE 10 2018 008 868 A1 discloses a quick-release coupling for fluid lines. It comprises a sleeve and a plug that can be inserted into the sleeve. The sleeve includes a locking and unlocking mechanism that has a claw locking ring and a claw locking ring release mechanism.

[0006] Based on this, it is the object of the invention to provide a plug-in coupling which is relatively easy to manufacture and thus inexpensive to produce and, moreover, has a small overall size.

[0007] The problem is solved by a plug-in coupling having the features of independent patent claim 1. Preferred embodiments are the subject of the subclaims.

[0008] According to one aspect, the invention relates to a plug-in coupling. The plug-in coupling comprises at least a first coupling element as a male coupling element and a second coupling element as a female coupling element, also referred to as a coupling socket. The first coupling element comprises a first valve body and a first coupling element housing. The first valve body is arranged in a spring-loaded manner so as to be displaceable in the first coupling element housing and, in the uncoupled state of the plug-in coupling, rests against a sealing seat provided in the first coupling element housing due to the spring load. The second coupling element has a second coupling element housing with an opening into which the first coupling element can be partially inserted. The opening of the second coupling element has a plug insert for the non-destructively releasable fixation of the first coupling element in the second coupling element housing.The plug insert comprises a plug sleeve, a fixing element, and a release element with an insertion opening. The fixing element is designed to releasably fix the first coupling element, which is inserted into the insertion opening, in the plug insert. The release element interacts with the fixing element in such a way that the fixation of the first coupling element is released by axial displacement of the release element relative to the plug sleeve.

[0009] The technical advantage of the plug-in coupling is that, by using a plug-in insert, which is inserted into the opening of the second coupling element and has an axially displaceable release element, a cost-effective plug-in coupling with a reduced size can be created. The invention is based on the finding that with such a plug-in insert, the male coupling element of a plug-in coupling can also be securely held in the female coupling element, despite the fact that the coupling element housing of the male coupling element is made of a hard material, for example, a cured plastic.

[0010] According to one embodiment, the second coupling element has a second valve body, which is spring-loaded and displaceably arranged in the second coupling element housing and, when the plug-in coupling is uncoupled, is in a sealed position due to the spring load. In the coupled state, however, the first and second valve bodies are moved out of the sealed position by the interaction of the coupling elements. This ensures that both the male and female coupling elements are sealed fluid-tight after uncoupling, thus preventing fluid leakage.

[0011] According to one exemplary embodiment, the second coupling element housing has at least one further opening in which a further plug insert is provided for fixing a further first coupling element. The further plug insert also comprises a plug sleeve, a fixing element, and a release element with an insertion opening. The fixing element of the further plug insert is designed for the releasable fixing of the further, first coupling element in the further plug insert, and the release element interacts with the fixing element such that the fixing of the further first coupling element is released by an axial displacement of the release element relative to the plug sleeve. Thus, two male coupling elements can be connected to one another by means of a female coupling element using a pair of plug inserts, which are provided in particular opposite one another. The female coupling element preferably does not have a valve body.When coupling the plug-in coupling, the valve bodies of the two male coupling elements preferably interact with each other in such a way that they are lifted from their sealing seat and thus the fluid channel through the plug-in coupling is released.

[0012] According to one embodiment, the release element can be displaced in the plug-in insert parallel, in particular coaxially, to the insertion direction of the first coupling element. This allows the second coupling element to be smaller in size, since no installation space is required for a button that can be actuated in the radial direction (radial relative to the insertion direction).

[0013] According to one embodiment, a sealing element is provided in the opening of the second coupling element, which is secured by the plug insert. The sealing element is designed to seal the transition between the first and second coupling elements by enclosing the first coupling element on the outer circumference. This enables simple assembly, and the sealing element is provided internally in the female coupling element, thus eliminating the risk of damage to a sealing element provided on the first coupling element, which is located externally in the uncoupled state.

[0014] According to one embodiment, the fixing element is a disc-shaped claw ring with an inner opening, on which a plurality of reversibly bendable claws are provided on the inner circumference for fixing the first coupling element. The claw ring surrounds the first coupling element circumferentially and enables circumferential fixing at a plurality of preferably evenly distributed fixing points, creating a stable connection between the first and second coupling elements.

[0015] According to one embodiment, the plug-in sleeve comprises a sleeve section formed from at least one wall element. The wall element is formed by punching and bending a flat metallic material section into a shell-like or circumferentially closed element. The fixing element is enclosed by the sleeve section and positively fixed in the sleeve section. Manufacturing the plug-in sleeve from a flat metallic material section using a punching and bending technique enables cost-effective production of the plug insert, since the plug-in sleeve does not require machining.

[0016] According to one embodiment, the fixing element is fixed at the edge in a bead of the sleeve section of the plug-in sleeve, which is manufactured using a stamping and bending technique, or is held in place by means of a snap mechanism by axially pressing it into a plug-in sleeve manufactured using a stamping and bending technique. This allows the fixing element to be securely held in the plug-in sleeve without the plug-in sleeve having to be constructed in several parts in the insertion direction in order to hold the fixing element between two parts of the plug-in sleeve.

[0017] According to one embodiment, the sleeve section is configured to taper in a funnel shape between a central region in which the fixing element is held and a second free end of the plug-in sleeve opposite the release element. As a result, the sleeve section tapers toward the second free end to form a contact surface for a sealing element. Furthermore, the funnel-shaped taper of the sleeve section can provide lateral guidance for the first coupling element, allowing it to be inserted centrally into the sealing element.

[0018] According to one embodiment, the sleeve portion has a flange at a second free end of the plug-in sleeve opposite the insertion opening to form a contact surface for the sealing element. The flange can be formed by a radially outwardly bent, planar section of the flat material from which the plug-in sleeve is formed. This allows the contact surface that holds the sealing element in position to be enlarged.

[0019] According to one embodiment, the sleeve section has a flange at a second free end opposite the release element, on which a plurality of claws are provided, distributed circumferentially, for securing the plug-in sleeve in the second coupling element housing. The flange is preferably segmented, with a claw provided between each two consecutive flange segments. By arranging the claws in the region of the flange, the overall height of the plug-in insert can be reduced. Furthermore, the use of claws allows the plug-in insert to be pressed in with less force than with a plug-in insert that is inserted by press-fitting.

[0020] According to one exemplary embodiment, the plug-in sleeve is formed from at least two plug-in sleeve elements that adjoin one another in the circumferential direction and can be assembled by means of the adjoining plug-in sleeve elements to form a closed plug-in sleeve with a circular cross-section. The plug-in sleeve elements are made of plastic. The plug-in sleeve has a bead in its interior in which the fixing element is positively fixed when the plug-in sleeve is assembled. The segmentation of the plug-in sleeve in the circumferential direction opens up the possibility of first inserting the fixing element into a plug-in sleeve element and then closing the plug-in sleeve circumferentially by placing at least one further plug-in sleeve element on top, such that the plug insert that is closed on the circumferential side can be introduced into the second coupling element.The plastic construction of the plug-in sleeve elements allows for a more cost-effective manufacturing process compared to a metal plug-in sleeve. Another advantage of the plug-in insert is that the release element does not need to be pressed into the plug-in sleeve; instead, the multi-part design allows it to be inserted into the sleeve before assembly. This prevents the formation of chips that can result from abrasion during the pressing process.

[0021] According to one embodiment, the plug-in sleeve elements can be fixed relative to one another in the assembled state by connecting means such that, in interaction with one another, they form the circumferentially closed plug-in sleeve. The connecting means fix the plug-in sleeve elements in position relative to one another after assembly, so that the plug-in sleeve created by the assembly of the plug-in sleeve elements is secured against unwanted disassembly.

[0022] According to one embodiment, the connecting means comprise at least one tenon connection and / or at least one snap-in connection. The connecting means can be provided, for example, on the joining surfaces that come into contact with each other when the plug-in sleeve elements are assembled. This allows for an easy-to-manufacture yet secure connection between the plug-in sleeve elements.

[0023] According to one embodiment, the plug-in sleeve is segmented in the circumferential direction and not segmented in the axial direction. In other words, the plug-in sleeve elements each form a section of the plug-in sleeve, which, viewed in the circumferential direction, forms an angular sector of the plug-in sleeve. In the axial direction, i.e., in the direction in which the first coupling element is inserted into the plug-in sleeve, the plug-in sleeve element extends over the entire length of the plug-in sleeve, i.e., in the axial direction, the plug-in sleeve is not formed in multiple parts.

[0024] According to one embodiment, the plug-in sleeve elements are identically designed parts. This simplifies the manufacture of the plug-in sleeve because there are more identical parts and there is no need to distinguish between differently shaped plug-in sleeve elements when assembling the parts of the plug insert.

[0025] According to one embodiment, the plug-in sleeve also forms a sliding guide for the axial displacement of the release member in the assembled state, ie the outer wall of the release member lies, for example, at least partially against the inner wall of the plug-in sleeve, so that the plug-in sleeve enables a guided displacement of the release member.

[0026] A "valve body" in the sense of the present disclosure can be understood as a valve tappet or a sleeve. A valve tappet forms a valve body with fluid flowing around it on the outside, while a valve body designed as a sleeve has an internal opening through which fluid flows when the plug-in coupling is connected. The terms "approximately," "substantially," or "about" in the sense of the invention mean deviations from the respective exact value by + / - 10%, preferably by + / - 5%, and / or deviations in the form of changes that are insignificant for function.

[0027] Further developments, advantages, and possible applications of the invention will become apparent from the following description of exemplary embodiments and from the figures. All described and / or illustrated features, individually or in any combination, are fundamentally part of the invention, regardless of their summary in the claims or their reference back to them. The content of the claims is also incorporated into the description.

[0028] The invention is explained in more detail below with reference to several exemplary embodiments. They show: Fig. 1 shows an example of a longitudinal section through a first ,Non-inventive embodiment of a plug-in coupling along a central longitudinal axis, wherein the first and second coupling elements are in a decoupled state, in which the first coupling element is pulled out of the second coupling element and the first and second valve bodies are in a sealing position; Fig. 2 shows an example of a longitudinal section through the plug-in coupling according to Fig. 1along the central longitudinal axis, wherein the first and second coupling elements are in the coupled state, in which the first and second valve bodies interact in such a way that they are lifted from the sealing seat; Fig. 3 shows an example of a longitudinal section through a second embodiment of a plug-in coupling according to the invention along a central longitudinal axis, wherein the plug-in coupling has two first coupling elements and a second coupling element, which are in a decoupled state. Fig. 4 shows an example of a longitudinal section through the second embodiment of the plug-in coupling according to Fig. 3 , wherein a first coupling element is inserted into the second coupling element and coupled thereto, but the further first coupling element is still decoupled from the second coupling element; Fig. 5 shows, by way of example, a longitudinal section through the second embodiment of the plug-in coupling according to Fig. 3 and 4, wherein the two first coupling elements are inserted into the second coupling element and coupled thereto; Fig. 6 shows an example of a sectional view of a plug-in insert, wherein, among other things, the sleeve section of the plug-in sleeve is manufactured from a metallic flat material by means of a punching and bending technique; Fig. 7 shows an example of an exploded and sectional view of the plug-in insert according to Fig. 6 , the sleeve section of which is segmented in the circumferential direction and composed of several wall elements; Fig. 8 shows, by way of example and in a perspective view, a further embodiment of a plug-in insert comprising two plug-in sleeve elements in a partially exploded view; and Fig. 9 shows, by way of example, a longitudinal sectional view of the plug-in insert according to Fig. 8 .

[0029] Fig. 1 and 2 each show sectional views of a plug-in coupling 1 in different coupling states, where Fig.1 the decoupled state and Fig. 2show the coupled state.

[0030] The plug-in coupling 1 is designed to create a liquid-tight, detachable connection between the ends of two hose or pipe pieces.

[0031] The plug-in coupling 1 comprises a first coupling element 2 and a second coupling element 3. The first coupling element 2 is designed as a male coupling element, the second coupling element as a female coupling element.

[0032] The first coupling element 2 has a first valve body 2.1, which is designed as a valve tappet, and a first coupling element housing 2.2. The first valve body 2.1 has a sealing element 2.1.2, in particular a sealing ring. The first valve body 2.1 is provided for axial displacement in the first coupling element housing 2.2. In the uncoupled state of the plug-in coupling 1, it is held in a first position by a spring 2.4, in which the first valve body 2.1 rests in a sealing position against a valve seat or sealing seat 2.3 formed in the first coupling element housing 2.2.

[0033] A fluid channel 2.2.1 is formed in the first coupling element housing 2.2, which is closed by the first valve body 2.1 when the first valve body 2.1 rests against the valve seat or sealing seat 2.3. When the first valve body 2.1 is in an open position against the spring force, i.e., lifted from the sealing seat 2.3, the fluid channel 2.2.1 is open, allowing the fluid to flow through the first coupling element housing 2.2.

[0034] The first coupling element housing 2.2 can be configured to receive a hose coupling at the free end opposite the valve seat or sealing seat 2.3, or can have such a hose coupling. The hose coupling can be formed, for example, by a plug-in insert 4, which will be described in more detail below.

[0035] Similarly, the second coupling element 3 has a second valve body 3.1, designed as a valve tappet, and a second coupling element housing 3.2. The second valve body 3.1 has a sealing element 3.1.2, in particular a sealing ring. The second valve body 3.1 is provided axially displaceably in the second coupling element housing 3.2. In the uncoupled state of the plug-in coupling 1, it is held in a first position by a spring 3.4, in which the second valve body 3.1 rests in a sealing position against a valve seat or sealing seat 3.3 formed in the second coupling element housing 3.2.

[0036] A fluid channel 3.2.1 is formed in the second coupling element housing 3.2, which is closed by the second valve body 3.1 when the second valve body 3.1 rests against the valve seat or sealing seat 3.3. When the second valve body 3.1 is in an open position against the spring force, i.e., lifted from the sealing seat 3.3, the fluid channel 3.2.1 is open, allowing the fluid to flow through the second coupling element housing 3.2.

[0037] The second coupling element housing 3.2 can be configured to receive a hose coupling at the free end opposite the valve seat or sealing seat 3.3, or can have such a hose coupling. The hose coupling can be formed, for example, by a plug-in insert 4, which will be described in more detail below.

[0038] A coupling section 3.5 with a receiving space and an opening is provided on the second coupling element 3, wherein the first coupling element 2 can be partially inserted into the coupling section 3.5. To fix the first coupling element 2 in the second coupling element 3 after insertion, a plug insert 4 is provided, which will be described in more detail below.

[0039] When the first coupling element 2 is inserted into the second coupling element, the end sections 2.1.1, 3.1.1 of the first and second valve bodies 2.1, 3.1, which are provided at the free ends of the valve bodies 2.1, 3.1, come into contact with one another. During the insertion movement, these exert a force on one another that counteracts the spring force of the springs 2.4, 3.4, so that the first and second valve bodies 2.1, 3.1 are lifted from their sealing seats and each releases the fluid channel 2.2.1, 3.2.1. The valve bodies 2.1, 3.1 thus ensure that when the plug-in coupling 1 is coupled, the fluid can flow through the plug-in coupling 1, and when the plug-in coupling 1 is decoupled, the fluid channels 2.2.1, 3.2.1 of the coupling elements 2, 3 are sealed fluid-tight by the valve bodies 2.1, 3.1.

[0040] The end sections 2.1.1, 3.1.1 can be truncated conical and taper towards the free end in order to improve the flow resistance of the plug-in coupling 1.

[0041] Fig. 3 to 5 show a second embodiment of the plug-in coupling 1 in different coupling states.

[0042] The following describes only the differences from the previously described first embodiment. Otherwise, the above statements also apply to the second embodiment.

[0043] The essential difference between the second embodiment and the first embodiment is that the second coupling element 3 is merely designed as a substantially tubular coupling piece, which has a coupling section 3.5 on each of two opposite sides, into which a first coupling element 2 can be partially inserted and fixed after insertion. The second coupling element 3 itself does not have a valve body, but merely forms a receptacle for at least two first coupling elements 2, each of which, as previously described, has a first valve body 2.1.

[0044] As in Fig. 5As can be seen, the first coupling elements 2 interact with each other in such a way that the first valve bodies 2.1 are each lifted from their sealing seat 2.3, thus releasing the fluid channel 2.2.1. In particular, the end sections 2.1.1, which are provided at the free ends of the valve bodies 2.1, come into contact with each other. During the insertion movement, these exert a force on each other that is directed counter to the spring force of the springs 2.4, so that the valve bodies 2.1 are lifted from their sealing seat 2.3, thus releasing the fluid channel 2.2.1.

[0045] In both of the above-described embodiments, the at least one first coupling element 2 is secured in the second coupling element 3 by a plug-in insert 4. The plug-in insert 4 is inserted into the opening of the coupling section 3.5, into which the first coupling element 2 is also to be inserted. The plug-in insert 4 surrounds the part of the first coupling element 2 that is inserted into the coupling section 3.5 and thus secures the first coupling element 2 not only at one specific location, but also at a plurality of securing points evenly distributed around the circumference. This ensures secure securing, so that the coupled state of the plug-in coupling 1 is maintained even under high pressure.

[0046] As previously explained, the plug insert 4 serves to releasably fix the first coupling element 2 in the second coupling element 3. The plug insert 4 thus forms a coupling piece between the first coupling element 2 and the second coupling element 3.

[0047] A receiving space is formed inside the plug insert 4, into which the free end of the first coupling element 2 can be inserted and fixed, so that by fixing the plug insert 4 in the second coupling element 3 and by fixing the first coupling element 2 in the plug insert 4, the first coupling element 2 is releasably held in the second coupling element 3. To seal the transition between the first coupling element 2 and the second coupling element 3, a sealing element 5 is provided in the receiving space of the coupling section 3.5. The sealing element 5 can, as shown in the Fig. 1 to 5As shown, it may be designed as an O-ring. Alternatively, it is possible for the sealing element 5 to be designed as an elastomer molded part.

[0048] The plug-in insert 4 comprises a plug-in sleeve 4.1, a fixing element 4.2, and a release element 4.3. The plug-in sleeve 4.1 is hollow and forms, at least in sections, the circumferential wall of the plug-in insert 4. The plug-in sleeve 4.1 has an insertion opening at a first free end, in which the release element 4.3 is guided axially displaceably in the plug-in insert 4. Adjacent to the insertion opening, a through-channel is formed inside the plug-in sleeve 4.1, into which the first coupling element 2 can be inserted. The plug-in sleeve 4.1 can be constructed in several parts.

[0049] The fixing element 4.2 is accommodated inside the plug-in sleeve 4.1. The fixing element 4.2 is designed to anchor the first coupling element 2 in the axial direction in the plug-in insert 4. In the illustrated embodiment, the fixing element 4.2 is a ring-like element. On the outer circumference, the fixing element 4.2 is fixed in the plug-in sleeve 4.1 by a positive fit. In the illustrated embodiment, the edge region of the fixing element 4.2 provided on the outer circumference engages a bead provided on the inner circumference of the plug-in sleeve 4.1, whereby the fixing element 4.2 is held in the axial direction in the plug-in sleeve 4.1. Alternatively, a locking fixation of the fixing element in the plug-in sleeve 4.1 is also possible.

[0050] The fixing element 4.2 has a plurality of claws 4.2.1 on its inner edge. In other words, the fixing element 4.2 is designed as a claw ring. The claws 4.2.1 are arranged around a through-opening of the fixing element 4.2. The diameter of the through-opening is smaller than the outer diameter of the section of the first coupling element 2 that is inserted into the second coupling element 3, so that the claws 4.2.1 are deformed in the insertion direction when the first coupling element 2 is inserted and, after reaching a final insertion position, engage in the wall of the first coupling element 2. The fixing element 4.2 thus prevents the first coupling element 2 from undesirably detaching from the plug-in insert 4 and thus from the second coupling element 3.

[0051] The release member 4.3 is designed to release the engagement of the claws 4.2.1 of the fixing element 4.2 in the first coupling element 2, so that the first coupling element 2 can be pulled out of the plug-in insert 4 and thus out of the second coupling element 3. The release member 4.3 is preferably sleeve-shaped and has an insertion opening E and, inside, a through-channel through which the first coupling element 2 can be pushed.

[0052] The release element 4.3 is inserted into the plug-in sleeve 4.1 through the insertion opening. The free end of the release element 4.3 located in the plug-in sleeve 4.1 is designed to interact with the claws 4.2.1 of the fixing element 4.2, such that the free end of the release element 4.3 presses the claws 4.2.1 downward in the insertion direction upon axial insertion of the release element 4.3, thereby removing the engagement of the claws 4.2.1 in the wall of the first coupling element 2.

[0053] The release member 4.3 is displaceable in the insertion direction of the first coupling element 2 in the plug-in insert 4 in order to widen the claws 4.2.1 and thereby release the fixation of the first coupling element 2 caused by the fixing element 4.2.

[0054] The use of such a plug-in insert 4 for the releasable coupling of the first and second coupling elements 2, 3 enables secure fixation of the plug-in coupling 1 in the coupled state and, at the same time, a significant reduction in size compared to plug-in couplings in which a radially displaceable pushbutton is provided to secure the coupled state. Furthermore, plug-in inserts 4 can be manufactured in large quantities using automated processes, thus reducing the costs for the plug-in coupling. Furthermore, the second coupling element 3 can be rotationally symmetrical or substantially rotationally symmetrical in the region of the coupling section 3.5. This results in less distortion during the casting of the second coupling element 3, which is made, for example, of plastic.

[0055] According to a first embodiment, the plug-in insert 4 is designed, for example, as described in the applicant's own publication DE 10 2018 121 440 A1. The content of this publication is incorporated in its entirety into the present disclosure insofar as it relates to the design of the plug-in insert. The plug-in insert is referred to in this publication as a fixing means or clamping device. The Figures 1 to 5 The plug inserts 4 shown are designed, for example, according to the teaching of the document DE 10 2018 121 440 A1.

[0056] In this first embodiment, the plug-in sleeve 4.1 is divided into two parts, viewed in the insertion direction, namely a sleeve section and a support ring. The fixing element 4.2 is held between a shoulder of the sleeve section and the support ring. The support ring forms the free end of the plug-in sleeve 4.1 facing away from the release element 4.3 and thus an annular contact surface for the sealing element 5.

[0057] Figs. 6 and 7 show a second embodiment of a plug insert 4 which can be used in the plug-in coupling 1.

[0058] In this second embodiment, the plug insert 4 is designed according to the applicant's own European patent application with application number 22176919.3. The content of this patent application is incorporated in its entirety into the present disclosure.

[0059] The plug insert 4 according to the second embodiment is characterized in that the plug sleeve 4.1 is formed at least in sections from a metallic flat material by means of a punching and bending process.

[0060] The plug-in sleeve 4.1 has a sleeve section 4.1.1 and a collar section 4.1.5. The sleeve section 4.1.1 at least partially forms the wall of the plug-in sleeve 4.1 and circumferentially encloses the through-channel into which the first coupling element 2 is inserted. The sleeve section 4.1.1 is designed, for example, in the shape of a round tube in a first region that directly adjoins the first free end of the plug-in insert 4, into which the first coupling element 2 is inserted.

[0061] This first area is followed by a second area, where the bead 4.1.2 is formed by embossing the flat material on the inner circumference. The fixing element 4.2 is received by its outer edge in this bead 4.1.2 and is thus positively fixed in the sleeve section 4.1.1.

[0062] Adjoining the second region in the insertion direction of the first coupling element 2 is a third region in which the sleeve section 4.1.1 tapers conically toward the second free end. In other words, the wall of the sleeve section 4.1.1 tapers in a funnel shape in the third region. This centers the inserted first coupling element 2.

[0063] At the second free end of the plug-in sleeve 4.1 (the free end located further inward in the insertion direction of the first coupling element 2), a fourth region of the sleeve section 4.1.1 is provided, on which a flange 4.1.3 is formed. The flange 4.1.3 is formed, for example, by one or more radially outwardly projecting, flat material sections. The flange 4.1.3 lies in a plane that runs perpendicular to the insertion direction of the first coupling element 2.

[0064] The flange 4.1.3 can be circular or have several sections shaped like circular segments. The flange 4.1.3 forms a contact surface for the sealing element 5, which seals the transition between the first and second coupling elements 2, 3. The sealing element 5 can thus be held in position by the plug-in insert 4. In addition, the flange 4.1.3 can have a size and circumferential shape in the radial direction that is adapted to the recess formed in the second coupling element 3, into which the plug-in insert 4 is inserted, in such a way that the plug-in insert 4 is centered in the second coupling element 3 by the flange 4.1.3.

[0065] To fix the plug insert 4 in the coupling section 3.5 of the second coupling element 3, claws 4.1.6 are formed in the region of the second free end. The claws 4.1.6 are formed by tabs integrally formed on the sleeve section 4.1.1, which protrude obliquely upward with respect to the insertion direction and are designed to anchor the plug insert 4 in a recess of the second coupling element 3 after the plug insert 4 has been inserted into this recess, thus preventing the plug insert 4 from being accidentally removed from the second coupling element 3. The claws 4.1.6 can engage in a groove provided in the recess of the second coupling element 3. Alternatively, the claws 4.1.6 can be designed to anchor the plug insert 1 in the smooth wall of the recess of the second coupling element 3 (ie groove-free recess).

[0066] In the illustrated embodiment, a plurality of claws 4.1.6 are distributed circumferentially on the flange 4.1.3 of the plug-in insert 4 and arranged at a distance from one another. Depending on the diameter of the plug-in insert 4, for example, four, six or more claws 4.1.6 can be provided. A flange segment of the flange 4.1.3 is preferably provided between a pair of claws 4.1.6. This flange segment can preferably be designed in the shape of a circular ring segment. The flange segments serve, for example, to center the plug-in insert 4 in the second coupling element 3. Preferably, a base region of the claw 4.1.6 forms a contact area for the sealing element 5, so that the base regions of the claws 4.1.6, together with the flange segments located between the claws 4.1.6, jointly form the contact surface for the sealing element 5.

[0067] The sleeve section 4.1.1 is manufactured from one or more pieces of flat metal material using a punching, bending, and forming process. At least one piece of flat material is first punched. Subsequently, the material is formed, for example, by forming the bead 4.1.2 through a stamping process and / or by bending the flange 4.1.3 and the claws 4.1.6.

[0068] In the case of a single piece of material forming the sleeve section 5.1, this previously punched and formed piece of material is then bent into a tubular body so that the longitudinal sides of the piece of material are oriented toward each other and preferably abut against each other, forming a joint. At least partial welding can be performed at this joint.

[0069] In the event that the sleeve section 4.1.1 is formed by several pieces of material, as shown in Fig. 7As shown, the previously punched and formed pieces of material are then each bent into a shell-shaped wall element W1, W2. In the case of two wall elements W1, W2, these are half-shell-shaped. These can be identical or differently shaped, but are designed to match one another in such a way that after the shell-shaped wall elements W1, W2 are assembled, a circumferentially closed or essentially closed sleeve section 4.1.1 is formed. In the case of more than two wall elements, these each form a shell-shaped sector, wherein the sleeve section 4.1.1 is formed by assembling three or more of these shell-shaped sectors.

[0070] After assembling the wall elements W1, W2, at least partial welding can be performed at the joints. Preferably, the wall elements W1, W2 are welded at the joints in the area of ​​the flange 4.1.3. Alternatively or additionally, it is also possible for the wall elements W1, W2 to be held together in a form-fitting manner, for example, by means of interlocking dovetails.

[0071] Figs. 8 and 9 show a third embodiment of a plug insert 4 which can be used in the plug-in coupling 1.

[0072] In this third embodiment, the plug insert 4 is designed according to the applicant's own European patent application with application number 23152142.8. The content of this patent application is incorporated in its entirety into the present disclosure.

[0073] The plug insert 4 according to the third embodiment is characterized in that the plug sleeve 4.1 is formed from several plug sleeve elements 4.1A, 4.1B made of plastic, which can be assembled in such a way that they form a plug sleeve 4.1 with a circular cross-section.

[0074] As in the Figures 8 and 9As can be seen, the plug-in sleeve 4.1 is constructed in several parts, specifically composed of at least two plug-in sleeve elements W1, W2. The plug-in sleeve 4.1 is thus segmented in the circumferential direction. The embodiment shown has a first and a second plug-in sleeve element 4.1A, 4.1B. Preferably, the plug-in sleeve elements 4.1A, 4.1B are half-shell-shaped or substantially half-shell-shaped. In particular, the plug-in sleeve elements 4.1A, 4.1B can be identical parts, which simplifies the manufacture of the plug-in sleeve 4.1 and the assembly of the plug-in insert 4. The plug-in sleeve elements 4.1A, 4.1B can be assembled in such a way that, in the assembled state, a plug-in sleeve 4.1 that is closed on the circumference is formed.

[0075] The plug-in sleeve elements 4.1A, 4.1B preferably have connecting means 4.1.4, which are designed to fix the plug-in sleeve elements 4.1A, 4.1B to one another after assembly in such a way that unwanted disintegration of the resulting plug-in sleeve 4.1 is prevented. The connecting means 4.1.4 can be formed, for example, by a plug-in or snap-in connection, which secures the plug-in sleeve elements 4.1, 4.2 in their relative position after assembly. The connecting means 4.1.4 can be provided in particular on the joining surfaces of the plug-in sleeve elements 4.1A, 4.1B.

[0076] In the illustrated embodiment, the connecting means 4.1.4 are formed by tenon joints. At least one tenon joint is provided at each joining point of the plug-in sleeve 4.1. A tenon joint is formed by a recess and a tenon. In the illustrated embodiment, the plug-in sleeve elements 4.1A, 4.1B have a pair of tenons on a first joining surface and recesses corresponding to the tenons on a second, diametrically opposite joining surface.

[0077] The dimensions of the recesses and the pins are selected such that the pins can be inserted into the recesses with a precise but clamping fit. The dimensions of the recesses and the pins can be selected in particular such that the plug-in sleeve elements can be assembled without the use of tools. However, the fit of the recesses and the pins prevents unwanted loosening of the connection between the plug-in sleeve elements 4.1A, 4.1B.

[0078] The circumferential segmentation of the plug-in sleeve 4.1 allows the fixing element 4.2 to be inserted into a first plug-in sleeve element 4.1A, and only then can at least one further plug-in sleeve element 4.1B be placed on top and connected to the first plug-in sleeve element 4.1A. The release element 4.3 can either be inserted before the plug-in sleeve elements 4.1A, 4.1B are assembled or can be pressed into the plug-in sleeve 4.1 after they have been assembled.

[0079] The plug-in sleeve 4.1 preferably has a radially widened edge portion at the free end, where the opening for inserting the first coupling element 2 is provided. This edge portion spans the edge of the opening of the second coupling element 3 after the plug-in insert 4 has been inserted into the second coupling element 3. Adjoining the free end is a guide portion that forms a sliding guide for the release member 4.3. This guide portion guides the release member 4.3 axially without jamming (axially with respect to the insertion direction of the second coupling element 2).

[0080] Adjacent to the guide section in the insertion direction is an undercut with an edge. A locking section of the release element 4.3 interacts with this undercut. In particular, the undercut forms a contact surface for the locking section of the release element 4.3, thus preventing the release element 4.3 from being pushed out counter to the insertion direction of the first coupling element 2.

[0081] A bead 4.1.2 adjoins the undercut in the insertion direction of the first coupling element 2. The bead 4.1.2 positively receives the edge portion of the fixing element 4.2, so that the fixing element 4.2 is fixed after the plug-in sleeve elements 4.1A, 4.1B are assembled.

[0082] The plug-in sleeve 4 preferably has a conically tapered area adjacent to the bead 4.1.2 in the insertion direction. This creates a receiving space for the claws 4.2.1 protruding from the fixing element 4.2 and a free space for bending the claws 4.2.1 to release the engagement of the claws 4.2.1 in the wall of the first coupling element 2. Furthermore, the conically tapered area creates a widened contact surface for the sealing element 5 at the free end of the plug-in sleeve 4.1. This contact surface fixes the sealing element 5 in its position between the plug insert 4 and the second coupling element 3.

[0083] The plug-in sleeve 4.1 can either be held in the second coupling element 3 in a locking manner or can be designed in such a way that the plug-in insert 4 is held in the coupling section 3.5 in a force-locking manner after being pressed in.

[0084] The invention has been described above using exemplary embodiments. It is understood that numerous changes and modifications are possible without departing from the scope of protection defined by the patent claims. List of reference symbols

[0085] 1Plug-in coupling 2First coupling element 2.1First valve body 2.1.1End section 2.1.2Sealing element 2.2First coupling element housing 2.2.1Fluid channel 2.3Sealing seat 2.4Spring 3Second coupling element 3.1Second valve body 3.1.1End section 3.1.2Sealing element 3.2Second coupling element housing 3.2.1Fluid channel 3.3Sealing seat 3.4Spring 3.5Coupling section 4Plug insert 4.1Plug sleeve 4.1.1Sleeve section 4.1.2Bead 4.1.3Flange 4.1.4Connecting element 4.1.5Collar section 4.1.6Claws 4.1APlug sleeve element 4.1BPlug sleeve element 4.2Fixing element 4.3Release element 4.2.1Claws 5Sealing element Insertion opening W1Wall element W2Wall element

Claims

1. Plug-in coupling comprising a first coupling element (2) as a male coupling element and a second coupling element (3) as a female coupling element, the first coupling element (2) having a first valve body (2.1) and a first coupling element housing (2.2), the first valve body (2.1) being arranged in the first coupling element housing (2.2) so as to be movable in a spring-loaded fashion and, in the decoupled state of the plug-in coupling (1), bears due to the spring load against a sealing seat provided in the first coupling element housing (2.2), the second coupling element (3) having a second coupling element housing (3.2) with an opening into which the first coupling element (2) can be partially inserted, the opening of the second coupling element (3) having a plug insert (4) for releasably fixing the first coupling element (2) in the second coupling element housing (3.2), the plug insert (4) comprising a plug sleeve (4.1), a fixing element (4.2) and a release member (4.3) with an insertion opening, the fixing element (4.2) being designed for the releasable fixing of the first coupling element (2) inserted into the insertion opening in the plug insert (4) and the release member (4.3) cooperating with the fixing element (4.2) in such a way that an axial movement of the release member (4.3) relative to the plug sleeve (4.1) releases the fixing of the first coupling element (2), characterized in that the second coupling element housing (3.2) has at least one further opening in which a further plug insert (4) is provided for the fixing of a further first coupling element (2) as a male coupling element, the further plug insert (4) comprising a plug sleeve (4.1), a fixing element (4.2) and a release member (4.3) with an insertion opening, the fixing element (4.2) being designed for the releasable fixing of the further first coupling element (2) in the further plug insert (4) and the release member (4.3) cooperating with the fixing element (4.2) in such a way that an axial movement of the release member (4.3) relative to the plug sleeve (4.1) releases the fixing of the further first coupling element (2), and, when coupling the plug-in coupling (1), the valve bodies (2.1) of the male coupling elements (2) interact with one another in such a way that they are lifted from their sealing seat (2.3), thus enabling the fluid channel through the plug-in coupling (1).

2. Plug-in coupling according to any one of the preceding claims, characterized in that the release member (4.3) in the plug insert is movable parallel to the plug-in direction of the first coupling element (2).

3. Plug-in coupling according to any one of the preceding claims, characterized in that a sealing element (5) is provided in the opening of the second coupling element (3) which is fixed by the plug insert (4), the sealing element (5) being designed to seal the transition between the first and second coupling elements (2, 3) by surrounding the first coupling element (2) on the outer circumferential side.

4. Plug-in coupling according to any one of the preceding claims, characterized in that the fixing element (4.2) is a disk-shaped claw ring which has a plurality of reversibly bendable claws on the inner circumferential side for fixing the first coupling element (2).

5. Plug-in coupling according to any one of the preceding claims, characterized in that the plug sleeve (4.1) comprises a sleeve portion (4.1.1) which is formed from at least one wall element (W1, W2), the wall element (W1, W2) being formed by punching and bending a metallic flat material portion into an element which is shell-like or closed on the circumferential side, and the fixing element (4.2) being enclosed by the sleeve portion (4.1.1) and fixed in an interlocking manner in the sleeve portion (4.1.1).

6. Plug-in coupling according to claim 5, characterized in that the fixing element (4.2) is fixed at the edge in a bead (4.1.2) of the sleeve portion (4.1.1) of the plug sleeve (4.1) or is held in the plug sleeve (4.1) by means of a snap mechanism using axial pressing.

7. Plug-in coupling according to any one of claims 5 or 6, characterized in that the sleeve portion (4.1.1) is formed between a central region in which the fixing element (4.2) is held and a second free end of the plug sleeve (4.1) that is located opposite to the release member (4.3) so as to taper in a funnel-shaped fashion.

8. Plug-in coupling according to any one of claims 5 to 7, characterized in that the sleeve portion (4.1.1) has a flange (4.1.3) at a second free end of the plug sleeve (4.1) that is located opposite to the insertion opening in order to form a contact surface for the sealing element (5).

9. Plug-in coupling according to any one of claims 5 to 8, characterized in that the sleeve portion (4.1.1) has a flange (4.1.3) at a second free end opposite to the release member (4.3), which is provided with a plurality of claws (4.1.6) in a circumferentially distributed fashion in order to fix the plug sleeve (4.1) in the second coupling element housing (3.2).

10. Plug-in coupling according to any one of claims 1 to 4, characterized in that the plug sleeve (4.1) is formed from at least two plug sleeve elements (4.1A, 4.1B) adjoining one another in the circumferential direction and can be assembled by the adjoining plug sleeve elements (4.1A, 4.1B) to form a closed plug sleeve (4.1) which is circular in cross-section, the plug sleeve elements (4.1A, 4.1B) being made of a plastic material, and the plug sleeve (4.1) having in its interior space a bead (4.1.2) in which the fixing element (4.2) is fixed in an interlocking manner in the assembled state of the plug sleeve (4.1).

11. Plug-in coupling according to claim 10, characterized in that the plug sleeve elements (4.1A, 4.1B) can be fixed relative to one another by connecting devices (4.1.4) in the assembled state in such a way that they form the circumferentially closed plug sleeve (4.1) when acting together.

12. Plug-in coupling according to claim 11, characterized in that the connecting devices (4.1.4) comprise at least one pin connection and / or at least one snap-in connection.

13. Plug-in coupling according to any one of claims 10 to 12, characterized in that the plug sleeve (4.1) is segmented in the circumferential direction and not segmented in the axial direction.