Coupling assembly with valve

Abstract

The coupling sleeve (1) comprises a sleeve body (3) and a locator (7) for locking a coupling plug (2) in the sleeve body (3). The sleeve body has a connecting section (4) and a coupling section (6), which are fluidically connected to each other via an inner channel (8). A sleeve valve (10a) is arranged in the inner channel (8), and the sleeve valve (10a) comprises a valve holder (11a), an axially movable valve body (12a) and a valve seat (13a). The locator (7) comprises at least one locking element (25), and at least one locking element (25) is arranged to be resilient. At least one locking element (25) is designed to engage with the coupling plug (2).

Description

[0001] Related Applications

[0002] The present disclosure is a national phase application of European application 21201566.3 filed on October 8, 2021, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to a coupling sleeve for fluid coupling with a coupling plug, wherein the coupling sleeve comprises a sleeve body, wherein the sleeve body comprises a connection section and a coupling section, wherein the connection section is used to connect with a pipeline or a collection body, and the coupling section is used to couple with the coupling plug, wherein the coupling sleeve is designed so that the coupling plug can be inserted into the coupling sleeve, wherein the coupling sleeve has a locator, which is used to lock the coupling plug in the sleeve body, wherein the coupling section and the connection section of the sleeve body are fluidically connected to each other via an inner channel, wherein a sleeve valve is arranged in the inner channel, wherein the sleeve valve has a valve holder, an axially movable valve body and a valve seat, wherein the valve holder and the valve seat define the sleeve body or the valve section of the coupling sleeve in the axial direction, wherein the coupling sleeve is designed so that the valve body abuts against the valve seat in a fluid-tight manner in a locked state of the sleeve valve, and does not abut against the valve seat in an open state of the sleeve valve. The present invention also relates to a coupling plug and a coupling assembly comprising a coupling sleeve and a coupling plug. Background Art

[0004] The coupling sleeve of the type described at the beginning is known from DE 10 2004 026 209 B4 and is used to close the fluid path while releasing the coupling assembly. The retainer is configured as an axially movable and spring-loaded sleeve, which encloses the coupling body and fixes a closing ball distributed around the periphery of the coupling sleeve. In order to lock, the closing ball engages in a circumferential groove of the coupling plug. The coupling plug with a complementary design to the coupling sleeve comprises a substantially cylindrical coupling surface, which is arranged in a sealing section of the coupling sleeve in the locked state of the coupling plug. The sealing section has a sealing member in the form of a sealing ring, which is retained in the sealing section by means of a groove on the inner side of the sleeve body. The coupling surface of the coupling plug and the sealing ring of the coupling sleeve are sized so as to achieve a fluid-tight coupling between the coupling plug and the coupling sleeve.

[0005] The sleeve body in DE 10 2004 026 209 B4 comprises two sleeve body parts designed separately, specifically comprising an axially inward middle piece and an axially outward main piece. The middle piece and the main piece are connected to each other in a fluid-tight manner by means of a threaded connection and a sealing ring. The axially inward end section of the middle piece forms a connection section for a pipeline, while the axially outward end carries a valve retainer, a valve guide, a reset element and a valve body. The valve body of the middle piece reaches far into the interior of the main piece and hits the valve seat there. Therefore, the coupling sleeve is designed so that the valve retainer and the valve body can be inserted into the coupling sleeve in the axially outward direction. In contrast, the valve seat is an integrated part of the sleeve body or the main piece. The coupling plug or the plug body of the coupling plug is designed similarly to the sleeve body, and also comprises a main piece and an intermediate piece, and is also equipped with a valve, a plug-in valve. The two-part design of the sleeve body or plug body serves to make the internal valve holder easier to manufacture and is the core idea of ​​DE 10 2004 026 209 B4.

[0006] A disadvantage of the coupling sleeve and the known coupling plug known from DE 10 2004 026 209 B4 is that, when closing and releasing the coupling assembly, one hand must hold the coupling plug and the other hand must hold the coupling sleeve, while the sleeve must be pushed back against the spring force at the same time. In this respect, the known coupling assembly is somewhat cumbersome in terms of handling, which is a burden in particular in the narrow installation space of a motor vehicle. There, space is usually only available for one hand. Therefore, the object of the present invention is to provide a coupling sleeve and a coupling plug, which can be released from each other in a fluid-tight manner while requiring as little installation work as possible. Summary of the invention

[0007] The object is achieved by a coupling sleeve for fluid coupling with a coupling plug, wherein the coupling sleeve comprises a sleeve body, wherein the sleeve body comprises a connecting section and a coupling section, wherein the connecting section is used to be connected to a pipeline or to an aggregate, and the coupling section is used to couple with the coupling plug, wherein the coupling sleeve is designed so that the coupling plug can be inserted into the coupling sleeve, wherein the coupling sleeve has a locator, which is used to lock the coupling plug in the sleeve body, wherein the coupling section and the connecting section of the sleeve body are fluidly connected to each other via an inner channel, wherein the part of the inner channel corresponding to the coupling section, in a longitudinal cross section of the coupling sleeve, defines a central axis and an axial direction. direction and radial direction as well as circumferential direction, wherein the coupling section terminates with a coupling opening in an axially outward direction, wherein a sleeve valve is arranged in the inner channel, wherein the sleeve valve comprises a valve holder, an axially movable valve body and a valve seat, wherein the valve holder and the valve seat define the sleeve body or the valve section of the coupling sleeve in the axial direction, wherein the coupling sleeve is designed so that the valve body abuts against the valve seat in a fluid-tight manner in a locked state of the sleeve valve and does not abut against the valve seat in an open state of the sleeve valve, wherein the positioner comprises at least one locking element, wherein at least one locking element has a resilient elastic design, wherein at least one locking element is designed to engage with a coupling plug.

[0008] The present invention is based on the recognition that the locking mechanism from DE 10 2004 026 209 B4 has a disadvantageous design in terms of operation. It has been found that this disadvantage can be overcome when at least one locking element is a resilient elastic design, wherein at least one locking element is designed to engage with a coupling plug. Therefore, the present invention is characterized in that at least one locking element has both the function of locking and resetting. This allows the coupling plug to elastically deform at least one elastically deformable locking element when introduced into the coupling sleeve, and the deformation mode makes the locking element store the resetting energy while opening the circuit for the coupling plug. This eliminates the need for the spring disclosed in DE 10 2004 026 209 B4, because the function of the spring is realized in the locking element itself. As a result, it is no longer necessary to pull back the sleeve, so that the operation is simplified. In particular, this makes it possible to connect the coupling sleeve or the coupling plug with the corresponding other coupling elements with one hand when the corresponding other coupling elements are fixed. The coupling plug can be automatically locked in the coupling sleeve simply by axially joining the two coupling elements of the coupling assembly, thereby achieving the purpose mentioned at the outset.

[0009] In DE 10 2004 026 209 B4, the intermediate piece and the main piece of the sleeve body are connected to each other via a threaded connection. For this purpose, the intermediate piece has a hexagonal portion, which can be clamped with a tool, such as an open-end spanner or a socket spanner, so as to tighten the intermediate piece. Both the thread and the hexagonal portion indicate that the intermediate piece and the main piece are made of steel. The intermediate piece and the main piece cooperate with a closed ball, which to some extent gives the coupling sleeve a very stable shape and a very high-quality appearance. This product is advantageous, especially in the fields of laboratories, factories and workshop equipment, where professionals often use fluid couplings. An example is a fluid coupling for hydraulic tools or pneumatic tools. Fluid couplings in these places are usually not exposed to extremely narrow conditions in the engine compartment, so that the compactness or simplified operation problems proposed in DE 10 2004 026209 B4 do not even appear. In addition, there is no need for a coupling assembly that is trimmed to a high-quality appearance in this way in a motor vehicle. In contrast, if the coupling assembly described at the beginning is made of plastic, the locking element can be manufactured better, but this will at the same time deteriorate the appearance from a quality point of view in the eyes of professional users in laboratories and workshops. Therefore, the locking mechanism of the prior art mentioned at the beginning is well adapted to the rest of the coupling assembly.

[0010] Suitably, the terms "sleeve" and "plug" are understood to be complementary. The term "complementary" preferably means that the coupling plug can be inserted into the coupling sleeve in a fluid-tight manner. The term "pipe" preferably refers to rigid fluid lines and less rigid fluid lines, so as to also include, for example, hoses. The word "assembly" preferably refers to fluid components other than fluid lines, such as tanks, pumps, injection nozzles, etc.

[0011] The term "axially outward" preferably refers to the axial direction of the corresponding section of the coupling sleeve or coupling plug towards the coupling opening of the coupling sleeve or coupling opening of the coupling plug. Thus, the term "inward" or "inward" means the corresponding axial direction towards the front end of the connecting section of the coupling sleeve. In the case of a coupling plug, "axially inward" refers to the direction towards the front end of the joint section of the coupling plug.

[0012] The term "locked state" preferably refers to a state of the coupling assembly in which the retainer of the coupling sleeve has engaged with the locking element of the coupling plug. In the absence of a locked state, a released state of the coupling assembly is suitably present.

[0013] Particularly preferably, the coupling sleeve comprises a seal, wherein the seal is preferably designed as a sealing ring. The seal or sealing ring preferably comprises an elastomer. The seal or sealing ring is preferably arranged on the inner side of the sleeve body facing the inner channel. The seal or sealing ring is advantageously retained in a groove on the inner side of the sleeve body. Possibly, the groove on the inner side of the sleeve body is formed by a shoulder protruding radially inward. Advantageously, a seal retainer, in particular in the form of a seal retainer ring, is placed in the sleeve body and forms a wall of the sealing groove opposite to the shoulder. The sealing ring is preferably arranged between the valve seat and the locator in the axial direction. Very preferably, the sealing section is defined by an axial extension across the seal retainer and the valve seat. The sealing section is preferably arranged between the coupling section and the valve section of the sleeve body.

[0014] The coupling sleeve or coupling plug is preferably designed so that the valve holder and / or the valve body and / or the valve seat are inserted into the sleeve body / plug body in the axial inward direction. This is initially based on the recognition that the two-part design of the sleeve body or the plug body makes things complicated because the two parts must be manufactured separately and therefore two injection molding tools are required in the case of the preferred use of plastics. In addition, the fluid-tight connection requires very low tolerances, which also requires effort. The two parts will then have to be welded or locked to each other and additionally sealed via a sealing ring. It has been found that by inserting the valve into the sleeve body / plug body from the opposite direction-and therefore in the axial inward direction, this cost is reduced. This significantly reduces the effort required. In particular, it has been found that the cost reduction caused by the preferred one-piece design of the sleeve body or the plug body is greater than the cost caused by inserting a separate valve seat. This is because if the valve body is to be inserted in the axial inward direction and axially outwardly sealed at the same time, it is very preferred that the valve seat is inserted after the valve body. If the valve seat is already pre-inserted or even designed as one piece with the sleeve body / plug body, it is impossible or extremely difficult to bring the valve body through the valve seat to the intended position of the valve body. Therefore, by inserting the sleeve valve or plug valve in the axial inward direction, a coupling assembly can be formed which can be released in a fluid-tight manner, while requiring lower production costs.

[0015] According to one embodiment, the sleeve body / plug body has a one-piece design and is particularly preferably an integrated design. The term "one-piece" preferably refers to a sleeve body or plug body that can only be disassembled into multiple parts irreversibly and therefore only destructively. For example, a welded connection between two plastic parts constitutes an irreversible connection and is therefore a one-piece element. The term "integrated" refers in particular to those elements that are manufactured from a single material in a single injection molding process. It is particularly preferred that the sleeve body or plug body comprises plastic and preferably consists only of plastic.

[0016] The sleeve body or plug body can have a multi-piece configuration and have at least two sleeve body parts or plug body parts or a main part and an intermediate part. In certain fluid systems, it is advantageous that the main part can be combined with a plurality of variants of the intermediate part. The two sleeve body parts / plug body parts can be irreversibly connected to each other via welding. According to one embodiment, at least two sleeve body parts / plug body parts can be mechanically connected to each other by a locking connection or by a force fit, and are preferably connected fluid-tightly at the connection point by at least one sealing ring.

[0017] The sleeve body can be designed to be angled or straight. A sleeve body with a straight design preferably means that the center axis of the coupling section is coaxial or identical to the longitudinal axis of the connecting section. The term "angled sleeve body" is suitably understood to mean that the longitudinal axis of the connecting section extends at an angle relative to the center axis of the coupling section in a longitudinal section of the sleeve body. It is very preferred that the sleeve body complies with the VDA standard or the SAE standard for fluid couplings.

[0018] It is particularly preferred that the valve seat is a component manufactured separately from the sleeve body. The valve seat is suitably not designed in an integral manner with the sleeve body. The valve seat preferably comprises plastic, and further preferably comprises only plastic. The valve seat is particularly preferably designed to be annular, and further preferably designed to be circular. The valve seat can be inserted into the sleeve body by force fit and / or form fit and / or material fit. The valve seat is advantageously locked or clamped into the sleeve body. It is very advantageous that the sleeve body has a radially inwardly protruding ridge, which the valve seat hits in the axial inward direction when inserted into the sleeve body. It is very advantageous that the valve seat abuts against the radially inwardly protruding ridge, and is preferably connected or fastened to the latter. The ridge suitably defines the axial position of the valve seat. Advantageously, the valve seat is arranged between the valve retainer and the seal or sealing ring in the axial direction. The effect of manufacturing the valve seat separately from the sleeve body is that the valve seat can be subsequently inserted into the sleeve body. As a result, the remaining valve components can first be inserted from the coupling opening into the valve section of the sleeve body in order to subsequently or finally insert the valve seat into the sleeve body. As a result, the sleeve valve does not have to be inserted from the connection section into the sleeve body, so that the sleeve body as a whole can be manufactured as a one-piece part and even as an integrated part. This ensures lower production costs during the manufacture of the sleeve body and also ensures greater stability and finally also fluid tightness of the coupling sleeve.

[0019] The sleeve body or the plug body particularly preferably comprises a radially inwardly protruding projection, to which the valve holder is connected or fastened. It is very preferred that the valve holder is designed separately from the sleeve body or the plug body. The valve holder advantageously comprises plastic, and preferably only comprises plastic. It is very advantageous that the valve holder strikes or abuts against the projection in the axial inward direction. The valve holder is advantageously connected or fastened to the projection via force fit and / or form fit and / or material fit. As a form fit fastening, locking is particularly considered. For example, a force fit connection can be achieved by a radially acting press fit. As a material fit, welding, in particular laser welding, is particularly considered. The effect of manufacturing the valve holder separately from the sleeve body or the plug body is that it makes the injection molding of the sleeve body or the plug body much easier. In addition, the valve guide can then be inserted into the valve holder outside the sleeve body or the plug body, thereby slightly simplifying assembly at this point.

[0020] The valve holder of the sleeve body or the plug body advantageously has a guide passage. The guide passage is preferably arranged in the radial inner region of the valve holder. The guide passage is suitably designed so that the valve guide or the guide foot of the valve guide can slide through the guide passage in the axial direction. The valve holder suitably comprises a ring, which is preferably arranged in the radial outer region of the valve holder. Preferably, the ring of the valve holder abuts against the inner side of the sleeve body. In particular, the ring of the valve holder can have at least one locking element, which is used to lock in the sleeve body or the plug body. The ring and the guide passage are preferably connected to each other in the radial direction by at least two / three / four pillars of the valve holder. Preferably, when viewed in the axial direction toward the valve holder, the window allowing the fluid to pass through is arranged between the pillars. Advantageously, the valve holder is arranged between the connecting section and the valve seat. This feature defines the working direction of the sleeve valve or the plug valve so that the valve body works and seals appropriately in the axial outward direction.

[0021] The inner diameter of the connecting section is advantageously smaller than the inner diameter of the valve section and / or smaller than the inner diameter of the sealing section and / or the inner diameter of the coupling section. The inner diameter of the valve section is preferably smaller than the inner diameter of the sealing section and / or the inner diameter of the coupling section. The inner diameter of the sealing section is suitably smaller than the inner diameter of the coupling section. The effect of this feature or these features is that this forms a particularly compact sleeve body while ensuring a low flow resistance. In addition, the different inner diameters allow a step to be formed on the inner side of the sleeve body, against which the valve holder and / or the valve seat can rest for stability purposes.

[0022] According to a very preferred embodiment, the valve body of the coupling sleeve or the coupling plug has a section that expands in the axial outward direction and a section that tapers in the axial outward direction in a longitudinal section. Preferably, the section that expands in the axial outward direction coincides at least partially with the rear surface of the valve body. The term "rear surface" preferably means the visible surface of the valve body viewed axially outward. The section of the valve body that tapers in the axial outward direction coincides at least partially with the sealing surface. The sealing surface is preferably a circular section of the front surface of the valve body, which abuts against the valve seat in the locked state of the sleeve valve. The effect of the expanded section and the tapered section is that the valve body is designed to have the lowest possible flow resistance. The expanded section and the tapered section can correspondingly have a conical design, but can also have a rounded design in the longitudinal section.

[0023] It is very particularly advantageous that the valve body comprises plastic and further preferably comprises an elastomer. The elastomer is preferably a rubber or a thermoplastic elastomer. It is very particularly preferred that the elastomer forms the sealing surface of the valve body. The effect of the elastomer is in particular that it achieves a particularly good seal between the valve body and the valve seat. It is very preferred that the valve body consists only of an elastomer. The valve body advantageously has a one-piece design and in particular an integrated design. The valve guide is advantageously fastened to the valve body by means of a force fit between the valve guide and the valve body. According to one embodiment, the valve body comprises an elastomer and a further plastic. The further plastic preferably has a greater hardness. The elastomer advantageously surrounds the further plastic at least partially in the axial direction and / or in the radial direction. The further, harder plastic preferably forms a supporting structure, such as a rib, a pillar, etc.

[0024] The valve body of the sleeve valve preferably comprises a guide receptacle on its rear side or on its front side facing the valve holder, which guide receptacle is used to partially accommodate the valve guide or the valve guide head. Preferably, the guide receptacle is designed to at least partially accommodate the reset element. The valve body of the sleeve valve is advantageously arranged in the axial direction between the valve holder and the sealing element or the coupling opening. It is very advantageous that in the locked state of the sleeve valve, the valve body is partially, in particular only partially, arranged between the valve holder and the valve seat.

[0025] The locator particularly preferably comprises at least two locking elements. At least one locking element is advantageously designed so that it can be deformed, in particular deformed by the coupling plug, while storing reset energy. It is particularly preferred that at least one locking element releases the stored reset energy again when the coupling plug is fully introduced and returns to the undeformed state. It is very preferred that at least two locking elements are connected to each other as one piece, and preferably in an integrated manner. The locator advantageously has a one-piece design, and further preferably has an integrated design. The locator can be configured as a U-shape or a ring. It is very preferred that the locator is movably mounted on the sleeve body. For the purpose of locking to the coupling plug, the locking element is preferably movable in the radial direction. It is very preferred that the locking element is designed to be movable in the radial direction so that the engagement on the coupling plug can be released. The locator can include metal and / or plastic. The effect of the one-piece locator feature is to reduce manufacturing costs thereby. This feature has additional advantages in terms of compactness and anti-loss.

[0026] The sleeve valve or plug-in valve expediently has a restoring element, preferably a spring, and further preferably a helical spring, wherein the restoring element exerts a force on the valve body, preferably in the direction of the valve seat. The restoring element is advantageously arranged between the valve holder and the valve body. The restoring element is preferably mounted or supported on the valve holder. The restoring element is preferably mounted on the valve body or is accommodated in the valve body. Very preferably, in the locked state of the sleeve valve or plug-in valve, the restoring element presses with its axially outward end against the valve body and with its axially inward end against the valve holder.

[0027] It is very preferred that the sleeve valve or plug valve comprises a valve guide, wherein the valve guide defines the direction of movement of the valve body, wherein preferably the valve body at least partially surrounds the valve guide in the axial direction and at least partially in the radial direction. Preferably, the valve body at least partially surrounds the valve guide in the axial direction and completely circumferentially in the radial direction. In contrast, DE 10 2006 008 291 B4 discloses that the inner side of the sleeve body forms a valve guide for the valve body. Therefore, in this prior art, the valve body does not surround the valve guide, but the valve guide surrounds the valve body. The effect of the valve body surrounding the valve guide is that the valve body can be designed to be elastic. If the valve body has an elastic design and slides along the inner side of the sleeve body or plug body at the same time, the friction forces will be too large.

[0028] The valve guide of the sleeve valve or the plug-in valve advantageously has a rail-like design or a rod-like design. The valve guide preferably comprises an axially outwardly directed guide head and an axially inwardly directed guide foot. Preferably, the guide head of the valve guide is arranged or fastened on the valve body and preferably arranged or fastened in the valve body. It is particularly preferred that the guide foot is mounted to slide in the axial direction in the valve holder or in the guide passage of the valve holder. In order to improve the fastening on the valve body or in the valve body, the guide head can be designed to protrude in the radial direction.

[0029] According to a very preferred embodiment, the valve body of the sleeve valve or plug-in valve has an axially outward front end, wherein the axially outward front end preferably comprises a flat pressure surface, wherein the flat pressure surface preferably lies in a plane perpendicular to the central axis or the middle axis. The central axis or the middle axis advantageously extends through the pressure surface and further preferably through the midpoint of the pressure surface. In a front view of the valve body, the pressure surface can be designed to be circular, but can also have a polygonal and asymmetrical configuration. The effect of the flat pressure surface is in particular that the valve bodies stably support each other in the locked state of the coupling assembly.

[0030] It is very preferred that the pressure surface of the sleeve valve or the plug-in valve is the surface of the valve body that is located most axially outward. In a front view of the valve body, the pressure surface is preferably the radially innermost surface of the valve body. It is very particularly preferred that, in the locked state of the sleeve valve or the plug-in valve, the pressure surface of the valve body bulges outwardly in the axial direction relative to the valve seat. The effect of this feature is that a pressure contact with a valve body of the same structure of the corresponding other coupling element is made possible, so that one and the same valve body can be used for both coupling elements and in particular valve bodies of mutually complementary design are not required. It is preferred that the surface of the valve body that expands in the axial inward direction in the longitudinal section abuts the pressure surface indirectly or directly in the axial direction and / or in the radial direction.

[0031] Particularly preferably, the axial position of the valve body of the sleeve valve in the locked state of the sleeve valve is located axially further outward relative to the axial position of the valve body in the open state of the sleeve valve. This allows the two valves to actuate each other. According to a preferred embodiment, in the locked state of the sleeve valve and / or in the open state of the sleeve valve, the valve body of the sleeve valve is completely located outside the connecting section. The effect of the valve body being completely arranged outside the connecting section is to achieve a smaller flow resistance in the connecting section or a more compact connecting section. Preferably, in the locked state of the sleeve valve, the valve body of the sleeve valve partially protrudes into the sealing section in the axial direction.

[0032] Preferably, the fluid line has the coupling sleeve and the pipeline described above, wherein the pipeline is preferably plugged onto the connecting section or plugged into the connecting section. The connecting section is suitably designed so that the pipeline can be plugged onto the connecting section or plugged into the connecting section. The connection of the pipeline and the connecting section can be achieved by form fit and / or force fit and / or material fit. For example, the connection by force fit can be established by radially widening the pipeline when it is pushed onto the connecting section, thereby realizing a press fit. For example, by making the connecting section have at least partially circumferential ribs, force fit can be further improved. For example, material fit can be achieved by means of welding, particularly laser welding or friction welding. In particular, form fit can be produced by an internal groove in the pipeline. According to a preferred embodiment, the pipeline is inserted into the connecting section and is fastened to the connecting section in a material fit manner via welding, particularly laser welding. Another preferred embodiment relates to plugging the pipeline onto the connecting section, wherein the connecting section has at least one circumferential rib on its outside.

[0033] It is particularly preferred that the coupling sleeve or the coupling plug has a flow-optimized design, since the sleeve valve or the plug-in valve causes considerable flow resistance. Advantageously, in a longitudinal section of the coupling sleeve or the coupling plug, the side of the valve seat of the sleeve valve or the plug-in valve facing the valve holder widens in the axial inward direction, preferably in a rounded manner. Very preferably, in a longitudinal section, the axially inward front end side of the valve guide of the sleeve valve or the plug-in valve tapers in the axial inward direction, preferably in a rounded manner. Very preferably, in the open state of the sleeve valve or the plug-in valve, the tapered front end side of the valve guide of the sleeve valve or the plug-in valve is flush with the valve holder.

[0034] The objects mentioned at the outset are achieved by a coupling plug for fluid coupling with a coupling sleeve, in particular with a coupling sleeve according to the present invention, wherein the coupling plug comprises a plug body, wherein the plug body comprises a joint section and a coupling surface, wherein the joint section is used to be connected to a pipe or an aggregate, and the coupling surface is used to couple with the coupling sleeve, wherein the coupling plug is designed so that the coupling sleeve can be plugged onto the coupling plug, wherein the coupling plug has a locking element, which is used to lock the coupling plug in the coupling sleeve, wherein the joint section and the axial sections of the plug body corresponding to the coupling surface are fluidically connected to each other via a fluid channel, wherein the part of the fluid channel corresponding to the coupling surface defines a middle axis as well as an axial direction and a radial direction as well as a circumferential direction in a longitudinal section of the coupling plug, wherein a coupling surface is terminated by a coupling opening in an axially outward direction, wherein an insert valve is arranged in a fluid channel, wherein the insert valve comprises a valve holder, an axially movable valve body and a valve seat, wherein the valve holder and the valve seat define a valve section of a plug body or a coupling plug in an axial direction, wherein the coupling plug is designed such that the valve body abuts the valve seat in a fluid-tight manner in a locked state of the insert valve and does not abut the valve seat in an open state of the insert valve, characterised in that the coupling plug is designed such that the valve holder and / or the valve body and / or the valve seat can be or are inserted into the plug body in an axially inward direction, wherein the axial position of the valve body in the locked state of the insert valve is axially further outward relative to the axial position of the valve body in the open state of the insert valve.

[0035] Preferably, the plug body has an intermediate section. The intermediate section is suitably located between the joint section and the valve section. The plug body advantageously includes a locking element. The locking element is preferably designed to lock the coupling plug in the coupling sleeve with a locator of the coupling sleeve. Preferably, the locking element or the locator is designed so that the coupling plug can be releasably locked in the coupling sleeve. The locking element may have at least one edge, by means of which the coupling plug is locked to the locking element of the coupling sleeve. The edge may be a part of a shoulder, a circumferential hoop or a groove of the plug body. The locking element is preferably configured as a shoulder, a circumferential hoop and / or a groove.

[0036] Advantageously, the coupling surface is at least partially cylindrical. Preferably, the coupling surface of the coupling plug is designed to be complementary to the sealing section or to the seal of the coupling sleeve. The plug body preferably comprises a tapered portion. The tapered portion is preferably designed such that, by introducing the coupling plug into the coupling sleeve, the tapered portion deforms or tensions at least one locking element of the coupling sleeve or elastically separates two locking elements. The tapered portion is advantageously located between the coupling surface and the locking element.

[0037] The plug body preferably includes at least one insurance portion, and preferably includes two insurance portions. At least one insurance portion is suitably designed to engage with the insurance element of the coupling sleeve to prevent twisting. Preferably, the two insurance portions are arranged exactly opposite each other relative to the intermediate axis. Preferably, the at least one insurance portion is arranged between the joint section and the coupling surface or the tapered portion or the locking element in the axial direction. The plug body preferably includes a flange. The flange is preferably arranged between the coupling surface and the joint section. The flange extends from the joint section to at least one insurance portion in a radial direction. The plug body is preferably designed so that the flange is used as a stopper, which is used for the fluid element pushed onto the joint section, particularly for a pipeline.

[0038] The plug body can be designed to be angled or straight. A plug body with a straight design preferably means that the central axis of the valve section or the part of the plug body belonging to the coupling surface is coaxial or identical with the longitudinal axis of the joint section. The term "angled plug body" is appropriately understood to mean that the longitudinal axis of the joint section extends at an angle relative to the central axis of the valve section or relative to the part of the plug body belonging to the coupling surface in the longitudinal section of the plug body. It is very preferred that the plug body conforms to the VDA standard or the SAE standard for fluid couplings.

[0039] It is particularly preferred that the valve seat is a component manufactured separately from the plug body. The valve seat is suitably not designed in an integrated manner with the plug body. The valve seat preferably comprises plastic, and further preferably comprises only plastic. The valve seat is particularly preferably annular, and further preferably circular. The valve seat can be inserted into the plug body by force fit and / or form fit and / or material fit. The valve seat is advantageously locked into or clamped into the plug body. It is very advantageous that the plug body has a radially inwardly protruding ridge, and the valve seat hits the ridge in the axially inward direction when inserted into the plug body. It is very advantageous that the valve seat abuts against the radially inwardly protruding ridge, and is preferably connected or fastened to the latter. The ridge suitably defines the axial position of the valve seat. It is advantageous that the valve seat is arranged on the axially outward end of the plug body. The valve seat preferably forms the axially outward front end face of the coupling plug. The valve seat preferably closes the axially outward end of the plug body or the coupling plug. The valve seat advantageously defines the inner diameter of the coupling opening. The effect of manufacturing the valve seat separately from the plug body is that the valve seat can then be subsequently inserted into the plug body. As a result, the remaining valve components can first be inserted from the coupling opening into the valve section of the plug body so that the valve seat can be subsequently or finally inserted into the plug body. As a result, the plug valve does not have to be inserted from the connector section into the plug body, so that the plug body as a whole can be manufactured in one piece and can even be manufactured as an integrated part. This ensures lower production costs when manufacturing the plug body and, in addition, ensures greater stability and, finally, also fluid tightness of the coupling plug.

[0040] The inner diameter of the connector section is advantageously smaller than the inner diameter of the middle section and / or the inner diameter of the valve section. The inner diameter of the middle section is preferably smaller than the inner diameter of the valve section. The effect of this feature or these features is that a particularly compact plug body is thereby formed, while ensuring a low flow resistance. Furthermore, the different inner diameters provide the possibility of forming a step on the inner side of the plug body, against which the valve holder and / or the valve seat can rest for stabilization purposes.

[0041] The valve body of the plug-in valve preferably comprises a guide receptacle on its rear side or on its front side facing the valve holder, which guide receptacle is used to partially accommodate the valve guide or the valve guide head. Preferably, the guide receptacle is designed to at least partially accommodate the reset element. It is very advantageous if, in the locked state of the plug-in valve, the valve body of the plug-in valve is arranged partially, in particular only partially, between the valve holder and the valve seat.

[0042] Particularly preferably, the axial position of the valve body of the plug-in valve in the locked state of the plug-in valve is located axially further outwards relative to the axial position of the valve body in the open state of the plug-in valve. This allows the two valves to actuate each other. According to a preferred embodiment, in the locked state of the plug-in valve and / or in the open state of the plug-in valve, the valve body of the plug-in valve is completely outside the joint section. The effect of the valve body being completely arranged outside the joint section is that a lower flow resistance is achieved in the joint section or a more compact joint section is achieved.

[0043] Preferably, the fluid line has the coupling plug described above and the pipeline, wherein the pipeline is preferably plugged onto the joint section or plugged into the joint section. The joint section is suitably designed so that the pipeline can be plugged onto the joint section or plugged into the joint section. The connection of the pipeline and the joint section can be realized by form fit and / or force fit and / or material fit. For example, the connection by force fit can be established by radially expanding the pipeline when it is pushed onto the joint section, thereby realizing press fit. For example, by making the joint section have at least part of the circumferential rib, force fit can be further improved. For example, material fit can be realized by means of welding, particularly laser welding or friction welding. In particular, form fit can be produced by the internal groove on the pipeline. According to a preferred embodiment, the pipeline is inserted into the joint section and is fastened to the joint section in a material fit manner via welding, particularly laser welding. Another preferred embodiment relates to plugging the pipeline onto the joint section, wherein the joint section has at least one circumferential rib on its outside.

[0044] The objects mentioned at the outset are achieved by a coupling assembly comprising a coupling sleeve and a coupling plug, wherein the coupling sleeve is preferably designed according to the invention, wherein the coupling plug is preferably designed according to the invention, wherein the coupling plug is designed to be complementary to the coupling sleeve and can be inserted into the coupling sleeve in a fluid-tight manner, wherein the coupling assembly is designed such that the coupling plug can be releasably fixed in the coupling sleeve, wherein the coupling sleeve has a sleeve valve and the coupling plug has a plug-in valve, wherein the coupling assembly is designed such that the sleeve valve and the plug-in valve each change from a locked state to an open state when the coupling plug is inserted into the coupling sleeve.

[0045] The objects mentioned at the outset are achieved by a method for connecting a coupling sleeve and a coupling plug of a coupling assembly, the coupling assembly comprising a coupling sleeve and a coupling plug, wherein the coupling sleeve is preferably designed according to the invention, wherein the coupling plug is preferably designed according to the invention, wherein the coupling plug is designed to be complementary to the coupling sleeve and can be inserted into the coupling sleeve in a fluid-tight manner, wherein the coupling assembly is designed so that the coupling plug can be releasably fixed in the coupling sleeve, wherein the coupling sleeve has a sleeve valve and the coupling plug has a plug-in valve, wherein the coupling assembly is designed so that when the coupling plug is inserted into the coupling sleeve, the sleeve valve and the plug-in valve each transition from a locked state to an open state.

[0046] The object mentioned at the outset is achieved by the use of the coupling sleeve according to the invention and / or the coupling plug according to the invention in a vehicle, in particular an electric vehicle, preferably for fluid cooling and particularly preferably for fluid cooling of a battery of an electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The invention will be explained in more detail below based on exemplary embodiments with the aid of six figures.

[0048] Figure 1 is a perspective view of a coupling sleeve according to the present invention,

[0049] Figure 2 is through according to Figure 1 A longitudinal cross-sectional view of the coupling sleeve,

[0050] Figure 3 is based on Figure 2 Exploded view of the valve coupled to the casing,

[0051] Figure 4 is a perspective view of a coupling plug according to the present invention,

[0052] Figure 5 is through according to Figure 4 A longitudinal cross-sectional view of the coupling plug, and

[0053] Figure 6is a longitudinal cross-sectional view through a coupling assembly according to the invention, the coupling assembly comprising Figure 2 The coupling sleeve and according to Figure 5 coupling plug. DETAILED DESCRIPTION

[0054] Figure 1 The coupling sleeve 1 according to the present invention comprises a sleeve body 3 and a locator 7, which are preferably integrated. The locator 7 in the exemplary embodiment is made of wire and preferably has a substantially U-shaped configuration. In the exemplary embodiment, the locator 7 and the sleeve body 3 are designed to comply with the VDA standard for fluid couplings. In other exemplary embodiments not shown, the locator and the sleeve body can comply with the SAE standard, for example. The sleeve body 3 has a coupling section 6, which is axially delimited to the outside by a coupling opening 9. The locator 7 is advantageously arranged in the coupling section 6.

[0055] The sleeve body 3 also comprises a connecting section 4 which may for example have circumferential barbed ribs which provide a good force fit with the pipe 5 to be plugged (see Figure 2 ). However, in other exemplary embodiments not shown, the connecting section can also be designed such that the pipe can be inserted into the connecting section and fastened to the connecting section, for example via laser welding. The coupling sleeve 1 and the pipe 5 can together form a fluid line 1, 5. Preferably, the pipe 5 and / or the sleeve body 3 have plastic and are preferably completely made of plastic.

[0056] In this exemplary embodiment, the retainer 7 has a base 26 and preferably also two locking elements 25, which are advantageously designed as two legs. The base 26 and the locking elements 25 together preferably form a U-shape of the retainer 7. In other exemplary embodiments, the retainer can also be configured as a completely annular and therefore annular. In this exemplary embodiment, the base 26 is mounted between two flanges on the outside of the sleeve body, and when the retainer 7 is fully introduced into the sleeve body 3, the two locking elements 25 are arranged in corresponding recesses 27 of the sleeve body 3. For example, the ends of the locking elements 25 can extend in the axial direction and can be accommodated by corresponding leg receptacles 31 of the sleeve body 3.

[0057] The sleeve body 3 preferably includes at least one safety element 28, and preferably includes two safety elements 28. The safety element 28 in this exemplary embodiment is configured as a groove-shaped receptacle and serves as a Figure 4 and Figure 5For this purpose, the coupling plug 2 preferably has one or two safety parts 29, which engage in the safety element 28 in a complementary manner, and therefore preferably in a spring-like manner, when the coupling plug 2 is introduced into the coupling sleeve 1.

[0058] See also Figure 1 Preferably, the outer diameter of the sleeve body 3 decreases more and more from the coupling section 6 in the direction of the connecting section 4, and preferably decreases in a step-like manner. Figure 2 The connection section 4 to the rest of the sleeve body 3 is delimited by a flange 46 which advantageously serves as a stop for the pipe 5 .

[0059] according to Figure 2 , the connecting section 4 and the coupling part 6 are fluidly connected to each other through the inner channel 8. When the coupling plug 2 is inserted, the seal 32 abuts against the outer side of the coupling plug 2 in a force-fitting manner (see in particular Figure 6 ), so that the inner cavity of the coupling plug 2 and the inner cavity of the coupling sleeve 1 are fluidically sealed from the outside. The coupling sleeve 1 advantageously comprises a seal retainer 33, which is preferably fastened in the sleeve body 3 as a separate ring for fixing the seal 32. Fastening can be performed in particular by locking the seal retainer 33 into the inner side of the sleeve body 3.

[0060] exist Figure 2 In the longitudinal section of the inner channel 8, the part corresponding to the coupling section 6 has a center axis M. The center axis M defines the axial direction as well as the radial direction and also defines the circumferential direction. Directional information always refers to the corresponding section appropriately, so that the axial direction of the connecting section can be a different direction from the axial direction of the coupling section, and this is also the case in this exemplary embodiment. The axial direction is distinguished below as an axial inward direction, which extends toward the pipe 5 or the connecting section 4. Therefore, the axial outward direction is to be understood as the direction toward the coupling opening 9.

[0061] According to the invention, the coupling sleeve 1 comprises a sleeve valve 10a, which is arranged in the sleeve body 3 or is placed in the latter. The sleeve valve 10a comprises a valve holder 11a, an axially movable valve body 12a and a valve seat 13a. The sleeve valve 10a preferably also has a valve guide 20a and a reset element 21a. The reset element 21a in this exemplary embodiment is configured as a coil spring, while the valve guide 20a preferably has a rod-shaped design or a bolt-shaped design. The valve body 12a preferably comprises plastic, further preferably comprises an elastomer, and very particularly preferably comprises a thermoplastic elastomer. In contrast, the valve seat 13a can have a harder plastic than the valve body 12a. Advantageously, the valve seat 13a is configured like a washer and can be locked into the sleeve body 3.

[0062] Figure 3 The structure of the sleeve valve 10a is further illustrated. Therefore, the valve body 12a preferably has a pressure surface 23a, which constitutes the axially outward front end of the valve body 12a (see also Figure 2 ). In this exemplary embodiment, the pressure surface 23a is followed by a section that widens in the axially inward direction, which section preferably partially bears against the valve seat 13a with the sealing surface 22a in the locked state of the sleeve valve 10a. The sealing surface 22a in this exemplary embodiment is a partial section of the axially inwardly widened section of the valve body 12a. Figure 2 and Figure 3 It can be seen in FIG. 1 that, in further axial inward direction, the valve body 12a has a rear side 42a which has a section which tapers in longitudinal section, so that the valve body 12a in this exemplary embodiment is substantially rhombus-shaped in longitudinal section.

[0063] On the front side located opposite to the pressure surface 23a, according to Figure 2 and Figure 3 The valve body 12a advantageously has a guide receptacle 35a for the valve guide 20a and, appropriately, also for the reset element 21a. In order to securely fasten the valve guide 20a in the valve body 12a or in the guide receptacle 35a of the valve body 12a, the valve guide 20a can have an advantageously protruding guide head 36a. For example, the guide head 36a can have a substantially T-shaped configuration. The valve body 12a advantageously has an elastic design so that it can accommodate the guide head 36a in a locking or force-fitting manner. Figure 2As can be seen in particular in FIG, the reset element 21a partially surrounds the valve guide 20a in this exemplary embodiment. The axially outward end of the reset element 21a is preferably mounted in the valve body 12a, wherein the axially inward end of the reset element 21a is preferably supported on the valve holder 11a. The valve holder 11a is advantageously fastened to a radially inwardly protruding protrusion 43a of the sleeve body 3 and is preferably locked into the protrusion 43a. The valve seat 13a is preferably fastened to a radially inwardly protruding ridge 47a of the sleeve body 3 and is preferably locked into the ridge 47a.

[0064] exist Figure 3 In the perspective view, the valve holder 11a can be particularly clearly seen. The valve holder 11a advantageously has a guide passage 38a, in which the guide foot 37a of the valve guide 20a is axially movably mounted. This axial movability of the valve guide 20a is particularly evident by comparing Figure 2 and Figure 6 The valve holder 11a may have a ring 41a, which is used to fasten the valve holder 11a in the sleeve body 3, for example by locking. Preferably, the valve holder 11a has a support 39a, which connects the ring 41a with the guide passage 38a. The support 39a simultaneously forms a window 40a through which the fluid can flow. However, due to the respective selected perspective view, the window 40a is not Figure 3 is visible, but in Figure 2 Not visible.

[0065] The valve holder 11a and the valve seat 13a define a valve section 24a. Figure 2 . In the exemplary embodiment, the valve section 24a is delimited in the axially outward direction by a sealing section 34, wherein the sealing section 34 is preferably determined by the valve seat 13a and the seal holder 33. The sealing section 34 is suitably arranged between the coupling section 6 and the valve section 24a. In the exemplary embodiment, the coupling sleeve 1 has an angled configuration so that the longitudinal axis of the connecting section 4 is angled relative to the center axis M. Therefore, in the exemplary embodiment, a turning section 44 is arranged between the connecting section 4 and the valve section 24a. In other exemplary embodiments, the longitudinal axis of the connecting section is oriented coaxially with the center axis M, so that the turning section 44 is omitted in these exemplary embodiments.

[0066] Preferably, the inner diameter of the connecting section 4 is smaller than the inner diameter of the valve section 24a. The inner diameter of the valve section 24a is preferably smaller than the inner diameter of the sealing section 34. Preferably, the inner diameter of the sealing section 34 is smaller than the inner diameter of the coupling section 6.

[0067] Figure 42 shows a perspective view of a coupling plug 2. Thus, the coupling plug 2 comprises a plug body 14 which, in the exemplary embodiment, is manufactured in an integral manner via injection molding and is therefore also manufactured as a single piece. The plug body 14 comprises a joint section 15 for coupling to Figure 4 Additional pipes not shown. The joint segment 15 in this exemplary embodiment is configured so that additional pipes can be plugged onto the joint segment 15. In other exemplary embodiments, the joint segment can be configured so that additional pipes can be inserted therein and, for example, welded therein. For example, welding can be performed by means of laser welding or friction welding. According to the present invention, the plug body 14 includes a coupling surface 45, which is designed to be radially complementary to the seal 32 of the coupling sleeve 1. At the axially outward end of the plug body 14, the coupling surface 45 can be tapered in the axially outward direction so as to be easier to introduce into the coupling sleeve 1. The front wall at the axially outward end of the coupling plug 2 forms a coupling opening 19.

[0068] The intermediate section 30 is located between the joint section 15 and the coupling surface 45, which can be seen in particular from Figure 5 As can be seen. In this exemplary embodiment, the middle section 30 is defined by a flange 16, which can in particular serve as a stop for a further pipe not depicted here. In this exemplary embodiment, the two already mentioned securing portions 29 are arranged opposite one another on the flange 16 so as to be able to engage into a securing element 28 of the coupling sleeve 1 to prevent twisting. The securing portion 29 is advantageously followed in the axially outward direction by a conically tapered portion, which corresponds partly to the middle section 30 and partly to the valve section 24b. In the case of the connecting plug 2, the valve section 24b is preferably defined by an axial expansion, which is tensioned by the rigid elements 11b, 13b of the plug-in valve 10b.

[0069] In this exemplary embodiment, the plug valve 10b is configured identically to the sleeve valve 10a, so that the individual elements of the plug valve 10b are named identically to those of the sleeve valve 10a. The reference numeral abbreviation "b" always denotes the valve element of the coupling plug 2, while the reference numeral abbreviation "a" is reserved for the valve element of the coupling sleeve 1. The structure and function of the plug valve 10b are preferably identical to those of the sleeve valve 10a, so that the description of the sleeve valve 10a applies similarly to the plug valve 10b.

[0070] The axial section of the plug-in body 2 corresponding to the coupling surface 45 or the valve section 24b has a middle axis A, which defines the axial direction, the radial direction and the circumferential direction of the axial section. In this exemplary embodiment, the coupling plug 2 has a straight design, so that the longitudinal axis of the joint section 15 is identical to the middle axis A of the valve part 24b. In other exemplary embodiments, the joint section 15 or its longitudinal axis can be oriented at an angle to the middle axis A.

[0071] The coupling opening 19 or the valve section 24b is fluidically connected to the connection section 15 via the fluid channel 18. The inner diameter of the connection section 15 is preferably smaller than the inner diameter of the valve section 24. The inner diameter of the intermediate section 30 is preferably smaller than the inner diameter of the valve section 24b and preferably larger than the inner diameter of the connection section 15.

[0072] according to Figure 4 , the coupling plug 2 has at least one locking element 17, and preferably has two locking elements 17. One or more locking elements 17 are advantageously designed as grooves on the outside of the plug body 2, into which the locking elements 25 of the retainer 7 of the coupling sleeve 1 engage. Preferably, the conical section of the plug body 14 is designed to gradually expand the locking elements 25 of the retainer 7 when the coupling plug 2 is introduced, until the legs 25 are locked into the locking elements 17, thereby achieving the locking of the coupling plug 2 in the coupling sleeve 1.

[0073] Although Figure 6 The locking of the coupling plug 2 in the coupling sleeve 1 is shown, but in Figure 6 The locking element 25 is not visible in the selected perspective view. However, there, the base 26 of the retainer 7 indicates the axial position of the locking element 25. In this figure, it can be seen that the safety part 29 of the coupling plug 2 is located in the safety element 28 of the coupling sleeve 1. At the same time, the seal 32 bears against the coupling surface 45 in a force-fitting manner. Therefore, Figure 6 The locked state of the coupling assembly 1 , 2 including the coupling sleeve 1 and the coupling plug 2 is shown.

[0074] Figure 6 , it is emphasized that the pressure surfaces 23a and 23b abut against each other, whereby the valve bodies 12a and 12b are moved axially inwardly, respectively, and in this exemplary embodiment each abut against the valve holder 11a or 11b. In a similar manner, the respective valve guide 20a or 20b is further pushed in the respective axial inward direction, so that the valve guide 20a and 20b protrudes with its guide feet 37a and 37b in the respective axial inward direction relative to the respective valve holder 11a or 11b. As a result, the two reset elements 21a and 21b are equally compressed, so that approximately the same reset energy is stored in the two reset elements 21a and 21b.

[0075] Because the two valve bodies 12a and 12b collide with each other, both valve bodies 12a and 12b have been disengaged from the corresponding valve seats 13a or 13b, so that the fluid can flow in both directions. Therefore, the coupling assemblies 1, 2 are designed so that both valves 10a and 10b are fluidly opened while being mechanically locked by the retainer 7. Conversely, if the coupling assemblies 1, 2 are now released and the coupling plug 2 is pulled out of the coupling sleeve 1, both valves 10a and 10b are automatically closed, so that the coupling assemblies 1, 2 can be released with almost no fluid loss without emptying the fluid pipeline in advance.

[0076] During operation, and therefore in the connected state of the coupling assembly 1, 2, the fluid flows from the coupling plug 2 to the coupling sleeve 1, or vice versa, depending on the application. The fluid flows here through the windows 40a, 40b of the two valve retainers 11a, 11b and through the openings of the two valve seats 13a, 13b. The parts of the valve bodies 12a, 12b that expand or taper in the axial direction ensure that the fluid can flow through the valve bodies 12a, 12b with as little flow resistance as possible. For example, if the valve body has a roughly rectangular design in longitudinal section, the fluid encounters a vertical wall, which even in the open state of the valves 10a, 10b can cause significant eddies and thus flow resistance. In other exemplary embodiments not shown here, the contours of the valve bodies 12a, 12b can have a rounded design in longitudinal section, so that turbulence can be further reduced.

[0077] Even more components of the coupling assembly are advantageously configured to attenuate the flow resistance generated by the valves 10a, 10b themselves to a certain extent. It is very preferred that the axially inward front wall of the valve guide 20a, 20b tapers in the respective axially inward direction in the longitudinal section. The axially inward front wall of the valve guide 20a, 20b preferably has a rounded design in the longitudinal section. Very particularly preferably, in the open state of the respective valve 10a, 10b, the axially inward front wall of the valve guide 20a, 20b is flush with the respective valve holder 11a, 11b. Preferably, the middle section 30 of the coupling plug 2 has a tapered portion on the inner side facing the fluid channel 19. Preferably, the tapered portion has an axial expansion portion, which corresponds to at least one third of the axial length of the middle section 30, and preferably corresponds to at least half.

[0078] Reference numerals

[0079]

[0080]

[0081]

[0082]

Claims

1. A coupling sleeve (1) for fluid coupling with a coupling plug (2), wherein the coupling sleeve (1) comprises a sleeve body (3), wherein the sleeve body (3) comprises a connecting section (4) and a coupling section (6), wherein the connecting section (4) is used to be connected to a pipe (5) or to an assembly, and the coupling section (6) is used to couple with the coupling plug (2), wherein the coupling sleeve (1) is designed so that the coupling plug (2) can be inserted into the coupling sleeve (1), The coupling sleeve (1) has a locator (7) for locking the coupling plug (2) in the sleeve body (3), wherein the coupling section (6) and the connecting section (4) of the sleeve body (3) are fluidically connected to each other via an inner channel (8), wherein a portion of the inner channel (8) corresponding to the coupling section (6) defines a central axis (M) and an axial direction, a radial direction and a circumferential direction in a longitudinal section of the coupling sleeve (1), wherein the coupling section (6) terminates in an axially outward direction with a first coupling opening (9), A sleeve valve (10a) is arranged in the inner channel (8), wherein the sleeve valve (10a) comprises a valve holder (11a), an axially movable valve body (12a) and a valve seat (13a), wherein the valve seat (13a) is a component manufactured separately from the sleeve body (3), wherein the valve holder (11a) and the valve seat (13a) define a valve section (24a) of the sleeve body (3) or the coupling sleeve (1) in the axial direction, and wherein the sleeve valve (10a) has a valve guide. a guide member (20a), wherein the valve guide member (20a) defines a moving direction of the valve body (12a), wherein the valve body (12a) at least partially surrounds the valve guide member (20a) in sections in the axial direction and in the radial direction, wherein the coupling sleeve (1) is designed so that the valve body (12a) abuts against the valve seat (13a) in a fluid-tight manner in a locked state of the sleeve valve (10a), and does not abut against the valve seat (13a) in an open state of the sleeve valve (10a), It is characterized in that In the coupling sleeve (1), the axially inward front wall of the valve guide (20a) tapers inwardly, and in the open state of the sleeve valve (10a), the front wall is flush with the inward surface of the valve retainer (11a), The retainer (7) comprises at least one locking element (25), wherein the at least one locking element (25) is designed to be resiliently elastic, wherein the at least one locking element (25) is designed to engage with the coupling plug (2).

2. The coupling sleeve (1) according to claim 1, wherein: The coupling sleeve (1) is designed so that the valve holder (11a) and / or the valve body (12a) and / or the valve seat (13a) can be or are inserted into the sleeve body (3) in an axially inward direction.

3. The coupling sleeve (1) according to one of claims 1 or 2, wherein: The sleeve body (3) has a protrusion (43a) protruding radially inward, and the valve holder (11a) is connected to or fastened to the protrusion (43a).

4. The coupling sleeve (1) according to claim 1 or 2, wherein: The inner diameter of the connecting section (4) is smaller than the inner diameter of the valve section (24a).

5. The coupling sleeve (1) according to claim 1 or 2, wherein: The valve body (12a) has, in a longitudinal section, a section expanding in an axially outward direction and a section tapering in the axially outward direction.

6. The coupling sleeve (1) according to claim 1 or 2, wherein: The sleeve valve (10a) comprises a restoring element (21a), wherein the restoring element (21a) exerts a force on the valve body (12a) in the direction of the valve seat (13a).

7. The coupling sleeve (1) according to claim 1 or 2, wherein: The valve body (12a) has an axially outward front end portion, wherein the axially outward front end portion comprises a flat pressure surface (23a), wherein the flat pressure surface (23a) lies in a plane perpendicular to the central axis (M).

8. The coupling sleeve (1) according to claim 1 or 2, wherein: The axial position of the valve body (12a) in the locked state of the sleeve valve (10a) is located axially further outward than the axial position of the valve body (12a) in the open state of the sleeve valve (10a).

9. The coupling sleeve (1) according to claim 1 or 2, wherein: The axially inward front wall of the valve guide (20a) is circular.

10. A fluid line comprising a coupling sleeve (1) according to one of claims 1 to 9 and a pipe (5).

11. A coupling plug (2) for fluid coupling with a coupling sleeve (1) according to one of claims 1 to 9, wherein the coupling plug (2) comprises a plug body (14), wherein the plug body (14) comprises a joint section (15) and a coupling surface (45), wherein the joint section (15) is used to be connected to a pipe (5) or an aggregate, and the coupling surface (45) is used to couple with the coupling sleeve (1), wherein the coupling plug (2) is designed so that the coupling sleeve (1) can be plugged onto the coupling plug (2), wherein the coupling plug (2) has a locking element (17) for locking the coupling plug (2) in the coupling sleeve (1), wherein the joint section (15) and an axial section of the plug body (14) corresponding to the coupling surface (45) are fluidically connected to each other via a fluid channel (18), wherein the portion of the fluid channel (18) corresponding to the coupling surface (45) defines a central axis (A) and an axial direction and a radial direction as well as a circumferential direction in a longitudinal section of the coupling plug (2), wherein the coupling surface (45) terminates in an axially outward direction with a second coupling opening (19), A plug-in valve (10b) is arranged in the fluid passage (18), wherein the plug-in valve (10b) comprises a plug-in valve holder (11b), an axially movable plug-in valve body (12b) and an plug-in valve seat (13b), wherein the plug-in valve holder (11b) and the plug-in valve seat (13b) define a valve section (24b) of the plug body (14) or the coupling plug (2) in the axial direction, wherein the plug-in valve seat (13b) is a component manufactured separately from the plug body (14), and wherein the coupling plug (2) is designed such that the plug-in valve body (12b) abuts against the plug-in valve seat (13b) in a fluid-tight manner in a locked state of the plug-in valve (10b). ), and does not abut against the insert valve seat (13b) in the open state of the insert valve (10b), wherein the insert valve (10b) has an insert valve guide (20b), wherein the insert valve guide (20b) defines the movement direction of the insert valve body (12b), wherein the insert valve body (12b) at least partially surrounds the insert valve guide (20b) in sections in the axial direction and in the radial direction, wherein in the coupling plug (2), the axially inward front wall of the insert valve guide (20b) tapers inwardly, and wherein in the open state of the insert valve (10b), the front wall is flush with the inward surface of the insert valve retainer (11b).

12. The coupling plug (2) according to claim 11, wherein: The axially inward front wall of the male valve guide (20b) is circular.

13. A method for connecting a coupling sleeve (1) and a coupling plug (2) of a coupling assembly (1, 2), the coupling assembly (1, 2) comprising a coupling sleeve (1) and a coupling plug (2), wherein the coupling sleeve (1) is designed according to one of claims 1 to 9, wherein the coupling plug (2) is designed according to claim 11, wherein the coupling plug (2) is designed to be complementary to the coupling sleeve (1) and can be inserted into the coupling sleeve (1) in a fluid-tight manner, wherein the coupling assembly (1, 2) is designed so that the coupling plug (2) can be releasably fixed in the coupling sleeve (1), The coupling sleeve (1) has a sleeve valve (10a) and the coupling plug (2) has an insert valve (10b), wherein the coupling assembly (1, 2) is designed such that when the coupling plug (2) is inserted into the coupling sleeve (1), the sleeve valve (10a) and the insert valve (10b) are each transformed from a locked state to an open state.

14. The method according to claim 13, wherein: The coupling assembly (1, 2) is designed such that when the coupling plug (2) is inserted into the coupling sleeve (1), the plug-in valve (10b) hits the sleeve valve (10a), so that the plug-in valve (10b) and the sleeve valve (10a) are pressed axially inwardly against each other.

15. Use of a coupling sleeve (1) according to one of claims 1 to 9 and / or a coupling plug (2) according to claim 11 in an electric vehicle for fluidly cooling a battery of the electric vehicle.

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