Quick connector arrangement for pressure loss reduction

Abstract

The invention relates to a quick connector arrangement (10) for connecting fluid lines and for reducing pressure losses in fluid line systems, comprising a first and a second connecting body (2, 4), which can be connected to one other in a fluid-tight manner and, in the connected state, form and enclose a fluid channel (1) having a cross-section (9') which can be flowed through for conducting a fluid flow (F), wherein fluid lines can be connected to the connecting bodies (2, 4) in a fluid-tight manner and, in the connected state, form and enclose fluid channels having a cross-section (9) which can be flowed through for conducting a fluid flow (F). According to the invention, the quick connector arrangement (10) forms an angled quick connector which deflects a conducted fluid flow (F) at an angle, wherein the cross-section (9') which can be flowed of the fluid channel (1) of the connecting bodies (2, 4) is designed to be larger in diameter than the cross-section (9) which can be flowed of the connectable fluid lines.

Description

Quick-connect arrangement for pressure loss reduction

[0001] The invention relates to a quick-connect arrangement for connecting fluid lines and reducing pressure losses in fluid line systems according to the preamble of claim 1 and a fluid line system with at least one quick-connect arrangement according to claim 13.

[0002] To connect fluid lines carrying media, such as pipes or hoses, and to guide or divert fluids flowing through the lines, so-called quick connectors (QCs) are used.

[0003] The quick connectors comprise a connecting body that can be joined to a corresponding connecting body of the fluid line to form a quick connector assembly and enclose a flowable fluid channel. The quick connectors may, for example, have a curved deflection section that redirects the fluid flow at a specific angle, such as 45° or 90°.

[0004] In many industrial and energy system applications, such as thermal management systems in battery-electric vehicles, hydrogen transport systems, or heat pumps, where quick-connect fittings are used to join fluid lines, the total pressure drop of the fluid flow within the system is crucial for the efficiency and service life of the individual components. A fluid line system typically uses at least one, and usually several, quick-connect fittings to join fluid lines.

[0005] Especially in the deflection areas of quick-connect fittings or quick-connect fitting assemblies, strong turbulence zones and resistance can develop, and flow separation can occur due to sharp edges and right-angled deflections. It is known, for example, that flow-optimized designs can reduce pressure losses in the fluid flow and turbulence zones. However, optimizing the design with regard to fluid mechanics is often individually tailored, complex, and expensive to manufacture. Furthermore, in many cases, optimization is insufficient to achieve the desired reduction in the pressure profile.

[0006] In known quick-connect fitting arrangements and fluid piping systems, a nearly constant system diameter of the common fluid channel through which the connected individual elements flow is provided. Minor diameter differences or transitions are usually inherent to the design and occur at connection points between the quick-connect fitting and the pipe or fluid line. The fluid piping system consists of all the channel diameters or cross-sections through which the fluid flows through the connected individual elements (quick-connect fittings and connected fluid lines, etc.). Consequently, there are systems in which the quick-connect fittings (or parts of the quick-connect fittings, e.g., at the connection spigot or spigot) have a different diameter than the connected fluid lines or pipes of the system to facilitate manufacturing and assembly. For example, pipes with a nominal inner diameter of 16 mm are often connected to quick-connect fittings that have a diameter of only 15 mm in the connection or spigot area.The system diameter, or nominal diameter, is understood as a diameter that corresponds to an inner diameter forming the flowable cross-section for the fluid lines connected to the QCs. Pressure loss in the fluid line system can then be easily reduced by using a larger system diameter. Due to the uniform increase in the cross-section available for flow, or the flowable cross-section in the overall system, the fluid flow velocity decreases, which in turn results in an overall reduction in pressure loss. However, this method has several disadvantages. Increasing the size of the individual connecting elements or fittings inherently requires more material, and the overall external dimensions of the fluid line system become larger.This results in disadvantages such as higher system weight, more material usage, higher costs, more required installation space, etc.

[0007] The aim of the invention is to overcome these and other disadvantages of the prior art and to provide an improved quick-connect arrangement for connecting fluid lines and reducing pressure losses, which is cost-effective and simple in design.

[0008] The main features of the invention are specified in the characterizing part of claim 1. Embodiments are the subject of further claims 2 to 13.

[0009] In a quick-connect arrangement for connecting fluid lines and reducing pressure losses in fluid line systems, comprising a first and a second connecting body which can be connected fluid-tight and which, in the connected state, form and enclose a fluid channel with a flowable cross-section for conveying a fluid flow, wherein fluid lines can be connected fluid-tight to the connecting bodies and, in the connected state, form and enclose fluid channels with a flowable cross-section for conveying the fluid flow, it is provided according to the invention that the quick-connect arrangement forms an angled quick-connector which deflects a conveyed fluid flow at an angle, wherein the flowable cross-section of the fluid channel of the connecting bodies is larger in diameter than the flowable cross-section of the connectable fluid lines.

[0010] According to the invention, the cross-sectional area through which fluid flows through the connecting bodies is always larger than the cross-sectional areas through which fluid flows through the connected fluid lines. This means that the flow cross-section of the connecting bodies is larger, particularly in the area of ​​the bends, than is typical for flow control devices (QCs) in the prior art. Typically, known QCs have a diameter that is 87.5 to 100% larger than the nominal diameter of the connected fluid lines. Therefore, it is particularly important that the cross-sectional area through which fluid flows through the connecting bodies is larger in diameter than is typical for such bends in the prior art.

[0011] As described at the outset, significant pressure losses in the fluid flow occur, particularly in the area of ​​quick connectors or quick connector assemblies within fluid systems. Due to the larger diameter and the resulting larger flow-through cross-section in the connecting body area, pressure losses in the system are effectively reduced locally via the quick connector assembly, especially in bending areas. This is because the fluid flow velocity is significantly reduced by the increased effective flow-through cross-section of the quick connector assembly. The aforementioned negative effects, which would occur with an overall larger, constant system diameter, can thus be advantageously limited or even avoided.

[0012] Particularly with redirecting quick connectors or diverting connectors, for example with a 45° or 90° deflection of the fluid flow, or valves or the like, significant improvements in pressure loss reduction can be achieved because large pressure losses are to be expected precisely in the deflection and / or insertion areas of the quick connector assemblies. The invention ensures that the connecting bodies of quick connectors with deflection sections in fluid piping systems have a larger flow cross-section or diameter compared to the other pipes in the system. This advantageously allows increased turbulence and pressure losses to be effectively reduced, especially in the area of ​​the deflection sections.

[0013] The nominal diameter or system diameter of the quick-connect fitting assembly or the fluid lines of the fluid piping system (also nominal size, formerly NW or now abbreviated DN from the French "diamètre nominal" for nominal diameter; or diameter according to standard) is, particularly in building services engineering, a numerical designation of the approximate diameters of the components in a piping system, used for reference purposes. The nominal diameter is specified with a rounded number, which is intended to allow the diameters of the pipes and connection dimensions of pipe fittings and valves within a specific (standardized) piping system to be correlated.

[0014] The specified, rounded number is referred to as dimensionless and is based on the approximate inner diameter of, for example, a pipe or line, a hose, a fitting, molded part or the connection dimension of a matching valve (valve, gate valve) in millimeters.

[0015] The diameter transition can be understood as an increase in diameter or as a widening of the nominal diameter provided as standard in the fluid piping system, or as a widening of the fluid channel available for the flow or the cross-section through which the flow can pass, and causes a reduction in the flow velocity and a local reduction in the pressure losses that would occur in comparison with a constant nominal diameter without a diameter transition.

[0016] By its very nature, a local increase in diameter to reduce pressure loss can, conversely, require sudden diameter transitions from a larger inner diameter of the quick-connect fitting assembly to a smaller nominal inner diameter of the quick-connect fitting assembly or the connected fluid line. Depending on the intensity of the increase, this could even cause pressure losses. This can inhibit the desired effect of pressure loss reduction.

[0017] However, fluid mechanics investigations and simulations regarding the total pressure loss as a function of a diameter ratio or an increase in the nominal diameter show that in a certain percentage range of diameter increases, the positive desired effect of pressure loss reduction outweighs the additional pressure losses due to the diameter transitions.

[0018] The diameter ratio can be considered as the quotient of the larger diameter and the nominal diameter. In the field of electromobility and many other applications, Reynolds numbers (Re) between 5000 and 40000 are expected. The investigations were carried out for both high and, in particular, low Reynolds numbers such as 5000 or 10000. For high Reynolds numbers, the diameter ratio can be estimated, for example, using one-dimensional fluid dynamics. With a small additional effort, this method can also be implemented for lower Reynolds numbers.

[0019] In the various embodiments of the invention described below, the percentage values ​​regarding the diameter increase refer to the original size of the nominal diameter or system diameter. In this sense, a 10% increase through a diameter transition means, for example, in the case of a quick connector with a nominal diameter of 10 mm, an increase in diameter of 1 mm; that is, the nominal diameter or flowable cross-section would be increased from 10 mm to 11 mm by the diameter transition.

[0020] In a preferred embodiment, the diameter of the flowable cross-section of the connecting body can be at least 1% larger than the diameter of the flowable cross-section of the fluid lines to be connected. This advantageously ensures that at least a pressure loss reduction of approximately 3% (even at low Re values, for example, Re = 10000) can be guaranteed. This allows for a minimum level of pressure loss reduction. A one percent increase in diameter for a quick connector or a fluid line with a nominal diameter or flowable cross-sectional diameter of, for example, 16 mm, corresponds to an increase of 0.16 mm. This is a marginal increase that is hardly perceptible without measuring instruments. Nevertheless, significant pressure loss reductions of 3% could be achieved with minimal effort.

[0021] According to a further preferred embodiment, the diameter of the flowable cross-section of the connecting bodies can be a maximum of 25% larger than the diameter of the flowable cross-section of the fluid lines being connected. At low diameter ratios, the reduction in pressure loss due to the lower flow velocity is much greater than the additional losses due to the diameter transitions. As the diameter ratio increases, the influence of the diameter transition grows until, at some point, the combined total pressure loss increases again and no further reduction is achieved. Investigations have shown that this optimum is reached at approximately a 25% increase in diameter with respect to the nominal diameter or the flowable cross-section of the fluid lines being connected.For enlargements greater than 25%, the pressure loss increases again, so this measure advantageously creates a buffer zone for efficient reduction. For example, and preferably, the diameter transitions, or the at least one diameter transition, could increase the nominal diameter by 1 to 25%. This enlargement range ensures, in particular, that the desired positive effect of pressure loss reduction always outweighs the additional pressure losses due to the diameter transitions. It is also conceivable to increase the nominal diameter by 0.1 to 25% through the diameter transition to also cover enlargement values ​​below 1%. Depending on the application, even these small changes can be specifically relevant and have a correspondingly large impact.This simultaneously increases the compatibility and usability of the invention. The magnification range of 1 to 25% or 0 to 25% thus constitutes an effective "effect" range.

[0022] Preferably, the diameter of the flowable cross-section of the connecting body can be approximately 25% larger than the diameter of the flowable cross-section of the fluid lines to be connected. It has been shown that an optimal pressure loss reduction is achieved with an approximately 25% increase in diameter. Thus, this measure allows for the maximum possible pressure loss reduction through the diameter transition. This increases the efficiency of pressure loss reduction. With a diameter increase of approximately 25% of the nominal diameter, a maximum pressure loss reduction of up to 28% can be achieved.

[0023] According to a further preferred alternative embodiment, the diameter of the flowable cross-section of the connecting bodies can be a maximum of 10% larger than the diameter of the flowable cross-section of the connecting fluid lines. Fluid-mechanical analyses regarding the total pressure loss as a function of a diameter ratio or an increase in the nominal diameter show non-linear behavior. The invention advantageously utilizes the non-linear behavior of the correlation between pressure loss and diameter ratio, because this allows even much smaller increases to lead to a significant reduction in pressure loss. For example, and preferably, the transitions or the at least one diameter transition could result in an increase in the nominal diameter of 0.1 to 10%.This enlargement range ensures, in particular, that relatively high pressure loss reductions can be achieved with minimal additional manufacturing and material costs. Increasing the inner diameter of this dimension could advantageously be accomplished with only minor or even no changes to the external dimensions of the quick-connect fittings, especially the outer dimensions, thus effectively avoiding all the previously mentioned disadvantages of diameter enlargements. At the same time, this ensures that the desired positive effect of pressure loss reduction always outweighs the additional pressure losses due to the diameter transitions, because the range of 0.1 to 10% lies within the "effective" range of 0 to 25%.

[0024] According to a further preferred embodiment, the diameter of the flowable cross-section of the connecting body can be approximately 3% larger than the diameter of the flowable cross-section of the fluid lines to be connected. An increase of 3% represents a minor change and, even at low Reynolds numbers, such as Re = 5000 or 10000, results in a pressure loss reduction of approximately 8%. This has proven to be an ideal compromise between a relatively high pressure loss reduction and minimal additional effort. The 3% increase can be implemented without complicating the manufacturing process. No additional weight is added because no additional material is required. Advantageously, all external dimensions can remain identical compared to a prior art quick connector with a constant nominal diameter.This makes the quick connector according to the invention particularly simple in design and cost-effective. For example, and preferably, the transitions or the at least one diameter transition could increase the nominal diameter by 1 to 3%. This enlargement range ensures, in particular, that relatively high pressure loss reductions can be achieved with little (or no) additional manufacturing and material input. The external dimensions of the quick connector assembly remain unchanged and unaffected by the diameter transitions with 3% enlargement. At the same time, it is ensured that the desired positive effect of pressure loss reduction always outweighs the additional pressure losses due to the diameter transitions, because the 1 to 3% range lies within the "effectiveness" range of 0 to 25%.

[0025] According to a further preferred embodiment, at least one diameter transition can be formed directly on the first connecting body or at a connection point between the first connecting body and a fluid line that is fluid-tightly connected to the first connecting body, in order to increase the flowable cross-section of the connectable fluid lines. This simplifies the implementation even further, because in particular the manufacturing of the transitions or the diameter transition is simplified. The fluid line to be connected or the second connecting body can remain unchanged. In addition to forming a transition directly on the connecting body, the diameter transition can preferably also be formed at the connection or connection point between the body and the pipe or the connectable fluid line.According to this design, no transition step is formed directly on the body; instead, the step is advantageously formed "by itself" in the area of ​​the connection point between the body and the connected pipe or fluid line. This effectively reduces manufacturing costs because the transition can be created particularly easily without additional complex manufacturing processes.

[0026] Preferably, the first connecting body can have a first diameter transition to increase the flowable cross-section of the connectable fluid lines, and the second connecting body can have a second diameter transition to increase the flowable cross-section of the connectable fluid lines. Both diameter transitions can preferably have identical increases in the flowable cross-section of the connectable fluid lines.

[0027] It is further preferably conceivable that the first and second diameter transitions can be identical, with the first and second diameter transitions resulting in identically large diameter increases. This measure further simplifies manufacturing and reduces production costs.

[0028] According to a further preferred embodiment, the at least one diameter transition can be continuously smoothed, wherein the at least one diameter transition can be formed by a chamfer with respect to a flow direction of the fluid flow. The smoothing further improves the efficiency of the pressure loss reduction. For example, by increasing the diameter by 3% using the at least one smoothed diameter transition, a pressure loss reduction of up to 12% can be achieved without increasing the manufacturing complexity, changing the external dimensions, or consuming additional weight or material.

[0029] According to a further preferred embodiment, the first connecting body can have a first housing, wherein the first housing can encompass the flowable cross-section of the connecting bodies with the larger diameter over its entire extent. The diameter transitions or the transition itself can be positioned accordingly. This ensures that the fluid flow passes through a sufficiently large diameter flow path so that the local pressure loss reduction via the quick-connect arrangement can have an overall positive effect on the fluid piping system.

[0030] According to a further preferred embodiment, the first connecting body can be a 90° quick connector, wherein the first connecting body can have a connection nozzle for connecting a fluid line and a receiving area for receiving the second connecting body.

[0031] It is further preferably conceivable that the first connecting body can be designed as an angled quick-connect fitting. Preferably, the first connecting body can be, for example, a 45° quick-connect fitting. All other angles, such as 60° in particular, are also conceivable. The first connecting body, designed as a quick-connect fitting, can generally be configured as a deflecting quick-connect fitting that deflects the fluid flow at a specific or variable angle, thus making the quick-connect fitting arrangement according to the invention an angled quick-connect fitting.

[0032] According to a further preferred embodiment, the second connecting body can be an end of a fluid line and have a second housing, wherein the second housing can comprise an insertion section and a projection. Advantageously, the insertion section can be inserted into the first connecting body for connection. Conversely, the first connecting body can also be fitted onto the insertion section. The diameters and dimensions of the facing sections can be appropriately dimensioned and matched.

[0033] According to a further preferred embodiment, the insertion section of the second connecting body can be designed to be complementary to the receiving area of ​​the first connecting body, wherein the connecting bodies can be connected to each other by means of a positive and / or force-fit connection by inserting the insertion section into the receiving area. This allows the connecting bodies to be securely and fluid-tightly fixed to one another in order to allow the fluid flow to pass through.

[0034] Preferably, the first connecting body can have end-face openings for guiding the fluid flow, wherein the at least one diameter transition can be formed at one of the end-face openings. This is advantageous from a manufacturing point of view because the opening area can ideally be used to form the diameter transition without penetrating the interior of the fluid channel of the quick connector.

[0035] Preferably, the first diameter transition can be formed at the end face opening of the first connecting body, and the second diameter transition can be formed in the area of ​​the protrusion on the second connecting body. Furthermore, preferably, an end face opening of the first connecting body can circumferentially enclose the radial protrusion of the second connecting body. The second connecting body can be arranged with its insertion section in the receiving area of ​​the first connecting body and aligned radially with the end face opening at the receiving area. This ensures that the diameter transition formed inside the fluid channel also aligns substantially radially with the protrusion and the end face opening, and can therefore be dimensioned larger without requiring any changes to the external dimensions.

[0036] According to another aspect, the invention relates to a fluid piping system with at least one described quick-connect arrangement.

[0037] Further features, details and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. The drawings show:

[0038] a schematic sectional view of the quick connector arrangement according to the invention.

[0039] The quick connector arrangement, generally designated in 10, is used to connect fluid lines and to reduce pressure losses in fluid piping systems.

[0040] The quick-connect arrangement 10 comprises a first connecting body 2 and a second connecting body 4, which can be connected to each other and, in the connected state, form and enclose a fluid channel 1 for guiding a fluid flow F. The flow direction of the fluid flow F can, in principle, also be reversed, so that the quick-connect arrangement 10 supports bidirectional guidance of the fluid flow F.

[0041] The quick-connect arrangement 10 has a nominal diameter 9, which specifies an inner diameter and defines a cross-sectional area for the fluid flow F. At least one of the two connecting bodies 2, 4 of the quick-connect arrangement 10 has at least one diameter transition 8, 8', wherein the at least one diameter transition 8, 8' increases the nominal diameter 9 to a larger diameter 9'.

[0042] As can be seen from the representation of a connected state of the connecting bodies 2, 4, a first diameter transition 8 can be formed on the first connecting body 2 of the quick connector arrangement 10, and a second diameter transition 8' can be formed on the second connecting body 4.

[0043] The diameter transitions 8, 8' shown can be identical and increase the nominal diameter 9, for example, and preferably by about 3%.

[0044] Furthermore, the diameter transitions 8, 8' can increase the nominal diameter 9 by at least 1%.

[0045] Furthermore, the diameter transitions 8, 8' can increase the nominal diameter 9 by a maximum of 25%. Ideally, the diameter transitions 8, 8' can increase the nominal diameter 9 by approximately 25%.

[0046] Alternatively, it is conceivable that the diameter transitions 8, 8' can increase the nominal diameter 9 by a maximum of 10%.

[0047] Preferably, all other areas and percentage magnification specifications mentioned in the description regarding the diameter transitions and the resulting magnifications of the nominal diameters can also be implemented using the diameter transitions 8, 8'.

[0048] The diameter transitions 8, 8' can be continuous and smooth, and can be formed by a slope with respect to the flow direction of the fluid flow F. These transitions can be designed as chamfered or rounded edges.

[0049] The first connecting body 2 can have a first housing 2', wherein the first housing 2' can encompass the larger diameter 9' over its entire extent. As can be seen, the first connecting body 2 can be a 90° quick connector (or more generally, an angled quick connector), wherein the first connecting body 2 can have a connection nozzle 3 for connecting a fluid line and a receiving area 6 for receiving the second connecting body 4.

[0050] The second connecting body 4 can be an end of a fluid line and may have a second housing 4', the second housing 4' comprising an insertion section 6' and a protrusion 5.

[0051] The insertion section 6' of the second connecting body 4 can be designed to be complementary to the receiving area 6 of the first connecting body 2, wherein the connecting bodies 2, 4 can be connected to each other by inserting the insertion section 6' into the receiving area 6 in a form-fit and / or force-fit manner.

[0052] As can be seen, the first connecting body 2 can have end-face openings 12, 12' for guiding the fluid flow F, wherein the first diameter transition 8 can be formed at the end-face opening 12 of the first connecting body 2, and wherein the second diameter transition 8' can be formed in the region of the end-face opening 12' and at the protrusion 5 of the second connecting body 4.

[0053] The invention is not limited to the embodiments described above, but can be modified in a variety of ways. In particular, the precise coordination of the material combination, the precise dimensioning of the individual elements, or the number of diameter transitions used in the quick connectors, or the number of quick connectors used in fluid piping systems, can vary in such a way that the required enlargement to achieve the desired pressure loss reduction can be ensured with a correspondingly manageable application.

[0054] The proposed solution can advantageously be combined with other pressure loss optimizations in the field of quick connectors and fluid piping systems to achieve even better overall efficiency. The invention offers a solution that does not require more complex tools or increased material usage and can largely be implemented at no additional cost. Since pressure loss, and in particular its impact on component safety and service life, is a key issue, the invention represents a significant improvement in pressure loss-optimized fluid handling systems.

[0055] All features and advantages arising from the claims, the description and the drawing, including design details, spatial arrangements and process steps, can be essential to the invention both individually and in various combinations. Reference symbol list

[0056] F Fluid flow

[0057] 1 fluid channel

[0058] 2 first connecting body (90° quick connector)

[0059] 2' first housing (first connecting body)

[0060] 3 connection spigots (Christmas tree cones)

[0061] 4 second connecting body (fluid line)

[0062] 4' second housing (second connecting body)

[0063] 5 Survey

[0064] 6 Receiving area (first connecting body)

[0065] 6' Insert section (second connecting body)

[0066] 7 Deflection section (first connecting body)

[0067] 8 First diameter transition

[0068] 8' Second diameter transition

[0069] 9 cross-sectional area through which fluid flows can pass (fluid channel connected fluid lines)

[0070] 9' flowable cross-section (fluid channel connecting body)

[0071] 10 quick connector arrangement

[0072] 12 Front opening (connection spigot)

[0073] 12' front opening (receiving area)

Claims

Quick-connect arrangement (10) for connecting fluid lines and reducing pressure losses in fluid line systems, comprising a first and a second connecting body (2, 4) which can be connected fluid-tight and which, in the connected state, form and enclose a fluid channel (1) with a flowable cross-section (9') for conveying a fluid flow (F), wherein fluid lines can be connected fluid-tight to the connecting bodies (2, 4) and, in the connected state, form and enclose fluid channels with a flowable cross-section (9) for conveying the fluid flow (F), characterized in that the quick-connect arrangement (10) forms an angled quick-connector which deflects a conveyed fluid flow (F) at an angle, wherein the flowable cross-section (9') of the fluid channel (1) of the connecting bodies (2, 4) is larger in diameter than the flowable cross-section (9) of the connectable fluid lines. Quick connector arrangement according to claim 1, characterized in that the diameter of the flowable cross-section (9') of the connecting bodies (2, 4) is at least 1% larger than the diameter of the flowable cross-section (9) of the connectable fluid lines. Quick connector arrangement according to claim 1 or 2, characterized in that the diameter of the flowable cross-section (9') of the connecting bodies (2, 4) is a maximum of 25% larger than the diameter of the flowable cross-section (9) of the connectable fluid lines. Quick connector arrangement according to claim 1 or 2, characterized in that the diameter of the flowable cross-section (9') of the connecting bodies (2, 4) is a maximum of 10% larger than the diameter of the flowable cross-section (9) of the connectable fluid lines. Quick connector arrangement according to one of the preceding claims, characterized in that the diameter of the flowable cross-section (9') of the connecting bodies (2, 4) is approximately 3% larger than the diameter of the flowable cross-section (9) of the connectable fluid lines. Quick connector arrangement according to one of the preceding claims, characterized in that at least one diameter transition (8, 8') for increasing the flowable cross-section (9) of the connectable fluid lines is formed directly on the first connecting body (2) or at a connection point between the first connecting body (2) and a fluid line connected fluid-tight to the first connecting body (2). Quick connector arrangement according to one of the preceding claims, characterized in that the first connecting body (2) has a first diameter transition (8) to increase the flowable cross-section (9) of the connectable fluid lines, wherein the second connecting body (4) has a second diameter transition (8') to increase the flowable cross-section (9) of the connectable fluid lines. Quick connector arrangement according to claim 6 or 7, characterized in that the at least one diameter transition (8, 8') is continuously smoothed, wherein the at least one diameter transition (8, 8') is formed by a slope in relation to a flow direction of the fluid flow (F). Quick connector arrangement according to one of the preceding claims, characterized in that the first connecting body (2) has a first housing (2'), wherein the first housing (2') encompasses the flowable cross-section (9') of the connecting bodies (2, 4) with a larger diameter over its entire extent. Quick connector arrangement according to one of the preceding claims, characterized in that the first connecting body (2) is a 90° quick connector, wherein the first connecting body (2) has a connection nozzle (3) for connecting a fluid line and a receiving area (6) for receiving the second connecting body (4). Quick connector arrangement according to one of the preceding claims, characterized in that the second connecting body (4) is an end of a fluid line and has a second housing (4') wherein the second housing (4') comprises an insertion section (6') and a protrusion (5). Quick connector arrangement according to claims 10 and 11, characterized in that the insertion section (6') of the second connecting body (4) is designed to be complementary to the receiving area (6) of the first connecting body (2), wherein the connecting bodies (2, 4) can be connected to each other by inserting the insertion section (6') into the receiving area (6) in a form-fit and / or force-fit manner. Fluid piping system with at least one quick connector arrangement (10) according to one of the preceding claims.

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