Method for sealed connection of a connector to a coaxial tubular heat exchanger

Abstract

The invention relates to the sealed connection of a connector with a coaxial tubular heat exchanger, and also to a method for the sealed connection of a connector (12) with a coaxial tubular heat exchanger (14), in particular for an air conditioning circuit of a motor vehicle, characterized in that the method comprises the following successive steps: a) the free end (14b1) of the outer tube of the exchanger is mounted in or on the connector (12), b) the outer tube (14b) is directly fixed to the connector, c) the inner tube (14a) is inserted into the outer tube (14b) until the free end (14a1) of the inner tube is mounted in or on the connector (12), the mounting ensuring the sealing between the inner tube and the connector, and d) the inner tube (14a) and the outer tube (14b) are directly fixed against one another to avoid relative displacement.

Description

Technical Field

[0001] The present invention relates in particular to a method for sealing a connector to a coaxial tubular heat exchanger, and a fluid connection device, particularly for a fluid connection device for an air conditioning circuit in a vehicle. Background Technology

[0002] In certain air conditioning circuits used in motor vehicles, particularly those using carbon dioxide or R134a as the refrigerant, it is necessary to achieve heat exchange or heat transfer between the fluid seeking cooling in the high-pressure section of the circuit and the same fluid from the low-pressure section of the circuit, which serves as a cold source and is heated during the exchange, in order to improve circuit efficiency. For this purpose, since there is no exchange with the outside air of the vehicle or with the air inside the passenger compartment, a so-called "internal" heat exchanger is used.

[0003] Typically, the heat exchanger is made of metal and is connected to a corresponding pipe in an air conditioning circuit, particularly including hoses, via connectors installed at each end of the exchanger. The heat exchanger can be, for example, a plate type, consisting of stacked flat tubes that exchange heat through convection with the outside air and through conduction. Alternatively, the heat exchanger can be multi-tube type, the simplest version of which is a counter-current coaxial tubular type, thus achieving heat exchange without the aforementioned convection.

[0004] In the latter case, the coaxial exchanger typically defines at least one radial inner channel and at least one radial outer channel. The radial inner channel is defined by a sleeve and is used to convey fluid from the high-pressure portion of the circuit, while the radial outer channel is located between the exchanger housing and the sleeve and is used to convey fluid from the low-pressure portion of the circuit. The sleeve and housing are formed from a single component and are connected together by longitudinal fins distributed around the circumference of the exchanger.

[0005] It is known to use two concave connectors for the relevant ends of such a coaxial exchanger, which is axially welded or brazed. These two concave connectors are separated on a sleeve by three weld or brazed wires, so that these connectors respectively define conduits for fluid communication with the inner and outer channels in a sealed manner. For example, a description of these connectors can be found in document WO-A1-2007 / 1013439.

[0006] The main disadvantage of these coaxial internal switches equipped with concave connectors is that the resulting weld lines or brazing lines are close to each other, especially for continuous brazing, which creates the risk of reflow of previous brazing and must be done blindly. This may result in unsealed joints and / or the risk of brazing seepage into the corresponding inner or outer channels, which can lead to load loss and even blockage of these channels by contaminants.

[0007] It is also known to use a single connector at the connection end of a coaxial switch, for example as described in document EP-A1-1762806, wherein the connector is assembled to the housing and inner sleeve by brazing via an intermediate connector, and in document EP-A1-1128120 (Figure 10, etc.), wherein the connector is directly brazed to the housing and sleeve of the switch by two brazing seams.

[0008] The main drawback of the coaxial internal exchangers proposed in the latter two documents is that assembling the coaxial internal exchanger to the connector requires at least two simultaneous brazing operations, and at least one of these brazing operations must be performed "blindly" or under difficult conditions, relative to the engagement between the connector and the inner sleeve, due to its location inside the connector. This leads to a significant risk of connector non-compliance and thus loss of the transmitted fluid. Furthermore, this brazing involves production costs and a relatively high scrap rate for the resulting connection.

[0009] The applicant proposed a solution in document EP-A1-2 199 721. This solution involves assembling the connector to the housing by welding and assembling the connector to the sleeve by at least one annular sealing bushing mounted on the axial extension of the sleeve relative to the housing. The axial distance between the bushing and the weld line is sufficiently important that the bushing is not altered by the welding. The exchanger is formed from a single component, and the sleeve and housing are inseparable and therefore simultaneously mounted within the connector.

[0010] Although the solution is effective, it is not entirely satisfactory due to the large volume of the exchanger and connector caused by the axial extension of the sleeve.

[0011] The purpose of this invention is to propose an alternative to this solution. Summary of the Invention

[0012] This invention proposes a method for sealing the connection between a connector and a coaxial tubular heat exchanger, particularly for use in the air conditioning circuit of motor vehicles.

[0013] The exchanger includes two coaxial tubes, an inner tube and an outer tube. The outer tube defines a first annular channel around the inner tube for the flow of a first fluid, and the inner tube defines a second inner channel for the flow of a second fluid. The tubes are independent of each other, and one of the tubes includes a protrusion adjacent to the other tube to maintain a distance between them.

[0014] The connector includes two fluid passage chambers, each connected to a channel of the exchanger.

[0015] The method is characterized by comprising the following sequential steps:

[0016] a) The free end of the outer tube is installed in or on the connector.

[0017] b) The outer tube is directly fixed to the connector.

[0018] c) The inner tube is inserted into the outer tube until the free end of the inner tube is installed in or on the connector. This installation ensures a seal between the inner tube and the connector.

[0019] d) The inner and outer tubes are directly fixed together to avoid relative displacement.

[0020] Contrary to the disclosure in document EP-A1-2199721, the inner and outer tubes of the switch are independent. Therefore, the inner and outer tubes are sequentially installed in or on the connector. Specifically, the outer tube is installed in step a), and secured to the connector in step b). If the outer tube and connector are metallic, this securing can be achieved by welding or brazing. In variations, where the outer tube and connector are made of other materials, this securing can be ensured by gluing, electron beam welding, etc. During this securing step b), the inner tube has not yet been inserted into the outer tube, and therefore there is no risk of alteration due to the securing operation and, for example, due to heating caused by welding. Then, in step c), the inner tube is inserted into the outer tube until it is sealed to the connector. This is typically a blind installation. Strictly speaking, the inner tube is not directly secured to the connector. The inner tube and connector are simply engaged in or on top of each other. The inner tube is indirectly secured relative to the connector via the outer tube. The tubes are fixed in step d), which prevents any relative movement between the tubes during operation.

[0021] The method according to the invention may include one or more of the following steps or features, which may be employed individually or in combination with each other:

[0022] - Step d) is carried out by plastic deformation of at least one of the tubes, and in particular by pressing the outer tube onto the inner tube, or by bending the inner and outer tubes simultaneously.

[0023] - The method includes, between steps b) and c), the step of installing at least one annular seal around the free end of the inner tube;

[0024] - In steps a) and c), the tubes are engaged in the two housings of the connector by a convex-concave interlock;

[0025] - In steps a) and c), the tube is guided at the inlet of the housing by engaging the free end of the tube with the chamfer of the connector;

[0026] - Prior to step c), the free end of the inner tube is plastically deformed or includes a plastically deformed component to form at least one annular groove at the outer periphery of the free end or component, and preferably two annular grooves are formed adjacent to the outer periphery of the free end or component.

[0027] - Prior to step c), the free end of the inner tube is plastically deformed or a component including plastic deformation is plastically deformed to change the outer diameter of the free end or component at at least one end;

[0028] - The inner and outer tubes are made of metal.

[0029] - The inner and outer tubes are made of different materials;

[0030] - The inner tube is metal, and the outer tube is made of plastic or composite material;

[0031] - Secure the outer tube to the connector by welding, brazing, or gluing;

[0032] - The connector is made of metal.

[0033] The present invention also relates to a fluid connection device comprising a connector and a coaxial tubular heat exchanger, particularly for air conditioning circuits in motor vehicles.

[0034] The connector forms two cavities for fluid to pass through, each of which communicates with a channel in the exchanger.

[0035] The exchanger includes two coaxial tubes, an inner tube and an outer tube. The outer tube defines a first annular channel around the inner tube for the flow of a first fluid, and the inner tube defines a second inner channel for the flow of a second fluid. The tubes are independent, and one of the tubes includes a protrusion adjacent to the other tube to maintain a distance between them.

[0036] The fluid connection device is characterized by being obtained by the method described above, and:

[0037] The outer tube includes a free end that engages in or on the connector, and the outer tube is directly secured to the connector.

[0038] The inner tube includes a free end that is mounted in or on the connector, and this mounting ensures a seal between the inner tube and the connector.

[0039] The inner and outer tubes are directly fixed together to avoid relative displacement.

[0040] Advantageously, the inner and outer tubes are fixed by pressing the outer tube onto the inner tube, bending the inner and outer tubes simultaneously, or welding the ends of the inner and outer tubes opposite to the connector. Attached Figure Description

[0041] Other features and advantages of the invention will become apparent as you read the following detailed description, which will be understood with reference to the accompanying drawings, in which:

[0042] Figure 1 This is a schematic perspective view of a fluid connection device according to the invention, which specifically includes a heat exchanger and a connector, in a first position prior to the forming operation.

[0043] Figure 2 yes Figure 1 A schematic perspective view of the device in a second position after the forming operation.

[0044] Figure 3 This is a schematic perspective view of a coaxial tubular heat exchanger.

[0045] Figure 4 yes Figure 1 and Figure 2 An enlarged schematic view of the device details, showing a portion of the connector and switch in axial cross-section.

[0046] Figure 5 yes Figures 1 to 3 A schematic axial cross-sectional view of the connector of the device.

[0047] Figure 6 yes Figures 1 to 3 A schematic axial cross-sectional view of the free end of the inner tube of the exchanger of the device.

[0048] Figure 7 This is a flowchart illustrating the steps of a method according to the invention for sealing the connection between a connector and a switch, and...

[0049] Figure 8 This is a schematic partial perspective view of an embodiment variation of the device according to the present invention. Detailed Implementation

[0050] Figures 1 to 6An embodiment of the fluid connection device 10 according to the invention for an air conditioning circuit in a vehicle, particularly a motor vehicle, is shown.

[0051] exist Figure 1 and Figure 2 The device 10, which is visible as a whole, includes a connector 12 (concave in this case) and a coaxial tubular heat exchanger 14 in the example shown.

[0052] The exchanger 14 has a generally elongated shape and includes two coaxial tubes extending inside each other. The inner tube is designated 14a and the outer tube is designated 14b.

[0053] The outer tube 14b defines an annular channel C1 for the flow of a first fluid around the inner tube 14a, and the inner tube 14a defines a second inner channel C2 for the flow of a second fluid. Figure 3 To ensure sufficient space between the tubes and to form channel C1, one tube typically includes a protrusion (e.g., a fin) adjacent to another tube in the same tube, thus maintaining a distance between the tubes. The fins may extend parallel to or spirally around the longitudinal axis X of the exchanger 14. The fins may be continuous or discontinuous.

[0054] Therefore, it should be understood that the outer tube 14b may include inner fins 15 on the cylindrical inner surface surrounding the inner tube 14a, the inner fins being supported on the cylindrical outer surface of the inner tube 14a. Figure 3 In a variant, the inner tube 14a may include outer fins on the cylindrical outer surface surrounded by the outer tube 14b, the outer fins being supported on the cylindrical inner surface of the outer tube 14b.

[0055] Tubes 14a and 14b may be made of the same or different materials. These tubes may be made of, for example, metal alloys or plastic materials.

[0056] Connector 12 is located at the longitudinal end of switch 14, the opposite longitudinal end of which is connected to another type of connector 16, which is not part of the present invention.

[0057] exist Figure 1 In this configuration, the switch 14 has a straight shape. Figure 2 In the middle, the switch 14 has a shape that presents several bends. From Figure 1 Starting with the initial shape, Figure 2 The exchanger 14 has undergone forming, shaping, or bending steps. As described below, such forming can hold the tubes 14a, 14b together, especially in areas where the tubes are simultaneously bent and plastically deformed by clamping them against each other. Figure 2 The device 10 is ready to be installed in the air conditioning circuit and used.

[0058] Figure 4 This is an enlarged view of connector 12 and the end of the connector that connects to exchanger 14. Figure 5 The connector 12 itself is shown in the image.

[0059] like Figure 4 As shown, the outer tube 14b has a straight, unconnected end (in a plane perpendicular to the longitudinal axis X of the exchanger 14), which forms a free end 14b1 that engages in the housing 18 of the connector 12.

[0060] The inner tube 14a has a free end 14a1, which is preferably formed from a single component along with the rest of the tube. However, in a variant, the free end can be formed by guiding and securing a tubular member 20 to the end 14a2 of the tube 14a.

[0061] exist Figure 6 The figure shows the free end 14a1 or the component 20 itself. The end 14a or component 20 has undergone a forming or shaping operation. Prior to this operation, the end or component includes a cylindrical inner surface and a cylindrical outer surface and has a constant inner and outer diameter. After this operation, as shown, the end or component has a flared portion 20a for connection to the remainder of the inner tube 14a. When using a guided component 20, the end-to-end connection between the component 20 and the end 14b1 of the tube 14a can be achieved, for example, by welding or brazing, as... Figure 4 As shown. The inner diameter D1 and outer diameter D2 of this part 20a are basically the same as the inner diameter and outer diameter of the inner tube 14a.

[0062] The end portion 14a1 or the remainder of the member 20 has a cylindrical outer surface 20c, the outer diameter D3 of which is less than D2 and greater than D1. At the end portion 20b opposite to the portion 20a, the end portion 14a1 or the member 20 includes at least one outer annular groove 22 for receiving an annular seal 24.

[0063] In the example shown, end 14a1 or member 20 includes two adjacent grooves 22, and thus carries two seals 24. Figure 4 ).

[0064] Preferably, the seal 24 is made of an elastomer. In a variation, the seal may be made of metal.

[0065] End 14a1 or component 20 is intended to engage in housing 26 of connector 12, and seal 24 is intended to engage with the cylindrical surface of housing 26.

[0066] Now, referring to Figure 5Connector 12 is shown.

[0067] The connector 12 is presented in the form of a block of material, which may be, for example, metal or plastic.

[0068] The connector 12 has a generally parallelepiped shape and includes an upper surface 12a, a lower surface 12b, and a side surface 12c.

[0069] Connector 12 includes three ports 28, 30, and 32. Port 28 is located on one of the surfaces of surface 12c and leads to a hole 34 that includes housings 18 and 26.

[0070] Ports 30 and 32 are generally parallel to each other and perpendicular to port 28 and to the axis of hole 34, which is intended to coincide with the axis X of switch 14.

[0071] Ports 30 and 32 are located on the upper surface 12a and are spaced apart from each other. For fluid communication between the pipe or connector and connector 12, ports 30 and 32 form, for example, concave elements configured to mate with convex elements of the pipe or connector. Port 30 is located on one side of port 28 and opens into cavity 36 of bore 34, while port 32 is located on the opposite side of port 28 and opens into another cavity 38 of bore 34.

[0072] Furthermore, between ports 30 and 32, surface 12a of connector 12 includes a threaded aperture 40 for receiving a retaining screw of connector 12 onto a component of the vehicle or another fluid connector.

[0073] In the example shown, the aperture 34 is hierarchical and thus comprises multiple successive stages of different diameters, and is formed in particular by the housings 18, 26 and cavities 36, 38.

[0074] The hole 24 first includes a housing 18, which is connected to the port 28 and the face 12c by a first chamfer 42. The housing 18 has an outer diameter D4.

[0075] Then, the hole 24 includes a cavity 36 that extends between the housing 18 and the chamfer 44 for connection to another housing 26. The cavity 36 has an outer diameter D5, and the housing 26 has an outer diameter D6, with D5 between D4 and D6.

[0076] The outer casing 18 is connected to the cavity 36 via a cylindrical seat 46.

[0077] Finally, the hole 34 includes a cavity 38 which is connected to the housing 26 by another cylindrical seat 48 and terminated by a blind hole 50 near the surface 12c opposite to the port 28.

[0078] Cavity 38 has an outer diameter D7, which is smaller than D6.

[0079] D4 is basically equal to or slightly larger than the outer diameter Dext of the free end 14b1 of the outer tube 14b. Figure 4 ).

[0080] D6 is substantially equal to or slightly larger than the outer diameter D3 of the end 20b of component 20 or the free end 14a1 of inner tube 14a.

[0081] Now refer to Figure 7 Describe the connection between switch 12 and connector 14. Figure 7 The steps of the connection method are shown.

[0082] The method includes a first step a): In this first step, the free end 14b1 of the outer tube 14b is engaged in the housing 18 of the connector 12. A chamfer 42 facilitates the insertion of the end 14b1 into the port 28, continuing until it abuts against the seat 46. The outer tube 14b forms a convex portion that engages in the concave portion of the housing 18. However, the reverse can be considered, whereby the free end 14b1 then forms a concave portion that engages in the convex portion of the connector 12. This engagement can be performed manually by the operator.

[0083] The method includes the following step b): directly securing the outer tube 14b to the connector 12. In the case that both components are made of a metal alloy, this securing can be achieved by, for example, TIG-type welding, followed by forming a circumferential weld 52 around the outer tube 14b at port 28 and chamfer 42. Figure 4 When fixation is achieved by brazing, the brazing is almost invisible to the naked eye and is located, for example, mainly within the housing 18.

[0084] When tube 14b and connector 12 are made of plastic or composite materials, the fixation can be ensured by gluing, electron beam welding, etc.

[0085] Starting from step b), the outer tube 14b is secured to the connector 12, and the inner tube 14a is not yet present in the device 10. Then, the channel C1 is in fluid communication with the port 30 through the cavity 36.

[0086] Install the inner tube 14a in step c). The inner tube 14a is inserted into the outer tube 14b until the free end 14a1 of the inner tube is engaged in the housing 26 of the connector 12.

[0087] The chamfer 44 facilitates the insertion of end 14a1 into housing 26 and continues until it abuts against seat 48. Inner tube 14a also forms a convex portion engaging in the concave portion of housing 26. However, the opposite can be considered, thus the free end 14a1 forms a concave portion engaging the convex portion of connector 12. This engagement can be performed manually by the operator. It is understood that, within the range of relatively stiff tubes, these tubes are preferably straight to facilitate step c).

[0088] The mounting of the inner tube 14a in the connector 12 ensures a seal only between the inner tube and the connector. Therefore, there is no need to provide direct fastening between these components.

[0089] The seal can be ensured by a simple engagement or simple support of the complementary cylindrical surfaces between the inner tube 14a and the connector 12.

[0090] In the example shown in the attached figure, as described above, a seal is ensured by seal 24, and the number and material of the seals can be adapted.

[0091] Therefore, channel C2 is in fluid communication with port 32 through cavity 38.

[0092] In the case described above and shown, the method includes two additional optional steps between steps b) and c), one of which includes shaping the free end 14a1 of the inner tube 14a or then the member 20 applied to the end of the tube, and then installing the seal 24 in the groove 22 of the free end 14a1.

[0093] Finally, the method includes step d): in step d), tubes 14a and 14b are fixed together to avoid relative displacement between the tubes.

[0094] This fixing can be achieved by shaping the switch 14, and in particular by bending the switch, as described above. Figure 2 Therefore, tubes 14a and 14b are plastically deformed and clamped together abutting each other, thus preventing any relative movement between the tubes.

[0095] Fixing can be achieved by plastic deformation of one of the tubes (e.g., outer tube 14b), which is pressed against the inner tube 14a at a specific position E (see...). Figure 8 In the example shown, the crimping is transmitted through plastic deformation and recess 54 in the outer tube 14b to support the inner tube 14a.

[0096] Furthermore, this fixation can be achieved by welding the ends of tubes 14a and 14b, which are opposite to connector 12 and thus located on one side of another connector 16, together.

[0097] This invention enables a sealed fluid connection between the exchanger 14 and the connector 12 without blind welding, while limiting the size of the device 10.

Claims

1. A method for sealing a connector (12) to a coaxial tubular heat exchanger (14), The heat exchanger includes two coaxial tubes, an inner tube (14a) and an outer tube (14b). The outer tube defines a first annular channel (C1) around the inner tube for the flow of a first fluid, and the inner tube defines a second inner channel (C2) for the flow of a second fluid. The inner and outer tubes are independent of each other, and one of the inner and outer tubes includes a protrusion (15) adjacent to the other tube to maintain a distance between the inner and outer tubes. The connector includes two cavities (36, 38) for fluid passage, the two cavities (36, 38) communicating with the first annular channel (C1) and the second inner channel (C2) of the heat exchanger, respectively. Its features are, The method includes the following sequential steps: a) The free end (14b1) of the outer tube is installed inside the connector (12), b) The outer tube (14b) is directly fixed to the connector. At least one annular seal (24) is installed around the free end (14a1) of the inner tube (14a). c) The inner tube (14a) is inserted into the outer tube (14b) until the free end (14a1) of the inner tube is installed in the connector (12), which ensures a seal between the inner tube and the connector. The free end (14a1) of the inner tube (14a) is formed from a single component or the free end (14a1) of the inner tube (14a) is formed by fixing a tubular member (20) to the end (14a2) of the inner tube (14a). d) The inner tube (14a) and the outer tube (14b) are directly fixed to each other to avoid relative displacement.

2. The method according to claim 1, wherein, Step d) is performed by plastic deformation of at least one of the inner tube (14a) and the outer tube (14b).

3. The method according to claim 1 or 2, wherein, In steps a) and c), the inner tube (14a) and the outer tube (14b) are respectively engaged in the two housings (18, 26) of the connector by a convex-concave interlock.

4. The method according to claim 3, wherein, In steps a) and c), the inner tube (14a) and the outer tube (14b) are guided at the entrance of the housing (18, 26) by engaging the free ends (14a1, 14b1) of the inner tube and the outer tube with the chamfer (42, 44) of the connector (12).

5. The method according to claim 1 or 2, wherein, Prior to step c), the free end (14a1) of the inner tube (14a) or the tubular member (20) is plastically deformed to form at least one annular groove (22) at the free end of the inner tube or the outer periphery of the tubular member.

6. The method according to claim 1 or 2, wherein, Prior to step c), the free end (14a1) of the inner tube (14a) or the tubular member (20) is plastically deformed to change the outer diameter (D2, D3) of the free end of the inner tube or the tubular member at at least one end.

7. The method according to claim 1 or 2, wherein, The inner tube (14a) and the outer tube (14b) are made of metal.

8. The method according to claim 1 or 2, wherein, The inner tube (14a) and the outer tube (14b) are made of different materials.

9. The method according to claim 8, wherein, The inner tube (14a) is metal, and the outer tube (14b) is made of plastic or composite material.

10. The method according to claim 1 or 2, wherein, The outer tube (14b) is fixed to the connector (12) by welding or gluing.

11. The method according to claim 1 or 2, wherein, The connector (12) is made of metal.

12. The method according to claim 1, wherein, The method is for an air conditioning circuit in a motor vehicle.

13. The method according to claim 2, wherein, Step d) is performed by pressing the outer tube onto the inner tube, or by bending the inner tube and the outer tube simultaneously.

14. The method according to claim 1 or 2, wherein, Prior to step c), the free end (14a1) of the inner tube (14a) or the component (20) undergoes plastic deformation to form two annular grooves (22) adjacent to the free end of the inner tube or the outer periphery of the component.

15. The method according to claim 1 or 2, wherein, The outer tube (14b) is fixed to the connector (12) by brazing.

16. A fluid connection device (10) including a connector (12) and a coaxial tubular heat exchanger (14). The connector forms two cavities (36, 38) for fluid passage, which are respectively connected to the first annular channel (C1) and the second inner channel (C2) of the heat exchanger. The heat exchanger includes two coaxial tubes, an inner tube (14a) and an outer tube (14b). The outer tube defines a first annular channel (C1) around the inner tube for the flow of a first fluid, and the inner tube defines a second inner channel (C2) for the flow of a second fluid. The inner and outer tubes are independent, and one of the inner and outer tubes includes a protrusion (15) adjacent to the other tube to maintain a distance between the inner and outer tubes. Its features are, The fluid connection device is obtained by the method according to any one of claims 1 to 15, and: The outer tube (14b) includes a free end (14b1) that engages within the connector (12), the outer tube being directly fixed to the connector, and The inner tube (14a) includes a free end (14a1) mounted within the connector, which ensures a seal between the inner tube and the connector. The free end (14a1) of the inner tube (14a) is formed from a single component or the free end (14a1) of the inner tube (14a) is formed by fixing a tubular member (20) to the end (14a2) of the inner tube (14a), and at least one annular seal (24) is mounted around the free end (14a1) of the inner tube (14a). The inner tube (14a) and the outer tube (14b) are directly fixed to each other to avoid relative displacement.

17. The fluid connection device (10) according to claim 16, wherein, The inner tube (14a) and the outer tube (14b) are fixed by pressing the outer tube onto the inner tube, bending the inner tube and the outer tube simultaneously, or welding the ends of the inner tube and the outer tube opposite to the connector.

18. The fluid connection device (10) according to claim 16, wherein, The fluid connection device is a fluid connection device for the air conditioning circuit of a motor vehicle.

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