Flexible low permeation tubing assembly

Abstract

The utility model provides a kind of flexible low-permeability pipeline assembly, it is related to pipeline system technical field, including rubber tube, flexible bellows, metal pipe and buckling piece, wherein, flexible bellows inserts and is installed in the inside of rubber tube;Metal pipe includes metal pipe body and the metal pipe joint connected in metal pipe body one end;Metal pipe body is located in the outside of rubber tube;Metal pipe joint is worn in flexible bellows inside, and glue is coated on the outer surface of metal pipe joint, and the outer surface of metal pipe joint and the inner surface of flexible bellows concave-convex cooperation;Buckling piece is sleeved in the outside of rubber tube end region and under the action of external force along the radial direction of rubber tube, and rubber tube and flexible bellows are pressed solid in the outside of metal pipe joint.The flexible low-permeability pipeline assembly provided by the utility model solves the technical problem that existing pipeline cannot consider flexible and low-permeability double requirements.

Description

Technical Field

[0001] This utility model relates to the field of pipeline system technology, and in particular to a flexible low-permeability pipeline assembly. Background Technology

[0002] As a crucial component of automotive air conditioning systems, the performance of the air conditioning piping assembly directly impacts the reliability and comfort of the entire system. In existing technologies, air conditioning piping assemblies typically consist of three parts: rubber hoses, metal hoses, and crimp connectors. To ensure the assembly's pressure resistance, grooves are usually machined at the metal hose connections, and the rubber hose is then crimped into these grooves using crimp connectors. This structural design effectively improves pull-out resistance, thereby enhancing pressure resistance.

[0003] Regarding refrigerant permeability, existing technologies generally use resin materials such as PA6 (Polyamide 6, commonly known as nylon 6 or nylon 6, a thermoplastic polymer resin) as a shielding layer, placing it in the middle or innermost layer of the hose. While this design effectively reduces refrigerant permeability, the addition of resin materials increases the overall rigidity of the hose, leading to a significant decrease in vibration damping. Furthermore, to further improve the hose's permeability, existing technologies often employ multi-layer resin composites, but this requires increasing the thickness of the resin layers, further exacerbating the problem of increased hose rigidity and further worsening vibration damping performance.

[0004] Therefore, it is evident that existing technologies, while pursuing low permeability, inevitably sacrifice the vibration damping effect of the hose, making it difficult to simultaneously meet the two key performance indicators of low permeability and good vibration damping. This technological limitation restricts the overall performance improvement of automotive air conditioning systems to some extent, especially in application scenarios where vibration damping requirements are high during vehicle operation. Utility Model Content

[0005] The purpose of this invention is to provide a flexible, low-permeability pipeline assembly to alleviate the technical problem that existing pipelines cannot simultaneously meet the dual requirements of flexibility and low permeability.

[0006] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions: In a first aspect, this utility model provides a flexible, low-permeability pipeline assembly, comprising: Rubber hose; A flexible corrugated tube is inserted inside the rubber tube; A metal tube includes a metal tube body and a metal tube connector connected to one end of the metal tube body; the metal tube body is located outside the rubber tube; the metal tube connector is inserted inside the flexible corrugated tube, the outer surface of the metal tube connector is coated with adhesive, and the outer surface of the metal tube connector is in concave-convex fit with the inner surface of the flexible corrugated tube. A clamping fitting is fitted onto the outside of the end region of the hose and, under the action of external force, presses the hose and the flexible corrugated pipe radially to the outside of the metal pipe joint.

[0007] In an optional embodiment, the crimping component is a crimping sleeve made of metal material, including a crimping tube body and an annular end plate connected to one end of the crimping tube body. The annular end plate is fitted onto the outside of the metal tube, and the crimping tube body is fitted onto the outside of the rubber tube and pressed against the outer surface of the rubber tube under external force.

[0008] In an optional embodiment, the outer surface of the flexible corrugated tube is in frictional engagement with the inner surface of the tubing.

[0009] In an optional embodiment, the flexible corrugated tube is a resin tube or a plastic tube; and / or, the crimping sleeve is made of aluminum, where “and / or” means that the feature before “and / or” and the feature after “and / or” are satisfied simultaneously or selectively.

[0010] In an optional embodiment, the metal tube body and the metal tube connector are integrally formed.

[0011] In an optional embodiment, the outer surface of the metal pipe joint is provided with a plurality of annular protrusions, and at least some of the annular protrusions are embedded one-to-one in the annular grooves on the inner surface of the flexible corrugated pipe.

[0012] In an optional embodiment, at least two annular protrusions on the outer surface of the metal pipe joint are embedded in at least two annular grooves on the inner surface of the flexible corrugated pipe.

[0013] In an optional embodiment, all of the annular grooves are arranged in a threaded pattern on the inner surface of the flexible bellows, and all of the annular protrusions are arranged in a threaded pattern on the outer surface of the metal pipe joint.

[0014] In an optional embodiment, there are two metal tubes and two crimping members; the metal tube joints of the two metal tubes are respectively inserted inside the two ends of the flexible corrugated tube; the two crimping members are respectively fitted outside the two ends of the hose and, under the action of external force, press the hose and the flexible corrugated tubes provided inside the corresponding end areas of the hose to the outside of the corresponding metal tube joints along the radial direction of the hose.

[0015] In an optional implementation, the flexible, low-permeability piping assembly is used in an automotive air conditioning piping system.

[0016] The embodiments of this utility model can achieve at least the following beneficial effects: In the flexible low-permeability piping assembly provided in this embodiment, the outer surface of the metal pipe joint and the inner surface of the flexible corrugated pipe form a mechanical concave-convex interlocking structure. The outer surface of the metal pipe joint is coated with adhesive, which not only enhances the pull-out resistance between the two but also effectively prevents rotational loosening, improving the stability of the connection interface. In the entire structure, the rubber hose provides external protection and initial sealing, the flexible corrugated pipe serves as the main barrier layer to prevent refrigerant penetration, the concave-convex fit between the metal pipe joint and the flexible corrugated pipe further enhances the sealing effect, and the crimping component radially compresses the rubber hose and the internal flexible corrugated pipe under external force, tightly wrapping them around the metal pipe joint to form a multi-layered compression sealing structure. This effectively prevents refrigerant leakage, improves the fluid tightness of the entire piping system, and achieves long-term stable and reliable fluid tightness and connection strength, meeting the safety requirements of high-pressure operation of the piping system.

[0017] This flexible, low-permeability piping assembly can be applied to air conditioning piping systems. Using a flexible corrugated pipe as a refrigerant barrier layer, it meets the refrigerant permeability resistance requirements while offering better flexibility compared to a straight structure. Furthermore, the design incorporates a metal pipe joint with a convex-concave fit between its outer surface and the inner surface of the flexible corrugated pipe. The outer surface of the metal pipe joint is coated with adhesive and mates with a crimping fitting. This ensures that the connection strength and fluid sealing requirements of the air conditioning piping are met while maintaining its flexibility. Thus, it simultaneously satisfies the dual requirements of low permeability and flexibility in air conditioning piping, solving the technical problem of existing piping systems being unable to simultaneously meet these two requirements.

[0018] In addition, the waveform of the flexible corrugated pipe is repeating continuously. The flexible corrugated pipe can be cut according to the total length of the pipeline, so that it can be matched and connected with the metal pipe without the need to make a special joint for the flexible corrugated pipe to connect with the metal pipe. This makes it more convenient to use and can reduce production costs.

[0019] In addition, this utility model embodiment also provides several optional implementation methods. The specific implementation method section of this specification will provide a detailed description and explanation of the specific structure and functional effects of these optional implementation methods. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the overall structure of the flexible low-permeability pipeline assembly provided in this embodiment of the utility model; Figure 2 A cross-sectional view of the overall structure of the flexible low-permeability pipeline assembly provided in this embodiment of the utility model; Figure 3 for Figure 2 Enlarged view of the local structure of region A in the middle.

[0022] Icons: 1- Rubber hose; 2- Flexible corrugated pipe; 3- Metal pipe; 31- Metal pipe body; 32- Metal pipe fitting; 4- Crimping fitting; 41- Crimping pipe body; 42- Annular end plate. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar labels and letters in the accompanying drawings indicate similar items. Therefore, once an item is defined in one accompanying drawing, it does not need to be further defined and explained in subsequent accompanying drawings.

[0026] In the description of this utility model, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] Furthermore, the terms "horizontal" and "vertical" do not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] This embodiment provides a flexible, low-permeability piping assembly, referring to... Figures 1 to 3 The flexible low-permeability piping assembly includes a rubber hose 1, a flexible corrugated pipe 2, a metal pipe 3, and a crimping fitting 4.

[0031] Specifically, the flexible corrugated tube 2 is inserted inside the rubber tube 1. The metal tube 3 includes a metal tube body 31 and a metal tube connector 32 connected to one end of the metal tube body 31; the metal tube body 31 is located outside the rubber tube 1; the metal tube connector 32 is inserted inside the flexible corrugated tube 2, and the outer surface of the metal tube connector 32 is coated with adhesive, and the outer surface of the metal tube connector 32 has a concave-convex fit with the inner surface of the flexible corrugated tube 2. The clamping member 4 is fitted outside the end area of ​​the rubber tube 1 and, under the action of external force, presses the rubber tube 1 and the flexible corrugated tube 2 radially along the rubber tube 1 to the outside of the metal tube connector 32.

[0032] In the flexible low-permeability piping assembly provided in this embodiment, the outer surface of the metal pipe joint 32 and the inner surface of the flexible corrugated pipe 2 form a mechanical concave-convex interlocking structure. The outer surface of the metal pipe joint 32 is coated with adhesive, which not only enhances the pull-out resistance between the two but also effectively prevents rotational loosening, improving the stability of the connection interface. In the entire structure, the hose 1 provides external protection and initial sealing, the flexible corrugated pipe 2 serves as the main barrier layer to prevent refrigerant penetration, the concave-convex fit between the metal pipe joint 32 and the flexible corrugated pipe 2 further enhances the sealing effect, and the clamping member 4 radially compresses the hose 1 and the internal flexible corrugated pipe 2 under external force, tightly covering the outside of the metal pipe joint 32, forming a multi-layered compression sealing structure. This effectively prevents refrigerant leakage, improves the fluid tightness of the entire piping system, and achieves long-term stable and reliable fluid tightness and connection strength, meeting the safety requirements of high-pressure operation of the piping system.

[0033] This flexible, low-permeability piping assembly can be applied to air conditioning piping systems. Using a flexible corrugated pipe 2 as a refrigerant barrier layer, it meets the refrigerant permeability resistance requirements. Furthermore, the corrugated structure offers better flexibility compared to a straight structure. The design of the metal pipe connector 32, with its outer surface conforming to the inner surface of the flexible corrugated pipe 2 and coated with adhesive, along with its engagement with the crimping fitting 4, ensures both connection strength and fluid sealing requirements for the air conditioning piping while maintaining its flexibility. This simultaneously satisfies the dual requirements of low permeability and flexibility in air conditioning piping, solving the technical problem of existing piping systems being unable to simultaneously meet both requirements.

[0034] In addition, the waveform of the flexible corrugated pipe 2 is repeating and continuous. The flexible corrugated pipe 2 can be cut according to the total length of the pipeline so that it can be matched and connected with the metal pipe 3 without the need to make a specific joint for the flexible corrugated pipe 2 to connect with the metal pipe 3. This makes it more convenient to use and can reduce production costs.

[0035] It should be noted that, in this embodiment, for the single structural component of hose 1, to improve the strength and wear resistance of hose 1, hose 1 can be designed as a three-layer, four-layer, or more composite material pipe. Its innermost layer is made of plastic or other wear-resistant material, and the remaining layers may include fiber reinforcement layers or steel wire reinforcement layers. For the single structural component of flexible corrugated pipe 2, it can be designed as a single-layer or multi-layer composite material pipe. Optionally, flexible corrugated pipe 2 is a resin pipe or a plastic pipe. For the single structural component of metal pipe 3, it can be made of any metal material such as aluminum, steel, iron, or copper. The metal pipe body 31 and the metal pipe joint 32 can be an integrally formed structure or a structure formed by welding two parts. To ensure better fluid sealing, an integrally formed structure is preferred. For the crimping component 4, it can be a clamping or crimping ring structure, and can be made of any metal material such as aluminum, steel, iron, or copper. It is preferred to be made of aluminum to facilitate crimping and shaping, while reducing production costs.

[0036] In an optional embodiment of this example, the crimping member 4 is a crimping sleeve made of metal material, including a crimping tube body 41 and an annular end plate 42 connected to one end of the crimping tube body 41. The annular end plate 42 is fitted onto the outside of the metal tube 3, and the crimping tube body 41 is fitted onto the outside of the rubber tube 1 and pressed against the outer surface of the rubber tube 1 under external force. In this optional embodiment, the crimping tube body 41 is fitted onto the outside of the rubber tube 1 and compresses the rubber tube 1 radially under external force, making it tightly cover the outside of the metal tube connector 32. The annular end plate 42 is fitted onto the outside of the metal tube 3, serving as an auxiliary fixation and limiting function. This design, through a multi-point fixing mechanism, ensures a tight connection between the rubber tube 1, the flexible corrugated tube 2, and the metal tube connector 32, enhancing the overall strength and stability of the connection. At the same time, the crimping tube body 41 uniformly compresses the rubber tube 1 radially under external force, so that the rubber tube 1 and the flexible corrugated tube 2 are subjected to uniform pressure on the entire contact surface, avoiding local stress concentration and improving the reliability and durability of the connection.

[0037] In an optional embodiment of this example, the outer surface of the flexible corrugated pipe 2 and the inner surface of the hose 1 are in frictional engagement. In this optional embodiment, the frictional engagement design between the flexible corrugated pipe 2 and the hose 1 makes the installation process simpler, eliminating the need for additional fasteners or complex assembly steps, thus reducing assembly time and costs. In addition, the frictional engagement design ensures that the flexible corrugated pipe 2 maintains a good connection state during repeated bending and stretching, making it less prone to loosening or falling off, thus guaranteeing the long-term reliability of the connection.

[0038] In this embodiment, in the structure where the outer surface of the metal pipe joint 32 and the inner surface of the flexible corrugated pipe 2 are in a concave-convex fit, the concave and convex parts of each set of concave-convex fits can be one or more protrusions arranged circumferentially on the metal pipe joint 32 and a ring groove of the flexible corrugated pipe 2, or other fit forms. To improve the stability of the connection between the two, in an optional embodiment of this embodiment, a plurality of ring protrusions are provided on the outer surface of the metal pipe joint 32. Each ring protrusion extends circumferentially along the metal pipe joint 32 without interruption. Among these ring protrusions, at least some of the ring protrusions are embedded one-to-one in a portion of the ring groove on the inner surface of the flexible corrugated pipe 2. For example, when there are five ring protrusions, only one, two, three or four ring protrusions can be in a concave-convex fit with the corresponding ring groove, or all the ring protrusions can be embedded one-to-one in a ring groove.

[0039] In this optional embodiment, at least two annular protrusions on the outer surface of the metal pipe joint 32 are embedded in at least two annular grooves on the inner surface of the flexible corrugated pipe 2, thereby ensuring the stability of the connection and the fluid sealing of the joint between the metal pipe joint 32 and the flexible corrugated pipe 2.

[0040] Optionally, all the annular grooves are arranged in a spiral pattern on the inner surface of the flexible bellows 2, and all the annular protrusions are arranged in a spiral pattern on the outer surface of the metal pipe joint 32.

[0041] like Figure 1 and Figure 2 As shown, in an optional embodiment of this example, there are two metal tubes 3 and two crimping fittings; the metal pipe joints 32 of the two metal tubes 3 are respectively installed inside the two ends of the flexible corrugated pipe 2; the two crimping fittings 4 are respectively fitted outside the two end areas of the hose 1 and, under the action of external force, press the hose 1 and the flexible corrugated pipe 2 provided inside the corresponding end areas of the hose 1 to the outside of the corresponding metal pipe joints 32 along the radial direction of the hose 1, thereby splicing a complete pipeline system. When the crimping fitting 4 is a crimping sleeve, the annular end plates 42 of the two crimping sleeves are respectively fitted outside the corresponding metal tubes 3, and the crimping tube bodies 41 of the two crimping sleeves are respectively fitted outside the two ends of the hose 1 and pressed to the outer surface of the hose 1 under the action of external force.

[0042] In an optional embodiment of this example, the flexible low-permeability piping assembly is applied to an automotive air conditioning piping system. However, it should be noted that the flexible low-permeability piping assembly provided in this example is not only applicable to automotive air conditioning piping systems, but also to refrigeration and freezing equipment, industrial refrigeration units, and household and commercial air conditioning piping systems. It is particularly suitable for refrigerant delivery applications that require long life, low leakage, and flexible installation.

[0043] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. The above embodiments in this specification are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A flexible, low-permeability pipeline assembly, characterized in that, include: Rubber hose (1); A flexible corrugated tube (2) is inserted into the inside of the rubber tube (1); The metal tube (3) includes a metal tube body (31) and a metal tube connector (32) connected to one end of the metal tube body (31); the metal tube body (31) is located outside the rubber tube (1); the metal tube connector (32) is inserted inside the flexible corrugated tube (2), the outer surface of the metal tube connector (32) is coated with glue, and the outer surface of the metal tube connector (32) is in concave-convex fit with the inner surface of the flexible corrugated tube (2); The clamping member (4) is fitted outside the end area of ​​the hose (1) and, under the action of external force, presses the hose (1) and the flexible corrugated pipe (2) to the outside of the metal pipe joint (32) along the radial direction of the hose (1).

2. The flexible low-permeability pipeline assembly according to claim 1, characterized in that, The crimping component (4) is a crimping sleeve made of metal material, including a crimping tube body (41) and an annular end plate (42) connected to one end of the crimping tube body (41). The annular end plate (42) is fitted outside the metal tube (3), and the crimping tube body (41) is fitted outside the rubber tube (1) and pressed against the outer surface of the rubber tube (1) under the action of external force.

3. The flexible low-permeability pipeline assembly according to claim 1, characterized in that, The outer surface of the flexible corrugated tube (2) is in frictional engagement with the inner surface of the rubber tube (1).

4. The flexible low-permeability pipeline assembly according to claim 1, characterized in that, The flexible corrugated pipe (2) is a resin pipe or a plastic pipe; And / or, the fastening element (4) is made of aluminum.

5. The flexible low-permeability pipeline assembly according to claim 1, characterized in that, The metal tube body (31) and the metal tube connector (32) are integrally formed.

6. The flexible low-permeability pipeline assembly according to claim 1, characterized in that, The outer surface of the metal pipe joint (32) is provided with a plurality of annular protrusions, and at least some of the annular protrusions are embedded one-to-one in the annular grooves on the inner surface of the flexible corrugated pipe (2).

7. The flexible low-permeability pipeline assembly according to claim 6, characterized in that, At least two annular protrusions on the outer surface of the metal pipe joint (32) are embedded in at least two annular grooves on the inner surface of the flexible corrugated pipe (2).

8. The flexible low-permeability pipeline assembly according to claim 6, characterized in that, All of the annular grooves are arranged in a threaded manner on the inner surface of the flexible corrugated pipe (2), and all of the annular protrusions are arranged in a threaded manner on the outer surface of the metal pipe joint (32).

9. The flexible low-permeability pipeline assembly according to claim 1, characterized in that, The metal tube (3) and the fastening member (4) are each available in two; The metal pipe joints (32) of the two metal pipes (3) are respectively installed inside the two ends of the flexible corrugated pipe (2); The two clamping members (4) are respectively fitted onto the outside of the two ends of the hose (1) and, under the action of external force, press the hose (1) and the flexible corrugated pipe (2) provided inside the corresponding end area of ​​the hose (1) along the radial direction of the hose (1) to the outside of the corresponding metal pipe joint (32).

10. The flexible low-permeability pipeline assembly according to claim 1, characterized in that, The flexible, low-permeability piping assembly is used in automotive air conditioning piping systems.

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