Air conditioning ducts

Abstract

This utility model provides an air conditioning pipeline, relating to the field of air conditioning technology and applied to air conditioning systems for new energy vehicles. Specifically, it includes a metal connector, an intake pipe, a liquid pipe, and a seal. This utility model utilizes a metal connector with a reverse tooth structure and an intake pipe and liquid pipe fitted over its flange joint. An annular seal is installed at the pipeline connection using a fusion welding method. One end of the seal engages with the reverse teeth on the side wall of the metal connector and the outer wall of the flange joint, while the other end is fitted onto the outer wall of the pipeline and fits tightly against it. This effectively enhances the connection stability of the metal-plastic interface, mitigates the risk of low-temperature shrinkage and separation due to the difference in thermal expansion coefficients, and improves the sealing reliability of the pipeline under complex conditions such as high pressure and vibration. It also eliminates the need for a metal support in traditional structures, achieving lightweighting and structural compactness while ensuring the long lifespan and sealing performance of the air conditioning liquid pipeline connection.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and more specifically, to an air conditioning pipe system. Background Technology

[0002] In the field of new energy vehicles, lightweight and compact design of in-vehicle air conditioning pipes is of paramount importance.

[0003] In traditional all-plastic air conditioning duct systems, additional metal supports are often needed to secure and support the ductwork within the limited space occupied by components such as batteries and motors. The connectors in these duct systems are typically made of translucent plastic, with matching metal fittings.

[0004] Because of the huge difference in the coefficients of thermal expansion between plastic and metal (plastic is about 3-4 times that of metal), when the operating temperature changes drastically, especially in low-temperature environments, the shrinkage rates of the two materials are inconsistent, which can easily create gaps at the joint interface, causing the two materials to separate and leading to the risk of seal failure. Utility Model Content

[0005] The purpose of this utility model is to provide an air conditioning pipe to alleviate the technical problem in the prior art where gaps easily form at the connection interface when the operating temperature changes drastically, causing the two materials to separate and leading to the risk of seal failure.

[0006] This utility model provides an air conditioning pipeline for use in the air conditioning system of new energy vehicles, including: metal connectors, air intake pipes, liquid pipes and seals.

[0007] The metal connector includes a connecting body, on which at least two flange joints with outwardly convex structures are formed. The outer side wall of the flange joint near the connecting body and the end face of the connecting body facing the flange joint are provided with reverse teeth.

[0008] The suction pipe is used to transport low-pressure gaseous refrigerant, and the suction pipe is sleeved outside one of the flange joints and spaced apart from the inverted teeth.

[0009] The liquid pipe is used to transport high-pressure, low-temperature liquid refrigerant. The liquid pipe is sleeved outside another flange joint and spaced apart from the inverted teeth.

[0010] The sealing element is a ring and there are two of them. The two sealing elements are respectively disposed between the flange joint and the suction pipe, and between the flange joint and the liquid pipe by fusion welding. One end of the sealing element engages with the reverse teeth, and the other end is sleeved on the outside of the liquid pipe and the suction pipe, with the inner wall of the sealing element in contact with the outer wall of the liquid pipe and the suction pipe.

[0011] Furthermore, the air conditioning piping also includes a first sealing ring.

[0012] The first sealing ring is sleeved on the outside of the flange joint. There are two first sealing rings, which are respectively disposed between the sealing element and the suction pipe, and between the sealing element and the liquid pipe.

[0013] Furthermore, the air conditioning piping also includes a second sealing ring.

[0014] The side of the metal connector away from the flange joint has a plurality of metal connector heads, and each metal connector head is provided with a mounting groove extending circumferentially.

[0015] There are multiple second sealing rings, and each of the multiple second sealing rings is disposed in a corresponding mounting groove on a plurality of metal connector heads.

[0016] Furthermore, the air conditioning piping also includes a coaxial pipe.

[0017] The coaxial tube has a first channel and a second channel. The first channel is located outside the second channel. The first channel is connected to the liquid tube, and the second channel is connected to the suction tube.

[0018] Furthermore, the coaxial tube includes: a first barrier layer, a second barrier layer, and a third barrier layer.

[0019] The first barrier layer is used to prevent refrigerant from permeating into the coaxial tube.

[0020] The second barrier layer is used to prevent refrigerants from permeating into each other.

[0021] The third barrier layer is used to prevent refrigerant from permeating out of the first barrier layer.

[0022] The first barrier layer, the second barrier layer, and the third barrier layer 530 are coaxial and arranged sequentially from the outside to the inside. A first channel is formed between the first barrier layer and the second barrier layer, and a second channel is formed within the second barrier layer and the third barrier layer 530.

[0023] Furthermore, the coaxial tube also includes a water-blocking layer and an adhesive layer.

[0024] A water-blocking layer is disposed outside the second barrier layer and together with the inner wall of the first barrier layer to form the first channel.

[0025] An adhesive layer is disposed between the water-blocking layer and the second barrier layer, the adhesive layer bonding the water-blocking layer and the second barrier layer together.

[0026] Furthermore, the first channel has multiple channels and is arranged at circumferential intervals along the second channel.

[0027] Furthermore, the air conditioning piping also includes a tee connector.

[0028] The tee connector has a first connector, a second connector, and a third connector.

[0029] The first connector is connected to and communicates with the end of the liquid tube furthest from the metal connector.

[0030] The second connector is connected to and communicates with the end of the suction pipe that is away from the metal connector.

[0031] The third connector has a first flow channel and a second flow channel formed therein. The third connector is connected to the coaxial tube so that the first flow channel, the first connector and the first channel are connected, and the second flow channel, the second connector and the second channel are connected.

[0032] Furthermore, the first connector is inserted into the liquid tube, the second connector is inserted into the suction tube, and the third connector is inserted into the coaxial tube, and the connection is laser welded.

[0033] Furthermore, the first connector is perpendicular to and connected to the first flow channel.

[0034] The second connector is parallel to the axis of the second flow channel.

[0035] The first flow channel is located outside the second flow channel.

[0036] Beneficial effects: In this invention, a metal connector with a reverse tooth structure and an air intake pipe and a liquid pipe fitted over its flange joint are combined with an annular seal at the pipe connection using a fusion welding method. One end of the seal engages with the reverse teeth on the side wall of the metal connector and the outer wall of the flange joint, while the other end fits tightly against the outer wall of the pipe. This effectively enhances the connection stability of the metal-plastic interface and significantly mitigates the risk of low-temperature shrinkage and separation caused by the difference in their thermal expansion coefficients. At the same time, the seal provides a secondary seal for any micro-gaps that may be formed by laser welding, improving the sealing reliability of the pipe under complex conditions such as high pressure and vibration. It also eliminates the need for a metal support in traditional structures, achieving both lightweight and compact design while ensuring a long service life and high sealing performance for the air conditioning liquid pipe connection. Attached Figure Description

[0037] 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.

[0038] Figure 1 This is a schematic diagram of the structure of the air conditioning liquid pipeline provided in an embodiment of the present utility model; Figure 2 A schematic diagram illustrating the fit between metal connectors in an air conditioning liquid pipeline provided in this embodiment of the utility model; Figure 3 for Figure 2 Side sectional view; Figure 4 An enlarged view of the connection between the metal connector and the sealing ring in an air conditioning liquid pipeline provided in an embodiment of this utility model; Figure 5 This is a structural schematic diagram of the metal connector for the air conditioning liquid pipeline provided in an embodiment of the present utility model; Figure 6 A schematic diagram of the structure of the tee connector in the air conditioning liquid pipeline provided in this embodiment of the utility model; Figure 7 A schematic diagram showing the fit between the tee connector, the suction pipe, the coaxial pipe, and the liquid pipe in the air conditioning liquid pipeline provided in this embodiment of the utility model; Figure 8 A cross-sectional structural diagram of the coaxial tube in the air conditioning liquid pipeline provided in this embodiment of the utility model.

[0039] icon: 100. Metal connector; 110. First sealing ring; 120. Second sealing ring; 200. Suction pipe; 300. Liquid pipe; 400. Seal; 500. Coaxial pipe; 501. First channel; 502. Second channel; 510. First barrier layer; 520. Second barrier layer; 530. Third barrier layer; 600. T-connector; 610. First connector; 620. Second connector; 630. Third connector; 631. First flow channel; 632. Second flow channel. Detailed Implementation

[0040] 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, and 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.

[0041] 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.

[0042] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "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 product of this utility model 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.

[0044] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they 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.

[0045] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 mechanical connection or an electrical 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.

[0046] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0047] Combination Figures 1 to 8 The air conditioning piping provided in this embodiment is applied to the air conditioning system of a new energy vehicle, specifically including a metal connector 100, an air intake pipe 200, a liquid pipe 300, and a sealing component 400.

[0048] The metal connector 100 includes a connecting body, on which at least two flange joints with outwardly convex structures are formed. The outer side wall of the flange joint near the connecting body and the end face of the connecting body facing the flange joint are provided with reverse teeth.

[0049] The suction pipe 200 is used to transmit low-pressure gaseous refrigerant. The suction pipe 200 is sleeved on the outside of a flange joint and is spaced apart from the reverse teeth.

[0050] Liquid pipe 300 is used to transport high-pressure, low-temperature liquid refrigerant. Liquid pipe 300 is sleeved on another flange joint and spaced apart from it by reverse teeth.

[0051] The sealing element 400 is a ring and there are two of them. The two sealing elements 400 are respectively installed between the flange joint and the suction pipe 200 and between the flange joint and the liquid pipe 300 by fusion welding. One end of the sealing element 400 engages with the reverse teeth, and the other end is sleeved on the outside of the liquid pipe 300 and the suction pipe 200, and the inner wall is in contact with the outer wall of the liquid pipe 300 and the suction pipe 200.

[0052] In this embodiment, the metal connector 100 serves as the structural base of the entire connector assembly. Two flange connectors with outwardly protruding structures are respectively inserted into the suction pipe 200 and the liquid pipe 300 for communication. When the sealing element 400 is formed by fusion welding (specifically laser welding in this embodiment), the molten plastic flows into and fills each groove of the countersunk teeth. After cooling and solidification, these sealing elements 400 form a mechanical anchoring effect with the metal countersunk teeth. This connection method does not rely on the chemical bonding force of adhesives but is purely physical interlocking, effectively resisting axial peeling stress and circumferential shear stress caused by the inconsistent shrinkage / expansion of the plastic and metal. This prevents gaps from forming between the two materials under drastic temperature changes and mitigates the risk of low-temperature shrinkage and separation due to the difference in their thermal expansion coefficients.

[0053] In this embodiment, the sealing element 400 is a ring, fused and welded between the flange joint and the outer plastic pipe (suction pipe 200 / liquid pipe 300), forming a seamless, fused, continuous sealing layer as a sealing barrier. With this structure, the sealing element 400, through its ring shape, can bridge and seal microscopic, discontinuous welding defects, ensuring that even if individual welding defects exist during the welding process, the entire sealing ring remains effective. This improves the sealing reliability of the pipeline under complex conditions such as high pressure and vibration, and eliminates the need for metal supports in traditional structures. While achieving lightweight and compact design, it ensures a long service life and high sealing performance for the air conditioning liquid pipeline connection.

[0054] Furthermore, in this embodiment, both the intake pipe 200 and the liquid pipe 300 are connected to the metal connector 100, realizing the integration of the joints of the parallel pipelines, saving space and simplifying the assembly structure.

[0055] In this embodiment, the air conditioning pipeline also includes a first sealing ring 110.

[0056] The first sealing ring 110 is sleeved on the outside of the flange joint. There are two first sealing rings 110, which are respectively located between the sealing element 400 and the suction pipe 200, and between the sealing element 400 and the liquid pipe 300.

[0057] Specifically, during the injection molding of the seal 400, molten plastic is immersed into the countersunk teeth, cooled and solidified, resulting in a tighter bond between the plastic and the metal connector 100. This prevents the two materials from separating due to temperature changes. Furthermore, the seal 400 allows for welding to the suction pipe 200 and the liquid pipe 300. The first sealing ring, deformed axially along the flange joint, seals against leaks caused by poor welding gaps.

[0058] The first sealing ring 110 establishes an independent, physical sealing interface outside the original fusion-welded seal (seal 400), forming a sealing barrier. In extreme cases, if the seal 400 develops microcracks due to vibration fatigue or thermal stress, the first sealing ring 110 can still effectively block the leakage path and prevent seal failure. The first sealing ring 110 (a rubber ring in this embodiment) provides a flexible seal as a compressible element, better adapting to and compensating for minor deformations that may occur due to assembly tolerances, mechanical vibration, or long-term use, achieving a complementary advantage between static rigid sealing (seal 400) and dynamic flexible sealing. This further reduces the stringent requirements of the laser welding process, improves production yield, and makes the entire system more tolerant of minor defects in the manufacturing process.

[0059] In this embodiment, the double-sealing structure formed by the seal 400 and the first sealing ring 110 significantly enhances the overall pressure-bearing capacity of the connection interface. When the system pressure fluctuates, the two sealing rings can share the pressure load, reducing the stress on a single seal, thereby extending the service life and durability of the interface.

[0060] In this embodiment, the air conditioning pipeline also includes a second sealing ring 120.

[0061] The metal connector 100 has multiple metal connector heads on the side away from the flange joint, and each metal connector head has an installation groove extending circumferentially.

[0062] There are multiple second sealing rings 120, and each of the multiple second sealing rings 120 is set in a corresponding mounting groove on a multiple metal connector.

[0063] Specifically, in this embodiment, each metal connector is provided with two second sealing rings 120 spaced apart along its own axial direction. This ensures that all critical interfaces are effectively sealed throughout the entire path of refrigerant flowing from the metal connector into / out of the air conditioning pipeline provided in this embodiment, forming a complete sealing system. The second sealing rings 120 are fitted into the mounting groove, providing uniform sealing pressure, good vibration resistance, and high reliability, effectively preventing leakage at the interface that may be caused by machining accuracy, assembly stress, or system vibration.

[0064] In this embodiment, the air conditioning piping also includes a coaxial pipe 500.

[0065] A first channel 501 and a second channel 502 are formed inside the coaxial tube 500. The first channel 501 is located outside the second channel 502. The first channel 501 is connected to the liquid tube 300, and the second channel 502 is connected to the suction tube 200.

[0066] In this embodiment, the coaxial tube 500 is a sleeve structure, which combines the liquid tube 300 and the air intake tube 200, which are connected separately in parallel in the traditional system, into one. This significantly reduces the radial area occupied by the pipeline assembly in the narrow space of the vehicle, thus alleviating the "space-constrained" problem caused by the compression of the battery and motor in the prior art. At the same time, a single tube body replaces multiple parallel tubes, simplifying the pipe laying path and eliminating a large number of fixing clamps and supports, thereby simplifying the structure.

[0067] The coaxial tube 500 structure tightly connects the first channel 501 (outer side) for transmitting high-pressure, high-temperature liquid refrigerant with the second channel 502 (inner side) for transmitting low-pressure, low-temperature gaseous refrigerant, forming a built-in, high-efficiency heat exchanger. During its flow, the high-pressure liquid refrigerant releases heat to the low-pressure gaseous refrigerant. This increases the subcooling of the liquid refrigerant at the evaporator inlet, enhancing the evaporator's heat absorption capacity and resulting in better air conditioning cooling and lower outlet temperatures. Furthermore, the increased low-pressure suction temperature reduces the compressor load, thereby reducing compressor power consumption and improving overall system energy efficiency.

[0068] In this embodiment, the coaxial tube 500 includes a first barrier layer 510, a second barrier layer 520, and a third barrier layer 530.

[0069] The first barrier layer 510 is used to prevent refrigerant from permeating outside the coaxial tube 500. The second barrier layer 520 is used to prevent refrigerant from permeating into each other. The third barrier layer 530 is used to prevent refrigerant from permeating outside the first barrier layer 510.

[0070] Furthermore, the first barrier layer 510, the second barrier layer 520, and the third barrier layer 530 are coaxial and arranged sequentially from the outside to the inside. A first channel 501 is formed between the first barrier layer 510 and the second barrier layer 520, and a second channel 502 is formed between the second barrier layer 520 and the third barrier layer 530.

[0071] In this embodiment, the first barrier layer 510 prevents the refrigerant from permeating outward into the atmosphere, thus preventing environmental pollution and system performance degradation caused by refrigerant leakage. The second barrier layer 520 prevents the refrigerant from permeating between the first channel 501 and the second channel 502, ensuring that the high-pressure liquid refrigerant and the low-pressure gaseous refrigerant are completely isolated materially while efficiently exchanging heat, maintaining the purity and stability of the refrigerant state (pressure, phase) within their respective channels. The third barrier layer 530 further prevents the refrigerant from permeating outward and, together with the outer structure, forms a double protection for the second channel 502 (low-pressure gaseous refrigerant).

[0072] Specifically, in this embodiment, the first barrier layer 510, the second barrier layer 520, and the third barrier layer 530 are made of PA612, PA612, and PA6, respectively.

[0073] In this embodiment, the coaxial tube 500 further includes a water-blocking layer and an adhesive layer.

[0074] A water-blocking layer is disposed outside the second barrier layer 520 and together with the inner wall of the first barrier layer 510 to form a first channel 501. An adhesive layer is disposed between the water-blocking layer and the second barrier layer 520, and the adhesive layer bonds the water-blocking layer and the second barrier layer 520 together.

[0075] Specifically, in this embodiment, the water-blocking layer is made of EVOH material. This layer forms a directional defense barrier against environmental moisture, effectively preventing water vapor in the air from penetrating inward and entering and contaminating the refrigerant circulation system. This avoids the problem of water vapor freezing and damaging components such as the compressor, and prevents performance failure or component damage caused by icing (ice blockage) within the system, ensuring the long-term stable operation of the air conditioning system under various humidity conditions.

[0076] In this embodiment, the adhesive layer is specifically made of TIE material. The adhesive layer firmly bonds the second barrier layer 520 and the water-blocking layer, which have incompatible physical properties, into a complete whole. This ensures that the coaxial tube 500 will not delaminate, peel, or shift relative to each other under dynamic loads such as bending, vibration, and temperature cycling, thereby guaranteeing the long-term structural integrity and reliability of the multi-layer composite structure.

[0077] It should be noted here that the third barrier layer 530, the second barrier layer 520, the adhesive layer, the water-blocking layer, and the first barrier layer 510 can also be made of different materials and combined, such as: 1-PA612 / EVOH / TIE / PA612 / PA612, 2-PPA / EVOH / TIE / PA612 / PA612, 3-PPA / EVOH / TIE / PPA / PPA, 3-EFEP / TIE / EVOH / TIE / PA12.

[0078] The third barrier layer 530, the second barrier layer 520, and the first barrier layer 510 can also be combined using the following materials, such as: 1-PA6 / PA612 / PA612, 2-ETFE / PA12 / PA12, 3-ETFE / PA612 / PA612.

[0079] In this embodiment, there are multiple first channels 501, which are arranged at circumferential intervals along the second channel 502.

[0080] Multiple first channels 501 are arranged circumferentially along the second channel 502. This structure increases the heat exchange contact area between the two refrigerants, allowing the high-pressure liquid refrigerant to be surrounded and cooled by the low-temperature gaseous refrigerant from multiple directions simultaneously. This achieves all-round, multi-angle three-dimensional heat exchange, thereby significantly improving the subcooling and optimizing the system's energy efficiency and cooling effect exponentially.

[0081] Furthermore, multiple independent first channels 501 divert the total flow, effectively reducing the refrigerant flow resistance and pressure loss within a single channel. This not only helps reduce compressor power consumption but also makes the airflow distribution more uniform, reducing flow noise and vibration, thereby improving the overall stability and NVH (noise, vibration, and smoothness) performance of the air conditioning system.

[0082] Furthermore, the multiple circumferentially spaced first channels 501 form a support structure similar to a "honeycomb" or "reinforcing rib" outside the second channel 502, which enhances the radial compressive strength and circumferential stiffness of the coaxial tube 500. This gives it a deformation resistance far exceeding that of a single-channel structure when subjected to external extrusion, internal high pressure, and installation stress, preventing the pipeline from being crushed or undergoing irreversible deformation under complex working conditions, and ensuring the long-term unobstructed flow of the channel and the reliability of the system.

[0083] In this embodiment, the air conditioning pipeline also includes a tee connector 600. The tee connector 600 has a first connector 610, a second connector 620, and a third connector 630.

[0084] The first connector 610 is connected to and communicates with the end of the liquid pipe 300 away from the metal connector 100. The second connector 620 is connected to and communicates with the end of the suction pipe 200 away from the metal connector 100. The third connector 630 has a first flow channel 631 and a second flow channel 632 formed inside it. The third connector 630 is connected to the coaxial pipe 500 so that the first flow channel 631, the first connector 610 and the first channel 501 are connected, and the second flow channel 632, the second connector 620 and the second channel 502 are connected.

[0085] The tee connector 600 separates the liquid and gaseous refrigerant from the coaxial tube 500 into independent liquid streams 300 and suction streams 200. The first flow channel 631 and the second flow channel 632 are physically completely isolated, ensuring that the high-pressure liquid refrigerant and the low-pressure gaseous refrigerant do not mix when flowing through the tee, maintaining the purity and state of the refrigerant in their respective circuits, and effectively preventing system performance degradation caused by fluid mixing.

[0086] The 600 tee connector condenses the diversion function, which originally required multiple fittings and connectors, into a compact component, simplifying pipeline layout, reducing the number of connection points, and lowering the potential risk of leakage.

[0087] In this embodiment, the first connector 610 is plugged into the liquid tube 300, the second connector 620 is plugged into the suction tube 200, and the third connector 630 is plugged into the coaxial tube 500, and the connection is laser welded.

[0088] Laser welding technology melts the contact surface between the plastic joint and the pipeline under the action of laser energy. After cooling, it forms a molecular-level fusion, thereby achieving material homogeneity and seamless connection at the joint. It not only has high mechanical strength and can withstand the vibration and internal force of the pipeline, but also forms a static seal, further avoiding the risk of refrigerant leakage at the connection point, and achieving a permanent connection with strength close to that of the original material.

[0089] Furthermore, since both the tee connector 600 and the various pipes are made of plastic, their coefficients of thermal expansion are similar. After the tee connector 600 and the various pipes are integrated by laser welding, the entire connection structure expands and contracts synergistically under temperature changes. This effectively avoids thermal stress caused by the large difference in the coefficients of thermal expansion between metal and plastic, thereby preventing poor sealing or loosening of connections and further improving the long-term reliability of the piping system in a wide temperature range.

[0090] In this embodiment, the first connector 610 is perpendicularly disposed and connected to the first flow channel 631. The second connector 620 is parallel to the axis of the second flow channel 632. The first flow channel 631 is located outside the second flow channel 632.

[0091] Specifically, the vertical arrangement of the first connector 610 and the first flow channel 631 conforms to the characteristic that liquid refrigerant generates a large impact force due to changes in flow velocity and direction when it splits or merges, which helps to guide the fluid more smoothly and reduce local flow resistance and turbulence.

[0092] The second connector 620 and the second flow channel 632 are set to be parallel, which takes into account the characteristics of gaseous media that have good fluidity but are sensitive to pressure changes. This keeps the flow channel straight and unobstructed, minimizes pressure loss, and helps maintain the compressor's suction efficiency.

[0093] Furthermore, by placing the first flow channel 631 outside the second flow channel 632, the spatial hierarchy of the pipe section is fully utilized, forming a concentric layout of "outer liquid, inner gas." Compared to a side-by-side layout, this significantly reduces the overall dimensions of the tee connector 600, saving installation space. In this structure, the lower-temperature gaseous refrigerant flow channel is enclosed internally, while the higher-temperature liquid refrigerant flow channel is located on the outside. This structure utilizes the liquid pipeline as a thermal buffer layer, helping to reduce the thermal intrusion of external ambient heat into the internal low-temperature gas. Simultaneously, this structure also makes the wall thickness distribution of the tee connector more uniform and reasonable, enhancing structural strength.

[0094] Furthermore, in this embodiment, the vertical direction of the first connector 610 and the parallel direction of the second connector 620 form a standard L-shaped tee structure. This structure better fits the complex spatial orientation of the vehicle's engine compartment or chassis, allowing the liquid pipe 300 and the intake pipe 200 to be routed more reasonably and conveniently toward their respective target components (such as condensers, evaporators, and compressors), reducing unnecessary pipe bends and simplifying the assembly process of the assembly on the vehicle.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended 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 therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An air conditioning duct, characterized in that, Applications in air conditioning systems for new energy vehicles include: A metal connector (100) includes a connecting body, on which at least two flange joints with outwardly convex structures are formed, and the outer side wall of the flange joint near the connecting body and the end face of the connecting body facing the flange joint are provided with reverse teeth. A suction pipe (200) is used to transport low-pressure gaseous refrigerant. The suction pipe (200) is sleeved on the outside of one of the flange joints and spaced apart from the reverse teeth. A liquid pipe (300) is used to transport high-pressure, low-temperature liquid refrigerant. The liquid pipe (300) is sleeved on the other flange joint and spaced apart from the reverse teeth. The sealing element (400) is a ring and there are two of them. The two sealing elements (400) are respectively disposed between the flange joint and the suction pipe (200) and between the flange joint and the liquid pipe (300) by fusion welding. One end of the sealing element (400) engages with the reverse teeth, and the other end is sleeved on the outside of the liquid pipe (300) and the suction pipe (200), and the inner wall is in contact with the outer wall of the liquid pipe (300) and the suction pipe (200).

2. The air conditioning duct according to claim 1, characterized in that, The air conditioning piping also includes: The first sealing ring (110) is sleeved on the outside of the flange joint. There are two first sealing rings (110) and they are respectively disposed between the sealing element (400) and the suction pipe (200) and between the sealing element (400) and the liquid pipe (300).

3. The air conditioning duct according to claim 1, characterized in that, The air conditioning piping also includes a second sealing ring (120); The metal connector (100) has a plurality of metal connector heads on the side away from the flange joint, and the metal connector heads are provided with mounting grooves extending circumferentially. There are multiple second sealing rings (120), and each of the multiple second sealing rings (120) is disposed in a corresponding manner in the mounting groove of the multiple metal connector heads.

4. The air conditioning piping according to any one of claims 1-3, characterized in that, The air conditioning piping also includes: The coaxial tube (500) has a first channel (501) and a second channel (502) inside it. The first channel (501) is located outside the second channel (502). The first channel (501) is connected to the liquid tube (300), and the second channel (502) is connected to the suction tube (200).

5. The air conditioning duct according to claim 4, characterized in that, The coaxial tube (500) includes: The first barrier layer (510) is used to prevent refrigerant from permeating into the coaxial tube (500); The second barrier layer (520) is used to prevent refrigerants from permeating each other; The third barrier layer (530) is used to prevent refrigerant from permeating into the first barrier layer (510); The first barrier layer (510), the second barrier layer (520) and the third barrier layer (530) are coaxial and arranged sequentially from the outside to the inside. A first channel (501) is formed between the first barrier layer (510) and the second barrier layer (520), and a second channel (502) is formed between the second barrier layer (520) and the third barrier layer (530).

6. The air conditioning duct according to claim 5, characterized in that, The coaxial tube (500) also includes: A water-blocking layer is disposed outside the second barrier layer (520) and together with the inner wall of the first barrier layer (510) to form the first channel (501); An adhesive layer is disposed between the water-blocking layer and the second barrier layer (520), the adhesive layer bonding the water-blocking layer and the second barrier layer (520) together.

7. The air conditioning duct according to claim 4, characterized in that, The first channel (501) has multiple channels and is arranged circumferentially along the second channel (502).

8. The air conditioning duct according to claim 5, characterized in that, The air conditioning piping also includes a tee connector (600); The tee connector (600) has a first connector (610), a second connector (620) and a third connector (630); The first connector (610) is connected to and communicates with the end of the liquid tube (300) away from the metal connector (100); The second connector (620) is connected to and communicates with the end of the suction pipe (200) away from the metal connector (100); The third connector (630) has a first flow channel (631) and a second flow channel (632) formed therein. The third connector (630) is connected to the coaxial tube (500) so that the first flow channel (631), the first connector (610) and the first channel (501) are connected, and the second flow channel (632), the second connector (620) and the second channel (502) are connected.

9. The air conditioning duct according to claim 8, characterized in that, The first connector (610) is inserted into the liquid tube (300), the second connector (620) is inserted into the suction tube (200), and the third connector (630) is inserted into the coaxial tube (500), and the connection is laser welded.

10. The air conditioning duct according to claim 8, characterized in that, The first connector (610) is perpendicular to and connected to the first flow channel (631); The second connector (620) is parallel to the axis of the second flow channel (632); The first flow channel (631) is located outside the second flow channel (632).

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