Multi-layer plastic air conditioner pipe

Abstract

The utility model belongs to the technical field of automobile pipelines, and particularly relates to a multi-layer plastic air conditioner pipe which comprises an outer layer, a middle layer and an inner layer, an outer rubber layer is arranged between the outer layer and the middle layer, and an inner rubber layer is arranged between the middle layer and the inner layer. The inner layer material is made of a PA material with high cleanliness, so that low-permeability compatibility of the inner layer material with a refrigerant and compatibility tolerance of the inner layer material with a compressor lubricant can be effectively guaranteed, and meanwhile, the inner layer material has good chemical corrosion resistance, wear resistance and weather resistance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile pipeline, specifically relates to a multilayer plastic air conditioner pipe. BACKGROUND

[0002] The quality of the automobile air conditioner pipe is directly related to the reliability and safety of the automobile air conditioning system. Once the air conditioner pipe leaks, not only will the air conditioning system fail, but also it may affect the vehicle environment and passenger safety. For example, refrigerant leakage may cause chemical reaction with other parts in the vehicle, or cause safety hazards in high temperature environment. SUMMARY

[0003] In view of the above-mentioned deficiencies existing in the prior art, the utility model provides an air conditioner pipe to solve the problems of high weight, large refrigerant permeation amount, difficult assembly and the like in the prior art.

[0004] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0005] A multilayer plastic air conditioner pipe comprises an outer layer, an intermediate layer and an inner layer, an outer adhesive layer is arranged between the outer layer and the intermediate layer, and an inner adhesive layer is arranged between the intermediate layer and the inner layer.

[0006] Further, the outer layer is made of PA12 or PA612 or PA1010 or PA1012 to provide basic mechanical properties such as normal temperature and high temperature burst pressure, ensure that the product has certain mechanical strength during short-term and long-term use, and can resist different chemical substances to meet the technical requirements of the air conditioning system.

[0007] Further, a plurality of wave crests and wave troughs are arranged on the corrugated pipe.

[0008] Further, the intermediate layer is made of 50%-95% modified PP.

[0009] Further, the intermediate layer is made of 20%-80% modified PP mixed with anhydride components. PP has very good water vapor barrier performance, which can effectively prevent external water vapor from entering the pipeline to cause ice crystals in the refrigerant, affecting the cooling effect of the refrigerant.

[0010] Further, the inner layer is made of PA6 alloy or PPA alloy.

[0011] Further, the PA6 alloy or PPA alloy is 10% or more olefin copolymer.

[0012] Further, the outer and inner adhesive layers are made of a mixture of 20%-80% modified PP and anhydride components, which improves the interlayer adhesion. Conventional PA and conventional PP do not adhere to each other, and special modified materials must be used for adhesion, but the adhesion is weak. In particular, during long-term use, the use of adhesives for adhesion does not require the adjacent two layers to be special modified materials, and at the same time, the interlayer adhesion can be improved from 1 N / mm to 4 N / mm, and it has very good performance at high temperature 130 degrees Celsius and low temperature -40 degrees.

[0013] Further, the outer layer can be directly adhered to other layers.

[0014] Further, the air conditioning pipe is a straight pipe.

[0015] Further, the air conditioning pipe is a corrugated pipe.

[0016] The outer and inner adhesive layers tightly bond the outer, middle and inner layers. The adhesive layer is made of a mixture of 20%-80% modified PP and anhydride components. This material combination makes the adhesive layer have good bonding properties. Modified PP provides flexibility and chemical stability, and anhydride components enhance adhesion to ensure that the layers are not easily separated. For example, during the operation of the air conditioning system, the pipe may be affected by factors such as vibration and pressure changes, and this tight bonding structure can effectively prevent delamination between the layers and ensure the overall structural integrity of the air conditioning pipe.

[0017] The air conditioning pipe can be a straight pipe or a corrugated pipe. The straight pipe structure is simple and convenient to lay straight during installation, and is suitable for regular air conditioning system layout in space, such as some simple in-vehicle air conditioning pipe installation in buildings. The corrugated pipe has good flexibility and stretchability, and can adapt to external pressure or temperature changes that cause pipe stretching by deforming itself, reducing stress concentration caused by deformation, thereby avoiding pipe rupture, and is particularly suitable for installation environments that require bending or vibration.

[0018] The outer layer can be directly adhered to other layers, which further enhances the overall integrity of the entire pipe structure. Moreover, the outer layer is made of PA12 or PA612 or PA1010 or PA1012, which have high strength and hardness, and can provide good external protection for the pipe to prevent damage from external objects such as scratches and collisions during installation and use.

[0019] PA12, PA612, PA1010, PA1012 materials have good chemical corrosion resistance, wear resistance and weather resistance. In the air conditioning system, the pipe may contact various chemicals such as refrigerant, cleaning agent, etc., and the outer material can effectively resist the erosion of these chemicals. At the same time, its wear resistance makes the pipe not easy to be worn during installation or contact with other parts, prolonging the service life of the pipe.

[0020] The intermediate layer is made of 50%-95% modified PP or 20%-80% modified PP mixed with anhydride components. PP material has good thermal stability and toughness, and can withstand certain temperature changes and pressure. Modified PP further optimizes its performance, such as improving its compatibility with other materials, etc. When the intermediate layer contains anhydride components, it can enhance certain properties of the material, such as improving its bonding properties to different materials or improving its temperature resistance, etc., which helps to improve the performance of the entire pipe.

[0021] The inner layer uses PA6 alloy or PPA alloy, and the alloy contains 10% or more olefin copolymer. PA6 alloy and PPA alloy have good chemical resistance and mechanical properties, and can withstand long-term erosion and pressure of refrigerant. The presence of olefin copolymer can improve the flexibility and processability of the material, making the inner layer material more suitable for use inside the air conditioning pipe, ensuring the stable flow of refrigerant in the pipe, while resisting the corrosion of refrigerant.

[0022] The multi-layer structure of the air conditioning pipe has certain heat insulation performance. The outer layer and the intermediate layer can prevent external heat from entering the pipe to some extent, reducing the absorption of external heat by the refrigerant in the pipe. For air conditioning systems, this helps to improve refrigeration efficiency and reduce energy consumption. For example, in hot environments, this heat insulation structure can reduce the temperature rise of the refrigerant during pipe transmission, so that the air conditioner can better play a refrigeration role in the vehicle.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The outer layer, made of long-chain PA, effectively resists corrosion from chlorides and other chemical agents, while also exhibiting superior long-term heat resistance compared to existing structures. The middle layer, using olefin-based materials, effectively prevents moisture penetration, especially in long pipe sections. The inner layer, made of high-purity PA materials (PA alloys and PPA), ensures low-permeability compatibility with refrigerants and resistance to compressor lubricants. This new structure, while maintaining existing performance, achieves a weight reduction of approximately 50% compared to existing structures, significantly improving overall vehicle cost and driving range. It also possesses excellent chemical corrosion resistance, abrasion resistance, and weather resistance. In air conditioning systems, pipes may come into contact with various chemicals, such as refrigerants and cleaning agents; the outer layer effectively resists the corrosive effects of these chemicals. Furthermore, its abrasion resistance reduces wear during installation and when in contact with other components, extending the pipe's service life. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of an embodiment of a multilayer plastic air conditioning pipe according to the present invention;

[0026] Figure 2 This is a schematic diagram of the layered structure of an embodiment of the multilayer plastic air conditioning pipe of this utility model;

[0027] Figure 3 This is a schematic diagram of the straight pipe structure in an embodiment of a multilayer plastic air conditioning pipe according to this utility model;

[0028] Figure 4 This is a schematic diagram of the corrugated tube structure in an embodiment of a multilayer plastic air conditioning pipe according to this utility model;

[0029] The reference numerals in the accompanying drawings include:

[0030] Outer layer 1, middle layer 2, inner layer 3, outer adhesive layer 4, inner adhesive layer 5. Detailed Implementation

[0031] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments:

[0032] It should be noted that the same or similar reference numerals in the accompanying drawings of the embodiments of this utility model correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0033] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between 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. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0035] Example

[0036] like Figures 1-4 As shown, a multi-layer plastic air conditioning pipe includes an outer layer 1, a middle layer 2 and an inner layer 3. An outer adhesive layer 4 is provided between the outer layer 1 and the middle layer 2, and an inner adhesive layer 5 is provided between the middle layer 2 and the inner layer 3.

[0037] The outer layer 1 is made of PA12, PA612, PA1010, or PA1012, providing basic mechanical properties such as room temperature and high temperature burst pressure, ensuring that the product has certain mechanical strength during short-term and long-term use, while being able to withstand the requirements of different chemical substances and meet the technical requirements of air conditioning systems.

[0038] The intermediate layer 2 is made of 50%-95% modified PP.

[0039] The intermediate layer 2 is made of 20%-80% modified PP mixed with anhydride component. PP has very good barrier property to water vapor, which can effectively prevent external water vapor from entering the pipeline to cause ice crystals in the pipeline refrigerant, affecting the cooling effect of the refrigerant, meeting the requirements of SAE J3143. PP has small creep, which can maintain high performance retention rate under long-term contact with cooling liquid, and has certain supporting effect on the size and performance retention rate of the overall pipeline.

[0040] The inner layer 3 is made of PA6 alloy or PPA alloy.

[0041] The PA6 alloy or PPA alloy is 10% or more olefin copolymer. Since plastic is used instead of AL and rubber, the permeability is lower than that of the current required rubber hose. PA6 uses a special modified PA6 alloy, and PPA material uses aromatic nylon alloy, such as MXD6, MXD10, PA10T alloy, etc., which can meet the requirements of SAE J3143.

[0042] The outer rubber layer 4 and the inner rubber layer 5 are made of 20%-80% modified PP mixed with anhydride component, which improves the interlayer adhesion. Conventional PA and conventional PP do not adhere, and special modified materials must be used for adhesion, and the adhesion is weak. Especially in the long-term use process, the use of adhesive for adhesion does not require the adjacent two layers to be special modified materials, and at the same time, the interlayer adhesion can be increased from 1N / mm to 4N / mm, and it has very good performance at high temperature 130 degrees Celsius and low temperature-40 degrees.

[0043] The following is the experimental method and data of the structure:

[0044]

[0045]

[0046] SAE J3143 fills the assembly with appropriate solvent

[0047] Hot water, then immediately empty to remove any surface

[0048] Material. At room temperature, the assembly is loaded with refrigerant to about 70% capacity. For convenience, the assembly and refrigerant can be cooled to the boiling point of the refrigerant

[0049] In liquid state. The loaded assembly is placed in an air oven at 70℃±2℃ for 24 hours.

[0050] The following, in order to be in liquid state. The loaded assembly is placed in an air oven at 70℃±2℃ for 24 hours.

[0051] The following, in order to be in liquid state. The loaded assembly is placed in an air oven at 70℃±2℃ for 24 hours.

[0052] Into the 70℃±2℃ air oven for 24 hours.

[0053] At the end of the aging period, cooling will reduce the component to a suitable temperature.

[0054] 6. The boiling point of the experimental refrigerant is below 6, and the liquid refrigerant is poured out at a concentration of <118 g / m² <10 g / m².

[0055] The mixture is placed into a vacuum flask for weighing, cooled below the boiling point of the refrigerant, and then the flask is connected to a suitable...

[0056] The refrigerant recovery unit recovers all refrigerant.

[0057] After the refrigerant evaporates, lower the temperature of the beaker to approximately 70°C.

[0058] Stop for 1 hour to remove condensation, then

[0059] Weigh the beaker. Measure the volume per square meter of the tube interior.

[0060] The weight of the extract is used to report the surface of the tube based on the label.

[0061] The inner diameter is called the inner diameter.

[0062] The outer adhesive layer 4 and the inner adhesive layer 5 tightly bond the outer layer 1, the middle layer 2, and the inner layer 3, respectively. The adhesive layers are made of a mixture of 20%-80% modified PP and anhydride components; this material combination gives the adhesive layers excellent bonding properties. The modified PP provides flexibility and chemical stability, while the anhydride component enhances adhesion, ensuring that the layers are not easily separated. For example, during the operation of an air conditioning system, the pipes may be affected by factors such as vibration and pressure changes; this tight bonding structure effectively prevents delamination between the layers, ensuring the overall structural integrity of the air conditioning pipes.

[0063] Air conditioning pipes can be straight or corrugated. Straight pipes have a simple structure and are easy to lay in a straight line during installation, making them suitable for air conditioning system layouts with regular space, such as simple in-vehicle air conditioning duct installations within buildings. Corrugated pipes, on the other hand, have good flexibility and extensibility, allowing them to adapt to external forces or temperature changes that cause the pipe to expand or contract. This reduces stress concentration caused by deformation, thus preventing pipe breakage, making them particularly suitable for installation environments that require bending or are subject to vibration.

[0064] The outer layer 1 can be directly bonded to other layers, which further enhances the overall integrity of the pipeline structure. Moreover, the outer layer 1 is made of PA12, PA612, PA1010, or PA1012, which have high strength and hardness, providing good external protection for the pipeline and preventing damage such as scratches and collisions from external objects during installation and use.

[0065] PA12, PA612, PA1010, PA1012 materials have good chemical corrosion resistance, wear resistance and weather resistance. In the air conditioning system, the pipe may be in contact with various chemicals such as refrigerant, cleaning agent, etc., and the outer layer 1 material can effectively resist the erosion of these chemicals. At the same time, its wear resistance makes the pipe not easy to be worn during installation or contact with other parts, prolonging the service life of the pipe.

[0066] The intermediate layer 2 is made of 50%-95% modified PP or 20%-80% modified PP mixed with anhydride component. The PP material polypropylene has good thermal stability and toughness, and can withstand certain temperature changes and pressure. Modified PP further optimizes its performance, such as improving its compatibility with other materials, etc. When the intermediate layer contains anhydride component, it can enhance some properties of the material, such as improving its bonding properties to different materials or improving its temperature resistance, etc., which helps to improve the performance of the entire pipe.

[0067] The inner layer 3 uses PA6 alloy or PPA alloy, and the alloy contains 10% or more olefin copolymer. PA6 alloy and PPA alloy have good chemical resistance and mechanical properties, and can withstand long-term erosion and pressure of refrigerant. The presence of olefin copolymer can improve the flexibility and processability of the material, making the inner layer material more suitable for use inside the air conditioning pipe, ensuring the stable flow of refrigerant in the pipe, while resisting the corrosion of refrigerant.

[0068] The multi-layer structure of the air conditioning pipe has certain heat insulation performance. The outer layer 1 and the intermediate layer 2 can prevent external heat from entering the pipe to some extent, reducing the absorption of external heat by the refrigerant in the pipe. For air conditioning systems, this helps to improve the refrigeration efficiency and reduce energy consumption. For example, in hot environments, this heat insulation structure can reduce the temperature rise of the refrigerant during pipe transmission, so that the air conditioner can better play a refrigeration role in the vehicle.

[0069] The above-mentioned is only the embodiment of the present application, and the common knowledge of the specific structure and characteristics in the scheme is not described in detail, the ordinary skilled in the art knows all the ordinary technical knowledge in the technical field of the present application before the application date or the priority date, can know all the prior art in the field, and has the ability to apply the conventional experimental means before the date, the ordinary skilled in the art can improve and implement the present scheme under the inspiration given in the present application, and some typical known structures or known methods should not become an obstacle for the ordinary skilled in the art to implement the present application. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the present application.

Claims

1. A multi-layered plastic air conditioning tube, characterized by: It includes outer layer (1), intermediate layer (2) and inner layer (3), outer layer (1) and intermediate layer (2) are provided with outer rubber layer (4), intermediate layer (2) is provided with inner rubber layer (5) with inner layer (3), the air conditioning pipe is straight pipe or corrugated pipe, the corrugated pipe is provided with a plurality of wave crest and wave trough, the outer layer (1) is made of PA12 or PA612 or PA1010 or PA1012 material, the intermediate layer (2) is made of 50%-95% modified PP, the inner layer (3) is made of PA6 alloy or PPA alloy, the outer layer (1) can be directly bonded with other layers.

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