Multi-layer plastic air conditioner pipe

Abstract

The invention 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 invention belongs to the technical field of automobile pipelines, and in particular relates to a multi-layer plastic air-conditioning pipe. Background Art

[0002] The quality of automobile air conditioning pipes is directly related to the reliability and safety of automobile air conditioning systems. Once air conditioning pipes leak, not only will the air conditioning system fail, but they may also affect the interior environment and passenger safety. For example, refrigerant leakage may chemically react with other parts in the car, or cause safety hazards in high temperature environments. Summary of the invention

[0003] In view of the above-mentioned deficiencies existing in the prior art, the present invention provides an air conditioning pipe to solve the problems of high weight, large refrigerant penetration, and difficult assembly in the prior art.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A multi-layer plastic air-conditioning pipe comprises an outer layer, a middle layer and an inner layer, wherein 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.

[0006] Furthermore, the outer layer is made of PA12 or PA612 or PA1010 or PA1012, providing basic mechanical properties such as room temperature and high temperature bursting pressure, ensuring that the product has a certain mechanical strength during short-term and long-term use, and can withstand the requirements of different chemical substances and meet the technical requirements of the air-conditioning system.

[0007] Furthermore, the middle layer is made of 50%-95% modified PP.

[0008] Furthermore, the middle layer is made of a mixture of 20%-80% modified PP and anhydride components. PP has excellent barrier properties to water vapor and can effectively prevent external water vapor from entering the pipeline and causing ice crystals to form in the pipeline refrigerant, thereby affecting the cooling effect of the refrigerant.

[0009] Furthermore, the inner layer is made of PA6 alloy or PPA alloy.

[0010] Furthermore, the PA6 alloy or PPA alloy is an olefin copolymer containing 10% or more.

[0011] Furthermore, the outer rubber layer and the inner rubber layer are made of a mixture of 20%-80% modified PP and anhydride components to improve the interlayer adhesion. Conventional PA and conventional PP are not bonded, and two specially modified materials must be used to bond them, and the adhesion is weak. Especially in the long-term use process, the use of adhesives for bonding does not require the adjacent two layers to be special modified materials. At the same time, the interlayer adhesion can be increased from 1N / mm to 4N / mm. At the same time, it has very good performance at high temperatures of 130 degrees Celsius and low temperatures of -40 degrees.

[0012] Furthermore, the outer layer can be directly bonded to other layers.

[0013] Furthermore, the air conditioning pipe is a straight pipe.

[0014] Furthermore, the air conditioning pipe is a corrugated pipe.

[0015] The outer rubber layer and the inner rubber layer tightly bond the outer layer, the middle layer and the inner layer respectively. The rubber layer is made of a mixture of 20%-80% modified PP and anhydride components. This material combination gives the rubber layer good bonding properties. The modified PP provides flexibility and chemical stability, and the anhydride component enhances the bonding force, ensuring that the layers are not easily separated. For example, during the operation of the air-conditioning system, the pipeline may be affected by factors such as vibration and pressure changes, and this tight bonding structure can effectively prevent stratification between the layers and ensure the overall structural integrity of the air-conditioning pipe.

[0016] Air conditioning pipes can be straight pipes or corrugated pipes. Straight pipes have a simple structure and are easy to lay in a straight line during installation. They are suitable for air conditioning system layouts with regular space, such as some simple car air conditioning pipe installations in buildings. Corrugated pipes have good flexibility and elasticity. When the pipe is squeezed by external forces or temperature changes, it can adapt through its own deformation, reduce stress concentration caused by deformation, and thus avoid pipe rupture. It is particularly suitable for some installation environments that require bending or vibration.

[0017] The outer layer can be directly bonded to other layers, which further enhances the integrity of the entire pipeline structure. In addition, 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 pipeline, preventing the pipeline from being scratched, collided, etc. by external objects during installation and use.

[0018] PA12, PA612, PA1010, PA1012 materials have good chemical resistance, wear resistance and weather resistance. In the air conditioning system, the pipes may be exposed to various chemicals, such as refrigerants, detergents, etc. The outer material can effectively resist the erosion of these chemicals. At the same time, its wear resistance makes the pipes less likely to be worn during installation or when in contact with other components, extending the service life of the pipes.

[0019] The middle layer is made of 50%-95% modified PP or 20%-80% modified PP and anhydride component mixture. 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. When the middle layer contains anhydride components, it can enhance certain properties of the material, such as improving its bonding performance to different materials or improving its temperature resistance, which helps to improve the performance of the entire pipeline.

[0020] The inner layer is made of 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 refrigerants. The presence of olefin copolymer can improve the flexibility and processing performance of the material, making the inner layer material more suitable for use in air conditioning pipes, ensuring the stable flow of refrigerants in the pipes, and resisting the corrosion of refrigerants.

[0021] The multi-layered air conditioning pipe has a certain thermal insulation performance. The outer layer and the middle layer can prevent the external heat from entering the pipe to a certain extent, and reduce the refrigerant from absorbing the external heat in the pipe. For the air conditioning system, this helps to improve the cooling efficiency and reduce energy consumption. For example, in a hot environment, this thermal insulation structure can reduce the temperature rise of the refrigerant during the pipeline transmission process, so that the air conditioner can better play a cooling role in the car.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The outer layer material uses long-chain PA to effectively prevent chloride or other chemical corrosion, and its long-term heat resistance is better than the existing structure. The middle layer uses olefin materials to effectively prevent water vapor from penetrating, especially when the pipeline is long. The inner layer uses PA materials (PA alloys and PPA) with higher cleanliness to effectively ensure its low permeability compatibility with refrigerants and compatibility with compressor lubricants. The new structure can reduce weight by nearly 50% compared with the existing structure while ensuring the existing performance, which greatly improves the cost of the whole vehicle or the cruising range. At the same time, it has good chemical corrosion resistance, wear resistance and weather resistance. In the air-conditioning system, the pipes may come into contact with various chemicals, such as refrigerants, detergents, etc. The outer layer material can effectively resist the erosion of these chemicals. At the same time, its wear resistance makes the pipes less likely to be worn during installation or when in contact with other components, extending the service life of the pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of an embodiment of a multi-layer plastic air-conditioning pipe of the present invention;

[0025] Figure 2 A schematic diagram of the layered structure of a multi-layer plastic air-conditioning pipe embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of a straight tube structure in an embodiment of a multi-layer plastic air-conditioning tube of the present invention;

[0027] Figure 4 This is a schematic diagram of the corrugated tube structure in an embodiment of a multi-layer plastic air-conditioning tube of the present invention;

[0028] The reference numerals in the drawings of the specification include:

[0029] Outer layer 1, middle layer 2, inner layer 3, outer rubber layer 4, inner rubber layer 5. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0031] It should be noted that the same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] Example

[0035] like Figure 1-4 As shown, a multi-layer plastic air-conditioning pipe comprises an outer layer 1, a middle layer 2 and an inner layer 3, an outer rubber layer 4 is arranged between the outer layer 1 and the middle layer 2, and an inner rubber layer 5 is arranged between the middle layer 2 and the inner layer 3.

[0036] The outer layer 1 is made of PA12 or PA612 or PA1010 or PA1012, providing basic mechanical properties such as room temperature and high temperature bursting pressure, ensuring that the product has a certain mechanical strength during short-term and long-term use, and can withstand the requirements of different chemical substances and meet the technical requirements of the air-conditioning system.

[0037] The middle layer 2 is made of 50%-95% modified PP.

[0038] The middle layer 2 is made of a mixture of 20%-80% modified PP and anhydride components. PP has excellent barrier properties for water vapor and can effectively prevent external water vapor from entering the pipeline and causing ice crystals to form in the pipeline refrigerant, affecting the cooling effect of the refrigerant and meeting the SAE J3143 requirements. PP has small creep and can maintain a high performance retention rate under long-term contact with the coolant, which has a certain effect on the size and performance retention rate of the overall pipeline.

[0039] The inner layer 3 is made of PA6 alloy or PPA alloy.

[0040] PA6 alloy or PPA alloy is an olefin copolymer with 10% or more. Since plastic is used instead of AL and rubber, the permeability is lower than the currently required rubber hose. PA6 uses a special modified PA6 alloy, and PPA materials use aromatic nylon alloys, such as MXD6, MXD10, PA10T alloy, etc., which can meet the requirements of SAE J3143.

[0041] The outer rubber layer 4 and the inner rubber layer 5 are made of a mixture of 20%-80% modified PP and anhydride components to improve the interlayer adhesion. Conventional PA and conventional PP are not bonded, and two specially modified materials must be used to bond them, and the adhesion is weak. Especially in the long-term use process, the use of adhesives for bonding does not require the adjacent two layers to be special modified materials. At the same time, the interlayer adhesion can be increased from 1N / mm to 4N / mm. At the same time, it has very good performance at high temperatures of 130 degrees Celsius and low temperatures of -40 degrees.

[0042] The following are the experimental methods and data of this structure:

[0043] OD8mm*1.5-2mm wall thickness

[0044]

[0045]

[0046] to about 70% capacity. For convenience components

[0047] and the refrigerant can be cooled to the boiling point of the refrigerant

[0048] Place the loaded components in the

[0049] Place in an air oven at 70℃±2℃ for 24 hours.

[0050] At the end of the aging period, cooling reduces the components to a cold state.

[0051] below the boiling point of the refrigerant and pour the liquid refrigerant into

[0052] Weigh the vacuum flask, cool it below the boiling point of the refrigerant, and then connect the flask to an appropriate refrigeration

[0053] All refrigerants are recovered on the refrigerant recovery device.

[0054] After the refrigerant evaporates, adjust the beaker to about 70°C.

[0055] 1 hour to remove condensed water, and then weigh again

[0056] Measure the beaker. In grams per square meter of the tube interior

[0057] To report the extract surface is based on the nominal inside diameter of the tube.

[0059] The outer rubber layer 4 and the inner rubber layer 5 tightly bond the outer layer 1, the middle layer 2 and the inner layer 3 respectively. The rubber layer is made of a mixture of 20%-80% modified PP and anhydride components. This material combination gives the rubber layer good bonding properties. The modified PP provides flexibility and chemical stability, and the anhydride component enhances the bonding force, ensuring that the layers are not easily separated. For example, during the operation of the air-conditioning system, the pipeline may be affected by factors such as vibration and pressure changes, and this tight bonding structure can effectively prevent stratification between the layers and ensure the overall structural integrity of the air-conditioning pipe.

[0060] Air conditioning pipes can be straight pipes or corrugated pipes. Straight pipes have a simple structure and are easy to lay in a straight line during installation. They are suitable for air conditioning system layouts with regular space, such as some simple car air conditioning pipe installations in buildings. Corrugated pipes have good flexibility and elasticity. When the pipe is squeezed by external forces or temperature changes, it can adapt through its own deformation, reduce stress concentration caused by deformation, and thus avoid pipe rupture. It is particularly suitable for some installation environments that require bending or vibration.

[0061] The outer layer 1 can be directly bonded to other layers, which further enhances the integrity of the entire pipeline structure. In addition, the outer layer 1 is made of PA12 or PA612 or PA1010 or PA1012, which have high strength and hardness, and can provide good external protection for the pipeline, preventing the pipeline from being scratched, collided, etc. by external objects during installation and use.

[0062] PA12, PA612, PA1010, PA1012 materials have good chemical resistance, wear resistance and weather resistance. In the air conditioning system, the pipes may be exposed to various chemicals, such as refrigerants, detergents, etc. The outer layer 1 material can effectively resist the erosion of these chemicals. At the same time, its wear resistance makes the pipes less likely to be worn during installation or when in contact with other components, extending the service life of the pipes.

[0063] The middle layer 2 is made of 50%-95% modified PP or 20%-80% modified PP and anhydride component mixture. PP material polypropylene has good thermal stability and toughness, and can withstand certain temperature changes and pressures. Modified PP further optimizes its performance, such as improving its compatibility with other materials. When the middle layer contains anhydride components, it can enhance certain properties of the material, such as improving its bonding performance to different materials or improving its temperature resistance, etc., which helps to improve the performance of the entire pipeline.

[0064] The inner layer 3 is made of 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 refrigerants. The presence of olefin copolymer can improve the flexibility and processing performance of the material, making the inner layer material more suitable for use in the air conditioning pipe, ensuring the stable flow of refrigerant in the pipe, and resisting the corrosion of refrigerant.

[0065] The multi-layered air conditioning pipe has a certain thermal insulation performance. The outer layer 1 and the middle layer 2 can prevent the external heat from entering the pipe to a certain extent, and reduce the refrigerant absorbing the external heat in the pipe. For the air conditioning system, this helps to improve the cooling efficiency and reduce energy consumption. For example, in a hot environment, this thermal insulation structure can reduce the temperature rise of the refrigerant during the pipeline transmission process, so that the air conditioner can better play a cooling role in the car.

[0066] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for the ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A multi-layer plastic air conditioning pipe, characterized in that: The invention comprises an outer layer (1), an intermediate layer (2) and an inner layer (3), wherein an outer rubber layer (4) is arranged between the outer layer (1) and the intermediate layer (2), and an inner rubber layer (5) is arranged between the intermediate layer (2) and the inner layer (3).

2. A multi-layer plastic air conditioning pipe according to claim 1, characterized in that: The outer layer (1) is made of PA12 or PA612 or PA1010 or PA1012 material.

3. A multi-layer plastic air conditioning pipe according to claim 1, characterized in that: The middle layer (2) is made of 50%-95% modified PP.

4. A multi-layer plastic air conditioning pipe according to claim 1, characterized in that: The middle layer (2) is made of a mixture of 20%-80% modified PP and anhydride components.

5. The multi-layer plastic air conditioning pipe according to claim 1, characterized in that: The inner layer (3) is made of PA6 alloy or PPA alloy.

6. A multi-layer plastic air conditioning pipe according to claim 5, characterized in that: The PA6 alloy or PPA alloy is an olefin copolymer containing 10% or more of olefins.

7. The multi-layer plastic air conditioning pipe according to claim 1, characterized in that: The outer rubber layer (4) and the inner rubber layer (5) are made of a mixture of 20%-80% modified PP and anhydride components.

8. The multi-layer plastic air conditioning pipe according to claim 1, characterized in that: The outer layer (1) can be directly bonded to other layers.

9. The multi-layer plastic air conditioning pipe according to claim 1, characterized in that: The air conditioning pipe is a straight pipe.

10. The multi-layer plastic air conditioning pipe according to claim 1, characterized in that: The air conditioning pipe is a corrugated pipe.

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