Multi-layer cooling pipe

Abstract

The utility model belongs to the technical field of automobile pipelines, and particularly relates to a multi-layer cooling pipe which comprises an outer layer sheath, an outer layer and an inner layer, the outer layer sheath is arranged on the outer surface of the end of the outer layer pipeline, a glue layer is arranged between the outer layer and the inner layer, the outer layer wraps the inner layer through the glue layer, and the inner layer wraps the outer layer through the glue layer. The high-temperature-resistant cooling pipe has the advantages that the high-temperature-resistant performance of the high-temperature-resistant cooling pipe can be further improved due to the existence of a polyamide component, so that the cooling pipe can keep good performance under the environment of a high-temperature cooling medium; the existence of the olefin component may further reduce the permeation of the cooling liquid, and when the cooling medium flows in the inner layer, the material can effectively resist the corrosion of the cooling medium, and can effectively reduce the ion precipitation of the cooling liquid by the pipeline at the same time.

Description

TECHNICAL FIELD

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

[0002] Early automobile cooling pipes mostly adopt metal materials, such as copper pipes or steel pipes. Metal cooling pipes have high strength and good thermal conductivity, can effectively transfer heat and bear certain pressure. However, metal cooling pipes also have many disadvantages. The weight is relatively large, increases the overall load of the vehicle, is not conducive to the fuel economy and handling performance of the automobile. And metal materials are easily corroded by coolant, and after long-term use, problems such as thinning of pipe wall and leakage may occur, reducing the reliability and service life of the cooling system. In order to overcome the shortcomings of metal cooling pipes, plastic cooling pipes have been widely used in the field of automobiles in recent years. Plastic cooling pipes are usually made of high-temperature-resistant engineering plastics, such as polyamide (PA), polypropylene (PP) and the like. Plastic cooling pipes have the obvious advantage of light weight, which can greatly reduce the weight of the vehicle, helping to reduce energy consumption. At the same time, plastic materials have good corrosion resistance, which can effectively resist the corrosion of coolant, improving the durability of the cooling pipe. In addition, plastic cooling pipes also have the advantages of simple forming process and low cost, which are convenient for large-scale production and manufacturing.

[0003] However, plastic cooling pipes also face some challenges. For example, their heat resistance is still inferior to that of metal pipes, and they may soften and deform after long-term use in high-temperature environments, affecting the normal operation of the cooling system. INVENTION CONTENTS

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a cooling pipe to solve the problems of coolant penetration and the influence of plastic material precipitation on coolant in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A multilayer cooling pipe, comprising an outer sheath and a pipe body, the outer sheath is installed at both ends of the pipe body, the pipe body comprises an outer layer and an inner layer, the outer sheath is arranged on the outer surface of the outer layer, a glue layer is arranged between the outer layer and the inner layer, and the outer layer wraps the inner layer through the glue layer,

[0007] Further, the pipe body is a straight pipe.

[0008] Further, the pipe body is a corrugated pipe.

[0009] Further, the outer layer sheath is made of thermoplastic elastomer TPC material or PA6 alloy material, which can increase the short-term and long-term pull-out force of the pipeline and the opponent device, and also increase the short-term and long-term pipeline burst pressure of the pipeline and the opponent device.

[0010] Further, the outer layer is made of long-chain polyamide or bio-based polyamide material, which provides basic mechanical properties such as normal temperature and high temperature burst pressure, ensures that the product has certain mechanical strength during short-term and long-term use, and can withstand different chemical requirements to meet the technical requirements of the water cooling system.

[0011] Further, the inner layer is made of modified PP material containing anhydride components.

[0012] Further, the adhesive layer is made of 20%-80% modified PP and anhydride component mixture material. The PP and anhydride component mixture material can improve 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 during long-term use, adhesion with an adhesive does not require adjacent two layers to be special modified materials, and the interlayer adhesion can be increased 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] Compared with single-layer pipelines, the structure has lower water vapor barrier performance, better ethylene glycol coolant resistance than single-layer nylon pipes, higher PP material cleanliness, and better low precipitation performance.

[0014] The structure of the outer layer wrapping the inner layer makes the layers of the pipe body tightly combined. The adhesive layer is made of 20%-80% modified PP and anhydride component mixture material, which can provide good adhesion performance. The modified PP material has good flexibility and chemical stability, and the anhydride component can enhance its adhesion, so that the outer layer and the inner layer can be firmly combined together.

[0015] At the same time, the processing of two or three layers is simpler for equipment or process, which greatly reduces the cost.

[0016] The outer layer sheath is installed at both ends of the pipe body and on the outer surface of the outer layer, which plays a dual role of end protection and side protection for the pipe body, and enhances the structural integrity of the entire cooling pipe. For example, in the case of external force impact on the cooling pipe or in a complex installation environment, the outer layer sheath can prevent the outer layer of the pipe body from being scratched or damaged, thereby avoiding the impact on the stability of the adhesive layer and the inner layer due to the damage of the outer layer.

[0017] The inner layer is made of a modified PP material containing an anhydride component. The PP material itself has good thermal stability and chemical stability. The presence of the anhydride component can further improve its bonding properties, allowing the cooling tube to maintain good performance in a high-temperature cooling medium environment. When the cooling medium flows in the inner layer, this material can effectively resist the corrosion and high-temperature effects of the cooling medium, ensuring long-term effective cooling of the cooling tube.

[0018] The multi-layer structure helps to insulate heat, and the outer layer and outer sheath can to some extent prevent heat from the outside world into the cooling tube, reducing the absorption of external heat by the cooling medium inside the cooling tube, thereby improving cooling efficiency. For example, in some high-temperature working environments, this multi-layer insulation structure can reduce heat exchange between the cooling tube and the external environment, allowing the cooling medium to circulate at a lower temperature and better perform its cooling function.

[0019] The tube body can be a straight tube or a corrugated tube. When it is a straight tube, it is suitable for a simple linear cooling system layout, easy to install, and can achieve efficient cooling in a more regular space. For example, in some simple cooling circuits of large mechanical equipment, straight tube cooling tubes can be easily laid along the frame or pipeline of the equipment.

[0020] When the tube body is a corrugated tube, it has better flexibility and stretchability. The structure of the corrugated tube can to some extent buffer the deformation of the cooling tube due to temperature changes or installation process. For example, in some working environments with large vibrations or temperature fluctuations, the corrugated tube can adapt to these changes by deforming itself, reducing the risk of damage to the cooling tube due to thermal expansion and contraction or mechanical vibration.

[0021] The outer sheath is made of thermoplastic elastomer TPC material or PA6 alloy material, and the thermoplastic elastomer TPC material has good elasticity and wear resistance. During the use of the cooling tube, especially in some scenarios that require frequent movement or contact with other objects, it can effectively resist wear and tear, extending the service life of the cooling tube.

[0022] PA6 alloy material has high strength and toughness, and when the outer sheath is made of this material, it can provide better mechanical protection for the cooling tube. For example, in some situations that may be subjected to external pressure or impact, the outer sheath made of PA6 alloy material can prevent the tube body from being crushed or broken.

[0023] The outer layer is made of long-chain polyamide PA12, PA612 or bio-based polyamide PA1012, PA1010 and the like, which have good mechanical properties and chemical stability. The long-chain polyamide can provide higher strength, enabling the outer layer to withstand certain external forces. The bio-based polyamide material has the advantage of environmental protection and meets the requirements of sustainable development, and is more advantageous in some application scenarios with higher requirements for environmental friendliness.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] The presence of the polyamide component can further improve its high-temperature resistance, so that the cooling pipe can also maintain good performance in the environment of high-temperature cooling medium. The presence of the olefin component can further reduce the penetration of the cooling liquid. When the cooling medium flows in the inner layer, this material can effectively resist the corrosion of the cooling medium and effectively reduce the ion precipitation of the cooling liquid by the pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 It is a three-dimensional structure schematic diagram of the utility model a kind of multilayer cooling pipe embodiment;

[0027] Fig. 2 It is a structure schematic diagram of straight pipe in the utility model a kind of multilayer cooling pipe embodiment;

[0028] Fig. 3 It is a structure schematic diagram of corrugated pipe in the utility model a kind of multilayer cooling pipe embodiment;

[0029] The reference signs in the drawings of the specification include:

[0030] Outer sheath 1, pipe body 10, outer layer 2, inner layer 3, adhesive layer 4. DETAILED DESCRIPTION

[0031] In order for those skilled in the art to better understand the utility model, the technical solutions of the utility model are further described below in conjunction with the drawings and examples:

[0032] It should be noted that the same or similar reference signs in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary description, and cannot be understood as a limitation on the present patent, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0033] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0034] In the description of the present application, unless otherwise explicitly specified and limited, if the term "connection" and the like indicating the connection relationship between the components appears, the term should be interpreted broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that those skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0035] Embodiment

[0036] As Figs. 1-3 shown, a multi-layer cooling pipe, comprising an outer sheath 1 and a pipe body 10, the outer sheath 1 is installed at both ends of the pipe body 10, the pipe body 10 comprises an outer layer 2 and an inner layer 3, the outer sheath 1 is arranged on the outer surface of the outer layer 2, a glue layer 4 is arranged between the outer layer 2 and the inner layer 3, the outer layer 2 wraps the inner layer 3 through the glue layer 4, the pipe body 10 is a straight pipe, and the pipe body 10 is a corrugated pipe.

[0037] The outer sheath 1 is made of thermoplastic elastomer TPC material or PA6 alloy material, which can increase the short-term and long-term pulling force of the pipeline and the opponent, and also increase the short-term and long-term pipeline burst pressure of the pipeline and the opponent. This layer is used as a hoop sheath when the pipeline is connected with the opponent, and is not co-extruded with the multi-layer pipe. It is realized by offline secondary assembly.

[0038] The outer layer 2 is made of long-chain polyamide or bio-based polyamide material, which provides basic mechanical properties such as normal temperature and high temperature burst pressure, ensures that the product has certain mechanical strength during short-term and long-term use, and can withstand different chemical requirements to meet the technical requirements of the water cooling system.

[0039] The inner layer 3 is made of modified PP material containing anhydride components.

[0040] The adhesive layer 4 is made of 20%-80% modified PP and anhydride component mixture material. The PP and anhydride component mixture material can improve 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 during long-term use, adhesion with an adhesive is not required for adjacent two layers to be special modified materials, and the interlayer adhesion can be increased from 1 N / mm to 4 N / mm. At the same time, it has very good performance at high temperature 130 degrees Celsius and low temperature -40 degrees. This layer is used as a conventional outer layer and inner layer material connection. If the inner layer is conventional PP, this layer material is required for adhesion.

[0041] Compared with the single-layer pipeline, the structure has lower water vapor barrier performance, better ethylene glycol coolant resistance than single-layer nylon pipe, higher PP material cleanliness, and better low precipitation performance.

[0042] The experimental method and data of the structure are as follows:

[0043]

[0044]

[0045] The scheme adopts a two-layer or three-layer pipe of PA612 / PP. The outer layer adopts PA612 with higher melting point, cost advantage, and no technical neck. If the inner layer uses conventional existing PP, a special adhesive is used for adhesion in the middle. If the inner layer uses special modified PP, the outer layer and the inner layer are directly adhered to form a two-layer structure. The outer layer PA612 can withstand higher temperature and has better cost advantage. The inner layer PP can provide good permeability and low ion precipitation performance. At the same time, the two-layer structure has better processing advantage than the three-layer structure.

[0046] The structure of the outer layer 2 wrapping the inner layer 3 through the adhesive layer 4 makes the layers of the pipe body 10 tightly combined. The adhesive layer 4 is made of a mixture of 20%-80% modified PP and anhydride component, which can provide good adhesive properties. The modified PP material has good flexibility and chemical stability, and the anhydride component can enhance its adhesion, so that the outer layer 2 and the inner layer 3 can be firmly combined together.

[0047] At the same time, the processing of two layers is simpler for equipment or process, greatly reducing the cost.

[0048] The outer sheath 1 is installed at both ends of the pipe body 10 and on the outer surface of the outer layer 2, which plays a dual role of end protection and side protection for the pipe body 10, enhancing the structural integrity of the entire cooling pipe. For example, in the case of external force impact on the cooling pipe or in a complex installation environment, the outer sheath 1 can prevent the outer layer 2 of the pipe body 10 from being scratched or damaged, thereby avoiding the impact on the stability of the adhesive layer 4 and the inner layer 3 due to the damage of the outer layer 2.

[0049] The inner layer 3 is made of a modified PP material containing anhydride components, and the PP material itself has good thermal stability and chemical stability. The presence of anhydride components can further improve its high-temperature resistance, so that the cooling pipe can maintain good performance in a high-temperature cooling medium environment. When the cooling medium flows in the inner layer 3, this material can effectively resist the corrosion and high-temperature effects of the cooling medium, ensuring the long-term effective cooling of the cooling pipe.

[0050] The multi-layer structure helps to insulate heat, and the outer layer 2 and the outer sheath 1 can to some extent prevent heat from the outside from entering the cooling pipe, reducing the absorption of external heat by the cooling medium inside the cooling pipe, thereby improving the cooling efficiency. For example, in some high-temperature working environments, this multi-layer heat insulation structure can reduce the heat exchange between the cooling pipe and the external environment, so that the cooling medium can circulate at a lower temperature, better playing the role of cooling.

[0051] The pipe body 10 can be a straight pipe or a corrugated pipe. When it is a straight pipe, it is suitable for a simple straight-line cooling system layout, easy to install and can achieve efficient cooling in a more regular space. For example, in some simple cooling circuits of large mechanical equipment, straight pipe cooling pipes can be conveniently laid along the frame or pipeline of the equipment.

[0052] When the pipe body 10 is a corrugated pipe, it has better flexibility and stretchability. The structure of the corrugated pipe can to some extent buffer the deformation of the cooling pipe due to temperature changes or installation process. For example, in some working environments with large vibrations or temperature fluctuations, the corrugated pipe can adapt to these changes by deforming itself, reducing the risk of damage to the cooling pipe due to thermal expansion and contraction or mechanical vibration.

[0053] The outer sheath 1 is made of thermoplastic elastomer TPC material or PA6 alloy material, and the thermoplastic elastomer TPC material has good elasticity and wear resistance. During the use of the cooling pipe, especially in some scenes that need to be moved frequently or contacted with other objects, the wear resistance can be effectively resisted, and the service life of the cooling pipe is prolonged.

[0054] The PA6 alloy material has high strength and toughness, and when the outer sheath 1 is made of this material, better mechanical protection can be provided for the cooling pipe. For example, in some occasions that may be subjected to external pressure or impact, the outer sheath 1 made of PA6 alloy material can prevent the pipe body 10 from being crushed or broken.

[0055] The outer layer 2 is made of long-chain polyamide or bio-based polyamide material, which has good mechanical properties and chemical stability. The long-chain polyamide can provide high strength, so that the outer layer 2 can withstand certain external force. The bio-based polyamide material has the advantages of environmental protection and meets the requirements of sustainable development, and is more advantageous in some application scenarios with high requirements for environmental friendliness.

[0056] The above is only an embodiment of the present application, and the common knowledge of specific structures and properties in the scheme is not described in detail here. The ordinary skilled person 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 this field, and has the ability to apply conventional experimental means before that date. The ordinary skilled person in the art can improve and implement the present scheme based on their own ability under the guidance of the present application. Some typical known structures or known methods should not be an obstacle for the ordinary skilled person in the art to implement the present application. It should be noted 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. These will not affect the effect and practicality of the present application.

Claims

1. A multi-layer cooling tube, characterized by: The utility model provides a kind of pipe, including outer sheath (1) and pipe body (10), the outer sheath (1) is installed in pipe body (10) both ends, the pipe body (10) includes outer layer (2) and inner layer (3), the outer sheath (1) is located outer layer (2) outer surface, glue layer (4) is equipped between outer layer (2) and inner layer (3), and outer layer (2) is wrapped inner layer (3) by glue layer (4).

2. A multi-layer cooling tube according to claim 1, characterized in that: The pipe body (10) is a straight pipe.

3. A multi-layered cooling tube according to claim 1, wherein: The pipe body (10) is a corrugated pipe.

4. A multi-layer cooling tube according to claim 1, wherein: The outer sheath (1) is made of thermoplastic elastomer TPC material or PA6 alloy material.

5. A multi-layer cooling tube according to claim 1, wherein: The outer layer (2) is made of long-chain polyamide or bio-based polyamide material.

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