Multi-layer cooling pipe

Abstract

The invention 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 the polyamide component, the cooling pipe can keep good performance in the environment of a high-temperature cooling medium, cooling liquid permeation can be further reduced due to the existence of the olefin component, and the high-temperature-resistant performance of the high-temperature-resistant cooling pipe can be further improved due to the existence of the olefin component. When a cooling medium flows in the inner layer, the material can effectively resist corrosion of the cooling medium, and meanwhile ion precipitation of the cooling liquid by the pipeline can be effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile pipelines, and in particular relates to a multi-layer cooling pipe. Background Art

[0002] Early automobile cooling pipes were mostly made of metal materials, such as copper pipes or steel pipes. Metal cooling pipes have high strength and good thermal conductivity, can effectively transfer heat and withstand certain pressure. However, metal cooling pipes also have many disadvantages. They are heavy, which increases the overall load of the vehicle, which is not conducive to the fuel economy and handling performance of the vehicle. In addition, metal materials are easily corroded by coolant. After long-term use, problems such as thinning of the 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 automotive field in recent years. Plastic cooling pipes are usually made of high-temperature resistant engineering plastics, such as polyamide (PA) and polypropylene (PP). Plastic cooling pipes have the significant advantage of light weight. Compared with metal cooling pipes, they can greatly reduce the weight of the vehicle and help reduce energy consumption. At the same time, plastic materials have good corrosion resistance, can effectively resist the erosion of coolant, and improve the durability of cooling pipes. In addition, plastic cooling pipes also have the advantages of simple molding process and low cost, which are convenient for large-scale production.

[0003] However, plastic cooling pipes also face some challenges. For example, their heat resistance is still somewhat inferior to that of metal pipes. Long-term use in high-temperature environments may cause softening and deformation, affecting the normal operation of the cooling system. Summary of the invention

[0004] In view of the above-mentioned deficiencies existing in the prior art, the present invention provides a cooling tube to solve the problems of the prior art such as the penetration of coolant and the influence of the precipitation of plastic materials on the coolant.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A multi-layer cooling pipe comprises an outer jacket and a pipe body, wherein the outer jacket is installed at both ends of the pipe body, the pipe body comprises an outer layer and an inner layer, the outer jacket is arranged on the outer surface of the outer layer, a rubber layer is arranged between the outer layer and the inner layer, and the outer layer wraps the inner layer through the rubber layer.

[0007] Furthermore, the tube body is a straight tube.

[0008] Furthermore, the tube body is a corrugated tube.

[0009] Furthermore, the outer sheath is made of thermoplastic elastomer TPC material or PA6 alloy material, which can increase the short-term and long-term pull-out force between the pipeline and the counterpart, and at the same time increase the short-term and long-term pipeline bursting pressure between the pipeline and the counterpart.

[0010] Furthermore, the outer layer is made of long-chain polyamide or bio-based polyamide material, which provides 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, while being able to withstand the requirements of different chemical substances and meet the technical requirements of the water cooling system.

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

[0012] Furthermore, the adhesive layer is made of a mixture material of 20%-80% modified PP and anhydride components. The mixture material of PP and anhydride components can 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 two adjacent 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.

[0013] Compared with single-layer pipes, this structure has lower water vapor barrier performance and better tolerance to ethylene glycol coolant than single-layer nylon pipes. The PP material has higher cleanliness and can ensure excellent low precipitation performance.

[0014] The outer layer wraps the inner layer through the adhesive layer, so that the layers of the pipe body are tightly bonded. The adhesive layer is made of a mixture of 20%-80% modified PP and anhydride components, which can provide good bonding properties. The modified PP material has good flexibility and chemical stability, and the anhydride component can enhance its bonding properties, so that the outer layer and the inner layer can be firmly bonded together.

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

[0016] The outer jacket is installed at both ends of the pipe body and is located on the outer surface of the outer layer, which plays a dual role of end protection and side protection for the pipe body, enhancing the structural integrity of the entire cooling pipe. For example, when the cooling pipe is impacted by external forces or in a complex installation environment, the outer jacket can prevent the outer layer of the pipe body from being scratched or damaged, thereby avoiding the stability of the rubber layer and the inner layer being affected by damage to the outer layer.

[0017] The inner layer is made of modified PP material containing anhydride components, and the PP material itself has good thermal stability and chemical stability. The presence of anhydride components may further improve its bonding performance, so that the cooling pipe can maintain good performance even in the environment of high-temperature cooling medium. 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 pipe.

[0018] The multi-layer structure helps to insulate heat. The outer layer and the outer jacket can prevent heat from being transferred from the outside to the cooling pipe to a certain extent, reduce the absorption of external heat by the cooling medium inside the cooling pipe, and thus improve the cooling efficiency. For example, in some high-temperature working environments, this multi-layer insulation structure can reduce the heat exchange between the cooling pipe and the outside environment, allowing the cooling medium to circulate at a lower temperature and better play a cooling role.

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

[0020] When the tube body is a bellows, it has better flexibility and elasticity. The structure of the bellows can buffer the deformation of the cooling tube due to temperature changes or during installation to a certain extent. For example, in some working environments with large vibrations or temperature fluctuations, the bellows can adapt to these changes through its own deformation, reducing the risk of damage to the cooling tube caused by thermal expansion and contraction or mechanical vibration.

[0021] The outer sheath is made of thermoplastic elastomer TPC material or PA6 alloy material. Thermoplastic elastomer TPC material has good elasticity and wear resistance. During the use of the cooling pipe, especially in some scenarios where it needs to be frequently moved or in contact with other objects, it can effectively resist wear and extend the service life of the cooling pipe.

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

[0023] The outer layer is made of long-chain polyamide PA12, PA612 or bio-based polyamide PA1012, PA1010, etc., which have good mechanical properties and chemical stability. Long-chain polyamide can provide higher strength, so that the outer layer can withstand a certain external force. Bio-based polyamide materials have the advantage of environmental protection, meet the requirements of sustainable development, and have more advantages in some application scenarios with high requirements for environmental friendliness.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The presence of the polyamide component in this scheme may further improve its high temperature resistance, so that the cooling pipe can maintain good performance even in a high-temperature cooling medium environment. The presence of the olefin component may further reduce the penetration of the coolant. 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 coolant by the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of a multi-layer cooling tube embodiment of the present invention;

[0027] Figure 2 It is a schematic structural diagram of a straight tube in an embodiment of a multi-layer cooling tube of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of a corrugated tube in an embodiment of a multi-layer cooling tube of the present invention;

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

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

[0031] 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:

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Example

[0036] like Figure 1-3 As shown, a multi-layer cooling pipe includes an outer jacket 1 and a pipe body 10. The outer jacket 1 is installed at both ends of the pipe body 10. The pipe body 10 includes an outer layer 2 and an inner layer 3. The outer jacket 1 is arranged on the outer surface of the outer layer 2. A rubber 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 rubber 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 pull-out force between the pipeline and the counterpart, and at the same time increase the short-term and long-term pipeline bursting pressure between the pipeline and the counterpart. This layer is used as an annular sheath when the pipeline is connected to the counterpart, and is realized through offline secondary assembly in a non-co-extrusion mode with the multi-layer pipe.

[0038] The outer layer 2 is made of long-chain polyamide or bio-based polyamide material, which provides 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, while being able to withstand the requirements of different chemical substances and meet the technical requirements of the water cooling system.

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

[0040] The adhesive layer 4 is made of a mixture of 20%-80% modified PP and anhydride components. The mixture of PP and anhydride components can improve the interlayer adhesion. Conventional PA and conventional PP are not bonded. They must be bonded with two specially modified materials, 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. This layer is used as a conventional outer layer and inner layer material connection. In this structure, if the inner layer is conventional PP, this layer of material is required for bonding.

[0041] Compared with single-layer pipes, this structure has lower water vapor barrier performance and better tolerance to ethylene glycol coolant than single-layer nylon pipes. The PP material has higher cleanliness and can ensure excellent low precipitation performance.

[0042] The experimental methods and data of this structure are as follows:

[0043] OD24mm*1.5 wall thickness corrugated pipe

[0044]

[0045]

[0046] This solution uses a two-layer or three-layer tube of PA612 / PP. The outer layer uses PA612, a material with a higher melting point and cost advantage. If the inner layer uses conventional existing PP, a special adhesive is used in the middle for bonding. If the inner layer uses special modified PP, the outer and inner layers are directly bonded to form a two-layer structure. The outer layer PA612 can withstand higher temperatures and has better cost advantages, and the inner layer PP can provide good permeability and low ion precipitation performance. At the same time, the two-layer structure has more processing advantages than the three-layer structure.

[0047] The structure in which the outer layer 2 wraps the inner layer 3 through the adhesive layer 4 makes the layers of the tube body 10 tightly bonded. The adhesive layer 4 is made of a mixture of 20%-80% modified PP and anhydride components, which can provide good bonding properties. The modified PP material has good flexibility and chemical stability, and the anhydride component can enhance its bonding properties, so that the outer layer 2 and the inner layer 3 can be firmly bonded together.

[0048] At the same time, the processing of the two layers is simpler for equipment or process, which greatly reduces costs.

[0049] The outer jacket 1 is installed at both ends of the tube body 10 and is located on the outer surface of the outer layer 2, playing a dual role of end protection and side protection for the tube body 10, thereby enhancing the structural integrity of the entire cooling pipe. For example, when the cooling pipe is impacted by external forces or in a complex installation environment, the outer jacket 1 can prevent the outer layer 2 of the tube body 10 from being scratched or damaged, thereby preventing the stability of the adhesive layer 4 and the inner layer 3 from being affected by damage to the outer layer 2.

[0050] The inner layer 3 is made of a modified PP material containing anhydride components. The PP material polypropylene itself has good thermal stability and chemical stability. The presence of anhydride components may further improve its high temperature resistance, so that the cooling pipe can maintain good performance even in the environment of high temperature cooling medium. 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 long-term effective cooling of the cooling pipe.

[0051] The multi-layer structure helps to insulate heat. The outer layer 2 and the outer jacket 1 can prevent heat from being transferred from the outside to the cooling pipe to a certain extent, reduce the absorption of external heat by the cooling medium inside the cooling pipe, and thus improve the cooling efficiency. For example, in some working environments with high temperatures, this multi-layer insulation structure can reduce the heat exchange between the cooling pipe and the external environment, allowing the cooling medium to circulate at a lower temperature and better play a cooling role.

[0052] The tube body 10 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, is easy to install, and can achieve efficient cooling in a relatively regular space. For example, in a simple cooling circuit of some large mechanical equipment, a straight cooling tube can be easily laid along the frame or pipeline of the equipment.

[0053] When the tube body 10 is a bellows, it has better flexibility and elasticity. The structure of the bellows can buffer the deformation of the cooling tube due to temperature changes or during installation to a certain extent. For example, in some working environments with large vibrations or temperature fluctuations, the bellows can adapt to these changes through its own deformation, reducing the risk of damage to the cooling tube due to thermal expansion and contraction or mechanical vibration.

[0054] 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 scenarios where it needs to be frequently moved or in contact with other objects, it can effectively resist wear and extend the service life of the cooling pipe.

[0055] PA6 alloy material has high strength and toughness, and when the outer sheath 1 is made of this material, it can provide better mechanical protection for the cooling pipe. For example, in some occasions that may be subject 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.

[0056] The outer layer 2 is made of long-chain polyamide or bio-based polyamide materials, which have good mechanical properties and chemical stability. Long-chain polyamide can provide higher strength, so that the outer layer 2 can withstand a certain external force. Bio-based polyamide materials have the advantage of being environmentally friendly and meet the requirements of sustainable development. They are more advantageous in some application scenarios that require higher environmental friendliness.

[0057] 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 cooling tube, characterized in that: The invention comprises an outer sheath (1) and a tube body (10), wherein the outer sheath (1) is installed at both ends of the tube body (10), the tube 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 rubber layer (4) is arranged between the outer layer (2) and the inner layer (3), and the outer layer (2) wraps the inner layer (3) through the rubber layer (4).

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

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

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

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

6. The multi-layer cooling tube according to claim 1, characterized in that: The inner layer (3) is made of a modified PP material containing anhydride components.

7. The multi-layer cooling tube according to claim 1, characterized in that: The adhesive layer (4) is made of a mixture material of 20%-80% modified PP and anhydride components.

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