EGR cooler and engine assembly
By creating a notch at the point where the radiator extends beyond the intake mains, the problem of material fatigue caused by thermal stress in the radiator is solved, ensuring the stability of the EGR cooler and the reliability of the engine, and improving overall performance and lifespan.
Patent Information
- Application Number
- CN202520120433.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2035-01-17
AI Technical Summary
The ends of the heat pipes in the EGR cooler are subject to high thermal stress, which can lead to material fatigue and cracking, affecting system stability and engine performance.
A notch is provided where the heat pipe extends out of the motherboard intake to provide space for thermal expansion, reduce thermal stress, and prevent breakage or damage.
It improves the stability and reliability of the EGR cooler in high-temperature environments, extends the life of the heat pipes, and enhances engine performance and fuel economy.
Smart Images
Figure CN223562942U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of engine, concretely relates to an EGR cooler and engine assembly. BACKGROUND
[0002] EGR (Exhaust Gas Recirculation) is a crucial component in modern engine technology. Its core function is to reintroduce a portion of the exhaust gas emitted by the engine into the intake manifold, where it mixes with fresh air-fuel mixture before entering the combustion chamber again. The main purpose of this process is to reduce the maximum combustion temperature of the mixture in the combustion chamber, thereby effectively reducing the amount of nitrogen oxides (NOx) generated. With the increasing global awareness of environmental protection and the increasingly stringent emission regulations, the dependence of engines on EGR systems has gradually increased, and the performance requirements for EGR coolers have also been raised. The main responsibility of the EGR cooler is to cool the exhaust gas before it enters the engine, thereby further reducing the emission of nitrogen oxides and other harmful substances by lowering the temperature of the combustion chamber to meet more stringent environmental standards.
[0003] In the structural design of the EGR cooler, the heat dissipation pipe is closely connected to the intake main plate, and the end of the heat dissipation pipe extends out of the intake main plate. During the operation of the EGR cooler, when it is affected by high-temperature exhaust gas and heats up, the inner side of the intake main plate will be in contact with cooling water, thus maintaining a relatively low temperature. However, the outer side of the intake main plate will become very hot as it is not directly cooled by the cooling water. This temperature difference between the inner and outer sides results in a significant temperature gradient. Due to the structural design of the heat dissipation pipe and the intake main plate, the thermal expansion of the heat dissipation pipe is constrained, which can cause significant thermal stress. Over time, this continuous thermal stress can cause the material of the heat dissipation pipe to fatigue, eventually leading to cracking of the heat dissipation pipe and affecting the normal operation of the EGR system and the performance of the engine.
[0004] Therefore, there is an urgent need to propose an EGR cooler and engine assembly to solve the above problems. UTILITY MODEL CONTENTS
[0005] The utility model aims to at least solve the problem of large thermal stress at the end of the heat dissipation pipe. The purpose is achieved by the following technical solutions:
[0006] The utility model discloses a first aspect of an EGR cooler, comprising:
[0007] The shell comprises an outer shell and an intake main plate, the intake main plate is connected to one end of the outer shell, and the inside of the shell forms a cooling liquid flow channel;
[0008] The heat dissipation pipe is used for circulating engine exhaust, is arranged in the cooling liquid flow channel, and an intake end of the heat dissipation pipe is arranged in the intake main plate.
[0009] By using the EGR cooler in the technical scheme, when the engine exhaust passes through the heat dissipation pipe, heat exchange is performed between the cooling liquid circulating in the shell and the exhaust, so that the exhaust temperature is reduced. Since the exhaust temperature of the intake end of the heat dissipation pipe is high, and the cooling liquid circulates in the shell, the temperature of the part of the heat dissipation pipe extending out of the intake main plate is much higher than the temperature of the heat dissipation pipe. By opening the notch in the part of the heat dissipation pipe extending out of the intake main plate, when the part of the heat dissipation pipe extending out of the intake main plate is heat expanded, the space can be provided for releasing thermal stress, so that the heat dissipation pipe is effectively prevented from being broken or damaged due to heat expansion limitation, the stability and reliability of the EGR cooler in a high-temperature working environment are ensured, and the performance and service life of the EGR cooler as a whole are improved.
[0010] In addition, the EGR cooler of the utility model further has the following additional technical features:
[0011] In some embodiments of the utility model, the notch is a U-shaped notch.
[0012] In some embodiments of the utility model, the number of the notches is multiple, and the multiple notches are arranged at intervals along the circumference of the heat dissipation pipe.
[0013] In some embodiments of the utility model, the length of the notch in the axial direction of the heat dissipation pipe is 1mm-2mm.
[0014] In some embodiments of the utility model, the length of the heat dissipation pipe extending out of the intake main plate is 1mm-2mm.
[0015] In some embodiments of the utility model, one end of the shell connected with the intake main plate is provided with a liquid inlet pipe, the liquid inlet pipe is connected to the side wall of the shell, the liquid inlet pipe and the cooling liquid channel in the shell are in communication, and the liquid inlet pipe is used for introducing cooling liquid.
[0016] In some embodiments of the utility model, the inside of the shell is provided with a support plate, the edge of the support plate is connected with the inner wall of the shell, the heat dissipation pipe is arranged in the support plate, and the support plate is provided with an avoiding opening for circulating cooling liquid.
[0017] In some embodiments of the utility model, from the direction away from the intake main plate to the direction close to the intake main plate, the outer diameter of the part of the heat dissipation pipe extending out of the intake main plate gradually increases.
[0018] In some embodiments of the present application, the heat dissipation pipe and the air intake main plate are welded.
[0019] In a second aspect of the present application, an engine assembly is provided, which comprises the engine and the EGR cooler in the above embodiments, and the EGR cooler is connected between the exhaust manifold and the intake manifold of the engine. BRIEF DESCRIPTION OF DRAWINGS
[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the present application. Furthermore, the same reference numerals in the drawings indicate the same components. In the drawings:
[0021] Figure 1 A partial structure schematic view of the EGR cooler according to the embodiments of the present application is schematically shown;
[0022] Figure 2 A partial structure schematic view of the heat dissipation pipe according to the embodiments of the present application is schematically shown.
[0023] In the drawings, each reference numeral represents the following:
[0024] 100, housing; 110, liquid inlet pipe;
[0025] 200, air intake main plate;
[0026] 300, heat dissipation pipe; 310, notch. DETAILED DESCRIPTION
[0027] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.
[0028] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.
[0029] Although the terms first, second, third, and the like can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of example embodiments.
[0030] Spatially relative terms, such as "inner", "outer", "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0031] Figure 1 A partial structure schematic diagram of an EGR cooler according to an embodiment of the present application is schematically shown. Figure 2 A partial structure schematic diagram of a heat dissipation pipe according to an embodiment of the present application is schematically shown. As shown in the figure, Figure 1 and Figure 2As shown in the utility model discloses an EGR cooler, including shell and radiator pipe 300;The shell includes shell 100 and air intake mainboard 200, and air intake mainboard 200 is connected to one end of shell 100, and the inside of shell forms cooling liquid channel;Radiator pipe 300 is used for circulating engine exhaust, and radiator pipe 300 is arranged in cooling liquid flow channel, and the air intake end of radiator pipe 300 is arranged in air intake mainboard 200, and the end of radiator pipe 300 that stretches out air intake mainboard 200 is provided with notch 310.
[0032] By using the EGR cooler in the technical scheme, when the engine exhaust passes through the radiator pipe 300, heat exchange is carried out with the cooling liquid circulating in the inside of the shell, and the effect of reducing the exhaust temperature is achieved. Since the exhaust temperature of the air intake end of the radiator pipe 300 is high, and the cooling liquid circulates in the inside of the shell, the temperature of the part of the radiator pipe 300 that stretches out the air intake mainboard 200 is much higher than the temperature of the radiator pipe 300. By opening the notch 310 in the part of the radiator pipe 300 that stretches out the air intake mainboard 200, the part of the radiator pipe 300 that stretches out the air intake mainboard 200 has space to release thermal stress when thermal expansion occurs, thereby effectively avoiding the rupture or damage of the radiator pipe 300 due to the restriction of thermal expansion, ensuring the stability and reliability of the EGR cooler in a high-temperature working environment, and further improving the performance and service life of the EGR cooler as a whole.
[0033] Further, the shell further includes an air outlet mainboard connected to one end of the shell 100 away from the air intake mainboard 200, and the air outlet mainboard, the shell 100 and the air intake mainboard 200 are connected to form a cavity for circulating cooling liquid. The end of the radiator pipe 300 away from the air intake mainboard 200 is inserted into the air outlet mainboard. The air intake mainboard 200 and the air outlet mainboard support and fix the radiator pipe 300.
[0034] Further, the shell further includes an air inlet chamber and an air outlet chamber. The air inlet chamber and the air outlet chamber are connected to two ends of the shell 100 respectively, the air inlet chamber is communicated with the air intake end of the radiator pipe 300, and the air outlet chamber is communicated with the air outlet end of the radiator pipe 300. After the engine exhaust enters the air inlet chamber, it passes through the radiator pipe 300 and then passes through the air outlet chamber to be discharged.
[0035] Further, the number of the radiator pipe 300 is multiple, and the specific number of the radiator pipe 300 is set according to the use requirement and application scene, which is not limited here.
[0036] Further, as shown in the utility model discloses an EGR cooler, including shell and radiator pipe 300; Figure 1 The notch 310 is a U-shaped notch.
[0037] It can be understood that the stress concentration can be effectively reduced by setting the notch 310 as a U-shaped. In other embodiments, the notch 310 can also be set as an arc-shaped, semicircular or straight line-shaped, etc., as long as it can provide the necessary space for the material to expand when heated. Preferably, the corner of the opening of the notch 310 can be set as a rounded corner, which can also reduce the stress concentration and improve the stability and durability of the structure.
[0038] Further, the number of notches 310 is multiple, and the multiple notches 310 are arranged at intervals along the circumference of the heat dissipation pipe 300.
[0039] Exemplarily, the number of notches 310 can be two, three or four, etc., which is set according to the use requirement. It can be understood that too few notches 310 will be difficult to eliminate the thermal stress, and too many notches 310 will easily affect the structural strength of the heat dissipation pipe 300 or the connection strength of the heat dissipation pipe 300 and the air intake main plate 200. Alternatively, the multiple notches 310 are distributed at equal intervals along the circumference of the heat dissipation pipe 300. By distributing the multiple heat dissipation pipes 300 at equal intervals, the stress of the heat dissipation pipe 300 can be uniform, effectively avoiding the problem of local deformation of the heat dissipation pipe 300.
[0040] Further, the length of the notch 310 in the axial direction of the heat dissipation pipe 300 is 1mm-2mm.
[0041] The length of the notch 310 in the axial direction of the heat dissipation pipe 300 can be set according to the distance from the port of the heat dissipation pipe 300 to the air intake main plate 200. Exemplarily, the length of the notch 310 in the axial direction of the heat dissipation pipe 300 can be 1mm, 1.2mm, 1.5mm, 1.8mm or 2mm, etc., which is set according to the use requirement. In some embodiments, the position of the notch 310 away from the opening can be flush with the air intake main plate 200.
[0042] Further, the length of the heat dissipation pipe 300 extending out of the air intake main plate 200 is 1mm-2mm.
[0043] Since the heat dissipation pipe 300 and the air intake main plate 200 are connected in a plug-in manner, by making the heat dissipation pipe 300 extend out of the air intake main plate 200, the sealing of the connection between the heat dissipation pipe 300 and the air intake main plate 200 can be effectively guaranteed. Moreover, this length can easily meet the requirement of the gap for brazing, so that the heat dissipation pipe 300 is more easily connected to the air intake main plate 200.
[0044] Further, one end of the housing 100 connected to the air intake main plate 200 is provided with a liquid inlet pipe 110, the liquid inlet pipe 110 is connected to the side wall of the housing 100, the liquid inlet pipe 110 and the cooling liquid channel inside the housing are in communication, and the liquid inlet pipe 110 is used to introduce cooling liquid.
[0045] The cooling liquid enters the inside of the shell 100 from the liquid inlet pipe 110, exchanges heat with the heat dissipation pipes 300 in the inside of the shell 100, and cools the engine exhaust. Further, the shell 100 is connected with a water outlet pipe, the water outlet pipe is communicated with the inside of the shell 100, and the cooling liquid after exchanging heat with the heat dissipation pipes 300 flows out from the water outlet pipe. Optionally, the water outlet pipe is arranged at the end of the shell 100 far from the liquid inlet pipe 110, so as to ensure that the cooling liquid can fully exchange heat with the heat dissipation pipes 300.
[0046] Further, the inside of the shell 100 is provided with a support plate, the edge of the support plate is connected with the inside of the shell 100, the heat dissipation pipes 300 are arranged in the support plate, and the support plate is provided with a bypass opening for the cooling liquid.
[0047] It can be understood that the support plate can well support the heat dissipation pipes 300, and prevent the heat dissipation pipes 300 from being bent and deformed after long-term use. On the other hand, the heat of the heat dissipation pipes 300 can be transmitted to the support plate, so as to promote the rapid reduction of the heat of the engine exhaust. Optionally, the heat dissipation pipes 300 and the support plate can be fixedly connected by welding. Optionally, the edge of the support plate can be connected with the shell 100 by welding. Optionally, the bypass opening can be circular, oval or waist-shaped.
[0048] Optionally, the inside of the shell 100 is provided with a baffle, the baffle is connected with the inner wall of the shell 100, and the heat dissipation pipes are arranged in the baffle.
[0049] In one embodiment, the baffle is a spiral baffle. The spiral baffle forms a spiral channel in the inside of the shell 100, the cooling liquid flows through the inside of the shell 100 through the spiral channel, and the heat transfer effect can be enhanced, which is beneficial to the rapid cooling of the engine exhaust.
[0050] In another embodiment, the baffle is a semicircular baffle, and at least half of the heat dissipation pipes are arranged in the semicircular baffle. Optionally, two semicircular baffles are arranged, and the two baffles are respectively located at two sides of the shell 100. By arranging the semicircular baffles, on the one hand, the flow path of the cooling liquid can be increased, so as to increase the contact time of the cooling liquid and the heat dissipation pipes; on the other hand, the heat of the heat dissipation pipes can be transmitted to the baffles, which is beneficial to the rapid heat dissipation of the heat dissipation pipes.
[0051] Further, the part of the heat dissipation pipes 300 extending out of the air inlet main plate 200 gradually increases in diameter from the direction far from the air inlet main plate 200 to the direction close to the air inlet main plate 200.
[0052] By adopting the specific structural form, the plugging efficiency between the heat dissipation pipe 300 and the air inlet main plate 200 can be significantly improved, so that the two can be more conveniently connected. Such a design not only simplifies the assembly process, but also greatly reduces the time required for assembly. Therefore, it can effectively shorten the production cycle of the whole product, thereby improving production efficiency and reducing cost.
[0053] Further, the heat dissipation pipe 300 and the air inlet main plate 200 are welded.
[0054] In some cases, the connection between the heat dissipation pipe 300 and the air inlet main plate 200 can be carried out by brazing. The advantage of this connection method is that it can achieve stable connection between the heat dissipation pipe 300 and the air inlet main plate 200. The brazing technology is relatively simple, and does not need to rely on complex equipment and high professional knowledge. Therefore, it is easy to implement in the manufacturing process, and the cost is relatively low.
[0055] Further, the technical solution also provides an engine assembly, which comprises an engine and the above-mentioned EGR cooler, and the EGR cooler is connected between the exhaust manifold and the air inlet manifold of the engine.
[0056] When the engine is running, a part of the exhaust gas will be sent into the EGR cooler, and the exhaust gas and the cooling liquid exchange heat inside the EGR cooler, the temperature of the exhaust gas gradually decreases, and the temperature of the cooling liquid gradually increases. In this way, the temperature of the engine exhaust gas is reduced, thereby reducing the temperature and pressure in the combustion chamber. By reducing the temperature of the exhaust gas, the temperature and pressure in the combustion chamber are reduced, thereby reducing the generation of nitrogen oxides; in addition, since the EGR cooler can reduce the temperature of the exhaust gas, the engine needs less fuel to maintain the temperature in the combustion chamber during the combustion process, thereby reducing fuel consumption and improving the fuel economy of the engine; furthermore, by reducing the temperature of the exhaust gas through the EGR cooler, the working load of the engine under high temperature and high pressure can be reduced, the service life of the engine is prolonged, and the reliability of the engine is improved.
[0057] The engine assembly in the technical solution adopts the above-mentioned EGR cooler, and the part of the heat dissipation pipe 300 outside the air inlet main plate 200 is provided with a gap 310, thereby reducing the thermal stress of the air inlet end of the heat dissipation pipe 300, effectively preventing the air inlet end of the heat dissipation pipe 300 from being broken or damaged due to the restriction of thermal expansion, and further ensuring the working life and use performance of the engine assembly.
[0058] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims
1. An EGR cooler characterized by, The application relates to an EGR cooler. The shell comprises an outer shell (100) and an air inlet main plate (200) connected to one end of the outer shell (100), and the inside of the shell forms a cooling liquid flow channel. The heat dissipation pipe (300) is used for circulating engine exhaust gas, the heat dissipation pipe (300) penetrates the cooling liquid flow channel, and the air inlet end of the heat dissipation pipe (300) penetrates the air inlet main plate (200), and the end of the heat dissipation pipe (300) extending out of the air inlet main plate (200) is provided with a notch (310).
2. The EGR cooler of claim 1, wherein, The notch (310) is a U-shaped notch.
3. The EGR cooler of claim 1, wherein, The number of the notches (310) is multiple, and the multiple notches (310) are arranged at intervals along the circumference of the heat dissipation pipe (300).
4. The EGR cooler of claim 1, wherein, The length of the notch (310) in the axial direction of the heat dissipation pipe (300) is 1-2 mm.
5. The EGR cooler of claim 1, wherein, The length of the heat dissipation pipe (300) extending out of the air inlet main plate (200) is 1-2 mm.
6. The EGR cooler of any one of claims 1-5, wherein, The end of the outer shell (100) connected to the air inlet main plate (200) is provided with a liquid inlet pipe (110), the liquid inlet pipe (110) is connected to the side wall of the outer shell (100), the liquid inlet pipe (110) and the cooling liquid channel in the inside of the shell are communicated, and the liquid inlet pipe (110) is used for feeding cooling liquid.
7. The EGR cooler of any one of claims 1-5, wherein, The inside of the shell is provided with a support plate, the edge of the support plate is connected to the inner wall of the outer shell (100), the heat dissipation pipe (300) penetrates the support plate, and the support plate is provided with an avoiding opening for circulating cooling liquid.
8. The EGR cooler of any one of claims 1-5, wherein, From the direction far away from the air inlet main plate (200) to the direction close to the air inlet main plate (200), the outer diameter of the part of the heat dissipation pipe (300) extending out of the air inlet main plate (200) gradually increases.
9. The EGR cooler of any of claims 1-5, wherein, The heat dissipation pipe (300) and the air inlet main plate (200) are welded.
10. An engine assembly characterized by, The application relates to an EGR cooler. The application relates to an EGR cooler.