Waste gas cooling mechanism and engine assembly

Abstract

The utility model discloses a waste gas cooling mechanism and an engine assembly, and relates to the technical field of cooling. The waste gas cooling mechanism comprises a gas inlet chamber, a first cooling core, a second cooling core and a gas outlet chamber. The gas inlet chamber is connected with the gas outlet chamber through the first cooling core and the second cooling core in sequence, the gas inlet chamber is used for inputting high-temperature waste gas into the first cooling core, the flexibility of the first cooling core is larger than that of the second cooling core, and the ventilation sectional area of the first cooling core is larger than or equal to half of the ventilation sectional area of the second cooling core. Compared with the prior art, due to the fact that the first cooling core and the second cooling core which are connected with each other are adopted in the waste gas cooling mechanism, cracking and failure can be prevented, safety and durability are achieved, gas side pressure drop can be effectively reduced, cooling efficiency is improved, energy consumption is reduced, and economic benefits are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cooling technical field, specifically, relate to a kind of waste gas cooling mechanism and engine assembly. BACKGROUND

[0002] At present, with the increasingly stringent emission regulations, EGR (exhaust gas recirculation system) cooler is applied more and more widely in engine, and the requirement of engine to EGR cooler is also higher and higher. The most common failure reason of waste gas cooling mechanism (that is, EGR cooler) is thermal stress failure, which is due to the very high intake temperature of waste gas cooling mechanism (up to 800℃), the cooling core of waste gas cooling mechanism will be expanded and deformed during use, thereby causing cracking failure of waste gas cooling mechanism. In addition, the gas side pressure drop of cooling core in the waste gas cooling mechanism is higher, which will directly affect the cooling efficiency of waste gas cooling mechanism, increase energy consumption, and the economic benefit is poor.

[0003] Therefore, it is particularly important to design and manufacture a waste gas cooling mechanism with high cooling efficiency, safety and durability, especially in engine production. SUMMARY

[0004] The utility model aims at providing a kind of waste gas cooling mechanism, can prevent cracking failure from happening, safety and durability, and can effectively reduce gas side pressure drop, improve cooling efficiency, reduce energy consumption, improve economic benefit.

[0005] Another purpose of the utility model is to provide a kind of engine assembly, can prevent cracking failure from happening, safety and durability, and can effectively reduce gas side pressure drop, improve cooling efficiency, reduce energy consumption, improve economic benefit.

[0006] The utility model is realized by the following technical solutions.

[0007] A kind of waste gas cooling mechanism, including intake chamber, first cooling core, second cooling core and outlet chamber, intake chamber is sequentially connected with outlet chamber by first cooling core and second cooling core, intake chamber is used to input high-temperature exhaust gas into first cooling core, the flexibility of first cooling core is greater than the flexibility of second cooling core, first cooling core is used to deform to release the stress generated by thermal expansion, and the air passage sectional area of first cooling core is greater than or equal to half of the air passage sectional area of second cooling core.

[0008] Optionally, the first cooling core comprises a first connecting plate and a plurality of first cooling pipes, the plurality of first cooling pipes are spaced apart and connected to the first connecting plate; the second cooling core comprises a second connecting plate and a plurality of second cooling pipes, the plurality of second cooling pipes are spaced apart and connected to the second connecting plate; the first connecting plate is connected to the second connecting plate and together encloses a transition cavity, and the first cooling pipes and the second cooling pipes are in communication with the transition cavity.

[0009] Optionally, the first connecting plate comprises a first main plate and a first surrounding frame, the first surrounding frame is arranged around the edge of the first main plate, and the first cooling pipes are connected to the first main plate; the second connecting plate comprises a second main plate and a second surrounding frame, the second surrounding frame is arranged around the edge of the second main plate, and the second cooling pipes are connected to the second main plate; the first surrounding frame is sleeved outside the second surrounding frame and connected to the second surrounding frame, and the transition cavity is arranged between the first main plate and the second main plate.

[0010] Optionally, the distance between the first main plate and the second main plate is greater than 3 mm.

[0011] Optionally, the first cooling pipes are arranged perpendicularly to the first connecting plate, the second cooling pipes are arranged perpendicularly to the second connecting plate, and the length direction of the first cooling pipes is the same as the length direction of the second cooling pipes.

[0012] Optionally, the length of the first cooling pipes is less than 70% of the length of the second cooling pipes.

[0013] Optionally, the first cooling core further comprises a first fixing plate, the plurality of first cooling pipes are connected to the first fixing plate, the first fixing plate is arranged at one end of the first cooling pipes away from the first connecting plate, and the first fixing plate is connected to the air inlet chamber; the second cooling core further comprises a second fixing plate, the plurality of second cooling pipes are connected to the second fixing plate, the second fixing plate is arranged at one end of the second cooling pipes away from the second connecting plate, and the second fixing plate is connected to the air outlet chamber; or the first cooling pipes are in a threaded shape, a corrugated shape, a circular tube shape or a dotted circular tube shape, and the second cooling pipes are in a straight pipe shape.

[0014] Optionally, the waste gas cooling mechanism further comprises a shell, the first cooling core and the second cooling core are arranged in the internal cavity of the shell, and the shell is connected to the air inlet chamber and the air outlet chamber; the shell is spaced apart and provided with an inlet and an outlet, the inlet is arranged close to the air inlet chamber, the outlet is arranged close to the air outlet chamber, the inlet is used for passing in the cooling medium, and the outlet is used for discharging the cooling medium.

[0015] Optionally, the waste gas cooling mechanism further comprises an elastic support structure, and the elastic support structure is connected between the second cooling core and the shell.

[0016] An engine assembly comprising the exhaust cooling mechanism, the exhaust cooling mechanism comprising an intake chamber, a first cooling core, a second cooling core and an outlet chamber, the intake chamber being connected with the outlet chamber through the first cooling core and the second cooling core in sequence, the intake chamber being used for inputting high-temperature exhaust gas into the first cooling core, the flexibility of the first cooling core being greater than the flexibility of the second cooling core, the first cooling core being used for deforming to release stress generated by thermal expansion, and the ventilation cross-sectional area of the first cooling core being greater than or equal to half of the ventilation cross-sectional area of the second cooling core.

[0017] The exhaust cooling mechanism and the engine assembly provided by the utility model have the following beneficial effects:

[0018] The exhaust cooling mechanism provided by the utility model, the intake chamber is connected with the outlet chamber through the first cooling core and the second cooling core in sequence, the intake chamber is used for inputting high-temperature exhaust gas into the first cooling core, the flexibility of the first cooling core is greater than the flexibility of the second cooling core, the first cooling core is used for deforming to release stress generated by thermal expansion, and the ventilation cross-sectional area of the first cooling core is greater than or equal to half of the ventilation cross-sectional area of the second cooling core. Compared with the prior art, the exhaust cooling mechanism provided by the utility model can prevent cracking failure from occurring, is safe and durable, can effectively reduce the gas side pressure drop, improve the cooling efficiency, reduce the energy consumption and improve the economic benefit because the first cooling core and the second cooling core are connected with each other.

[0019] The engine assembly provided by the utility model comprises the exhaust cooling mechanism, can prevent cracking failure from occurring, is safe and durable, can effectively reduce the gas side pressure drop, improve the cooling efficiency, reduce the energy consumption and improve the economic benefit. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation to the scope, and for the ordinary skilled person in the art, other related drawings can also be obtained according to these drawings without paying creative labor.

[0021] Figure 1 The sectional view of the exhaust cooling mechanism provided by the embodiments of the utility model;

[0022] Figure 2 The structural schematic view of the connection between the first cooling core and the second cooling core in the exhaust cooling mechanism provided by the embodiments of the utility model;

[0023] Figure 3 The sectional view of the connection between the first cooling core and the second cooling core in the exhaust cooling mechanism provided by the embodiments of the utility model;

[0024] Figure 4 For Figure 3 Exploded view of the first connecting plate and the second connecting plate.

[0025] Figure: 100 - exhaust cooling mechanism; 110 - shell; 111 - inlet; 112 - outlet; 113 - internal cavity; 120 - intake chamber; 130 - first cooling core; 131 - first connecting plate; 1311 - first main plate; 1312 - first frame; 132 - first cooling pipe; 133 - first fixed plate; 140 - second cooling core; 141 - second connecting plate; 1411 - second main plate; 1412 - second frame; 142 - second cooling pipe; 143 - second fixed plate; 150 - outlet chamber; 160 - transition cavity. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0028] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0029] In the description of the present application, it should be noted that the orientation or position relationship indicated by the terms "inner", "outer", "upper", "lower", "horizontal", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the present application is usually placed, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0030] In the description of the utility model, still need explaining, unless another explicit provision and limitation, term "arrange", "link", "install", "connect" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through intermediate medium indirectly connect, can be two elements inside the intercommunication.For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0031] The utility model provides some implementation manners, which will be described in detail below with reference to the drawings.In the case of no conflict, the features in the following examples can be combined with each other.

[0032] Please refer to Figures 1 to 4 The utility model provides a kind of engine assembly (not shown in figure), for providing kinetic energy.It can prevent the occurrence of cracking failure, safe and durable, and can effectively reduce the pressure drop on gas side, improve cooling efficiency, reduce energy consumption, improve economic benefit.

[0033] It should be noted that the engine assembly includes an exhaust cooling mechanism 100 and an engine body (not shown in figure).The exhaust cooling mechanism 100 is connected to the engine body, and the engine body is used to provide kinetic energy.The exhaust cooling mechanism 100 is used to optimize the combustion process of the engine body by reducing the temperature of the recirculated exhaust gas, thereby achieving the purposes of emission reduction, efficiency improvement and protection of the engine body.

[0034] The exhaust cooling mechanism 100 includes an outer shell 110, an intake chamber 120, a first cooling core 130, a second cooling core 140, and an exhaust chamber 150.The intake chamber 120 is connected to the exhaust chamber 150 in sequence through the first cooling core 130 and the second cooling core 140.The intake chamber 120 is used to input high-temperature exhaust gas into the first cooling core 130.The first cooling core 130 is used to preliminarily cool the high-temperature exhaust gas and input the preliminarily cooled exhaust gas into the second cooling core 140.The second cooling core 140 is used to secondarily cool the preliminarily cooled exhaust gas and input the secondarily cooled exhaust gas into the exhaust chamber 150.The exhaust chamber 150 is used to discharge the secondarily cooled exhaust gas.

[0035] Further, the first cooling core 130 and the second cooling core 140 are both arranged in the outer shell 110, and the outer shell 110 is used to shield and protect the first cooling core 130 and the second cooling core 140.The outer shell 110 is also connected to the intake chamber 120 and the exhaust chamber 150 to realize the fixation of the overall structure of the exhaust cooling mechanism 100 and ensure the structural stability.

[0036] It is worth noting that the shell 110 is spaced apart with an inlet 111 and an outlet 112, the inlet 111 is arranged close to the air inlet chamber 120, the outlet 112 is arranged close to the air outlet chamber 150, the inlet 111 is used for the cooling medium to enter, and the outlet 112 is used for the cooling medium to exit. Specifically, the shell 110 has an internal cavity 113, the first cooling core 130 and the second cooling core 140 are arranged in the internal cavity 113, during the cooling process of the waste gas cooling mechanism 100, the air inlet chamber 120 inputs the high-temperature waste gas into the first cooling core 130 and the second cooling core 140 in turn, at the same time, the cooling medium enters the internal cavity 113 from the inlet 111 to fill the internal cavity 113, that is, the cooling medium is arranged outside the first cooling core 130 and the second cooling core 140 at the same time to exchange heat with the waste gas in the first cooling core 130 and the second cooling core 140, so as to realize the cooling function of the high-temperature waste gas, and the cooled waste gas is discharged outward through the air outlet chamber 150, and the heat-exchanged and heated cooling medium is discharged from the outlet 112, so that liquid cooling of the high-temperature waste gas can be realized, the cooling effect is good, and the cooling efficiency is high. During this process, the cooling medium in the internal cavity 113 preliminarily cools the high-temperature waste gas through the first cooling core 130, and the cooling medium in the internal cavity 113 secondarily cools the waste gas after preliminary cooling through the second cooling core 140, and the cooling effect is further improved through the two cooling methods.

[0037] It should be noted that the flexibility of the first cooling core 130 is greater than that of the second cooling core 140, the first cooling core 130 can elastically deform under the action of thermal stress without being damaged, and the second cooling core 140 will have a small deformation or even no deformation under the action of thermal stress, and will also not be damaged. Specifically, the high-temperature waste gas entering the first cooling core 130 from the air inlet chamber 120 has the highest temperature, at this time the first cooling core 130 can release the stress generated by thermal expansion through its own deformation to avoid the cracking and failure of the first cooling core 130, and the temperature of the high-temperature waste gas is reduced after being cooled by the first cooling core 130, and the second cooling core 140 will not cause the cracking and failure of the second cooling core 140, which is safe and reliable. In this way, the cracking and failure of the waste gas cooling mechanism 100 can be effectively prevented, which is safe and durable.

[0038] Further, the air passage cross-sectional area of the first cooling core 130 is greater than or equal to half of the air passage cross-sectional area of the second cooling core 140, and a reasonable ratio of the air passage cross-sectional areas of the first cooling core 130 and the second cooling core 140 can effectively reduce the gas side pressure drop, improve the cooling efficiency, reduce the energy consumption, and improve the economic benefit.

[0039] The first cooling core 130 comprises a first connecting plate 131 and a plurality of first cooling pipes 132. The plurality of first cooling pipes 132 are spaced apart and connected to the first connecting plate 131, and each of the plurality of first cooling pipes 132 is used for passing exhaust gas, and the sum of the cross-sectional areas of the plurality of first cooling pipes 132 is equal to the gas passing cross-sectional area of the first cooling core 130.

[0040] The second cooling core 140 comprises a second connecting plate 141 and a plurality of second cooling pipes 142. The plurality of second cooling pipes 142 are spaced apart and connected to the second connecting plate 141, and each of the plurality of second cooling pipes 142 is used for passing exhaust gas, and the sum of the cross-sectional areas of the plurality of second cooling pipes 142 is equal to the gas passing cross-sectional area of the second cooling core 140.

[0041] Further, the first connecting plate 131 is connected to the second connecting plate 141 (the first connecting plate 131 and the second connecting plate 141 can be separately formed and then fixedly connected, or can be directly integrally formed), and together enclose a transition cavity 160, and the first cooling pipes 132 and the second cooling pipes 142 are in communication with the transition cavity 160, that is, the high-temperature exhaust gas output by the gas inlet chamber 120 passes through the first cooling pipes 132, the transition cavity and the second cooling pipes 142 in sequence to enter the gas outlet chamber 150, and in this process, the first cooling pipes 132 are used for realizing preliminary cooling of the exhaust gas, the second cooling pipes 142 are used for realizing secondary cooling of the exhaust gas, and the transition cavity 160 is used for realizing a transition function of the exhaust gas from preliminary cooling to secondary cooling.

[0042] The first connecting plate 131 comprises a first main plate 1311 and a first surrounding frame 1312, the first surrounding frame 1312 is arranged around the edge of the first main plate 1311, and the first cooling pipes 132 are connected to the first main plate 1311. The second connecting plate 141 comprises a second main plate 1411 and a second surrounding frame 1412, the second surrounding frame 1412 is arranged around the edge of the second main plate 1411, and the second cooling pipes 142 are connected to the second main plate 1411. Specifically, the first surrounding frame 1312 is sleeved outside the second surrounding frame 1412 and connected to the second surrounding frame 1412 to fix the relative positions of the first connecting plate 131 and the second connecting plate 141, prevent the first connecting plate 131 from being separated from the second connecting plate 141, and the transition cavity 160 is arranged between the first main plate 1311 and the second main plate 1411.

[0043] Further, the spacing between the first main plate 1311 and the second main plate 1411 is greater than 3 mm, and a reasonable spacing between the first main plate 1311 and the second main plate 1411 can enhance the transition effect, ensure that the exhaust gas flowing out of the first cooling pipes 132 can flow into the second cooling pipes 142 uniformly, improve the uniformity of the exhaust gas flow, and thus improve the cooling effect.

[0044] In the embodiment, the first cooling pipe 132 is arranged perpendicularly to the first connecting disc 131, the second cooling pipe 142 is arranged perpendicularly to the second connecting disc 141, the length direction of the first cooling pipe 132 is the same as that of the second cooling pipe 142, so as to facilitate installation and maintenance, and improve the uniformity and smoothness of the exhaust gas flow and the cooling effect.

[0045] Further, the length of the first cooling pipe 132 is less than 70% of the length of the second cooling pipe 142, and the reasonable ratio of the lengths of the first cooling pipe 132 and the second cooling pipe 142 can reduce the overall length as much as possible under the condition of ensuring the heat exchange performance and safety, so as to meet the requirement of the space compactness of the exhaust gas cooling mechanism 100.

[0046] In the embodiment, the first cooling pipe 132 is in a threaded shape, and the second cooling pipe 142 is in a straight pipe shape, but is not limited thereto. In other embodiments, the first cooling pipe 132 can be in a corrugated shape, a round pipe shape or a dotted round pipe shape, and the second cooling pipe 142 can also be a round pipe. The shape of the first cooling pipe 132 and the second cooling pipe 142 is not specifically limited.

[0047] Preferably, the first cooling core 130 further comprises a first fixing plate 133. The plurality of first cooling pipes 132 are connected with the first fixing plate 133, the first fixing plate 133 is arranged at one end of the first cooling pipe 132 away from the first connecting disc 131, and the first fixing plate 133 is connected with the air inlet chamber 120, so as to fix the relative position of the first cooling core 130 and the air inlet chamber 120, and prevent the first cooling core 130 from being displaced relative to the air inlet chamber 120.

[0048] Correspondingly, the second cooling core 140 further comprises a second fixing plate 143. The plurality of second cooling pipes 142 are connected with the second fixing plate 143, the second fixing plate 143 is arranged at one end of the second cooling pipe 142 away from the second connecting disc 141, and the second fixing plate 143 is connected with the air outlet chamber 150, so as to fix the relative position of the second cooling core 140 and the air outlet chamber 150, and prevent the second cooling core 140 from being displaced relative to the air outlet chamber 150.

[0049] Preferably, the waste gas cooling mechanism 100 further comprises an elastic supporting structure (not marked in the figure), which is connected between the second cooling core 140 and the shell 110 (the elastic supporting structure can be connected on the second cooling core 140 and abut against the shell 110; or connected on the inner wall of the shell 110 and abut against the second cooling core 140; or abut against both the second cooling core 140 and the shell 110), and is used for elastically deforming when the second cooling core 140 vibrates or is deformed by heat, so as to effectively support and buffer the vibration or deformation of the second cooling core 140, avoid the cracking failure, and prolong the service life and safety of the waste gas cooling mechanism 100.

[0050] The waste gas cooling mechanism 100 provided by the embodiment of the utility model, the air inlet chamber 120 is connected with the air outlet chamber 150 through the first cooling core 130 and the second cooling core 140 in turn, the air inlet chamber 120 is used for inputting the high-temperature waste gas into the first cooling core 130, the flexibility of the first cooling core 130 is greater than that of the second cooling core 140, the first cooling core 130 is used for deforming to release the stress generated by thermal expansion, and the ventilation sectional area of the first cooling core 130 is greater than or equal to half of the ventilation sectional area of the second cooling core 140. Compared with the prior art, the waste gas cooling mechanism 100 provided by the utility model can prevent the cracking failure, is safe and durable, can effectively reduce the gas side pressure drop, improve the cooling efficiency, reduce the energy consumption, and improve the economic benefit, and is safe and has good economic benefit.

[0051] The above is only the preferred embodiment of the utility model, and is not used for limiting the utility model, and the utility model can have various changes and changes for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A waste gas cooling mechanism, characterized in that, It includes an air inlet chamber, a first cooling core, a second cooling core, and an air outlet chamber. The air inlet chamber is connected to the air outlet chamber in sequence through the first cooling core and the second cooling core. The air inlet chamber is used to input high-temperature exhaust gas into the first cooling core. The first cooling core has greater flexibility than the second cooling core. The first cooling core is used to deform to release the stress generated by thermal expansion. The ventilation cross-sectional area of ​​the first cooling core is greater than or equal to half of the ventilation cross-sectional area of ​​the second cooling core.

2. The exhaust gas cooling mechanism according to claim 1, characterized in that, The first cooling core includes a first connecting plate and a plurality of first cooling pipes, the plurality of first cooling pipes being spaced apart and all connected to the first connecting plate; The second cooling core includes a second connecting plate and a plurality of second cooling pipes, the plurality of second cooling pipes being spaced apart and all connected to the second connecting plate; The first connecting plate is connected to the second connecting plate and together they form a transition cavity. Both the first cooling pipe and the second cooling pipe are connected to the transition cavity.

3. The exhaust gas cooling mechanism according to claim 2, characterized in that, The first connecting plate includes a first main board and a first frame, the first frame surrounding the edge of the first main board, and the first cooling pipe connected to the first main board; The second connecting plate includes a second main board and a second frame, the second frame surrounding the edge of the second main board, and the second cooling pipe connected to the second main board; The first frame is fitted over the second frame and connected to the second frame, and the transition cavity is disposed between the first motherboard and the second motherboard.

4. The exhaust gas cooling mechanism according to claim 3, characterized in that, The distance between the first motherboard and the second motherboard is greater than 3mm.

5. The exhaust gas cooling mechanism according to claim 2, characterized in that, The first cooling pipe is arranged perpendicular to the first connecting plate, and the second cooling pipe is arranged perpendicular to the second connecting plate. The length direction of the first cooling pipe is the same as that of the second cooling pipe.

6. The exhaust gas cooling mechanism according to claim 2, characterized in that, The length of the first cooling pipe is less than 70% of the length of the second cooling pipe.

7. The exhaust gas cooling mechanism according to claim 2, characterized in that, The first cooling core further includes a first fixing plate, and a plurality of the first cooling pipes are connected to the first fixing plate. The first fixing plate is disposed at the end of the first cooling pipe away from the first connecting plate, and the first fixing plate is connected to the air inlet chamber. The second cooling core further includes a second fixing plate, and a plurality of the second cooling pipes are connected to the second fixing plate. The second fixing plate is disposed at the end of the second cooling pipe away from the second connecting plate, and the second fixing plate is connected to the air outlet chamber. Alternatively, the first cooling pipe may be threaded, corrugated, round, or dotted round, while the second cooling pipe may be straight.

8. The exhaust gas cooling mechanism according to claim 1, characterized in that, The exhaust gas cooling mechanism also includes a housing, and the first cooling core and the second cooling core are both disposed in the internal cavity of the housing. The housing is connected to both the air inlet chamber and the air outlet chamber. The outer casing is provided with an inlet and an outlet at intervals. The inlet is located near the air inlet chamber, and the outlet is located near the air outlet chamber. The inlet is used for the introduction of cooling medium, and the outlet is used for the discharge of cooling medium.

9. The exhaust gas cooling mechanism according to claim 8, characterized in that, The exhaust gas cooling mechanism also includes an elastic support structure, which is connected between the second cooling core and the outer shell.

10. An engine assembly, characterized in that, Includes the exhaust gas cooling mechanism as described in any one of claims 1 to 9.

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