EGR cooler with high thermal conductivity

Abstract

The invention relates to the technical field of coolers, and particularly discloses a high-thermal-conductivity EGR cooler which comprises a cooler shell and a connecting shell. Connecting shells are fixedly arranged at the two ends of the cooler shell through bolts, the cooler shell is composed of four detachable plates, and the two sides of the four detachable plates are fixedly connected with one sides of the two connecting shells through connecting bolts. The cooling liquid frames and the waste gas frames are vertically arranged in the cooler shell in a staggered mode at intervals, the flowing directions of cooling liquid in every two adjacent cooling liquid frames are opposite, large temperature difference driving force between waste gas and the cooling liquid can be kept all the time through the unique layout mode, and the heat exchange efficiency is remarkably improved; therefore, the temperature of the recirculated waste gas is effectively reduced, the combustion efficiency of the engine is improved, and emission of nitric oxide is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of coolers, and specifically refers to an EGR cooler with high thermal conductivity. Background Art

[0002] Exhaust gas recirculation (EGR) technology, as an effective means to reduce nitrogen oxide (NOx) emissions of engines, has been widely applied in modern engine systems. An EGR cooler is a key component of the EGR system, and its main function is to reduce the temperature of the recirculated exhaust gas to improve the combustion efficiency of the engine and reduce emissions.

[0003] Traditional cooling structure designs often have difficulty achieving efficient heat exchange, resulting in poor exhaust gas cooling effects and being unable to fully meet the requirements of the engine for the temperature of the recirculated exhaust gas, thereby affecting the performance and emission indicators of the engine. Secondly, since the exhaust gas contains various impurities and particulate matters, after long-term use, the channels inside the cooler are prone to fouling and blockage, which not only reduces the cooling efficiency but also increases the maintenance cost and difficulty. Moreover, the existing cooler structures are usually relatively fixed and it is difficult to flexibly adjust the cooling parameters according to different working conditions of the engine (such as idling, high-speed driving, etc.), resulting in unsatisfactory cooling effects under certain working conditions and possible over-cooling under other working conditions, wasting energy.

[0004] Therefore, it is of great practical significance to develop an EGR cooler with high thermal conductivity, efficient cooling, self-cleaning function and easy maintenance. Summary of the Invention

[0005] In view of the above situation, to overcome the defects of the prior art, the present invention provides a high-thermal-conductivity EGR cooler to solve the above-mentioned technical defects.

[0006] To achieve the above purposes, the present invention is realized through the following technical solutions: a high-thermal-conductivity EGR cooler, including a cooler housing and connecting housings; both ends of the cooler housing are fixedly provided with connecting housings through bolts, and the cooler housing is composed of four detachable plate members, and both sides of the four detachable plate members are fixedly connected to one side of the two connecting housings through connecting bolts.

[0007] Furthermore, a number of coolant racks and a number of exhaust gas racks are movably arranged inside the cooler housing, and the number of coolant racks and exhaust gas racks are arranged vertically and alternately at intervals inside the cooler housing. The uppermost and lowermost parts inside the cooler housing are both coolant racks, and an exhaust gas rack is arranged between the two coolant racks.

[0008] Further, a splitting cavity is left inside the cooler housing. A connecting sleeve is fixedly arranged at the top of the cooler housing. An adjusting bolt is rotatably arranged inside the connecting sleeve. The surface of the adjusting bolt is threadedly connected with the inside of the connecting sleeve by precision threads, and the bottom end of the adjusting bolt extends into the cooler housing. A pressing plate is movably arranged above the inside of the cooler housing. Limiting columns are fixedly arranged around the top of the pressing plate. The top ends of the four limiting columns are slidably connected with the top of the inner wall of the cooler housing. The bottom end of the adjusting bolt is rotatably connected with the top of the pressing plate.

[0009] Further, four first guide pipes are fixedly arranged inside each of the two connecting housings. Guide pipes II are hermetically arranged on both sides of a number of coolant racks and exhaust gas racks. A number of shunt connecting pipes are fixedly arranged on one side of the guide pipes II. One ends of the number of shunt connecting pipes are hermetically connected with one ends of a number of coolant channels and exhaust gas channels respectively. A confluence connecting pipe is also fixedly arranged on the other side of the guide pipes II. One end of the confluence connecting pipe is slidably connected with one side of one of the first guide pipes. A number of adjusting connecting pipes are fixedly arranged inside the first guide pipe. One ends of the number of adjusting connecting pipes communicate with the inside of the confluence connecting pipe. The adjusting connecting pipes are flexible conduits.

[0010] Further, a coolant inlet, a coolant outlet, an exhaust gas inlet and an exhaust gas outlet are respectively fixedly arranged on one side of the four first guide pipes, and the coolant flows in opposite directions inside the adjacent two coolant racks.

[0011] Further, a number of coolant channels are arranged inside the coolant rack, and a number of exhaust gas channels are arranged inside the exhaust gas rack. Sealing connection holes are arranged at the top and bottom of the inner wall of the exhaust gas channel. Heat exchange columns are arranged inside the upper and lower sealing connection holes. A number of the sealing connection holes are equidistantly arranged inside the exhaust gas channel. A sealing ring is arranged between the surface of the heat exchange column and the inside of the sealing connection hole. One ends of the upper and lower sealing connection holes respectively extend into the coolant racks above and below, and the inside of the upper and lower sealing connection holes respectively communicate with the coolant channels inside the two coolant racks. One ends of the upper and lower heat exchange columns respectively extend into the coolant channels above and below.

[0012] Further, space variable plates are movably arranged on both sides inside the exhaust gas channel. Telescopic plates are fixedly arranged on both sides of the space variable plates. Telescopic grooves matched with the telescopic plates are arranged on both sides of the inner wall of the exhaust gas channel. The telescopic plates arranged on both sides of the space variable plate are respectively slidably connected with the inside of the telescopic grooves arranged on both sides of the inner wall of the exhaust gas channel. Miniature servo cylinders II are also fixedly arranged on both sides of the inner wall of the exhaust gas channel. The driving ends of the two miniature servo cylinders II are respectively fixedly connected with one side of the two space variable plates.

[0013] Further, a rotating head is rotatably arranged at one end of the heat exchange column located inside the exhaust gas chamber. One end of the heat exchange column is fixedly provided with a micro servo motor. One end of the output shaft of the micro servo motor is fixedly connected to the inside of the rotating head. A plurality of first micro servo electric cylinders are also fixedly arranged inside the rotating head. The driving ends of the plurality of first micro servo electric cylinders are all fixedly provided with cleaning blocks. There are four first micro servo electric cylinders arranged inside the rotating head, and the four first micro servo electric cylinders are arranged at equal angles inside the rotating head. Grooves matching the cleaning blocks are arranged on the surface of the heat exchange column, and cleaning brushes are arranged on one side of each cleaning block.

[0014] Further, the material of the cooler housing is an alloy material with high thermal conductivity and corrosion resistance.

[0015] Further, the material of the heat exchange column is the same high thermal conductivity material as that of the heat exchange pin fins.

[0016] The beneficial effects achieved by the present invention with the above structure are as follows:

[0017] 1. In the EGR cooler of the present invention, the coolant racks and the exhaust gas racks are arranged vertically and staggeredly inside the cooler housing, and the flow directions of the coolant inside the adjacent two coolant racks are opposite. This unique layout method can always maintain a large temperature difference driving force between the exhaust gas and the coolant, significantly improve the heat exchange efficiency, thereby more effectively reduce the temperature of the recirculated exhaust gas, improve the combustion efficiency of the engine and reduce the nitrogen oxide emissions.

[0018] 2. Heat exchange columns are arranged in the sealing connection holes at the top and bottom of the inner wall of the exhaust gas chamber. One end of each heat exchange column extends into the coolant chambers of the upper and lower coolant racks. The heat exchange columns are made of the same high thermal conductivity material as the heat exchange pin fins, which further promotes the heat exchange between the coolant and the exhaust gas, enhances the cooling effect, and can achieve a lower exhaust gas outlet temperature under the same conditions compared with the traditional cooler.

[0019] 3. Adjustable space variable plates are arranged on both sides inside the exhaust gas chamber. Driven by the second micro servo electric cylinders, the cross-sectional area of the exhaust gas chamber can be flexibly adjusted according to different working conditions of the engine. When the engine is idling and the exhaust gas flow rate is small, the cross-sectional area of the exhaust gas chamber is reduced to increase the exhaust gas flow velocity and enhance the convective heat transfer effect; when the engine is running at high speed and the exhaust gas flow rate is large, the cross-sectional area of the exhaust gas chamber is increased to ensure the smooth passage of the exhaust gas and avoid excessive pressure loss. This self-adaptive adjustment ability enables the cooler to maintain a good cooling effect under various working conditions, improves the overall performance and fuel economy of the engine.

[0020] 4. One end of the heat exchange column located inside the exhaust gas chamber is provided with a rotating head. The micro servo cylinder I inside the rotating head drives the cleaning block to extend. In cooperation with the movement of the space variable plate, the rotating head is driven to rotate by the micro servo motor, so that the cleaning block scrapes and cleans the exhaust gas particles attached to the inner wall of the exhaust gas chamber. This self-cleaning function effectively solves the problems of internal fouling and blockage of the traditional cooler, extends the service life of the cooler, reduces the maintenance cost and downtime, and ensures the long-term stable operation of the cooler. Description of the Drawings

[0021] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0022] Figure 1 It is a schematic diagram of the structure of a high thermal conductivity EGR cooler according to an embodiment of the present invention;

[0023] Figure 2 It is a schematic diagram of the structures of the coolant housing and the pressure plate according to an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the structures of the coolant rack and the exhaust gas rack according to an embodiment of the present invention;

[0025] Figure 4 It is a schematic diagram of the internal structures of the coolant rack and the exhaust gas rack according to an embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the structures of the heat exchange column and the telescopic plate according to an embodiment of the present invention;

[0027] Figure 6 It is a schematic diagram of the internal structure of the heat exchange column according to an embodiment of the present invention;

[0028] Figure 7 It is a schematic diagram of the internal structure of the exhaust gas rack according to an embodiment of the present invention;

[0029] Figure 8 It is a schematic diagram of the structures of the second guide pipe and the first guide pipe according to an embodiment of the present invention.

[0030] In the figure, 1 is the cooler housing; 2 is the connection housing; 3 is the first material guiding pipe; 4 is the coolant inlet; 5 is the coolant outlet; 6 is the exhaust gas inlet; 7 is the exhaust gas outlet; 8 is the coolant rack; 9 is the exhaust gas rack; 10 is the second material guiding pipe; 11 is the pressure plate; 12 is the adjusting bolt; 13 is the connecting sleeve; 14 is the limiting column; 15 is the shunt connecting pipe; 16 is the confluence connecting pipe; 17 is the adjusting connecting pipe; 18 is the coolant channel; 19 is the exhaust gas channel; 20 is the heat exchange column; 21 is the sealed connection hole; 22 is the space variable plate; 23 is the telescopic plate; 24 is the rotating head; 25 is the micro servo motor; 26 is the first micro servo electric cylinder; 27 is the cleaning block; 28 is the second micro servo electric cylinder. Detailed implementation mode

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of the present invention.

[0033] Embodiment 1

[0034] Please refer to Figures 1 to 8 As shown, a high thermal conductivity EGR cooler includes: a cooler housing 1 and a connection housing 2; the material of the cooler housing 1 is an alloy material with high thermal conductivity and corrosion resistance.

[0035] Both ends of the cooler housing 1 are fixedly provided with connection housings 2 through bolts. Among them, the cooler housing 1 is composed of four detachable plate members, and both sides of the four detachable plate members are fixedly connected to one side of the two connection housings 2 through connection bolts.

[0036] Furthermore, a plurality of coolant racks 8 and a plurality of exhaust gas racks 9 are movably arranged inside the cooler housing 1, and the plurality of coolant racks 8 and exhaust gas racks 9 are arranged at intervals up and down and staggered inside the cooler housing 1. Among them, the uppermost and lowermost parts inside the cooler housing 1 are both coolant racks 8, and an exhaust gas rack 9 is arranged between the two coolant racks 8.

[0037] In order to achieve the flexible disassembly and replacement of the coolant rack 8 and the exhaust gas rack 9 inside the cooler housing 1, a disassembly cavity is left inside the cooler housing 1. A connecting sleeve 13 is fixedly arranged at the top of the cooler housing 1, and an adjusting bolt 12 is rotatably arranged inside the connecting sleeve 13. The surface of the adjusting bolt 12 is connected with the inside of the connecting sleeve 13 by a precision thread, and the bottom end of the adjusting bolt 12 extends into the inside of the cooler housing 1. A pressure plate 11 is movably arranged above the inside of the cooler housing 1, and limiting columns 14 are fixedly arranged around the top of the pressure plate 11. The top ends of the four limiting columns 14 are slidably connected with the top of the inner wall of the cooler housing 1. The bottom end of the adjusting bolt 12 is rotatably connected with the top of the pressure plate 11. By rotating the adjusting bolt 12, the pressure plate 11 is controlled to move up and down inside the cooler housing 1. When installing the coolant rack 8 and the exhaust gas rack 9, the bottom end of the adjusting bolt 12 is used to control the pressure plate 11 to move downward, and the bottom of the pressure plate 11 is used to tightly fit and limit a plurality of coolant racks 8 and exhaust gas racks 9 inside the cooler housing 1, ensuring the stability of the coolant rack 8 and the exhaust gas rack 9 inside the cooler housing 1 during operation; when replacing the coolant rack 8 and the exhaust gas rack 9, the bottom end of the adjusting bolt 12 is used to drive the pressure plate 11 to move upward, and the bottom of the pressure plate 11 is separated from the top surface of the uppermost coolant rack 8, leaving a disassembly cavity between the pressure plate 11 and the uppermost coolant rack 8. At this time, the plate member on the front of the cooler housing 1 is opened, and at the same time, the connecting housing 2 on one side is disassembled, and the disassembly cavity inside the cooler housing 1 is used to disassemble and replace the coolant rack 8 and the exhaust gas rack 9 that need to be replaced.

[0038] Furthermore, in order to further improve the cooling efficiency of the exhaust gas, four first guide pipes 3 are fixedly arranged inside each of the two connecting shells 2, and second guide pipes 10 are hermetically arranged on both sides of several coolant racks 8 and exhaust gas racks 9. A plurality of shunt connecting pipes 15 are fixedly arranged on one side of the second guide pipes 10, and one ends of the plurality of shunt connecting pipes 15 are hermetically connected to one ends of a plurality of coolant channels 18 and exhaust gas channels 19 respectively. Among them, for the second guide pipe 10 on one side of the coolant rack 8, the plurality of shunt connecting pipes 15 arranged on one side thereof are hermetically connected to one ends of the plurality of coolant channels 18 inside; for the second guide pipe 10 on one side of the exhaust gas rack 9, the plurality of shunt connecting pipes 15 arranged on one side thereof are hermetically connected to one ends of the plurality of coolant channels 18 inside; on the other side of the second guide pipe 10, a confluence connecting pipe 16 is also fixedly arranged, and one end of the confluence connecting pipe 16 is slidably connected to one side of one of the first guide pipes 3. A plurality of adjusting connecting pipes 17 are fixedly arranged inside the first guide pipe 3, and one ends of the plurality of adjusting connecting pipes 17 communicate with the inside of the confluence connecting pipe 16. Among them, the adjusting connecting pipe 17 adopts a flexible conduit. When the confluence connecting pipe 16 slides up and down inside the first guide pipe 3 for adjustment, the communication between the inside of the first guide pipe 3 and the inside of the second guide pipe 10 is always ensured through the adjusting connecting pipe 17; on one side of the four first guide pipes 3, a coolant inlet 4, a coolant outlet 5, an exhaust gas inlet 6 and an exhaust gas outlet 7 are respectively fixedly arranged, and the flow directions of the coolant in the adjacent two coolant racks 8 are opposite; specific description: from top to bottom, the flow direction of the coolant in the first coolant rack 8 is from right to left, the flow direction of the coolant in the second coolant rack 8 is from left to right, the flow direction of the coolant in the third coolant rack 8 is from right to left, and so on, so that the flow directions of the coolant in the upper and lower two coolant racks 8 of the exhaust gas rack 9 are opposite, and the second guide pipe 10 arranged on one side of each coolant rack 8 is respectively communicated with the inside of different first guide pipes 3 through the confluence connecting pipe 16, thereby realizing the reverse control of the flow directions of the coolant in the adjacent two coolant racks 8.

[0039] It should be noted that by alternately arranging the coolant racks 8 and the exhaust gas racks 9 at intervals up and down inside the cooler housing 1, and at the same time, the coolant flows in the forward and reverse directions in the coolant racks 8 alternately arranged above and below the exhaust gas rack 9, the exhaust gas inside the exhaust gas rack 9 can be cooled more efficiently; in addition, by arranging an adjustable split cavity inside the cooler housing 1, the coolant racks 8 and the exhaust gas racks 9 inside the cooler housing 1 can be flexibly split, reducing the maintenance operation difficulty of the cooler housing 1.

[0040] It should be further noted that several coolant channels 18 are provided inside the coolant rack 8, and several exhaust gas channels 19 are provided inside the exhaust gas rack 9. Sealing connection holes 21 are provided at both the top and bottom of the inner wall of the exhaust gas channel 19, and heat exchange columns 20 are provided inside both the upper and lower sealing connection holes 21. A number of sealing connection holes 21 are equidistantly distributed inside the exhaust gas channel 19, and a sealing ring is provided between the surface of the heat exchange column 20 and the inside of the sealing connection hole 21; one end of each of the upper and lower sealing connection holes 21 extends to the inside of the upper and lower coolant racks 8 respectively, and the inside of the upper and lower sealing connection holes 21 communicates with the coolant channels 18 inside the two coolant racks 8 respectively. One end of each of the upper and lower heat exchange columns 20 extends to the inside of the upper and lower coolant channels 18 respectively. Among them, the heat exchange column 20 is made of the same material as the heat exchange pin fins, and the heat exchange column 20 is used to exchange heat between the coolant inside the coolant channel 18 and the exhaust gas inside the exhaust gas channel 19.

[0041] Furthermore, in order to be able to flexibly adjust the number of cooling units and internal structure parameters according to different engine operating conditions and exhaust gas flow rates, and ensure good cooling effects under various conditions, space variable plates 22 are movably provided on both sides inside the exhaust gas channel 19, and telescopic plates 23 are fixedly provided on both sides of the space variable plates 22. Telescopic grooves matching the telescopic plates 23 are provided on both sides of the inner wall of the exhaust gas channel 19, and the telescopic plates 23 provided on both sides of the space variable plate 22 are respectively slidably connected to the inside of the telescopic grooves provided on both sides of the inner wall of the exhaust gas channel 19. Miniature servo cylinders II 28 are also fixedly provided on both sides of the inner wall of the exhaust gas channel 19, and the driving ends of the two miniature servo cylinders II 28 are respectively fixedly connected to one side of the two space variable plates 22. By controlling the driving ends of the two miniature servo cylinders II 28, the two space variable plates 22 are slid inside the exhaust gas channel 19, so as to change the structural channels inside the exhaust gas channel 19. When the engine is idling and the exhaust gas flow rate is small, the cross-sectional area of the exhaust gas channel 19 is reduced by using the two space variable plates 22 to increase the exhaust gas flow rate and enhance the convective heat transfer effect; when driving at high speed, the cross-sectional area of the exhaust gas channel 19 is increased to ensure the smooth passage of the exhaust gas and avoid excessive pressure loss.

[0042] Further, to solve the problem that the inner wall of the exhaust gas channel 19 adheres to exhaust gas particles after long-term use, resulting in a decrease in the exhaust gas heat exchange efficiency, a rotating head 24 is rotatably arranged at one end of the heat exchange column 20 located inside the exhaust gas channel 19. One end of the heat exchange column 20 is fixedly provided with a micro servo motor 25, and one end of the output shaft of the micro servo motor 25 is fixedly connected to the inside of the rotating head 24. A number of first micro servo electric cylinders 26 are also fixedly arranged inside the rotating head 24, and the driving ends of the number of first micro servo electric cylinders 26 are all fixedly provided with cleaning blocks 27. Among them, there are four first micro servo electric cylinders 26 arranged inside the rotating head 24, and the four first micro servo electric cylinders 26 are arranged at equal angles inside the rotating head 24. The surface of the heat exchange column 20 is provided with grooves matching the cleaning blocks 27, and cleaning brushes are arranged on one side of each cleaning block 27.

[0043] It should be noted that when cleaning the inside of the exhaust gas channel 19, the driving end of the first micro servo electric cylinder 26 inside the rotating head 24 controls the cleaning block 27 to extend outward, and at the same time controls the two space variable plates 22 inside the exhaust gas channel 19 to move closer to the heat exchange column 20 until one side of the cleaning block 27 contacts one side of the space variable plate 22. The output shaft of the micro servo motor 25 is used to drive the rotating head 24 to rotate, so that the cleaning block 27 scrapes off the exhaust gas particles adhering to the side surfaces of the two space variable plates 22, and finally the exhaust gas is used to carry away the scraped exhaust gas particles, realizing the self-cleaning treatment of the inside of the exhaust gas channel 19.

[0044] In summary, in the present invention, by arranging the coolant rack 8 and the exhaust gas rack 9 vertically staggered and the coolant flowing in the reverse direction inside the cooler housing 1, and cooperating with the heat exchange column 20, the heat exchange efficiency is greatly improved, the exhaust gas can be efficiently cooled, and it helps to reduce the nitrogen oxide emissions of the engine; the space variable plate 22 inside the exhaust gas channel 19 can flexibly adjust the cross-sectional area of the exhaust gas channel according to the engine working conditions under the drive of the second micro servo electric cylinder 28, ensuring good cooling effects under different working conditions; the self-cleaning structure composed of the rotating head 24 and related components at one end of the heat exchange column 20 can effectively scrape off the exhaust gas particles adhering to the inner wall of the exhaust gas channel 19, solve the problem of fouling and blockage, and extend the service life of the cooler; the detachable plate design of the cooler housing 1 and the adjustable split cavity formed by the adjusting bolts 12 and the pressing plate 11 make the maintenance and replacement operations of the coolant rack 8 and the exhaust gas rack 9 convenient, significantly reducing the maintenance difficulty and time cost.

[0045] Embodiment 2

[0046] Specifically, this embodiment also discloses a working method of a high thermal conductivity EGR cooler, including the following steps:

[0047] Step 1: The high-temperature exhaust gas discharged from the engine flows into the first guide pipe 3 inside the connection housing 2 through the exhaust gas inlet 6, passes through the adjustment connection pipe 17, the confluence connection pipe 16, and the shunt connection pipe 15, and enters the exhaust gas channel 19 inside the exhaust gas rack 9;

[0048] The coolant flows into the first guide pipe 3 inside the connection housing 2 through the coolant inlet 4, and also passes through the adjustment connection pipe 17, the confluence connection pipe 16, and the shunt connection pipe 15, and enters the coolant channel 18 inside the coolant rack 8;

[0049] Step 2: Inside the cooler housing 1, the coolant racks 8 and the exhaust gas racks 9 are arranged vertically and staggered at intervals, and the coolant flow directions inside two adjacent coolant racks 8 are opposite. From top to bottom, the coolant flow direction inside the first coolant rack 8 is from right to left, and the coolant flow direction inside the second coolant rack 8 is from left to right, and so on. Using this layout, the exhaust gas in the exhaust gas rack 9 and the coolant in the upper and lower coolant racks 8 always maintain a large temperature difference driving force, thereby improving the heat exchange efficiency;

[0050] Step 3: Heat exchange columns 20 are arranged in the sealing connection holes 21 at the top and bottom of the inner wall of the exhaust gas channel 19, and one end of each heat exchange column extends into the coolant channels 18 of the upper and lower coolant racks 8. Since the heat exchange columns 20 are made of the same high thermal conductivity material as the heat exchange pin fins, it can further promote the heat exchange between the coolant in the coolant channels 18 and the exhaust gas in the exhaust gas channel 19, enhancing the cooling effect;

[0051] Step 4: The space variable plates 22 on both sides inside the exhaust gas channel 19 can be adjusted according to the engine operating conditions. When the engine is idling and the exhaust gas flow is small, the second micro servo cylinder 28 drives the two space variable plates 22 to slide towards the middle, reducing the cross-sectional area of the exhaust gas channel 19, increasing the exhaust gas flow velocity, and enhancing the convective heat transfer effect; when the engine is running at high speed and the exhaust gas flow is large, the second micro servo cylinder 28 drives the space variable plates 22 to slide towards both sides, increasing the cross-sectional area of the exhaust gas channel 19, ensuring the smooth passage of the exhaust gas, and avoiding excessive pressure loss;

[0052] Step 5: As the usage time increases, exhaust gas particles will adhere to the inner wall of the exhaust gas channel 19, affecting the heat exchange efficiency. At this time, a self-cleaning operation is performed. The first micro servo cylinder 26 inside the rotating head 24 drives the cleaning block 27 to extend outward, and at the same time, the second micro servo cylinder 28 controls the two space variable plates 22 inside the exhaust gas channel 19 to move closer to the heat exchange columns 20 until one side of the cleaning block 27 contacts one side of the space variable plate 22; the output shaft of the micro servo motor 25 drives the rotating head 24 to rotate, so that the cleaning block 27 scrapes off the exhaust gas particles adhering to the side surfaces of the two space variable plates 22, and the scraped exhaust gas particles are then carried away by the exhaust gas, realizing the self-cleaning treatment inside the exhaust gas channel 19;

[0053] Step Six: The cooled exhaust gas passes through the shunt connection pipe 15, the confluence connection pipe 16, and the adjustment connection pipe 17 on the other side of the exhaust gas rack 9 and flows out of the cooler from the exhaust gas outlet 7;

[0054] The coolant after absorbing heat passes through the shunt connection pipe 15, the confluence connection pipe 16, and the adjustment connection pipe 17 on the other side of the coolant rack 8 and flows out of the cooler from the coolant outlet 5;

[0055] Step Seven: When maintenance or replacement of the coolant rack 8 and the exhaust gas rack 9 is required, rotate the adjustment bolt 12, and its bottom end drives the pressure plate 11 to move upward. The bottom of the pressure plate 11 is separated from the top surface of the uppermost coolant rack 8, leaving a disassembly cavity between the pressure plate 11 and the uppermost coolant rack 8. Open the plate on the front of the cooler housing 1 and disassemble the connection housing 2 on one side. Using the disassembly cavity inside the cooler housing 1, the coolant rack 8 and the exhaust gas rack 9 that need to be replaced can be disassembled and replaced. After the replacement is completed, rotate the adjustment bolt 12 in the reverse direction to make the pressure plate 11 move downward, tightly fitting and limiting several coolant racks 8 and exhaust gas racks 9 inside the cooler housing 1 to ensure their operating stability.

[0056] Meanwhile, the content not detailed in this specification belongs to the prior art well-known to those skilled in the art.

[0057] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or sequence between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0059] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high thermal conductivity EGR cooler, comprising a cooler housing (1) and a connecting housing (2); characterized in that: Both ends of the cooler shell (1) are fixedly provided with a connecting shell (2) by bolts, and the cooler shell (1) is composed of four detachable plates, and both sides of the four detachable plates are fixedly connected to one side of the two connecting shells (2) by connecting bolts; a plurality of coolant racks (8) and a plurality of exhaust gas racks (9) are movably provided inside the cooler shell (1), a connecting sleeve (13) is fixedly provided on the top of the cooler shell (1), and an adjusting bolt (12) is rotatably provided inside the connecting sleeve (13); a pressing plate (11) is movably provided above the inside of the cooler shell (1), and limiting columns (14) are fixedly provided around the top of the pressing plate (11); a plurality of coolant racks (8) and exhaust gas racks (9) are sealed with a second material guide pipe (10) on both sides, and a plurality of shunt connecting pipes (15) are fixedly provided on one side of the second material guide pipe (10).

2. The high thermal conductivity EGR cooler according to claim 1, characterized in that: A plurality of coolant racks (8) and waste gas racks (9) are arranged in an interlaced manner in the upper and lower parts of the cooler housing (1); the top and bottom parts of the cooler housing (1) are both coolant racks (8), and a waste gas rack (9) is arranged between the two coolant racks (8).

3. The high thermal conductivity EGR cooler according to claim 2, characterized in that: A split cavity is reserved inside the cooler shell (1); the surface of the adjusting bolt (12) is connected to the internal thread of the connecting sleeve (13); the bottom end of the adjusting bolt (12) extends to the inside of the cooler shell (1); the top ends of the four limiting columns (14) are all slidably connected to the top of the inner wall of the cooler shell (1), and the bottom end of the adjusting bolt (12) is rotatably connected to the top of the pressing plate (11).

4. The high thermal conductivity EGR cooler according to claim 2, characterized in that: Four material guide pipes (3) are fixedly arranged inside the two connection shells (2), and one end of a plurality of flow-dividing connecting pipes (15) is respectively sealedly connected to one end of a plurality of cooling liquid cavities (18) and an exhaust gas cavity (19); a converging connecting pipe (16) is also fixedly arranged on the other side of the material guide pipe (10), and one end of the converging connecting pipe (16) is slidably connected to one side of one of the material guide pipes (3); a plurality of regulating connecting pipes (17) are fixedly arranged inside the material guide pipe (3), and one end of the plurality of regulating connecting pipes (17) is connected to the inside of the converging connecting pipe (16), and the regulating connecting pipe (17) adopts a flexible conduit.

5. The high thermal conductivity EGR cooler according to claim 4, characterized in that: A coolant inlet (4), a coolant outlet (5), an exhaust gas inlet (6) and an exhaust gas outlet (7) are fixedly arranged on one side of the four material guide pipes, and the coolant flows in two adjacent coolant racks (8) in opposite directions.

6. The high thermal conductivity EGR cooler according to claim 2, characterized in that: The cooling liquid rack (8) is provided with a plurality of cooling liquid channels (18), the exhaust gas rack (9) is provided with a plurality of exhaust gas channels (19), the inner wall of the exhaust gas channel (19) is provided with sealing connection holes (21) at the top and bottom, and the upper and lower sealing connection holes (21) are provided with heat exchange columns (20) at the inside, and a plurality of the sealing connection holes (21) are evenly distributed inside the exhaust gas channel (19), and a sealing ring is provided between the surface of the heat exchange column (20) and the inside of the sealing connection hole (21); one end of the upper and lower sealing connection holes (21) respectively extends to the inside of the upper and lower cooling liquid racks (8), and the inside of the upper and lower sealing connection holes (21) is respectively connected to the cooling liquid channels (18) inside the two cooling liquid racks (8), and one end of the upper and lower heat exchange columns (20) respectively extends to the inside of the upper and lower cooling liquid channels (18).

7. The high thermal conductivity EGR cooler according to claim 6, characterized in that: Both sides of the exhaust gas cavity (19) are movably provided with space variable plates (22), and both sides of the space variable plates (22) are fixedly provided with telescopic plates (23). Both sides of the inner wall of the exhaust gas cavity (19) are provided with telescopic grooves that match the telescopic plates (23). The telescopic plates (23) arranged on both sides of the space variable plate (22) are respectively slidably connected with the inside of the telescopic grooves arranged on both sides of the inner wall of the exhaust gas cavity (19). Micro servo electric cylinders (28) are also fixedly provided on both sides of the inner wall of the exhaust gas cavity (19), and the driving ends of the two micro servo electric cylinders (28) are respectively fixedly connected with one side of the two space variable plates (22).

8. The high thermal conductivity EGR cooler according to claim 6, characterized in that: A rotating head (24) is rotatably provided at one end of the heat exchange column (20) located inside the exhaust gas cavity (19), a micro servo motor (25) is fixedly provided at one end of the heat exchange column (20), one end of the output shaft of the micro servo motor (25) is fixedly connected to the inside of the rotating head (24), a plurality of micro servo electric cylinders (26) are also fixedly provided inside the rotating head (24), a cleaning block (27) is fixedly provided at the driving end of each of the micro servo electric cylinders (26), four of the micro servo electric cylinders (26) are provided inside the rotating head (24), and the four micro servo electric cylinders (26) are arranged inside the rotating head (24) at equal angles, a groove matching the cleaning block (27) is provided on the surface of the heat exchange column (20), and a cleaning brush is provided on one side of each of the cleaning blocks (27).

9. The high thermal conductivity EGR cooler according to claim 1, characterized in that: The cooler housing (1) is made of an alloy material with high thermal conductivity and corrosion resistance.

10. The high thermal conductivity EGR cooler according to claim 6, characterized in that: The material of the heat exchange column (20) is the same high thermal conductivity material as the heat exchange pin fins.

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