A diesel vehicle exhaust pipe waste heat extraction device

Abstract

This invention relates to a waste heat extraction device for diesel vehicle exhaust pipes. The invention includes an internal combustion engine exhaust waste heat extraction device, a first exhaust pipe, an exhaust bend, and a second exhaust pipe. The exhaust waste heat extraction device is connected to the first exhaust pipe, which is connected to the second exhaust pipe via the exhaust bend. A first heat exchanger is installed inside the first exhaust pipe via a first connecting bracket. A first liquid inlet pipe and a first steam outlet pipe, both communicating with the first heat exchanger, are respectively installed at both ends of the first exhaust pipe. A second heat exchanger is installed inside the second exhaust pipe via a second connecting bracket. A second liquid inlet pipe and a second steam outlet pipe, both communicating with the second heat exchanger, are respectively installed at both ends of the second exhaust pipe. This invention can use segmented waste heat conversion to meet different heating needs and has the advantage of high heat conversion efficiency.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, and in particular to a diesel vehicle tailpipe waste heat extraction device for engine exhaust heat exchange. Background Technology

[0002] Chinese Patent Publication No. CN207229214U discloses a waste heat extraction device for internal combustion engine exhaust gas, which converts the high-temperature exhaust gas waste heat emitted during internal combustion engine operation into high-temperature steam. This high-temperature steam can be used to steam or heat food. The heat conversion device is the core component, directly affecting the heat conversion efficiency of the internal combustion engine exhaust gas waste heat extraction device.

[0003] Chinese Patent Publication No. CN216011897U discloses a multi-layer heat exchanger with multiple heat storage layers and interlayer connecting channels to increase the heat exchange area. In this multi-layer heat exchanger, liquid flows in from the heat storage layer above, passes through the liquid channel of that heat storage layer, and then flows into the adjacent heat storage layer through the interlayer connecting channels. However, the high-temperature exhaust gas emitted by an internal combustion engine has the highest temperature at the connection point between the exhaust pipe and the engine, and the lowest temperature at the exhaust outlet. In this multi-layer heat exchanger, the liquid in the liquid channel circulates between the highest and lowest exhaust gas temperatures. When the liquid flows through the heat storage layer's liquid channel and then into the adjacent heat storage layer through the interlayer connecting channels, the liquid flows from the high-temperature zone to the low-temperature zone and then back again, resulting in heat loss and reducing the efficiency of the heat exchange. Summary of the Invention

[0004] To address the aforementioned technical problems in the background art, this invention provides a diesel vehicle tailpipe waste heat extraction device that can adopt a segmented conversion of exhaust gas waste heat to meet different heating needs and has the advantage of high heat conversion efficiency.

[0005] The technical solution of this invention is as follows: This invention is a waste heat extraction device for diesel vehicle tailpipes, characterized in that: the waste heat extraction device for diesel vehicle tailpipes includes an internal combustion engine exhaust waste heat extraction device, a first exhaust pipe, an exhaust bend, and a second exhaust pipe. The internal combustion engine exhaust waste heat extraction device is connected to the first exhaust pipe, and the first exhaust pipe is connected to the second exhaust pipe through the exhaust bend. A first heat exchanger is installed inside the first exhaust pipe, and the first heat exchanger is installed inside the first exhaust pipe through a first connecting bracket. A first liquid inlet pipe and a first steam outlet pipe, which are connected to the first heat exchanger, are respectively installed at both ends of the first exhaust pipe. A second heat exchanger is installed inside the second exhaust pipe, and the second heat exchanger is installed inside the second exhaust pipe through a second connecting bracket. A second liquid inlet pipe and a second steam outlet pipe, which are connected to the second heat exchanger, are respectively installed at both ends of the second exhaust pipe.

[0006] Furthermore, both the first and second heat exchangers are cylindrical heat exchangers. The cylindrical heat exchanger includes a heat exchange unit, which includes a heat storage layer. The heat storage layer is cylindrical, and a liquid channel is arranged around it. One end of the liquid channel is provided with a liquid inlet, and the other end is provided with a liquid outlet. There are multiple heat exchange units. In two adjacent heat exchange units, the liquid outlet of the heat storage layer of the preceding heat exchange unit is connected to the liquid inlet of the heat storage layer of the following heat exchange unit.

[0007] Furthermore, the heat storage layer consists of two layers, including a first heat storage layer and a second heat storage layer. The second heat storage layer is coaxially disposed inside the first heat storage layer. The first heat storage layer and the second heat storage layer are connected by a connecting plate. The first heat storage layer is provided with a liquid inlet hole, and the connecting plate is provided with a liquid inlet channel and a liquid outlet channel. The liquid inlet hole is connected to the liquid inlet of the second heat storage layer through the liquid inlet channel, and the liquid outlet of the second heat storage layer is connected to the liquid inlet of the first heat storage layer through the liquid outlet channel. In two adjacent heat conversion units, the liquid outlet of the first heat storage layer of the preceding heat conversion unit is connected to the liquid inlet hole of the first heat storage layer of the following heat conversion unit.

[0008] Furthermore, both the first heat exchanger and the second heat exchanger are plate heat exchangers. The plate heat exchanger includes a heat conversion unit, which includes a heat storage layer. The heat storage layer is plate-shaped and has a liquid channel inside. One end of the liquid channel has a liquid inlet and the other end has a liquid outlet. The heat storage layer is a straight plate or an arc plate.

[0009] Furthermore, when the heat storage layer is an arc-shaped panel, the heat storage layer consists of three layers: a first heat storage layer, a second heat storage layer, and a third heat storage layer. The second heat storage layer is arranged parallel to the inner side of the first heat storage layer. The first heat storage layer and the second heat storage layer are connected by a first heat exchange plate connector. A first liquid channel is provided inside the first heat exchange plate connector. The liquid outlet of the first heat storage layer is connected to the liquid inlet of the second heat storage layer through the liquid channel. The third heat storage layer is arranged parallel to the inner side of the second heat storage layer. The second heat storage layer and the third heat storage layer are connected by a second heat exchange plate connector. A second liquid channel is provided inside the second heat exchange plate connector. The liquid outlet of the second heat storage layer is connected to the liquid inlet of the third heat storage layer through the second liquid channel. There are multiple heat conversion units. In two adjacent heat conversion units, the liquid outlet of the third heat storage layer of the preceding heat conversion unit is connected to the liquid inlet of the third heat storage layer of the following heat conversion unit through a heat exchange plate connecting pipe.

[0010] Furthermore, when the heat storage layer is a straight plate type, there are multiple heat conversion units, and the liquid outlet of the heat storage layer of the preceding heat conversion unit is connected to the liquid inlet of the heat storage layer of the following heat conversion unit in two adjacent heat conversion units.

[0011] Furthermore, a third heat exchanger is installed inside the exhaust gas bend. The third heat exchanger is a plate heat exchanger with an arc panel-type heat storage layer. The third heat exchanger is installed inside the exhaust gas bend via a third connecting bracket. A third liquid inlet pipe and a third steam outlet pipe, which are connected to the third heat exchanger, are respectively installed at both ends of the exhaust gas bend.

[0012] Furthermore, the liquid channels are Z-shaped or S-shaped.

[0013] Furthermore, when the liquid channel is "Z" shaped, a groove is arranged around the heat storage layer. An upper partition shaft and a lower partition shaft are arranged in the groove. The upper end of the upper partition shaft is connected to the upper inner wall of the groove, and the lower end is separated from the lower inner wall of the groove. The lower end of the lower partition shaft is connected to the lower inner wall of the groove, and the upper end is separated from the upper inner wall of the groove. There are multiple upper and lower partition shafts arranged alternately.

[0014] Furthermore, heat storage fins are provided along the circumference on the inner and outer surfaces of the heat storage layer.

[0015] This invention provides a diesel vehicle tailpipe waste heat extraction device. An internal combustion engine exhaust waste heat extraction device is installed at the exhaust end of the internal combustion engine, where the exhaust waste heat temperature is highest. The steam converted by the exhaust waste heat extraction device can be used for steaming rice. The steam converted by the first heat exchanger in the first exhaust pipe through which the exhaust gas flows can be used for boiling water. The steam converted by the third heat exchanger in the exhaust bend pipe and the second heat exchanger in the second exhaust pipe can be used for heating.

[0016] The heat exchanger of the present invention is composed of multiple heat exchange units connected end to end. During the process of liquid flowing from the low temperature zone to the high temperature zone, sufficient heat exchange is first carried out in the low temperature zone, and then heat exchange is carried out in the high temperature zone in sequence, which reduces heat loss and improves the efficiency of heat exchange.

[0017] The plate heat exchanger provided by this invention can be processed into a straight plate type or an arc plate type, and has the advantage of small size. It can be applied to the bend connection of the exhaust pipe, so that the heat of the exhaust gas at the bend connection can also be converted into heat. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural schematic diagram of the cylindrical heat exchanger of the present invention;

[0020] Figure 3 This is a perspective sectional view of a specific embodiment of the cylindrical heat exchanger of the present invention;

[0021] Figure 4This is a three-dimensional cross-sectional view of the heat conversion unit of the cylindrical heat exchanger of the present invention;

[0022] Figure 5 This is a three-dimensional schematic diagram of the liquid channel in the heat conversion unit of the cylindrical heat exchanger of the present invention;

[0023] Figure 6 This is a schematic diagram of the liquid flow direction in the cylindrical heat exchanger of the present invention;

[0024] Figure 7 This is a schematic diagram of the heat exchange in the cylindrical heat exchanger of the present invention;

[0025] Figure 8 This is a three-dimensional structural schematic diagram of the plate heat exchanger of the present invention;

[0026] Figure 9 This is a three-dimensional cross-sectional view of the heat storage layer of the plate heat exchanger of the present invention, which is an arc-shaped panel.

[0027] Figure 10 This is a schematic diagram of the two-section structure of the heat conversion unit of the plate heat exchanger of the present invention.

[0028] Figure 11 This is a three-dimensional schematic diagram of the liquid channel in the plate heat exchanger of the present invention, wherein the heat storage layer is a straight plate.

[0029] The annotations in the attached figures are explained as follows:

[0030] 1. Second exhaust pipe; 2. Second liquid inlet pipe; 3. Fourth steam outlet pipe; 4. Internal combustion engine exhaust waste heat extraction device; 5. First steam outlet pipe; 6. Fourth liquid inlet pipe; 7. Second steam outlet pipe; 8. Exhaust gas bend pipe; 9. Clamp; 10. First exhaust pipe; 11. First liquid inlet pipe; 12. Turbocharger; 13. Heat conversion unit; 14. Heat storage fins; 15. Liquid channel; 16. Heat storage layer; 17. Connecting bracket; 18. Liquid inlet channel; 19. Liquid outlet channel; 20. Second heat storage layer; 21. 1. First heat storage layer; 22. Connecting plate; 23. Liquid inlet; 24. Liquid outlet; 25. Liquid inlet hole; 26. Groove; 27. Upper partition shaft; 28. Lower partition shaft; 29. ​​High-temperature exhaust gas channel; 30. Water circulation channel; 31. Third liquid inlet pipe; 32. Third steam outlet pipe; 33. First heat exchange plate connector; 34. Second heat exchange plate connector; 35. Third heat storage layer; 37. Heat exchange plate connecting pipe; 38. First heat conversion unit; 39. Second heat conversion unit. Detailed Implementation

[0031] The overall solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0032] See Figure 1The structure of a specific embodiment of the present invention includes an internal combustion engine exhaust waste heat extraction device 4, a first exhaust pipe 10, an exhaust bend 8, and a second exhaust pipe 1. The internal combustion engine exhaust waste heat extraction device 4 is connected to the first exhaust pipe 10. The first exhaust pipe 10 is connected to the second exhaust pipe 1 through the exhaust bend 8. A first heat exchanger is provided inside the first exhaust pipe 10. The first heat exchanger is set inside the first exhaust pipe 10 through a first connecting bracket. A first steam outlet pipe 5 and a first liquid inlet pipe 11, which are connected to the first heat exchanger, are respectively provided at both ends of the first exhaust pipe 10. A second heat exchanger is provided inside the second exhaust pipe 1. The second heat exchanger is set inside the second exhaust pipe 1 through a second connecting bracket. A second liquid inlet pipe 2 and a second steam outlet pipe 7, which are connected to the second heat exchanger, are respectively provided at both ends of the second exhaust pipe 1.

[0033] The internal combustion engine exhaust waste heat extraction device 4 can adopt the internal combustion engine exhaust waste heat extraction device disclosed in Chinese Patent Publication No. CN207229214U. A heat exchanger is installed inside the exhaust manifold connected to the internal combustion engine, and a fourth steam outlet pipe 3 and a fourth liquid inlet pipe 6 connected to the heat exchanger are installed on the exhaust manifold. The high-temperature steam directly generated by the internal combustion engine exhaust waste heat extraction device 4 can be used for steaming rice.

[0034] A turbocharger 12 is connected between the internal combustion engine exhaust waste heat extraction device 4 and the first exhaust pipe 10, and the first exhaust pipe 10 and the exhaust bend 8 are connected by a clamp 9.

[0035] See Figure 2 Taking the second heat exchanger installed inside the second exhaust pipe 1 as an example, when the second heat exchanger is a cylindrical heat exchanger with a single-layer heat storage layer, its structure includes a heat storage layer 16, which is cylindrical. A liquid channel 15 is arranged around the heat storage layer 16. One end of the liquid channel 15 is provided with a liquid inlet 23, and the other end is provided with a liquid outlet 24. There are multiple heat conversion units 13. In this embodiment, there are four heat conversion units 13. The liquid outlet of the heat storage layer 16 of the preceding heat conversion unit is connected to the liquid inlet of the heat storage layer 16 of the following heat conversion unit. The liquid channel 15 is Z-shaped or S-shaped. Heat storage fins 14 are arranged circumferentially on the inner and outer surfaces of the heat storage layer 16. The heat exchanger is installed inside the second exhaust pipe 1 via a connecting bracket 17. One end of the second exhaust pipe 1 is provided with a second liquid inlet pipe 2, and the other end is provided with a second steam outlet pipe 7. In a preferred embodiment of the present invention, the second liquid inlet pipe 2 is disposed at the outlet end of the second exhaust pipe 1, and the second steam outlet pipe 7 is disposed at the inlet end of the second exhaust pipe 1. The second liquid inlet pipe is connected to the liquid inlet 23 of the heat storage layer 16 of the first heat conversion unit, and the second steam outlet pipe 7 is connected to the liquid outlet 24 of the heat storage layer 16 of the last heat conversion unit. In this embodiment, the liquid is water.

[0036] See Figure 3 , 4 The second heat exchanger of the present invention adopts a cylindrical heat exchanger, and in a specific embodiment with a double-layer heat storage layer, the structure includes a first heat storage layer 21 and a second heat storage layer 20. The second heat storage layer 20 is coaxially disposed inside the first heat storage layer 21. Both the first heat storage layer 21 and the second heat storage layer 20 are cylindrical. A liquid channel 15 is arranged around both the first heat storage layer 21 and the second heat storage layer 20. The liquid channel 15 is Z-shaped or S-shaped. A liquid inlet 23 is provided at one end of the liquid channel 15, and a liquid outlet 24 is provided at the other end. Heat storage fins 14 are arranged circumferentially on both the inner and outer surfaces of the first heat storage layer 21 and the second heat storage layer 20. The first heat storage layer 21 and the second heat storage layer 20 are connected by a connecting plate 22. The first heat storage layer 21 is provided with a liquid inlet hole 25. The connecting plate 22 is provided with a liquid inlet channel 18 and a liquid outlet channel 19. The liquid inlet hole 25 communicates with the liquid inlet 23 of the second heat storage layer 20 through the liquid inlet channel 18, and the liquid outlet 24 of the second heat storage layer 20 communicates with the liquid inlet 23 of the first heat storage layer 21 through the liquid outlet channel 19. There are multiple heat conversion units 13. In this embodiment, there are four heat conversion units 13. In two adjacent heat conversion units 13, the liquid outlet 24 of the first heat storage layer 21 of the preceding heat conversion unit communicates with the liquid inlet hole 25 of the first heat storage layer 21 of the following heat conversion unit, and so on, with the four heat conversion units 13 connected sequentially. The heat converter is installed inside the second exhaust pipe 1 via a connecting bracket 17. One end of the second exhaust pipe 1 is provided with a second liquid inlet pipe 2, and the other end is provided with a second steam outlet pipe 7. In a preferred embodiment of the present invention, the second liquid inlet pipe 2 is disposed at the outlet end of the second exhaust pipe 1, and the second steam outlet pipe 7 is disposed at the inlet end of the second exhaust pipe 1. The second liquid inlet pipe 2 is connected to the liquid inlet hole 25 of the first heat storage layer 21 of the first heat conversion unit, and the second steam outlet pipe 7 is connected to the liquid outlet 24 of the first heat storage layer 21 of the last heat conversion unit. In this embodiment, the liquid is water.

[0037] See Figure 5 When the liquid channel 15 of the second heat converter of the present invention is "Z" shaped, a groove 26 is arranged around the heat storage layer 16. An upper partition shaft 27 and a lower partition shaft 28 are arranged in the groove 26. The upper end of the upper partition shaft 27 is connected to the upper inner wall of the groove 26, and the lower end is separated from the lower inner wall of the groove 26. The lower end of the lower partition shaft 28 is connected to the lower inner wall of the groove 26, and the upper end is separated from the upper inner wall of the groove 26. There are multiple upper partition shafts 27 and lower partition shafts 28, which are arranged alternately to form a "Z" shaped liquid channel.

[0038] When the upper partition axis 27 and the lower partition axis 28 are corresponding arcs, an "S"-shaped liquid channel is formed.

[0039] See Figure 6The second heat exchanger of the present invention is a double-layer heat storage layer, with four heat exchange units 13. When the liquid is water, the liquid flow direction is as follows: cold water enters the first heat exchange unit through the second inlet pipe 2, first through the inlet hole 25 and inlet channel 18 of the first heat storage layer 21 of the first heat exchange unit, and then enters the liquid channel 15 of the second heat storage layer 20 for internal circulation. Then, it enters the liquid channel 15 of the first heat storage layer 21 from the liquid outlet 24 and outlet channel 19 of the second heat storage layer 20 for external circulation. Then, it enters the inlet hole 25 of the first heat storage layer 21 of the second heat exchanger from the liquid outlet 24 of the first heat storage layer 21, from internal circulation to external circulation, and so on, entering the third and fourth heat exchangers. Finally, hot water flows out from the liquid outlet 24 of the second heat storage layer 20 and the second steam outlet pipe 7 of the fourth heat exchanger, realizing step-by-step heating.

[0040] See Figure 7 The heat exchange process of the heat exchanger of the present invention is as follows: during the process of the engine exhaust gas being discharged from the second exhaust pipe 1, three high-temperature exhaust gas channels are formed between the outer wall of the first heat storage layer 21 and the inner wall of the second exhaust pipe 1, between the inner wall of the first heat storage layer 21 and the outer wall of the second heat storage layer 20, and within the second heat storage layer 20; the liquid channels 15 of the first heat storage layer 21 and the second heat storage layer 20 respectively form two water circulation channels. During the process of exhaust gas discharge, heat exchange is continuously performed with the water in the liquid channels 15, and the water in the liquid channels 15 is heated step by step.

[0041] The method of installing the first heat exchanger inside the first exhaust pipe 10 is the same as in the above embodiment.

[0042] See Figure 8 Taking a third heat exchanger installed inside the exhaust gas bend 8 as an example, the third heat exchanger is a plate-type heat exchanger, which includes a heat exchange unit 13. The heat exchange unit 13 is installed inside the exhaust gas bend 8 via a connecting bracket. A third liquid inlet pipe 31 is provided at one end of the exhaust gas bend 8, and a third steam outlet pipe 32 is provided at the other end. The heat exchange unit 13 includes a heat storage layer 16, which is plate-shaped. A liquid channel 15 is provided inside the heat storage layer 16. A liquid inlet 23 is provided at one end of the liquid channel 15, and a liquid outlet 24 is provided at the other end. The heat storage layer 16 can be a straight plate or an arc plate. The third liquid inlet pipe 31 is connected to the liquid inlet 23, and the liquid outlet 24 is connected to the third steam outlet pipe 32.

[0043] The heat storage layer can be a straight plate or a curved plate. In this embodiment, the liquid is water.

[0044] See Figure 9In a specific embodiment of the present invention, a third heat exchanger is provided inside the exhaust gas bend 8, and when the heat storage layer 16 is an arc-shaped panel, the heat storage layer 16 has three layers, including a first heat storage layer 21, a second heat storage layer 20, and a third heat storage layer 35. The second heat storage layer 20 is arranged parallel to the inside of the first heat storage layer 21. The first heat storage layer 21 and the second heat storage layer 20 are connected by a first heat exchange plate connector 33. A first liquid channel is provided inside the first heat exchange plate connector 33. The liquid outlet of the first heat storage layer 21 is connected to the liquid inlet of the second heat storage layer 20 through the liquid channel. The third heat storage layer 35 is arranged parallel to the inside of the second heat storage layer 20. The second heat storage layer 20 and the third heat storage layer 35 are connected by a second heat exchange plate connector 34. A second liquid channel is provided inside the second heat exchange plate connector 34. The liquid outlet of the second heat storage layer 20 is connected to the liquid inlet of the third heat storage layer 35 through the second liquid channel.

[0045] The liquid channel can be Z-shaped or S-shaped. When the liquid channel 15 is Z-shaped, a groove 26 is provided in the heat storage layer. An upper partition shaft 27 and a lower partition shaft 28 are provided in the groove 26. The upper end of the upper partition shaft 27 is connected to the upper inner wall of the groove 26, and the lower end is separated from the lower inner wall of the groove 26. The lower end of the lower partition shaft 28 is connected to the lower inner wall of the groove 26, and the upper end is separated from the upper inner wall of the groove 26. There are multiple upper partition shafts 27 and lower partition shafts 28, which are staggered to form a Z-shaped liquid channel.

[0046] When the upper partition axis 27 and the lower partition axis 28 are corresponding arcs, an "S"-shaped liquid channel is formed.

[0047] Heat storage fins 14 are provided on both the inner and outer surfaces of the heat storage layer 16. The heat storage fins 14 can increase the heat conversion area and further improve the heat conversion efficiency.

[0048] See Figure 10 There can be multiple heat conversion units 13. In this embodiment, the heat storage layer 16 of the third heat converter is an arc panel type, with three layers and two heat conversion units 13. The liquid outlet of the third heat storage layer of the first heat conversion unit is connected to the liquid inlet of the third heat storage layer of the second heat conversion unit through a heat exchange plate connecting pipe 37. The liquid flows in opposite directions in the first and second heat conversion units. The liquid flows from the third liquid inlet pipe 31 into the first heat storage layer of the first heat conversion unit, then flows through the second heat storage layer to the third heat storage layer, then through the heat exchange plate connecting pipe 37 to the third heat storage layer of the second heat conversion unit, then through the second heat storage layer to the first heat storage layer, and finally flows out through the third steam outlet pipe 32 of the second heat conversion unit.

[0049] If there are three heat conversion units 13, the liquid outlet of the third heat storage layer of the first heat conversion unit is connected to the liquid inlet of the third heat storage layer of the second heat conversion unit through a heat exchange plate connecting pipe; the liquid outlet of the first heat storage layer of the second heat conversion unit is connected to the liquid inlet of the first heat storage layer of the third heat conversion unit.

[0050] If there are multiple heat conversion units 13, the configuration shall be carried out in the same manner.

[0051] See Figure 11 In this embodiment, the heat storage layer 16 of the heat exchanger of the present invention is a straight plate type, and there are two heat exchange units 13. The liquid inlet of the first heat exchange unit 38 is at the top of the liquid channel 15, and the liquid outlet is at the bottom of the liquid channel 15. The liquid inlet of the second heat exchange unit 39 is at the bottom of the liquid channel 15, and the liquid outlet is at the top of the liquid channel 15. The liquid flow direction is as follows: the liquid enters the liquid inlet 23 of the first heat exchange unit 38 from the liquid inlet pipe, and flows downward through the liquid channel 15 to the liquid outlet 24 at the bottom; the liquid outlet 24 of the first heat exchange unit 38 is connected to the liquid inlet 23 at the bottom of the second heat exchange unit 39, and flows upward through the liquid channel 15 to the liquid outlet 24 at the top; and is discharged from the steam outlet pipe.

[0052] If there are three heat conversion units 13, the liquid outlet at the bottom of the first heat conversion unit is connected to the liquid inlet at the bottom of the second heat conversion unit; the liquid outlet at the top of the second heat conversion unit is connected to the liquid inlet at the top of the third heat conversion unit.

[0053] If there are multiple heat conversion units 13, the configuration shall be carried out in the same manner.

[0054] The heat exchange process of the present invention is as follows: During the process of engine exhaust gas being discharged from the exhaust pipe, four high-temperature exhaust gas channels are formed between the outer wall of the first heat storage layer 21 and the upper inner wall of the exhaust pipe, between the inner wall of the first heat storage layer 21 and the outer wall of the second heat storage layer 20, between the inner wall of the second heat storage layer 20 and the outer wall of the third heat storage layer 35, and between the inner wall of the third heat storage layer 35 and the lower inner wall of the exhaust pipe 2; the liquid channels 15 of the first heat storage layer 21, the second heat storage layer 20 and the third heat storage layer 35 respectively form three water circulation channels. During the exhaust gas discharge process, heat exchange is continuously performed with the water in the liquid channels 15, heating the water in the liquid channels 15, and finally forming water vapor, which is discharged from the steam outlet pipe.

[0055] The technical contents of this invention and those not specifically described in the above embodiments are the same as those in the prior art.

[0056] The above are merely specific embodiments disclosed in this invention, but the scope of protection disclosed in this invention is not limited thereto. The scope of protection disclosed in this invention should be determined by the scope of the claims.

Claims

1. A waste heat extraction device for diesel vehicle tailpipes, characterized in that: The diesel vehicle exhaust waste heat extraction device includes an internal combustion engine exhaust waste heat extraction device, a first exhaust pipe, an exhaust bend, and a second exhaust pipe. The internal combustion engine exhaust waste heat extraction device is connected to the first exhaust pipe, and the first exhaust pipe is connected to the second exhaust pipe through the exhaust bend. A first heat exchanger is installed inside the first exhaust pipe, and the first heat exchanger is installed inside the first exhaust pipe through a first connecting bracket. A first liquid inlet pipe and a first steam outlet pipe, which are connected to the first heat exchanger, are respectively installed at both ends of the first exhaust pipe. A second heat exchanger is installed inside the second exhaust pipe, and the second heat exchanger is installed inside the second exhaust pipe through a second connecting bracket. A second liquid inlet pipe and a second steam outlet pipe, which are connected to the second heat exchanger, are respectively installed at both ends of the second exhaust pipe.

2. The waste heat extraction device for diesel vehicle tailpipes according to claim 1, characterized in that: Both the first and second heat exchangers are cylindrical heat exchangers. Each cylindrical heat exchanger includes a heat exchange unit, which includes a heat storage layer. The heat storage layer is cylindrical, and a liquid channel is arranged around it. One end of the liquid channel is provided with a liquid inlet, and the other end is provided with a liquid outlet. There are multiple heat exchange units, and the liquid outlet of the heat storage layer of the preceding heat exchange unit is connected to the liquid inlet of the heat storage layer of the following heat exchange unit.

3. The diesel vehicle tailpipe waste heat extraction device according to claim 2, characterized in that: The heat storage layer consists of two layers, including a first heat storage layer and a second heat storage layer. The second heat storage layer is coaxially disposed inside the first heat storage layer. The first heat storage layer and the second heat storage layer are connected by a connecting plate. The first heat storage layer is provided with a liquid inlet hole. The connecting plate is provided with a liquid inlet channel and a liquid outlet channel. The liquid inlet hole is connected to the liquid inlet of the second heat storage layer through the liquid inlet channel. The liquid outlet of the first heat storage layer of the preceding heat conversion unit is connected to the liquid inlet hole of the first heat storage layer of the following heat conversion unit.

4. The diesel vehicle tailpipe waste heat extraction device according to claim 1, characterized in that: Both the first heat exchanger and the second heat exchanger are plate heat exchangers. The plate heat exchanger includes a heat conversion unit, and the heat conversion unit includes a heat storage layer. The heat storage layer is plate-shaped and has a liquid channel. One end of the liquid channel has a liquid inlet and the other end has a liquid outlet. The heat storage layer is a straight plate or an arc plate.

5. The diesel vehicle tailpipe waste heat extraction device according to claim 4, characterized in that: When the heat storage layer is an arc-shaped panel, it consists of three layers: a first heat storage layer, a second heat storage layer, and a third heat storage layer. The second heat storage layer is arranged parallel to the inner side of the first heat storage layer. The first and second heat storage layers are connected by a first heat exchange plate connector. A first liquid channel is provided within the first heat exchange plate connector. The liquid outlet of the first heat storage layer is connected to the liquid inlet of the second heat storage layer through the liquid channel. The third heat storage layer is arranged parallel to the inner side of the second heat storage layer. The second and third heat storage layers are connected by a second heat exchange plate connector. A second liquid channel is provided within the second heat exchange plate connector. The liquid outlet of the second heat storage layer is connected to the liquid inlet of the third heat storage layer through the second liquid channel. There are multiple heat conversion units. In two adjacent heat conversion units, the liquid outlet of the third heat storage layer of the preceding heat conversion unit is connected to the liquid inlet of the third heat storage layer of the following heat conversion unit through a heat exchange plate connecting pipe.

6. The diesel vehicle tailpipe waste heat extraction device according to claim 4, characterized in that: When the heat storage layer is a straight plate, there are multiple heat conversion units. In two adjacent heat conversion units, the liquid outlet of the heat storage layer of the preceding heat conversion unit is connected to the liquid inlet of the heat storage layer of the following heat conversion unit.

7. The diesel vehicle tailpipe waste heat extraction device according to claim 5, characterized in that: A third heat exchanger is installed inside the exhaust gas bend. The third heat exchanger is a plate heat exchanger with an arc panel-type heat storage layer. The third heat exchanger is installed inside the exhaust gas bend via a third connecting bracket. A third liquid inlet pipe and a third steam outlet pipe, which are connected to the third heat exchanger, are respectively installed at both ends of the exhaust gas bend.

8. The diesel vehicle tailpipe waste heat extraction device according to any one of claims 2 to 7, characterized in that: The liquid channel is Z-shaped or S-shaped.

9. The diesel vehicle tailpipe waste heat extraction device according to claim 8, characterized in that: When the liquid channel is "Z" shaped, a groove is arranged around the heat storage layer. An upper partition shaft and a lower partition shaft are arranged in the groove. The upper end of the upper partition shaft is connected to the upper inner wall of the groove, and the lower end is separated from the lower inner wall of the groove. The lower end of the lower partition shaft is connected to the lower inner wall of the groove, and the upper end is separated from the upper inner wall of the groove. There are multiple upper and lower partition shafts arranged alternately.

10. The waste heat extraction device for diesel vehicle tailpipes according to claim 9, characterized in that: The heat storage layer has heat storage fins arranged along its circumference on both its inner and outer surfaces.

Images